裂缝型低渗透油藏井网调整方式研究

STUDY ON WELL PATTERN ADJUSTMENT METHOD OF FRACTURED LOW-PERME ABILITY OIL RESERVOIR

依据大庆榆树林油田东16区块扶杨油层裂缝发育特征和注水开发动态特点,结合目前区块剩余油分布,分析裂缝对剩余油分布和开发效果的影响,为进行注采系统调整提供依据。针对东160和升371两个断块特点,各设计了4套加密方案,并进行开发指标预测方案优选。结果表明:东160断块裂缝方向与井排方向一致,油水井排之间不能形成有效驱替,应缩小井距,优选出的方案四,加密后东160断块形成大井距小排距的线状注水;升371断块裂缝方向与井排方向呈12.5°相交,油水井排之间能形成有效驱替,优选出的方案四,采用三角形重心加密,改变流场方向,更加有利于开采剩余油富集区。

Based on the fracture development characteristics and water flooding development performance of Fuyang Formation in Dong16 Block of Daqing Yushulin Oilfield and combined with the saturation distribution of remaining oil in present Block,the effect of fracture on remaining oil distribution and the development effectis analyzed,which provides evidence for the injection-production system adjustment.According to the characteristics of Fault Block Dong160 and Fault Block Sheng371,4 sets of infill programs are designed and the development prediction index is optimized.There sults show that fractureis in the same direction with well line in Fault Block Dong 160 and effective displacement can not be established between oil and water well lines,so the well spaces should be shorten.After infilling wide spacing and small row spacing the linear water injection is formed.In Fault Block Sheng371 fracture direction is at the angel of 12.5° to well line direction and effective displacement can be established between oil and water well lines.The optimized Program 4 in which the triangular gravity infilling is selected to change flow field direction is more beneficial to exploit remaining oil enriched areas.