Why should the liquid level be measured in coalbed methane drainage?

Coalbed methane is a kind of adsorbed gas, which can only be produced by drainage and depressurization, and high-yield gas can only be produced by large-area depressurization surface, and the daily water production must be controlled before large-area depressurization occurs, so it is necessary to measure the annular liquid level frequently to accurately control the bottom hole pressure. Since the output is controlled, it is of course related to the drainage and gas production system. When the liquid level is high, the bottom hole pressure will be high, which will reduce production. For the produced gas wells, it is necessary to adjust the gas production to achieve the purpose of uniform diffusion of pressure drop surface. Too low liquid level will lead to premature gas, which will affect the final gas production and increase the production cost.