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Study on the Mechanism of Water Blocking in Tight Sandstone Gas Reservoirs Based on Centrifugal and Nuclear Magnetic Resonance Methods

Author

Listed:
  • Jianye Zhang

    (Faculty of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
    Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China)

  • Yong Tang

    (Faculty of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Hongfeng Wang

    (Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China)

  • Lan Huang

    (Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China)

  • Faming Liao

    (Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China)

  • Yongbing Liu

    (Faculty of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Yiming Chen

    (Department of Petroleum Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada)

Abstract

Tight sandstone gas reservoirs are characterized by deep burial, high pressure, tight matrix, fracture development, and the prevalence of edge and bottom water. Because of the small pore throats, the phenomenon of capillary force is evident. In addition, the low permeability of the reservoir and the difference in fluid properties make the gas reservoir undergo severe water-blocking damage. In this paper, centrifugal and nuclear magnetic resonance methods are used. The relationship between pore throat characteristics, fluid distribution, and gas reservoir water-blocking mechanism is studied and analyzed. The experimental results show that fracture formation increases the porosity of the small pores and expands the pore size distribution. It is conducive to the displacement of the bound water in the small pore space and the reduction in the bound water saturation. When increasing the same displacement pressure, the core porosity increases. More residual water in the tiny pores is converted to moveable water, thereby reducing the capillary resistance. The high-angle penetration fractures and complex seam networks are created by fractures. They connect the pores to form a fracture network structure, which is conducive to the communication of seepage channels. The increase in porosity and the creation of a complex fracture network make the water inrush along the fractures more even in the process of mining. This slows the advance speed of the water invasion front and reduces the damage of water blocking. The results enhance the understanding of the water invasion mechanism of edge and bottom water so as to improve the recovery factors of tight sandstone gas reservoirs.

Suggested Citation

  • Jianye Zhang & Yong Tang & Hongfeng Wang & Lan Huang & Faming Liao & Yongbing Liu & Yiming Chen, 2022. "Study on the Mechanism of Water Blocking in Tight Sandstone Gas Reservoirs Based on Centrifugal and Nuclear Magnetic Resonance Methods," Energies, MDPI, vol. 15(18), pages 1-12, September.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:18:p:6680-:d:913457
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    References listed on IDEAS

    as
    1. Mengfei Zhou & Xizhe Li & Yong Hu & Xuan Xu & Liangji Jiang & Yalong Li, 2021. "Physical Simulation Experimental Technology and Mechanism of Water Invasion in Fractured-Porous Gas Reservoir: A Review," Energies, MDPI, vol. 14(13), pages 1-15, June.
    2. Yue Dong & Xuesong Lu & Junjia Fan & Qingong Zhuo, 2018. "Fracture Characteristics and Their Influence on Gas Seepage in Tight Gas Reservoirs in the Kelasu Thrust Belt (Kuqa Depression, NW China)," Energies, MDPI, vol. 11(10), pages 1-22, October.
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