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Research on Transformation of Connate Water to Movable Water in Water-Bearing Tight Gas Reservoirs

Author

Listed:
  • Fuhu Chen

    (Petroleum Engineering Technology Research Institute, SINOPEC North China Oil & Gas Company, Zhengzhou 450000, China)

  • Zengding Wang

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Shuaishi Fu

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Aifen Li

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Junjie Zhong

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

The Dongsheng gas field is a water-bearing tight gas reservoir characterized by high connate water saturation. During gas production, the transformation of connate water into movable water introduces a unique water production mode, significantly impacting gas reservoir recovery. Current experimental and theoretical methods for assessing formation water mobility are static and do not address the transformation mechanism from connate into movable water. In this study, we considered dynamic changes in formation stress and proposed the mechanism for the transformation of connate water into movable water during depressurization, involving the expansion of connate water films and the reduction of pore volume. We developed a novel methodology to calculate the dynamic changes in movable and connate water saturation in tight reservoirs due to reservoir pressure reduction. Furthermore, we quantitatively evaluated the transformation of connate water into movable water in the Dongsheng gas field through laboratory experiments (including formation water expansion tests, connate water tests, and porosity stress sensitivity tests) and theoretical calculations. Results show that under original stress, the initial connate water saturation in the Dongsheng gas field ranges from 50.09% to 58.5%. As reservoir pressure decreases, the maximum increase in movable water saturation ranges from 6.1% to 8.4% due to the transformation of connate water into movable water. This explains why formation water is produced in large quantities during gas production. Therefore, considering the transition of connate water to movable water is crucial when evaluating water production risk. These findings offer valuable guidance for selecting optimal well locations and development layers to reduce reservoir water production risks.

Suggested Citation

  • Fuhu Chen & Zengding Wang & Shuaishi Fu & Aifen Li & Junjie Zhong, 2023. "Research on Transformation of Connate Water to Movable Water in Water-Bearing Tight Gas Reservoirs," Energies, MDPI, vol. 16(19), pages 1-13, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6961-:d:1254122
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    References listed on IDEAS

    as
    1. Ren Wang & Kai Liu & Wanzhong Shi & Shuo Qin & Wei Zhang & Rong Qi & Litao Xu, 2022. "Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China," Energies, MDPI, vol. 15(6), pages 1-21, March.
    2. Xinling Hu & Jian Wang & Liang Zhang & Hongli Xiong & Zengding Wang & Huazheng Duan & Jun Yao & Hai Sun & Lei Zhang & Wenhui Song & Junjie Zhong, 2022. "Direct Visualization of Nanoscale Salt Precipitation and Dissolution Dynamics during CO 2 Injection," Energies, MDPI, vol. 15(24), pages 1-14, December.
    3. Mianmo Meng & Yinghao Shen & Hongkui Ge & Xiaosong Xu & Yang Wu, 2020. "The Effect of Fracturing Fluid Saturation on Natural Gas Flow Behavior in Tight Reservoirs," Energies, MDPI, vol. 13(20), pages 1-15, October.
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