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低渗透含水气藏开发过程中,水平井底见水不仅增加了地层流体渗流的复杂性,而且降低了水平井产量。以气水两相渗流理论为基础,建立了气水两相运动方程,定义气水两相启动压力梯度以及气水两相广义拟压力,考虑应力敏感、滑脱效应、紊流效应和表皮效应对气水同产水平井产能的影响,利用保角变换方法推导出低渗透气藏中水平井气水两相三项式产能新公式。通过实例计算,利用新公式计算的无阻流量结果与实际产能测试结果相对误差较小,仅为5.13%,说明新公式精确可靠,且敏感性分析表明,水平气井产水量随着滑脱因子以及水气质量比的增大而增大,而随着启动压力梯度以及应力敏感指数的增大而减小,但启动压力梯度对产水量影响较小,若生产压差较大,启动压力梯度可以忽略不计。!
During the development of low-permeability water-bearing gas reservoirs, horizontal well bottom water not only increases the complexity of formation fluid seepage but also reduces horizontal well production. Based on the theory of gas-water two-phase seepage, the gas-water two-phase equation of motion was established, and the pressure gradient of gas-water two phase and the general quasi-pressure of gas-water two phase were defined. Considering stress sensitivity, slippage effect, turbulence effect and epidermal effect Gas and water production horizontal well productivity, the conformal transformation method is used to derive a new formula for gas-water tri-phase productivity of horizontal well in low-permeability gas reservoirs. Through the example calculation, the relative error between the unobulated flow rate calculated by the new formula and the actual capacity test result is small, only 5.13%, which shows that the new formula is accurate and reliable. And the sensitivity analysis shows that the water yield of horizontal gas well increases with the slip factor and water vapor Mass ratio increases, but decreases with the start-up pressure gradient and stress sensitivity index, but the start-up pressure gradient has little effect on water production. If the production pressure difference is large, the start-up pressure gradient can be neglected . !