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Apparatus and methods for selectively and safely reversing flow in coiled tubing used for wellbore cleanouts are disclosed. One apparatus includes a section of coiled tubing having a main flow channel, at least two flow-preventing valves in the section of coiled tubing, each adapted to close the mai

Apparatus and methods for selectively and safely reversing flow in coiled tubing used for wellbore cleanouts are disclosed. One apparatus includes a section of coiled tubing having a main flow channel, at least two flow-preventing valves in the section of coiled tubing, each adapted to close the main flow channel upon attempted flow reversal; and at least one actuator adapted to deter closing of the flow-preventing valves. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

대표청구항 ▼

What is claimed is: 1. An apparatus comprising: (a) a section of coiled tubing having a main flow channel; (b) at least one flow-preventing valve in the section of coiled tubing, adapted to close the main flow channel and prevent flow through the coiled tubing upon attempted flow reversal; (c) a ch

What is claimed is: 1. An apparatus comprising: (a) a section of coiled tubing having a main flow channel; (b) at least one flow-preventing valve in the section of coiled tubing, adapted to close the main flow channel and prevent flow through the coiled tubing upon attempted flow reversal; (c) a chemical detector; and (d) at least one actuator adapted to deter closing of the flow-preventing valve. 2. The apparatus of claim 1 including a power source adapted to act on the at least one actuator and allow return to a safe mode of operation by closing the at least one flow-preventing valve. 3. The apparatus of claim 1 wherein the at least one actuator is selected from motor and solenoid actuators. 4. The apparatus of claim 3 comprising a hydraulic system used in conjunction with the at least one actuator. 5. The apparatus of claim 1 comprising surface/apparatus communication through one or more communication links. 6. the apparatus of claim 1 wherein the flow-preventing valve is selected from flapper-type check valves and dart valves. 7. The apparatus of claim 1 wherein the chemical detector comprises a hydrocarbon detector. 8. The apparatus of claim 4 wherein the hydraulic system includes a pressure lock piston and pressure lock spring combination. 9. The apparatus of claim 8 wherein the pressure lock piston is adapted to be forced to a first position by the pressure lock spring, allowing hydraulic fluid to flow freely into a compensation chamber, so that there is no pressure differential across a hydraulic fluid check valve. 10. The apparatus of claim 9 wherein the hydraulic fluid check valve is a ball and spring combination. 11. The apparatus of claim 9 wherein the pressure lock piston is adapted to move to a second position, wherein the pressure lock piston only allows flow across the hydraulic fluid check valve in one direction, from the compensation chamber into a high pressure chamber. 12. The apparatus of claim 9 wherein the pressure lock piston, normally forced to its first position by the pressure lock spring, is adapted to move to the second position when the hydraulic fluid pressure above pressure lock piston is higher than an annulus pressure below the piston, allowing the pressure lock spring to be overridden. 13. The apparatus of claim 10 wherein when a pressure differential is seen across the hydraulic fluid check valve, a solenoid is activated, causing its actuator to move toward the ball to roll the ball off its seat and release the hydraulic pressure. 14. The apparatus of claim 8 comprising a compensating piston adapted to provide an adequate supply of hydraulic fluid for the hydraulic system. 15. The apparatus of claim 4 wherein the at least one actuator is a motor adapted to produce a linear stroke to move a linear motion drive shaft attached to a piston head of a movable valve gate, and an annulus bypass piston adapted to move into and out of an annular flow bypass chamber, allowing a reverse cleaning procedure through the coiled tubing main flow channel, bypassing the at least one flow-preventing valve. 16. The apparatus of claim 4 wherein the at least one actuator comprises a first solenoid, adapted to selectively create a high pressure differential and charge the hydraulic system to selectively allow reverse flow of well debris and fluids through the main flow channel, bypassing the at least two flow-preventing valves, and a second solenoid adapted to release the stored hydraulic pressure when desired. 17. The apparatus of claim 4 wherein the at least one actuator is a motor adapted to produce a linear stroke to move a linear motion drive shaft attached to a piston head of a movable valve gate, and an annulus bypass piston adapted to move into and out of an inline flow bypass chamber, allowing a reverse cleaning procedure through a second coiled tubing flow channel, bypassing the at least one flow-preventing valve. 18. The apparatus of claim 4 wherein the at least one actuator comprises a first solenoid, adapted to selectively create a high pressure differential and charge the hydraulic system to selectively allow reverse flow of well debris and fluids through a second coiled tubing flow channel, bypassing the at least two flow-preventing valves, and a second solenoid adapted to release the stored hydraulic pressure when desired. 19. The apparatus of claim 4 wherein the at least one actuator is a motor adapted to produce a linen stroke to move a linear motion drive shaft attached to a piston head of a movable valve gate, and dual flapper actuators and, each having a notch and allowing a reverse cleaning procedure through the main coiled tubing flow channel, overriding the at least one flow-preventing valve. 20. The apparatus of claim 4 wherein the at least one actuator comprises a first solenoid, adapted to selectively create a high pressure differential and charge the hydraulic system to selectively actuate one or more pistons to allow reverse flow of well debris and fluids through the main coiled tubing flow channel, overriding the at least two flow-preventing valves, and a second solenoid adapted to release the stored hydraulic pressure when desired. 21. The apparatus of claim 4 wherein the at least one actuator is a motor adapted to have a first motor position that closes a hydraulic flapper valve and charge the hydraulic system, the hydraulic system adapted to move a push sleeve against spring pressure exerted by a push sleeve spring against a flange connected to the sleeve, the push sleeve having a distal end adapted to push open the flow-preventing valves. 22. The apparatus of claim 4 wherein the at least one actuator comprises a first solenoid adapted to close a hydraulic flapper valve and charge the hydraulic system, the hydraulic system adapted to move a push sleeve against spring pressure exerted by a push sleeve spring against a flange connected to the sleeve, the push sleeve having a distal end adapted to push open the two or more flow-preventing valves, and a second solenoid adapted to selectively release the hydraulic pressure and return push sleeve to its original position. 23. A reversing tool comprising: (a) a section of coiled tubing having a main flow channel; (b) at least one flow-preventing valve in the section of coiled tubing, adapted to close the main flow channel and prevent flow through the coiled tubing upon attempted flow reversal; (c) a chemical detector; (d) at least one actuator adapted to deter closing of the flow-preventing valve; (e) a hydraulic system used in conjunction with the at least one actuator; and (f) a local power source adapted to de-pressurize the hydraulic system in the event of power or communications failure. 24. The reversing tool of claim 23 wherein the at least one actuator is a motor adapted to produce a linear stroke to move a liner motion drive shaft attached to a piston head of a movable valve gate, and an annulus bypass piston adapted to move into and out of an annular flow bypass chamber, allowing a reverse cleaning procedure through the coiled tubing main flow channel, bypassing the at least one flow-preventing valve. 25. The reversing tool of claim 23 wherein the at least one actuator comprises a first solenoid, adapted to selectively create a high pressure differential and charge the hydraulic system to selectively allow reverse flow of well debris and fluids through the main flow channel, bypassing the at least two flow-preventing valves, and a second solenoid adapted to release the stored hydraulic pressure when desired. 26. The reversing tool of claim 23 wherein the at least one actuator is a motor adapted to produce a linear stroke to move a liner motion drive shaft attached to a piston head of a movable valve gate, and an annulus bypass piston adapted to move into and out of an inline flow bypass chamber, allowing a reverse cleaning procedure through a second coiled tubing flow channel, bypassing the at least two flow-preventing one flow-preventing valve. 27. The reversing tool of claim 23 wherein the at least one actuator comprises a first solenoid, adapted to selectively create a high pressure differential and charge the hydraulic system to selectively allow reverse flow of well debris and fluids through a second coiled tubing flow channel, bypassing the at least two flow-preventing valves, and a second solenoid adapted to release the stored hydraulic pressure when desired. 28. The reversing tool of claim 23 wherein the at least one actuator is a motor adapted to produce a linear stroke to move a linear motion drive shaft attached to a piston head of a movable valve gate, and dual flapper actuators and, each having a notch and allowing a reverse cleaning procedure through the main coiled tubing flow channel, overriding the at least one flow-preventing valve. 29. The reversing tool of claim 23 wherein the at least one actuator comprises a first solenoid, adapted to selectively create a high pressure differential and charge the hydraulic system to selectively actuate one or more pistons to allow reverse flow of well debris and fluids through the main coiled tubing flow channel, overriding the at least two flow-preventing valves, and a second solenoid adapted to release the stored hydraulic pressure when desired. 30. The reserving tool of claim 23 wherein the at least one actuator is a motor adapted to have a first motor position that closes a hydraulic flapper valve and charge the hydraulic system, the hydraulic system adapted to move a push sleeve against spring pressure exerted by a push sleeve spring against a flange connected to the sleeve, the push sleeve having a distal end adapted to push open the flow-preventing valve. 31. The reversing tool of claim 23 wherein the at least one actuator comprises a first solenoid adapted to close a hydraulic flapper valve and charge the hydraulic system, the hydraulic system adapted to move a push sleeve against spring pressure exerted by a push sleeve spring against a flange connected to the sleeve, the push sleeve having a distal end adapted to push open the two or more flow-preventing valves, and a second solenoid adapted to selectively releases the hydraulic pressure and return push sleeve to its original position. 32. The reversing tool of claim 23 wherein the chemical detector comprises a hydrocarbon detector. 33. A method comprising: (a) inserting a coiled tubing having a main flow channel into a bore hole, the coiled tubing comprising a section of coiled tubing having at least one flow-preventing valve; (b) flowing a fluid through an annulus between the coiled tubing and the well bore; (c) reversing flow through the coiled tubing by actuating at least one actuator to deter closing of the flow-preventing valves; and (d) detecting one or more chemicals in the reversed flow. 34. The method of claim 33 wherein detecting comprises detecting chemicals with a chemical detector. 35. The method of claim 34 wherein the detecting comprises detecting chemicals with a hydrocarbon detector.