RECONDITION INJURY CASING WITH PLUGGING AGENT IN OIL AND WATER INJECTION WELLS

With the technology of recondition injury casing with plugging agent in oil and water injection,the problems of chemistry agent halt and stay, of interface cementation intension, of security about constructing with plugging agent. The new agent YLD-1 can form fibre net structure rapidly,so it can efficiency halt and stay in the annulus and in the thief zone. The rigidity and intension of interface transition layer bas been improved by virtue of the reaction produc- tion with active material of the agent and cementation material,moreover,the slightly expansion effect of the agent.The technology was used in twenty wells,which successful rate is 94%.