COMPLEX RESISTANCE MEASUREMENT SYSTEM AND METHOD FOR NITROGEN DISPLACEMENT OF COAL BED GAS

Complex resistance measurement system and method for nitrogen displacement of coal bed gas, which comprises gas tank, nitrogen tank, pressure gauge, valve, pressure regulating valve, flow meter, vacuum pump, holder, confining pressure pump, axial pressure pump, resistance measuring instrument, computer, gas chromatograph, mixed gas collection box and constant temperature water bath box; the confining pressure pump is connected to the confining pressure interface, and the axial pressure pump is connected to the axial pressure interface; the gas tank and the nitrogen tank are respectively connected to the gas inlet of the holder through the ventilation pipe. The mixed gas collection box is connected to the gas outlet of the holder through a pipe, the gas chromatograph is provided on the pipe, which is connected to the computer in communication; the complex resistance measuring instrument is connected to the left and right electrode plates of the holder, which is connected to the computer in communication; the system and method of the present invention test the change in the complex resistance during the process of nitrogen displacement of gas in the coal, which provides the application of the complex resistance method in coal bed logging technology with strong experimental support. 0-1/2 eo@ Fiur0