Full-bore switch well cementation sliding sleeve and method for infinite-level alternate fracturing of horizontal well

Abstract

The invention discloses a full-bore switch well cementation sliding sleeve and method for infinite-level alternate fracturing of a horizontal well. The full-bore switch well cementation sliding sleeve comprises an upper connector, an outer sleeve, an inner sliding sleeve and a lower connector; the outer sleeve and the inner sliding sleeve are provided with an outer sleeve fracturing hole and an inner sliding sleeve fracturing hole correspondingly; the outer sleeve is sequentially provided with an upper annular groove, a T-shaped sliding groove and a lower annular groove; the upper annular groove and the lower annular groove are internally provided with an electromagnet I and an electromagnet II correspondingly; the electromagnet I and the electromagnet II are both sleeved with annular circuits; the upper end and the lower end of the outer sleeve are provided with a control circuit power source I and a control circuit power source II correspondingly; the inner sliding sleeve is provided with a sliding block capable of sliding in the T-shaped sliding groove; the inner wall of the outer sleeve is provided with a clamp spring groove; and the outer wall of the inner sliding sleeve is provided with a clamp spring. According to the full-bore switch well cementation sliding sleeve and method for infinite-level alternate fracturing of the horizontal well, a fracturing channel at any position can be opened and closed at the same time, alternate sequential fracturing is achieved, the interference effect between fractures is improved, and a complex fracture net is formed; and after all the fractures are fractured, the fracturing channel is opened completely, and oil and gas production operation is conducted synchronously.

Description

Technical field [0001] The present invention relates to a smoothly ventilated surface of the alternating fracturing of horizontal wells, which belongs to the technical field of petroleum natural gas mining well. Background technique [0002] Shale oil, dense sandstone oil, etc. Very oil storage layer due to rock dense, porosity, and extremely low permeability, the reservoir must be retrofitted through the horizontal well segment multi-cluster fracturing process, and the traditional reservoir reform concept is different. It is a transformation of a fracturing technology using a volumetric seam screen, breaking the reservoir, forming a complex crack network, increasing the contact area of ​​the crack wall and the matrix, improve the crack flow capacity, and achieve production. The alternating fracturing is used as one of the volumetric seam fracturing technology, and the stress disturbance generated by the first segment fracturing crack and the second segment fracturing seam is use...

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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