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Evaluation method forfracturing and anti-reflection effect of low-permeability coal and rock mass under microscopic scale

An evaluation method and low-permeability technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, instruments, and use wave/particle radiation for material analysis, etc., and can solve problems such as unquantitative evaluation effects

Active Publication Date: 2021-09-14
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

However, the evaluation methods of the above cracking and anti-reflection effects are all qualitative or semi-qualitative, and no quantitative evaluation effect has been obtained.

Method used

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  • Evaluation method forfracturing and anti-reflection effect of low-permeability coal and rock mass under microscopic scale
  • Evaluation method forfracturing and anti-reflection effect of low-permeability coal and rock mass under microscopic scale
  • Evaluation method forfracturing and anti-reflection effect of low-permeability coal and rock mass under microscopic scale

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Embodiment 1

[0090] A method for evaluating the effect of fracturing and enhancing permeability of low-permeability coal and rock mass at the mesoscopic scale, comprising the following steps:

[0091] (1) Use crack propagation gauge (CPG) to monitor and judge the dynamic whole process of crack initiation, propagation and crack arrest at the crack tip of coal and rock mass under load;

[0092] ① Before the loading test, a circular through hole with a diameter of 25-35 mm is drilled at the center of one side of the coal-rock mass specimen, and a crack with a length of 8 mm-12 mm along the diameter of the hole is prefabricated. The size of the prefabricated crack is The success of the experiment plays a key role. If the length of the prefabricated crack is too short, the phenomenon of crack bifurcation and propagation will easily occur in the experiment; if the length is too long, the crack initiation time will be delayed; Close to the prefabricated crack tip, parallel to the crack propagatio...

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Abstract

The invention provides an evaluation method for fracturing and anti-reflection effects of a low-permeability coal and rock mass under a microscopic scale. A set of system for visually, accurately and quantitatively evaluating the fracturing and anti-reflection effects of a coal and rock mass under a micro-scale is established by combining a crack propagation gauge (CPG) and an ultrasonic detection system with CT scanning and image processing software, pore characteristic analysis system software (PCAS) and space three-dimensional reconstruction software. According to the evaluation method disclosed by the invention, comprehensive, overall and visual three-dimensional observation can be performed on internal fractures of a fractured coal and rock mass from different angles, the shape, size, position and distribution of the internal fractures of the coal and rock mass are deeply analyzed, so that the internal fractures are transparent, the spatial distribution form and quantitative characteristics of the internal fractures of the fractured coal and rock mass are further analyzed, and the problems of coal seam fracturing technology optimization and construction parameter optimization are further solved.

Description

technical field [0001] The invention relates to a method for evaluating the effect of fracturing and enhancing permeability of low-permeability coal and rock mass at the mesoscopic scale, and belongs to the technical field of evaluating the effect of fracturing and increasing permeability of coal and rock mass. Background technique [0002] China is rich in coalbed methane resources, ranking third in the world, but the extraction rate of coalbed methane in my country is very low. Among them, low permeability is the primary technical problem restricting the exploitation of coalbed methane in my country. Artificial fracturing methods are used, such as: hydraulic fracturing, hydraulic cutting, hydraulic jet fracturing technology, pulsating hydraulic fracturing technology, high-voltage electric pulse The hydraulic fracturing technology is used to transform the structure of coal and rock mass, so that a large number of complex fracture networks are formed in the coal and rock mass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/046G01N27/04G01N29/07G06T17/00G06Q10/06G06Q50/02
CPCG01N23/046G01N27/041G01N29/07G06T17/00G06Q10/0639G06Q50/02
Inventor 鲍先凯宋翔宇刘源赵刚郭军宇赵双时睦涵
Owner INNER MONGOLIA UNIV OF SCI & TECH
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