OIL AND GAS FIELD DEVELOPMENT

Visualization experiments on polymer-weak gel profile control and displacement by NMR technique

  • DI Qinfeng ,
  • ZHANG Jingnan ,
  • HUA Shuai ,
  • CHEN Huijuan ,
  • GU Chunyuan
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  • 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;
    2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China

Received date: 2016-07-25

  Revised date: 2017-01-16

  Online published: 2017-05-22

Abstract

The distribution characteristics and migration pattern of weak gel in the core were observed by combining nuclear magnetic resonance (NMR) imaging technology with the core displacement experiment, and the oil displacement features of different polymer-weak gel combinations were examined with visualization experiments. Three combination patterns of polymer and weak gel were designed: waterflooding+ polymer flooding (pattern 1), waterflooding + polymer flooding + weak gel flooding (pattern 2), and waterflooding + weak gel flooding + polymer flooding (pattern 3). The pressure variations, T2 spectra, nuclear magnetic resonance images, oil displacement efficiencies under the different patterns were analyzed. The results show that the nuclear magnetic images can not only provide the direct information of weak gel distribution and migration characteristics inside the core, but also reflect the distribution characteristics of remaining oil; the T2 spectrum characteristics indicate that both polymer and weak gel have the function of profile control and oil displacement, and the pattern 2 has the best profile control effect; of the three patterns, pattern 2 has the highest oil displacement efficiency of 78.84%, which is 18.33% higher than the displacement efficiency of water flooding in the initial stage.

Cite this article

DI Qinfeng , ZHANG Jingnan , HUA Shuai , CHEN Huijuan , GU Chunyuan . Visualization experiments on polymer-weak gel profile control and displacement by NMR technique[J]. Petroleum Exploration and Development, 2017 , 44(2) : 270 -274 . DOI: 10.11698/PED.2017.02.12

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