暂堵与堵水配套技术实现选择性堵水研究

RESEARCH OF THE SELECTIVE WATER PLUGGING ACHIEVED BY THE TEMPORARY PLUGGING TECHNOLOGY

针对笼统堵水调剖作业中非目的层受到伤害的问题,从理论上证明了对于多层油藏,若不对非目的层进行保护,则堵液对其伤害是很大的,从而使措施失去效用。利用凝胶体系在低渗层表面形成快速堵塞的原理,采用一种成胶和破胶时间均可控的暂堵凝胶体系,与后续注入的堵剂体系配套使用,岩芯流动实验表明,这种方法可以使绝大部分堵液进入高渗层,从而大大减少对非目的层的伤害。

According to the nontarget formation damage caused by the water plugging and injection conformance, it was proved from the theory that the plugging agent would damage the nontarget formation unless it could be protected. The above results often caused the taken measure to lose its effect and even the damage. Applying the theory that the injected gel easily forms the temporary plugging on the injection side, we developed the temporary plugging agent that gelling time and gel time could be controlled, and the temporary plugging agent was applied with the followed plugging agent. The core flooding experiment indicated that the method could make most of injected plugging agent enter the high permeability formation, so it would reduce the damage of nontarget formation.