西南石油大学学报(自然科学版)

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The Distribution of Residual Polymer and the Synergistic Action of Binary Combination Flooding After Polymer Flooding

Xie Xiaoqing1,2*, Feng Guozhi1,2, Liu Liwei1,2, Shi Yao1,2, Zeng Yang1,2   

  1. 1. State Key Laboratory of Offshore Oil Exploitation,Chaoyang,Beijing 100028,China
    2. CNOOC Research Institute,Chaoyang,Beijing 100028,China
  • Online:2015-08-01 Published:2015-08-01

Abstract:

To maximize the benefit of residual limited polymer in the reservoir,we carried out a study on the distribution of
residual polymer and the synergistic action of binary combination flooding after polymer flooding. On the basis of the survey
and summary of the improved oil recovery methods after polymer flooding at home and abroad,the 3D plane large physical
model experiments were carried out which accorded with the geological characteristics in offshore oil field S block. By sampling
and monitoring the contour diagram of polymer solution viscosity field,concentration field and stress field during the different
stages of water flooding,polymer flooding,binary combination flooding and subsequent water flooding,the distribution law of
residual polymer and the influence of binary combination flooding after polymer flooding were obtained. The results show that,
at the end of the polymer flooding,the concentration of mainstream line was the highest,and the concentration of two wings
was the smallest. At the end of subsequent water flooding,the concentration of mainstream line was the smallest,and most
of the polymer was driven out. The more residual polymer in core,the stronger the auxiliary function of binary combination
flooding. After the polymer injection,the earlier implement of replacement technology,the better development effect. The
study has important guiding significance for research on how to use the replacement technology after polymer flooding.

Key words: polymer flooding, enhanced oil recovery, residual polymer, binary combination flooding, polymer recycling
technology