Petroleum Exploration and Development >

2019 , Vol. 46 >Issue 1: 116 - 124

DOI: https://doi.org/10.11698/PED.2019.01.11

OIL AND GAS FIELD DEVELOPMENT

Comparison ofoil displacement mechanisms and performances between continuous and dispersed phase flooding agents

  • SUN Zhe ,
  • WU Xingcai ,
  • KANG Xiaodong ,
  • LU Xiangguo ,
  • LI Qiang ,
  • JIANG Weidong ,
  • ZHANG Jing
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  • 1. China National Offshore Oil Corporation (CNOOC)Research Institute Co., Ltd., Beijing 100028, China;
    2.College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China;
    3.State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China;
    4.Research Institute of Petroleum Exploration & Development, PetroChina,Beijing 100083, China;
    5.Key Laboratory of Enhanced Oil Recovery of Ministry Education, Northeast Petroleum University, Daqing163318, China;
    6.Development and Production Department, CNOOC Ltd., Beijing 100010, China;
    7.PetroChinaDaqing Oilfield Company, Daqing163000, China

Received date: 2018-04-08

  Revised date: 2018-07-30

  Online published: 2018-08-21

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Abstract

To compare the oil displacement mechanisms and performances of continuous phase flooding agent (traditional polymer solution) and dispersed phase flooding agent (particle-type polymer SMG dispersion), the particle phase separation of SMG dispersionmigrating in pores was simulated by using the microfluidic technology. Theoretically guided by the tree fork concentration distribution of red cells in biological fluid mechanics, the concentration distribution mathematical model of SMG in different pores is established. Furthermore, the micro and macro physical simulation experiments of continuous and dispersed phase flooding agents were carried out. The results show that the continuous flooding agent enters all the swept zones and increases the flow resistancein both larger and small pores. On the contrary, the particle phase separation phenomenon occurs during the injection process of dispersed flooding agent. The SMG particles gather in the larger pore to form bridge blinding, and the carrier fluid displace oil in the small pore. Working in cooperation, the SMG particle and carrier fluid drive the residual oil in the low permeability layers step by step and achieve the goal of enhanced oil recovery. The laboratory experimental results indicate that, the oil increment and water reduction effect of dispersed flooding agent is much better than that of continuous flooding agent, which is consistent with the field test results.

Key words： polymer flooding; particle-type polymer; polymer water dispersion; particle phase separation; microfluidic technology; deep fluid diversion ability; oil displacement mechanism

Cite this article

SUN Zhe , WU Xingcai , KANG Xiaodong , LU Xiangguo , LI Qiang , JIANG Weidong , ZHANG Jing . Comparison ofoil displacement mechanisms and performances between continuous and dispersed phase flooding agents[J]. Petroleum Exploration and Development, 2019 , 46(1) : 116 -124 . DOI: 10.11698/PED.2019.01.11

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