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A valve for use in fracing through cement casing in a well allows for flow of cement down the well during the cementing process and in the open position allows for fracing fluid to be directed through the cement casing for fracturing the formation adjacent the valve. The valve is constructed so as t

A valve for use in fracing through cement casing in a well allows for flow of cement down the well during the cementing process and in the open position allows for fracing fluid to be directed through the cement casing for fracturing the formation adjacent the valve. The valve is constructed so as to reduce the likelihood of the valve to jam as a result of cement or other foreign material.

대표청구항 ▼

1. A valve comprising: a housing having one or more openings,a mandrel having one or more openings positioned within the housing,a sliding sleeve disposed between the housing and the mandrel and blocking fluid communication between the openings in the housing and the openings in the mandrel when the

1. A valve comprising: a housing having one or more openings,a mandrel having one or more openings positioned within the housing,a sliding sleeve disposed between the housing and the mandrel and blocking fluid communication between the openings in the housing and the openings in the mandrel when the valve is in the closed position and permitting fluid flow between the openings in the mandrel and the openings in the housing when the valve is in the open position; andone or more rupture disks disposed in a wall of the mandrel. 2. A valve according to claim 1 wherein the housing, the mandrel, and the sleeve are tubular members. 3. A valve as claimed in claim 1 further comprising a locking ring holder attached to the sliding sleeve and a locking ring positioned within the locking ring holder. 4. A valve as claimed in claim 3 further including a ratcheting teeth on the outer surface of the mandrel adapted to engage with ratcheting teeth on the locking ring. 5. A valve as claimed in claim 1 including an end connector on each end of the housing for connection in a casing string in an oil or gas well. 6. A valve as claimed in claim 1 further including a protective sleeve covering the openings in the housing. 7. A valve as claimed in claim 1, further comprising a chamber between the housing and the mandrel. 8. A valve as claimed in claim 7, wherein the sliding sleeve is disposed within the chamber. 9. A valve as claimed in claim 1, wherein a first chamber is located between the mandrel and the housing axially above the openings of the mandrel and the housing. 10. A valve as claimed in claim 9, wherein a second chamber is located between the mandrel and the housing axially below the openings of the mandrel and the housing. 11. A valve as claimed in claim 1, wherein the rupture disks are located axially above the sliding sleeve. 12. A method for actuating a valve, the method comprising: flowing a fluid through the valve, the valve comprising; a housing having one or more openings;a mandrel having one or more openings, a passageway, and a rupture disk disposed in the passageway; anda sliding sleeve disposed between the housing and the mandrel;rupturing the rupture disk at a selected fluid pressure;flowing fluid through the passageway to the sliding sleeve;moving the sliding sleeve axially downward within the valve; exiting fluid through the one or more openings of the housing and mandrel; andcracking a cement casing with the fluid. 13. The method of claim 12, further comprising pumping cement through the valve into a wellbore. 14. The method of claim 13, further comprising wiping the valve with a plug. 15. The method of claim 12, further comprising engaging permanently the sliding sleeve with the mandrel. 16. The method of claim 12, wherein the sliding sleeve is isolated between the housing and the mandrel. 17. A valve comprising: a housing having an opening;a mandrel disposed in the housing, the mandrel having an opening;a rupture disk disposed in a passageway of the mandrel, wherein the passageway is axially above the housing and mandrel openings; anda sliding sleeve disposed in a chamber formed between the housing and the mandrel. 18. The valve of claim 16, wherein the sliding sleeve is isolated from fluid flow through the valve when the valve is in a closed position. 19. A valve comprising: a housing having one or more openings;a mandrel having one or more openings disposed within the housing;a rupture disk disposed in a passageway of the mandrel, wherein the passageway is axially above the one or more housing and mandrel openings;a chamber between the housing and the mandrel; anda sliding sleeve disposed within the chamber, wherein in a closed position the sliding sleeve is isolated from fluid flow through the valve and wherein in an open position fluid flow contacts the sliding sleeve and flows through the one or more openings in the housing and the mandrel. 20. The valve of claim 19, wherein the rupture disk is configured to rupture at a selected fluid pressure, and wherein the selected fluid pressure moves the sliding sleeve within the chamber. 21. A valve comprising: a housing having one or more openings,a mandrel having one or more openings positioned within the housing,a sliding sleeve disposed between the housing and the mandrel and blocking fluid communication between the openings in the housing and the openings in the mandrel when the valve is in the closed position and permitting fluid flow between the openings in the mandrel and the openings in the housing when the valve is in the open position;a locking ring holder attached to the sliding sleeve;a locking ring positioned within the locking ring holder; anda set of ratcheting teeth on the outer surface of the mandrel adapted to engage with ratcheting teeth on the locking ring. 22. A valve as claimed in claim 21 further including a protective sleeve covering the openings in the housing. 23. A valve as claimed in claim 21, further comprising a chamber between the housing and the mandrel. 24. A valve as claimed in claim 23, wherein the sliding sleeve is disposed within the chamber. 25. A valve as claimed in claim 23, wherein the first chamber is located axially above the openings of the mandrel and the housing. 26. A valve as claimed in claim 25, wherein a second chamber is located between the mandrel and the housing axially below the openings of the mandrel and the housing. 27. A method for actuating a valve, the method comprising: flowing a fluid through the valve, the valve comprising; a housing having one or more openings;a mandrel having one or more openings, a passageway, and a rupture disk disposed in the passageway; anda sliding sleeve disposed between the housing and the mandrel:rupturing the rupture disk at a selected fluid pressure;flowing fluid through the passageway to the sliding sleeve;moving the sliding sleeve axially downward within the valve; andexiting fluid through the one or more openings of the housing and mandrel; andpumping cement through the valve into a wellbore. 28. The method of claim 27, further comprising wiping the valve with a plug. 29. The method of claim 27, further comprising engaging permanently the sliding sleeve with the mandrel. 30. The method of claim 27, wherein the sliding sleeve is isolated between the housing and the mandrel. 31. A method for actuating a valve, the method comprising: flowing a fluid through the valve, the valve comprising; a housing having one or more openings;a mandrel having one or more openings, a passageway, and a rupture disk disposed in the passageway; anda sliding sleeve disposed between the housing and the mandrel:rupturing the rupture disk at a selected fluid pressure;flowing fluid through the passageway to the sliding sleeve;moving the sliding sleeve axially downward within the valve;exiting fluid through the one or more openings of the housing and mandrel; andengaging permanently the sliding sleeve with the mandrel. 32. The method of claim 31, wherein the sliding sleeve is isolated between the housing and the mandrel.