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Water Invasion Law and Water Invasion Risk Identification Method for Deep Sea Bottom-Water Gas Reservoir

Author

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  • Jiqiang Zhi

    (School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
    Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing 163318, China)

  • Lifeng Bo

    (School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
    Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing 163318, China)

  • Guohui Qu

    (School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
    Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing 163318, China)

  • Nan Jiang

    (School of Electrical Engineering & Information, Northeast Petroleum University, Daqing 163318, China)

  • Rongzhou Zhang

    (School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
    Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing 163318, China)

Abstract

This study analyzes the water invasion characteristics and water encroachment of the deep sea bottom-water gas reservoir (LS17 field) in the South China Sea for the purpose of developing horizontal wells. Gas-producing profile tests and a three-dimensional (3D) water invasion simulation are used to produce a quantitative analysis of the bottom-water cresting influence factors. On this basis, we establish a suitable risk identification method for the water influx of a deep bottom-water reservoir. The results show that: (1) During the development of a bottom-water gas reservoir, the water ridging is affected by reservoir heterogeneity, production system and heel–toe effect of a horizontal wellbore, and reservoir heterogeneity is the main influencing factor; (2) the horizontal–vertical ratio of the well area determines whether the gas well productivity will be affected by the risk of water invasion. The stronger the reservoir heterogeneity, the smaller the safety limit value of the horizontal–vertical ratio; (3) when the permeability differential increases gradually, the safety limit value of the transverse longitudinal ratio decreases in turn; (4) based on the relationship curve between permeability level difference and the safety limit value of the horizontal–vertical ratio in the well area, the horizontal–vertical ratio of the N1H well is far greater than the safety limit value. The well is at high risk of water invasion and should be developed by water control. In order to improve deep seabed water and gas reservoirs, water control development should be carried out in well areas with sufficient water energy and high water invasion risk. The water invasion characteristics of bottom-water gas reservoirs under different water control technologies (such as variable density screen technology, filling water blocking, breathable coated gravel technology, etc.) and production systems (periodic gas production technology) should be studied. The research results can not only judge the water invasion risk of deep seabed water and gas reservoirs under different permeability levels and gas production rates but also provide a reference for water control development of offshore and onshore bottom-water and gas reservoirs.

Suggested Citation

  • Jiqiang Zhi & Lifeng Bo & Guohui Qu & Nan Jiang & Rongzhou Zhang, 2022. "Water Invasion Law and Water Invasion Risk Identification Method for Deep Sea Bottom-Water Gas Reservoir," Energies, MDPI, vol. 15(5), pages 1-16, March.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1937-:d:765786
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    References listed on IDEAS

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    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.
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    Cited by:

    1. Qiangui Zhang & Zelin Yan & Xiangyu Fan & Zhilin Li & Pengfei Zhao & Juntian Shuai & Lichun Jia & Lu Liu, 2023. "Field Monitoring and Identification Method for Overflow of Fractured-Vuggy Carbonate Reservoir," Energies, MDPI, vol. 16(5), pages 1-15, March.

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