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数值试井是解决复杂地层中多相流试井问题的有效手段。本文考虑复杂地层天然气开发过程中井筒气水两相流动和地层气水两相渗流等对试井分析的影响 ,建立了气水两相地层 /井筒两相组合数学模型。在对井筒微分方程进行离散时 ,采用交错网格离散井筒气水两相流动的动量守恒方程 ,解决了常规网格导致的不合理压力场问题 ,为模型的求解奠定了良好的基础。实例计算结果表明 ,交错网格的应用是成功的。
Numerical well test is an effective method to solve the multiphase flow well test in complicated formation. In this paper, the influence of wellbore gas-water two-phase flow and formation gas-water two-phase seepage on the well test analysis is considered in the process of natural gas development in complex formations. A mathematical model of gas-water two-phase formation / wellbore two-phase combination is established. When the differential equation of wellbore is discretized, the momentum conservation equation of gas-water two-phase flow in staggered grid is used to solve the problem of unreasonable pressure field caused by conventional grid, which lays a good foundation for solving the model. The calculation example shows that the application of staggered grid is successful.