断块油藏水平井压力动态模型

水平井开发为断块油藏主要开发方式.针对这一现状,建立了上下边界封闭、水平方向存在断层的油藏中一口水平井三维不稳定渗流模型.采用Green函数和叠加原理方法求解了在Laplace空间下水平井井底压力计算公式,并利用改进的Stehfest算法反演得到实空间的井底压力.为提高压力公式的计算速度,引入了一种快速计算方法,大大提...

Pressure dynamic model of horizontal well in fault-block oil reservoir

With the wide exploitation of fault-block oil reservoir,horizontal well is recognized as the main development way nowadays.Aimed at this situation,this paper established the 3D unsteady flow model of horizontal well in the reservoir with impermeable upper and lower boundaries whose horizontal direction is a fault.The semi analytical solutions were derived in Laplace space by means of both Green’s function method and Duhamel principle for horizontal well and the bottom-hole pressure in real space was worked out by modified Stehfest numerical inversion algorithm.To accelerate the calculation of bottom-hole pressure,a fast computation method was introduced,which greatly improved the velocity of calculation.The research shows that the distance of horizontal well to the fault is very important for reservoir pressure change.When a horizontal well can not drill into the fault,the influence of fault is not obvious,but it is obvious if the well drills into the fault.In conclusion,it is better that a horizontal well is parallel to the fault,which can provide a reference for the well pattern design of horizontal wells near the fault.