An isolation sleeve extends from an adapter into the bore of a tubing head to isolate high pressure frac fluid from the body of the tubing head. The isolation sleeve may be installed by a running tool that can screw the sleeve onto a packoff bushing located within the tubing head. The running tool c
An isolation sleeve extends from an adapter into the bore of a tubing head to isolate high pressure frac fluid from the body of the tubing head. The isolation sleeve may be installed by a running tool that can screw the sleeve onto a packoff bushing located within the tubing head. The running tool can also retrieve the isolation sleeve by unscrewing it from the packoff bushing.
대표청구항▼
1. A wellhead apparatus, comprising: a wellhead member having a vertical bore for receiving an upper end of a string of conduit extending into a well, the bore of the wellhead member having a downward facing shoulder;a packoff bushing within the bore of the wellhead member and having an external upw
1. A wellhead apparatus, comprising: a wellhead member having a vertical bore for receiving an upper end of a string of conduit extending into a well, the bore of the wellhead member having a downward facing shoulder;a packoff bushing within the bore of the wellhead member and having an external upward facing shoulder below the downward facing shoulder, preventing upward movement of the packoff bushing within the wellhead member, the bushing having a vertical bore adapted to closely receive the upper end of the conduit, the bore in the bushing having a set of threads;an annular packoff seal within the bore of the bushing for sealing against an outer diameter of the conduit;a sleeve carried within the bore of the wellhead member, the sleeve having a threaded outer profile that is secured to the threads in the bore of the bushing; and wherein the sleeve isolates the bore of the wellhead member from high pressure fluid injected into the sleeve,the sleeve has a passage with a circumferential groove formed in the passage adjacent an upper end of the sleeve for allowing engagement with a lug of a running tool, andthe sleeve has a plurality of slots formed in the passage extending from the upper end of the sleeve toward the circumferential groove, a portion of each of the slots intersecting with the circumferential groove to allow disengagement of the lug on the running tool when aligned with the one of the slots; anda vertical shoulder located adjacent to each slot within the circumferential groove for providing a reaction point for the lug on the running tool to rotate the sleeve during installation and retrieval, the shoulder being positioned closer to one of the slots than an adjacent slot such that when engaged by the lug during rotation while installing the sleeve, the lug will be misaligned with any of the slots, and when engaged by the lug during rotation to retrieve the sleeve, the lug will be aligned with one of the slots. 2. The apparatus according to claim 1, further comprising a recess within the bore of the wellhead member corresponding to an outer profile of the packoff bushing for receiving a retaining member that retains the packoff bushing within the wellhead member. 3. The apparatus according to claim 1, further comprising an anti-rotation member between the wellhead member and the packoff bushing for preventing the packoff bushing from rotating during the installation or retrieval of the sleeve. 4. The apparatus according to claim 1, wherein the passage of the sleeve contains a set of threads;wherein the apparatus further comprises a backpressure valve having a corresponding set of threads that secure to the threads in the passage of the sleeve; andwherein the threads in the passage of the sleeve have the same thread pattern as the set of threads in the bore of the packoff bushing to allow threading of the backpressure valve into either the packoff bushing or the sleeve. 5. The apparatus according to claim 1, wherein the packoff bushing has a passage containing a set of threads;wherein the apparatus further comprises a backpressure valve having a corresponding set of threads that secure to the threads in the bore of the packoff bushing;wherein the threads in the bore of the packoff bushing have the same thread pattern as a set of threads in a passage of the sleeve to allow threading of the backpressure valve into either the packoff bushing or the sleeve. 6. The apparatus according to claim 1, further comprising a profile formed at an upper end of the sleeve for releasable engagement by a running tool to support and rotate the sleeve. 7. The apparatus according to claim 1, further comprising: an adapter mounted and sealed to an upper end of the wellhead member, the adapter having a bore that is coaxial with the bore of the wellhead member and receives an upper end of the sleeve, the adapter having an upper end adapted to support a fluid injection valve; anda seal in the bore of the adapter that seals against an outer diameter of the sleeve. 8. The apparatus according to claim 7, wherein the adapter comprising a flange that overlies a flange on an upper end of the wellhead member, the flange on the wellhead member containing bolt hole pattern; andwherein the apparatus further comprises a plurality of threaded studs rigidly mounted in the flange of the adapter, the studs extending downward from the flange of the adapter and through the bolt hole pattern of the wellhead member to secure the adapter to the wellhead member, the studs extending upward from the flange of the adapter for insertion into a bolt hole pattern of a fluid injection valve. 9. The apparatus according to claim 1, further comprising a seal on an outer diameter portion of the sleeve that sealingly engages the bore of the packoff bushing at a point above the packoff seal and the threads in the bore of the packoff bushing. 10. The apparatus according to claim 1, further comprising: a stop shoulder located between the threads in the packoff bushing and the packoff seal that limits downward movement of the sleeve in the packoff bushing. 11. An apparatus for injecting fluid into a well, comprising: a sleeve having a first end and having a second end to be positioned in a bore of a wellhead member, the sleeve having a threaded outer profile on the second end, the sleeve having a profile formed at the first end of the sleeve for releasable engagement by a running tool to support and rotate the sleeve, the sleeve having a passage containing a set of threads, the sleeve having a plurality of slots formed in the bore extending from the first end of the sleeve toward the profile formed on the first end, a portion of each of the slots intersecting with the profile formed at the first end of the sleeve to allow disengagement of a lug on the running tool when aligned with the one of the slots;a pin is located adjacent to each slot for providing a reaction point for the lug on the running tool to rotate the sleeve during installation or retrieval, a passage adjacent to each slot for receiving the pin, the passage formed from the first end of the sleeve to the profile formed on the first end of the sleeve;a packoff bushing located within the wellhead member, the packoff bushing having an outer profile approximately corresponding to an inner profile of the wellhead member having a bore and located at an upper end of a well, the packoff bushing having a partially threaded bore for threadingly engaging the threaded outer profile on the second end of the sleeve; anda backpressure valve having a corresponding set of threads for threadingly engaging either the threads in the passage of the sleeve or the threaded bore of the packoff bushing. 12. The apparatus according to claim 11, further comprising a recess within the inner profile of the wellhead member corresponding to the outer profile of the packoff bushing for receiving a snap ring that retains the packoff bushing within the wellhead member. 13. The apparatus according to claim 11, further comprising an anti-rotation member between the wellhead member and the packoff bushing for preventing the packoff bushing from rotating during the installation or retrieval of the sleeve. 14. The apparatus according to claim 11, wherein a seal on an outer diameter portion of the sleeve sealingly engages the bore of the packoff bushing at a point above the packoff seal within the bore of the bushing for sealing against an outer diameter of a conduit and the threads in the bore of the packoff bushing. 15. The apparatus according to claim 11, further comprising: a stop shoulder located between the threads in the packoff bushing and the packoff seal that limits downward movement of the sleeve in the packoff bushing. 16. The apparatus according to claim 11, further comprising: a downward facing shoulder located on the wellhead member that interferes with an upward facing shoulder located on the packoff bushing to limit the upward movement of the packoff bushing within the wellhead member.
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이 특허에 인용된 특허 (9)
DeBerry,Blake T., Adjustable hanger system and method.
Singer Roy E. (Tomball TX) Lalor Richard C. (Tomball TX) Rountree Kenneth G. (Houston TX) Smedley Marcus A. (Houston TX) Miller John H. (Youngsville LA), Adjustable mandrel well casing hanger.
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