Abstract
Chengdao Oilfield in Shengli was seriously submerged at the later stage of waterflood development, and its water content reached 85%. In view of the high water content of Chengdao Oilfield and the prominent contradictions with reservoirs, this paper studies the difficulties existing in offshore oilfield profile control and the profile control agent system for Chengdao Oilfield history. At the same time, the profile control effects of YG103 gel system, HST gel system, self-crosslinking gel system and DQG gel system used for profile control of Chengdao Oilfield were evaluated. According to the statistical data, the average production increment of YG103 jelly system per well group is 2137.8t, HST-1 jelly system per well group is 1924t, self-crosslinking jelly system per well group is 526t, DQG jelly system per well group is 182t. This paper analyzes the reasons why the profile control and production increasing effect of Chengdao Oilfield gradually becomes worse. Based on the research results, suggestions for improvement were put forward.
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