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Accurate gas extraction method based on quantitative optimization of mining-induced fracture field
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A fissure field and fissure technology, which is applied in the field of precise gas extraction, can solve problems such as insufficient accurate gas extraction in fissure zones, and achieve the effect of optimizing drilling arrangement and precise and efficient extraction.
Pending Publication Date: 2022-06-24
CHONGQING UNIV
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However, the positioning calculated by the traditional empirical formula is not enough to achieve accurate gas drainage in the fractured zone, and it is also necessary to ensure that no deviation occurs during the drilling process.
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Embodiment 1
[0071] The present embodiment provides a method for precise gas extraction based on the quantification of the mining fracture field, including the following steps:
[0073] 2) According to the field test results, determine the fracture zone range;
[0074] 3) Quantitatively characterize mining fractures (combining theoretical analysis and similar simulation to obtain mining fracture parameters):
[0075] 3.1) Based on the theory of masonry beams, construct the block fracture model of mining cracks, and calculate the key parameters of the overlying rock cracks in the stope;
[0076] 3.2) Combined with similar simulation tests, binarize the images of overburden collapse and fracture development after mining, and then perform grid processing, and finally count the mining fracture parameters such as opening, angle, area, and frequency;
[0077] 4) Construct a comprehensive evaluation model of mining fracture fractal interpolation, and determi...
Embodiment 2
[0082] The main structure of this embodiment is the same as that of Embodiment 1. Further, in step 5), after the precise positioning of the final hole of the directional long drilling, the construction drilling field is arranged in the groove of the working face, and the directional long drilling is constructed by using a flexible active hole protection method. hole.
Embodiment 3
[0084] The main structure of this embodiment is the same as that of Embodiment 1, wherein step 2) comprehensively determines the fracture zone range according to empirical formulas, similar simulations, numerical simulations and field tests, and specifically includes the following steps:
[0085] 2.1) Calculate the height of fissure zone by empirical formula;
[0086]
[0087] In the formula, H li is the height of the fracture zone, m; ∑M is the thickness of the accumulated coal seam, m;
[0088] 2.2) Obtain the fracture zone height by similar simulation;
[0089] see image 3 , according to the physical and mechanical parameters of the coal stratum on site, based on the similarity theory, and based on the actual geological conditions of the working face, the rotatable similarity simulation test bench is used to study the evolution law of the mining fracture field, obtain the height of the fracture zone, and obtain the mining Fracture distribution characteristics;
[00...
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Abstract
The invention provides an accurate gas extraction method based on quantitative optimization of a mining-induced fracture field. The method comprises the following steps: carrying out field testing; determining a fissure zone range according to a field test result; quantitatively representing the mining-induced fracture; constructing a mining-induced fracture fractal interpolation comprehensive evaluation model, and determining an optimal fracture block space coordinate; and based on fracture field quantification and mining-induced fracture fractal interpolation comprehensive evaluation results, accurate positioning is carried out on the directional long drill hole final hole, and the like. According to the method, on the basis of mining-induced fracture field quantification, mining-induced fracture quantitative characterization optimization is achieved by building a mining-induced fracture fractal interpolation comprehensive evaluation model, then the position of a fractured zone gas extraction drill hole end hole is accurately positioned, and finally a directional long drill hole is constructed in combination with a flexible active hole protection mode; and continuous and efficient fissure zone pressure relief gas extraction is achieved and guaranteed.
Description
technical field [0001] The invention relates to the field of mining engineering, in particular to a method for precise gas extraction based on quantification and optimization of mining fissure fields. Background technique [0002] my country is a country with large coal resources, as well as a large country in coal production and consumption. Coal will still be the "ballast stone" of my country's energy in the future, and the safe production of coal mines is restricted by many disasters such as gas. Gas drainage with long boreholes in fissure zone is one of the main technical means to control gas exceeding limit in coal mines. In the process of coal seam mining, the overlying rock collapses, moves and produces a large number of cracks, resulting in the continuous desorption of the decompressed gas from the adsorbed state to the free state. Therefore, it is of great significance to study the distribution and fine quantification of mining fractures for realizing the precise l...
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