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压力波在气－液两相流中传播速度模型被分析和研究表明：压力波在气液两相流中传播速度远低于在纯液与纯气中传播速度。在一定的井深及泥浆性能等情况下，对于一定的地层进气量，在环空中将出现对应的气液两相流型及对应的气体上升速度。根据压力波在环空中传播时间变化情况，通过求解气液两相流偏微分方程组，可以在地层气体侵入井眼不久即可检测出气侵高度及气体含量。本方法比传统方法发现气侵的时间早得多。
The pressure wave propagation model in gas-liquid two-phase flow is analyzed and studied. The results show that the propagation velocity of pressure wave in gas-liquid two-phase flow is much lower than that in pure liquid and pure gas. In a certain depth and mud performance and other circumstances, for a certain amount of formation intake, in the annulus will appear the corresponding gas-liquid two-phase flow pattern and the corresponding gas rate of rise. According to the propagation time of pressure wave in annulus, the gas-intrusion height and gas content can be detected shortly after the formation gas invades into the wellbore by solving the partial differential equations of gas-liquid two-phase flow. This method is much earlier than the traditional method of gas invasion.