Abstract: Low permeability reservoirs commercial development is usually obtained by fracturing stimulation.The development of low permeability reservoirs is different from that of normal reservoirs because of the appearance of hydraulic fractures.Severe heterogeneity usually exist due to the permeability anisotropy resulted from developed or tensile natural fractures in low permeability reservoirs.As a result,it is necessary to take into account the effect of heterogeneity of both hydraulic fractured and permeability while planing well pattern.This paper presents the research of inverted nine-spot pattern which is normally used in the development of low permeability reservoirs and modified inverted nine-spot pattern and rectangular pattern.It shows that higher oil recovery and economic efficiency would be achieved by adopting the rectangular pattern if the azimuth of hydraulic fracture is clearly known.

Key words: low permeability, development well pattern, rectangle, inverted nine-spot, anisotropy

摘要： 低渗透油藏常常通过压裂改造获得工业开发价值,而压裂所产生的水力裂缝的存在,使得低渗透油藏的整个开发过程展现具有与常规油藏开发不同的特点.低渗层常发育隐含或张开的天然裂缝,使渗透率存在明显的方向性而导致注水、采油过程中出现严重非均质性.因此,低渗透油藏的开发井网的设置应考虑水力裂缝和渗透率各向异性的影响并与之优化匹配.本文模拟研究了低渗透油田开发常用的反九点井网和不常用的变形反九点及矩形井网,研究表明:在裂缝方位认识比较清楚的情况下,矩形井网将获得较高的采收率和经济效益.

关键词: 低渗透, 开发井网, 矩形, 反九点, 各向异性