有水气井产能预测方法

存在边水、底水或层间水的气藏,在生产过程中容易出现气水两相流动。准确预测气水两相流动条件下的气井产能是气田高效开发的关键。基于稳态渗流理论和质量守恒原理,建立了有水气井气、水两相均服从达西渗流的产能方程和气相服从非达西渗流,水相服从达西渗流的产能方程以及气、水两相均服从非达西渗流的产能方程并给出了相应的求解方法。通过实例绘制3种产能方程在不同水气比下的流入动态曲线,分析气水两相的流动规律。

Productivity Prediction Method for Water-bearing Gas Well

During the well produces in gas reservoir, it is easy to appear the gas and water two-phase flow due to the existence of edge water, bottom water or interlayer water.Under the condition of gas and water two-phase flow, how to accurately predict the productivity of gas well is the key to the development of gas field with high efficiency. Based on steady state seepage theory and law of conservation of mass, this paper presented the productivity equa-tions of gas and water obeying Darcy′s law, gas obeying non-Darcy′s law, water obeying Darcy′s law, gas and wa-ter obeying non-Darcy′s law in water-bearing gas well and expounded the method of calculating these productivity e-quations.Through the analysis of actual case, we obtained the inflow performance curves of these productivity e-quations under different ratio of water and gas and analyzed the flow rules of gas and water.