Casing thread joint with multiple sealing surfaces and thread positive angles

Abstract

The invention provides a casing thread joint with multiple sealing surfaces and thread positive angles. The joint includes a female fastener and a male fastener. The female fastener is sequentially provided with an internal thread, a female-fastener spherical sealing surface, a female-fastener conical sealing surface and a female-fastener torque table shoulder surface from left to right. The malefastener is sequentially provided with an external thread, a male-fastener column-shaped sealing surface, a male-fastener conical sealing surface and a male-fastener torque table shoulder surface fromleft to right. The female fastener and the male fastener are meshed together through the internal thread and an external thread, the female-fastener spherical sealing surface makes close contact withthe male-fastener column-shaped sealing surface, the female-fastener conical sealing surface makes close contact with the male-fastener conical sealing surface, the female-fastener torque table shoulder surface makes close contact with the male-fastener torque table shoulder surface, and the inner surface of the sealing end of the male fastener is provided with a cylindrical surface and a circular conical surface. The casing thread joint solves the problem that in the prior art, a casing thread joint has seal failure under the effects of high-pressure cyclic load and high-pressure load insideand outside a pipe.

Description

technical field [0001] The invention relates to a casing threaded joint, in particular to a casing threaded joint with positive thread angles on multiple sealing surfaces. Background technique [0002] In recent years, with the depletion of old oil and gas wells and the more complex geological conditions in the area where new oil and gas wells are located, as the production depth of oil and gas wells has become deeper and deeper, the depth of casing cementing has become larger and larger. The pressure is also increasing. In this way, the safety and sealing performance of the casing, especially the sealing performance, are required to be higher and higher. [0003] At present, during the production of oil and gas wells, as the well gets deeper and deeper, the cementing casing will fail under the action of tension and compression high-pressure cyclic loads, which will cause great economic losses to the construction unit and Party A. . Contents of the invention [0004] Th...

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Problems solved by technology

[0004] The present invention provides a casing threaded joint with positive thread angles on multiple sealing surfaces to solve the problem of sealing failure of casing joints in the prior art under the action of high-pressure cyclic loads and high-pressure loads inside and outside the pipe.

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