Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 143-150.doi: 10.12108/yxyqc.20190216

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Oil displacement methods for enhanced oil recovery after polymer flooding

HAN Peihui1,2, YAN Kun1, CAO Ruibo2, GAO Shuling2, TONG Hui1   

  1. 1. School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Research Institute of Exploration and Development, PetroChina Daqing Oilfield Company Ltd., Daqing 163318, Heilongjiang, China
  • Received:2018-11-15 Revised:2018-12-29 Online:2019-03-21 Published:2019-03-21

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Abstract: Field tests of high concentration polymer flooding and ASP flooding after polymer flooding have been carried out in Daqing Oilfield. Although the above two methods can achieve technical effects, the amount of polymer used is large and the economic benefit is low. In order to realize low-cost and high-efficiency production,on the basis of deep understanding of reservoir characteristics after polymer flooding,according to the combination of plugging, profile control and flooding technology,three new oil displacement methods were further studied by physical simulation experiment and formula optimization technology. (1) The combined injection and oil displacement method of "plugging agent+oil displacement system",which was injected into ASP system through low initial gel particles and then injected into the system of ASP. The polymer can be greatly reduced,and the recovery factor is increased by 2.1% and the polymer consumption is 25% compared with the ASP flooding. (2) Heterogeneous composite flooding system composed by continuous phase ternary solution and discontinuous phase PPG, which can realize dynamic adjustment and displacement. After polymer flooding, heterogeneous composite flooding can improve oil recovery by 13.6%, which is 3.4% more than that of ASP flooding. (3) Composite flooding with intercalated polymer flooding after polymer flooding was developed. The residual resistance coefficient of intercalated polymer is greater than resistance coefficient,and the plugging control ability is stronger than that of common polymer. After polymer flooding,the oil recovery can be increased by 15.9%. In view of the good results obtained in laboratory experiments of the three new oil displacement methods mentioned above and the significant reduction of chemical agent dosage compared with conventional ASP flooding,it is proposed to carry out field tests to verify the technical and economic results.

Key words: after polymer flooding, field test, new oil displacement methods, enhanced oil recovery

CLC Number: 

  • TE357
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