复杂结构井数值模拟分段耦合模型

Multi-segment coupling model of numerical simulation of complex structural wells

针对复杂结构井的油藏渗流特征和井筒流动特点,分别建立油藏质量守恒方程、井筒质量守恒方程和井筒动量方程,采用井筒分段的方法对复杂结构井进行分段、编号,并与油藏网格相匹配,结合数值模拟矩阵'镶边'处理方法实现复杂结构井油藏和井筒的耦合,利用全隐式方法进行求解。以鱼骨状分支井为例进行计算分析。结果表明,复杂结构井分段耦合模型能够充分体现油藏渗流和井筒变质量流的相互影响,改进后的数值模拟软件可以满足复杂结构井生产动态模拟的需求。

According to the percolation characteristics in reservoir and wellbore flow, the mass conservation equations sepa- rately in the reservoir and in the wellbore, and the momentum equation in the wellbore were developed. A complex structural well were segmented, and the segments were numbered, and then matched with the reservoir grids. Combined with the bor- dered matrix method in numerical simulation, the reservoir and the wellbore of a complex structural well were coupled, and the problem was solved using the fully implicit method. A herringbone well was analyzed. The results show that the multi- segment coupling model of a complex structural well can fully reflect the interaction between the percolation in the reservoir and the variable mass flow in the wellbore. The improved numerical simulation software can satisfy the requirement of produc-tion dynamic simulation for complex structural wells.