GB2231071A - Subsea well maintenance system - Google Patents
Subsea well maintenance system Download PDFInfo
- Publication number
- GB2231071A GB2231071A GB8922227A GB8922227A GB2231071A GB 2231071 A GB2231071 A GB 2231071A GB 8922227 A GB8922227 A GB 8922227A GB 8922227 A GB8922227 A GB 8922227A GB 2231071 A GB2231071 A GB 2231071A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crane
- valve
- tree
- guide wire
- subsea
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000012423 maintenance Methods 0.000 title claims abstract description 14
- 238000003032 molecular docking Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 claims description 6
- 230000013011 mating Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000003578 releasing effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 241000282472 Canis lupus familiaris Species 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 210000003954 umbilical cord Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/04—Manipulators for underwater operations, e.g. temporarily connected to well heads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
- E21B34/04—Valve arrangements for boreholes or wells in well heads in underwater well heads
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
A system for providing remote maintenance to a subsea well provides means for lifting heavy components e.g. 19, 67, 71 or 73 to be interchanged. A crane 15 having a lifting arm 17 is lowered from a surface vessel onto the tree 11. A remote operated vehicle 33 having a manipulating arm assists the crane. The subsea tree 11 has at least one valve 67, 71, 73 which is mounted to the tree so as to allow removal of the valve by a vertical pull of the lifting arm of the crane. The remote operated vehicle releases the valve for removal. <IMAGE>
Description
SYSTEM FOR REMOTELY PERORENG 'lAINTENANCE ON A SSEA hELL
This invention relates in general to subsea wells, and in particular to components on the well and equipment lowered from a floating vessel by lines for remotely performing maintenance on the subsea well tree.
Subsea wells of the type concerned herein are of a type that have a production tree located on the sea floor. A subsea production tree is a large complex apparatus located on the sea floor at the top of a oil or gas well. A subsea tree has a number of valves which are hydraulically actuated. Other components measure pressure and temperature. Chokes regulate the flow of the production fluid. The various valves and other control equipment will be controlled remotely.
Maintenance on these control components will be required periodically. At the present, maintenance is performed in various manners. Divers are used. Also, remote operated vehicles, called ROV's, are deployed from the surface vessel on an umbilical cord. An ROV has a video camera and a manipulating arm capable of performing certain tasks.
Transporting tools and components from a surface vessel to a subsea structure, and retrieving the replaced components is a difficult task. Once at the subsea tree, the tools and components must be accurately positioned to interface with the tree to enable the intervention task to be accomplished. There are numerous components on a subsea tree that are too large and heavy to be transported by the presently available ROV's, even using buoyancy techniques.
Compensation for changes in weight due to component change out makes systems of this nature unattractive.
Large components can be lifted by the floating vessel. However, surface lifting is subject to wave motion. Present active heave compensation systems for wave motion cannot provide the level of positional accuracy required for a surface lift in most cases.
According to the invention there is provided a system for providing remote niaintenance in a subsea well as set out in Claim 1 or Claim 4 or Claim 6 or Claim 10.
According to another aspect of the invention there is provided a method for providing remote maintenance to a subsca well as set out in Claim 13.
An example of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a schematic view illustrating a system for providing remote maintenance to a subsea tree.
Figure 2 is an enlarged view of the crane of the system of Figure 1, showing the crane prior to landing.
Figure 3 is an enlarged view of the crane and ROV of
Figure 1, showing the crane landed on the subsea tree, and the ROV docked to the subsea tree.
Figure 4 is a top schematic view illustrating major components of the subsea tree which may be replaced remotely by the crane and ROV.
Figure 5 is a side view of a wing valve to be used with a subsea tree, and shown with a portion of the subsea tree.
Figure 6 is an enlarged sectional view of a portion of the wing valve of Figure 5.
SUMMARY OF THE INVENTION
In this invention, the subsea tree is configured so that the major control components are located on an upper section of the tree. Also, these components are located by mounting systems that enable them to be removed from the tree by an upward pull.
A crane is deployed from the surface vessel on a guide wire. The crane lands on top of the tree cap.
The crane has a lifting arm extending laterally outward that is capable of lifting fairly large components.
In addition, a tool skid or ROV is employed. The
ROV has a manipulating arm that performs lighter tasks.
Also, the manipulating arm will provide releasing action for the heavy components. The manipulating arm releases the component, while the lifting arm of the crane picks it up and replaces the component with a new component.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic view illustrating a system for providing remote maintenance to a subsea tree.
Figure 2 is an enlarged view of the crane of the system of Figure 1, showing the crane prior to landing.
Figure 3 is an enlarged view of the crane and ROV of Figure 1, showing the crane landed on the subsea tree, and the ROV docked to the subsea tree.
Figure 4 is a top schematic view illustrating major components of the subsea tree which may be replaced remotely by the crane and ROV.
Figure 5 is a side view of a wing valve to be used with a subsea tree, and shown with a portion of the subsea tree.
Figure 6 is an enlarged sectional view of a portion of the wing valve of Figure 5.
Referring to Figure 1, a subsea tree 11 for oil and gas production is shown located on the sea floor 13. The subsea tree 11 contains components for controlling the flow of oil and gas from the well. It will be connected to conduits for delivery of the production fluid. The subsea tree 11 will be remotely controlled by a production vessel.
In Figure 1, a crane 15 is shown located on top of the tree 11. Crane 18 will be deployed when replacement of a large control component of the subsea tree 11 is needed. Crane 15 has a lifting arm 17 extending laterally outward. Lifting arm 17 is capable of lifting components up to about 2000 Keg., and will be particularly used when a component weighs as much as 500 Kg.
The lifting arm 17 is shown latched to a control component 19 which is in the process of being removed from the tree 11. The crane 15 has a rack 21 wherein new components 23 can be stored while the crane 15 is lowered onto the tree 11. The old component 19 will be installed on the rack 21 while the crane 15 is retrieved to the surface.
The crane 15 is deployed on a guide wire 25.
Guide wire 25 is lowered and tensioned by means of a winch 27. The winch 27 and a boom 29 are located on a floating surface vessel 31. A wave compensator (not shown) of conventional structure, may be utilized to compensate for wave action on the surface vessel 31 by maintaining a constant tension on the guide wire 25.
In the preferred embodiment, crane 15 is supplied with hydraulic power for its various functions through an umbilical line (not shown) that extends to the surface vessel 31.
A tool skid, referred to herein as an ROV 33, is also utilized in performing maintenance on the tree 11.
ROV 33 has a manipulating arm 35. ROV 33 can perform a full range of observation and manipulation tasks, and has a video camera and other equipment needed for performing these various ancillary functions. The ROV 33 has means for docking the ROV 33 to the tree 11. The
ROV manipulating arm 35 also operates with the crane 15 to land the crane 15 and to release and fasten various heavy components which the crane lifting arm 17 will lift.
The ROV 33 is maneuvered by a conventionally designed remotely operated propulsion system 37, which itself is an remote operated vehicle. The propulsion system 37 mounts to the ROV 33. For the purposes herein, the propulsion system 37 and ROV 33 may be considered a single integral unit. The ROV 33 is connected by an umbilical line 39 to a subsea docking cage 41. The docking cage 41 is supported on the line 39 by a winch 43 on the surface vessel 31. The umbilical line 39 is deployed over a boom 45 and supplies hydraulic and electrical power to the ROV 33.
The ROV 33 is brought to the surface and lowered to the vicinity of the subsea tree 11 while docked in the docking cage 41.
Figure 2 shows the crane 15 in the process of being landed on the tree 11. In the deploying process, the crane 15 will be secured on guide wire 25 by a docking bullet 54. A gimbal 56 below the bullet 54 allows rotation of the crane 15 relative to the guide wire 25. A tail section of the guide wire 25 will pass through the crane 15 and extend a short distance below the crane 15. A latch 47 is located on the lower end of the guide wire 25.
The manipulating arm 35 of the ROV 33 will grab the latch 47 and stab it onto a mating docking profile 49. Latch 47 latches by 90 degree rotation by the ROV arm 35. The docking profile 49 is located on the tree cap 50 of the tree 11. This latches the guide wire 25 in place. Then the winch 27 (Fig. 1) can tension the guide wire 25.
In the preferred embodiment, the crane 15 has an umbilical hydraulic line (not shown) that extends to the surface alongside the guide wire 25. This hydraulic line supplies power to the docking bullet 54 to release the crane 15 for downward movement on the guide wire 25, to lock the crane 15 to the tree docking profile 49, and to perform the various arm 35 movements.
A climb down puller 53 is located within the crane 15. The climb down puller 53 comprises hydraulically driven rollers or wheels (not shown), which cause the crane 15 to move down the guide wire 25 while docking.
The climb down puller 53 will cause the crane 15 to move down until its base or mandrel connector 51 seats firmly on the docking profile 49. The mandrel connector 51 has hydraulically actuated dogs (not shown) which lock the crane 15 to the tree cap 50 of the subsea tree 11.
Figure 3 shows the crane 15 landed in place. The lifting arm 17 is a commercially available articulated member. It has a column 55, a boom 57 and a jib latch 61. The column 55, boom 57 and jib latch 61 are hinged together by joints 59, 60. The jib latch 61 will telescope to extend and decrease its length. It also has an engaging member on its end for releasably engaging well components. Hydraulic pistons (not shown) incorporated with the lifting arm 17 enable the crane 15 to move the jib latch 61 into position and lift the desired component. The column 55 is mounted on a swivel mechanism so that it can slew about 300 degrees around its longitudinal axis.
The various motions of the crane 15 are defined by pre-set end stops and detents (not shown). These stops are positioned at the surface vessel 31 (Fig. 1) prior to lowering the crane 15 into position. The stops enable the crane 15 to perform only a single function, and must be reset for other functions. The stops control the slew position of the column 55 and the positions of the boom 57 and jib latch 61.
Figure 3 shows the ROV 33 docked to the tree 11.
The docking is accomplished by a docking arm 63 which moves laterally outward from the ROV 33. The docking arm 63 grips a docking profile 65. Docking profile 65 is a vertical elongated member mounted to each guide post 66, as shown also in Figure 4. There will be four guide posts 66, one at each corner.
Referring still to Figure 3, some of the major components of the subsea tree 11 which are designed for replacement by the crane 15 are shown. These components are also shown in Figure 4. They will include a wing valve 67. Wing valve 67 will be one of the control components used for controlling flow from the tree 11. Wing valve 67 has an engaging profile or neck 69 on its upper end. Neck 69 is configured so that the jib latch 61 will engage it for lifting once the jib latch 61 is inserted over the neck 69 and rotated 90 degrees. Wing valve 67 is oriented vertically. It can be removed by an upward pull.
Other components located on the upper end of the tree 11 include a hydraulic control pod 71 of conventional nature, a production choke and actuator 73, and another wing valve 75 (Fig. 4). Note that each of these components has a neck similar to the neck 69.
Each of these components is mounted by a mounting means that allows it to be retrieved by an upward vertical pull.
Figure 6 illustrates more details of the wing valve 67. It has a body 77 with side walls separated by a central cavity containing a gate 79. Gate 79 has a hole 80 extending through it transverse to the axis of the body 77. A conventional hydraulic actuator (not shown) raises and lowers the gate 79 in a vertical direction to open and close the valve 67. The gate 79 moves past stationary seats 81 (only one shown) located
In order to retrieve the valve 67 by an upward pull, the blocks 89, 91 must be separated by about 3/4 inch from the body 77 for the flange 87 and gasket 85 to clear the grooves 95, 97. One way to handle this separation is by loosening the mounting of the flowline spool block 91. The ROV 33 releases a flowline connector member (not shown), which is connected to the flowline spool block 91 by a flowline spool piece.This allows a small rotation of a flowline spoolpiece to separate the blocks 89, 91.
Loosening the studs 93 and the flowline connector allows the blocks 89, 91 to spread apart and enables the wing valve 67 to be retrieved by an upward pull.
The studs 93 will be loosened and tightened by individual hydraulic tensioners (not shown), which are controlled by the manipulating arm 35 of the ROV 33 (Fig. 3). A similar mounting arrangement is used for wing valve 75 (Fig. 4).
The production choke actuator 73 has a hub clamp (not shown) that is released by the ROV 33 prior to lifting by the crane 15. The control pod 71 forms the central control distribution system for the subsea tree 11. The control pod 71 is linked to the lines of the tree 11, both electrical and hydraulic, by a connector interface (not shown). The control pod 71 stabs vertically into its connecter interface. It has a dog latch mechanism on its lower end to connect with the connector interface. The crane 15 will release these dogs by picking up on the neck located on the upper end of the control pod 71.
In operation, first, the cage 41 and ROV 33 will be lowered into the vicinity of the subsea tree 11.
The ROV 33 will be deployed over to the subsea tree 11, where it will remove a protective cap (not shown) from the subsea tree docking profile 49 (Fig. 2).
The end stops and detents of the crane 15 will be preset for the desired function, such as replacing a particular control component 19 with another control component 23 (Fig. 1). The new component 23 will be placed in the storage rack 21 of the crane 15. Then the crane 15 will be secured on the guide wire 25 with the docking bullet 54. The latch 47 (Fig. 2) will extend below. The guide wire 25 will be lowered down until the latch 47 is located adjacent the tree 11.
The ROV 37 is deployed then to grab the latch 47, carry it over to the docking profile 49 (Fig. 2), stab it into place and rotate it 90 degrees. The winch 27 (Fig. 1) will then take up the slack in the guide wire 25.
Hydraulic power supplied down the crane 15 umbilical will cause the climb down puller 53 to move the crane 15 downward onto the docking profile 49.
Once landed, the hydraulic power locks the mandrel connector 51 to the docking profile 49. The crane 15 will then be free to perform lifting tasks as it will be rigidly locked to the subsea tree 11.
The manipulating arm 35 of the ROV 33 will be moved by ROV 33 to the particular component desired to be replaced. For example, assuming that it is wing valve 67, the jib latch 61 will be moved onto the neck 69 and latched by 90 degree rotation of its end. The manipulating arm 35 will disconnect the hydraulic lines (not shown) from the hydraulic connector 88 (Fig. 6).
The manipulating arm 35 will disconnect the flowline connector (not shown). The manipulating arm 35 will loosen the studs 93 (Fig. 5), and cause the blocks 89, 91 to separate slightly.
Once loosened, the lifting arm 17 will pull the wing valve 67 vertically upward and place it in its rack 21 (Fig. 2). It will then take a new wing valve 67 and locate it between the blocks 89, 91. The manipulating arm 35 is then used to tighten the studs 93, replace the hydraulic lines to the hydraulic connector 88 and retighten the flowline connector. The crane lifting arm 17 then releases from the valve 67.
Hydraulic power will then be supplied to cause the mandrel connector 51 to release from the docking profile 49. The climb down puller 53 will pull the crane 15 upward on the guide wire 25 a selected distance. The docking bullet 54 will lock the crane 15 on the guide wire 25. The manipulating arm 35 will then release the latch 47 and thus the guide wire 25 from the docking profile 49. The winch 27 (Fig. 1) is then actuated to pull the crane 15 to the surface. The
ROV 33 will return to its cage 41. The cage 41 will then be retrieved to the surface by the winch 43.
The invention has significant advantages. The combination of the lifting crane and the ROV enables heavy components to be replaced on a subsea tree without divers. The mounting of the control components so that they can be removed by a vertical pull facilitates replacement by a crane.
Claims (14)
1. In a subsea well, an improved system for providing remote maintenance, comprising in combination:
a subsea tree;
at least one valve; and
mounting means for mounting the valve to the tree so as to allow removal of the valve from the mounting means by only a vertical pull once the mounting means has been released.
2. The system according to claim 1 wherein the valve has a body, and wherein the mounting means comprises a pair of blocks between which the body is sandwiched, and stud means for clamping the blocks together with the valve between.
3. The system according to claim 2, wherein the valve has a body with a sidewall containing a passage therethrough, the passage being encircled by a gasket for sealing against a mating one of the blocks, and wherein the system further comprises:
a protective circular flange encircling the gasket and protruding from the side of the body; and
a pair of grooves formed in the mating block, one for receiving the flange and one for receiving the gasket.
4. In a subsea well, an improved system for providing remote maintenance, comprising in combination:
a subsea tree;
at least one valve;
the valve having a body with a pair of sidewalls separated by a central cavity, each sidewall having a passage therethrough;
a gate carried in the cavity for movement between an open position in which the passages are open, and a closed position in which the passages are closed;
a pair of blocks, each having a sidewall that mates with one of the sidewalls of the body, each having a passage that registers with one of the passages in the body;
stud means for clamping the blocks together with the body between, and for releasing the blocks to allow removal of the body by an upward pull; and
neck means on an upper end of the valve for latching engagement by a lifting mechanism to lift the valve from between the blocks.
5. The system according to claim 4, wherein the valve body is mounted so that the gate moves in a vertical direction when moving between the open and closed positions.
6. A system for providing remote maintenance to a subsea well, comprising in combination:
a subsea tree;
a crane having a lifting arm;
deploying means for lowering the crane from a surface vessel releasably onto the tree and for retrieving the crane from the tree;
a remote operated vehicle having a manipulating arm;
means for lowering the remote operated vehicle to the vicinity of the tree, the remote operated vehicle being operable from the surface vessel;
at least one valve; and
mounting means for mounting the valve to the tree so as to allow removal of the valve by a vertical pull of the lifting arm of the crane once the mounting means has been released by the manipulating arm of the remote operated vehicle.
7. The system according to claim 6 wherein the mounting means includes a neck located on an upper end of the valve, and wherein the lifting arm of the crane has means for engaging the neck to lift the valve from the mounting means.
8. The system according to claim 6 wherein the lifting arm of the crane extends laterally outward from the crane and has a plurality of linking members articulated together.
9. The system according to claim 6 wherein the deploying means comprises a guide wire extending from the surface vessel and releasably connected to the tree, and means on he crane for moving up and down the guide wire.
10. A system for providing remote maintenance to a subsea well, comprising in combination:
a subsea tree having on its upper end a docking profile;
a crane having a lifting arm extending laterally outward therefrom;
a guide wire having a lower end;
means for lowering the guide wire from the surface vessel;
means for carrying the crane on the guide wire a selected distance above the lower end of the guide wire while the guide wire is lowered into the sea;
means for latching the lower end of the guide wire to the docking profile;
means in the crane for moving the crane down the
guide wire onto the docking profile after the lower
end of the guide wire is latched to the docking
profile;
means in the crane for releasably securing the
crane to the docking profile;
at least one control component; and
mounting means for mounting the control component to the tree so as to allow removal of the control component by a vertical pull, allowing the lifting arm of the crane to lift the control component from the mounting means and replace the control component with another.
11. The system according to claim 10 wherein the control component comprises a valve, the valve having a body, and wherein the mounting means comprises a pair of blocks between which the body is sandwiched, and stud means for clamping the blocks together with the valve between.
12. The system according to claim 10 wherein the mounting means requires an ROV to release the mounting means prior to removing the valve with the lifting arm of the crane.
13. A method for providing remote maintenance to a subsea well, comprising in combination:
providing a subsea tree with at least one valve;
mounting the valve to the tree so as to allow removal of the valve by a vertical pull when released;
providing a crane having a lifting arm;
lowering the crane from a surface vessel onto the tree;
lowering into the vicinity of the wellhead a remote operated vehicle having a manipulating arm; and
releasing the valve from the tree with the manipulating arm, removing the valve from the tree with the lifting arm, and replacing it with another.
14. The method according to claim 13 wherein the step of lowering the crane onto the tree comprises:
releasably mounting the crane to a guide wire a selected distance above the lower end of the guide wire;
lowering the crane and the guide wire into the sea until the lower end of the guide wire is adjacent-the subsea tree;
grabbing the guide wire with the manipulating arm and latching it to the subsea tree; then
applying tension to the guide wire; then
moving the crane downward on the guide wire until it lands on the subsea tree; then
releasably securing the crane to the subsea tree.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34297489A | 1989-04-25 | 1989-04-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8922227D0 GB8922227D0 (en) | 1989-11-15 |
| GB2231071A true GB2231071A (en) | 1990-11-07 |
Family
ID=23344120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8922227A Withdrawn GB2231071A (en) | 1989-04-25 | 1989-10-03 | Subsea well maintenance system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2231071A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2242214A (en) * | 1990-03-19 | 1991-09-25 | Holta Leif | Replacement tool |
| WO2001025083A1 (en) * | 1999-10-01 | 2001-04-12 | Richard Walker | Apparatus and method for positioning subaqueous articles |
| WO2013050411A3 (en) * | 2011-10-03 | 2013-12-19 | Aker Subsea As | Underwater vehicle docking station |
| CN104085517A (en) * | 2014-07-17 | 2014-10-08 | 泉州一露机械科技有限公司 | Maneuvering underwater diving chamber |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386741B (en) * | 2015-11-02 | 2017-10-31 | 江苏科技大学 | A kind of rotary moving linearly covers instrument |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1503963A (en) * | 1974-06-10 | 1978-03-15 | Chevron Res | System for operating hydraulic apparatus |
| GB1542691A (en) * | 1975-06-13 | 1979-03-21 | Seal Petroleum Ltd | Method of and tool for positioning a valve assembly on an underwater well head |
| GB2152556A (en) * | 1983-11-21 | 1985-08-07 | Elf Aquitaine | A device for positioning, activating and connecting modules of a sub-sea oil production station |
| GB2152565A (en) * | 1983-11-21 | 1985-08-07 | Elf Aquitaine | An oil production installation for a sub-sea station of modular design |
| GB2174442A (en) * | 1985-05-04 | 1986-11-05 | British Petroleum Co Plc | Subsea oil production system |
| GB2194980A (en) * | 1986-07-26 | 1988-03-23 | British Petroleum Co Plc | Control system for subsea oil production |
| GB2195686A (en) * | 1986-10-04 | 1988-04-13 | British Petroleum Co Plc | Subsea oil production system |
| GB2205877A (en) * | 1987-05-21 | 1988-12-21 | British Petroleum Co Plc | Insert choke and control module therefor |
-
1989
- 1989-10-03 GB GB8922227A patent/GB2231071A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1503963A (en) * | 1974-06-10 | 1978-03-15 | Chevron Res | System for operating hydraulic apparatus |
| GB1542691A (en) * | 1975-06-13 | 1979-03-21 | Seal Petroleum Ltd | Method of and tool for positioning a valve assembly on an underwater well head |
| GB2152556A (en) * | 1983-11-21 | 1985-08-07 | Elf Aquitaine | A device for positioning, activating and connecting modules of a sub-sea oil production station |
| GB2152565A (en) * | 1983-11-21 | 1985-08-07 | Elf Aquitaine | An oil production installation for a sub-sea station of modular design |
| GB2174442A (en) * | 1985-05-04 | 1986-11-05 | British Petroleum Co Plc | Subsea oil production system |
| GB2194980A (en) * | 1986-07-26 | 1988-03-23 | British Petroleum Co Plc | Control system for subsea oil production |
| GB2195686A (en) * | 1986-10-04 | 1988-04-13 | British Petroleum Co Plc | Subsea oil production system |
| GB2205877A (en) * | 1987-05-21 | 1988-12-21 | British Petroleum Co Plc | Insert choke and control module therefor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2242214A (en) * | 1990-03-19 | 1991-09-25 | Holta Leif | Replacement tool |
| US5161294A (en) * | 1990-03-19 | 1992-11-10 | Terje Haland | Tool device for use in replacing an instrument disposed in a normally inaccesible or dangerous environment |
| GB2242214B (en) * | 1990-03-19 | 1994-06-01 | Holta Leif | Apparatus and method for replacing a device locked in a housing |
| WO2001025083A1 (en) * | 1999-10-01 | 2001-04-12 | Richard Walker | Apparatus and method for positioning subaqueous articles |
| WO2013050411A3 (en) * | 2011-10-03 | 2013-12-19 | Aker Subsea As | Underwater vehicle docking station |
| CN104085517A (en) * | 2014-07-17 | 2014-10-08 | 泉州一露机械科技有限公司 | Maneuvering underwater diving chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8922227D0 (en) | 1989-11-15 |
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