a stress joint

Abstract

The invention discloses a stress connector and belongs to the field of downhole operation equipment. The stress connector comprises a lower body, a shearing sleeve, an upper body and an upper connector, and the upper body and the lower body are both internally-hollow pipe columns. The lower end of the lower body is connected with a lower operation pipe column, the upper end of the lower body is connected with the lower end of the upper body, and the upper end of the upper body is connected with the lower end of the upper connector. The upper end of the upper connector is connected with an upper operation pipe column, the shearing sleeve is located in the lower body and the upper body, an outer step is arranged at the upper end of the shearing sleeve, and an inner step is arranged on the inner wall of the upper body. The shearing sleeve and the inner step of the upper body are fixed in a matched mode through the outer step, the lower end of the shearing sleeve is connected with the lower body, and a shearing groove is formed in the lower portion of the outer step of the shearing sleeve. According to the stress connector, when the pipe columns are lifted up, stress concentration occurs to the shearing groove to enable the upper operation pipe column and the lower operation pipe column to be disconnected, thus, the upper operation pipe column can be safely taken out when sand jamming occurs during bittern discharge operation, and the effective volume of a salt carven gas storage is not decreased.

Description

technical field [0001] The invention relates to the field of downhole operation equipment, in particular to a stress joint. Background technique [0002] After natural gas is extracted, it is usually first transported to gas storage for storage, among which salt cavern gas storage is a commonly used gas storage. The salt cavern gas storage mainly stores natural gas by injecting water into the underground salt layer and dissolving the salt layer through water to form a salt cavern. In the process of dissolving the salt layer, the insoluble matter in the salt layer accumulates at the bottom of the salt cavern, and at the same time, after the salt in the salt layer is dissolved in water, a large amount of brine is generated in the salt cavern. Before the salt cavern gas storage is used, it is necessary to discharge a large amount of brine in the salt cavern. [0003] At present, the brine in the salt cavern is usually discharged from the salt cavern through the brine discharg...

AI Technical Summary

Problems solved by technology

[0005] In the first implementation mode, since the lower end of the brine discharge pipe column lowered into the salt cavern is 2-3m away from the top of the insoluble matter accumulated at the bottom of the salt cavern, the brine in the salt cavern cannot be completely drained, thus reducing The effective volume of the salt cavern gas storage

In the second implementation mode, there is a risk of sand stuck in the brine discharge pipe string located in the wellbore, that is, the brine discharge pipe string is easily stuck, so that the brine discharge pipe string cannot be taken out

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