FORMATION DAMAGE CAUSED BY INJECTION WATER

By the research of Block Chun-2 in Shengli Oilfield, a laboratory core simulating test is performed to investigate the formation damages caused by different injection speed, suspending solid particle, oil content, bacterial concentration and surface active agent. The result of study shows that severe formation damages are caused by suspending solid particle, oil content and bacterial concentration. It’s suggested to reduce the formation damages by the multi-control methods of oil content less than 10.6mg/L in injection water, bacterial concentration less than 10/mL, middle size of suspending solid particle less than 1.2μm and adding JOP-1 surface active agent.