Gas and water production profiles of coalbed methane wells are important technical data for the development and production management of coalbed methane, and as China's coalbed methane has entered the stage of large-scale development, there is an urgent need for the development of supporting testing technology.
The gas and water production profile test of coalbed methane wells is a new testing field. The test methods, test instruments and test processes used in oilfield gas well testing are not suitable for the test requirements of coalbed methane wells in terms of instrument size, measurement range, and test process. Therefore, they cannot be directly applied to the gas and water production profile test of coalbed methane wells. During the 15th Five-Year Plan period, Daqing Oilfield Testing Branch conducted a series of sensor technology experiments and research on the gas and water production profile of coalbed methane wells. At present, quantitative measurement of gas production profiles below the liquid level in coalbed methane wells has been realized in China. However, the measurement technology of gas production profiles above the liquid level and in pure gas conditions is still a blank, and it is urgent to develop a new measurement technology to realize the test of the entire gas production profile.
Thermal mass flowmeter is a flowmeter that uses the principle of heat diffusion to measure flow through the heat exchange relationship between fluid flow and heat source heat. It has the characteristics of small pressure loss, no moving parts, simple structure, easy maintenance, and large measurement range. It is particularly suitable for measuring small flow of gas fluid. When the thermal mass flowmeter is used in coalbed methane downhole testing, according to the change of downhole ambient temperature, the speed sensor changes with the ambient temperature chart is obtained, which provides an experimental basis for future temperature compensation to reduce the influence of ambient temperature on the speed sensor and more accurately judge the mass flow of the fluid.
When the velocity sensor of the thermal mass flowmeter is at an angle of 0° to the gas flow direction, the sensor response is smaller than that at an angle of 90°, but the velocity sensor response is also very obvious and has good repeatability, indicating that it is feasible to control the velocity sensor to be at an angle of 0° to the gas flow direction in the coalbed methane downhole test, which can effectively reduce the radial size of the instrument. Based on the above conclusions, the test method of applying the thermal mass flowmeter to the gas production profile of coalbed methane wells is feasible.
The above is the "Application of Thermal Mass Flow Meters in Coalbed Methane Wells" shared by thermal mass flow meter manufacturers. Thank you for watching. If you have any questions, you can consult online or leave us a message. We will answer you wholeheartedly.
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