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Flowing Material Balance and Rate-Transient Analysis of Horizontal Wells in Under-Saturated Coal Seam Gas Reservoirs: A Case Study from the Qinshui Basin, China

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  • Suyang Zhu

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

  • Alireza Salmachi

    (Australian School of Petroleum and Energy Resources, University of Adelaide, Adelaide 5005, Australia)

Abstract

Two phase flow and horizontal well completion pose additional challenges for rate-transient analysis (RTA) techniques in under-saturated coal seam gas (CSG) reservoirs. To better obtain reservoir parameters, a practical workflow for the two phase RTA technique is presented to extract reservoir information by the analysis of production data of a horizontal well in an under-saturated CSG reservoir. This workflow includes a flowing material balance (FMB) technique and an improved form of two phase (water + gas) RTA. At production stage of a horizontal well in under-saturated CSG reservoirs, a FMB technique was developed to extract original water in-place (OWIP) and horizontal permeability. This FMB technique involves the application of an appropriate productivity equation representing the relative position of the horizontal well in the drainage area. Then, two phase (water + gas) RTA of a horizontal well was also investigated by introducing the concept of the area of influence (AI), which enables the calculation of the water saturation during the transient formation linear flow. Finally, simulation and field examples are presented to validate and demonstrate the application of the proposed techniques. Simulation results indicate that the proposed FMB technique accurately predicts OWIP and coal permeability when an appropriate productivity equation is selected. The field application of the proposed methods is demonstrated by analysis of production data of a horizontal CSG well in the Qinshui Basin, China.

Suggested Citation

  • Suyang Zhu & Alireza Salmachi, 2021. "Flowing Material Balance and Rate-Transient Analysis of Horizontal Wells in Under-Saturated Coal Seam Gas Reservoirs: A Case Study from the Qinshui Basin, China," Energies, MDPI, vol. 14(16), pages 1-24, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4887-:d:611784
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    References listed on IDEAS

    as
    1. Alireza Salmachi & Mojtaba Rajabi & Carmine Wainman & Steven Mackie & Peter McCabe & Bronwyn Camac & Christopher Clarkson, 2021. "History, Geology, In Situ Stress Pattern, Gas Content and Permeability of Coal Seam Gas Basins in Australia: A Review," Energies, MDPI, vol. 14(9), pages 1-37, May.
    2. 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.
    3. Jiyuan Zhang & Bin Zhang & Shiqian Xu & Qihong Feng & Xianmin Zhang & Derek Elsworth, 2021. "Interpretation of Gas/Water Relative Permeability of Coal Using the Hybrid Bayesian-Assisted History Matching: New Insights," Energies, MDPI, vol. 14(3), pages 1-19, January.
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    Cited by:

    1. Qingzhong Zhu & Yanhui Yang & Xueying Zhang & Sanshuai Wang & Jinzhao Yang & Jiyuan Zhang, 2022. "Pore-Scale Simulation of Gas and Water Two-Phase Flow in Rough-Walled Fractures Using the Volume of Fluid Method," Energies, MDPI, vol. 15(24), pages 1-15, December.

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