One-pass threaded removable ball seat sleeve

Abstract

The invention discloses a threaded sliding sleeve with a ball seat capable of being taken out. The threaded sliding sleeve comprises a sliding sleeve body, an inner sliding sleeve and a ball seat cylinder, wherein the sliding sleeve body is composed of an upper connector, an outer cylinder and a lower connector, a fluid outlet hole is formed in the upper portion of the outer cylinder, and a clamp spring hole is formed in the lower position of the middle of the inner wall of the outer cylinder; a switch clamp groove is formed in the inner wall of the upper portion of the inner sliding sleeve, a locking ring groove is formed in the inner wall of the middle of the inner sliding sleeve, a locking ring is fixed at the lower portion of the locking ring groove, the length of the locking ring is smaller than that of the locking ring groove, a clamp spring is installed on the outer wall of the middle of the inner sliding sleeve, and an anti-rotating groove extending in the axial direction is formed in the outer wall of the lower portion of the inner sliding sleeve; a sliding sleeve shear pin is installed at the position, corresponding to the lower end of the anti-rotating groove, on the outer cylinder, and the upper end of the sliding sleeve shear pin stretches into the anti-rotating groove; threads are formed on the inner side of the upper end of the ball seat cylinder and on the outer side of the lower end of the ball seat cylinder, the outer diameter of the lower end of the ball seat cylinder is the same with the inner diameter of the upper end of the ball seat cylinder, a ball seat locking ring groove is formed in the outer periphery of the ball seat cylinder, and the inner side of the locking ring stretches into the ball seat locking ring groove. Salvage of all ball seat cylinders in a tubular column can be achieved, and a full path of an underground pipe string is achieved.

Description

Technical field [0001] The invention relates to the field of oil and gas field exploitation, in particular to a desirable ball seat sliding sleeve used in a staged fracturing technology. Background technique [0002] At present, multi-stage fracturing of horizontal wells in oil and gas fields generally adopts special oil layer drilling technology and suspended packers, sliding sleeves, open hole packers and supporting tools to achieve multi-stage fracturing, or cementing sliding sleeves and supporting tools are used for cementing. Multi-stage fracturing. Horizontal well staged fracturing sliding sleeves include ball-throwing sliding sleeves and differential opening sliding sleeves. The ball-throwing sliding sleeve technology is to open the sliding sleeve of the fracturing switch by throwing a low-density ball, exposing the communication hole between the oil layer and the tubing. Tubing and oil layer. Compared with the differential pressure sliding sleeve, the pitching sliding s...

AI Technical Summary

Problems solved by technology

In response to this situation, after the fracturing construction, the inner ball seat fishing tool can be lowered to salvage all the inner ball seats at one time, so as to reduce the fishing time and greatly improve the work efficiency. Finally, there will be residual parts in the pipe string that cannot be discharged, which will cause inconvenience to the entry of subsequent tools

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