Method for intensifying coal seam water injection through pressing dynamic-electrodynamic coupling effect

A coal seam water injection and action technology, applied in the direction of mining fluid, wellbore/well components, earthwork drilling and mining, etc., can solve problems such as insufficient coal wetting

Active Publication Date: 2018-05-18
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect of insufficient wetting of the coal body after water injection into the coal seam in the prior art, and combined with the electrodynamic characteristics of coal rock, through the joint action of dynamic pressure and electric field applied to the coal seam, the water can be adjusted u

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  • Method for intensifying coal seam water injection through pressing dynamic-electrodynamic coupling effect
  • Method for intensifying coal seam water injection through pressing dynamic-electrodynamic coupling effect
  • Method for intensifying coal seam water injection through pressing dynamic-electrodynamic coupling effect

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Example Embodiment

[0024] Embodiment 1

[0025] Implement a method of strengthening coal seam water injection through the coupling of pressure dynamics and electrokinetic action. The method is carried out in the following steps:

[0026] Step 1. The working face length of a mine 1 is 150m, the thickness of the coal seam is 3.2m, the coal type is anthracite, and the coal seam of a mine 1 is drilled to determine the uniaxial compressive strength of 7.36MPa and the porosity of 3.82%. , Moisture content 1.18%, Water permeability coefficient 3.515×10 -4 cm 2 ·Atm -1 ·S -1 , Determine the maximum water injection pressure of 15MPa.

[0027] Step 2. The electric permeability coefficient of the coal sample is determined to be 8.578×10 by using the coal and rock electric-pressure dynamic triaxial seepage test device -4 cm 2 ·V -1 ·S -1 , Using a micro electrophoresis instrument to test the electrokinetic potential of anthracite samples in different pH aqueous solutions, see attached image 3 , Considering that t...

Example Embodiment

[0032] Embodiment 2

[0033] Step 1. The length of the working face of a second mine is 200m, the thickness of the coal seam is 2.8m, and the coal type is coking coal; the coal seam of a second mine is drilled and the uniaxial compressive strength of the coal sample is 5.92MPa and the porosity is 2.35%. , Moisture content 1.64%, Water permeability coefficient 1.906×10 -4 cm 2 ·Atm -1 ·S -1 , Determine the maximum injection pressure of 16MPa.

[0034] Step 2: The electric permeability coefficient of the coal sample is determined by the coal and rock electric-pressure dynamic triaxial seepage test device to be 11.493×10 -4 cm 2 ·V -1 ·S -1 , Using a microelectrophoresis instrument to test the electrokinetic potential of coal samples in aqueous solutions with different pH values, see attached Figure 4 , Considering that the acid-base of the coal sample is too high to cause equipment corrosion, it is determined that the pH of the injection solution is 8.5 and the electrode material is...

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Abstract

The invention discloses a method for intensifying coal seam water injection through the pressing dynamic-electrodynamic coupling effect. A row of drilling holes are drilled in the positions, perpendicular to the coal wall, in an air inlet/return roadway, and a high-pressure water injection pipe and an electrode bar are arranged in each drilling hole; the water injection pipes in all the drilling holes are connected together through a high-pressure rubber hose; anode electrodes and cathode electrodes in the drilling holes are connected in series through insulated wires correspondingly; a directcurrent power supply is connected while water is injected into the drilling hole through the dynamic pressure; and coal seam water injection is intensified through the pressing dynamic-electrodynamiccoupling effect. According to the method, through the water injection pressure, electric osmosis acting force and capillary acting force, water is quickly driven from large cracks to micro hole cracks, efficient full wetting of coal bodies is achieved, after a coal reservoir is acted, the single hole wetting range is expanded, the water injection speed rate and the water content are increased, meanwhile, the drilling engineering quantity is further reduced greatly, economical, practical, simple, convenient and reliable effects are achieved, the effect is remarkable, and high application and popularization value is achieved.

Description

technical field [0001] The invention relates to a method for intensifying coal seam water injection, in particular to a method for intensifying coal seam water injection and fully wetting the coal body under the joint action of external dynamic pressure and electric field. Background technique [0002] With the increase of coal mining depth and the improvement of mechanized mining in our country, the output of coal dust at the working face has increased significantly, seriously affecting the physical and mental health of workers. Water injection through the coal seam can effectively reduce the amount of dust produced, and at the same time play a role in preventing rock impact, coal and gas outburst, and coal seam spontaneous combustion. However, the permeability of most coal reservoirs in my country is poor, and water injection is difficult. [0003] The existing method of strengthening coal seam water injection mainly starts from the following three aspects: one is to incr...

Claims

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Application Information

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IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 郭俊庆康天合康健婷张惠轩张晓雨
Owner TAIYUAN UNIV OF TECH
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