EP2540956B1 - Blowout preventer and well intervention tool - Google Patents
Blowout preventer and well intervention tool Download PDFInfo
- Publication number
- EP2540956B1 EP2540956B1 EP11172161.9A EP11172161A EP2540956B1 EP 2540956 B1 EP2540956 B1 EP 2540956B1 EP 11172161 A EP11172161 A EP 11172161A EP 2540956 B1 EP2540956 B1 EP 2540956B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- tool
- blowout preventer
- well
- well head
- 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.)
- Not-in-force
Links
- 239000012530 fluid Substances 0.000 claims abstract description 49
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 11
- 239000003921 oil Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
- E21B33/064—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers specially adapted for underwater well heads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
- E21B33/076—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations
Definitions
- the present invention relates to a blowout preventer for being mounted on a well head, comprising a plurality of valves arranged in fluid communication with each other, connected and forming a tubular pipe enclosing a cavity being in fluid communication with the well head when the blowout preventer is mounted onto the well head and at least one plug in the well head has been removed. Furthermore, the invention relates to a well intervention tool and a well intervention system.
- the crown plugs Before intervening a well, the crown plugs need to be pulled in order to provide access to the well.
- the well may be situated 2000 metres below the surface of the sea, resulting in a substantial amount of pressure acting upon the plug to be pulled, said pressure often being larger than the pressure in the well.
- the tool for pulling the plug then has to provide a force overcoming the pressure from the water column above the plug and often also the drag force applied from the lower pressure in the well.
- Some pulling tools anchor up inside the lubricator connected to the BOP being on top of the well head.
- the amount of force applied by the anchors to the lubricator requires a redesign of the lubricator in order for the lubricator to be able to withstand such anchoring force.
- WO 2010/019378 discloses a plug removal system.
- a blowout preventer for being mounted on a well head, comprising:
- the pressure inside the blowout preventer can be substantially reduced, reducing the amount of force needed to pull the plug.
- the cavity may have a first pressure and the blowout preventer may further comprise a control device, such as a valve, for controlling the pressure in the cavity by letting fluid in the cavity into the first chamber part.
- a control device such as a valve
- the piston may be slidably arranged on a shaft arranged inside the chamber.
- the chamber may be connected with the cavity by means of a flow channel.
- the chamber can be arranged at a distance from the tubular part of the blowout preventer and is easily implemented in existing blowout preventers, and the control device can be mounted on the flow channel so that the control device can be operated by an ROV, or manually or even remotely.
- the blowout preventer as described above may further comprise a control unit comprising a storage device, and a communication unit for communicating with the control device.
- the blowout preventer as described above may comprise a sensor for sensing a pressure in the cavity.
- the present invention also relates to a well intervention tool intended to be arranged in a lubricator for pulling a plug in a top part of a well head of a well for entering the well, the well head having an axial extension, comprising:
- the stroking tool may further comprise a control device, such as a valve, for letting fluid in through the opening of the housing into the first chamber part.
- a control device such as a valve
- connection pulling unit may be a GS pulling tool.
- the piston may be slidably arranged on a shaft arranged inside the chamber.
- control device may be arranged in the opening.
- the stroking tool may be connected with the connection pulling unit by means of a stroker shaft.
- the fixating unit may comprise an anchoring section having anchors moving radially from the tool towards an inside wall of the lubricator.
- the fixating unit may be a tubular section surrounding part of the connection pulling tool for abutting a top part of the well head.
- the connection unit of the connection pulling unit may comprise latches for engaging inside the plug to be pulled.
- the blowout preventer according to the present invention may further comprise a control unit comprising the storage device, and a communication unit for communicating with the control device.
- the present invention relates to a well intervention system comprising:
- the lubricator may be closed off at a first end by a blind cap.
- the lubricator may comprise a lubricator valve arranged to close off the lubricator at a second end of the lubricator opposite a first end.
- a shear ram valve may be connected with the lubricator valve.
- the intervention system may comprise a disconnection unit arranged between the lubricator valve and the blowout preventer for disconnecting a part of the system.
- the intervention tool may comprise a driving section, such as a downhole tractor.
- the intervention tool may be wireless and driven only by an internal power source.
- Said intervention tool may comprise an inductive coupling for charging or recharging power.
- the intervention system may further comprise a vehicle which is remotely operated.
- Fig. 1 shows a blowout preventer 1 mounted to a top part 22 of the well head 2 arranged on the seabed on deep water.
- the blowout preventer 1 comprises a plurality of valves 3, 4 arranged on top of each other, and thus in fluid communication with each other.
- the first valve is an annular valve 3 and the other valve may be a ram valve 4.
- the valves 3, 4 are connected and form part of a tubular pipe 5.
- the tubular pipe is connected with the well head 2, and at the other end, the tubular pipe may be connected with a lubricator comprising a well intervention tool 100 illustrated by dotted lines.
- the tubular pipe 5 encloses a cavity 10 which is in fluid communication with the well head when the blowout preventer is 1 mounted onto the well head 2 and at least one plug 37 in the well head has been removed by means of an intervention tool 100.
- a lubricator 20 is arranged on top of the blowout preventer 1, said lubricator being arranged comprising the intervention tool capable of pulling the plug 37 and providing access to the well for a subsequent tool.
- the intervention tool 100 is powered by means of a wireline 24 extending through a grease injection head 21.
- the blowout preventer 1 further comprises a pressure reducing system in the form of a chamber 6 and a piston 7.
- the piston 7 is arranged inside the chamber dividing the chamber into a first chamber part 8 and a second chamber part 9.
- the first chamber part 8 is in fluid communication with the cavity and the second chamber part 9 is filled with a compressible fluid, such as gas.
- the chamber is connected with the tubular pipe by means of a flow channel 15 providing the fluid communication between the cavity and the first chamber part.
- a control device 11, such as a valve, is arranged in the flow channel 15 for controlling the flow of fluid into the first chamber part 8.
- the control device 11 is closed when the lubricator 20 is connecting and subsequently, the control device 11 is opened, hence letting fluid from the cavity into the first chamber part 8, decreasing the pressure inside the blowout preventer 1 and the lubricator 20.
- the force acting on the plug 37 is also decreased substantially and the plug 37 is thus easier to pull.
- the piston is slidably arranged on a shaft 12 which is also inside the chamber. In this way, the movement of the piston is controlled so that the piston does not tilt and jam if further movement of the piston is needed.
- the gas inside the second chamber part is compressed, increasing the volume of the first chamber part as it is filled with fluid.
- the capacity of the chamber is typically 5 litres, preferably 8 litres or more preferably 10 litres, or more.
- the control device 11 may also comprise a motor adjusting the control device or the position of the valve in order to let more or less fluid into the first chamber, or even stop the fluid from entering.
- the chamber By having a flow channel connecting the chamber with the cavity, the chamber can be arranged at a distance from the tubular part of the blowout preventer and is easily implemented in existing blowout preventers. Furthermore, the control device 11 can be mounted on the flow channel so that the control device can be operated by an ROV, or manually or even remotely.
- the blowout preventer 1 may further comprise a control unit comprising the storage device, and/or a communication unit for communicating with the control device.
- the blowout preventer 1 may further comprise a sensor for sensing a pressure in the cavity and the current pressure can be sent through the communication unit or stored for later use. Depending on the pressure, the control device is actuated to either let more fluid into the first chamber part 8 or decrease the flow thereto.
- Fig. 2 shows a well intervention tool 100 for pulling the plug 37, such as a crown plug, in a top part 23 of a well head 2 in order to be able to enter the well.
- the intervention tool 100 comprises a connection pulling unit 50, such as a GS pulling tool having a connection unit 51 matching the connection of the plug 37.
- the intervention tool 100 is arranged in a lubricator connected to the top of the blowout preventer 1.
- the intervention tool 100 comprises a fixation unit 54 for fixating the stroking tool 52 in relation to the well head 2 so that the axial movement of the stroking tool 52 pulls the plug 37 out of the well head 2.
- the fixation unit 54 comprises an anchoring section having anchors moving radially from the tool towards an inside wall of the lubricator 20 as shown in Fig. 2 .
- the fixation unit 54 comprises a tubular section surrounding part of the connection pulling tool for abutting the top part 23 of the well head 2 as shown in Fig. 3 .
- the stroking tool 52 comprises a tool housing in which a pressure reducing system in the form of a chamber 106 and a piston is arranged.
- the piston 107 is arranged in a sliding manner on a shaft 112 inside the chamber, dividing the chamber into a first chamber part 108 and a second chamber part 109.
- the first chamber part 108 is in fluid communication with an opening 113 in the tool housing 53 and thus in fluid communication with fluid in the lubricator.
- the second chamber part 109 is filled with a compressible fluid, such as gas.
- a compressible fluid such as gas.
- the stroking tool 52 further comprises a control device 111, such as a valve, for controlling the pressure in the lubricator by controlling the amount of fluid let into the first chamber part 108.
- a control device 111 such as a valve
- the piston moves and the gas in the second chamber part 109 is compressed and the pressure inside the lubricator is reduced.
- the pressure in the lubricator By reducing the pressure in the lubricator, the amount of force needed to pull the plug is also reduced substantially, and thus the anchoring force needed is reduced accordingly.
- a standard lubricator can be used to anchor up and the plug can thus be pulled by a stroking tool.
- connection of the plug 37 to be pulled comprises a female connection and the connection unit of the connection pulling unit 50 is shaped as a male connection with latches matching the female connection.
- the intervention tool 100 further comprises a stroking tool 52 connected to the connection pulling unit and providing an axial movement along the axial extension for moving the male connection unit into engagement with the female connection of the plug 37. Once the male-shaped connection unit 51 engages the female connection of the plug, the stroking tool moves a first part of the connection pulling unit 50 in relation to a second part in order to move the latches radially outwards.
- control device 111 is arranged in the opening 113, but may be arranged in any suitable manner.
- the stroking tool 52 is connected with the connection pulling unit 50 by means of a stroker shaft 55 and a threaded connection or a conventional male/female connection.
- the blowout preventer 1 may comprise a control unit comprising a storage device, and a communication unit for communicating with the control device. In this way, the control device 11 can be controlled from surface.
- Fig. 2 further shows a well intervention system 200 comprising any conventional blowout preventer or the blowout preventer mentioned above and a lubricator 20 connectable to the blowout preventer in which the intervention tool 100 is arranged in order to pull the plug 37.
- the intervention tool needs to pull two plugs which may be done in two runs.
- a second intervention tool inside a second lubricator may be arranged in the vicinity of the well head, ready to be connected when the first plug is pulled.
- the intervention system may comprise a disconnection unit arranged between a lubricator valve and the blowout preventer for disconnecting a part of the system, such as for disconnecting the lubricator and the intervention tool arranged inside the lubricator.
- the intervention tool may further comprise a driving section, such as a downhole tractor, in order to anchor the tool inside the lubricator. Due to a pressure reducing system 120, the intervention tool needs not be anchored as much as prior art tools.
- the intervention tool 100 may be wireless and driven only by an internal power source, such as a battery.
- the blowout preventer 1 may often be arranged in a supporting structure in the form of a frame structure, and together with the frame structure it forms an intervention module. Furthermore, the blowout preventer 1 comprising a control device on its outside enables a diver or the Remote Operational Vehicle (also called an ROV) to read and/or operate the control device in order to let fluid into the first chamber part 8, 108.
- a diver or the Remote Operational Vehicle also called an ROV
- the control device may comprise a receiving and/or transmitting unit so that the control device has data transmission capability to a remote operating centre.
- the remote operating centre may thus be located in the nearest town and still be able to control a park of wells, and thus well heads 2, without viewing the control device.
- the blowout preventer 1 may also comprise a control unit comprising a receiving and/or transmitting unit enabling the control unit to transmit data to and from a remote operating centre. Communicating with and receiving and/or transmitting data to and from the remote operating centre may take place by means of a satellite.
- a motor such as an electrical motor, may be arranged to operate the control device.
- a stroking tool is a tool providing an axial force.
- the stroking tool comprises an electrical motor for driving a pump.
- the pump pumps fluid into a piston housing to move a piston acting therein.
- the piston is arranged on the stroker shaft 55.
- the pump may pump fluid into the piston housing on one side and simultaneously suck fluid out on the other side of the piston.
- fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
- gas is meant any kind of gas composition present in a well, completion, or open hole
- oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
- Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
- a casing any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
- a downhole tractor can be used to push the tool all the way into position in the well.
- a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
Abstract
Description
- The present invention relates to a blowout preventer for being mounted on a well head, comprising a plurality of valves arranged in fluid communication with each other, connected and forming a tubular pipe enclosing a cavity being in fluid communication with the well head when the blowout preventer is mounted onto the well head and at least one plug in the well head has been removed. Furthermore, the invention relates to a well intervention tool and a well intervention system.
- Before intervening a well, the crown plugs need to be pulled in order to provide access to the well. The well may be situated 2000 metres below the surface of the sea, resulting in a substantial amount of pressure acting upon the plug to be pulled, said pressure often being larger than the pressure in the well. The tool for pulling the plug then has to provide a force overcoming the pressure from the water column above the plug and often also the drag force applied from the lower pressure in the well.
- Some pulling tools anchor up inside the lubricator connected to the BOP being on top of the well head. In order to provide the force needed to pull a plug in deep water wells, the amount of force applied by the anchors to the lubricator requires a redesign of the lubricator in order for the lubricator to be able to withstand such anchoring force.
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WO 2010/019378 discloses a plug removal system. - It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art. More specifically, it is an object to provide an improved blowout preventer or intervention tool making it easier to pull a plug in the well head or X-mass tree, such as a crown plug.
- The above objects, together with numerous other objects, advantages, and features, which will become evident from the below description, are accomplished by a solution in accordance with the present invention by a blowout preventer for being mounted on a well head, comprising:
- a plurality of valves arranged in fluid communication with each other, connected and forming a tubular pipe enclosing a cavity being in fluid communication with the well head when the blowout preventer is mounted onto the well head and when mounted at least one plug in the well head has been removed,
- By having such pressure reducing system in the form of the chamber and the piston, the pressure inside the blowout preventer can be substantially reduced, reducing the amount of force needed to pull the plug.
- Also, the cavity may have a first pressure and the blowout preventer may further comprise a control device, such as a valve, for controlling the pressure in the cavity by letting fluid in the cavity into the first chamber part.
- In one embodiment, the piston may be slidably arranged on a shaft arranged inside the chamber.
- Furthermore, the chamber may be connected with the cavity by means of a flow channel.
- Hereby, the chamber can be arranged at a distance from the tubular part of the blowout preventer and is easily implemented in existing blowout preventers, and the control device can be mounted on the flow channel so that the control device can be operated by an ROV, or manually or even remotely.
- The blowout preventer as described above may further comprise a control unit comprising a storage device, and a communication unit for communicating with the control device.
- Moreover, the blowout preventer as described above may comprise a sensor for sensing a pressure in the cavity.
- The present invention also relates to a well intervention tool intended to be arranged in a lubricator for pulling a plug in a top part of a well head of a well for entering the well, the well head having an axial extension, comprising:
- a connection pulling unit having a connection unit for connection to the plug,
- a stroking tool having a tool housing and being connected to the connection pulling unit and providing an axial movement along the axial extension, and
- a fixation unit for fixating the stroking tool in relation to the well head so that the axial movement of the stroking tool pulls the plug out of the well head,
- In one embodiment, the stroking tool may further comprise a control device, such as a valve, for letting fluid in through the opening of the housing into the first chamber part.
- Moreover, the connection pulling unit may be a GS pulling tool.
- Also, the piston may be slidably arranged on a shaft arranged inside the chamber.
- Furthermore, the control device may be arranged in the opening.
- In addition, the stroking tool may be connected with the connection pulling unit by means of a stroker shaft.
- In one embodiment, the fixating unit may comprise an anchoring section having anchors moving radially from the tool towards an inside wall of the lubricator.
- In another embodiment, the fixating unit may be a tubular section surrounding part of the connection pulling tool for abutting a top part of the well head. Further, the connection unit of the connection pulling unit may comprise latches for engaging inside the plug to be pulled.
- The blowout preventer according to the present invention may further comprise a control unit comprising the storage device, and a communication unit for communicating with the control device.
- Furthermore, the present invention relates to a well intervention system comprising:
- a blowout preventer according to the invention for connection onto a well head,
- a lubricator connectable to the blowout preventer, and
- an intervention tool according to the invention arranged inside the lubricator.
- In one embodiment, the lubricator may be closed off at a first end by a blind cap.
- In another embodiment, the lubricator may comprise a lubricator valve arranged to close off the lubricator at a second end of the lubricator opposite a first end.
- Moreover, a shear ram valve may be connected with the lubricator valve.
- Also, the intervention system may comprise a disconnection unit arranged between the lubricator valve and the blowout preventer for disconnecting a part of the system.
- Further, the intervention tool may comprise a driving section, such as a downhole tractor.
- Additionally, the intervention tool may be wireless and driven only by an internal power source.
- By having a wireless intervention tool, a grease connector head is not needed in the end of the lubricator.
- Said intervention tool may comprise an inductive coupling for charging or recharging power.
- Also, the intervention system may further comprise a vehicle which is remotely operated.
- The invention and its many advantages will be described in more detail below with reference to the accompanying schematic drawings, which for the purpose of illustration show some non-limiting embodiments and in which
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Fig. 1 shows a blowout preventer mounted on a well head, -
Fig. 2 shows a well intervention system comprising a well intervention tool mounted on the blowout preventer, and -
Fig. 3 shows another embodiment of the well intervention tool. - All the figures are highly schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the invention, other parts being omitted or merely suggested.
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Fig. 1 shows ablowout preventer 1 mounted to atop part 22 of the wellhead 2 arranged on the seabed on deep water. Theblowout preventer 1 comprises a plurality ofvalves annular valve 3 and the other valve may be aram valve 4. Thevalves tubular pipe 5. At the end closest to the rams, the tubular pipe is connected with thewell head 2, and at the other end, the tubular pipe may be connected with a lubricator comprising awell intervention tool 100 illustrated by dotted lines. Thus, thetubular pipe 5 encloses acavity 10 which is in fluid communication with the well head when the blowout preventer is 1 mounted onto thewell head 2 and at least oneplug 37 in the well head has been removed by means of anintervention tool 100. - A
lubricator 20 is arranged on top of theblowout preventer 1, said lubricator being arranged comprising the intervention tool capable of pulling theplug 37 and providing access to the well for a subsequent tool. Theintervention tool 100 is powered by means of awireline 24 extending through agrease injection head 21. - The
blowout preventer 1 further comprises a pressure reducing system in the form of achamber 6 and apiston 7. Thepiston 7 is arranged inside the chamber dividing the chamber into afirst chamber part 8 and asecond chamber part 9. Thefirst chamber part 8 is in fluid communication with the cavity and thesecond chamber part 9 is filled with a compressible fluid, such as gas. The chamber is connected with the tubular pipe by means of aflow channel 15 providing the fluid communication between the cavity and the first chamber part. Acontrol device 11, such as a valve, is arranged in theflow channel 15 for controlling the flow of fluid into thefirst chamber part 8. Thecontrol device 11 is closed when thelubricator 20 is connecting and subsequently, thecontrol device 11 is opened, hence letting fluid from the cavity into thefirst chamber part 8, decreasing the pressure inside theblowout preventer 1 and thelubricator 20. By decreasing the pressure inside theblowout preventer 1, the force acting on theplug 37 is also decreased substantially and theplug 37 is thus easier to pull. - By having a pressure reducing system in the form of a chamber with a piston, it is thus possible to equalise the pressure over the
well head 2, so that the pressure in theblowout preventer 1 can be adjusted to be substantially the same as the pressure in the well below the plug or plugs. - Inside the chamber, the piston is slidably arranged on a
shaft 12 which is also inside the chamber. In this way, the movement of the piston is controlled so that the piston does not tilt and jam if further movement of the piston is needed. When the fluid is let into the first chamber part, the gas inside the second chamber part is compressed, increasing the volume of the first chamber part as it is filled with fluid. - The capacity of the chamber is typically 5 litres, preferably 8 litres or more preferably 10 litres, or more.
- The
control device 11 may also comprise a motor adjusting the control device or the position of the valve in order to let more or less fluid into the first chamber, or even stop the fluid from entering. - By having a flow channel connecting the chamber with the cavity, the chamber can be arranged at a distance from the tubular part of the blowout preventer and is easily implemented in existing blowout preventers. Furthermore, the
control device 11 can be mounted on the flow channel so that the control device can be operated by an ROV, or manually or even remotely. - The
blowout preventer 1 may further comprise a control unit comprising the storage device, and/or a communication unit for communicating with the control device. Theblowout preventer 1 may further comprise a sensor for sensing a pressure in the cavity and the current pressure can be sent through the communication unit or stored for later use. Depending on the pressure, the control device is actuated to either let more fluid into thefirst chamber part 8 or decrease the flow thereto. -
Fig. 2 shows awell intervention tool 100 for pulling theplug 37, such as a crown plug, in atop part 23 of awell head 2 in order to be able to enter the well. Theintervention tool 100 comprises aconnection pulling unit 50, such as a GS pulling tool having a connection unit 51 matching the connection of theplug 37. When performing a pulling operation, theintervention tool 100 is arranged in a lubricator connected to the top of theblowout preventer 1. Theintervention tool 100 comprises afixation unit 54 for fixating the strokingtool 52 in relation to thewell head 2 so that the axial movement of the strokingtool 52 pulls theplug 37 out of thewell head 2. Thefixation unit 54 comprises an anchoring section having anchors moving radially from the tool towards an inside wall of thelubricator 20 as shown inFig. 2 . In another embodiment, thefixation unit 54 comprises a tubular section surrounding part of the connection pulling tool for abutting thetop part 23 of thewell head 2 as shown inFig. 3 . - The stroking
tool 52 comprises a tool housing in which a pressure reducing system in the form of achamber 106 and a piston is arranged. Thepiston 107 is arranged in a sliding manner on ashaft 112 inside the chamber, dividing the chamber into afirst chamber part 108 and asecond chamber part 109. Thefirst chamber part 108 is in fluid communication with anopening 113 in thetool housing 53 and thus in fluid communication with fluid in the lubricator. Thesecond chamber part 109 is filled with a compressible fluid, such as gas. In order to reduce the amount of force needed to pull aplug 37, the pressure inside the lubricator is reduced after the lubricator has been connected with thewell head 2. The strokingtool 52 further comprises acontrol device 111, such as a valve, for controlling the pressure in the lubricator by controlling the amount of fluid let into thefirst chamber part 108. By letting fluid from the lubricator into thefirst chamber part 108, the piston moves and the gas in thesecond chamber part 109 is compressed and the pressure inside the lubricator is reduced. By reducing the pressure in the lubricator, the amount of force needed to pull the plug is also reduced substantially, and thus the anchoring force needed is reduced accordingly. By reducing the anchoring force, a standard lubricator can be used to anchor up and the plug can thus be pulled by a stroking tool. - As shown in
Fig. 2 , the connection of theplug 37 to be pulled comprises a female connection and the connection unit of theconnection pulling unit 50 is shaped as a male connection with latches matching the female connection. Theintervention tool 100 further comprises a strokingtool 52 connected to the connection pulling unit and providing an axial movement along the axial extension for moving the male connection unit into engagement with the female connection of theplug 37. Once the male-shaped connection unit 51 engages the female connection of the plug, the stroking tool moves a first part of theconnection pulling unit 50 in relation to a second part in order to move the latches radially outwards. - As can be seen, the
control device 111 is arranged in theopening 113, but may be arranged in any suitable manner. - The stroking
tool 52 is connected with theconnection pulling unit 50 by means of astroker shaft 55 and a threaded connection or a conventional male/female connection. - The
blowout preventer 1 may comprise a control unit comprising a storage device, and a communication unit for communicating with the control device. In this way, thecontrol device 11 can be controlled from surface. -
Fig. 2 further shows awell intervention system 200 comprising any conventional blowout preventer or the blowout preventer mentioned above and alubricator 20 connectable to the blowout preventer in which theintervention tool 100 is arranged in order to pull theplug 37. Normally, the intervention tool needs to pull two plugs which may be done in two runs. A second intervention tool inside a second lubricator may be arranged in the vicinity of the well head, ready to be connected when the first plug is pulled. - The intervention system may comprise a disconnection unit arranged between a lubricator valve and the blowout preventer for disconnecting a part of the system, such as for disconnecting the lubricator and the intervention tool arranged inside the lubricator.
- The intervention tool may further comprise a driving section, such as a downhole tractor, in order to anchor the tool inside the lubricator. Due to a pressure reducing system 120, the intervention tool needs not be anchored as much as prior art tools. The
intervention tool 100 may be wireless and driven only by an internal power source, such as a battery. - The
blowout preventer 1 may often be arranged in a supporting structure in the form of a frame structure, and together with the frame structure it forms an intervention module. Furthermore, theblowout preventer 1 comprising a control device on its outside enables a diver or the Remote Operational Vehicle (also called an ROV) to read and/or operate the control device in order to let fluid into thefirst chamber part - The control device may comprise a receiving and/or transmitting unit so that the control device has data transmission capability to a remote operating centre. The remote operating centre may thus be located in the nearest town and still be able to control a park of wells, and thus well heads 2, without viewing the control device. The
blowout preventer 1 may also comprise a control unit comprising a receiving and/or transmitting unit enabling the control unit to transmit data to and from a remote operating centre. Communicating with and receiving and/or transmitting data to and from the remote operating centre may take place by means of a satellite. - A motor, such as an electrical motor, may be arranged to operate the control device.
- A stroking tool is a tool providing an axial force. The stroking tool comprises an electrical motor for driving a pump. The pump pumps fluid into a piston housing to move a piston acting therein. The piston is arranged on the
stroker shaft 55. The pump may pump fluid into the piston housing on one side and simultaneously suck fluid out on the other side of the piston. - By fluid or well fluid is meant any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc. By gas is meant any kind of gas composition present in a well, completion, or open hole, and by oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc. Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
- By a casing is meant any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
- In the event that the tool is not submergible all the way into the casing, a downhole tractor can be used to push the tool all the way into position in the well. A downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
- Although the invention has been described in the above in connection with preferred embodiments of the invention, it will be evident for a person skilled in the art that several modifications are conceivable without departing from the invention as defined by the following claims.
Claims (14)
- A blowout preventer (1) for being mounted on a well head (2), comprising:- a plurality of valves (3, 4) arranged in fluid communication with each other, connected and forming a tubular pipe (5) enclosing a cavity (10) being in fluid communication with the well head when the blowout preventer is mounted onto the well head and when mounted at least one plug (37) in the well head has been removed,characterized in that the blowout preventer further comprises a chamber (6) and a piston (7) arranged inside the chamber dividing the chamber into a first chamber part (8) and a second chamber part (9), the first chamber part being in fluid communication with the cavity and the second chamber part being filled with a compressible fluid, such as gas.
- A blowout preventer according to claim 1, wherein the cavity has a first pressure and the blowout preventer further comprises a control device (11), such as a valve, for controlling the pressure in the cavity by letting fluid in the cavity into the first chamber part.
- A blowout preventer according to claim 1 or 2, wherein the piston is slidably arranged on a shaft (12) arranged inside the chamber.
- A blowout preventer according to any of the proceeding claims, wherein the chamber is connected with the cavity by means of a flow channel (15).
- A blowout preventer according to any of the preceding claims, further comprising a control unit (38) comprising a storage device, and a communication unit for communicating with the control device.
- A blowout preventer according to any of the preceding claims, further comprising a sensor for sensing a pressure in the cavity.
- A well intervention tool (100) intended to be arranged in a lubricator for pulling a plug (37) in a top part (23) of a well head (2) of a well for entering the well, the well head having an axial extension, comprising:- a connection pulling unit (50) having a connection unit (51) for connection to the plug,- a stroking tool (52) having a tool housing (53) and being connected to the connection pulling unit and providing an axial movement along the axial extension, and- a fixation unit (54) for fixating the stroking tool in relation to the well head so that the axial movement of the stroking tool pulls the plug out of the well head,characterized in that the strocking toll comprises a chamber (106) and a piston (107) arranged inside the chamber dividing the chamber into a first chamber part (108) and a second chamber part (109), the first chamber part being in fluid communication with an opening (113) in the tool housing and the second chamber part being filled with a compressible fluid, such as gas.
- A well intervention tool (100) according to claim 7, wherein the stroking tool further comprises a control device (111), such as a valve, for letting fluid in through the opening of the housing into the first chamber part.
- A well intervention tool (100) according to claim 7 or 8 wherein the connection pulling unit is a GS pulling tool.
- A well intervention tool (100) according to any of the claims 7-9, wherein the piston is slidably arranged on a shaft (112) arranged inside the chamber.
- A well intervention tool (100) according to any of the claims 7-10, wherein the control device is arranged in the opening.
- A well intervention tool (100) according to any of the claims 7-11, wherein the stroking tool is connected with the connection pulling unit by means of a stroker shaft (55).
- A well intervention tool (100) according to any of the claims 7-12, wherein the fixating unit comprises an anchoring section having anchors moving radially from the tool towards an inside wall of the lubricator.
- A well intervention system (200) comprising:- a blowout preventer according to any of claims 1-6 for connection onto a well head,- a lubricator (20) connectable to the blowout preventer, and- an intervention tool (100) according to any of claims 7-13 arranged inside the lubricator.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11172161.9A EP2540956B1 (en) | 2011-06-30 | 2011-06-30 | Blowout preventer and well intervention tool |
DK11172161.9T DK2540956T3 (en) | 2011-06-30 | 2011-06-30 | Blowout preventer and well intervention tool |
AU2012286078A AU2012286078B2 (en) | 2011-06-30 | 2012-06-29 | Intervention blowout preventer and well intervention tool |
US14/130,191 US20140124686A1 (en) | 2011-06-30 | 2012-06-29 | Intervention blowout preventer and well intervention tool |
CN201280032459.9A CN103649454A (en) | 2011-06-30 | 2012-06-29 | Intervention blowout preventer and well intervention tool |
RU2014102490/03A RU2014102490A (en) | 2011-06-30 | 2012-06-29 | ANTI-EMISSION PREVENTOR FOR WORKING IN A WELL AND A TOOL FOR WORKING IN A WELL |
MX2013014574A MX2013014574A (en) | 2011-06-30 | 2012-06-29 | Intervention blowout preventer and well intervention tool. |
CA2840464A CA2840464A1 (en) | 2011-06-30 | 2012-06-29 | Intervention blowout preventer and well intervention tool |
PCT/EP2012/062699 WO2013010777A1 (en) | 2011-06-30 | 2012-06-29 | Intervention blowout preventer and well intervention tool |
BR112013033567A BR112013033567A2 (en) | 2011-06-30 | 2012-06-29 | intervention anti-eruption device and well intervention tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11172161.9A EP2540956B1 (en) | 2011-06-30 | 2011-06-30 | Blowout preventer and well intervention tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2540956A1 EP2540956A1 (en) | 2013-01-02 |
EP2540956B1 true EP2540956B1 (en) | 2013-12-18 |
Family
ID=46397287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11172161.9A Not-in-force EP2540956B1 (en) | 2011-06-30 | 2011-06-30 | Blowout preventer and well intervention tool |
Country Status (10)
Country | Link |
---|---|
US (1) | US20140124686A1 (en) |
EP (1) | EP2540956B1 (en) |
CN (1) | CN103649454A (en) |
AU (1) | AU2012286078B2 (en) |
BR (1) | BR112013033567A2 (en) |
CA (1) | CA2840464A1 (en) |
DK (1) | DK2540956T3 (en) |
MX (1) | MX2013014574A (en) |
RU (1) | RU2014102490A (en) |
WO (1) | WO2013010777A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8322443B2 (en) * | 2010-07-29 | 2012-12-04 | Vetco Gray Inc. | Wellhead tree pressure limiting device |
NO340498B1 (en) * | 2014-01-28 | 2017-05-02 | Qinterra Tech As | Method and device for activating and deactivating a GS tool |
US9874068B2 (en) | 2014-08-08 | 2018-01-23 | Wright's Well Control Services, Llc | Apparatus and method usable for open-water rigless and riserless plug and abandonment (P and A) work |
US10363651B2 (en) * | 2015-09-28 | 2019-07-30 | Caterpillar Inc. | Hammer assembly |
US10392894B2 (en) | 2017-11-22 | 2019-08-27 | Fhe Usa Llc | Remotely operated ball drop and night cap removal device for wellhead pressure control apparatus |
US11174692B2 (en) * | 2018-02-23 | 2021-11-16 | Halliburton Energy Services, Inc. | Crown plug pulling tool with bailer feature |
US11391106B2 (en) | 2018-03-05 | 2022-07-19 | Gr Energy Services Management, Lp | Nightcap assembly for closing a wellhead and method of using same |
CN110368787B (en) * | 2019-07-24 | 2021-08-06 | 无锡市道格环保科技有限公司 | Ozone denitration sprays mixing device |
Family Cites Families (21)
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US5074518A (en) * | 1990-11-02 | 1991-12-24 | Hydratech | Proportional annular B.O.P. controller |
US6164619A (en) * | 1999-01-07 | 2000-12-26 | Tuboscope I/P, Inc. | Bi-directional sealing ram |
US7578349B2 (en) * | 2001-03-08 | 2009-08-25 | Worldwide Oilfield Machine, Inc. | Lightweight and compact subsea intervention package and method |
US6719059B2 (en) * | 2002-02-06 | 2004-04-13 | Abb Vetco Gray Inc. | Plug installation system for deep water subsea wells |
US7121344B2 (en) * | 2003-01-10 | 2006-10-17 | Vetco Gray Inc. | Plug installation system for deep water subsea wells |
GB0409189D0 (en) * | 2004-04-24 | 2004-05-26 | Expro North Sea Ltd | Plug setting and retrieving apparatus |
US7380590B2 (en) * | 2004-08-19 | 2008-06-03 | Sunstone Corporation | Rotating pressure control head |
GB0500813D0 (en) * | 2005-01-15 | 2005-02-23 | Expro North Sea Ltd | Purge system |
US7424917B2 (en) * | 2005-03-23 | 2008-09-16 | Varco I/P, Inc. | Subsea pressure compensation system |
NO324579B1 (en) * | 2005-12-08 | 2007-11-26 | Fmc Kongsberg Subsea As | Plug pulling tool |
GB0615134D0 (en) * | 2006-07-29 | 2006-09-06 | Expro North Sea Ltd | Purge system |
GB0721350D0 (en) * | 2007-10-31 | 2007-12-12 | Expro North Sea Ltd | Object manoeuvring apparatus |
US20090151956A1 (en) * | 2007-12-12 | 2009-06-18 | John Johansen | Grease injection system for riserless light well intervention |
US7735564B2 (en) * | 2007-12-21 | 2010-06-15 | Schlumberger Technology Corporation | Logging tool deployment systems and methods with pressure compensation |
WO2010019378A2 (en) * | 2008-08-13 | 2010-02-18 | Schlumberger Technology Corporation | Plug removal and setting system and method |
GB0816898D0 (en) * | 2008-09-16 | 2008-10-22 | Enovate Systems Ltd | Improved subsea apparatus |
WO2010065993A1 (en) * | 2008-12-08 | 2010-06-17 | Well Ops Sea Pty Ltd | Removal/fitting of subsea sealing plug(s) |
AU2010302483B2 (en) * | 2009-10-01 | 2015-10-29 | Enovate Systems Limited | Improved flushing system |
US8322443B2 (en) * | 2010-07-29 | 2012-12-04 | Vetco Gray Inc. | Wellhead tree pressure limiting device |
US20120043089A1 (en) * | 2010-08-17 | 2012-02-23 | Corey Eugene Hoffman | Retrieving a subsea tree plug |
US8869899B2 (en) * | 2011-02-21 | 2014-10-28 | Tetra Technologies, Inc. | Method for pulling a crown plug |
-
2011
- 2011-06-30 DK DK11172161.9T patent/DK2540956T3/en active
- 2011-06-30 EP EP11172161.9A patent/EP2540956B1/en not_active Not-in-force
-
2012
- 2012-06-29 WO PCT/EP2012/062699 patent/WO2013010777A1/en active Application Filing
- 2012-06-29 CA CA2840464A patent/CA2840464A1/en not_active Abandoned
- 2012-06-29 CN CN201280032459.9A patent/CN103649454A/en active Pending
- 2012-06-29 AU AU2012286078A patent/AU2012286078B2/en not_active Ceased
- 2012-06-29 BR BR112013033567A patent/BR112013033567A2/en not_active IP Right Cessation
- 2012-06-29 US US14/130,191 patent/US20140124686A1/en not_active Abandoned
- 2012-06-29 MX MX2013014574A patent/MX2013014574A/en not_active Application Discontinuation
- 2012-06-29 RU RU2014102490/03A patent/RU2014102490A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
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WO2013010777A1 (en) | 2013-01-24 |
AU2012286078B2 (en) | 2015-02-19 |
CA2840464A1 (en) | 2013-01-24 |
CN103649454A (en) | 2014-03-19 |
BR112013033567A2 (en) | 2017-02-07 |
US20140124686A1 (en) | 2014-05-08 |
DK2540956T3 (en) | 2014-03-24 |
RU2014102490A (en) | 2015-08-10 |
EP2540956A1 (en) | 2013-01-02 |
AU2012286078A1 (en) | 2013-05-02 |
MX2013014574A (en) | 2014-03-21 |
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