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

An infinite-stage, horizontal well technology, applied in wellbore/well components, wellbore/well valve devices, production fluids, etc., can solve the problem that it is difficult to form complex fracture networks, cannot perform alternate fracturing operations, and cannot achieve stepless Fracturing and other issues

Active Publication Date: 2021-08-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0032] The technical solutions of the present invention will be described below in conjunction with the drawings, as will be described, as described herein is an embodiment of the invention, not all of the embodiments. Based on the embodiments of the present invention, there are all other embodiments obtained without making creative labor without making creative labor premises.

[0033] In the description of the invention, it is to be described in the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "within", "outside", etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, is merely intended to describe the present invention and simplified description, rather than indicating or implying that the device or component must have a specific orientation. Construct and operation, so it is not understood to be the limitation of the invention. Moreover, the term "first", "second", ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/14E21B43/26E21B47/06
CPCE21B34/14E21B43/26E21B47/06
Inventor 易良平钟鹏杨兆中李小刚朱静怡
Owner SOUTHWEST PETROLEUM UNIV
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