凝析气藏水平井产能计算新方法及影响因素分析

当前对于凝析气藏渗流和产能的研究是以直井研究较多,甚少有研究凝析气藏水平井产能。考虑压力变化对流体物性影响,对凝析气藏的产能进行研究评价。从常规的产能分析出发,考虑岩石应力敏感系数、气体高速非达西渗流因素,定义了气油两相拟压力,采用复变函数理论保角变换,推导凝析气藏气油两相渗流产能方程。实例计算表明,新公式与产能测试的误差仅为7.2%,准确程度高。产能影响因素分析表明,凝析气藏高速非达西渗流效应对产能影响较小,岩石应力敏感系数、油气体积比和滑脱因子对产能影响较大。随着岩石应力敏感系数和油气比的增大,气井无阻流量逐渐降低,而随着滑脱因子的增大,无阻流量不断增大。

A New Method for Calculating Productivity of Horizontal Wells in Condensate Gas Reservoirs and Analysis of Influencing Factors

At present, the study of seepage and productivity in condensate gas reservoirs is based on vertical wells, and few studies on horizontal well productivity in condensate gas reservoirs. In this paper, the influence of pressure change on the physical properties of fluid is considered, and the production capacity of condensate gas reservoir is studied and evaluated. From the conventional productivity analysis, considering the rock stress sensitivity coefficient and gas high-speed non-Darcy percolation factor, the gas-oil two-phase pseudo-pressure is defined, and the gas-oil two-phase seepage production capacity is deduced by the complex function theory. equation. The calculation results show that the error between the new formula and productivity test is only 7.2%, and the accuracy is high. The influence factors of production capacity are as follows: the high-speed non-Darcy seepage effect has little effect on productivity, and the rock stress sensitivity coefficient, oil-gas volume ratio and slippage factor have great influence on productivity. With the rock stress sensitivity coefficient, the oil- Increase, the gas wells open flow gradually reduced.