莫北油田低渗透油藏开发压裂方案设计

DESIGN OF THE DEVELOPING FRACTURING PLAN FOR THE LOW-PERMEABILITY RESERVOIRS IN MOBEI OILFIELD

莫北油田莫116井区属于低孔低渗储层,需压裂方可投产.通过布井前储层地应力的研究,分析了压裂裂缝的方向,并通过数值模拟研究了与之相匹配的井网方位.在机理模型的基础上,对并排距、裂缝穿透率及裂缝导流能力进行了优化,确定了不同井网类型下最优参数组合方案.最后在区域地质模型上对2井网组合方案下的累计产油量、综合含水率和采出程度等指标进行了对比分析,筛选出最终目的工区的最优井网与裂缝组合方案为与裂缝垂直的五点排状注水井网,井排距为350 m×200 m,油井的穿透率为0.8,水井穿透率为0.4,裂缝导流能力50 μm2·cm.

Wellblock Mo116 in Mobei Oilfield is characterized by low-porosity and low-permeability reservoirs, so the fracturing should be stimulated to put it into production. By reservoir in-situ stress study before the well loca- ting, the directions of the fractured cracks are analyzed, and moreover through the numerical simulation, the matc- hing pattern orientations are researched. On the basic of the mechanism model, the well space and well array dis- tance, fracture penetration ratio and fracture flow conductivity are optimized, and then the optimal parameter com- bination scheme is determined under different well pattern types. In the end, on the basis of the regional geological model, the cumulative production, comprehensive water production, recovery degree and so on are contrasted and analyzed under two-pattern combination plan, the most optimal combination scheme for the well patterns and frac- tures is selected for the final target operation area i. e. five-spot linear injection pattern perpendicular to the frac- ture direction, which the well array is 350 m×200 m, the penetration ratios of the oil and water wells are 0. 8 and0. 4 respectively, the fracture flow conductivity is 50 μm2 · cm.