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Oil recovery process using an oil recovery composition of aqueous salt solution and dilute polymer for carbonate reservoirs
Oil recovery process using an oil recovery composition of aqueous salt solution and dilute polymer for carbonate reservoirs
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机译：使用盐水溶液和稀聚合物的采油组合物进行碳酸盐油藏的采油工艺
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摘要
An oil recovery composition of an aqueous solution of one or more salts and dilute polymer and processes for enhanced oil recovery using the oil recovery composition are provided. An oil recovery composition may include an aqueous solution of one or more salts having a salinity of about 4000 parts-per-million (ppm) to about 8000 ppm, a polymer having a concentration of 250 ppm to 500 ppm, and metal oxide nanoparticles having a concentration in the range of 0.01 weight (wt) % to 0.05 wt %. The one or more salts may include sodium sulfate (Na2SO4). The polymer may include a copolymer of acrylamide and acrylamido tertiary butyl sulfonate (ATBS). The oil recovery compositions provided may be suited for enhancing oil recovery in carbonate reservoirs having in situ oil viscosities less than 3 centipoise (cP).
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机译：提供了一种或多种盐和稀聚合物的水溶液的采油组合物，以及使用该采油组合物增强采油的方法。采油组合物可以包括一种或多种盐度为约4000ppm至约8000ppm的盐的水溶液，浓度为250ppm至500ppm的聚合物以及具有浓度在0.01重量％至0.05重量％的范围内。一种或多种盐可以包括硫酸钠（Na 2 SO 4）。该聚合物可以包括丙烯酰胺和丙烯酰胺基叔丁基磺酸盐（ATBS）的共聚物。所提供的采油组合物可适合于提高原位油粘度小于3厘泊（cP）的碳酸盐储层中的采油量。
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