US20050121188A1 - Controlling a fluid well - Google Patents
Controlling a fluid well Download PDFInfo
- Publication number
- US20050121188A1 US20050121188A1 US10/887,769 US88776904A US2005121188A1 US 20050121188 A1 US20050121188 A1 US 20050121188A1 US 88776904 A US88776904 A US 88776904A US 2005121188 A1 US2005121188 A1 US 2005121188A1
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- Prior art keywords
- power
- drive means
- control
- control signals
- power supply
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- 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.)
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- 239000012530 fluid Substances 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000011439 discrete element method Methods 0.000 description 8
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 230000009021 linear effect Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002459 sustained effect Effects 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- 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
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/0355—Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
Definitions
- the present invention relates to controlling a fluid well, such as a hydrocarbon extraction well.
- the communication system is generally bi-directional in that not only are control signals to the fluid control devices required, but the outputs of sensors, such as pressure, temperature and flow sensors, are also required to be transmitted to the surface platform to provide the operator with well operation data.
- sensors such as pressure, temperature and flow sensors
- Well operators require high availability and reliability for both the power supply and the communication systems and in an effort to achieve this, the power feed, with its superimposed control and sensing signals, is duplicated within the umbilical, or even by a second umbilical, with further duplication of electronic modules in the control pod.
- future wells will use fluid control devices such as chokes which have dual redundant operating mechnisms that employ both an electrical and hydraulic drive, such that if one fails the other is still operable.
- apparatus for controlling a fluid well comprising, a control device for location downhole and operable selectively by first and second drive means, there being first and second power supply means and first and second control channels for control signals for the first and second drive means, the arrangement being such that if one of the power supplies fails, the respective drive means is operable via the other power supply, the apparatus further comprising first and second means for routing control signals from the first and second channels respectively to the first and second drive means, the routing means being cross-connected so that, in the event of a fault, control signals from the second channel are routed via the first routing means to the second drive means and/or control signals from the first channel are routed via the second routing means to the first drive means.
- apparatus for controlling a fluid production well comprising:
- FIG. 1 shows a known form of choke drive assembly for a hydrocarbon extraction well
- FIG. 2 shows a modification of what is shown in FIG. 1 , being an example of the present invention
- FIG. 3 shows in more detail one of the electronic modules of FIG. 2 ;
- FIGS. 4 and 5 show the switching of relays in modules for two chokes.
- FIG. 6 shows how redundancy is provided in control channels in an example of the present invention.
- FIG. 1 shows, diagrammatically, a known form of drive assembly for a fluid control device, typically a choke, mounted downhole in a hydrocarbon extraction well.
- the output of the drive is a shaft 1 with a linear motion which operates the fluid control device D, typically a choke having a sliding slotted sleeve that controls fluid flow.
- the linear action of the shaft 1 is derived from the rotary motion of a motor via a screw arrangement.
- the assembly (as in GB 2350659) has two motors 2 and 3 coupled with a mechanism 4 , that provides the required linear output from the shaft 1 from either motor.
- the two motors provide greater availability in the event of the failure of one of them and are controlled and powered via separate feeds from a control system at a surface platform to the well.
- motor 2 is electric and motor 3 is hydraulic, thus continuing to provide availability in the case of failure of either the electric or hydraulic power sources or their feeds.
- the control of both the electric motor 2 and the hydraulic motor 3 is through an electronic communication system.
- a hydraulic power supply on a line 5 is switched to the motor 3 by a DCV 6 , electrically operated by a downhole electronics module (DEM) 7 .
- the DEM 7 recognises and acts upon a digital message received from the control system via one of the feeds through an umbilical which is designated ‘Channel B’ (Ch B).
- Electric power to the DEM 7 is provided by a power supply unit (PSU) 8 which is provided with electric power via the same umbilical and is designated ‘Power B’
- an embodiment of the invention modifies the DEMs of FIG. 1 as shown in FIG. 2 , by the addition of power supply selection and isolation relay assemblies, the cross-connection between drives of the power supply units (PSUs), the feeding of both ‘Power A’ and ‘Power B’ to the relay assemblies and the feeding of both control channels Channel A and Channel B to the DEMs.
- PSUs power supply units
- a modified DEM 1 for DCV 6 now includes a relay assembly 12 and likewise a modified DEM 13 for motor 2 includes a relay assembly 14 .
- Power from PSU 8 is applied to DEM 13 and power from PSU 10 is applied to DEM 1 , the latter using one of ‘Power A’ and ‘Power B’ and DEM 13 using the other of ‘Power A’ and ‘Power B’ in normal operation. Since the normal operation of the system is to operate each of the two drives from a different one of the two power sources, the cross-connected PSUs allow for selection of an alternative power source by a DEM.
- the reason for the cross-connection of the PSUs 8 and 10 is to retain operation of the control to enable switching to an alternative power supply source in the event of failure of either a power source or a PSU.
- PSU 10 powers the control logic electronics within DEM 13 (rather than DEM 11 ) which controls the selection of ‘Power A’ or ‘Power B’ by the relay unit 14 to feed the PSU 10 .
- ‘Power A’ is powering the system. Now, if PSU 10 fails then the power to the control logic electronics in DEM 13 would disappear and thus it would be unable to select, as an alternative, ‘Power B’ to continue operation.
- FIG. 3 shows the arrangement of the relays in the relay assembly of a modified DEM, i.e. item 12 or 14 of FIG. 2 .
- a latching relay 15 provides selection of the power supply, i.e. ‘Power A’ or ‘Power B’, under the control of the electronic part of the DEM.
- a latching relay 16 provides switching or isolation of the power feed output to another relay assembly on another choke.
- a latching relay 17 provides switching or isolation of power to the PSU, i.e. item 8 or 10 of FIG. 2 .
- the choke carries two DEMs.
- the relay assemblies are connected as illustrated in FIG. 4 .
- FIG. 4 shows relay assemblies 18 a and 19 a for a choke 20 and 18 b and 19 b for a choke 21 .
- Power supplies, ‘Power A’ and ‘Power B’, are connected to and routed through the two DEM relay assemblies as shown.
- the two output isolation relays 16 a of assemblies 18 a and 19 a respectively are connected to an identical arrangement of relay assemblies in the second choke 21 .
- FIG. 4 shows clearly which electronic section of the DEMs ( 11 a and 13 a for choke 20 and 11 b and 13 b for choke 21 ) controls each relay.
- the versatility of control and isolation allows availability of power to at least one of the choke drives in the event of a single power source failure or interconnection failure as illustrated by the example in FIG. 5 .
- FIG. 5 shows, as an example, how power can be sustained to both DEMs in the second choke 21 , and any subsequent chokes (not shown in the figure), in the event of a short or open circuit of an electrical link 22 between the two chokes.
- a digital control message is sent to the DEM 11 a in choke 20 which operates relay 16 a in the relay assembly 19 a in the choke 20 .
- Operation of relay 16 a isolates choke 21 from the faulty link.
- This action is followed by a digital control message being sent to the DEM 11 b in choke 21 which operates the relay 15 b in relay assembly 19 b of choke 21 .
- FIG. 6 shows a typical arrangement for the architecture of the communications system of a subsea well.
- Communication from the surface platform is duplicated via the umbilical (or via two umbilicals) as Ch A and Ch B.
- communication data is transmitted on the power feed and then extracted at the duplicated subsea electronic modules (SEM) 25 located on the well tree on the sea bed.
- SEM subsea electronic modules
- the data is then transformed into the format required to communicate downhole to the choke drives by the interface units 26 .
- Each choke has two DEMs (DEM 1 A and DEM 1 B) which contain electronic circuitry that reconfigures the architecture in the case of a fault. These circuits are integrated into integrated circuits, each with four ports P 0 , P 1 , P 2 , P 3 .
- each DEM will repeat data from the DEM above it, to the DEM below it, i.e. from port P 0 to P 3 .
- each DEM will repeat data from the DEM below it to the DEM above, i.e. from port P 3 to P 0 .
- Data that is repeated on port P 3 of DEMs 3 A and 3 B can be ignored.
- each DEM will actually receive data on two ports. However, the data is delayed by an extra 1.5 bits from the companion DEM and is then not used unless there is a fault.
- DEM 2 A receives its data on P 2 from DEM 2 B.
- DEM 2 A will continue to re-transmit to P 3 and P 1 , so data arrives at DEM 3 A port P 0 .
- DEM 2 B receives its data on P 2 from DEM 2 A.
- DEM 2 B will continue to re-transmit to P 3 and P 1 so data arrives at DEM 3 B port P 0 .
- the local cross links in each choke are not in a high stress environment and are thus unlikely to fail. It follows that any single fault between chokes is tolerated and that multiple faults are also tolerated, provided there is only one fault between chokes.
- the combination of the described power and communication architecture substantially improves fault tolerance in the electrical control of subsea wells.
Abstract
Description
- This application claims the benefit of United Kingdom Patent Application No. 0328440.3, filed on Dec. 9, 2003, which hereby is incorporated by reference in its entirety.
- The present invention relates to controlling a fluid well, such as a hydrocarbon extraction well.
- Subsea hydrocarbon extraction wells are controlled, typically, by hydraulically powered valves and fluid control chokes, downhole, with the control of the hydraulic power to such devices being effected by directional control valves (DCVs) which are electrically operated. The DCVs are typically housed in a control pod mounted on a well tree located on the sea bed above the well production tubing. The DCVs are, in turn, controlled by electronics, housed in a subsea electronics module (SEM) located in the control pod. The SEM is supplied with both electric power and control signals via an umbilical from a sea surface platform. Modern systems typically send the control signals by a communication system which superimposes them on the power feeds. The communication system is generally bi-directional in that not only are control signals to the fluid control devices required, but the outputs of sensors, such as pressure, temperature and flow sensors, are also required to be transmitted to the surface platform to provide the operator with well operation data. Well operators require high availability and reliability for both the power supply and the communication systems and in an effort to achieve this, the power feed, with its superimposed control and sensing signals, is duplicated within the umbilical, or even by a second umbilical, with further duplication of electronic modules in the control pod. Furthermore, future wells will use fluid control devices such as chokes which have dual redundant operating mechnisms that employ both an electrical and hydraulic drive, such that if one fails the other is still operable.
- However, these techniques only provide a limited protection against failure, with the situation becoming much more serious when a plurality of fluid control chokes are fitted to a well, as is the trend in modern wells.
- According to the present invention from one aspect, there is provided apparatus for controlling a fluid well comprising, a control device for location downhole and operable selectively by first and second drive means, there being first and second power supply means and first and second control channels for control signals for the first and second drive means, the arrangement being such that if one of the power supplies fails, the respective drive means is operable via the other power supply, the apparatus further comprising first and second means for routing control signals from the first and second channels respectively to the first and second drive means, the routing means being cross-connected so that, in the event of a fault, control signals from the second channel are routed via the first routing means to the second drive means and/or control signals from the first channel are routed via the second routing means to the first drive means.
- According to the present invention from another aspect, there is provided apparatus for controlling a fluid production well, comprising:
-
- a) a control device for location downhole;
- b) first drive means for operating the control device;
- c) second drive means for operating the control device, the control device being operable selectively by the first and second drive means;
- d) first power supply means;
- e) second power supply means;
- f) a first control channel, for control signals for the first drive means;
- g) a second control channel, for control signals for the second drive means;
- h) first switching means, for switching power and control signals to the first drive means; and
- i) second switching means, for switching power and control signals to the second drive means; wherein
- i) the first and second power supply means and the first and second control channels are connected to the first switching means and also to the second switching means, the arrangement being such that, in normal operation, power from the first power supply means powers the first drive means via the first switching means and power from the second power supply means powers the second drive means via the second switching means, and in the event of a fault, power from the first power supply means powers the second drive means or power from the second power supply means powers the first drive means; and
- ii) the first switching means includes means for routing control signals from the first control channel to control the first drive means and the second switching means includes means for routing control signals from the second control channel to control the second drive means, the first and second routing means being cross-connected so that, in the event of a fault, control signals from the second channel are routed via the first routing means to the second drive means and/or control signals from the first channel are routed via the second routing means to the first drive means.
- The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
-
FIG. 1 shows a known form of choke drive assembly for a hydrocarbon extraction well; -
FIG. 2 shows a modification of what is shown inFIG. 1 , being an example of the present invention; -
FIG. 3 shows in more detail one of the electronic modules ofFIG. 2 ; -
FIGS. 4 and 5 show the switching of relays in modules for two chokes; and -
FIG. 6 shows how redundancy is provided in control channels in an example of the present invention. -
FIG. 1 shows, diagrammatically, a known form of drive assembly for a fluid control device, typically a choke, mounted downhole in a hydrocarbon extraction well. The output of the drive is ashaft 1 with a linear motion which operates the fluid control device D, typically a choke having a sliding slotted sleeve that controls fluid flow. The linear action of theshaft 1 is derived from the rotary motion of a motor via a screw arrangement. The assembly (as in GB 2350659) has twomotors mechanism 4, that provides the required linear output from theshaft 1 from either motor. The two motors provide greater availability in the event of the failure of one of them and are controlled and powered via separate feeds from a control system at a surface platform to the well. In the example shown,motor 2 is electric andmotor 3 is hydraulic, thus continuing to provide availability in the case of failure of either the electric or hydraulic power sources or their feeds. The control of both theelectric motor 2 and thehydraulic motor 3 is through an electronic communication system. - In the case of the
hydraulic motor 3, a hydraulic power supply on aline 5 is switched to themotor 3 by aDCV 6, electrically operated by a downhole electronics module (DEM) 7. TheDEM 7 recognises and acts upon a digital message received from the control system via one of the feeds through an umbilical which is designated ‘Channel B’ (Ch B). Electric power to theDEM 7 is provided by a power supply unit (PSU) 8 which is provided with electric power via the same umbilical and is designated ‘Power B’ - Likewise, in the case of the electric drive, the
motor 2 is operated directly by another DEM 9, which recognises and acts upon a digital message received from the control system via another feed in the umbilical and is designated ‘Channel A’ (Ch A). Electric power to the DEM 9 is provided by aPSU 10 which is fed with electric power via the same umbilical and is designated ‘Power A’. - Although the known system described above provides considerable redundancy, it could be considered as less than adequate when a plurality of fluid control devices D such as chokes are fitted downhole, in that a failure of electrical links between the devices could render the well inoperative. Thus, a system is desired that continues to provide redundancy in the event of such failures. Since both control signals and electric power are equally important in sustaining well control, this invention provides a solution to the failure of either or both.
- In order to provide redundancy of power supply, an embodiment of the invention modifies the DEMs of
FIG. 1 as shown inFIG. 2 , by the addition of power supply selection and isolation relay assemblies, the cross-connection between drives of the power supply units (PSUs), the feeding of both ‘Power A’ and ‘Power B’ to the relay assemblies and the feeding of both control channels Channel A and Channel B to the DEMs. - Referring to
FIG. 2 , a modifiedDEM 1 forDCV 6 now includes arelay assembly 12 and likewise a modifiedDEM 13 formotor 2 includes arelay assembly 14. Power from PSU8 is applied toDEM 13 and power fromPSU 10 is applied toDEM 1, the latter using one of ‘Power A’ and ‘Power B’ andDEM 13 using the other of ‘Power A’ and ‘Power B’ in normal operation. Since the normal operation of the system is to operate each of the two drives from a different one of the two power sources, the cross-connected PSUs allow for selection of an alternative power source by a DEM. - The reason for the cross-connection of the
PSUs relay unit 14 to feed thePSU 10. Also assume that ‘Power A’ is powering the system. Now, ifPSU 10 fails then the power to the control logic electronics inDEM 13 would disappear and thus it would be unable to select, as an alternative, ‘Power B’ to continue operation. By cross-connecting thePSUs DEM 13 operates therelay unit 14 such thatPSU 10 is fed with, say, ‘Power A’ and the control logic electronics withinDEM 11 operates therelay unit 12 such that thePSU 8 is fed with ‘Power B’, then, in the event of either a PSU or power source failure, the control logic elements are still powered by the other source and thus able to continue to receive commands to switch the power source to sustain operation of at least one drive. -
FIG. 3 shows the arrangement of the relays in the relay assembly of a modified DEM,i.e. item FIG. 2 . Alatching relay 15 provides selection of the power supply, i.e. ‘Power A’ or ‘Power B’, under the control of the electronic part of the DEM. Alatching relay 16 provides switching or isolation of the power feed output to another relay assembly on another choke. Alatching relay 17 provides switching or isolation of power to the PSU,i.e. item FIG. 2 . - As shown in
FIG. 2 , the choke carries two DEMs. When there is a plurality of chokes in a well, the relay assemblies are connected as illustrated inFIG. 4 .FIG. 4 shows relayassemblies 18 a and 19 a for achoke 20 and 18 b and 19 b for achoke 21. Power supplies, ‘Power A’ and ‘Power B’, are connected to and routed through the two DEM relay assemblies as shown. The two output isolation relays 16 a ofassemblies 18 a and 19 a respectively are connected to an identical arrangement of relay assemblies in thesecond choke 21.FIG. 4 shows clearly which electronic section of the DEMs (11 a and 13 a forchoke FIG. 5 . -
FIG. 5 shows, as an example, how power can be sustained to both DEMs in thesecond choke 21, and any subsequent chokes (not shown in the figure), in the event of a short or open circuit of anelectrical link 22 between the two chokes. With such a failure, a digital control message is sent to theDEM 11 a inchoke 20 which operatesrelay 16 a in therelay assembly 19 a in thechoke 20. Operation ofrelay 16 a isolates choke 21 from the faulty link. This action is followed by a digital control message being sent to theDEM 11 b inchoke 21 which operates therelay 15 b in relay assembly 19 b ofchoke 21. This reconnects power from the ‘Power A’ so that both drives continue to operate inchoke 21. - It follows from analysis of the circuit that the failure of any one power link between the chokes or a failure of a power source can be circumvented by suitable operation of the appropriate relays. However this power supply architecture is of limited value unless the same versatility is available, in the event of a failure, for the communication links that control the relays and command the choke drive operation.
-
FIG. 6 shows a typical arrangement for the architecture of the communications system of a subsea well. Communication from the surface platform is duplicated via the umbilical (or via two umbilicals) as Ch A and Ch B. Typically, communication data is transmitted on the power feed and then extracted at the duplicated subsea electronic modules (SEM) 25 located on the well tree on the sea bed. The data is then transformed into the format required to communicate downhole to the choke drives by theinterface units 26. Each choke has two DEMs (DEM 1A andDEM 1B) which contain electronic circuitry that reconfigures the architecture in the case of a fault. These circuits are integrated into integrated circuits, each with four ports P0, P1, P2, P3. - Under normal, no fault, conditions the communications operates in ‘loop mode’, with simplex traffic, of frames of data with a token system. Each integrated circuit operates such that an input to P0 is retransmitted from both P0 and P3, and an input to P3 is retransmitted from P3 and P0. Thus communication is passed round the loop such that any choke can be operated from one channel or the other, in the event of a failure of one link between the chokes.
- However, a much improved fault tolerant system is achieved by additional features in the integrated circuits with the ports cross-connected as shown. In the event of a fault, the integrated circuits are commanded to operate in half duplex mode and communicate as to the table below.
RECEIVE ON REPLY ON RE-TRANSMIT ON P0 P0 P3 P1 P1 P1 P2 P0 P2 P2 P3 P1 P3 P3 P2 P0 - Thus in the half duplex mode each DEM will repeat data from the DEM above it, to the DEM below it, i.e. from port P0 to P3. Similarly, each DEM will repeat data from the DEM below it to the DEM above, i.e. from port P3 to P0. Data that is repeated on port P3 of
DEMs - Because of the local cross-loop in each choke, each DEM will actually receive data on two ports. However, the data is delayed by an extra 1.5 bits from the companion DEM and is then not used unless there is a fault. Thus, for example, if there is a fault in the cable (short or open circuit) between
DEM 1A and DEM 2A, then DEM 2A receives its data on P2 from DEM 2B. DEM 2 A will continue to re-transmit to P3 and P1, so data arrives atDEM 3 A port P0. Similarly, if a fault occurs betweenDEM 1B and DEM 2B, then DEM 2B receives its data on P2 from DEM 2A. DEM 2B will continue to re-transmit to P3 and P1 so data arrives atDEM 3B port P0. It should be noted that the local cross links in each choke are not in a high stress environment and are thus unlikely to fail. It follows that any single fault between chokes is tolerated and that multiple faults are also tolerated, provided there is only one fault between chokes. - The combination of the described power and communication architecture substantially improves fault tolerance in the electrical control of subsea wells.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0328440A GB2408987B (en) | 2003-12-09 | 2003-12-09 | Controlling a fluid well |
GB0328440.3 | 2003-12-09 |
Publications (1)
Publication Number | Publication Date |
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US20050121188A1 true US20050121188A1 (en) | 2005-06-09 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/887,769 Abandoned US20050121188A1 (en) | 2003-12-09 | 2004-07-09 | Controlling a fluid well |
Country Status (5)
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US (1) | US20050121188A1 (en) |
EP (1) | EP1702136B1 (en) |
GB (2) | GB2408987B (en) |
NO (1) | NO20061428L (en) |
WO (1) | WO2005056980A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011060802A1 (en) * | 2009-11-19 | 2011-05-26 | Cameron International Corporation | Control and supply unit |
WO2014116200A1 (en) | 2013-01-22 | 2014-07-31 | Halliburton Energy Services, Inc. | Cross-communication between electronic circuits and electrical devices in well tools |
GB2545197A (en) * | 2015-12-08 | 2017-06-14 | Aker Solutions As | Workover safety system |
US10704352B2 (en) | 2015-12-08 | 2020-07-07 | Aker Solutions As | Safety system for overriding hydrocarbon control module |
CN113359408A (en) * | 2021-04-13 | 2021-09-07 | 中国石油大学(华东) | Full-electric-control intelligent redundancy control system for underground safety valve |
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Publication number | Priority date | Publication date | Assignee | Title |
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CA2581581C (en) | 2006-11-28 | 2014-04-29 | T-3 Property Holdings, Inc. | Direct connecting downhole control system |
US8196649B2 (en) | 2006-11-28 | 2012-06-12 | T-3 Property Holdings, Inc. | Thru diverter wellhead with direct connecting downhole control |
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GB2387977B (en) * | 2002-04-17 | 2005-04-13 | Abb Offshore Systems Ltd | Control of hydrocarbon wells |
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2003
- 2003-12-09 GB GB0328440A patent/GB2408987B/en not_active Expired - Lifetime
- 2003-12-09 GB GB0611818A patent/GB2427221B/en not_active Expired - Lifetime
-
2004
- 2004-07-09 US US10/887,769 patent/US20050121188A1/en not_active Abandoned
- 2004-11-25 WO PCT/GB2004/004961 patent/WO2005056980A1/en active IP Right Grant
- 2004-11-25 EP EP04798666A patent/EP1702136B1/en not_active Expired - Fee Related
-
2006
- 2006-03-29 NO NO20061428A patent/NO20061428L/en unknown
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US3404856A (en) * | 1961-11-14 | 1968-10-08 | Boeing Co | Automatic stabilization of aircraft |
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US6149683A (en) * | 1998-10-05 | 2000-11-21 | Kriton Medical, Inc. | Power system for an implantable heart pump |
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Cited By (10)
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WO2011060802A1 (en) * | 2009-11-19 | 2011-05-26 | Cameron International Corporation | Control and supply unit |
GB2488719A (en) * | 2009-11-19 | 2012-09-05 | Cameron Int Corp | Control and supply unit |
GB2488719B (en) * | 2009-11-19 | 2013-07-17 | Cameron Int Corp | Control and supply unit |
US9376894B2 (en) | 2009-11-19 | 2016-06-28 | Onesubsea Ip Uk Limited | Control and supply unit |
WO2014116200A1 (en) | 2013-01-22 | 2014-07-31 | Halliburton Energy Services, Inc. | Cross-communication between electronic circuits and electrical devices in well tools |
EP2909442A4 (en) * | 2013-01-22 | 2016-07-06 | Halliburton Energy Services Inc | Cross-communication between electronic circuits and electrical devices in well tools |
GB2545197A (en) * | 2015-12-08 | 2017-06-14 | Aker Solutions As | Workover safety system |
GB2545197B (en) * | 2015-12-08 | 2019-02-20 | Aker Solutions As | Workover safety system |
US10704352B2 (en) | 2015-12-08 | 2020-07-07 | Aker Solutions As | Safety system for overriding hydrocarbon control module |
CN113359408A (en) * | 2021-04-13 | 2021-09-07 | 中国石油大学(华东) | Full-electric-control intelligent redundancy control system for underground safety valve |
Also Published As
Publication number | Publication date |
---|---|
EP1702136B1 (en) | 2008-03-19 |
GB0611818D0 (en) | 2006-07-26 |
EP1702136A1 (en) | 2006-09-20 |
GB2427221B (en) | 2007-02-07 |
GB2408987B (en) | 2006-11-15 |
GB2408987A (en) | 2005-06-15 |
NO20061428L (en) | 2006-09-08 |
WO2005056980A1 (en) | 2005-06-23 |
GB0328440D0 (en) | 2004-01-14 |
GB2427221A (en) | 2006-12-20 |
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Owner name: VETCO GRAY CONTROLS LIMITED, UNITED KINGDOM Free format text: CHANGE OF NAME;ASSIGNOR:ABB OFFSHORE SYSTEMS LIMITED;REEL/FRAME:015878/0405 Effective date: 20040730 |
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Owner name: VETCO GRAY CONTROLS LIMITED, UNITED KINGDOM Free format text: CHANGE OF NAME;ASSIGNOR:ABB OFFSHORE SYSTEMS LIMITED;REEL/FRAME:015552/0110 Effective date: 20040730 |
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Owner name: VETCO GRAY CONTROLS LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOUGLA, NEIL;ASSKILDT, KNUT;JOHANNESSEN, SVEIN;REEL/FRAME:017864/0734;SIGNING DATES FROM 20060323 TO 20060420 |
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