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Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process

Author

Listed:
  • Chunyu Hu

    (Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, China)

  • Jianqiang Tao

    (Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, China)

  • Meng Feng

    (Oil Test Company, Karamay 834000, China
    CNPC Xibu Drilling Engineering Co., Ltd., Karamay 834000, China)

  • Qian Wang

    (Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China)

  • Hui Cao

    (Exploration and Development Research Institute of Qinghai Oilfield Branch, China National Petroleum Corporation, Dunhuang 736202, China)

  • Hongmei Su

    (Xinjiang Uygur Autonomous Region Coalfield Geology Bureau 156 Coalfield Geological Exploration Team, Urumqi 830009, China)

  • Junke Sun

    (1st Oil Plant of PetroChina Qinghai Oil Field Branch Company 816499, Dunhuang 736202, China)

  • Wenfeng Wang

    (School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

The shallow, thin super-heavy oil reservoir demonstrates certain characteristics, such as shallow reservoir depths, low-formation temperature, and high crude oil viscosity at reservoir temperatures. In the current production process, the central area of P601 is undergoing high-frequency huff and puff operations, facing certain problems such as decreasing production, low recovery rates, and rapid depletion of formation pressure. Through physical simulation experiments, the various elements of HDNS-enhanced oil recovery technology were analyzed. Nitrogen plus an oil-soluble viscosity reducer can improve the thermal recovery and development effect of super-heavy oil. With the addition of the viscosity-reducing slug, the recovery rate of steam flooding was 58.61%, which was 23.32% higher than that of pure steam flooding; after adding the 0.8 PV nitrogen slug, the recovery rate increased to 76.48%. With the increased nitrogen injection dosage, the water breakthrough time was extended, the water cut decreased, and the recovery rate increased. Nitrogen also plays a role in profile control and plugging within the reservoir; this function can effectively increase the heating range, increase steam sweep efficiency, and reduce water cut. So, the synergistic effects of steam, nitrogen, and viscosity-reducing agents are good. This technology enhances the development of shallow-layer heavy oil reservoirs, and subsequent development technologies are being compared and studied to ensure the sustainable development of super-heavy oil reservoirs.

Suggested Citation

  • Chunyu Hu & Jianqiang Tao & Meng Feng & Qian Wang & Hui Cao & Hongmei Su & Junke Sun & Wenfeng Wang, 2024. "Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process," Energies, MDPI, vol. 17(23), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:23:p:6024-:d:1533426
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    References listed on IDEAS

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    1. Zhang, Kaiqiang & Jia, Na & Li, Songyan & Liu, Lirong, 2019. "Static and dynamic behavior of CO2 enhanced oil recovery in shale reservoirs: Experimental nanofluidics and theoretical models with dual-scale nanopores," Applied Energy, Elsevier, vol. 255(C).
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