Surfactant boosts polymer EOR effectiveness at Daqing

Field results and laboratory tests show that including surfactant treatments can lengthen the polymer injection effectiveness to 30 months from the 3 months previously experienced at the Daqing oil field.Currently polymer flooding in the field produces more than 12 million tonnes/year of oil (240,000 bo/d); however, the process required overcoming injectivity problems in the polymer injection wells.Daqing Oil Field Co. Ltd., a unit of PetroChina Co. Ltd., operates the field, which is in China’s northern Heilongjiang provincePolymer floodingAbout 12% of polymer injection wells at Daqing had poor injectivity or decreasing injectivity. Poor injectivity decreases the benefits of polymer...

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