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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of low permeability of coal a

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

Example Embodiment

[0029] Embodiment 1

[0030] To implement the test method for improving the permeability of coal and rock according to the present invention, taking anthracite as an example, the specific test process is as follows:

[0031] (1) Processing samples. According to the required samples, the lump anthracite is retrieved from the site and placed on a drilling machine for sampling. The two ends are polished smoothly. The size of the sample is processed to Φ50×100.

[0032] (2) Install the test device, place the sample on the support rod 4 with the cathode electrode plate 7, and 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 and the lower end is the cathode. When it acts, it can improve its conductivity along the flow direction of the solution. The anode material is copper and the cathode material is 316L stainless steel. Use a 30mm long polytetrafluoroethylene heat-shrinkable sleeve 6 to heat seal the sampl...

Example Embodiment

[0037] Embodiment 2

[0038] Taking water as an example, the relationship between the permeability ratio of anthracite before and after electroosmosis and the change in potential gradient is shown in Figure 4 , The permeability of the sample after electroosmosis is 1.4~2.08 times that before the effect. Seepage medium is 0.05mol·l -1 In NaCl solution, the permeability of anthracite is increased by 42%~110% after electroosmosis, and the seepage medium is 0.05mol·l -1 CaCl 2 In solution, the permeability of anthracite is increased by 56%~120% after electroosmosis. It can be seen that the solution is AlCl 3 The effect is the most significant at the time; in addition, for different concentrations of AlCl 3 The solution was tested, the order is 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 When, the effect is most significant.

[0039] Attached below figure 1 And figure 2 The specif...

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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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