Method for preventing rock burst through staged fracturing of L-shaped ground horizontal well

Abstract

The invention discloses a method for preventing rock burst through staged fracturing of an L-shaped ground horizontal well. The method comprises the following steps that the fracturing layer position and the fracturing interval are determined. An L-shaped horizontal well vertical shaft section is constructed on the ground, and a sleeve is embedded to fix the well wall. Deflecting is started at the design point A, the design point A extends to the fracturing layer position, and when drilling is conducted to the horizontal direction, the horizontal section of the 1 # well is started to be constructed; the horizontal section of the 1 # well is fractured in a retreating mode; the deflecting section of the 1 # well is blocked, then the vertical shaft is extended, deflecting in the reverse direction is started at the position not smaller than 10 m below the design point A and extends to the fracturing layer position, and when drilling is conducted to the horizontal direction, the horizontal section of the 2 # well is started to be constructed; and the horizontal section of the well 2 # is fractured in a retreating mode. According to the method, high-pressure hydraulic staged fracturing is carried out on the hard and difficult-to-collapse rock stratum covered on the coal face, so that the rock stratum collapses regularly, rock burst of the coal face caused by large-area suspended roof sudden striding and falling of the rock stratum is avoided, and safe and efficient mining of a mine is achieved.

Description

technical field [0001] The invention belongs to the technical field of methods for preventing and controlling impact disasters in coal mining working faces, and in particular relates to a method for preventing and controlling rock burst by staged fracturing of L-shaped ground horizontal wells. Background technique [0002] As one of the main disasters faced by coal mining in deep mines, rock burst has intensified in China in recent years, causing immeasurable losses to mines and personnel. According to statistics, the roof-type rock burst on the coal mining face in deep mines accounts for more than three-quarters of the accidents on the coal mining face. The sudden drop of large-area suspended roof produces large dynamic load, and the high static load of superimposed working face induces rock burst in coal mining face. Therefore, how to avoid large-area suspended roof with hard roof in coal mining face has become the main research to solve the problem of roof burst directio...

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Problems solved by technology

[0003] The object of the present invention is to provide a method for preventing and controlling rockburst by staged fracturing of an L-shaped horizontal well on the ground, which solves the problem of rockburst at the coal mining face caused by the sudden drop of the large-area suspended roof on the hard roof of the existing coal mining face question

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