Oil and gas well staged fracturing drillable ball sliding sleeve

Abstract

The invention discloses a drillable ball injection sliding sleeve for oil-gas well staged fracturing, which comprises an upper main body, a middle main body, a lower main body, a movable sleeve arranged on the inner side of the middle main body, wherein the movable sleeve is connected with the middle main body through a shear pin; a locating clamp spring is mounted in a cavity between the movable sleeve and the middle main body; a guide groove is arranged on the outer side of the movable sleeve; a guide pin is arranged on the middle main body and extends out of the bottom of the guide groove into the guide groove; a drillable ball seat is mounted on a boss formed at the bottom part of the movable sleeve; a low density ball is arranged in the drillable ball seat in a setting manner; guide pipes extending downwards are arranged at the lower ends of the upper main body and the movable sleeve respectively; circulation openings are formed at the upper part of the middle main body; and a plurality of communication openings are formed at corresponding positions on an extension pipe of the upper main body; and the distance between the upper end of the movable sleeve and the lower part of the communication openings is equivalent to that between the lower end of the movable sleeve and the upper end of the lower main body. Through the sliding sleeve, the selective fracturing reformation and commingled production can be realized without moving pipe columns, meanwhile fracturing at each layer is performed in sequence, the operation risk is low, and the fracturing construction time is greatly reduced.

Description

technical field [0001] The invention relates to an oil and natural gas exploitation tool, in particular to a drillable ball-throwing sliding sleeve for segmental fracturing of oil and gas wells. Background technique [0002] As domestic oilfields gradually enter the middle and late stages of exploration and development, the difficulty and cost of exploration and development have increased significantly. Research and application of efficient techniques and measures for stabilizing and increasing production has become the only way for the development and growth of various oilfields. Research and application practice at home and abroad have proved that horizontal well technology can greatly increase the length of the wellbore in the production layer and the oil drainage area of ​​the production layer compared with vertical wells, increase oil and gas production, slow down the advancement speed of water cones and gas cones, and its exploration and development The effect is equiv...

AI Technical Summary

Problems solved by technology

However, when the horizontal section of the horizontal well is long and the number of oil layers to be stimulated is large, it is not possible to reconstruct all the target layers through one flow-limiting construction.

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