Special screwed joint for gas injection and production of underground gas storage

A special threaded and external threaded joint technology, applied in the direction of threaded connections, pipes/pipe joints/fittings, passing elements, etc., can solve the problem of poor sealing performance, easy slippage of round threads, and inability to meet the requirements of gas injection and production in underground gas storage. Air requirements and other issues, to achieve good sealing ability, enhance safety and reliability, the effect of small taper
CN102829269BActive Publication Date: 2014-06-04BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2014-06-04

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Abstract

The invention discloses a special screwed joint for gas injection and production of an underground gas storage, which belongs to the field of natural gas storage and transportation. The special screwed joint comprises an external screwed joint and an internal screwed joint which are assembled together, wherein the assembling parts of the special screwed joint are thread meshing sections and a main sealing section, and the thread meshing section is connected with the main sealing section; the threads of the thread meshing sections of both the external screwed joint and the internal screwed joint are hooked deep toothed threads; and the main sealing section is a multi-seal, and comprises two groups of conical surfaces / conical surface seals, a group of cylindrical surfaces / cylindrical surface seals and a group of cylindrical surfaces / spherical surface seals. With the special screwed joint, the sealing capability of the screwed joint which bears stretching, compressing and bending loads can be improved, and the safety and reliability of the screwed joint during the gas injection and production operations of the underground gas storage are enhanced.
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Description

technical field

[0001] The invention relates to the field of natural gas storage and transportation, in particular to a special threaded joint for gas injection and gas recovery in an underground gas storage. Background technique

[0002] Underground gas storage can adjust seasonal peak and valley differences in gas consumption, or ensure the continuity of gas supply in the event of an accident. At present, more than 600 underground gas storages have been built in 35 countries and regions around the world, and 2 gas storage wells have been built. Many countries attach great importance to the development and use of underground gas storage.

[0003] During the operation of the underground gas storage, the injection and production of gas alternate frequently periodically, and the gas flows in both directions in the pipe string and between the formations. The pipe string must bear complex loads. The temperature difference of the formation causes the pipe string to bear temperat...

Claims

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