平面非均质储层水平井产能计算

Deliverability prediction method for horizontal wells for reservoirs with heterogeneity in horizontal direction

为了提高单井产量,增加与储层的接触面积,降低生产压差.根据热量守恒及达西定律,考虑气藏与水平井筒的耦合作用及井筒内的压力损失,建立平面非均质储层水平井产能预测模型.该模型体现平面非均质对产能方程的影响,可分析水平井筒内的压力和流量变化.结果表明,该模型计算误差为2.18%,满足工程要求,为该类水平井产能计算提供了有效方法.

The horizontal well can increase the contact area with the reservoir,lower production pressure;therefore,it has become an effective way to improve deliverability of gas wells.Permeability heterogeneity in horizontal direction is an important characteristics in low-permeability oil and gas reservoirs where horizontal well flow mechanism is very complicated.Deliverability model conformed to the first law of thermodynamics and Darcy’s law,and took the reservoir-horizontal wellbore cross-flow and horizontal-wellbore friction into consideration.The result shows that the error of the new model is 2.18%,and it provides an effective method to predict horizontal well deliverability for reservoir with permeability heterogeneity in horizontal direction.