注采井网调整是提高老油田高合水期原油采收率的重要手段．通过对欢５０断块低渗透油层地应力和储层裂缝方向的研究，进行渗流场的数值模拟．找出了影响低渗透油层油水运动的主要因素．在此基础上提出了注采井网调整方案，为低渗透油田中晚期注采井网调整提供了依据． Well injection well network adjustment is to improve the old oil field high oil recovery rate of an important means. Through the study on the stress of the low permeable reservoir and the direction of reservoir fractures in Huan 50 fault block, the numerical simulation of seepage field is carried out. Identified the main factors affecting the movement of oil and water in low permeability reservoirs. Based on this, the adjustment plan of well pattern for injection and production is put forward, which provides the basis for the adjustment of well pattern in middle and late period of low permeability oilfield.