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Determination method for reasonable immersion time of coal seam water infusion

A technology of wetting time and coal seam water injection, which is applied in the determination of reasonable infiltration time for coal seam water injection, and the determination of reasonable infiltration time in the practice of coal seam water injection prevention and control of gas projects, can solve problems such as reducing gas release speed, and achieve strong practicability and reliable coal seam. The effect of water injection with reasonable soaking time

Active Publication Date: 2016-10-12
HENAN POLYTECHNIC UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the difficulty of determining a reasonable water injection infiltration time by using capillary force and moisture test methods, it is proposed to determine a reasonable water injection infiltration time from the effect of inhibiting gas desorption after water injection in coal seams. Pores and fissures in the coal are eliminated, thereby reducing the rate of gas emission

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  • Determination method for reasonable immersion time of coal seam water infusion
  • Determination method for reasonable immersion time of coal seam water infusion
  • Determination method for reasonable immersion time of coal seam water infusion

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0054] Embodiment 1: This embodiment takes the coal sample of mine A as the experimental coal sample to elaborate the technical solution of the present invention.

[0055] 1) Experimental method

[0056] Select the coal sample from Mine A as the experimental coal sample. The particle size of the coal sample is 1-3mm. After vacuuming, first fill a certain amount of methane gas to let the coal sample absorb and balance. After that, inject water into the coal sample. The water injection volume is 10% for design. Equilibrate for 3h, 6h, and 9h, and conduct the gas desorption speed test respectively.

[0057] 2) For the test results of gas desorption speed of coal samples in mine A under different infiltration times, see Figure 1 to Figure 4 , figure 1 It is the graph of the gas desorption speed test that the equilibrium time is 3 hours in the present embodiment; figure 2 It is the graph of the gas desorption speed test that the equilibrium time is 6 hours in the present embod...

Embodiment 2

[0059] Embodiment 2: In this embodiment, the technical scheme of the present invention is described in detail by taking the coal sample of mine B as the experimental coal sample.

[0060] 1) Experimental method

[0061] The coal sample of Mine B was selected as the experimental coal sample. The particle size of the coal sample was 1-3mm. After vacuuming, a certain amount of methane gas was first filled to allow the coal sample to absorb and balance. After that, water was injected into the coal sample. Equilibrate for 3h, 6h, and 9h, and conduct the gas desorption speed test respectively.

[0062] 2) For the test results of gas desorption speed under different soaking times, see Figure 5 to Figure 8 , Figure 5 It is the graph of the gas desorption speed test that the equilibrium time is 3 hours in the present embodiment; Figure 6 It is the graph of the gas desorption speed test that the equilibrium time is 6 hours in the present embodiment; Figure 7 It is the graph of t...

Embodiment 3

[0064] Embodiment 3: the present embodiment elaborates the technical scheme of the present invention in detail with the C mine coal sample as the experimental coal sample

[0065] 1) Experimental method

[0066] The coal sample of Mine C was selected as the experimental coal sample. The particle size of the coal sample was 1-3mm. After vacuuming, a certain amount of methane gas was first filled to allow the coal sample to absorb and balance. After that, water was injected into the coal sample. Equilibrate for 3h, 6h, and 9h, and conduct the gas desorption speed test respectively.

[0067] 2) For the test results of gas desorption speed under different soaking times, see Figure 9 to Figure 12 , Figure 9 It is the graph of the gas desorption speed test that the equilibrium time is 3 hours in the present embodiment; Figure 10 It is the graph of the gas desorption speed test that the equilibrium time is 6 hours in the present embodiment; Figure 11 It is the graph of the ga...

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Abstract

The invention discloses a determination method for reasonable immersion time of coal seam water infusion. The method is sequentially carried out according to the following steps: (1) carrying out drying treatment on an experiment coal sample; (2) dividing the coal sample into n parts, wherein n is more than or equal to 3; after weighing, sequentially filling the coal samples into corresponding coal sample tanks; (3) degassing an adsorption tank in vacuum to be lower than 10Pa by utilizing a vacuum degassing unit; (4) inflating certain amount of methane gas into the experiment coal samples by utilizing an inflation tank; (5) injecting same water into the corresponding coal sample tanks; (6) testing a gas desorption speed of the coal samples and setting different balance time for the coal samples; (7) fitting gas desorption speed testing speed according to a Wente equation, so as to obtain a first-minute gas desorption speed V1; drawing a secondary curve of the first-minute gas desorption speed V1 and immersion time after water infusion, wherein the immersion time corresponding to a minimum value of the gas desorption speed on the drawn curve is the reasonable immersion time. With the adoption of the determination method, the reasonable immersion time of the coal seam water infusion can be accurately and reliably determined and the practicability is strong.

Description

technical field [0001] The invention belongs to the field of mine gas disaster prevention and control, and in particular relates to a method for determining a reasonable infiltration time of coal seam water injection, which is mainly suitable for determining a reasonable infiltration time in the practice of coal seam water injection prevention and control of gas engineering. Background technique [0002] Coal seam water injection was first applied in coal mines as a dust prevention measure. As a prevention and control measure for coal and gas outburst, it began to be popularized and applied in coal mines in my country in the 1960s. Production practice has proved that high pressure water is used as a preventive measure for coal seam water injection. The outburst medium can achieve the dual effects of anti-outburst and dust reduction during use. [0003] Pressure water wet coal seam is a typical seepage process from unsaturated to saturated, which is the result of the joint act...

Claims

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Application Information

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IPC IPC(8): G01N33/22
CPCG01N33/222
Inventor 肖知国常红段振伟秦定国王顺双王宪刚孟雷庭
Owner HENAN POLYTECHNIC UNIV
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