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Mitigation of Condensate Banking Using Thermochemical Treatment: Experimental and Analytical Study

Author

Listed:
  • Amjed M. Hassan

    (College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia)

  • Mohamed A. Mahmoud

    (College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia)

  • Abdulaziz A. Al-Majed

    (College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia)

  • Ayman R. Al-Nakhli

    (Saudi Aramco, Dhahran 31311, Saudi Arabia)

  • Mohammed A. Bataweel

    (Saudi Aramco, Dhahran 31311, Saudi Arabia)

  • Salaheldin Elkatatny

    (College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia)

Abstract

Condensate banking is a common problem in tight gas reservoirs because it diminishes the gas relative permeability and reduces the gas production rate significantly. CO 2 injection is a common and very effective solution to mitigate the condensate damage around the borehole in tight gas reservoirs. The problem with CO 2 injection is that it is a temporary solution and has to be repeated frequently in the field in addition to the supply limitations of CO 2 in some areas. In addition, the infrastructure required at the surface to handle CO 2 injection makes it expensive to apply CO 2 injection for condensate removal. In this paper, a new permanent technique is introduced to remove the condensate by using a thermochemical technique. Two chemicals will be used to generate in situ CO 2 , nitrogen, steam, heat, and pressure. The reaction of the two chemicals downhole can be triggered either by the reservoir temperature or a chemical activator. Two chemicals will start reacting and produce all the mentioned reaction products after 24 h of mixing and injection. In addition, the reaction can be triggered by a chemical activator and this will shorten the time of reaction. Coreflooding experiments were carried out using actual condensate samples from one of the gas fields. Tight sandstone cores of 0.9 mD permeability were used. The results of this study showed that the thermochemical reaction products removed the condensate and reduced its viscosity due to the high temperature and the generated gases. The novelty in this paper is the creation of micro-fractures in the tight rock sample due to the in-situ generation of heat and pressure. These micro-fractures reduced the capillary forces that hold the condensate and enhanced the rock relative permeability. The creation of micro-fractures and in turn the reduction of the capillary forces can be considered as permanent condensate removal.

Suggested Citation

  • Amjed M. Hassan & Mohamed A. Mahmoud & Abdulaziz A. Al-Majed & Ayman R. Al-Nakhli & Mohammed A. Bataweel & Salaheldin Elkatatny, 2019. "Mitigation of Condensate Banking Using Thermochemical Treatment: Experimental and Analytical Study," Energies, MDPI, vol. 12(5), pages 1-12, February.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:800-:d:209788
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    References listed on IDEAS

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    2. Daobing Wang & Fang Shi & Bo Yu & Dongliang Sun & Xiuhui Li & Dongxu Han & Yanxin Tan, 2018. "A Numerical Study on the Diversion Mechanisms of Fracture Networks in Tight Reservoirs with Frictional Natural Fractures," Energies, MDPI, vol. 11(11), pages 1-28, November.
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    1. Amjed M. Hassan & Mohamed A. Mahmoud & Abdulaziz A. Al-Majed & Dhafer Al-Shehri & Ayman R. Al-Nakhli & Mohammed A. Bataweel, 2019. "Gas Production from Gas Condensate Reservoirs Using Sustainable Environmentally Friendly Chemicals," Sustainability, MDPI, vol. 11(10), pages 1-15, May.

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