论文部分内容阅读
低渗透气藏开发是目前油气藏开发的难点,往往采用水平井水力压裂的方法以增加产能,而许多低渗气藏的产能模型没有考虑气体滑脱及裂缝间干扰所带来的影响。运用以叠加原理及等值渗流阻力原则等方法,将低渗气藏压裂水平井完井后流体的渗流区划分为三个区域:裂缝内气体的达西线性流动,气体在基质中的径向渗流区以及水力压裂裂缝泄流引起的非达西椭圆渗流区。建立考虑气体滑脱、裂缝间干扰影响的压裂水平井产能计算模型,分析了不同滑脱效应下各流入动态曲线,结果表明:随滑脱系数增加,气井产量相应增大;井底流压越低,随滑脱系数的增加气井产量变化越明显。因此低渗气藏开发中气体滑脱效应不可忽视。
The development of low-permeability gas reservoirs is a difficult point in oil and gas reservoir development. Hydraulic fracturing of horizontal wells is often used to increase production capacity. However, productivity models of many low-permeability gas reservoirs do not consider the effects of gas slippage and inter-fracture interference. By using the principle of superposition and the principle of equivalent seepage resistance, the fluid seepage zone of fractured horizontal wells in low permeability reservoirs is divided into three areas: the Darcy linear flow of gas in the fractures, the diameter of the gas in the matrix Non-Darcy elliptic seepage zone caused by seepage zone and hydraulic fracture leakage. The computational model of fractured horizontal well productivity considering the effects of gas slippage and inter-fracture interference is established. The inflow dynamic curves under different slippage effects are analyzed. The results show that the gas well production increases with the increase of slip coefficient, The increase of slippage coefficient is the more obvious change of gas well output. Therefore, the gas slippage effect in the development of low permeability reservoirs can not be ignored.