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Experiments on Water-Gas Flow Characteristics under Reservoir Condition in a Sandstone Gas Reservoir

Author

Listed:
  • Yilong Li

    (State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Hao Yang

    (State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Xiaoping Li

    (State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Mingqing Kui

    (PetroChina Qinhai Oilfield Company, Dunhuang 736202, China)

  • Jiqiang Zhang

    (Hainan Branch of CNOOC China Ltd., Haikou 570105, China)

Abstract

For gas reservoirs that contain water, investigating characteristics of water–gas seepage is crucial to the formulation of gas field development plans and predicting the production capacity and water breakthrough of gas wells. For the purposes of such an investigation, the process of water invasion into a water-containing gas reservoir was studied based on four sandstone samples whose physical properties differed quite vastly (permeability: 0.112–192.251 mD; porosity: 8.33–20.60%). Gas–water relative permeability experiments were conducted on the gas-driven water in the reservoir conditions (temperature: 135 °C; pressure: 75 MPa). Starting with the sandstone samples’ microstructural characteristics, particular attention was paid to the impacts of throat radius and clay content on the water–gas seepage characteristics. It was found that the basic physical properties, microscopic characteristics, and mineral composition of the sandstone samples all affected the water–gas seepage characteristics. The larger the pore-throat radius, the stronger the ability of sandstone samples to allow fluid through under the same water saturation and the greater the relative permeability of gas and water phases. Furthermore, the wider the throat radius and the lower the clay content, the greater the gas–water relative permeability. Isotonic water saturation and irreducible water saturation were found to be negatively to throat radius and positively with clay content. Furthermore, When sandstone samples have similar clay content, the average throat radius is four times larger, its irreducible water saturation is decreased by 1.63%, its residual gas saturation is decreased by 1.00%, and the gas permeability under irreducible water saturation increases by more than 400 times. Water intrusion showed a more significant impact on the gas–water flow characteristics of the low-permeability sandstone samples, and it severely restricted the flow capacity of the gas phase.

Suggested Citation

  • Yilong Li & Hao Yang & Xiaoping Li & Mingqing Kui & Jiqiang Zhang, 2022. "Experiments on Water-Gas Flow Characteristics under Reservoir Condition in a Sandstone Gas Reservoir," Energies, MDPI, vol. 16(1), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:36-:d:1009494
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    References listed on IDEAS

    as
    1. X.-H. Tan & C.-Y. Liu & X.-P. Li & H.-Q. Wang & H. Deng, 2018. "A stress sensitivity model for the permeability of porous media based on bi-dispersed fractal theory," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 29(02), pages 1-12, February.
    2. Pål Østebø Andersen & Liva Salomonsen & Dagfinn Søndenaa Sleveland, 2022. "Characteristic Forced and Spontaneous Imbibition Behavior in Strongly Water-Wet Sandstones Based on Experiments and Simulation," Energies, MDPI, vol. 15(10), pages 1-26, May.
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