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Investigation of Water Composition on Formation Damage and Related Energy Recovery from Geothermal Reservoirs: Geochemical and Geomechanics Insights

Author

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  • Ilyas Khurshid

    (Department of Mechanical Engineering, College of Engineering, Khalifa University, Abu Dhabi P.O. Box 12277, United Arab Emirates)

  • Imran Afgan

    (Department of Mechanical Engineering, College of Engineering, Khalifa University, Abu Dhabi P.O. Box 12277, United Arab Emirates
    Department of MACE, School of Engineering, The University of Manchester, Manchester M13 9PL, UK)

Abstract

The main challenge in extracting geothermal energy is to overcome issues relating to geothermal reservoirs such as the formation damage and formation fracturing. The objective of this study is to develop an integrated framework that considers the geochemical and geomechanics aspects of a reservoir and characterizes various formation damages such as impairment of formation porosity and permeability, hydraulic fracturing, lowering of formation breakdown pressure, and the associated heat recovery. In this research study, various shallow, deep and high temperature geothermal reservoirs with different formation water compositions were simulated to predict the severity/challenges during water injection in hot geothermal reservoirs. The developed model solves various geochemical reactions and processes that take place during water injection in geothermal reservoirs. The results obtained were then used to investigate the geomechanics aspect of cold-water injection. Our findings presented that the formation temperature, injected water temperature, the concentration of sulfate in the injected water, and its dilution have a noticeable impact on rock dissolution and precipitation. In addition, anhydrite precipitation has a controlling effect on permeability impairment in the investigated case study. It was observed that the dilution of water could decrease formation of scale while the injection of sulfate rich water could intensify scale precipitation. Thus, the reservoir permeability could decrease to a critical level, where the production of hot water reduces and the generation of geothermal energy no longer remains economical. It evident that injection of incompatible water would decrease the formation porosity. Thus, the geomechanics investigation was performed to determine the effect of porosity decrease. It was found that for the 50% porosity reduction case, the initial formation breakdown pressure reduced from 2588 psi to 2586 psi, and for the 75% porosity reduction case it decreased to 2584 psi. Thus, geochemical based formation damage is significant but geomechanics based formation fracturing is insignificant in the selected case study. We propose that water composition should be designed to minimize damage and that high water injection pressures in shallow reservoirs should be avoided.

Suggested Citation

  • Ilyas Khurshid & Imran Afgan, 2021. "Investigation of Water Composition on Formation Damage and Related Energy Recovery from Geothermal Reservoirs: Geochemical and Geomechanics Insights," Energies, MDPI, vol. 14(21), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7415-:d:674122
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    References listed on IDEAS

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    1. Melikoglu, Mehmet, 2017. "Geothermal energy in Turkey and around the World: A review of the literature and an analysis based on Turkey's Vision 2023 energy targets," Renewable and Sustainable Energy Reviews, Elsevier, vol. 76(C), pages 485-492.
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    3. Vakulchuk, Roman & Overland, Indra & Scholten, Daniel, 2020. "Renewable energy and geopolitics: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 122(C).
    4. Chamorro, César R. & Mondéjar, María E. & Ramos, Roberto & Segovia, José J. & Martín, María C. & Villamañán, Miguel A., 2012. "World geothermal power production status: Energy, environmental and economic study of high enthalpy technologies," Energy, Elsevier, vol. 42(1), pages 10-18.
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    1. Ilyas Khurshid & Imran Afgan, 2021. "Geochemical Investigation of CO 2 Injection in Oil and Gas Reservoirs of Middle East to Estimate the Formation Damage and Related Oil Recovery," Energies, MDPI, vol. 14(22), pages 1-16, November.
    2. Shugang Li & Lidong Liu & Pengxiang Zhao & Yongyong Jia & Haifei Lin, 2023. "Fractal Characteristics of the Low-Gas Permeability Area of a Fully Mechanized Up-Dip Working Face under Different Dip Angles of Rock Strata," Energies, MDPI, vol. 16(20), pages 1-19, October.

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