Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 141-148.doi: 10.12108/yxyqc.20200216

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Three-dimensional water flooding physical simulation experiment of horizontal well in heavy oil reservoir with strong bottom water

DU Xulin1, DAI Zong2, XIN Jing1, LI Hailong2, CAO Renyi1, LUO Donghong2   

  1. 1. College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Shenzhen Branch Company, CNOOC, Shenzhen 518067, Guangdong, China
  • Received:2019-06-11 Revised:2019-08-14 Online:2020-03-21 Published:2020-01-19

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Abstract: The marine sandstone heavy oil reservoirs in the Pearl River Mouth Basin in the South China Sea are characterized by strong energy of bottom water,non-uniformed distribution of interlayers,and difficult development. Conventional experimental standards barely reveal reservoir sweep feature under high-intensity water flooding. A three-dimensional water flooding physical simulation experiment of horizontal well was designed based on the characteristics of the heavy oil reservoir named X in Pearl River Mouth Basin. The oil viscosity and interlayer distribution range were proposed as the main controlling factors affecting water flooding effect, and the characteristics of water cresting and sweep feature in water flooding development of heavy oil reservoirs with strong bottom water were analyzed. The results show that the changing process of water cresting in heavy oil reservoir is local coning-local water breakthrough-local upper support-expansion around water breakthrough point. There exists obvious oil-water transitional zone in heavy oil reservoir water flooding, and the sweep region is limited in the late stage of development, so large displacement measures can be used. The remaining oil in the oil-water transitional zone of flood sweep zone is a potential tapping target. The problem of heterogeneity along horizontal wells should be focused on the development of heavy oil reservoirs water flooding. For heavy oil reservoirs with interlayer, there is a small amount of residual oil at the bottom of the small range interlayer. Since the secondary edge water is easily formed when the bottom water flows around the large interlayer so that the sweep region along the wellbore direction increases greatly, and there is a large amount of residual oil at the bottom of the interlayer called "eaves oil". This study can provide research direction for waterproofing and tapping potential of remaining oil of heavy oil reservoirs with strong bottom water.

Key words: heavy oil reservoirs with strong bottom water, three-dimensional water flooding experiment, interlayer, water cresting, sweep feature, Pearl River Mouth Basin

CLC Number: 

  • TE345
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