Petroleum Reservoir Evaluation and Development >

2020 , Vol. 10 >Issue 6: 78 - 84

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2020.06.012

Field Application

Heterogeneous combination flooding system for reservoir after polymer flooding in Shuanghe Oil Filed

  • Zhengxin WANG ,
  • Lianfeng ZHANG ,
  • Lu YANG ,
  • Yanhua LIU ,
  • Jun LU ,
  • Zhuo ZHANG
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  • 1.Exploration and Development Research Institute, Sinopec Henan Oilfield, Nanyang, Henan 473132, China & Henan EOR Key Laboratory, Nanyang, Henan 473132, China
    2.Oil and Gas Development Management Division, Sinopec Henan Oilfield, Nanyang, Henan 473132, China

Received date: 2020-06-09

  Online published: 2021-01-07

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Abstract

For the reservoirs after polymer flooding, the heterogeneity is stronger and the remaining oil distribution is more dispersed, conventional chemical flooding in consequence is difficult to further improve oil recovery effectively. Therefore, a heterogeneous combination flooding system consisting of polymer, preformed particle gel（PPG） and highly effective surfactant has been designed according to the features of medium-high permeability sandstone reservoir in Ⅱx layers of Shuanghe Oil Filed after polymer flooding. Thereafter, the selection of flooding agent, evaluation of thermal stability and Optimization of injection mode have been studied. The experimental results showed that the obtained P/PPG/S system has excellent high viscoelasticity, ultra-low interfacial tension, and thermal stability, which can effectively improve reservoir heterogeneity, expand sweep volume and enhance oil displacement efficiency. Core displacement experiments showed that the oil recovery could further enhance by 27.8 % after the combination flooding of P/PPG system and P/PPG/S system under simulated reservoir conditions. Thus it provides a technical method for effectively enhancing oil recovery after polymer flooding in Shuanghe oilfield.

Key words： reservoir after polymer flooding; heterogeneous combination flooding system; preformed particle gel（PPG）; surfactant; enhanced oil recovery（EOR）

Cite this article

Zhengxin WANG , Lianfeng ZHANG , Lu YANG , Yanhua LIU , Jun LU , Zhuo ZHANG . Heterogeneous combination flooding system for reservoir after polymer flooding in Shuanghe Oil Filed[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(6) : 78 -84 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.06.012

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