Methodological and Theory

Adaptability of heterogeneous flooding system to low-medium permeability reservoirs

  • Jun LU ,
  • Zhuo ZHANG ,
  • Lisheng YANG ,
  • Linlin GUO ,
  • Xiaojing ZHANG
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  • 1.Oil and Gas Development Management Division, Sinopec Henan Oilfield, Nanyang, Henan 473132, China
    2.Petroleum Exploration and Development Research Institute, Sinopec Henan Oilfield, Nanyang, Henan 473132, China
    3.Henan Zhengjia Green Energy Co., Ltd., Zhengzhou, Henan 452370, China
    4.No.2 Oil Production Plant, Sinopec Henan Oilfield, Nanyang, Henan 473400, China

Received date: 2020-05-20

  Online published: 2021-01-07

Abstract

Wang-17 Block of Wangji Oilfield is the first zone in China to carry out polymer flooding EOR test with multi-stage heterogeneous profile control slug in oil reservoirs with low-medium permeability. The objective is to form the matching technology of chemical flooding in small fault block and low-medium permeability reservoirs, and to lead, demonstrate and use the remaining Class I and Class II chemical flooding reserves of 3 512×104 t in Henan Oilfield. The keys of the technology are adaptability of flooding agent to reservoir, effective plugging of extreme water-consuming layers and well pattern adjustment. Therefore, starting with the adaptability of polymer and preformed particle gel(PPG) to reservoir, the grain size distribution of PPG and the factors affecting water absorption and swelling of viscoelastic particulate have been studied and the salt resistance, shear resistance and thermal stability have been characterized. Meanwhile, the relation between particle number and concentration, the possibility of injection, the oil displacement efficiency and the diversion rate of heterogeneous system have been evaluated. The results show that the optimized heterogeneous flooding system has better adaptability to low-medium permeability reservoirs. Field application has achieved the effect of increasing oil production and reducing water, which provides technical support and significant reference to EOR in the similar oil reservoirs.

Cite this article

Jun LU , Zhuo ZHANG , Lisheng YANG , Linlin GUO , Xiaojing ZHANG . Adaptability of heterogeneous flooding system to low-medium permeability reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(6) : 17 -23 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.06.003

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