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Preparation method of heterogeneous coal core in soft coal seam

A soft coal seam, heterogeneous technology, applied in the field of soft coal seam heterogeneous coal core preparation, to achieve the effect of simple operation and remarkable effect

Active Publication Date: 2020-09-01
四川省科建煤炭产业技术研究院有限公司 +1
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Problems solved by technology

However, 3D printing technology is rarely used to reconstruct soft coal seam cores with complex fracture networks.

Method used

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  • Preparation method of heterogeneous coal core in soft coal seam

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Effect test

Embodiment 1

[0036] see figure 1 , the present embodiment provides a method for preparing a soft coal seam heterogeneous coal core, comprising the following steps:

[0037] 1) Measure the in-situ stress, gas pressure and permeability coefficient of the target soft coal seam.

[0038] 2) Using the elastic wave CT data acquisition system to obtain the spatial fracture distribution pattern of the soft coal seam in the prefabricated coal core area, and establish a three-dimensional visual model of the fracture network. Among them, the spatial fracture distribution form includes the fracture occurrence, trace length and spacing parameters.

[0039] 3) The compressive strength, elastic modulus and Poisson's ratio of the soft coal seam in the prefabricated coal core area are obtained by using the in-situ test system of coal and rock mass elastic parameters and physical parameters.

[0040] 4) Construct the optimal scheme database of prefabricated coal core under different fracture parameters. ...

Embodiment 2

[0045] The main steps of this embodiment are the same as in Embodiment 1, wherein the method for constructing the optimal scheme database of prefabricated coal cores under different fracture parameters in step 4 includes the following steps:

[0046] a) Set the fracture geometry parameters such as bedding line density, single bedding dip angle, single bedding width, cleat line density, single cleat dip angle and single cleat width of the pre-prepared coal core to construct the fracture network.

[0047] b) Set the compressive strength, elastic modulus, Poisson's ratio and permeability coefficient to determine the ground stress and gas pressure values.

[0048]c) Determine the original influencing factor set of the uniaxial compressive strength and permeability coefficient of the pre-prepared coal core, apply the gray Taguchi method, design the original influencing factor screening test plan, and prepare the coal core under different original influencing factors by means of 3D p...

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Abstract

The invention provides a preparation method of heterogeneous coal core in soft coal seam. The method includes the steps that the ground stress, the gas pressure and the permeability coefficient of target soft coal seam is measured, a crack network three-dimensional visual model is established, the compressive strength, the elasticity modulus, and the Poisson's ratio of the soft coal seam in a precast coal core area is obtained, a preparation scheme suitable for the coal core of target soft coal seam is obtained and printed and the coal core is prepared. According to the method, the preparationof the heterogeneous coal core in the soft coal seam is achieved, an effective way is provided for the exploration of the mechanics of the soft coal seam and the permeability, and reliable materialsare provided for the study on the soft coal seam gas dynamic disaster mechanism and in preventing and controlling mechanism aspects thereof.

Description

technical field [0001] The invention relates to the technical field of related research on fluid-solid coupling of soft coal seams, in particular to a method for preparing heterogeneous coal cores of soft coal seams. Background technique [0002] Most of the coal seams in my country were formed from the Carboniferous to the Permian. During this period, they experienced strong tectonic movements, and their original structures were destroyed. As a result, most of the coal seams in my country are soft in texture and complex in structure, making it difficult to obtain raw coal samples. Therefore, many scholars use briquettes reconstructed from similar materials instead of raw coal for experiments. Due to the low strength and high permeability of directly compressed reconstituted coal, the properties are significantly different from those of raw coal. Therefore, people often use additives to reduce the gap between raw coal and reconstituted coal. Relevant scholars added cement t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C64/10B29C64/386B33Y10/00B33Y50/00G01N1/28G01N3/08G01N15/08
CPCB29C64/10B29C64/386B33Y10/00B33Y50/00G01N1/28G01N15/088G01N3/08G01N2203/0003G01N2203/0019G01N2203/0075
Inventor 成艳英邹全乐范凯张碧川蒋志刚张天诚刘涵苏二磊王智民吴斐
Owner 四川省科建煤炭产业技术研究院有限公司
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