底水油藏水平井最优避水高度及合理长度的研究

摘要

底水锥进是开发底水油藏时遇到的最大问题,制约着水平井的有效开发.应用Green函数和源函数法对底水油藏水平井的压力分布进行了半解析求解,推导了见水时间和临界产量公式.通过实例计算分析了避水高度和水平井段长度对见水时间和临界产量的影响,确定了底水油藏水平井的最优避水高度和水平井段合理长度.该方法对提高水平井的开采效果和节约开采成本具有一定的理论指导意义.%Bottom water coning is the biggest problem in the exploitation of bottom water reservoir,which prohibits the valid exploitation of horizontal wells. Green function and source function are used to find the semi-analytic expression of the pressure distribution of the horizontal well in bottom water reservoir, and the critical production formula and water breakthrough are obtained time formula. The influence of avoidance water height and horizontal section length on water breakthrough time and critical production was analysised, ascertain of the water avoidance height from the bottom water reservoiv and the horizontal section of reasonable length. This research provides the theoretic guidance enhances the effective exploitation of the horizontal well and economize the cost of mining.