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A safety assurance method for controlled fracturing in underground coal mines

A technology for safety assurance and coal mines, applied in earthwork drilling, boreholes/well components, instruments, etc., can solve problems such as gas overrun accidents, hydraulic fracturing technology not intrinsically safe, etc., and achieve the effect of ensuring safe implementation

Active Publication Date: 2022-03-01
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 over-limit accidents, indicating that hydraulic fracturing technology is still not intrinsically safe

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  • A safety assurance method for controlled fracturing in underground coal mines
  • A safety assurance method for controlled fracturing in underground coal mines
  • A safety assurance method for controlled fracturing in underground coal mines

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Embodiment Construction

[0091] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments.

[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 to build 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 calculating the mi...

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Abstract

The invention discloses a safety guarantee method for controlled fracturing in coal mines, which comprises the first step, identification of factors affecting safety; the second step, construction of a surrounding rock parameter database; the third step, calculation of the minimum safety boundary distance; the fourth step, fracturing The special design of the fracturing scheme; the fifth step is the safety management and control of the fracturing construction; the sixth step is the improvement of the post-fracturing acceptance evaluation. Among them, the identification of safety-influencing factors includes the identification of subjective and objective influencing factors; the calculation of the minimum safety boundary distance includes combining safety-influencing factors and surrounding rock parameter databases, and applying mathematical models to calculate the safety distance of the weakest point in the fracturing area; Among them, the mathematical model includes the drilling control hydraulic fracturing mechanical model and the minimum safe boundary mechanical model. The beneficial effect of the present invention is that, by scientifically and rationally establishing an all-round coal mine hydraulic fracturing safety guarantee system, the safe implementation of fracturing work is ensured, and the entire 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 coal bed gas development, and in particular relates to a method for ensuring the safety of coal mine underground controlled fracturing. 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 model with "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, from time to time, coal mine underground fracturing roadway collapses cause gas over-limit accidents, which shows that hydraulic fracturing technology is still not intrinsically safe. Therefore, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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