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A kind of soft coal seam heterogeneous coal core preparation method
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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: 2022-03-15
四川省科建煤炭产业技术研究院有限公司 +1
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However, 3D printing technology is rarely used to reconstruct soft coal seam cores with complex fracture networks.
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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 method for preparing a soft coal seam heterogeneous coal core. The method includes measuring the ground stress, gas pressure and permeability coefficient of the target soft coal seam, establishing a three-dimensional visual model of the fracture network, obtaining the compressive strength, elastic modulus and Poisson's ratio of the soft coal seam in the prefabricated coal core area, and obtaining the target soft coal seam. The preparation scheme of coal seam core and the steps of printing and preparing coal core. This method realizes the preparation of heterogeneous soft coal seam coal core, provides an effective way for the exploration of soft coal seam mechanics and permeability properties, and also provides reliable raw materials for the study of soft coal seam gas dynamic disaster mechanism and its prevention and control mechanism.
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...
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