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LABORATORY STUDY OF COMPATIBILITY OF KILL FLUIDS WITH FORMATION WATER
Abstract
In the oil and gas industry the problem of utilizing produced water is solved by recirculating it and using it as a basis for fluids for hydraulic fracturing and the well killing. During the oil production formation water is extracted in association with it to the surface. Its component composition depends on both the chemical nature and geological age of rocks and it is formed as a rule with a significant impact of oil and gas on water that leads to a wide variety of its chemical properties. In the process of workover and underground well repair, as well as their preservation, well killing fluids interact with the formation fluids, rock mineral components and the surface of the downhole equipment. In the process of well killing incompatible liquids can cause the precipitation of mineral salts that subsequently leads to blocking the pores of the formation and a significant decrease of its permeability. When choosing fluids for well killing the most important measure is to preserve reservoir properties of the formation. When developing new compositions of fluids for well killing, as well as using existing ones, laboratory studies on their compatibility with formation water are an important point. The article presents the results of laboratory tests of the physicochemical parameters of well killing fluids used at one of the oil field in Russia. The authors of the article have carried out laboratory tests on the compatibility of well killing fluids and formation water in this region to minimize the negative impact of killing fluids on the formation. The evaluation of the corrosion activity to downhole equipment of studied solutions of well killing fluids was also accomplished.
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References14
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