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Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Author

Listed:
  • Guoqiang Xing

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, Ministry of Science and Technology, Beijing 100083, China)

  • Mingxian Wang

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China)

  • Shuhong Wu

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, Ministry of Science and Technology, Beijing 100083, China)

  • Hua Li

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, Ministry of Science and Technology, Beijing 100083, China)

  • Jiangyan Dong

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, Ministry of Science and Technology, Beijing 100083, China)

  • Wenqi Zhao

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China)

Abstract

Many oil wells in closed reservoirs continue to produce in the pseudo-steady-state flow regime for a long time. The principal objective of this work is to investigate the characteristics of two key pseudo-steady-state parameters—pseudo-steady-state constant ( b Dpss ) and pseudo-skin factor (S)—for a well penetrated by a fracture with an azimuth angle ( θ ) in an anisotropic reservoir. Firstly, a general analytical pressure solution for a finite-conductivity fracture with or without an azimuth angle in an anisotropic rectangular reservoir was developed by using the point-source function and spatial integral method, and two typical cases were employed to verify this solution. Secondly, with the asymptotic analysis method, the expressions of pseudo-steady-state constant and pseudo-skin factor were obtained on the basis of their definitions, and the effects of permeability anisotropy, fracture azimuth angle, fracture conductivity and reservoir shape on them were discussed in detail. Results show that all the b Dpss - θ and S- θ curves are symmetric around the vertical line, θ = 90° and form a hump or groove shape. The optimized fracture direction in an anisotropic reservoir is perpendicular to the principal permeability axis. Furthermore, a new formula to calculate pseudo-skin factor was successfully proposed based on these two parameters’ relationship. Finally, as an application of pseudo-steady-state constant, a set of Blasingame format rate decline curves for the proposed model were established.

Suggested Citation

  • Guoqiang Xing & Mingxian Wang & Shuhong Wu & Hua Li & Jiangyan Dong & Wenqi Zhao, 2019. "Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir," Energies, MDPI, vol. 12(12), pages 1-27, June.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2449-:d:242829
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    References listed on IDEAS

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    1. Mingxian Wang & Zifei Fan & Guoqiang Xing & Wenqi Zhao & Heng Song & Penghui Su, 2018. "Rate Decline Analysis for Modeling Volume Fractured Well Production in Naturally Fractured Reservoirs," Energies, MDPI, vol. 11(1), pages 1-21, January.
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    Cited by:

    1. Qing Tian & Yudong Cui & Wanjing Luo & Pengcheng Liu & Bo Ning, 2020. "Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs," Energies, MDPI, vol. 13(6), pages 1-20, March.
    2. Mingxian Wang & Xiangji Dou & Ruiqing Ming & Weiqiang Li & Wenqi Zhao & Chengqian Tan, 2021. "Semi-Analytical Rate Decline Solutions for a Refractured Horizontal Well Intercepted by Multiple Reorientation Fractures with Fracture Face Damage in an Anisotropic Tight Reservoir," Energies, MDPI, vol. 14(22), pages 1-28, November.

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