菱形反九点井网不等缝长整体压裂设计

Integral fracturing design with unequal fracture length in diamond inverse 9-spot well pattern

菱形反九点井网在低渗透各向异性油藏中具有较好的适应性。在整体压裂开发方式下,井排距的确定不但受储层各向异性程度影响,同时与边井压裂缝长密切相关。边、角井等缝长压裂会导致边井先见水,不利于角井方向的有效驱替。数值模拟结果也验证了此结果。通过以上研究,进行了不等缝长整体压裂优化研究,结果表明,不等缝长压裂可以提升菱形反九点井网开发效果。

Diamond Inverse 9-spot well pattern is better adaptable to low permeability anisotropy reservoirs.Under the development scheme of integral fracturing,the determination of well space and row space are not only influenced by the degree of reservoir anisotropy,but also is closely relevant to the fracturing length of marginal wells.Equal fracture length fracturing in marginal or angle wells can cause the earlier water breakthrough in marginal wells,which is not favorable for the effective drainage of the angle wells.Numerical simulation also confirms this result.Based on the study above,the study on the optimization of integral fracturing with unequal fracture length is conducted and the study result shows that unequal fracture length fracturing can improve the development efficiency with diamond inverse 9-spot well pattern.