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Test method for improving coal rock permeability and device thereof

A test method and a technique of permeability, which are applied in the field of test methods and devices for improving coal-rock permeability, can solve problems such as low coal-rock permeability, and achieve the effects of high measurement accuracy, reliable performance, and simple structure

Inactive Publication Date: 2012-08-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of low permeability of coal and rock, and the purpose is to provide a test method and device for improving the permeability of coal and rock

Method used

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  • Test method for improving coal rock permeability and device thereof
  • Test method for improving coal rock permeability and device thereof
  • Test method for improving coal rock permeability and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] Implement a kind of test method of improving coal rock permeability of the present invention, take anthracite as example, concrete test process is as follows:

[0031] (1) Processing samples. According to the required sample, the block anthracite coal was retrieved from the site, placed on the drilling machine, sampled, and both ends were smoothed, and the sample size was processed to Φ50×100.

[0032] (2) Install the test device, place the sample on the support rod 4 with the cathode electrode plate 7 attached, place the anode electrode plate 7 and the pressurized piston rod 8 in sequence, that is, the upper end of the sample is the anode, the lower end is the cathode, and the electroosmotic When functioning, its conductivity can be improved along the flow direction of the solution. The anode material is made of red copper, and the cathode material is made of 316L stainless steel. Use a 30mm-long polytetrafluoroethylene heat shrinkable sleeve 6 to firmly heat-seal the...

Embodiment approach 2

[0038] Taking water as an example, see Figure 4 , the permeability of the sample after electroosmosis is 1.4~2.08 times that before the action. The seepage medium is 0.05mol·l -1 In NaCl solution, the permeability of anthracite increased by 42%~110% after electroosmosis, and the seepage medium was 0.05mol·l -1 CaCl 2 solution, the anthracite permeability increased by 56% to 120% after electroosmosis. It can be seen that the solution is AlCl 3 , the effect is most significant; in addition, for different concentrations of AlCl 3 The solution was tested, followed by 0.01 mol l -1 , 0.025 mol l -1 , 0.05 mol l -1 , 0.1 mol l -1 , 0.2 mol l -1 , 0.4 mol l -1 , the results show that the concentration is 0.05mol·l -1 , the effect is most pronounced.

[0039] Attached below figure 1 And attached figure 2 The specific embodiment of the device of the present invention is described further:

[0040] Such as figure 1 , implement a kind of test device that improves the pe...

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Abstract

A test method for improving coal rock permeability and a device thereof particularly relate to a test method and a device thereof which can improve coal rock permeability by changing the pore structure and mechanical properties of coal rocks through an electroosmosis action. The method includes that a positive electrode and a negative electrode are arranged at two ends of a coal rock sample to perform the electroosmosis action, the coal rock permeability is measured before and after the electroosmosis action and during the process of the electroosmosis action, a mechanism of the electroosmosis action on intensifying the coal rock permeability is researched, intensifying parameters are optimized, and a scientific theoretical basis is provided for an engineering application of improving the coal rock permeability by means of the electroosmosis. The device comprises a three-spindle seepage test room, a plunger pump, a water injection pump, a water tank and a direct-current power supply. The device is simple in structure, reliable in performance and accurate in measurement. The method is remarkable in effect, after the electroosmosis action, the permeability of the coal rock sample can be improved by 65% to 128%.

Description

technical field [0001] The invention relates to a test method and a device for increasing the permeability of coal and rock, in particular to a test method and a device for increasing the permeability of coal and rock through electroosmosis. Background technique [0002] The development and utilization of unconventional natural gas (such as coalbed methane and shale gas) is one of the main contents of my country's Twelfth Five-Year Plan. Yield advantage. However, there are many difficulties in the process of realizing commercial mining. The main reason is that my country's geological conditions are complex, and the permeability of coal rocks is low, which is 2 to 3 orders of magnitude lower than that of the United States. The permeability just reflects the fluid migration in coal rocks. Difficulty is an indicator of difficulty, and at the same time, it is also an important parameter for formation damage assessment and natural gas production design. Therefore, it is urgent to...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 康天合郭俊庆柴肇云沈玉旭康官先
Owner TAIYUAN UNIV OF TECH
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