气藏水平井产能预测方法

近年来，随“西气东输”工程的启动，越来越多的水平井在气藏开发中得以应用，但国内外对气藏中水平井产能预测方法研究较少。由于气藏中气体的流动方程和油藏中液体的流动方程具有很大的差异，所以油藏中的水平井产能计算公式不能直接应用于气藏。但如果气体流动渗流方程采用拟压力，液体流动渗流方程采用压力，二者的流动方程形式具有相似性，均为线性方程。为满足气藏水平井产能计算的需要，文章对油藏水平井产能解析式进行了改进，提出了适用于气藏的水平井产能计算公式。利用改进后的产能计算公式对新疆塔里木盆地某气藏水平井产能进行了计算，结果表明改进的水平井产能计算公式是可行的。

DELIVERABILITY PREDICTION OF HORIZONTAL GAS WELL

Along with the West-East Pipeline being brought into operation, more and more horizontal wells are deployed in the development of the gas reservoirs in recent years. However, studies of deliverability prediction methods of horizontal wells are not common. As the gas flow equations of gas reservoirs are quite different with the liquid flow equations of oil reservoirs, the formula for calculating the deliverability of horizontal oil wells cannot be directly used for horizontal gas wells. If pseudopressure is used in the gas flow equation, while pressure is used in liquid flow equation, the forms of the two flow equations are similar, i.e. both of them are linear equations. In order to meet the requirements of deliverability calculation, formula for calculating deliverability of horizontal gas wells are established through improving the analytical formula for calculating deliverability of horizontal oil wells. The improved deliverability formula is used to calculate the deliverability of a real horizontal gas well in Tarim basin, Xinjiang. The calculation results show that the new formula is feasible.