Safety guarantee method for controlling fracturing in underground coal mine

A safety guarantee, coal mine technology, applied in earth-moving drilling, wellbore/well components, mining fluids, etc., can solve the problems of hydraulic fracturing technology not being intrinsically safe, gas over-limit accident, etc., to achieve reliable safety guarantee, technical means full effect

Active Publication Date: 2020-08-25
重庆市能源投资集团科技有限责任公司 +1
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Problems solved by technology

However, from time to time, coal mine underground fracturing roadway collapse caused gas ove...

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  • Safety guarantee method for controlling fracturing in underground coal mine
  • Safety guarantee method for controlling fracturing in underground coal mine
  • Safety guarantee method for controlling fracturing in underground coal mine

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Embodiment Construction

[0091] Below in conjunction with accompanying drawing the present invention will be further described, but therefore the present invention is not limited among the scope of described embodiment.

[0092]A safety guarantee method for controlled fracturing in a coal mine, comprising the following steps:

[0093] The first step is the identification of safety-influencing factors: including the determination of weak points in the fracturing area, the type, location, scale, and distance of the free surface;

[0094] The second step is the construction of the surrounding rock parameter database: including collecting coal seam, roof and floor samples in the fracturing area, laboratory tests and on-site measurements to obtain the in-situ stress, pressure coefficient, uniaxial compressive strength, and Poisson's ratio in the fracturing area and other surrounding rock foundation parameters;

[0095] The third step is the calculation of the minimum safe boundary distance: including calc...

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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...

Claims

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Application Information

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IPC IPC(8): E21B43/26G06F30/20G06Q50/02G06F111/10G06F119/14
CPCE21B43/26E21B43/006G06F30/20G06Q50/02G06F2111/10G06F2119/14
Inventor 王凯周东平周俊杰蒋和财刘军范彦阳王选琳张翠兰刘柯刘登峰龚齐森郭臣业张尚斌谢飞沈大富黄昌文王文春李文树陈朝和何华钟传平尹龙
Owner 重庆市能源投资集团科技有限责任公司
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