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Tailored Injection Water Slug Designs for Enhanced Oil Recovery in Carbonates

机译:量身定制的注水塞设计提高了碳酸盐油的采收率

摘要

Provided are oil recovery compositions and processes for enhancing oil recovery from a carbonate reservoir. A process for enhancing oil recovery includes injecting a first slug of an aqueous solution having a salinity in the range of about 5,000 ppm TDS to about 7,000 ppm TDS and sulfate ions in the range of about 500 ppm to about 5000 ppm. After injection of the first slug, the process includes injecting a second slug of an aqueous solution having a salinity in the range of about 5,000 ppm TDS to about 7,000 ppm TDS, calcium ion concentrations in the range of about 100 ppm to about 1000 ppm, and magnesium ions in the range of about 200 ppm to about 2000 ppm. A third slug of seawater or produce water may then be injected as chase water.
机译:提供了采油组合物和用于增强从碳酸盐岩储层采油的方法。增强油采收率的方法包括注入第一段盐度为约5,000ppm TDS至约7,000ppm TDS的水溶液和硫酸根离子为约500ppm至约5000ppm的硫酸盐。在注入第一段塞之后,该方法包括注入第二段含盐度在约5,000ppm TDS至约7,000ppm TDS,钙离子浓度在约100ppm至约1000ppm,镁离子在约200ppm至约2000ppm的范围内。然后可以注入第三段海水或采出水作为追赶水。

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