IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0006388
(2011-01-13)
|
등록번호 |
US-8683848
(2014-04-01)
|
발명자
/ 주소 |
- Taft, Don
- Hoover, Don
- Siewell, Don
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
16 |
초록
▼
An improved hydrotest testing system comprises a safety stop which prevents the testing tools from being blown out of the top of the tubing string. The safety stop is made up into the upward facing box of the tubing joint to be tested, where the stop is positioned between the tool assembly placed wi
An improved hydrotest testing system comprises a safety stop which prevents the testing tools from being blown out of the top of the tubing string. The safety stop is made up into the upward facing box of the tubing joint to be tested, where the stop is positioned between the tool assembly placed within the tubing joint and the no-go head assembly which is located at the surface during the testing operation. Once the safety stop has been made up into upward facing box, the tool assembly is set within the joint to be tested and the joint pressure tested. The safety stop has a generally cylindrical body which has a bore extending through its length, where the bore has a reduced diameter throat which is sized smaller than portions of the downhole testing tool.
대표청구항
▼
1. An improved system for performing hydrostatic testing of oilfield tubulars as the tubulars are installed in a well, the system of the type having a tool assembly comprising a mandrel having an interior conduit and an exterior, at least two axially spaced elastomeric cups mounted on the exterior,
1. An improved system for performing hydrostatic testing of oilfield tubulars as the tubulars are installed in a well, the system of the type having a tool assembly comprising a mandrel having an interior conduit and an exterior, at least two axially spaced elastomeric cups mounted on the exterior, the system further comprising a test head attached to the tool assembly, the test head hydraulically connected to the interior conduit, fluid introduction and pressurization means hydraulically connected to the test head, a fluid discharge means from the interior conduit to the exterior, the fluid discharge means disposed between the elastomeric cups wherein the elastomeric cups are adapted to expand into the internal wall of the tubulars, the improvement comprising: a safety stop disposed between the test head and the tool assembly, the safety stop comprising a generally cylindrical body having a bore extending through its length, the cylindrical body comprising a downward facing pin and an axially-aligned upward facing box end, wherein the downward facing pin is sized to mate with an upward facing box of the tubulars, wherein the bore comprises a diameter smaller than the outside diameter of a portion of the tool assembly. 2. The improvement of claim 1 wherein the axially-aligned upward facing box end comprises rounded threads and a stabbing guide above the top thread. 3. The improvement of claim 1 wherein the generally cylindrical body further comprises an external shoulder section extending around the body. 4. The improvement of claim 1 wherein the generally cylindrical body comprises a plurality of threaded apertures and a handle member screwed into each threaded aperture. 5. The improvement of claim 1 wherein the generally cylindrical body further comprises an external shoulder section extending around the body, the external shoulder section comprising a plurality of threaded apertures, and a handle member screwed into each threaded aperture. 6. The improvement of claim 3 wherein the external shoulder section comprises a downward facing surface, said downward facing surface comprising an O-ring groove. 7. A safety stop used in combination with a hydrostatic testing apparatus for oilfield tubulars, wherein the hydrostatic testing apparatus comprises a pair of axially spaced test cups comprising an elastomeric material, wherein the test cups are mounted on a mandrel, wherein the safety stop comprises: a generally cylindrical body having a bore extending through its length, the cylindrical body comprising a downward facing pin and an axially-aligned upward facing box end, wherein the bore comprises a diameter smaller than the outside diameter of a portion of the hydrostatic test apparatus; anda plurality of outwardly extending handle members attached to the cylindrical body. 8. The safety stop of claim 7 wherein the axially-aligned upward facing box end comprises rounded threads and a stabbing guide above the top thread. 9. The safety stop of claim 7 wherein the generally cylindrical body further comprises an external shoulder section extending around the body. 10. The safety stop of claim 7 wherein the generally cylindrical body comprises a plurality of threaded apertures, a handle member screwed into each threaded aperture. 11. The safety stop of claim 7 wherein the generally cylindrical body further comprises an external shoulder section extending around the body, the external shoulder section comprising a plurality of threaded apertures, a handle member screwed into each threaded aperture. 12. The safety stop of claim 9 wherein the external shoulder section comprises a downward facing surface, said downward facing surface comprising an O-ring groove. 13. A method for preventing the non-intentional upward release of a hydrotest tool from an oilfield tubing string, the method comprising the following steps: inserting a joint of oilfield tubing into a well until a substantial portion of the joint is in the well, leaving a box end of the tubing accessible at the surface;placing a tool assembly within the portion of the joint in the well, the tool assembly comprising a mandrel having an interior conduit and an exterior, at least two axially spaced elastomeric cups mounted on the exterior, and slips attached to the mandrel, wherein a test head assembly attached to the mandrel extends above the box end of the tubing;attaching a safety stop to the box end of the tubing, the safety stop comprising a generally cylindrical body having a bore extending through its length, the cylindrical body comprising a downward facing pin and an axially-aligned upward facing box end, wherein the downward facing pin is sized to mate with the upward facing box and the bore comprises a diameter smaller than the outside diameter of a portion of the mandrel;connecting a hydraulic test line to the test head assembly and introducing a hydraulic test liquid through the hydrostatic test assembly into the joint;pressurizing the joint to a desired test pressure; andremoving the safety stop from the box end of the tubing. 14. The method of claim 13 wherein the axially-aligned upward facing box end comprises rounded threads and a stabbing guide above the top thread. 15. The method of claim 13 wherein the generally cylindrical body further comprises an external shoulder section extending around the body. 16. The method of claim 13 wherein the generally cylindrical body comprises a plurality of threaded apertures, a handle member screwed into each threaded aperture. 17. The method of claim 13 wherein the generally cylindrical body further comprises an external shoulder section extending around the body, the external shoulder section comprising a plurality of threaded apertures, a handle member screwed into each threaded aperture. 18. The method of claim 15 wherein the external shoulder section comprises a downward facing surface, said downward facing surface comprising an O-ring groove.
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