Development and application of the environmental response temporary plugging agent for well killing of CCUS oil reservoir
At present,CCUS technology is being widely promoted and applied in various oil fields in China.Due to the severe corrosion of CO2 on the wellbore,the workload of workover has been increasing year by year.It is urgently needed to develop a temporary plugging agent for killing wells to temporarily block oil and gas in the target layer of the wellbore,effectively kill the well,and ensure the smooth completion of workover.After the workover,the temporary plugging agent automatically removes the plugging and quickly resumes production.This article proposes a research idea for the environmental response temporary plugging agent.The temporary plugging agent is composed of HPAM,organic chromium crosslinking agent A,active crosslinking agent B,and GB-01 gel breaker.It quickly forms gel under the action of the composite crosslinking agent and maintains high strength and stability for about three days,achieving effective temporary plugging and well killing.After the completion of workover,the temporary plugging agent quickly achieves environmental response gel breaking under the action of a small amount of gel breaker(high temperature,high mineralization,high CO2 concentration),and completely removes the plugging within 2-5 days,thus quickly resuming production.The temporary plugging agent has been tested on-site in a certain well of Jilin Oilfield,and has achieved good results.The research idea of the environmental response temporary plugging agent is feasible,and it provides reference for the on-site application of CCUS oil reservoir well killing and temporary plugging technology in China.
CCUSwell killing and workovertemporary plugging agentautomatic glue breakingcomprehensive performanceon-site application
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