超低渗油藏水平井与直井联合井网参数优化

Optimization of fracturing parameters in well pattern with horizontal and vertical wells combined in Super- low permeability oil reservoir

针对元284区块压裂水平井与直井联合开采井网参数优化问题,利用非线性渗流数值模拟软件,对水平井长度、裂缝分布形态、注水井井间距离、注水井排与水平井垂直距离、稳油控水政策进行了研究.结果表明：元284区块最佳的水平井长度为800 m,裂缝分布形态为间断型纺锤形分布,注水井井间距离为500～ 550 m,注水井排与水平井垂直距离为350～ 400 m,采用缩短中间裂缝长度至80m和减半中间注水井注水量的方法,可取得稳油控水的效果.该参数优化方法对同类油田的优化设计有借鉴意义.

For optimization of fracturing parameters in the well pattern with horizontal and vertical wells combined,a study is made on the length of horizontal well,behavior of fracture distribution,inter- well distance between water injectors,vertical distance between injector row and horizontal well and policy for water control and oil production stabilization by use of non- linear porous flow numerical simulation software. It is indicated from the study that,the optimal length of horizontal well is 800 m in the Yuan- 284 block,the fracture distribution is preferred to be in an intermittent spindle form,the inter- well distance between injectors to be 500 – 550 m,the vertical distance between injector row and horizontal well to be 350 – 400 m,and water control and oil production stability can be realized by means of a middle fracture length shortened to 80 m and a water injection volume in the middle injector reduced by half. The parameter optimization provides reference for the optimized design of similar oilfields.