Std-190

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FOREWORD
The Oil Industry in India is more than 100 years old. Because of various collaboration
agreements, a variety of international codes, standards and practices have been in vogue.
Standardisation in design philosophies and operating and maintenance practices at a
national level was hardly in existence. This coupled with feed back from some serious
accidents that occurred in the recent past in India and abroad, emphasised the need for
the industry to review the existing state of art in designing, operating and maintaining oil
and gas installations.
With this in view, the Ministry of Petroleum and Natural Gas in 1986 constituted a Safety
Council assisted by the Oil Industry Safety Directorate(OISD) staffed from within the
industry in formulating and implementing a series of self regulatory measures aimed at
removing obsolescence, standardising and upgrading the existing standards to ensure
safe operations. Accordingly, OISD constituted a number of functional committees of
experts nominated from the industry to draw up standards and guidelines on various
subjects.
The present standard on " Derrick Floor Operation " (Onshore Drilling / Workover rigs)was
prepared by the Functional Committee on " Derrick Floor Operation” (Onshore Drilling /
Workover rigs) This document is based on the accumulated knowledge and experience of
industry members and the various national and international codes and practices.
This standard is meant to be used as supplement and not as a replacement for existing
codes and practices.
It is hoped that provisions of this standard if implemented objectively, may go a long way to
improve the safety and reduce accidents in Oil and Gas Industry. Users are cautioned that
no standard can be a substitute for the judgement of responsible and experienced
Engineers.
Suggestions are invited from the users after it is put into practice to improve the document
further. Suggestions for amendments to this document should be addressed to the
Coordinator, Committee on " Derrick Floor Operation” (Onshore Drilling / Workover rigs),

OIL INDUSTRY SAFETY DIRECTORATE
TH

7

FLOOR, NEW DELHI HOUSE
27, BARAKHAMBA ROAD
NEW DELHI - 110 001.

This standard in no way supercedes the statutory requirements of bodies like DGMS, CCE
or any other Government Body which must be followed as applicable.

2

3

COMMITTEE FOR
STANDARD ON
"DERRICK FLOOR OPERATION"
(ONSHORE DRILLING / WORKOVER RIGS)
----------------------------------------------------------------------------------------------------------------------NAME
DESIGNATION &
POSITION IN
ORGANISATION
COMMITTEE
-----------------------------------------------------------------------------------------------------------------------

1.

S/SHRI
D.BORKAKOTY

2.

OIL,
DULIAJAN

LEADER

RAM SHANKER

ONGC, IDT
DEHRADUN

MEMBER

3.

R.G.GOEL

ONGC, P&E
DEHRADUN

4.

P.K. JAIN

5.

KULBIR SINGH

ONGC,
MUMBAI
ONGC
AHMEDABAD

MEMBER

MEMBER

MEMBER

6. a
P.K. GARG
OISD
CO-ORDINATOR
b
JAYANT AHUJA
OISD
-----------------------------------------------------------------------------------------------------------------------

4

CONTENTS

SECTION

DESCRIPTION

PAGE

NO.
1.

INTRODUCTION

5

2.

SCOPE

5

3.

TOOLS AND ACCESSORIES FOR OPERATIONS

5

4.

PRE- SPUD / WORK OVER CONFERENCE

6

5.

GENERAL SAFETY PRECAUTION ON RIGS

6

6.

SAFETY PRECAUTONS IN DRILLING OPERATIONS

11

7.

SAFETY PRCAUTIONS DURING
PRODUCTION TESTING

14

8.

SAFETY PRECAUTIONS DURING
WORKOVER OPERATIONS

17

9.

INSPECTION AND MAINTENANCE SCHEDULE

18

10.

GLOSSARY

25

11.

REERENCES

26

12.

ANNEXURES

27

5

1.0

INTRODUCTION

Operational safety is the foremost
concern while working on Drilling / workover rig. Derrick floor is the center stage
of all the operations and it is most
susceptible
to
accidents.
Safety
precaution with utmost care is required to
be taken as per the prevailing regulation
and practice so that accidents can be
avoided. Due to advancement in
technology, number of equipment have
been developed over a period to cater
the need of smooth operation on derrick
floor. Various standards are required to
be referred to cover the variety of
equipment used for safe operation in oil
industry and became cumbersome at
times to refer for each equipment. Under
these circumstances, it was felt
necessary to have one safety standard
which would cover various safety aspects
related to Derrick floor operations.
2.0

SCOPE

This standard has been prepared
keeping in view to cover various
operations. Pre spud / work-over
conference is required to be conducted
before taking up drilling/ work-over
operation for all the rigs. The various
points to be checked during Pre spud /
Workover
conference
have
been
compiled as a checklist for the
convenience of field personnel .
This standard covers recommended
Inspection
schedule
of
various
equipment used on a derrick floor at the
drilling / work-over rigs specifying
frequency of inspection under various
categories.
Safe
practices
and
precautions required to be observed for
various operations have been dealt in
this standard.
3.0

EQUIPMENT TOOLS /
ACCESSORIES FOR
OPERATIONS AT DERRICK
FLOOR ON DRILLING /
WORKOVER RIG

3.1

Well Control System

1.
2.

Remote Control Panel for BOP
Trip Tank

3.
4.
5.
6.

Upper and lower Kelly cock
Inside BOP
Mud check valve
Remote
control
panel
for
choke(In case of wellhead
pressure rating of 10,000 psi and
above)

3.2

Handling Tools

1.

24.

Rotary tongs along with counter
weights & tong pull back
Drill pipe spinner
Kelly spinner
Air winch
Racking board air winch
Safety clamps for drill-collar
Waterline/Hose for cleaning
Derrick Floor
Racking finger of monkey board
Kelly saver sub
Bit breaker
Bail type lifting plug for Bits and
Tubular
Clamp on type casing thread
protector
Drill pipe wiper
Elevator balancing strap
Casing line spooler ( Guide)
Mud fill up hose for casing
Drill pipe protectors
Safety clamp with chain for
Rotary hose
Pup joints for handling slick drillcollars
Various sizes of substitutes
Elevators & Slips for all sizes of
drill pipes , drill collars and
casing pipes
Rotary hose
Rat hole digging device / Down
hole motor
Ezy Torque

3.3

Safety System

1.

Twin stop safety device (Crowno-matic and Floor-o-matic)
Fall prevention device on mast
ladder with safety belt
Emergency Escape Device for
Top-man
First aid Box with Stretcher and
Blanket
Fire bell / Siren
Emergency vehicle
Fire extinguishers

2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.

22.
23.

2.
3.
4.
5.
6.
7.

5

8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.

Flame proof portable hand lamp
/ Safety torch
Railing with toe board
Guards on all moving parts
Breathing apparatus (wherever
required)
Gas detector for hydrocarbon
gas & H2S gas ( If required)
Safety lines for Power Tongs
Rotary brake
Hoisting Brake lever with safety
chain
Emergency shutoff system for
Draw works
Safety chain for Inclined ramp(
To prevent fall of any person)
Safety belt for Top-man with lane
yard
Railing on stair case at mud
tank/walkways and derrick floor

3.4

Accessories

1.
2.

Drill pipe raft/platform
Communication system between
Top-man and driller
Wind direction indicator
Rain protection for driller
Bug blower
Mud bucket
Cellar pit cleaning pump
Pilot light on top of mast
Bit rack

3.
4.
5.
6.
7.
8.
9.
3.5
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12
13.

14.

Instrumentation on Driller’s
Console
Weight indicator
Pressure gauge on Driller’s
panel and on stand pipe
SPM gauges for mud pumps
RPM gauge for rotary table
Rotary torque meter
Tong line pull/gauge
Air pressure gauge
Trip tank volume indicator
Mud flow fill indicator
Mud volume totaliser for active
and reserve tanks
Emergency stop switch for draw
works
Mud pump-operating switches
Record-o-graph to record WOB,
SPM for two pumps, RPM,
Rotary torque, Pump pressure
and ROP.
Well Deviation measuring tool

15.

4.0

Emergency stop switch for Engines
( For Mobile and Work-over Rigs)
PRE-SPUD CONFERENCE

Pre-spud conference should be held
before spudding with the participation of
Rig In-charge, Mechanical Engineer,
Electrical Engineer, Chemist, Civil
Engineer, Rig building In-charge and
Safety Officer at well site and they should
confirm the compliance of safety norms
as per checklist placed as a Annexure I
The observation of the audit teams and
earlier recommendation (If any) must be
rectified before spuding in.
4.1

Pre-Work Over Conference

Pre work over conference should be held
prior to commencement of operation with
the participation
of Rig in-charge,
Mechanical
Engineer,
Electrical
Engineer, Chemist, Civil Engineer, and
Safety Officer at well site and they should
audit the compliance of safety norms as
per checklist placed as Annexure II
The observation of the audit
teams and earlier recommendation (If
any)
must
be
rectified
before
commencement of operation.

5.0

GENERAL SAFE PRACTICES
ON RIGS

5.1

General Safety Awareness

i.

ii.

iii.

iv.

Availability
and
display
of
instruction for the use and
maintenance of personal protective
equipment.
General safety education should
be imparted through periodical
safety
meetings,
company
publications and other educational
media like video etc. ( If possible)
Unsafe and potentially dangerous
conditions should be rectified and
reported immediately to the incharge for further suitable action.
The off-going shift in-charge shall
inform the oncoming in-charge for
any known special hazards on
ongoing work that may effect safety
of the crew and rig. Accordingly
brief note should also be recorded.

6

v.

Hazardous substances shall be
stored at proper place, in proper
containers and properly labeled.
vi. Employees required to handle or
use hazardous substances shall be
instructed regarding their safe
handling and use and are made
aware of the potential hazards and
personnel protection required.
vii. Smoking and naked light shall be
prohibited at or in the vicinity of
operations that constitute a fire
hazard. No person shall smoke or
carry naked light within 30-m radius
of a well. In cluster locations
prohibition should be enforced for
all operations. Locations should be
conspicuously posted with a sign,
“NO SMOKING OR NAKED
LIGHT” or equivalent.
viii. A provision for smoking is kept
at a safe distance.
ix. Field welding shall not be permitted
on tongs; elevators, bails or heattreated rig equipment.
x. At least one trained person should
always be present on derrick floor
even during shutdown period to
observe the well particularly when
BOP is not closed.
xi. Pipe threads should be cleaned
with a wire brush.
xii. Hand gloves should always be
used for working on Rig floor, while
handling of wire ropes and tubular.
5.2 House Keeping

vi.

vii.

5.3 Wearing Apparel
i.
ii.

iii.

iv.

v.
i.

ii.

iii.

iv.

v.

Work places and stairs with
handrails should be maintained
reasonably clean and free of
debris, mud, oil or stumbling
hazards.
Scrap, waste and rubbish shall
not be allowed to accumulate in
work places of access or egress.
Hazardous leaks should be
immediately stopped or spills
should be promptly cleaned up to
eliminate personnel slipping and
fire hazard.
If employees are required to
work in a cellar pit, it should be
kept reasonably clean of water,
oil or drilling fluid accumulation.
Loose materials that are not
required for use should not be
placed or left so as to

dangerously
obstruct
work
places and passage way.
All projecting sharp edges and
railing ends shall be properly
bend over to prevent possible
injury.
When placing equipment and tools
on or around the rig floor and
location, care should be taken to
leave egress routes open. Tools
and equipment should be
securely placed and stored in a
manner so that they may not fall.

vi.

vii.

viii.

Each person in the work area
should wear a safety helmet.
Safety shoes / gum-boots should
always be worn by employees
normally assigned to the work
area.
Employees
should
wear
protective gloves, protective
apron, or other protective
equipment, as appropriate.
Eyeglass, face shield or other
appropriate
eye
protection
equipment should be worn by
employees engaged in any work
in which there is a reasonable
probability of injury to the eyes
from flying objects, chemical, or
injurious light or heat, rays that
can be prevented by such
equipment.
Loose or poorly fitted clothing
should not be worn.
Employees should not wear
jewelry or other ornament
causing injury while in the work
area.
Employees with hair of such length
as to be a hazard in work areas
should keep it contained in a
suitable
manner
while
performing their duties.
Person entering high noise areas
should wear hearing protection
equipment.

5.4 Drilling Programme / Work
Plan

Over

Geo-technical order / drilling program
indicating comprehensive drilling policy,
casing
policy,
formations to be

7

encountered, expected bottom hole
pressure, temperature mud weight to be
used and any hole problem expected to
be encountered with reference to
neighboring wells should be made
available at well site. All the shift incharge shall be aware of the content of
such drilling / work-over plan. Similarly
Work-over plan indicating details of
operation to be carried out and well
history be made available at site.
5.5

Derrick Floor

i)

Derrick floor chequered plates
should be placed firmly and in
such a way that there should be
no gap between them.
Any opening like mouse hole etc.
in chequered plate should always
be protected to avoid injury to
person.
Plain and slippery
chequered plate should be
replaced immediately.
Grease, dirt or mud spillage on
the derrick floor be cleaned with
water jet or surfactant during and
after any operation on the floor.
Grease, dirt, mud also be
cleaned from the steps of
stairways/ladder
to
avoid
slipping.
Used cotton waste and all other
dirty substance be stored in the
dustbin.
Stands of tubular racked in the
derrick or mast should be rested
on wooden raft and properly
secured to prevent them from
falling.
Proper stopper arrangement like
steel chain shall also be provided
at the end of the ‘Vee’ to avoid
accidentally slipping of persons.
Guardrails of minimum 3 ft.
height should be installed on all
platforms / walkways which are
more than 4 ft. above the ground
level. Toe board of 6” shall be
provided in addition to handrail
on operation of floors / platforms
/ walkways.
A minimum of two (2) stair ways
with hand rails shall be installed
on drilling rigs to provide
alternate exits from the rig floor
to ground level when rig floor
height is six (6) feet or more.

ii)

iii)

iv)

v)

vi)

vii)

viii)

ix)

x)

Drill-pipe kept for connection at
inclined catwalk should be
properly secured to avoid
slipping of the same.

5.6

Drilling / Work-over Operation

i.

ii.

iii.

iv.

v.

vi.

vii.

5.7

At the beginning of every shift
,the instruments and controls at
Driller’s stand, draw works, mud
pump, casing line, cat-line, and
blowout preventer assembly etc.
shall be examined by the Shift in
charge and he shall satisfy
himself that these are in good
condition. In case of non
operational of any instrument be
recorded and corrective action
should be taken immediately.
The Shift in charge shall see that
no person remains in a position
of danger at or near the rotary
table when set in motion.
Tools or other materials shall not
be carried up or down a ladder
unless properly secured to the
body leaving both hands free for
climbing.
The casing line shall not be in
direct contact with any derrick
member.
When cementing, no person
shall be allowed on the rig floor
near the wellhead or near the
cementing equipment except
those actually engaged on the
operation.
All high-pressure pipes fitted with
flexible joints shall be suitably
anchored and pressure tested
before commencement of any
operation.
For further details on Work-over
and Cementing operation OISD
standard NO. 182 and 175
respectively may be referred.
Draw Works Inspection

A competent person shall examine
brakes and linkage of draw works once
at least in every shift. If any defect is
noticed during such examination, the
draw works shall not be used until such
defect is rectified.

8

5.8 Casing Slipping And Cut Off
Program

Record
of
maintained.

Casing line cut off and shifting should be
carried out as per the OISD standard no:
183, “ Care and Use of Wire Rope”

5.13

5.14

i.

5.10 Cathead and catline
ii.
i.

ii.

iii.

iv.

5.11

i.
ii.

iii.

5.12

Cathead operated manually shall
be equipped with a divider to
ensure separation of the first
wrap of wire line or rope.
The key seat and projecting key
on a cathead shall be covered
with a smooth thimble or plate.
When a cathead is in use, a
competent person shall be at the
controls and in the event of any
emergency
,
he
shall
immediately stop the rotation of
the cathead.
The operator of cathead shall
keep his operating area clear
and shall keep the portion of
catline not being used coiled or
spooled.

iii.

Tongs and its Counter
Weights
Both the tongs should be hanged
ready for its use.
The ends of tong safety lines shall
be secured with not less than
three nos. of “U” clamps .
Lines of tongs counter balance
weights shall be provided with
guards to prevent accidental
contact.

be

Safety belts and life line

i.

ii.

Instrumentation
System

/

Electrical

Shift In-charge should ensure in
every shift that all instruments are
in functional order.
Electrical Engineer of Rig should
ensure that earthing are done on
rigs as per the recommendation
of IS: 3043 code of Practice for
Electrical Earthing and the Indian
Electricity
Rules
1956
&
amendment thereon, if any.
Adequate
general
lighting
arrangement shall be provided
during working hours at the
following places, ensuring that
Flame proof lights are fitted on the
Mast & within 15 mtrs. of well.
a) Where
natural
lighting
is
insufficient
b) Derrick floor
c) Driller’s stand
d) Monkey board
e) Every engine and pump house
f) Derrick sub structure
near
blowout preventer controls
g) Every place where persons are
to work
h) Every means of escape , access
or egress

5.15

Emergency Escape Device

A competent person shall inspect every
part of Emergency escape device/
Braking system once at least every day.

inspection

Every person who works above the first
girt of the derrick shall be provided with
approved type of safety belt and lifeline
and shall use the same unless he is
otherwise protected against the danger
of falling from height.

5.9 BOP Accumulator Unit
Shift in-charge should ensure that BOP
accumulator unit is charged and
sufficient oil is filled in oil sump. BOP
assembly should be function & pressure
tested regularly and proper well control
practice shall be complied with in
accordance to OISD standard no. 174

such

Precautions during welding
No person other than a
competent welder duly authorised
in writing by the manager or
installation manager shall carry out
welding or cutting work requiring
use of flame or electric welding
apparatus.
No welding or cutting work shall
be undertaken by any welder in any
classified hazardous area unless a
written permit, called, “Hot work

9

permit”, in the form specified in the
Second Schedule is issued to the
welder by the Manager or
Installation manager. Copies of hot
work permits shall be entered in a
register and stored.
No welding or cutting work shall
be undertaken in hazardous area
unless the area is duly examined
and found gas-free by a competent
person authorised for the purpose.
A report of every such examination
shall be recorded in a bound-paged
book kept for the purpose and shall
be signed and dated by the person
making the examination.
During the welding and cutting
operation, the welder shall see
that:-

iii.

iv.

a.

b.

c.

d.

e.

f.

g.

All flammable material, oil, grease,
oil-soaked earth are removed from
the area;
No matches, lighters or smoking
apparatus or any other source
capable of igniting flammable gas is
present at or around his place of
work;
Adequate precautions are taken to
prevent fires being started by
sparks, slag or hot metal;
Adequate number of foam or dry
chemical type fire-extinguishers are
readily available for immediate use;
When operations are carried out in
confined
space,
adequate
ventilation by mechanical means is
constantly provided to prevent
accumulation of flammable gas;
When operations are carried out on
pipeline which contained flammable
fluid,
ensure
that
pipe
is
disconnected or blinded / the line is
isolated, drained and purged with
inert gas or water before hot work is
undertaken. Adequate precautions
are taken against build-up of
pressure in the line while hot work is
in progress;
The installation manager shall
ensure that where hot work permits
are issued welding and cutting
operations are carried out in
accordance with the said permits.

5.16

i.

ii.

iii.

5.17

Stacking
Ground

Of

Tubulars

On

All tubular should be identified
for size, grade and stacked on
racks properly at its designated
place without obstructing the
egress of heavy vehicles.
Discarded tubular should be
identified with color code, in
accordance with API R.P 7G/
API - 7 and should be kept
separately.
Pipe rack should be placed
properly on even surface and
should have proper stopper
arrangement to prevent rolling
back of tubular during loading
and off-loading.
Stock Of Barytes, Chemical
And Water

Sufficient quantity of Barytes, mud
chemical and water including proper,
infrastructure facilities for loading mud in
case of emergency well kick situation
should be available all the time during
operation of the rig. Work-over fluid as
per plan should be available at site in
adequate quantity to meet emergent
situation.
One high-pressure well killing pump /
cementing unit, while drilling wild cat /
high-pressure gas wells be placed at
suitable distance and hooked up for
killing well in emergency situation.

5.18

Environment Protection
Waste Management

And

The size and capacity of waste / effluent
pit should be designed as per the type of
the rig, depth of the well, climatic
condition of the area and quantity of
waste discharged during the operation of
the rig. Cutting pit should also be made
to collect well cuttings generated and pit
to be cleaned regularly.
Oil pit should be made at a suitable
distance to collect oil / condensate during
activation of well. Adequate care shall
also be taken so that in no case the
accumulated waste / effluent from the pit
shall overflow or seep outside. In such
case the excess amount of waste from

10

the pit shall be pumped out or be
transferred to any other central pit. It is
also very much essential to have proper
drainage around the well plinth with
proper gradient to collect and carry all
the waste from the rig area into the pit.
The wastewater collected in the pit may
be reused in the rig operation where
clear water is not necessary such as
mud preparation etc. It is very much
desirable to have a recycling system for
proper use of wastewater again and
again in well operation thereby reducing
accumulation of effluent in the waste pit.
There should be some provision for
mechanical / manual lifting of oil from
the waste pit, in case such a situation
occurs.

v.

vi.

vii.
viii.
ix.
x.

xi.
6.0

SAFETY PRECAUTIONS IN
DRILLING OPERATIONS

Safety plays an important role in all the
operations involved in drilling a well.
Given below are some of the critical
operations / stages which need to be
focussed upon for safe and efficient
completion of a healthy well, which are:

xii.
xiii.
xiv.
xv.
xvi.

i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
ix.
x.
xi.
xii.
xiii.
xiv.
xv.
xvi.
6.1

Prior to spudding of the well
During drilling operations
After drilling
Before round trip
During round trip
Before lowering casing
During lowering of casing
Prior to DST operation
After DST operating
during logging
During wire line operation
During fishing
During casing
During production testing
Preparation for cementation
During cementation
Ensure
availability
and
provision before spudding in
of the well

i.

GTO / drilling program with shift
In-charge
PPE for crew should be available
First aid box
Wash pipe should be greased
and after every 8 hours or as
specified by the manufacturer.

ii.
iii.
iv.

6.2
i.

ii.

iii.

iv.

v.

vi.

Kelly bushes to be greased after
every 24 hours or as specified by
the manufacturer
Lower & upper kelly cock ( Its
operating lever should be kept at
designated place at derrick floor)
Kelly saver sub on kelly
Mud check valve/ Full opening
safety valve
BOP control panel on derrick
floor
Before lowering casing, inspect
all the instruments such as
weight
indicator,
pressure
gauges, rotary torque,
SPM
counter, RPM counter mud
volume totaliser, flow meter &
trip tank.
Required No. of drill collars and
heavy weight D/Ps
Ensure availability of two mud
pumps in good working condition
Sketch of BHA to be made and
available with shift in-charge
Rat hole and mouse hole be
drilled
Twin stop safety device should
be made in working order
For other points, checklist placed
at Annexure 1 may also be
referred.
Safe Practices During Drilling
Penetration
rate
shall
be
monitored. In case of any drilling
break, stop rotary table, pull out
the kelly, stop mud pump and
check for self flow
Different type of drill pipes
should not be mixed up during
making up of the string
Protectors should be used on
drill pipes while lifting and laying
down the pipes on catwalk.
Drill pipe rubber protector should
be installed on drill pipes’ body
while being
used inside the
casing
Before starting drilling, hole
should be centered to avoid
touching of kelly with casing/
wellhead and Ensure that no
damage is done to well head
and BOP.
Continuous monitoring of the
gain / loss of mud during drilling

11

vii.

BOP mock drill
should be
carried as per OISD STD174
during
drilling / tripping and
under mentioned operations.

xxiv.
xxv.
xxvi.

6.3

Before Round Trip

Before commencing round trip the
following precautions should be taken:

xxvii.
xxviii.

i.
ii.
iii.
iv.

v.
vi.

vii.
viii.

ix.
x.
xi.
xii.

xiii.
xiv.

xv.
xvi.
xvii.
xviii.
xix.
xx.
xxi.
xxii.

xxiii.

Condition the mud for minimum
one cycle
Pump slug to avoid wet pulling
Check tong, jerk line and keep
these ready
Elevator and rotary slips for drill
pipes, drill collars checked and
greased
Install mud bucket
Full opening safety valve to be
checked and keep these in
hanging position so that it can be
installed in a minimum possible
time.
Topman should inspect safety
belt
Trip tank should be functional
and ensure that hole is filled at
regular interval and trip sheet is
being maintained.
Check functions of all gauges
prior to pullout
Safety clamp for drill collar to be
inspected
Arrange thread dope
Personnel protective equipment
like hand gloves, helmets, shoe
etc to be made available
Drill pipe wiper to be made
available
Ensure
availability
of
recommended air pressure for
pneumatic clutches.
Check and adjust brake lever
Visually inspect casing line, dead
end anchor and fast end
Ensure proper functioning of twin
stop safety device
Check auxiliary brake
Ensure availability of trip sheet
and actual / theoretical data
Recordograph to be checked
Ensure availability of water for
cleaning the derrick floor
Availability of flame proof hand
lamp and safety torch during
night
Check and fill oil in Ezy torque tank

xxix.

Availability of lifting sub and
cleaning of the same
Ensure proper functioning of
auxiliary brakes before tripping in
Condition of planks of pipe raft to
be checked and broken planks to
be
replaced
Bit breaker, Master bush’s lifter
availability to be checked
Before pulling out, check for any
self flow
Back up lines of rotary tongs
should not be anchored around
sharp edges to
avoid damage of
wire.

6.4

During pulling out & running in

i.

Working joints of drill string to
be changed in each trip
Pulling out should be carried out
in control speed to avoid
swabbing
First five stands from bottom
should be pulled out by the shift
in-charge himself with all carekeeping hole full of mud.
Compare actual hole fill up
volume with theoretical volume
for any corrective action, if
required.
Recheck for self flow at casing
shoe and before pulling out drill
collars
String should not be kept
stationary
in open hole for
prolong period to avoid sticking
of drill string.
During
running
in
break
circulation inside casing shoe in
case of deep wells particularly
when high-density mud is used.
While recovering / retrieving fish
it must be ensured that Rotary
table is not used for spinning out
the drill pipes.
Rig Chemist should monitor
regularly for self flow during
pulling out operation
Extra pull on drill string while
working in tight hole should be
maintained as advised by the
DIC, keeping in view the safe
limit of the drill string.
During round trip, tool joint shall
be kept at minimum height

ii.

iii.

iv.

v.

vi.

vii.

viii.

ix.

x.

xi.

12

xii.
xiii.

xiv.

xv.

xvi.

6.5

above the rotary table to avoid
bending while cracking the joint.
Use both the rotary tongs for
cracking joints.
Shift in-charge should be aware
of the grade, class of the drill
pipe being used & its strength .
Hook lock should be disengaged
during round tripping in open
hole.
Safety clamp should be used
while making and breaking of
drill collars.
Crew shouldl be away from the
vicinity of backup and jerk line
while using power tongs.
Precautions during Lowering of
Casing

should be used . studs/ Bolts
should be tightened at a proper
torque.
6.7 Fishing
Before taking up any fishing job, hoisting
equipment, casing line, strength of
tubular, rotary chain drives, components
of drill string, braking system, functioning
of control panel etc. be checked for its
normal functioning.
6.8 During logging
OISD standard no. 183 may be referred.

6.9 Prior to Drill Stem Testing
i.

ii.

iii.
iv.
v.

vi.
vii.

viii.

Ensure that capacity, condition of
rig and tackle system is sufficient
to handle the casing load.
Casing
pipes
should
be
thoroughly cleaned & gauged
and tally sheet be prepared
Inspect braking system
Check all handling tools required
for lowering of casing
Close blind Ram and replace
pipe Ram corresponding to the
casing pipe being lowered
Functioning of NRV of float shoe
and float collar be checked
Due care should be taken while
lifting casing pipes from pipe
racks to derrick floor.
Casing should be filled regularly
in case conventional type floating
equipment are being used

6.6 Well Head Fitting
i.

ii.

iii.

Casing should be cut at an
appropriate height to accommodate
the well head, and BOP assembly,
facilitating the connection to choke
& kill manifold.
Casing head housing, the first well
head component to be installed on
a conventional well should be
checked by spirit level for proper
leveling prior to welding, in case
weld on type casing head is being
used.
While fitting of section of well head
and BOP component, new ring
gasket of proper size & rating

i.

ii.

iii.

iv.
v.
vi.

vii.
viii.

ix.

x.

xi.
xii.

Detailed program should be
made / chalked out and
responsibilities be assigned to
concerned persons prior to
carrying out DST.
Function test of BOP must be
conducted before carrying out
DST.
No engine should be run within
100 ft. of the well without having
a spark arrestor and asbestos
insulation on the engine exhaust.
Keep available fire fighting
equipment.
Entry of unauthorised person at
the well site should be restricted.
Drilling fluid density and viscosity
should
be
checked
and
maintained within specified limits
before running in DST tools.
Trip tank should be made
operational.
DST manifold on the rig floor
should be anchored properly with
chains.
One or more reversing valves
shall be incorporated in the test
tool assembly.
Ensure that the separator safety
valve is in good working
conditions.
The Rotary hose should not be
used as a part of test lines.
A Full opening safety valve of
proper rating should be available
in
hanging
position
for
emergency use.

13

xiii.

xiv.

xv.

6.10
i.

ii.

iii.

iv.

v.

vi.

vii.

viii.

ix.

Test line laid down to the reserve
pit should be properly anchored
at every 9-meter interval.
Precautions should be taken as
per API 49 standard in case of
H2S is encountered.
Test string should be designed
as per anticipated bottom hole
pressure.
During DST Operation
High-density mud should be
stored in reserve tank for killing
the well in case of emergency.
Fluid volume in the casing
should be monitored while going
in and coming out of the hole to
ensure the well to be under
hydrostatic control.
The derrick floor should not be
left unattended during the drill
stem testing.
The mud box should be hooked
up and ready for use before the
drill stem tool is pulled out of the
hole.
DST packer should be set during
daytime. The DST tool should
not be pulled out of the hole after
dark unless all test fluids have
been pumped out of the test
string.
The fluid level in the annulus
should be checked regularly
throughout the test and ensure
that packer is holding and gas is
not leaking into the annulus from
test string.
Test string should not be rotated
during running in or pulling out.
String to be made up or opened
with the help of pipe spinner to
avoid rotation of Rotary table.
Reverse circulation should be
established in all DST operation
after completion of the test. In
case reverse circulation is not
established, annulus should be
watched frequently and fire
tender should be made available
as standby.
Drill string should not be pulled
out after DST, unless the well is
properly killed.

6.11 Cementing

OISD standard no. 175 may be referred.

7.0 SAFETY PRECAUTIONS DURING
PRODUCTION TESTING
7.1 Precautions during Perforation
The following recommendations provide
guidance for fire and other hazards
during perforation:
a) Explosives used in well
perforation shall be transported
in suitable containers.
b) No person other than a
competent person authorised for
the purpose shall handle,
transport and use explosives
meant for well- perforation
Well perforation operation shall be
carried out under the direct personnel
supervision of the official authorized for
the purpose.
Before commencement of perforation
operation, the official shall see that:
i.
The well is adequately filled with
mud / work-over fluid so as to
keep bottom hole pressure under
control.
ii.
The
blow
out
preventer
assembly is pressure and
function tested.
iii.
The perforation gun can be
safely lowered down the well.
iv.
A lubricator and wire line blowout
preventer are provided at the
wellhead
while
perforating
through tubing.
v.
All equipment including drilling or
work-over rig, pipe rack and
cabin used for perforation are
efficiently earthed, electrical
bonding is established between
equipment and wellhead before
connecting
up
explosive
charges.
vi.
Well perforation shall not be
carried out during night hours or
under conditions of lightening,
thunder, high winds and heavy
rains.
vii.
Normal work at the well shall not
be resumed until firing of the
charge has been completed and
the official has removed the
perforation equipment from the
site.

14

viii.

Adequate fire fighting equipment
should be readily available at site
for the whole period while well
perforation operations are in
progress.

a)

7.2 Air and nitrogen injection
b)
In this operation the main hazards are
blow out and fire in case of compressed
air injection, once the well comes in, the
compressor is stopped and prevailing
pressure is reduced through a bean to
induce formation fluids into the well. The
following precautions are recommended:
7.2.1 General precautions
The compressor and its supply line
should be provided with the following
equipment:
i.
A pressure gauge, to indicate the
pressure at each stage of
compression.
ii.
A self-recording pressure gauge,
at the final stage of compression,
to indicate if back-pressure from
the well is acting against the
compressor.
iii.
A pressure release safety valve
should be installed directly on the
outlet of
each stage of
compression of the compressor.
iv.
A device to automatically switch
off the compressor if the
temperature
or
pressure
exceeds the permissible limit or
if the pressure of the lubricating
system falls below the prescribed
limit.
v.
An air filter protected with wire
net should be installed on the
suction line at a height of 2.5
meters above ground level.
vi.
The discharge line of the
compressor should be provided
with a gate valve and also a nonreturn valve on upstream side to
prevent back flow of fluids from
the well into the compressor. A
pressure gauge should also be
provided on the discharge line.
The line should be securely
anchored to the ground.
vii.
Before
commencement
of
operation, it should be ensured
that:

c)

viii.

ix.

x.

The safety valve of the
compressor is in good working
order and it should be set it to
open at a pressure not
exceeding 10% of the maximum
allowable working pressure.
The
intermediate
coolers,
drainers and the air cleaner on
the high-pressure line are clean.
The discharge pipeline should be
pressure tested to 1-1/2 times
the working pressure. The joints
and hammer union should not be
opened or tightened unless the
pressure in the line is released.
During the operation, a close
watch should be maintained at
the pit or tank for fluids flowing
out of the well. If there is any
indication of flow of fluids, the
compressor should be stopped
and the well should be allowed to
flow through a proper choke to
ensure controlled flow of fluids.
If the bean is to be changed, the
pressure in the line should be
released through the bleeding
valve.
The annulus pressure should be
reduced gradually through a
bean otherwise a large volume of
formation fluid may enter the well
and gush out of it.
In case of any interruption in
injection of compressed air, the
well
should
be
closed
immediately.

7.2.2 Precautions against fire
i.

ii.

iii.

The compressors should be
located at a distance not less
than 30 meters from the
wellhead on the upwind side
preferably.
An area within 30 meters of the
wellhead should be treated as
danger zone in which no
smoking or open flame should
be permitted and all electrical
equipment
should
be
deenergized.
Adequate arrangements for fire
fighting should be made.

15

7.2.3 Precautions during handling of
nitrogen
vii.
i.

ii.

iii.

iv.

Liquid nitrogen is stored at (-)
0
195 C and requires extreme
care in handling it.
The relief valve on the storage
tank should be checked regularly
to ensure that it is in good
working order.
Frosted line
should not be touched with bare
hand.
Any cutting / welding or repair on
the outer surface of the nitrogen
tank should be undertaken only
after obtaining authorisation in
writing from the competent
authority.
Persons engaged in handling
liquid
nitrogen
should
be
imparted clear instructions in
safe handling of nitrogen and it
should be ensured that they
understand the same.

viii.

7.4
i.

7.3 TESTING OF WELLS
ii.
The main hazard in the operation is due
to fire as gas and oil flow through the
well and the following precautions are
therefore recommended:
i.

ii.

iii.

iv.

v.

vi.

The separator should be located
at a distance of not less than 15
mtrs. from the well head.
The measuring pipeline should
be at-least 6 mtrs. long with a
diameter not less than that of the
valve of the x-mas tree. The
pipeline should be laid straight
without any bends.
The open pit and flare should be
located at a distance not less
than 30 meters from the well
head.
The safety of the separator
should be checked to ensure
that it is in a good working order.
An area within 30 mtrs of the well
should be marked as danger
zone with
proper warning
signs at prominent places.
In the danger zone, no smoking
or open flame should be
permitted; entry of un-authorised
persons should be checked and

iii.

iv.

7.5
i.

ii.

iii.

iv.

v.

all electrical equipment should
be de-energised.
Adequate
fire
fighting
arrangements should be made.
It should be ensured that
persons deployed for well testing
are conversant with the use of
fire extinguishers.
Before the gate valve of the well
is opened, all persons should be
informed about operation &
safety procedures to adopt in
case of fire or uncontrolled flow.
The valve should be opened
fully; otherwise it may be
damaged due to throttling and
may leak thereafter.
Swabbing
While swabbing operation are
being conducted, all engines,
motors and any other possible
sources of ignition not essential
to the operation should be shut
down.
Swabbing line should be packed
off as the fluids are routed
through a closed system
Swabbing operation should be
conducted preferably during
daylight hours.
The swabbing unit should be
positioned upwind of any swab
tanks or pit, if feasible.
Acidizing
Acidizing operation at a well
should be carried out under the
direct personal supervision of an
official
authorized
for
the
purpose.
Prior to acidizing operation all
pressure lines and associated
equipment shall be tested to a
pressure one and half times the
expected working pressure.
A non-return valve shall be
installed in the treating line as
close to the well head as
practicable.
No person other than those
required for acidizing operation
remain in the vicinity of well.
Every person handling acid is
provided
with
and
uses

16

vi.

8.0

protective outer clothing, gloves
and footwear.
An adequate quantity of lime is
readily available and used to
neutralize any acid spilled.
SAFETY
DURING
OPERATIONS

PRECAUTIONS
WORKOVER

Work-over operations are carried out on
wells after initial completion for purpose
of maintaining , restoring or increasing
the productivity of well. Well work-over
operations should be aimed at protection
against harm, damage to human ,

coastal, marine environment , property
and natural resource.
During work-over operations following
jobs may be required to be
performed:i. Rig building / dismantling onshore
mobile rigs
ii. Well subduing
iii. Perforation and logging
iv. Running in / pulling out of tubular
v. Cementing
vi. Well stimulation
vii. Well activation/ well testing
Detailed guidelines on each of the
jobs are given in OISD standard 182,
accordingly same may be referred.

17

9.0

INSPECTION AND MAINTENANCE SCHEDULE

Equipment

Daily

Wee
kly

Travelling Block, Hook Block
& block to hook adapter
Connectors & link adopters
Elevator Links
Elevators (Casing, drill pipe,
Drill collars and Tubing
Swivel boil adopters
Rotary swivel
Power swivel
Spider Elevator
Dead line tie down / wire line
anchors
Kelly spinners
Power subs
Sucker rod elevators
Twin stop safety device
(Crown-o-matic and Floor-omatic)
Emergency Escape Device
Rotary Tong
Pipe Spinner
Air winch
Safety belt
Safety clamp
Kelly bushing
Railing
Stairs
Crown Block
Mast/Derrick
Instrumentation
BOP Remote Control Panel
Trip Tank
Upper and lower Kelly cock
Inside BOP
Mud check valve
Racking finger of monkey
board
Kelly saver sub

I

Annu
ally

Other
Frequency

II

III

IV (5 years)

I
I
II

II

III
III
III

IV (5 years)
IV (5 years)
IV (2 years)

I
I
I
II
I

II
II
II

III
III
III
III
III

IV (5 years)
IV (5 years)
IV (5 years)
IV (5 years)
IV (5 years)

I
I
II
I

II
II

IV (5 years)
IV (5 years)

II

III
III
III
III

I
II
I
I
II
I
II

II
II
II

III
III
III

IV (2 years)

II

II

III

I
I
II
I
I
I
I
I
I

I

IV ( 3 years)

II
II
II
II
II (*)

IV (5 years)
IV (5 years)

II
II
II

IV
IV
IV

II

IV

Annu
ally

Other
Frequency

II
II (*)
II
II
II
I

II

II

Bit breaker
Bail type lifting plug for Bits
and Tubular
Safety clamp with chain for
Rotary hose
Equipment

Semi
Annu
ally

II
I
I
Daily

Wee
kly

Semi
Annu
ally

18

Pup joints for handling slick
drill-collars
Elevators & Slips for all sizes
of drill pipes , drill collars and
casing pipes
Rat hole digging device( For
Drilling Rig)

I

II

II

III

II

Railing having toe board
Guards on all moving parts
Breathing apparatus
Gas detector
Communication system
between Topman and driller

I
I
I
I

II

Cellar pit cleaning pump
Ezy torque

I
I

II

III

IV

(*) Or covering Rig building whichever earlier
Category I :
Observation
of
equipment
during
operations
for
indications of inadequate performance.
Category II : Category I inspection,
plus Further inspection for corrosion,
deformation,
loose
or
missing
component,
deterioration,
proper
lubrication, visible external cracks and
adjustment.
Category III : Category II inspection
plus, further the inspection which should
include NDT of expired critical areas and
may involve some disassembly to access
specific components and identify wear
that
exceeds
the
manufacturers
allowable tolerance.
Category IV : Category III inspection
plus, Further inspection where the
equipment is disassembled to the extent
necessary to conduct NDT of all primary
load carrying components as defined by
the manufacturer.

which does not need acceptance criteria,
should not be accepted for operation
even at reduced load unless an analysis
is made in accordance with the
governing API / relevant Equipment
Specification.
Rejected equipment should be
marked with color visible code and
removed from service for further
evaluation or until deficiencies are
corrected.
Records:
i.
Record of category II be made in
Daily Progress Report
ii.
Record of category III and
Category IV inspection should be
entered in the equipment record.
iii.
Testing related to or indicating
the load carrying capacity of the
equipment and All repairs activity
should be entered in the
equipment record.
9.1

The periodicity of category III & IV as
indicated above may be advanced by
user keeping in view the various factors
e.g. Manufacturer ‘s recommendation,
environment, load cycle, regulatory
requirement, operating time, repairs and
re-manufacturing.
Result of Inspection: Acceptance
criteria should be established based on
experience
and
manufacturer’s
recommendations. Worn equipment,

Maintenance Procedure
Critical Items / Equipment

For

9.1.1 Kelly Drive Bushing
Lubrication to reduce wear is the
most
important
aspect
of
maintenance. This should be
done on a daily basis.
ii.
Certain adjustment can be made
on some two plans Roller
bushings to compensate for
normal wear. In this type of
bushings for a hex. Kelly, roller
i.

19

cages set on a stack of shims in
the drive bushing body. The
number
of
shims
used
determines the position of the
roller cages on mating tapers
between the cages and the
bushing body. Each set of shims
added or removed changes the
working diameter of the kelly
bushing by 1/32 of an inch.
Accordingly it should be checked
regularly.

and insert slot, the slip should be
replaced, as it will have danger
of loosing the inserts down the
hole.
9.1.4 Drill Collar / Casing Slips
Examine slips for general condition and
size range for the collars being run. Look
for cracks, missing cotter keys, loose
liners, dull liner teeth, bent back tapers
(from catching on drill collar shoulder)
and bent handles.

9.1.2 Master Bushing
Much can be done to prevent cutting,
gauging and bottlenecking of drill pipe by
proper maintenance of master bushing
and rotary slips.
This should be
lubricated on regular basis.
9.1.3 Drill Pipe / Tubing slips
The right size slips must always be used
for the size of pipe being handled. Slips
that are smaller than the pipe will
damage the pipe and the corners of slips
as well as risks of dropping a drill string.
Slips that are too large will not contact
the pipe all the way around. This risks of
dropping the pipe and destroys the
center part of the slip’s gripping surface.
9.1.3.1 Inspection of Drill Pipe/ Tubing
Slips
i.

ii.

iii.

iv.

It should be physically inspected
before every trip. If the inserts
are not secure ,remove the slips
from service until/ it is repaired.
If cracks are detected in the slip
bodies they should be removed
from service and marked to
prevent further use.
The back of the slips should be
straight
and
smooth.
Excessively worn slips should be
replaced.
MPI or similar method of
inspection should be made to
detect fatigue cracking in the slip
bodies, heels and toes of the
slips.
Check the insert’s slots for
damage or excessive wear. If
there is 1/8” to 3/16” clearance
between the back of the inserts

9.1.4.1 Inspection
Casing Slip

of

Drill

Collar/

Same as of Drill pipe slip
9.1.5 Drill Collar Safety Clamps
Safety clamps are used on drill collars
above the slips to prevent dropping the
string, when the slips fail to hold.
Examine safety clamp for cracks,
missing cotter keys, galled or stripped
threads, rounded off nuts or wrenches,
dull teeth, broken slip springs, and slips
that do not move up and down easily.
9.1.6 Elevator Links, Block, Hook and
Swivel Specification
i.

ii.

iii.

iv.

v.

Rating change due to wear of
links.
Based
on
recommendations on links, it is
possible to approximate downrate due to wear.
A periodic check should be
made
of
worn diameters,
particularly when weight levels
may be involved.
Experience has shown that the
greatest amount of wear on the
hook is on the link ears. Thus
down grading of the hook will be
based on wear at these points.
To determine the strength of
worn
links,
measure
with
calipers, the amount of eye wear
and compare figure with total for
new capacity.(Refer API spec.
8A)
Measure the depth of the links
ear at the point of the greatest
wear. The new capacity of the
hook and or link ears is shown in

20

the chart of hook size. .(Refer
API spec. 8A)
It is recommended that any hook
showing wear of 1/2” be promptly
repaired. Wear should never
exceed 3/4” when properly built
up to recommended dimension;
the wear pad will prevent further
loss in capacity until original
wear point is reached. The load
capacity will always be that of
greatest wear.

vi.

be checked for sharp dies and the
slip
segments,
removed
for
cleaning and lubrication.
9.1.7 Inspection
i.

9.1.7 Drill Pipe / Tubing/ Casing
Elevators
i.

ii.

Elevators that show hammer marks
around the top of the bore should
be closely examined to determine
whether it is the elevator, the tool
joint, or if both are at fault.
Although the taper may appear to
o
be true (18 ) the entire load-bearing
surface should be checked for
variations.

All elevators should be examined to
determine if the latch and the latch
lock mechanism are functioning
properly.
Hinge pins, latch lug
surfaces and link contact surfaces
should be lubricated. Slip type
casing and tubing elevators should

ii.

Square shoulder collar type:
Inspect the collars for squareness and uniformity and depth of
wear. Uneven wear, or worn
recess of 1/16 inch or more,
requires re-facing of collar
surface. Hinge pins and spring
should be carefully inspected
visually for excess wear and
obvious weakness. The standard
dimensions are given in ongoing
pages.
0
18
taper type elevators;
Inspection is same as per square
shoulder, except that the conical
bore should be observed and
measured. All tool joints used
with these elevators should also
be checked. Amount of wear
should
be
checked
with
standard dimension of Table 1.
In addition to the angle of taper,
hard banding should be checked
to see if it extends beyond the
taper. Any straight edge may be
used for this purpose.

TABLE 1 DRILL PIPE ELEVATOR BORES

Tool Joint
Designati
on

Drillpipe
Size and
style

Elev.
Marking

2 3/8 EU

Weld- On Tool Joints
Taper shoulder
Square Shoulder
Neck Dia. Elev.
Neck Dia. Elev.
Max.(mm) Bore(mm) Max.(mm) Bore(mm)
65.09
67.47

NC-26
( 2 3/8 IF)
NC-31
( 2 7/8 IF)
NC-38
( 3 1/2 IF)

2 7/8 EU

80.96

83.34

80.96

87.34

2 7/8 EU

3 1/2 EU

98.43

100.81

98.43

103.19

3 1/2 EU

NC-40
( 4 FH)
NC-46
( 4 IF)

3 1/2 EU

98.43

100.81

98.43

103.19

3 1/2 EU

4 EU
4 ½ EU
4 ½ IEU

114.30
119.06
119.06

121.44
121.44
121.44

114.30
117.48
117.48

122.24
122.24
122.24

4 EU
4 1/2 EU

2 3/8 EU

21

Tool Joint
Designati
on
4 ½ FH
NC 50
4 ½ IF
5 ½ FH
5 ½ FH
6 5/8 FH

Drillpipe
Size and
style
4 ½ IU
4 ½ IEU
4 ½ EU
5 IEU
5 IEU
5 IEU
6 5/8 IEU

Weld- On Tool Joints

119.06
119.06
127.00
130.18
130.18
144.46
175.02

121.44
121.44
133.35
133.35
133.35
147.64
178.66

117.48
117.48
127.00
130.18
130.18
144.46

Elev.
Marking
122.24
122.24
134.94
134.94
134.94
149.23

4 1/2 IEU
4 1/2 EU
5 IEU
5 IEU
5 ½ IEU
6 5/8

TABLE 2 CASING ELEVATOR BORES
Casing


5

6 5/8
7
7

114.30
127.00
139.70
168.28

Elevator Bores
Top Bore
Bottom Bore
In.(+/-1/64)
mm. (=/-.40) In.(+1/32,
mm.(+.79,
-1 /64)
-.40)
4.594
116.69
4.504
116.69
5.125
130.18
5.125
130.18
5.625
142.88
5.625
142.88
6.750
171.45
6.750
171.45

177.80

7.125

7 5/8

8 5/8
9 5/8
10 ¾
11 ¾
13 3/8
18
18 5/8
20

193.68
196.85
219.08
244.48
278.05
298.45
339.73
406.4
478.08
508.00

In.

mm.

180.98

7.125

180.98

7.781
197.64
7.781
7.906
200.81
7.908
8.781
223.04
8.781
9.781
248.44
9.781
10.938
277.88
10.938
11.938
303.23
11.938
13.563
344.5
13.582
16.219
411.96
16.219
18.875
479.48
18.875
20.281
515.14
20.281
TABLE 3 a TUBING ELEVATOR BORES

Tubing”D”

Non Upset Tubing
Top Bore”TB”
In.
mm.
(+/-1/64) (=/-.40)

197.64
200.81
223.04
248.44
277.88
303.23
344.5
411.96
479.48
515.14

In.

mm.

Collar Dia.”W”
In.
Mm.

1.050
1.315
1.66
1.900
2 3/8
2 7/8


26.67
33.40
42.16
48.26
60.32
73.03
88.9

1.313
1.66
2.054
2.200
2.875
3.500
4.250

33.35
42.16
52.17
65.88
73.03
88.90
107.95

1.125
1.390
1.734
1.984
2.453
2.953
3.678

28.58
35.31
44.04
60.39
62.31
75.01
90.88

Bottom Bore”BB”
In.(+1/32 mm.
,-1 /64)
(+.79,
-.40)
1.125
28.58
1.390
35.31
1.734
44.04
1.984
60.39
2.453
62.31
2.953
75.01
3.678
90.88

4
4 1/2

101.60
114.30

4.750
5.200

120.65
132.08

4.078
4.593

103.58
116.69

4.078
4.593

103.58
116.69

22

TABLE 3 b TUBING ELEVATOR BORES
Tubing
“D”

Collar Dia.”W”

In.

mm.

In.

mm.

1.050
1.315
1.66
1.900
2 3/8
2 7/8

4
4 1/2

26.67
33.40
42.16
48.26
60.32
73.03
88.9
101.60
114.30

1.680
1.900
2.200
2.500
3.063
3.666
4.500
5.000
5.583

42.16
48.26
55.88
63.50
77.80
98.17
114.30
127.00
141.30

External Upset Tubing
Upset Dia
Top Bore”TB”
“D4”
In.
mm.
In.
mm.
(+/(=/-.40)
1/64)
1.315 33.40
1.422
36.12
1.489 37.31
1.578
40.08
1.812 46.02
1.922
48.82
2.093 55.70
2.203
56.03
2.593 65.89
2.703
68.58
3.093 78.56
3.203
81.36
3.750 96.25
3.859
98.02
4.250 107.95 4.359
110.74
4.750 120.65 4.859
123.44

Bottom Bore”BB”
In.(+1/32,
-1 /64)

mm.
(+.79,
-.40)
36.12
40.08
48.82
56.03
68.58
81.36
98.02
110.74
123.44

1.422
1.578
1.922
2.203
2.703
3.203
3.859
4.359
4.859

9.1.8 Drill Collar Elevators
Drill collar elevators shall have bore dimensions that correspond to standard drill collar
groove dimensions as per relevant API standard RP 7G / API 7
9.1.8.1 INSPECTION
a)

Thoroughly clean and examine elevator adopter / collar for cracks visually and
further inspection schedule laid down earlier in this chapter 9.0

b

Make certain that elevator safety latch works easily and works

23

every time. Check top collar of elevator to be
certain that it is square.

attached
for
complete
safety
compliance.
All back twist must be avoided.
Hose to be suspended in normal
unstressed position from stand pipe to
swivel.
Permissible test medium: mud, oil or
water with precaution that all air is bled
off.
Duration of test pressure limit not to
exceed 10 minutes.
Field test pressure not to exceed 1.25
times the maximum rated working
pressure.
Field-testing to be conducted under the
supervision of competent person.

ii.
iii.
c) Check for Center Latch Elevators
Latch the elevator, then wedge front and back
of elevator open and measure at largest part of
top bore straight across between link arms.
This methods will

iv.

v.
vi.

measure total wear in bore (of which there will
be very little) and wear on hinge pin and latch
surfaces. Wear should not be allowed to go
above 1/32 inch on elevators for 5 5/8” OD and
smaller drill collar’s O.D. and 1/16” for drill
collars larger than 5 5/8”OD.
d) Check for Side Door Elevators: Latch the
elevator then wedge latch open measure top
bore from front to back, same wear allowable as
per center latch elevator.
Check elevator
shoulder on drill collar to be certain that it is
square.
9.1.9

vii.

9.1.10 Inspection of Hoisting Equipment
All hoisting tools on the rotary drilling rig
should have inspection schedule as listed
earlier in this chapter.
A.
i.

Rotary Hose

The length of Rotary hose should be selected
according to Rig type , Kelly length in order to
avoid any damage to hose at the highest and
lowest position of swivel.
9.1.9.1 Safety Chains for Rotary hose
The safety chains should be as short as
possible without restricting the movement of the
hose when the swivel is at its highest point and
lowest point of operations. The safety chain at
the stand pipe end of the hose should be
attached to a derrick upright rather than to a
transverse girt allowing upward movement of
travelling block. The safety chain at the swivel
end of the hose is attached to the lug on the
swivel body or housing.

ii.

iii.

9.1.9.2 Testing of Rotary Hose
Field testing of rotary hose, when required for
establishing periodic safety levels of continued
operations, should be conducted with these
factors as a guide.
i.

Visual inspection should include
examination of any external damage to
the body, structure & couplings. Safety
chains should be checked and properly

B.
i.

General Inspections
Field inspection of hoisting equipment
in an operating condition , should be
done by a crew or supervisor as
elaborated in inspection schedule of
category I. Persons inspecting hoisting
equipment on a daily basis, should look
for cracks, loose fitting connections or
fasteners, elongation of parts and any
sign, excessive wear or overloading.
Any equipment found to show cracks,
excessive wear etc. should be
removed from service immediately.
The weekly inspection is to be carried
out as stated in Category II Inspection
(Refer Inspection and Maintenance
schedule). The oil and grease be
removed from surfaces to be inspected
(Use detergents if necessary). Paint
should be removed from high stress
areas.
The annual inspection is to be carried
out as per Category III inspection .In
this type of inspection, it involves
disassembly
to
access
specific
components.
Disassembly Inspection
Equipment should be taken to a suitably
equipped facility and all parts checked
for excessive wear, cracks, flaws etc.
Visual and non-destructive techniques
(NDT) are used to identify the worn
part.
24

ii.

The equipment should be disassembled
as much as necessary to permit NDT
inspection of all load bearing parts.
The inspection is to be made by only
technically competent personnel.
All parts must be cleaned, by a suitable
method so that it is free of all dirt paint,
grease, oil, scale etc. prior to
inspection.
Minor cracks or defects, which may be
removed without reducing safety or the
operational rating of the equipment, can
be so removed by grinding or filing
After removal of the defect the part
should again be inspected by an
appropriate NDT method to ensure that
the defect has been completely
removed/repaired.

iii.
iv.

v.

vi.

i.

ii.

iii.

9.1.11.2 Inspection Methods
i.

Caution:
Repairs and modification, including welding can
substantially reduce the rating of the equipment.
9.1.11 Tool Joint Inspection:
ii.
The rotary tool joint connections in the drill
string, above the rotary table, must be
independently inspected for integrity or
indications of possible failure.

As a minimum those inspections should
be made prior to drilling to any of the
deeper formations or after drilling
approximately 50,000 feet in shallow
areas.
If deterioration is progressing ,it may be
necessary to make inspection at a rate
of more than normal frequency.
Consideration should be given to drilling
conditions and loading of the drill
strings in operation such as fishing,
stuck up and other complications etc.
These tool joints should also be
inspected every time the drill pipe is
inspected.

Normally the inspections are made by
technically competent agencies having
the proper equipment, gauges and
trained personnel by using prevailing
methods such as ultrasonic testing,
magnetic particle inspection or other
electro-magnetic techniques etc.
Written report of all test results should
be retained as permanent records.

10.0 GLOSSARY
Crown Block Assembly

Possible Causes of Tool Joint Failures are: i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
ix.
x.
xi.
xii.
xiii.
xiv.

Failure to inspect and gauge the tool
joints
Infrequent inspection and gauging
Improper interpretation of test result
Worn thread gauges
Damaged box or pin prior to make up
Box and pin not squarely shouldered
Galled tool joint threads
Crooked kellys
Loose connection (not fully torqued)
Mud cut connections
Drilling with rotary table tilted
Strain on drill string exceeding yield
strength of pipe or tool joints.
Use of Improper thread dope
Caution:
Any leak or wash out
even small, must be investigated
immediately upon detection, suspend
operations at once and replace or
renew the affected tool joint sub,
connection etc.

9.1.11.1 Frequency of Inspection

The stationary sheave or block assembly
installed at the top of a derrick or mast.
Derrick
Semi-permanent structures of square or
rectangular cross section having members that
are latticed or trussed on all four sides.
Mast
A structural tower comprised of one or more
sections assembled in a horizontal position near
the ground and then raised to the operating
position. If the unit contains two or more
sections, it may be telescoped or unfolded
during the erection procedure.
Derrick Inspection
Derricks should be thoroughly inspected after
erection to see that all members and bolts are
in place and that the latter are tight and
equipped with suitable lock washers. This
inspection should ensure that no member has
been installed in a manner that will impair the
safety of the derricks.
Brake
A device used for retarding or stopping monitor
or holding.
Brake Shoe
25

That part of a shoe type brake or clutch which
maks contact with brake drum.
Clutch
A means for engagement or disengagement of
power.
Counter Weight
Weight used to supplement the weight of the
working tools / equipment in providing stability
for the working tool.
Hoisting
The process of lifting.
Hoist Mechanism
A hoist drum and rope reeving system used for
lifting and lowering loads.
Hoist Rope
Wire rope involved in the process of lifting.
Casing Line
Wire rope used for hoisting and constructed
between drawworks and travelling block.
Hook Block
Block with hook attached used in lifting service.
Sling
An assembly which connects the load to the
material handling equipment.
Swivel
A load-carrying member with thrust bearing to
permit rotation under load in a place
perpendicular to the direction of the load.
Wire Rope
A flexible, multi-worked
member usually
consisting of a core member around while a
number of multi-wired strands are laid or
basically wound.
Power subs
A power sub is a device that moves with the
travelling block and is designed to provide rotary
power to the top of the drill string for drilling
operations. It attaches to the bottom of the
rotary swivel but does not include a rotary seal
or bearing for supporting the drill string weight.
Master Bushing

It is a solid / split type bushing that is used with
Rotary table opening to accommodate slips /
kelly bushing.
Rotary Slip
Rotary slips are assembly of various segments
to grip different sizes of tubular and to match
the dimension to permit operation in standard
master bushings.
Kelly
It is a hollow tubular having hexagonal / square
edge to transmit rotation from rotary table / kelly
bushing to the drill string.
Kelly Bushing
Kelly bushings are used to transmit Rotary
table rotation to kelly.
Rotary Hose
It is a flexible connection between stand pipe
and swivel facilitating the high pressure flow of
mud while drilling the kelly length.
Elevators
It is a handling tool to be used for lifting of drill
pipes, drill collars, casing pipes and tubing.
Rotary Tong
It is a handling tool used for making up or
breaking up of tool joint connection at a desired
torque.
Spinner
It is a device used for making up of tubular
connection by spinning action.
11.0 REFERENCES
1. API RP 54 Occupational safety For Oil and
Gas Well Drilling And Servicing operation
2. Drilling Operation manual
3. IADC Journals
4. Oil Mines Regulation
5. API standard 8A
6. API standard 7
7. API standard 7 K
8. API standard 8C

26

Annexure I
PRE SPUD CHECK LIST FO R DRILLING RIG S
Rig No.......... ...........Well No......................Date.....................Project.
We the undersigned as the member of spudding conference checked the readiness
of the drilling rig...... ....................for spudding. Following observations recorded.
A)

DRILLING PART

1 Whether contingency plan for
fire and Blowout displayed
2 Whether Safety And
Environment policy of ONGC
displayed
3 Whether layout plan &
prohibitory sign boards displayed
4 Whether members of Rig crew
provided with PPE.
5 Whether railings around derrick
floor/ engine/mud tank walk ways
provided
6 Availability of GTO
7

Availability of first-aid box & stretcher

8

Availability of fire fighting equipment

9

Availability of safety belt with life line

10 Availability & condition of Emergency vehicle

11 Availability of portable gas
detector and its
functional status
12 Condition of ladders

13 Condition of casing line
14. Condition of safety lines for tongs &
status of fastening clamps

15. Condition of handling tools viz- elevators, slips & power tongs etc.
16. Status of control instruments
17. Functional status of Floor-o-matic and Crown-o-matic devices
18. Functional status of Top-man escape device
19. Functional status of Fall prevention device
20. Availability of Trip tank & its functional status
21. Status of BOP control system including
remote control system
22. Status of Rig building
23. Any other point
B) M ECHANICAL & ELECT RICAL PART
1. Condition of Power-pack Engines

2. Condition of Mud pumps
3. Condition of Compressors
4. Condition of Generators

l)
2)
3)
1)
2)
1)
2)
I)
2)
3)

6. Condition of mech./ pneumatic / hydro-matic brake
7. Condition of solid control equipment
8. Whether pressure relief line of mud pumps fitted and secured
9 Status of guards on moving parts
10 Status of auto shut off system
11 Status of pressure vessels testing & record thereof
12 Availability of spark arresters in the exhaust
manifold of engines
13 Status of communication system
14 Status of earthing system
15 Whether sufficient illumination provided at
the rig

28

16 Whether light point provided in the toilet
17 Availability of Emergency light
18 Availability of Aviation light at gin pole
19 Any other point
C) CIVIL PART

1 Status of hardening and rolling of
Drill-site area
2

Condition of approach road

3

Parking area of logging unit

4

Capacity of waste pit

5

Capacity of oil-pit

6

Capacity of fire water tank

7

No. of rooms made for storing chemicals

8 Whether drinking water tank covered
9 Whether toilet provided with water connection
10 Whether septic tank provided
11 Whether proper drainage system with brick work provided
12 Whether fencing around Drill site provided
13 Whether fencing around oil pit provided
14 Whether fencing around fire pit provided
15 Whether locking system to chemical store room provided
16 Whether sand cushion provided at the landing points of Topman escape device
17 Any other point

Annexure II

29

PRE W O RK O VER CHECK LIST FO R W O RK O VER RIG S
Rig No.......... ...........Well No......................Date.....................Project.
We the undersigned as the member of spudding conference checked the readiness
of the drilling rig...... ....................for spudding. Following observations recorded.
A)

PRODUCTION PART

1 Whether contingency plan for
fire and Blowout displayed
2 Whether Safety And
Environment policy of ONGC
displayed
3 Whether layout plan &
prohibitory sign boards displayed
4 Whether members of Rig crew
provided with PPE.
5 Whether railings around derrick
floor/ engine/mud tank walk ways
provided
6 Availability of WELL PLAN
14 Availability of first-aid box & stretcher
15 Availability of fire fighting equipment

16 Availability of safety belt with life line
17 Availability & condition of Emergency vehicle

18 Availability of portable gas
detector and its
functional status
19 Condition of ladders

20 Condition of casing line
14. Condition of safety lines for tongs &
status of fastening clamps
15. Condition of handling tools viz- elevators, slips & power tongs etc.

30

16. Status of control instruments
17. Functional status of Floor-o-matic and Crown-o-matic devices
18. Functional status of Top-man escape device
19. Functional status of Fall prevention device
20. Availability of Trip tank & its functional status
21. Status of BOP control system including
remote control system
22. Status of Rig building
23. Any other point
B) M ECHANICAL & ELECT RICAL PART
1. Condition of Power-pack Engines

2. Condition of Mud pumps
3. Condition of Compressors
4. Condition of Generators

l)
2)
3)
1)
2)
1)
2)
I)
2)
3)

6. Condition of mech./ pneumatic / hydro-matic brake
7. Condition of solid control equipment
8. Whether pressure relief line of mud pumps fitted and secured
9 Status of guards on moving parts
10 Status of auto shut off system
11 Status of pressure vessels testing & record thereof
12 Availability of spark arresters in the exhaust
manifold of engines
13 Status of communication system
14 Status of earthing system
15 Whether sufficient illumination provided at
the rig
16 Whether light point provided in the toilet

31

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