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Schlumberger Public
Subsea Well Intervention
RPSEA Presentation
October 31st 2006
Presentation Intent
• To overview current intervention landscape • To describe the drivers for Intervention • To identify and describe the major activities and hardware within a typical Subsea Intervention • To outline typical role of the underwater vehicle within an intervention • Etc…..
Schlumberger Public
To offer input into discussion of role of Autonomous / Robotics technologies In Subsea Intervention Arena
Agenda
• Well Geometry (Features Overview) – Tom Zimmerman • Subsea Well Intervention Overview – Joe Scranton • Intervention Definition / Drivers • Categorization of Intervention • Key systems overviews • The intervention vessel • The well control system • The underwater vehicle • The Subsea Intervention • Subsea vehicle duties within well intervention • ROV Tooling Overview • AUV applicability in the intervention marketplace
Schlumberger Public
Schlumberger Public
Subsea Light Well Intervention A Definition
The Subsea landscape
Metering & Control Systems Tension Leg Platforms Floating Production Storage & Offloading Vessels
Surface
Surface Well Systems Light Well Intervention Subsea Drilling Systems Standard Subsea Trees Subsea Processing
Schlumberger Public
Subsea
Subsea Template Systems
Subsea Manifold Guidelineless Deepwater Trees
Smart Well Control Systems
ROV Tie-In Systems
Subsurface
Growth in Subsea Developments
Schlumberger Public
Economic Drivers for Intervention
Subsea wells under perform dry tree wells by an estimated 25% This short fall in production equates to $20.7 Billion per annum Norwegian Petroleum Directorate (NPD) estimate recovery factor improvements of 5% attributable to well intervention Prize = $5.15 Billion Per Year
Schlumberger Public
Definition of Light/Medium Well Intervention
“Any operation in a subsea wellbore that does not need a drilling rig to gain access to the well, to convey the service .. or .. carry out the Source: Deepstar Report 2002 operation!”
However….
Schlumberger Public
• Subsea wells under perform platform / dry tree wells • Cost of intervention prohibits intervention. • Lack of Subsea Christmas Tree commonality makes this task
difficult The value is in the well work, the cost is in the access.
Why do we intervene Subsea wells…?
To manage the production of the well: • Maintain or Improve production levels • Repair wellbore mechanical failures • Terminate / suspend production Via well diagnostics: • Flow characteristics • Geological data • Fluids data Via altering the state of the well and/or well geometry: • Pro-actively(planned) or Re-actively (unplanned/failure) • Shut off unwanted water production • Reservoir Stimulation / Fracturing • Re-perforating the production intervals or establishing new intervals • Open/closing valves • Replacing parts • Removing scale or wax precipitates • Setting plugs • Etc………
Schlumberger Public
What do we use to intervene the Slickline deployment technology wells…?
• • Monofilament wire used to mechanically convey tools into wellbore. High tensile wire spooled on and off a powered drum Slickline = Pulling
Schlumberger Public
Wireline deployment technology • Multi-strand cable for mechanical conveyance of tools into wellbore, as well as provide an electrical / fiber optic communication path to the operator. • High tensile cable spooled on and off a powered drum Wireline = Pulling + Communication Coiled Tubing deployment technology • Rolled & Welded continuous length of steel tubing which is used to convey tools, provide communication path, as well as provide a fluid flow path. • Coiled tube spooled on and off a reel, utilizing an “Injector” system. • Tube can have integrated Wireline Coiled Tubing = Pulling + Communication + Pushing + Pumping
• •
What problems does being “Subsea” Well Control is priority numberCreate…? one!
Safety • Hazardous working environment • Personnel Risk • Movement, Pressure, Weather, Heavy Lifts, etc Dynamic working relationship • Between work platform (vessel) and wellhead (on seabed) Risk of environmental release Lack of close contact with intervention systems / tooling • Loss of senses (direct) / Feedback • HMI (Human Machine Interface)Gap • Up to 10,000ft. Variable weather conditions Etc…………
Schlumberger Public
• • •
• •
Typical Intervention Services Utilization Models
Production Logging: 35%
Stimulation: 17%
SCSSV Change-out: 12%
Subsea Well Intervention (Type) Analysis
Tree Controls: 7%
Schlumberger Public
Permanent Gauges: 6%
Covert to WI: 3%
Re-completion: 3%
Tree Replacement: 3%
Abandonment: 2%
Gas Lift Valves: 2%
Perforation: 2%
Tubing repair: 2%
Fishing: 1%
Flowline: 1%
• 85% of which is in well intervention • 52% is Wireline / Slickline serviceable
Source K-Log 1997
Jumper: 1%
Well Suspension: 1%
Tubing hanger replacement: 1% General Valve replacement: 1%
Schlumberger Subsea Intervention Systems
Subsea Intervention Lubricator (SIL) • Since late 80’s an excess of 250 wells intervened
• Cased Hole Logging, Perforating, Slickline
WellOPSUK Seawell
Schlumberger Public
Subsea Intervention System Development • 7 3/8” x 10Kpsi system designed and delivered to Caldive
• For both Horizontal x Conventional Tree styles
Subsea Intervention Lubricator
Subsea Completion Tree (SenTREE) • Since late 1999 an excess of 200 wells intervened
• 150 Additional wells committed
7 3/8” x 10kpsi SS Int. System Large Bore SenTREE System
Intervention Genesis & Industry Firsts
Flopetrol in Brazil 1970’s with a manned module for slickline First subsea intervention
BP Magnus July 1987
First field abandonment
Argyll field – Hamilton Brothers – Jan 1993
First subsea wellhead machining repair
Ellon field – Total – April 1995
Schlumberger Public
First subsea Cristmas tree change out
Ivanhoe / Rob Roy field – November 1995
First subsea coiled tubing intervention
Gannet field – Shell Expro – December 1997
First recover / re-installation of an ESP Xmas tree
Gannet field – Shell Expro – January 1998
First intervention into a horizontal Xmas tree
Arkwright field – Amoco – October 1998
First deep water field abandonment (Horizontal Trees)
Cooper – EEX – August 1999
Slb Compliant Guide System (2006…)
First diver less well de-commissioning operation in North sea
Tommeliten – Statoil – June 2000
2000 Onwards – Multiple Interventions (Light through heavy weight)
Schlumberger Public
Subsea Well Intervention Categorization
Subsea Intervention landscape
• • •
•
Water Depths shall vary:
• • 300 – 10,000ft (15,000ft by 2015) 1,000 – 15,000 psi (20,000 psi by 2015)
Schlumberger Public
Hydrocarbon pressures at the wellhead shall vary A vessel shall be present
• Positioned above well throughout intervention • Within +/- 100m watch circle of wellhead +/- 100 Crew required for vessel / Intervention management
•
Control of well is handed over to vessel at time of intervention
• Production facility shall not have control Duties dependant on SS Intervention system design. Support vehicle(s) shall be managed from intervention vessel. Up to 2 weeks
•
A Subsea support vehicle(s) shall always be used
• •
•
Durations shall vary (depending on WD, intervention need, etc)
•
Subsea Well Intervention
Well Intervention Vessel Categories
VESSEL(A)
Light intervention
VESSEL(B)
Medium intervention
VESSEL (C)
Heavy Intervention
Schlumberger Public
Subsea Well Intervention
Well Intervention Vessel Categories
Cat A
Light intervention
Cat B
Medium intervention
Cat C
Heavy Intervention
Schlumberger Public
• •
Wireline and Slickline Benchmark 9 days/ well job $150K – 200K /day
• •
Coiled Tubing, Wireline and Slickline • Heavy Operations Benchmark 9 days/ well job $150K – 300K /day
•
Benchmark 15 days/ well job $360K – 840K/day
•
Operations
•
Operations (Cat A +)
•
Operations (Cat B +)
Logging (PLT’s) Light perforating Zone isolation Plug setting/removal
Flowline Intervention Well commissioning (TCP guns+unloading) Well abandonment (P&A) Downhole Pump changeout Squeeze, acidizing or fracturing Sand or Scale cleanout Water shut-off (Plug and perf or patch) Scraping DH valve retrieval, replacement, shifting Casing leak repairs
Scale milling Completion change-out/ repair Re-drill or sidetrack Xmas tree change-out
Schlumberger Public
Subsea Well Intervention Key Sub-System Overviews
The Subsea landscape
The Subsea Metering & Vehicle Control
(Intervention Supp.)
Surface Well Systems Systems
The Vessel
(Work Platform)
Tension Leg Platforms Floating Production Storage & Offloading Vessels
Light Well Intervention
The Intervention System
(Temp. Well Ctrl.)
Schlumberger Public
Subsea Drilling Systems
The Standard SubseaSubsea Trees Tree
(Perm.Prod.Ctrl.)
Subsea Processing
Subsea Manifold Smart Well Control Systems Subsea Template Systems ROV Tie-In Systems Guidelineless Deepwater Trees
Scope of Supply – Light/Medium Weight Intervention
Vessel
Schlumberger Public
Subsea Well Intervention – The Vessel
• • Provides a mobile work platform from which the Subsea Intervention activities take place. Provides support capabilities to the operation in the form of: • Heavy Lift • Derrick and Crane • Moon Pool • Subsea Vehicles (ROV) • Tailored bed capacity (100+) • Fluids handling • Fire and Gas Systems Vessel: • Monohull (Purpose built / DP2+) • Semi-Submersible Size: • Monohull: 100-120m / 15,000tonnes • Semi: 4,000VDL / 24,000tonnes
Schlumberger Public
•
•
Subsea Well Intervention – The Tree
• • • Positioned on seabed, located on Subsea wellhead • Permanently (upto 25years producing life) Provides, via control system, well control between well itself and seabed pipeline facilities Designed and manufactured: • By multiple companies • Using industry standards. Two dominant tree styles • Horizontal / Vertical (referring to axis that valves are located
w.r.t wellbore)
Schlumberger Public
•
• •
Tree styles alters manor in which intervention takes place, but does not alter vehicle activities. Size: • 4m3 x 40-60tonnes Cost: • $3,000-$6,000k
•
Subsea Well Intervention – Intervention Hardware
• Provides the ability to re-enter a Subsea well (on a temporary basis) with a variety of tools: • To either effect a physical change of state in well • To establish data of well condition Establishes additional well control hardware onto well, beyond that typically resident in Subsea tree. Allows the insertion and removal of intervention tooling into the well, whilst the well remains pressurized. Designed and manufactured: • By multiple companies • Using industry standards. Size: • (4m x 4m x 15m) x 40 - 60tonnes Cost: • $6,000k to $30,000k
Schlumberger Public
• • •
• •
Intervention System Summary
Subsea Lubricator Example
Subsea Stuffing Box / Grease Head • Provides environmental seal for slickline / wireline and wellbore
• Retrieve-able interface for running intervention tools
Upper Well Control Head Assembly (Wireline / Slickline) • Provides well control in upper lubricator section
Schlumberger Public
• Incorporates tool catcher
Lubricator Section • Pressure containing section for storing wellbore tools
• Length can be varied
Emergency Disconnection Assembly • Provides remotely controlled interface for separating lubricator
from Lower well control stack
Lower Well Control Assembly • Small bore BOP system to provide additional barriers to environment fo • Tree Interface Assembly / Tree Running Tool • Tree / Well specific interface
• Allows LWI System to mate with well intervention activities Contains valves/rams to cut intervention media / tools
Schlumberger Public
Subsea Well Intervention The role of the vehicle
Subsea Xmas Tree
Vehicle Duties within an Intervention
Survey (Visual only) • Well position establishment / Depth correlation • Leak Detection • Interface condition (prior to intervention) • Valve position verification • Connector position verification • Etc….. Well Preparation (Varies depending on intervention) • Obstruction removal (manipulator) • Guideline / Guidewire establishment (manipulator) • Protective cover removal (manipulator) • Lift line establishment (manipulator)
• Tree Cap / Wellhead Connector / etc.
Schlumberger Public
•
Vertical / Conventional Tree
Etc…..
Subsea Xmas Tree
Vehicle Duties within an Intervention
Well Intervention (Varies depending on intervention) • Valve Actuator Override (TDU / Piston / T-Tool)
• Temporary / Permanent
Schlumberger Public
• • • • • • • • • •
Vertical / Conventional Tree
Wellhead Connector Override (Hyd Jack) Sub-assembly retrieval (Spec Tooling/ Piston / T-Tool)
Choke / Control Module / Cap / MPFM / etc…. Lift line establishment (manipulator) • Tree Cap / Wellhead Connector / etc. Heavy lift guidance (thrust) •
Function Hot-stabbing (Hydraulically / Electrically) Measurement Gasket / Seal change-out (manipulator) Surface Cleaning (manipulator / Brush / Jet) Video Support Etc…..
Schlumberger Public
Subsea Well Intervention
ROV / AUV Considerations
ROV use in Subsea Interventions
Pros
• Power availability • Hydraulic and / or electrical • 100-500hp @ thrusters • Continuous Communications / Control • Robust – Fiber Optic to surface control & operator • Real-time feedback • Multi-channel video • Force feedback tactility of tooling systems
Schlumberger Public
•
Cons
• Vessel Dependency • Vessel needs to be located very close to Subsea operation • Excursion limited to 10’s of meters from TMS Tether • Limiting to freedom of vehicle within structures
•
Typical ROV Interfaces / Tools (Common with
Intervention)
ROV Panel • Project specific interface • Mounted on side face of SS Structure allowing vehicle to dock. • Typically uses API 17D Interfaces • Small valve rotation • Hydraulic/electrical hot stabbing • Video Support Flying Lead Orientation Tool (FLOT) • Project specific interface • For attaching/removing hydraulic/electrical connections • FLOT operations require lifting of umbilicals (100’s lbs), as well as torque/video activity. ROV Manipulator • Electro/mechanical arm, with multiple degrees of freedom.
Schlumberger Public
ROV Interface panel
Flying Lead Orientation Tool
ROV Manipulator Arm
AUV use in Subsea Interventions
Pros
• Tether-Less • No physical connection to support vessel once launched (Vessel can multi-task) • Can be launched without surface support vessel • Opens weather window of utilization Power • Limited in power and duration of operation due to power limitations • Battery / Fuel Cell • Limited horsepower reduces ability for AUV to offer mechanical services Subsea (Push/Pull/Turn/Lift…) Surface Vessel Proximity Dependency - Communications • Analog acoustic within 90deg comms cone from surface (Digital Spread Spectrum enhances this)
Schlumberger Public
Cons
•
•
Subsea Well Intervention
RPSEA Presentation
October 31st 2006
Schlumberger Public
End
Subsea Well Intervention
RPSEA Presentation
October 31st 2006
Presentation Intent
• To overview current intervention landscape • To describe the drivers for Intervention • To identify and describe the major activities and hardware within a typical Subsea Intervention • To outline typical role of the underwater vehicle within an intervention • Etc…..
Schlumberger Public
To offer input into discussion of role of Autonomous / Robotics technologies In Subsea Intervention Arena
Agenda
• Well Geometry (Features Overview) – Tom Zimmerman • Subsea Well Intervention Overview – Joe Scranton • Intervention Definition / Drivers • Categorization of Intervention • Key systems overviews • The intervention vessel • The well control system • The underwater vehicle • The Subsea Intervention • Subsea vehicle duties within well intervention • ROV Tooling Overview • AUV applicability in the intervention marketplace
Schlumberger Public
Schlumberger Public
Subsea Light Well Intervention A Definition
The Subsea landscape
Metering & Control Systems Tension Leg Platforms Floating Production Storage & Offloading Vessels
Surface
Surface Well Systems Light Well Intervention Subsea Drilling Systems Standard Subsea Trees Subsea Processing
Schlumberger Public
Subsea
Subsea Template Systems
Subsea Manifold Guidelineless Deepwater Trees
Smart Well Control Systems
ROV Tie-In Systems
Subsurface
Growth in Subsea Developments
Schlumberger Public
Economic Drivers for Intervention
Subsea wells under perform dry tree wells by an estimated 25% This short fall in production equates to $20.7 Billion per annum Norwegian Petroleum Directorate (NPD) estimate recovery factor improvements of 5% attributable to well intervention Prize = $5.15 Billion Per Year
Schlumberger Public
Definition of Light/Medium Well Intervention
“Any operation in a subsea wellbore that does not need a drilling rig to gain access to the well, to convey the service .. or .. carry out the Source: Deepstar Report 2002 operation!”
However….
Schlumberger Public
• Subsea wells under perform platform / dry tree wells • Cost of intervention prohibits intervention. • Lack of Subsea Christmas Tree commonality makes this task
difficult The value is in the well work, the cost is in the access.
Why do we intervene Subsea wells…?
To manage the production of the well: • Maintain or Improve production levels • Repair wellbore mechanical failures • Terminate / suspend production Via well diagnostics: • Flow characteristics • Geological data • Fluids data Via altering the state of the well and/or well geometry: • Pro-actively(planned) or Re-actively (unplanned/failure) • Shut off unwanted water production • Reservoir Stimulation / Fracturing • Re-perforating the production intervals or establishing new intervals • Open/closing valves • Replacing parts • Removing scale or wax precipitates • Setting plugs • Etc………
Schlumberger Public
What do we use to intervene the Slickline deployment technology wells…?
• • Monofilament wire used to mechanically convey tools into wellbore. High tensile wire spooled on and off a powered drum Slickline = Pulling
Schlumberger Public
Wireline deployment technology • Multi-strand cable for mechanical conveyance of tools into wellbore, as well as provide an electrical / fiber optic communication path to the operator. • High tensile cable spooled on and off a powered drum Wireline = Pulling + Communication Coiled Tubing deployment technology • Rolled & Welded continuous length of steel tubing which is used to convey tools, provide communication path, as well as provide a fluid flow path. • Coiled tube spooled on and off a reel, utilizing an “Injector” system. • Tube can have integrated Wireline Coiled Tubing = Pulling + Communication + Pushing + Pumping
• •
What problems does being “Subsea” Well Control is priority numberCreate…? one!
Safety • Hazardous working environment • Personnel Risk • Movement, Pressure, Weather, Heavy Lifts, etc Dynamic working relationship • Between work platform (vessel) and wellhead (on seabed) Risk of environmental release Lack of close contact with intervention systems / tooling • Loss of senses (direct) / Feedback • HMI (Human Machine Interface)Gap • Up to 10,000ft. Variable weather conditions Etc…………
Schlumberger Public
• • •
• •
Typical Intervention Services Utilization Models
Production Logging: 35%
Stimulation: 17%
SCSSV Change-out: 12%
Subsea Well Intervention (Type) Analysis
Tree Controls: 7%
Schlumberger Public
Permanent Gauges: 6%
Covert to WI: 3%
Re-completion: 3%
Tree Replacement: 3%
Abandonment: 2%
Gas Lift Valves: 2%
Perforation: 2%
Tubing repair: 2%
Fishing: 1%
Flowline: 1%
• 85% of which is in well intervention • 52% is Wireline / Slickline serviceable
Source K-Log 1997
Jumper: 1%
Well Suspension: 1%
Tubing hanger replacement: 1% General Valve replacement: 1%
Schlumberger Subsea Intervention Systems
Subsea Intervention Lubricator (SIL) • Since late 80’s an excess of 250 wells intervened
• Cased Hole Logging, Perforating, Slickline
WellOPSUK Seawell
Schlumberger Public
Subsea Intervention System Development • 7 3/8” x 10Kpsi system designed and delivered to Caldive
• For both Horizontal x Conventional Tree styles
Subsea Intervention Lubricator
Subsea Completion Tree (SenTREE) • Since late 1999 an excess of 200 wells intervened
• 150 Additional wells committed
7 3/8” x 10kpsi SS Int. System Large Bore SenTREE System
Intervention Genesis & Industry Firsts
Flopetrol in Brazil 1970’s with a manned module for slickline First subsea intervention
BP Magnus July 1987
First field abandonment
Argyll field – Hamilton Brothers – Jan 1993
First subsea wellhead machining repair
Ellon field – Total – April 1995
Schlumberger Public
First subsea Cristmas tree change out
Ivanhoe / Rob Roy field – November 1995
First subsea coiled tubing intervention
Gannet field – Shell Expro – December 1997
First recover / re-installation of an ESP Xmas tree
Gannet field – Shell Expro – January 1998
First intervention into a horizontal Xmas tree
Arkwright field – Amoco – October 1998
First deep water field abandonment (Horizontal Trees)
Cooper – EEX – August 1999
Slb Compliant Guide System (2006…)
First diver less well de-commissioning operation in North sea
Tommeliten – Statoil – June 2000
2000 Onwards – Multiple Interventions (Light through heavy weight)
Schlumberger Public
Subsea Well Intervention Categorization
Subsea Intervention landscape
• • •
•
Water Depths shall vary:
• • 300 – 10,000ft (15,000ft by 2015) 1,000 – 15,000 psi (20,000 psi by 2015)
Schlumberger Public
Hydrocarbon pressures at the wellhead shall vary A vessel shall be present
• Positioned above well throughout intervention • Within +/- 100m watch circle of wellhead +/- 100 Crew required for vessel / Intervention management
•
Control of well is handed over to vessel at time of intervention
• Production facility shall not have control Duties dependant on SS Intervention system design. Support vehicle(s) shall be managed from intervention vessel. Up to 2 weeks
•
A Subsea support vehicle(s) shall always be used
• •
•
Durations shall vary (depending on WD, intervention need, etc)
•
Subsea Well Intervention
Well Intervention Vessel Categories
VESSEL(A)
Light intervention
VESSEL(B)
Medium intervention
VESSEL (C)
Heavy Intervention
Schlumberger Public
Subsea Well Intervention
Well Intervention Vessel Categories
Cat A
Light intervention
Cat B
Medium intervention
Cat C
Heavy Intervention
Schlumberger Public
• •
Wireline and Slickline Benchmark 9 days/ well job $150K – 200K /day
• •
Coiled Tubing, Wireline and Slickline • Heavy Operations Benchmark 9 days/ well job $150K – 300K /day
•
Benchmark 15 days/ well job $360K – 840K/day
•
Operations
•
Operations (Cat A +)
•
Operations (Cat B +)
Logging (PLT’s) Light perforating Zone isolation Plug setting/removal
Flowline Intervention Well commissioning (TCP guns+unloading) Well abandonment (P&A) Downhole Pump changeout Squeeze, acidizing or fracturing Sand or Scale cleanout Water shut-off (Plug and perf or patch) Scraping DH valve retrieval, replacement, shifting Casing leak repairs
Scale milling Completion change-out/ repair Re-drill or sidetrack Xmas tree change-out
Schlumberger Public
Subsea Well Intervention Key Sub-System Overviews
The Subsea landscape
The Subsea Metering & Vehicle Control
(Intervention Supp.)
Surface Well Systems Systems
The Vessel
(Work Platform)
Tension Leg Platforms Floating Production Storage & Offloading Vessels
Light Well Intervention
The Intervention System
(Temp. Well Ctrl.)
Schlumberger Public
Subsea Drilling Systems
The Standard SubseaSubsea Trees Tree
(Perm.Prod.Ctrl.)
Subsea Processing
Subsea Manifold Smart Well Control Systems Subsea Template Systems ROV Tie-In Systems Guidelineless Deepwater Trees
Scope of Supply – Light/Medium Weight Intervention
Vessel
Schlumberger Public
Subsea Well Intervention – The Vessel
• • Provides a mobile work platform from which the Subsea Intervention activities take place. Provides support capabilities to the operation in the form of: • Heavy Lift • Derrick and Crane • Moon Pool • Subsea Vehicles (ROV) • Tailored bed capacity (100+) • Fluids handling • Fire and Gas Systems Vessel: • Monohull (Purpose built / DP2+) • Semi-Submersible Size: • Monohull: 100-120m / 15,000tonnes • Semi: 4,000VDL / 24,000tonnes
Schlumberger Public
•
•
Subsea Well Intervention – The Tree
• • • Positioned on seabed, located on Subsea wellhead • Permanently (upto 25years producing life) Provides, via control system, well control between well itself and seabed pipeline facilities Designed and manufactured: • By multiple companies • Using industry standards. Two dominant tree styles • Horizontal / Vertical (referring to axis that valves are located
w.r.t wellbore)
Schlumberger Public
•
• •
Tree styles alters manor in which intervention takes place, but does not alter vehicle activities. Size: • 4m3 x 40-60tonnes Cost: • $3,000-$6,000k
•
Subsea Well Intervention – Intervention Hardware
• Provides the ability to re-enter a Subsea well (on a temporary basis) with a variety of tools: • To either effect a physical change of state in well • To establish data of well condition Establishes additional well control hardware onto well, beyond that typically resident in Subsea tree. Allows the insertion and removal of intervention tooling into the well, whilst the well remains pressurized. Designed and manufactured: • By multiple companies • Using industry standards. Size: • (4m x 4m x 15m) x 40 - 60tonnes Cost: • $6,000k to $30,000k
Schlumberger Public
• • •
• •
Intervention System Summary
Subsea Lubricator Example
Subsea Stuffing Box / Grease Head • Provides environmental seal for slickline / wireline and wellbore
• Retrieve-able interface for running intervention tools
Upper Well Control Head Assembly (Wireline / Slickline) • Provides well control in upper lubricator section
Schlumberger Public
• Incorporates tool catcher
Lubricator Section • Pressure containing section for storing wellbore tools
• Length can be varied
Emergency Disconnection Assembly • Provides remotely controlled interface for separating lubricator
from Lower well control stack
Lower Well Control Assembly • Small bore BOP system to provide additional barriers to environment fo • Tree Interface Assembly / Tree Running Tool • Tree / Well specific interface
• Allows LWI System to mate with well intervention activities Contains valves/rams to cut intervention media / tools
Schlumberger Public
Subsea Well Intervention The role of the vehicle
Subsea Xmas Tree
Vehicle Duties within an Intervention
Survey (Visual only) • Well position establishment / Depth correlation • Leak Detection • Interface condition (prior to intervention) • Valve position verification • Connector position verification • Etc….. Well Preparation (Varies depending on intervention) • Obstruction removal (manipulator) • Guideline / Guidewire establishment (manipulator) • Protective cover removal (manipulator) • Lift line establishment (manipulator)
• Tree Cap / Wellhead Connector / etc.
Schlumberger Public
•
Vertical / Conventional Tree
Etc…..
Subsea Xmas Tree
Vehicle Duties within an Intervention
Well Intervention (Varies depending on intervention) • Valve Actuator Override (TDU / Piston / T-Tool)
• Temporary / Permanent
Schlumberger Public
• • • • • • • • • •
Vertical / Conventional Tree
Wellhead Connector Override (Hyd Jack) Sub-assembly retrieval (Spec Tooling/ Piston / T-Tool)
Choke / Control Module / Cap / MPFM / etc…. Lift line establishment (manipulator) • Tree Cap / Wellhead Connector / etc. Heavy lift guidance (thrust) •
Function Hot-stabbing (Hydraulically / Electrically) Measurement Gasket / Seal change-out (manipulator) Surface Cleaning (manipulator / Brush / Jet) Video Support Etc…..
Schlumberger Public
Subsea Well Intervention
ROV / AUV Considerations
ROV use in Subsea Interventions
Pros
• Power availability • Hydraulic and / or electrical • 100-500hp @ thrusters • Continuous Communications / Control • Robust – Fiber Optic to surface control & operator • Real-time feedback • Multi-channel video • Force feedback tactility of tooling systems
Schlumberger Public
•
Cons
• Vessel Dependency • Vessel needs to be located very close to Subsea operation • Excursion limited to 10’s of meters from TMS Tether • Limiting to freedom of vehicle within structures
•
Typical ROV Interfaces / Tools (Common with
Intervention)
ROV Panel • Project specific interface • Mounted on side face of SS Structure allowing vehicle to dock. • Typically uses API 17D Interfaces • Small valve rotation • Hydraulic/electrical hot stabbing • Video Support Flying Lead Orientation Tool (FLOT) • Project specific interface • For attaching/removing hydraulic/electrical connections • FLOT operations require lifting of umbilicals (100’s lbs), as well as torque/video activity. ROV Manipulator • Electro/mechanical arm, with multiple degrees of freedom.
Schlumberger Public
ROV Interface panel
Flying Lead Orientation Tool
ROV Manipulator Arm
AUV use in Subsea Interventions
Pros
• Tether-Less • No physical connection to support vessel once launched (Vessel can multi-task) • Can be launched without surface support vessel • Opens weather window of utilization Power • Limited in power and duration of operation due to power limitations • Battery / Fuel Cell • Limited horsepower reduces ability for AUV to offer mechanical services Subsea (Push/Pull/Turn/Lift…) Surface Vessel Proximity Dependency - Communications • Analog acoustic within 90deg comms cone from surface (Digital Spread Spectrum enhances this)
Schlumberger Public
Cons
•
•
Subsea Well Intervention
RPSEA Presentation
October 31st 2006
Schlumberger Public
End
