Laboratory simulation method for borehole gas drainage and test method for sealing performance of hole sealing materials

Abstract

The invention discloses a method for simulating a borehole gas drainage laboratory, which comprises the following steps: 1. preparation in the early stage of the experiment; 2. prefabricating a plug simulation structure and forming a grouting space; 3. injecting grout into the borehole simulation pipe to simulate sealing hole, and the acoustic emission signal data used to study the crack plugging situation is collected by the acoustic emission system; four, test the negative pressure pumping ability; five, detect the influence of gas leakage at different positions of the drilling simulation pipe on the gas concentration of the drainage; the present invention Also disclosed is a method for testing the airtightness of the sealing material, including the steps: 1. Preparation in the early stage of the experiment; 2. Prefabricating the plug simulation structure and forming a grouting space; 3. Injecting the sealing material into the drilling simulation pipe and observing the cracks Blockage; 4. Test the negative pressure capacity. The invention can truly simulate on-site conditions, requires less manpower and material resources for experiments, has good experiment effects, high accuracy of experiment results, and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of borehole gas drainage, and in particular relates to a laboratory simulation method for borehole gas drainage and a method for testing the airtightness of sealing materials. Background technique [0002] In most areas of my country, coal seams have high gas content, high pressure, low coal seam permeability, and complex geological structure conditions. The gas disaster is one of the main disasters in my country's coal mines, which poses a serious threat to the safe production of the mine, and the sealing effect of the borehole directly affects the gas drainage effect and the effective drainage radius of the borehole. More than 80% of the air in the system is inhaled through boreholes. If the inhaled air volume of the boreholes is reduced by 1 / 2 to 1 / 3, the gas flow rate in the boreholes can be increased by 1.5 to 2 times. Therefore, the sealing effect directly affects the gas extraction effect. During the...

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Problems solved by technology

At present, most of these tests are carried out on site, and there are relatively few laboratories that can carry out such tests, and the underground is limited by some conditions and various factors, the test results are not satisfactory, and the manpower and material resources are also high

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