Experimental Study and Field Application of Acid Resolving Plugging in A Oilfield of Bohai Sea
During the development process of A oilfield in Bohai Sea,the fluid production of production wells decreased obviously,the water injection pressure of water injection wells increased,and the difficulty of water injection was great.It was considered that the migration of sensitive minerals and mud in formation led to the blockage of pore-throat.In view of the above problems,the geological characteristics of this oilfield were studied,and the reasons for formation plugging were analyzed.On this basis,laboratory experiments were carried out to study a set of main acid system of fluoroboric acid,and the additives were optimized to improve performance through experiments.The field application showed that for A7 production well,heavy scale cleaning agent was used to dissolve wax and gelatinous asphaltine,and fluoroboric acid treating agent was used to acidify the formation,the index of recovered liquid after acidification was obviously increased.For B6 water injection well,using fluoroboric acid treatment agent and split liquid phase combined with acidification treatment,the water injection pressure decreased significantly,and the water absorption index increased significantly.
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