US20110083859A1 - Downhole valve - Google Patents
Downhole valve Download PDFInfo
- Publication number
- US20110083859A1 US20110083859A1 US12/575,999 US57599909A US2011083859A1 US 20110083859 A1 US20110083859 A1 US 20110083859A1 US 57599909 A US57599909 A US 57599909A US 2011083859 A1 US2011083859 A1 US 2011083859A1
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- state
- pressure
- tool
- annulus
- valve element
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- 230000007704 transition Effects 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims description 43
- 239000012530 fluid Substances 0.000 claims description 31
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- 230000001747 exhibiting effect Effects 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
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- 230000002706 hydrostatic effect Effects 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
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- 230000003628 erosive effect Effects 0.000 description 1
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Images
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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- 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
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
Definitions
- the invention generally relates to a downhole valve.
- Hydrocarbon fluid typically is communicated from a subterranean well using a pipe, called a “production string.”
- the production string extends through a wellbore that is drilled through the producing formation and may include various valves for purposes of controlling the production of the hydrocarbon fluid.
- One such valve is a ball valve that may be operated for purposes of controlling the flow of the hydrocarbon fluid through the central passageway of the production string.
- Another valve that is typically part of a production string is a circulating valve, a valve that is operated to control the flow of the hydrocarbon fluid between the central passageway and the region outside of the string, called the “annulus.”
- a well may be in an underbalanced state, a state in which the pressure that is exerted by the formation is greater than the hydrostatic pressure that is exerted by the fluid in the annulus.
- One type of circulating valve that is used in an underbalanced well has a series of check valve elements through which well fluid is circulated for purposes of opening and closing the valve.
- a potential challenge in using such a circulating valve is that typically, the central passageway of the production tubing string above the valve must be filled with fluid in order to properly operate the valve.
- Another type of conventional circulating valve is remotely operated by communicating stimuli (pressure pulses, for example) into the fluid in the annulus near the valve.
- a sensor a pressure sensor, for example
- the valve typically decode commands from the stimuli and operate the valve accordingly.
- HPHT high pressure high temperature
- a tool that is usable with a well includes a valve element, a mechanical operator, a pressure chamber and a regulator.
- the valve element has a first state and a second state.
- the mechanical operator responds to a predetermined signature in an annulus pressure relative to a baseline level of the annulus pressure to transition the valve element from the first state to the second state.
- the pressure chamber exerts a chamber pressure to bias the mechanical operator to transition from the second state to the first state.
- the baseline level is capable of varying over time, and the regulator regulates the chamber pressure based on the baseline level.
- a tool that is usable with a well includes a valve element having a first state and a second state.
- the tool includes a spring, a pressure chamber and a mechanical operator.
- the mechanical operator responds to forces exerted in concert by the spring and the pressure chamber to bias transitioning of the valve element from the first state to the second state, and the mechanical operator responds to annulus pressure to transition the valve element from the second state to the first state.
- a tool that is usable with a well includes a valve element, a first mechanical operator, a pilot valve and a second mechanical operator.
- the valve element has a first state and a second state.
- the pilot valve controls communication of an annulus pressure to the first mechanical operator; and the second mechanical operator responds to the annulus pressure to control operation of the pilot valve.
- the second mechanical operator is adapted to cause the pilot valve to communicate the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the first state to the second state in response to the annulus pressure exhibiting a predetermined signature and otherwise block the communication of the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the second state to the first state.
- FIG. 1 is a schematic diagram of a subterranean well according to an example.
- FIG. 2 is a schematic diagram of a circulating valve tool according to an example.
- FIG. 3 is a more detailed cross-sectional view of a mechanical operator section of the tool of FIG. 2 according to an example.
- FIGS. 4 and 5 are schematic diagrams of other examples of circulating valve tools.
- FIG. 6 is a schematic diagram of a hydraulic circuit of the circulating valve tool of FIG. 5 when the tool is in a first state.
- FIG. 7 is a schematic diagram of a hydraulic circuit of the valve of FIG. 5 when the tool is in a second state.
- a well 10 includes a wellbore 20 , which may be lined with a casing string 22 that supports the wellbore 20 .
- the wellbore 20 may be only partially cased by a wellbore or may be entirely uncased.
- a tubular string 30 extends downhole into the wellbore 20 through one or more production or injection zones of the well 10 for purposes of facilitating the production of fluids from the well 10 and/or the injection of fluids into the well 10 .
- FIG. 1 depicts the string 30 as being disposed in a main vertical wellbore, the wellbore 20 may be a lateral wellbore, in accordance with other examples.
- FIG. 1 depicts a subterranean terrestrial well, the systems, techniques, tools and systems that are described herein may likewise be applied to subsea wells.
- the string 30 includes at least one valve assembly, such as a circulating valve tool 50 that is depicted in FIG. 1 .
- the tool 50 may be a multiple cycle tool, which means that the tool 50 is constructed to be opened and closed numerous times.
- the string 30 may includes other types of valve assemblies (a ball valve assembly, for example), which may employ the control systems and techniques that are disclosed herein, in accordance with other examples.
- the well 10 is an underbalanced state, although this condition is not a prerequisite for the use of the tool 50 .
- the pressure that is exerted by the formation is greater than the hydrostatic pressure that is exerted by the fluid in an annulus 54 , which is the annular region of the well 10 between the borehole wall or well casing string 22 (depending on whether the well 10 is cased or uncased) and the exterior of the tool 50 .
- the tool 50 is operated by manipulating a pressure in the annulus 54 .
- the annulus pressure may be manipulated using a surface-disposed pump 12 , although other systems and techniques may be used to induce pressure fluctuations in the annulus 54 for purposes of controlling the tool 50 , as can be appreciated by one of skill in the art.
- pressure stimuli may be communicated from the surface of the well 10 downhole into the annulus 54 for purposes of delivering a command to the tool 50 , such as a command to open fluid communication through radial ports 100 of the tool 50 or a command to close the fluid communication through the radial ports 100 to isolate the annulus 54 from the central passageway of the string 30 , as non-limiting examples.
- a command to open fluid communication through radial ports 100 of the tool 50 or a command to close the fluid communication through the radial ports 100 to isolate the annulus 54 from the central passageway of the string 30 , as non-limiting examples.
- the communication of the pressure stimuli may involve momentarily increasing the pressure in the annulus 54 above a baseline annulus pressure level; momentarily decreasing the annulus pressure below the annulus baseline pressure level; a series of annulus pressure increases or decreases; etc.
- a sequence of pressurization cycles may be applied to the annulus 54 to operate the tool 50 .
- the pressurization cycles may include cycles (called “up cycles”) in which the annulus pressure is increased and cycles (called “down cycles”) in which the annulus pressure is relaxed or decreased back to the annulus baseline level.
- up cycles cycles in which the annulus pressure is increased
- down cycles cycles in which the annulus pressure is relaxed or decreased back to the annulus baseline level.
- the tool 50 includes a mechanical operator 130 , which responds to the fluid pressure in the annulus 54 .
- the actuation of the mechanical operator 130 does not depend on whether a full column of fluid exists in the central passageway of the string 30 , and the operation of the mechanical operator does not involve circulating well fluid through the tool 50 .
- the tool 50 communicates the annulus pressure to the mechanical operator 130 for purposes of transitioning the tool 50 from a first state (an open or closed state, as non-limiting examples) to a different, second state (an open or closed state, as non-limiting examples).
- a gas chamber 134 of the tool 50 exerts a force to counter the force that is produced by the annulus pressure (e.g., to bias the tool 50 to remain in the first state or return to the first state from the second state).
- the tool 50 has features to compensate the force that is exerted by the gas chamber 134 for purposes of causing this force to track the baseline pressure level of the annulus. In this way, the gas chamber accommodates downhole pressure and temperature fluctuations, which may otherwise adversely affect the operation of the tool 50 .
- FIG. 2 depicts a partial cross-sectional view of the tool 50 , in accordance with a non-limiting example.
- FIG. 2 depicts a simplified, right-hand cross-sectional view of the tool 50 (on the right hand side of a longitudinal axis 51 of the tool 50 ), as can be appreciated by one of skill in the art, the tool 50 is generally symmetrical about the longitudinal axis 51 , with the corresponding mirroring left-hand cross-section generally not being depicted in FIG. 2 .
- the tool 50 includes a generally tubular outer housing 99 , which is generally coaxial with the longitudinal axis 51 and is designed to connect in line with the string 30 .
- the outer housing 99 includes a central passageway 90 that is in fluid communication with the corresponding central passageways of the string sections above and below the valve assembly 50 .
- the tool 50 includes a circulating valve element 107 , which includes the radially-disposed flow ports 100 , which are formed in the housing 99 .
- the sleeve 104 is near or at the uppermost point of travel such that the flow ports 100 are disposed between the o-rings 106 to therefore block fluid communication between the central passageway 90 and the annulus 54 .
- the up and down travel of the sleeve 104 is controlled by the mechanical operator 130 of the tool 50 .
- the operator 130 includes a piston head 140 , which is connected through a mandrel 105 to the sleeve 106 .
- the piston head 140 is concentric with the sleeve 104 and has a central passageway to form part of the central passageway 90 of the tool 50 .
- the piston head 140 moves up and down in response to a pressure differential between upper and lower gas chambers: the gas chamber 134 (called the “upper chamber 134 ” below), which exerts a downward force on an upper surface of the piston head 140 and a gas chamber 135 (called the “lower chamber 135 ” below), which exerts an upward force on a lower surface of the piston head 140 .
- the upper 134 and lower 135 chambers reside inside a corresponding annular recess of the housing 99 .
- the volumes of the upper 134 and lower 135 gas chambers are variable in that the volume of the upper chamber 134 is maximized and the volume of the lower chamber 135 is minimized (as depicted in FIG. 2 ) in the open state of the tool 50 ; and the volume of the upper chamber 134 is minimized, and the volume of the lower chamber 135 is maximized in the closed state of the valve 50 .
- the upper 134 and lower 135 chambers contain an inert gas (Nitrogen, for example); and the differential pressure between the upper 134 and lower 135 chambers control the upward and downward movement of the piston head 140 , and thus, control the upper and downward movement of the sleeve 104 .
- the lower chamber 135 is in fluid communication with another gas chamber 146 via a gas passageway 147 .
- the gas chamber 146 is part of a compensator 150 , which transfers the annulus pressure to the gas chamber 146 while isolating the gas chamber 146 from the well fluid in the annulus 54 .
- the compensator 150 includes a floating compensating piston 148 , which resides in an annular recess of the housing 99 to form the gas chamber 146 above the piston 148 and a chamber 149 below the piston 148 , which receives annulus fluid communicated from one or more radially-disposed ports 160 (one port being shown in FIG. 2 ) that are formed in the outer housing 99 .
- the compensating piston 148 pressurizes the gas in the gas chamber 146 , which in turn, produces an upward force on the piston head 140 .
- a valve control network is built into the piston head 140 to allow equalization of pressures between the upper 134 and lower 135 gas chambers.
- the equalization occurs at a controlled rate for purposes of permitting pressure differentials to develop to act on the piston head 140 .
- the flow rate between the gas chambers 134 and 135 is initially limited when the annulus pressure first changes with respect to its steady state baseline pressure level. This limited flow rate, in turn, produces a set upward or downward force on the piston head 140 .
- the pressure in the chamber 135 exceeds the pressure in the chamber 134 to cause an upward force on the piston head 140 .
- the pressures between the chambers 134 and 135 equalize to create a balanced condition after the piston head 140 is shifted to an upper position.
- the tool 50 includes an indexer 110 to control the sequence of annulus pressurization cycles for purposes of causing the tool 50 to change states.
- the indexer 110 may a J-slot mechanism, in which a pin on the operator mandrel 105 traverses a J-slot that has a predetermined pattern that restricts the travel of the operator mandrel 105 until the end of the pattern is reached.
- the J-slot establishes a predetermined number up/down pressurization cycles that must occur before the tool 50 transitions from a closed state to an open state.
- the indexer 110 may be reset by releasing pressure on the annulus to move the operator mandrel 105 back to its lowermost point of travel to close the tool 50 .
- the tool 50 may include a mechanism 120 to restrict all motion of the operator mandrel 105 until a predetermined force on the piston head 140 (and operator mandrel 105 ) builds up. This allows the pressure differential across the piston head 140 to increase to a predetermined threshold before the operator mandrel 105 shifts for purposes of increasing the tool shifting speed to avoid leaving the tool 50 in an undesirable mid state (never fully opened or fully closed, for example).
- the mechanism 120 may be a collet, which includes a plurality of fingers that engage corresponding features on the operator mandrel 105 to secure the operator mandrel 105 in place until the predetermined force threshold is reached. The fingers on the collet hold the operator mandrel 105 in its original position until the pressure differential across the piston head 140 is sufficiently high to overcome the grasp of the collet fingers and quickly shift the operator mandrel 105 all the way to the end position.
- the piston head 140 may include an embedded valve system, which includes a first flow path 190 for purposes of communicating gas pressure from the lower chamber 135 to the upper chamber 134 .
- This flow path includes a flow restrictor 210 and a check valve 200 .
- the check valve 200 opens to permit a bleed flow between the chambers 134 and 135 .
- the flow restrictor 210 ensures that the flow rate is relatively small to create a pressure differential to produce an upward force on the piston head 140 .
- a radial crosshole 204 which is in communication with the above-described communication path bypasses a seal that is created by an upper o-ring 212 to bypass the flow restrictor 210 and allow relatively fast equalization of the pressure between the upper 134 and lower 135 chambers.
- a metered flow path 191 is disposed in the piston head 140 for purposes of equalizing pressures in the chambers 134 and 135 for the scenario in which the lower chamber 135 is de-pressurized due to a decrease in the annulus pressure.
- This flow path 191 includes a flow restrictor 208 and a check valve 206 , which is constructed to open to allow communication through the flow restrictor 208 between the chambers 134 and 135 when the pressure in the upper chamber 134 is greater than the pressure in the lower chamber 135 . Due to the metering by the flow restrictor 208 , a downward force is created while the pressures in the chambers 134 and 135 are being equalized.
- a cross hole 207 which is in communication with the passageway travels past the seal created by a lower o-ring 214 to therefore bypass the flow restrictor 208 to allow relatively rapid equalization of the chamber pressures.
- the pressure in the upper chamber 134 tracks the baseline pressure level in the annulus 54 to compensate its gas pressure for shrinkage or expansion due to thermal changes and changes in the annulus pressure.
- FIG. 4 depicts a circulating valve tool 250 in accordance with other another example.
- the tool 250 includes a mechanical operator that responds to pressure changes in the annulus 54 , without requiring a full column of fluid in the tubing string and without requiring circulation of well fluid through the tool 250 .
- the tool 250 does not use a gas chamber that equalizes its pressure with the baseline annulus pressure.
- the tool 250 includes a gas chamber 264 that has a fill port to store a predetermined charge of inert gas (Nitrogen gas, for example), which is used for purposes of operating a circulating valve element 252 of the tool 250 .
- inert gas Nirogen gas
- the combination of pressure from the gas chamber 264 and a spring 260 produces an upward force on a power piston head 258 .
- the power piston head 258 is connected by way of an operator mandrel 254 to the circulating valve element 252 .
- the tool 250 may include an indexer 270 to establish a predefined up and down transition cycle in order to change the state of the circulating valve 252 .
- the upper surface of the piston 258 is exposed through radial ports 256 to the annulus pressure.
- the piston 258 moves downwardly in response to increasing pressure in the pressure stimuli, and when the pressure relaxes, the upward force provided by the compressed spring 260 and the gas pressure exerted by the gas chamber 264 produce a force in concert to move the piston 258 in an upward direction.
- valve assembly 250 may include a retention mechanism, such as the above-described collet, for purposes of storing energy and ensuring a fast valve opening, which avoids half states and overcomes the effects of erosion.
- FIG. 5 depicts a circulating valve tool 300 in accordance with another example.
- the tool 300 has a similar design, in some aspects, relative to the tool 50 , in that the tool 300 has upper 320 and lower 326 gas chambers, an operator piston 324 and indexer 314 , similar in design to the upper 134 and lower 135 gas chambers, piston 130 and indexer 110 , respectively, of the tool 50 .
- the lower gas chamber 326 has pressure that is derived by a compensator from the annulus pressure (not depicted in FIG. 5 ).
- the valve assembly 300 does not use the gas pressure to drive an operator mandrel for purposes of opening and closing a circulating valve element 302 of the tool 300 . Instead, the tool 300 uses the annulus pressure for purposes of operating the circulating valve element 302 .
- the piston 324 may be connected to operator a pilot valve 312 , which controls the application of annulus pressure to a power piston 304 , which, in turn, operates the circulating valve 302 .
- the system to control the power piston 304 includes a pilot valve 312 (connected to the piston 320 ), a hydrostatic chamber 308 and a dump chamber 306 .
- FIGS. 6 depictting the power piston 304 at its uppermost position of travel
- 7 depictting the power piston 304 at its lowermost position of travel
- annulus pressure is always applied to an upper chamber that is communication with an upper face of the power piston 304 .
- the lower face of the piston 304 is connected either to the dump chamber 306 or to the hydrostatic chamber 308 , as depicted in FIG. 6 .
- an operator section 322 that contains the piston 320
- the power piston 304 moves upwardly, as depicted in FIG. 6 .
- FIG. 6 depicted in FIG.
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Abstract
A tool that is usable with a well includes a valve element, a mechanical operator, a pressure chamber and a regulator. The valve element has a first state and a second state. The mechanical operator responds to a predetermined signature in an annulus pressure relative to a baseline level of the annulus pressure to transition the valve element from the first state to the second state. The pressure chamber exerts a chamber pressure to bias the mechanical operator to transition from the second state to the first state. The baseline level is capable of varying over time, and the regulator regulates the chamber pressure based on the baseline level.
Description
- The invention generally relates to a downhole valve.
- Hydrocarbon fluid (oil or gas) typically is communicated from a subterranean well using a pipe, called a “production string.” The production string extends through a wellbore that is drilled through the producing formation and may include various valves for purposes of controlling the production of the hydrocarbon fluid. One such valve is a ball valve that may be operated for purposes of controlling the flow of the hydrocarbon fluid through the central passageway of the production string. Another valve that is typically part of a production string is a circulating valve, a valve that is operated to control the flow of the hydrocarbon fluid between the central passageway and the region outside of the string, called the “annulus.”
- A well may be in an underbalanced state, a state in which the pressure that is exerted by the formation is greater than the hydrostatic pressure that is exerted by the fluid in the annulus. One type of circulating valve that is used in an underbalanced well has a series of check valve elements through which well fluid is circulated for purposes of opening and closing the valve. A potential challenge in using such a circulating valve is that typically, the central passageway of the production tubing string above the valve must be filled with fluid in order to properly operate the valve.
- Another type of conventional circulating valve is remotely operated by communicating stimuli (pressure pulses, for example) into the fluid in the annulus near the valve. A sensor (a pressure sensor, for example) of the circulating valve detects the stimuli, and electromechanics of the valve typically decode commands from the stimuli and operate the valve accordingly. Although there is no requirement that the central passageway be filled with fluid for purposes of operating this type of circulating valve, the valve typically is not suitable for use in a high pressure high temperature (HPHT) environment due to temperature limitations of the valve.
- In an embodiment of the invention, a tool that is usable with a well includes a valve element, a mechanical operator, a pressure chamber and a regulator. The valve element has a first state and a second state. The mechanical operator responds to a predetermined signature in an annulus pressure relative to a baseline level of the annulus pressure to transition the valve element from the first state to the second state. The pressure chamber exerts a chamber pressure to bias the mechanical operator to transition from the second state to the first state. The baseline level is capable of varying over time, and the regulator regulates the chamber pressure based on the baseline level.
- In another embodiment of the invention, a tool that is usable with a well includes a valve element having a first state and a second state. The tool includes a spring, a pressure chamber and a mechanical operator. The mechanical operator responds to forces exerted in concert by the spring and the pressure chamber to bias transitioning of the valve element from the first state to the second state, and the mechanical operator responds to annulus pressure to transition the valve element from the second state to the first state.
- In yet another embodiment of the invention, a tool that is usable with a well includes a valve element, a first mechanical operator, a pilot valve and a second mechanical operator. The valve element has a first state and a second state. The pilot valve controls communication of an annulus pressure to the first mechanical operator; and the second mechanical operator responds to the annulus pressure to control operation of the pilot valve. The second mechanical operator is adapted to cause the pilot valve to communicate the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the first state to the second state in response to the annulus pressure exhibiting a predetermined signature and otherwise block the communication of the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the second state to the first state.
- Advantages and other features of the invention will become apparent from the following drawing, description and claims.
-
FIG. 1 is a schematic diagram of a subterranean well according to an example. -
FIG. 2 is a schematic diagram of a circulating valve tool according to an example. -
FIG. 3 is a more detailed cross-sectional view of a mechanical operator section of the tool ofFIG. 2 according to an example. -
FIGS. 4 and 5 are schematic diagrams of other examples of circulating valve tools. -
FIG. 6 is a schematic diagram of a hydraulic circuit of the circulating valve tool ofFIG. 5 when the tool is in a first state. -
FIG. 7 is a schematic diagram of a hydraulic circuit of the valve ofFIG. 5 when the tool is in a second state. - In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments are possible.
- As used here, the terms “above” and “below”; “up” and “down”; “upper” and “lower”; “upwardly” and “downwardly”; and other like terms indicating relative positions above or below a given point or element are used in this description to more clearly describe some embodiments of the invention. However, when applied to equipment and methods for use in wells that are deviated or horizontal, such terms may refer to a left to right, right to left, or diagonal relationship as appropriate.
- Referring to
FIG. 1 , in accordance with an example, a well 10 includes awellbore 20, which may be lined with acasing string 22 that supports thewellbore 20. As other examples, thewellbore 20 may be only partially cased by a wellbore or may be entirely uncased. Atubular string 30 extends downhole into thewellbore 20 through one or more production or injection zones of thewell 10 for purposes of facilitating the production of fluids from thewell 10 and/or the injection of fluids into thewell 10. It is noted that althoughFIG. 1 depicts thestring 30 as being disposed in a main vertical wellbore, thewellbore 20 may be a lateral wellbore, in accordance with other examples. Furthermore, althoughFIG. 1 depicts a subterranean terrestrial well, the systems, techniques, tools and systems that are described herein may likewise be applied to subsea wells. - In general, the
string 30 includes at least one valve assembly, such as a circulatingvalve tool 50 that is depicted inFIG. 1 . For purposes of example, thetool 50 may be a multiple cycle tool, which means that thetool 50 is constructed to be opened and closed numerous times. It is noted that thestring 30 may includes other types of valve assemblies (a ball valve assembly, for example), which may employ the control systems and techniques that are disclosed herein, in accordance with other examples. - For the following example, it is assumed that the
well 10 is an underbalanced state, although this condition is not a prerequisite for the use of thetool 50. In the underbalanced state, the pressure that is exerted by the formation is greater than the hydrostatic pressure that is exerted by the fluid in anannulus 54, which is the annular region of thewell 10 between the borehole wall or well casing string 22 (depending on whether thewell 10 is cased or uncased) and the exterior of thetool 50. In general, thetool 50 is operated by manipulating a pressure in theannulus 54. As examples, the annulus pressure may be manipulated using a surface-disposedpump 12, although other systems and techniques may be used to induce pressure fluctuations in theannulus 54 for purposes of controlling thetool 50, as can be appreciated by one of skill in the art. - To operate the
tool 50, pressure stimuli may be communicated from the surface of the well 10 downhole into theannulus 54 for purposes of delivering a command to thetool 50, such as a command to open fluid communication throughradial ports 100 of thetool 50 or a command to close the fluid communication through theradial ports 100 to isolate theannulus 54 from the central passageway of thestring 30, as non-limiting examples. As more specific examples, the communication of the pressure stimuli may involve momentarily increasing the pressure in theannulus 54 above a baseline annulus pressure level; momentarily decreasing the annulus pressure below the annulus baseline pressure level; a series of annulus pressure increases or decreases; etc. - In one control scheme, a sequence of pressurization cycles may be applied to the
annulus 54 to operate thetool 50. The pressurization cycles may include cycles (called “up cycles”) in which the annulus pressure is increased and cycles (called “down cycles”) in which the annulus pressure is relaxed or decreased back to the annulus baseline level. In this manner, a particular number of up and down pressurization cycles may be used for purposes of transitioning thetool 50 from its closed state to its open state, and vice versa. - As described herein, the
tool 50 includes amechanical operator 130, which responds to the fluid pressure in theannulus 54. Unlike conventional arrangements, the actuation of themechanical operator 130 does not depend on whether a full column of fluid exists in the central passageway of thestring 30, and the operation of the mechanical operator does not involve circulating well fluid through thetool 50. Instead, as described herein, thetool 50 communicates the annulus pressure to themechanical operator 130 for purposes of transitioning thetool 50 from a first state (an open or closed state, as non-limiting examples) to a different, second state (an open or closed state, as non-limiting examples). - As further described herein, a
gas chamber 134 of thetool 50 exerts a force to counter the force that is produced by the annulus pressure (e.g., to bias thetool 50 to remain in the first state or return to the first state from the second state). Thetool 50 has features to compensate the force that is exerted by thegas chamber 134 for purposes of causing this force to track the baseline pressure level of the annulus. In this way, the gas chamber accommodates downhole pressure and temperature fluctuations, which may otherwise adversely affect the operation of thetool 50. -
FIG. 2 depicts a partial cross-sectional view of thetool 50, in accordance with a non-limiting example. AlthoughFIG. 2 depicts a simplified, right-hand cross-sectional view of the tool 50 (on the right hand side of alongitudinal axis 51 of the tool 50), as can be appreciated by one of skill in the art, thetool 50 is generally symmetrical about thelongitudinal axis 51, with the corresponding mirroring left-hand cross-section generally not being depicted inFIG. 2 . - Referring to
FIG. 2 in conjunction withFIG. 1 , thetool 50 includes a generally tubularouter housing 99, which is generally coaxial with thelongitudinal axis 51 and is designed to connect in line with thestring 30. Theouter housing 99 includes acentral passageway 90 that is in fluid communication with the corresponding central passageways of the string sections above and below thevalve assembly 50. Thetool 50 includes a circulatingvalve element 107, which includes the radially-disposedflow ports 100, which are formed in thehousing 99. - In the open state of the circulating valve element 107 (and tool 50), fluid communication is established between the annulus 54 (see
FIG. 1 ) and thecentral passageway 90 through theflow ports 100. In this open state, aninternal sleeve 104 of the circulatingvalve element 107 is in its downward position of travel (as depicted inFIG. 2 ), which means that theflow ports 100 are above the highest o-ring 106 on the sleeve 104 (i.e., thesleeve 104 and its associated o-rings do not block the radial flow). - For the closed state (not depicted in
FIG. 2 ) of the valve element 107 (and tool 50), thesleeve 104 is near or at the uppermost point of travel such that theflow ports 100 are disposed between the o-rings 106 to therefore block fluid communication between thecentral passageway 90 and theannulus 54. - The up and down travel of the
sleeve 104 is controlled by themechanical operator 130 of thetool 50. In general, theoperator 130 includes apiston head 140, which is connected through amandrel 105 to thesleeve 106. In general, thepiston head 140 is concentric with thesleeve 104 and has a central passageway to form part of thecentral passageway 90 of thetool 50. Thepiston head 140 moves up and down in response to a pressure differential between upper and lower gas chambers: the gas chamber 134 (called the “upper chamber 134” below), which exerts a downward force on an upper surface of thepiston head 140 and a gas chamber 135 (called the “lower chamber 135” below), which exerts an upward force on a lower surface of thepiston head 140. The upper 134 and lower 135 chambers reside inside a corresponding annular recess of thehousing 99. - The volumes of the upper 134 and lower 135 gas chambers are variable in that the volume of the
upper chamber 134 is maximized and the volume of thelower chamber 135 is minimized (as depicted inFIG. 2 ) in the open state of thetool 50; and the volume of theupper chamber 134 is minimized, and the volume of thelower chamber 135 is maximized in the closed state of thevalve 50. The upper 134 and lower 135 chambers contain an inert gas (Nitrogen, for example); and the differential pressure between the upper 134 and lower 135 chambers control the upward and downward movement of thepiston head 140, and thus, control the upper and downward movement of thesleeve 104. Thelower chamber 135 is in fluid communication with anothergas chamber 146 via agas passageway 147. - The
gas chamber 146 is part of acompensator 150, which transfers the annulus pressure to thegas chamber 146 while isolating thegas chamber 146 from the well fluid in theannulus 54. More specifically, thecompensator 150 includes a floating compensatingpiston 148, which resides in an annular recess of thehousing 99 to form thegas chamber 146 above thepiston 148 and achamber 149 below thepiston 148, which receives annulus fluid communicated from one or more radially-disposed ports 160 (one port being shown inFIG. 2 ) that are formed in theouter housing 99. Thus, in general, via theports 160, well fluid enters thechamber 149 and exerts upward pressure on the compensatingpiston 148. In response to this pressure, the compensatingpiston 148 pressurizes the gas in thegas chamber 146, which in turn, produces an upward force on thepiston head 140. - As described in more detail below, a valve control network is built into the
piston head 140 to allow equalization of pressures between the upper 134 and lower 135 gas chambers. However, the equalization occurs at a controlled rate for purposes of permitting pressure differentials to develop to act on thepiston head 140. More specifically, the flow rate between thegas chambers piston head 140. - For example, in response to an increase in annulus pressure, the pressure in the
chamber 135 exceeds the pressure in thechamber 134 to cause an upward force on thepiston head 140. As thepiston head 140 moves upwardly, the pressures between thechambers piston head 140 is shifted to an upper position. - When the annulus pressure subsequently decreases, a downward force is initially produced on the
piston head 140 due to the momentary differential pressure. Due to the valve system in thepiston head 140, the pressures generally equalize so that when thepiston head 140 reaches a point near its lowermost position of travel (as depicted inFIG. 2 ), a balanced condition once again rises. Due to the above-described pressure balancing, the gas pressure in thetool 50 adjusts to the baseline annulus pressure level; and as such, the gas charge is compensated for shrinkage or expansion due to thermal changes and changes in the annulus pressure. - Among the other features of the
tool 50, in accordance with some examples, thetool 50 includes anindexer 110 to control the sequence of annulus pressurization cycles for purposes of causing thetool 50 to change states. As a non-limiting example, theindexer 110 may a J-slot mechanism, in which a pin on theoperator mandrel 105 traverses a J-slot that has a predetermined pattern that restricts the travel of theoperator mandrel 105 until the end of the pattern is reached. In other words, the J-slot establishes a predetermined number up/down pressurization cycles that must occur before thetool 50 transitions from a closed state to an open state. Once at the end of the pattern, theindexer 110 may be reset by releasing pressure on the annulus to move theoperator mandrel 105 back to its lowermost point of travel to close thetool 50. - The
tool 50 may include amechanism 120 to restrict all motion of theoperator mandrel 105 until a predetermined force on the piston head 140 (and operator mandrel 105) builds up. This allows the pressure differential across thepiston head 140 to increase to a predetermined threshold before theoperator mandrel 105 shifts for purposes of increasing the tool shifting speed to avoid leaving thetool 50 in an undesirable mid state (never fully opened or fully closed, for example). In accordance with some examples, themechanism 120 may be a collet, which includes a plurality of fingers that engage corresponding features on theoperator mandrel 105 to secure theoperator mandrel 105 in place until the predetermined force threshold is reached. The fingers on the collet hold theoperator mandrel 105 in its original position until the pressure differential across thepiston head 140 is sufficiently high to overcome the grasp of the collet fingers and quickly shift theoperator mandrel 105 all the way to the end position. - Referring to
FIG. 3 , thepiston head 140 may include an embedded valve system, which includes afirst flow path 190 for purposes of communicating gas pressure from thelower chamber 135 to theupper chamber 134. This flow path includes aflow restrictor 210 and acheck valve 200. In this arrangement, when the pressure in thelower chamber 135 exceeds the pressure in theupper chamber 134, thecheck valve 200 opens to permit a bleed flow between thechambers piston head 140. After thepiston head 140 has traveled upwardly by a sufficient distance, aradial crosshole 204, which is in communication with the above-described communication path bypasses a seal that is created by an upper o-ring 212 to bypass theflow restrictor 210 and allow relatively fast equalization of the pressure between the upper 134 and lower 135 chambers. - In a similar arrangement, a
metered flow path 191 is disposed in thepiston head 140 for purposes of equalizing pressures in thechambers lower chamber 135 is de-pressurized due to a decrease in the annulus pressure. Thisflow path 191 includes aflow restrictor 208 and acheck valve 206, which is constructed to open to allow communication through theflow restrictor 208 between thechambers upper chamber 134 is greater than the pressure in thelower chamber 135. Due to the metering by theflow restrictor 208, a downward force is created while the pressures in thechambers piston head 130 has traveled downwardly by a sufficient distance, a cross hole 207, which is in communication with the passageway travels past the seal created by a lower o-ring 214 to therefore bypass theflow restrictor 208 to allow relatively rapid equalization of the chamber pressures. - Thus, due to the above-described valve system in the
piston head 140, the pressure in theupper chamber 134 tracks the baseline pressure level in theannulus 54 to compensate its gas pressure for shrinkage or expansion due to thermal changes and changes in the annulus pressure. -
FIG. 4 depicts a circulatingvalve tool 250 in accordance with other another example. Similar to thetool 50, thetool 250 includes a mechanical operator that responds to pressure changes in theannulus 54, without requiring a full column of fluid in the tubing string and without requiring circulation of well fluid through thetool 250. However, unlike thetool 50, thetool 250 does not use a gas chamber that equalizes its pressure with the baseline annulus pressure. Instead, thetool 250 includes agas chamber 264 that has a fill port to store a predetermined charge of inert gas (Nitrogen gas, for example), which is used for purposes of operating a circulatingvalve element 252 of thetool 250. - More specifically, the combination of pressure from the
gas chamber 264 and a spring 260 (a Belleville spring or bellows spring, as non-limiting examples) produces an upward force on apower piston head 258. Thepower piston head 258, in turn, is connected by way of anoperator mandrel 254 to the circulatingvalve element 252. As also shown inFIG. 4 , thetool 250 may include anindexer 270 to establish a predefined up and down transition cycle in order to change the state of the circulatingvalve 252. The upper surface of thepiston 258 is exposed throughradial ports 256 to the annulus pressure. Therefore, thepiston 258 moves downwardly in response to increasing pressure in the pressure stimuli, and when the pressure relaxes, the upward force provided by thecompressed spring 260 and the gas pressure exerted by thegas chamber 264 produce a force in concert to move thepiston 258 in an upward direction. - Other variations are contemplated and are within the scope of the appended claims. For example, the
valve assembly 250 may include a retention mechanism, such as the above-described collet, for purposes of storing energy and ensuring a fast valve opening, which avoids half states and overcomes the effects of erosion. -
FIG. 5 depicts a circulatingvalve tool 300 in accordance with another example. Thetool 300 has a similar design, in some aspects, relative to thetool 50, in that thetool 300 has upper 320 and lower 326 gas chambers, anoperator piston 324 andindexer 314, similar in design to the upper 134 and lower 135 gas chambers,piston 130 andindexer 110, respectively, of thetool 50. In this regard, thelower gas chamber 326 has pressure that is derived by a compensator from the annulus pressure (not depicted inFIG. 5 ). However, unlike thetool 50, thevalve assembly 300 does not use the gas pressure to drive an operator mandrel for purposes of opening and closing a circulatingvalve element 302 of thetool 300. Instead, thetool 300 uses the annulus pressure for purposes of operating the circulatingvalve element 302. - More specifically, the
piston 324 may be connected to operator apilot valve 312, which controls the application of annulus pressure to apower piston 304, which, in turn, operates the circulatingvalve 302. As shown inFIG. 5 , the system to control thepower piston 304 includes a pilot valve 312 (connected to the piston 320), ahydrostatic chamber 308 and adump chamber 306. - Operation of the
tool 300 may be better understood with reference toFIGS. 6 (depicting thepower piston 304 at its uppermost position of travel) and 7 (depicting thepower piston 304 at its lowermost position of travel). Referring toFIG. 6 , annulus pressure is always applied to an upper chamber that is communication with an upper face of thepower piston 304. The lower face of thepiston 304, in turn, is connected either to thedump chamber 306 or to thehydrostatic chamber 308, as depicted inFIG. 6 . When an operator section 322 (that contains the piston 320) configures thepilot valve 312 to connect the lower chamber to thehydrostatic chamber 308, thepower piston 304 moves upwardly, as depicted inFIG. 6 . As depicted inFIG. 7 , when theoperator section 322 configures thepilot valve 312 to connect the lower chamber to thedump chamber 306, then thepower piston 304 moves to the lower position as depicted inFIG. 7 . It is noted that the number of up and down cycles to effect a transition of thepower piston 304 is controlled by the capacity of thedump chamber 306. - While the present invention has been described with respect to a limited number of embodiments, those skilled in the art, having the benefit of this disclosure, will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover all such modifications and variations as fall within the true spirit and scope of this present invention.
Claims (29)
1. A tool usable with a well, comprising:
a valve element having a first state and a second state;
a mechanical operator to respond to a predetermined signature in an annulus pressure relative to a baseline level of the annulus pressure to transition the valve element from the first state to the second state, the baseline level capable of varying over time;
a pressure chamber to exert a chamber pressure to bias the mechanical operator to transition from the second state to the first state; and
a regulator to regulate the second pressure based on the baseline level.
2. The tool of claim 1 , wherein the predetermined signature comprises a momentary increase in the annulus pressure above the baseline level.
3. The tool of claim 1 , wherein the tool comprises:
a first gas chamber to store a gas; and
a compensator to isolate the gas from fluid in the annulus and communicate the predetermined signature to the first gas chamber.
4. The tool of claim 3 , further comprising:
a second gas chamber,
wherein the mechanical operator comprises a piston to travel between an upper position and a lower position in response to a differential between a pressure exerted by the gas stored in the first gas chamber and a pressure in the second gas chamber.
5. The tool of claim 4 , wherein the mechanical operator further comprises:
a pressure equalizer to bleed gas between the first and second gas chambers to equalize the pressure in the first and second gas chambers in response to the pressure differential.
6. The tool of claim 5 , wherein the pressure equalizer is adapted to accelerate equalization of the pressures in the first and second chambers in response to the second piston nearing the first position or the second piston nearing the second position.
7. The tool of claim 1 , further comprising:
an indexer to establish a predetermined travel pattern from the mechanical operator before the valve element transitions from the first state to the second state.
8. A method usable with a well, comprising:
responding to a predetermined signature in an annulus pressure relative to a baseline level of the annulus pressure transition a valve element from a first state to a second state, the baseline level capable of varying over time;
exerting a chamber pressure to bias the valve element to transition from the second state to the first; and
regulating the chamber pressure based on the baseline level.
9. The method of claim 8 , wherein the predetermined signature comprises a momentary increase in the annulus pressure above the baseline level.
10. The method of claim 8 , wherein the act of regulating comprises regulating the chamber pressure to track the baseline level.
11. The method of claim 8 , further comprising:
bleeding gas between the first and second chambers to equalize the pressure in the first and second chambers in response to a pressure differential between the first and second chambers.
12. The method of claim 8 , further comprising:
using an indexer to establish a predetermined pressurization schedule for the annulus for the valve element to transition from the first state to the second state.
13. A tool usable with a well, comprising:
a valve element having a first state and a second state;
a spring;
a pressure chamber;
a mechanical operator to:
respond to forces exerted in concert by the spring and the pressure chamber to bias transitioning of the valve element from the first state to the second state; and
respond to annulus pressure to transition the valve element from the second state to the first state.
14. The tool of claim 13 , wherein the spring comprises a Belleville spring.
15. The tool of claim 13 , further comprising:
a collet to selectively restrict operation of the mechanical operator to establish a predetermined force for transitioning the mechanical operator.
16. The tool of claim 13 , wherein the pressure chamber is filled with an inert gas.
17. The tool of claim 13 , further comprising:
an indexer to selectively restrict travel of the mechanical operator until a predetermined number of pressurization cycles occur in the well.
18. A method comprising:
biasing a valve element to transition from a first state to a second state, comprising responding to forces exerted in concert by a spring and a pressure chamber; and
responding to annulus pressure to transition the valve element from the second state to the first state.
19. The method of claim 18 , wherein the act of responding to the annulus pressure comprises transitioning a circulating valve from the second state to the first state.
20. The method of claim 18 , further comprising:
restricting transitioning of the valve element with a collet until the forces exerted in concert by the spring and the pressure chamber exceed a predetermined threshold.
21. The method of claim 18 , further comprising:
regulating the transition of the valve element using an indexer.
22. A tool usable with a well, comprising:
a valve element having a first state and a second state;
a first mechanical operator;
a pilot valve to control communication of an annulus pressure to the first mechanical operator; and
a second mechanical operator to respond to annulus pressure to control operation of the pilot valve,
wherein the second mechanical operator is adapted to cause pilot valve to communicate the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the first state to the second state in response to the annulus pressure exhibiting a predetermined signature and otherwise block the communication of the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the second state to the first state.
23. The tool of claim 22 , further comprising:
a dump chamber to receive fluid from the first mechanical operator in response to the transition of the second mechanical operator from the second state to the first state.
24. The tool of claim 22 , further comprising:
a compensator to transfer pressure from the annulus and isolate the annulus fluid from the second mechanical operator.
25. The tool of claim 22 , wherein the valve element comprises a circulation valve element.
26. A method comprising:
operating a pilot valve to communicate annulus pressure to a first mechanical operator to cause the first mechanical operator to transition a valve element from a first state to a second state in response to the annulus pressure exhibiting a first predetermined signature; and
using the pilot valve to block the communication of the annulus pressure to the first mechanical operator to cause the first mechanical operator to transition the valve element from the second state to the first state in response to the annulus pressure exhibiting a second predetermined signature.
27. The method of claim 26 , further comprising:
receiving fluid from the first mechanical operator in a dump chamber in response to the transition of the second mechanical operator from the second state to the first state.
28. The method of claim 26 , further comprising:
transferring pressure from the annulus and isolating the annulus fluid from the second mechanical operator.
29. The method of claim 26 , wherein the valve element comprises a circulation valve element.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/575,999 US20110083859A1 (en) | 2009-10-08 | 2009-10-08 | Downhole valve |
GB1205983.8A GB2486383B (en) | 2009-10-08 | 2010-09-23 | Downhole valve |
BR112012007724A BR112012007724A2 (en) | 2009-10-08 | 2010-09-23 | tool usable in a well, method usable in a well, and method |
PCT/US2010/049903 WO2011043931A2 (en) | 2009-10-08 | 2010-09-23 | Downhole valve |
NO20120432A NO20120432A1 (en) | 2009-10-08 | 2012-04-12 | Downhole Valve |
US13/969,100 US9062514B2 (en) | 2009-10-08 | 2013-08-16 | Downhole valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/575,999 US20110083859A1 (en) | 2009-10-08 | 2009-10-08 | Downhole valve |
Related Child Applications (1)
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US13/969,100 Division US9062514B2 (en) | 2009-10-08 | 2013-08-16 | Downhole valve |
Publications (1)
Publication Number | Publication Date |
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US20110083859A1 true US20110083859A1 (en) | 2011-04-14 |
Family
ID=43853915
Family Applications (2)
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US12/575,999 Abandoned US20110083859A1 (en) | 2009-10-08 | 2009-10-08 | Downhole valve |
US13/969,100 Active US9062514B2 (en) | 2009-10-08 | 2013-08-16 | Downhole valve |
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Application Number | Title | Priority Date | Filing Date |
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US13/969,100 Active US9062514B2 (en) | 2009-10-08 | 2013-08-16 | Downhole valve |
Country Status (5)
Country | Link |
---|---|
US (2) | US20110083859A1 (en) |
BR (1) | BR112012007724A2 (en) |
GB (1) | GB2486383B (en) |
NO (1) | NO20120432A1 (en) |
WO (1) | WO2011043931A2 (en) |
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US20090242199A1 (en) * | 2008-03-26 | 2009-10-01 | Schlumberger Technology Corporation | Systems and techniques to actuate isolation valves |
US20130087326A1 (en) * | 2011-10-06 | 2013-04-11 | Halliburton Energy Services, Inc. | Downhole Tester Valve Having Rapid Charging Capabilities and Method for Use Thereof |
US20130327538A1 (en) * | 2012-06-12 | 2013-12-12 | Schlumberger Technology Corporation | Underbalance actuators and methods |
US20140014352A1 (en) * | 2011-03-30 | 2014-01-16 | Welltec A/S | Downhole pressure compensating device |
US20140069508A1 (en) * | 2012-09-07 | 2014-03-13 | Leo Minervini | Virtual Limit Switch |
WO2015051469A1 (en) * | 2013-10-11 | 2015-04-16 | Raise Production Inc. | Crossover valve system and method for gas production |
US20180347315A1 (en) * | 2012-10-16 | 2018-12-06 | Weatherford Technology Holdings, Llc | Flow control assembly |
US10662736B2 (en) * | 2017-02-10 | 2020-05-26 | Halliburton Energy Services, Inc. | Hydrostatic equalizing stem check valve |
US11512682B2 (en) * | 2018-04-28 | 2022-11-29 | Thomas Magnete Gmbh | Linear-acting electric pump unit and method for operating said unit |
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US10704363B2 (en) * | 2017-08-17 | 2020-07-07 | Baker Hughes, A Ge Company, Llc | Tubing or annulus pressure operated borehole barrier valve |
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Also Published As
Publication number | Publication date |
---|---|
WO2011043931A3 (en) | 2011-07-21 |
US20130327539A1 (en) | 2013-12-12 |
BR112012007724A2 (en) | 2016-08-23 |
GB2486383A (en) | 2012-06-13 |
GB201205983D0 (en) | 2012-05-16 |
NO20120432A1 (en) | 2012-05-07 |
WO2011043931A2 (en) | 2011-04-14 |
GB2486383B (en) | 2015-02-18 |
US9062514B2 (en) | 2015-06-23 |
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