Safety guarantee method for controlling fracturing in underground coal mine

Abstract

The invention discloses a safety guarantee method for controlling fracturing in an underground coal mine. The method includes a first step of identifying safety influence factors, a second step of constructing a surrounding rock parameter database, a third step of calculating a minimum safety boundary distance, a fourth step of performing special design of a fracturing scheme, a fifth step of performing fracturing construction safety control, and a sixth step of performing post-fracturing acceptance check evaluation and improvement. The step of identifying the safety influence factors includesthe process of identifying subjective and objective influence factors; and the step of calculating the minimum safety boundary distance includes the process of calculating the safety distance of a weakest point in a fracturing area with mathematical models in combination with the safety influence factors and the surrounding rock parameter database, wherein the mathematical models include a drilling control hydraulic fracturing hole sealing mechanical model and a minimum safety boundary mechanical model. The method has the advantages that by scientifically and reasonably establishing an all-round underground coal mine hydraulic fracturing safety guarantee system, the safe implementation of fracturing work is ensured, and the whole fracturing safety management work runs through the whole process before, during and after the event.

Description

technical field [0001] The invention belongs to the field of coalbed methane development, in particular to a safety guarantee method for controlled fracturing in coal mines. Background technique [0002] In terms of permeability enhancement of low-permeability coal seams in coal mines, hydraulic fracturing, hydraulic punching, hydraulic slits, etc. are currently widely used to increase permeability. The technical and economic advantages are the most significant. In areas with serious gas disasters, a coal seam permeability enhancement mode of "hydraulic fracturing as a regional measure and hydraulic slits as a local measure" has been formed. Thousands of hydraulic fracturing have been carried out so far, and obvious results have been achieved. However, gas over-limit accidents caused by the collapse of underground fracturing tunnels in coal mines still occur from time to time, which shows that hydraulic fracturing technology is still not intrinsically safe. Therefore, it i...

AI Technical Summary

Problems solved by technology

However, from time to time, coal mine underground fracturing roadway collapse caused gas over-limit accidents, indicating that hydraulic fracturing technology is still not intrinsically safe

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