结垢对储层渗流能力的影响

针对油田水结垢问题,利用室内水质静态分析及岩心流动实验,对水质结垢趋势、垢物成份及结垢对岩心渗透率的影响进行了研究,结果表明:垢物以氢氧化铁、碳酸钡、碳酸钙为主,并含有少量碳酸镁;静态结垢对岩心渗透率的伤害率达9.6%;动态结垢对岩心的伤害率可达34.3%,铁离子沉淀对岩心渗透率的伤害率达56.7%。因此,水源水进入地层前,必须进行水源水与储层的配伍性实验研究,以建立相应的油层保护措施,尽量减少储层伤害,提高油藏开发效果。

Experimental Research of the Impact of Scale on Percolation Ability of Reservoir

In view of the oilfield water scaling problems, the scaling tendency, scaling component and core damage rate experiments were studied through indoor static analysis and the core flow experiment. The results showed that the main component of the scale was iron hydroxide, barium carbonate, calcium carbonate and a little magnesium carbonate. Static damage rate of scaling was 9.6%, and dynamic damage rate was 34.3%, and the damage rate of iron deposition was 56.7%. Hence, it is important to research on the compatibility of raw water and formation before injection raw water, which could reduce reservoir damage to the lowest limit and improve the development effect of oil field.