Abstract: 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 formalion 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.

Key words: waterplugging and injection conformance, the damage of oil formation, temporary plugging, selective injection