# 气层厚度对井底压力的影响分析Analyzing the Effect of Gas Layer Thickness on Bottom Hole Pressure

Abstract: In the process of drilling of gas wells, the change of bottom hole pressure has great influence on well control. However, the influence of gas layer thickness on the bottom hole pressure was not considered currently in analyzing the factors influencing the changes of bottom hole pressure. Based on mass conservation and principle of conservation of momentum, the mathematical model of bottom pressure after invading was established. And then based on the engineering case, com-bined with the phase separation equations, the finite difference method is used to discuss the in-fluential rules of gas layer thickness on the bottom hole pressure. The result shows that the bottom hole differential pressure and the stable value of B.H.P. increases while the thickness of drilling gas formation is large, which can increase the difficulty of well control. The suggestion is that rational measurement is used for early control of gas invasion to reduce the gas invasion and safe well control. The study is the completion to the understanding of gas invasion and regulation of the changes of bottom hole pressure, it provides guidance for setting up the strategy of well control.

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