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Equivalent quantitative assessment method for gas drainage compliance based on liquid CO2 cracking permeability increasement and phase change displacement

A technology for gas extraction and quantitative assessment, applied in the field of effective quantitative assessment, which can solve problems such as lack of methods and specifications

Active Publication Date: 2020-07-10
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, under conventional extraction conditions, high gas, coal and gas outburst mines are implementing the "Regulations on the Prevention and Control of Coal and Gas Outbursts" and the "Interim Regulations on Drainage of Coal Mine Gas Drainage Standards", while for liquid CO2 There is a lack of corresponding methods and specifications for the equivalent quantitative evaluation of the drainage effect in the cracked and displaced coal seam gas test area.

Method used

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  • Equivalent quantitative assessment method for gas drainage compliance based on liquid CO2 cracking permeability increasement and phase change displacement
  • Equivalent quantitative assessment method for gas drainage compliance based on liquid CO2 cracking permeability increasement and phase change displacement
  • Equivalent quantitative assessment method for gas drainage compliance based on liquid CO2 cracking permeability increasement and phase change displacement

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 , figure 2 , image 3 As shown, an equivalent quantitative evaluation method based on liquid CO2 fracturing enhancement and phase change flooding gas drainage up to standard, including the following steps:

[0044] The first step is to investigate the average content of CH4 and CO2 in the coal seam in the test area, which are recorded as WCH4 and WCO2 respectively;

[0045]In the second step, during the drilling construction process, coal samples from pressure injection holes and extraction holes are collected, adsorption and desorption experiments and industrial analysis are carried out in the laboratory, and adsorption constant a, b values, coal ash content Ad and coal moisture Mad are obtained. Determine the amount of non-desorbable gas Wb according to the "Provisional Provisions for Gas Drainage in Coal Mine to Reach Standards";

[0046] In actual use, the formula In the formula, Wb is the non-desorbable gas amount of coal under standard atmos...

Embodiment 2

[0048] On the basis of embodiment 1,

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication also changes accordingly.

[0050] In addition, the descriptions involving "first", "second" and so on in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

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Abstract

The invention provides an equivalent quantitative evaluation method for gas drainage compliance based on liquid CO2 cracking permeability increasement and phase change displacement. The equivalent quantitative evaluation method quantitatively characterizes the equivalent compliance radius, displacement ratio and gas displacement efficiency of engineering tests in conjunction with the Interim Provisions for Coal Seam Drainage Standards; In addition, the evaluation method organically combines the liquid CO2 injection volume with the equivalent compliance radius, displacement ratio and gas displacement efficiency to achieve a quantitative evaluation after liquid CO2 is injected (the amount of injection, the value of the equivalent radius, the value of the displacement ratio and the value ofthe gas equivalent efficiency), a basis is provided for the liquid CO2 injection volume of the engineering test and the design of drainage drilling hole spacing, gas drainage can be improved, and minegas disasters are reduced.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage, in particular to a liquid CO based 2 Equivalent quantitative evaluation method for fracturing anti-permeability and phase change flooding gas drainage. Background technique [0002] More than 50% of the coal seams in my country are high-gas coal seams, and 70% of the mines are high-gas mines. Coal mine gas disasters seriously threaten the safe and efficient production of mines. From 2015 to 2017, there were 112 gas accidents in coal mines nationwide, and 524 people died. Gas also has great harm to the atmospheric environment. Its damage to the ozone layer and the greenhouse effect are respectively CO 2 7 times and 21 times. In addition, gas is a clean, efficient and efficient energy source. However, my country's coal seam has low permeability, high gas pressure, and large gas content, and it is difficult to extract gas from the original coal seam. Scholars at home and abroad ha...

Claims

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Application Information

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IPC IPC(8): E21B47/00G01N15/08G06F17/10E21B43/26E21B43/16
CPCE21B47/00G01N15/08G06F17/10E21B43/006E21B43/26E21B43/255E21B43/164G01N2015/0866Y02P90/70
Inventor 文虎程小蛟樊世星郭慧敏金永飞费金彪于志金郭军张铎
Owner XIAN UNIV OF SCI & TECH