초록 ▼

An isolation string having: an upper packer; and an isolation pipe in mechanical communication with the upper packer, wherein the isolation pipe comprises a pressure activated valve and an object activated valve. A method having: running-in an isolation string on a service tool, wherein the isolatio

An isolation string having: an upper packer; and an isolation pipe in mechanical communication with the upper packer, wherein the isolation pipe comprises a pressure activated valve and an object activated valve. A method having: running-in an isolation string on a service tool, wherein the isolation string comprises a pressure activated valve and a object activated valve; setting the isolation string in the casing adjacent perforations in the casing; releasing an object from the service tool, whereby the object travels to the object activated valve; closing the object activated valve with the released object; and withdrawing the service tool from the well.

대표청구항 ▼

What is claimed is: 1. An isolation string comprising: an upper packer; a pressure activated, double-sub valve comprising first and second concentric subs, wherein said double-sub valve is in mechanical communication with the upper packer; an isolation pipe in mechanical communication with the firs

What is claimed is: 1. An isolation string comprising: an upper packer; a pressure activated, double-sub valve comprising first and second concentric subs, wherein said double-sub valve is in mechanical communication with the upper packer; an isolation pipe in mechanical communication with the first sub of said double-sub valve, wherein said isolation pipe comprises an object activated valve; a production pipe in mechanical communication with the second sub of said double-sub valve; and wherein each of the packer, double-sub valve, isolation pipe and production pipe are associated with the isolation string and not with a service tool that may be used with the isolation string. 2. An isolation string as claimed in claim 1, wherein said double-sub valve is an annulus-to-annulus flow valve comprising: an upper annulus defined by upper outer and inner tubes, wherein the upper inner tube is concentric within the upper outer tube; a lower annulus defined by lower inner and outer tubes, wherein the lower inner tube is concentric within the lower outer tube; a sleeve positioned within said upper and lower inner tubes, wherein said sleeve is configurable in at least locked-closed, unlocked-closed and open configurations, wherein said sleeve partially defines a port between said upper and lower annuluses in the open configuration and defines a seal between said upper and lower annuluses in the locked-closed and unlocked-closed configurations; and a pressure chamber which communicates with said sleeve to move said sleeve from the locked-closed configuration to the unlocked-closed configuration. 3. An isolation string as claimed in claim 1, wherein said double-sub valve is an annulus-to-interior valve comprising: an outer tube; an inner tube concentrically positioned within said outer tube; at least one port between an interior of the inner tube and an annulus between the inner and outer tubes; a sleeve positioned within said inner tube, wherein said sleeve is configurable in at least locked-closed, unlocked-closed and open configurations, wherein said sleeve covers said at least one port in the locked-closed and unlocked-closed configurations and said sleeve does not cover said at least one port in the open configuration; and a pressure chamber which communicates with said sleeve to move said sleeve from the locked-closed configuration to the unlocked-closed configuration. 4. An isolation string as claimed in claim 1, wherein said object activated valve comprises: a tube having at least one opening; a sleeve having at least one other opening and being movably connected to said tube, wherein the at least one opening and the at least one other opening are adjacent in an open configuration and nonadjacent in a closed configuration; and an object seat in mechanical communication with said sleeve, wherein said seat receives an object for manipulating the valve between the open and closed configurations. 5. An isolation string as claimed in claim 1, wherein said isolation pipe is stingable into another isolation string. 6. An isolation string as claimed in claim 1, wherein said production pipe is stingable into another isolation string. 7. An isolation string as claimed in claim 1, further comprising a production screen attached to the production pipe, wherein fluid passing through the production screen is communicable with the double-sub valve and the object activated valve. 8. An isolation string as claimed in claim 1, further comprising a lower packer in mechanical communication with said isolation pipe. 9. An isolation string for multiple zone isolations, said string comprising: a lower isolation section and an upper isolation section, said lower isolation section comprising: a lower section upper packer, and a lower section isolation pipe in mechanical communication with the lower section upper packer, wherein said lower section isolation pipe comprises a pressure activated valve and a lower section object activated valve, said upper isolation section comprising: an upper section upper packer; a double-sub valve comprising first and second concentric subs, wherein said double-sub valve is in mechanical communication with the upper section upper packer; an upper section isolation pipe in mechanical communication with the first sub of said double-sub valve, wherein said isolation pipe comprises an upper section object activated valve; and a production pipe in mechanical communication with the second sub of said double-sub valve, wherein the upper section isolation pipe and the production pipe sting into the lower section upper packer. 10. An isolation string for multiple zone isolations, said string comprising: a lower isolation section and an upper isolation section, said lower isolation section comprising: a lower section upper packer; a lower section double-sub valve comprising first and second concentric subs, wherein said lower section double-sub valve is in mechanical communication with the lower section upper packer; an lower section isolation pipe in mechanical communication with the first sub of said double-sub valve, wherein said lower section isolation pipe comprises an lower section object activated valve; and a lower section production pipe in mechanical communication with the second sub of said double-sub valve, said upper isolation section comprising: an upper section upper packer; a double-sub valve comprising first and second concentric subs, wherein said double-sub valve is in mechanical communication with the upper section upper packer; an upper section isolation pipe in mechanical communication with the first sub of said double-sub valve, wherein said isolation pipe comprises an upper section object activated valve; and a production pipe in mechanical communication with the second sub of said double-sub valve, wherein the upper section isolation pipe and the production pipe sting into the lower section upper packer. 11. An isolation system for a production zone in a well comprising: a first packer adjacent one end of the production zone; a second packer adjacent another end of the production zone; and a conduit coupled between the first and second packers and comprising a pressure activated valve and an object activated valve, and a production screen, such that each of the packers and conduit are unassociated with a removable service tool, and a fluid from between the two packers and the exterior of the production screen is communicable with the pressure activated valve and the object activated valve. 12. The isolation system of claim 11 wherein the production screen is coupled to a screen pipe separate from the pressure activated valve and the object activated valve. 13. The isolation system of claim 11, wherein said production screen is coupled about the pressure activated valve and the object activated valve. 14. The isolation system of claim 11, wherein the pressure activated valve comprises first and second concentric subs. 15. The isolation system of claim 14, wherein the conduit is coupled with the first sub and further comprising a production pipe coupled with the second sub. 16. The isolation system of claim 15, wherein the pressure activated valve is adapted to facilitate annulus-to-annulus flow of the fluid. 17. The isolation system of claim 15, wherein the pressure activated valve is adapted to facilitate annulus-to-interior flow of the fluid. 18. The isolation system of claim 11, wherein the object activated valve is closed by contacting the valve with an object released from a service tool. 19. The isolation system of claim 18, wherein the pressure activated valve is initially biased closed and closing the object activated valve isolates the production zone. 20. A method for isolating a production zone of a well, comprising: running in the well on a service tool, an isolation string comprising a first packer, a pressure activated valve, an object activated valve, and a production screen and wherein the object activated valve is not associated with the service tool; setting the first packer of the isolation string in the well adjacent perforations in the well; releasing an object from the service tool; contacting the object activated valve with the released object to activate the object activated valve to a closed condition; and withdrawing the service tool from the isolated production zone. 21. The method of claim 20, wherein the production screen is coupled to a screen pipe separate from the pressure activated valve and the object activated valve. 22. The method of claim 20, wherein said production screen is coupled about the pressure activated valve and the object activated valve. 23. The method of claim 20, wherein the pressure activated valve comprises first and second concentric subs. 24. The method of claim 23, wherein the string is coupled with the first sub and further comprising coupling a production pipe with the second sub. 25. The method of claim 24, further comprising communicating well fluid from an annulus to another annulus through the pressure activated valve. 26. The method of claim 24, further comprising communicating well fluid from an annulus to an interior of the isolation string. 27. The method of claim 20, further comprising repeating the method for a subsequent production zone.