DEVELOPMENT METHOD OF CARBONATE OIL FORMATION (OPTIONS) Russian patent published in 2017 - IPC E21B33/138 E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: development methods of carbonate oil formation include waterproofing operations in production wells by injecting a plugging composition, followed by the bottomhole zone treatment with acidic composition, technological aging, and well completion. According to the first embodiment, the new is that as the plugging composition for waterproofing operations a composition is used comprising xanthan, polyacrylamide PAA, chromium acetate and fresh water, at the following component ratio, wt %: xanthan 0.1-1.5, 0.1-1.0 PAA, chromium acetate 0.01-1.0, and fresh water is the rest. Wherein the said composition is forced into the formation with the process fluid of density corresponding to the well-killing fluid, the well is left for process conditioning for 96-240 hours, then the wellbore area is processed with an acidic composition; as acidic composition, a composition is used comprising inhibited hydrochloric acid, sulfamic acid, ammonium acetate, ethoxylated alkylphenol and fresh water, at the following component ratio, wt %: inhibited hydrochloric acid 0-80.0, sulfamic acid 1.0-15.0, ammonium acetate 1.0-6.0, ethoxylated alkylphenol 0.01-1.0, fresh water is the rest. After acid treatment, the well is left for process conditioning for 2-24 hours, and the well is completed.

EFFECT: increased oil recovery due to increased formation coverage by exposure, connection to the development of previously unreached oil-saturated interlayers, increased filtration properties of the carbonate reservoir matrix, and expansion of the method technological capabilities.

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