Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 101-105.doi: 10.3969/j.issn.1673-8926.2016.04.014

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Adaptability of polymer to reservoir pore structure in Pubei Oilfield

Zhang Jihong，Guo Xin   

  1. （Key Laboratory of Enhance Oil and Gas Recovery of Education Ministry，Northeast Petroleum University，Daqing 163318，Heilongjiang，China）
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

In order to seek a polymer solution flooding method suitable for oil recovery in Pubei Oilfield of Songliao Basin, a mercury injection experiment with cores from A1 well field in Pubei Oilfield was carried out. Pubei Oilfield belongs to typical low permeability reservoir. By measuring the hydrodynamic diameter of common polyacrylamide polymer and salt?resistant polymer, this paper investigated the adaptability of two kinds of polymers to the reservoir pore strucutre under different preparation conditions from the microscopic aspect, and compared the displacement efficiency by cylindrical cores. The experiment result shows that the oil recovery enhanced by 700 mg/L of salt-resistant polymer is 3.22% higher than that by 1 200 mg/L of common polymer. It is proved that salt?resistant polymer is more suitable for the flooding in Pubei Oilfield.

Key words: shale gas-bearing property, unconformable surface, hydrocarbon expulsion, organic pores, Wufeng-Longmaxi Formation, Qiongzhushi Formation, Sichuan Basin and surrounfing area

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