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A flow control device for use in a wellbore to allow flow of formation fluid into the wellbore comprises a valve member adapted to move when disposed in the wellbore. A fluid line supplies a working fluid under pressure to move the valve member to allow the fluid to flow into the wellbore. A sensor

A flow control device for use in a wellbore to allow flow of formation fluid into the wellbore comprises a valve member adapted to move when disposed in the wellbore. A fluid line supplies a working fluid under pressure to move the valve member to allow the fluid to flow into the wellbore. A sensor in the wellbore, and associated with the fluid line, provides an indication of a position of the valve member. A method of determining a state of a flow control tool within a wellbore comprises supplying fluid under pressure to the flow control tool to move a flow control member of the tool into the state. Pressure of the supplied fluid is detected downhole. The state of the flow control device is determined from the detected pressure of the supplied fluid.

대표청구항 ▼

What is claimed is: 1. A flow control device for use in a wellbore to allow flow of formation fluid into the wellbore, comprising: a valve member adapted to move to control flow into the wellbore; a fluid line supplying a working fluid under pressure to move the valve member; a sensor in the wellbo

What is claimed is: 1. A flow control device for use in a wellbore to allow flow of formation fluid into the wellbore, comprising: a valve member adapted to move to control flow into the wellbore; a fluid line supplying a working fluid under pressure to move the valve member; a sensor in the wellbore and associated with the fluid line; and a controller that receives signals from the sensor, wherein the controller includes preprogrammed instructions for recording a sensor measurement and an associated time value for a movement of the valve member. 2. The flow control device of claim 1 wherein the valve member is adapted to move into a plurality of positions. 3. The flow control device of claim 2 wherein the device includes a first and a second fluid chamber cooperating to move the valve member to the plurality of positions in a stair-step fashion. 4. The flow control device of claim 2 wherein the plurality of positions correspond to a plurality of J-slots. 5. The flow control device of claim 1 wherein the sensor is located proximate the valve member, and wherein the sensor is chosen from the group consisting of: (i) a pressure sensor, and (ii) a flow sensor. 6. The flow control device of claim 1 wherein the controller determines the position of the valve member based on signals received from the sensor. 7. The flow control device of claim 6 wherein the controller has a stored pressure profile relating to the position of the valve member, the controller comparing a measured pressure with the stored pressure profile to determine the position of the valve member. 8. The flow control device of claim 6 wherein the controller determines the position of the valve member by comparing signals from the sensor with a predetermined signature stored in a memory associated with the controller. 9. The flow control device of claim 6 where the controller includes preprogrammed instructions for monitoring the flow of control fluid that is applied to the valve member to determine which one of the predetermined positions to which the flow control device has shifted. 10. The flow control device of claim 1 wherein the valve member has at least one intermediate position between an open position and a closed position; the sensor providing an indication of the at least one intermediate position. 11. The flow control device of claim 10 wherein the sensor measures pressure. 12. The flow control device of claim 11 further comprising a controller that receives signals from the sensor and determines a pressure associated with the at least one intermediate position. 13. The flow control device of claim 1 wherein the valve member includes a plurality of predetermined positions, and wherein the valve member is configured to shift into a selected predetermined position within the plurality of predetermined positions by controlling a time during which a pressure is applied to the valve member. 14. The flow control device of claim 1 wherein the valve member includes a j-slot valve that is configured to shift to a selected predetermined position within a plurality of predetermined positions; and wherein the controller includes preprogrammed instructions for monitoring the time during which the pressure is applied to the valve member to determine which one of the predetermined positions to which the flow control device has shifted. 15. The flow control device of claim 1 wherein the sensor is one of: (i) a pressure sensor, and (ii) a flow sensor. 16. The flow control device of claim 1 wherein the valve member is configured to shift into a selected predetermined position within the plurality of predetermined positions by controlling the flow of control fluid that is applied to the valve member. 17. A downhole flow control device comprising: a hydraulically-actuated sleeve valve that is operable between a first position wherein the valve is in a first fluid flow state and a second position wherein the valve is in a second fluid flow state; a hydraulic control line operably associated with the sleeve valve for the supply of hydraulic fluid to operate the valve between states; and a downhole pressure sensor operably associated with the hydraulic control line to detect fluid pressure therein to provide an indication of a position of the sleeve valve; and a controller that receives signals from the downhole pressure sensor, wherein the controller includes preprogrammed instructions for recording a pressure value and an associated time value for a movement of the sleeve valve. 18. The flow control device of claim 17 wherein the pressure sensor is located proximate the sleeve valve. 19. A method of determining a position of a flow control tool within a wellbore comprising: supplying fluid under pressure to the flow control tool to move a flow control member of the tool into the position; detecting pressure of the supplied fluid downhole; recording the detected pressure and an associated time value for a movement of the flow control member; and determining the position of the flow control device using the detected pressure of the supplied fluid and the associated time value. 20. The method of claim 19 further comprising, providing a controller at a surface location that determines the position of the flow control tool from the detected pressure and the associated time value. 21. The method of claim 20 further comprising storing in the controller a pressure profile relating to movement of the flow control member and comparing the detected pressure with the pressure profile to determine the position of the flow control tool. 22. The method of claim 19 wherein the flow control member is adapted to move to a plurality of positions. 23. The method of claim 22 further comprising detecting each of said plurality of positions from a pressure profile associated with each said state. 24. A method of determining a position of a flow control tool within a wellbore, comprising: associating a pressure profile with a movement of the flow control tool; detecting fluid flow downhole within a hydraulic supply conduit in fluid communication with the flow control tool; recording a pressure value and an associated time value for a movement of the flow control tool; and determining the position of the flow control tool from the detected fluid flow and the pressure profile. 25. The method of claim 24, wherein the fluid flow is detected with a sensor chosen from the group consisting of: (i) a pressure sensor, and (ii) a flow sensor. 26. The method of claim 24, further comprising providing a controller at a surface location that determines the position of the flow control tool from the downhole detected fluid flow. 27. The method of claim 26, further comprising storing in the controller the pressure profile relating to the movement of the flow control tool. 28. The method of claim 24, wherein the position comprises a plurality of positions and wherein the pressure profile is further associated with each of the plurality of positions. 29. A flow control device for use in a wellbore to control formation fluid flow into the wellbore, comprising: a valve member having at least one intermediate position between an open position and a closed position; a fluid line supplying a working fluid under pressure to move the valve member; a pressure sensor in the wellbore and associated with the fluid line to provide an indication of a position of the valve member, wherein the sensor provides an indication of the at least one intermediate position; and a controller that receives signals from the sensor and determines a pressure associated with the at least one intermediate position, wherein the controller associates a time value with the determined pressure.