Full-diameter switchable cementing sliding sleeve and method for infinite-stage alternate fracturing in horizontal wells

Abstract

The invention discloses a full-diameter switch cementing sliding sleeve and a method for infinite-stage alternate fracturing in horizontal wells, including an upper joint, an outer casing, an inner sliding sleeve, and a lower joint. The fracturing hole and the fracturing hole of the inner sliding sleeve are provided with an upper annular groove, a T-shaped chute, and a lower annular groove in sequence on the outer casing, and an electromagnet I and an electromagnet II are respectively arranged in the upper annular groove and the lower annular groove. The electromagnet Ⅰ and electromagnet Ⅱ are equipped with ring circuits, and the upper and lower ends of the outer casing are respectively equipped with control circuit power supply Ⅰ and control circuit power supply Ⅱ; block, the inner wall of the outer casing is provided with a circlip groove, and the outer wall of the inner sliding sleeve is provided with a circlip. At the same time, the present invention can open and close the fracturing channel at any certain position, realize alternate sequential fracturing, increase the interference between fractures, and form a complex fracture network. Simultaneously carry out oil and gas production operations.

Description

technical field [0001] The invention relates to a full-diameter switch cementing sliding sleeve and a method for infinite-stage alternate fracturing of horizontal wells, and belongs to the technical field of downhole tools for oil and gas exploitation. Background technique [0002] Unconventional oil and gas reservoirs such as shale oil and gas and tight sandstone oil and gas have tight rocks, low porosity, and extremely low permeability. Horizontal well staged multi-cluster fracturing technology must be used to transform the reservoir, which is different from the traditional reservoir stimulation concept. It uses volumetric fracture network fracturing technology to break up the reservoir, form a complex fracture network, increase the contact area between the fracture wall and the matrix, improve the fracture conductivity, and realize production increase. Alternate fracturing is one of the volumetric fracture network fracturing techniques. Using the stress disturbance genera...

AI Technical Summary

Problems solved by technology

Since the ball-pitching sliding sleeve is opened in the form of a ball-shearing pin, it cannot be opened again after the fracturing channel is closed. Secondly, there is a risk of opening the sliding sleeve in advance when the rubber plug passes. At the same time, because the number of fracturing stages is limited by the size of the ball, it cannot be realized without Differential fracturing, alternate fracturing operations cannot be performed, and it is difficult to form complex fracture networks

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