A black-oil approach to model produced gas injection for enhanced recovery of conventional and unconventional reservoirs

Fengshuang Du, Bahareh Nojabaei, Russell T. Johns

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

In this study, a fast and robust compositionally extended black-oil simulation approach is developed, which is capable of including the effect of large gas-oil capillary pressure for first and multi-contact miscible, and immiscible gas injection. The simulation approach is used to model primary depletion and gas flooding in a high-permeability reservoir using a five-spot flow pattern for different reservoir pressures. The comparison with fully-compositional model shows good agreement. For an initially undersaturated reservoir with both injection and production wells pressures above the original bubble-point pressure, gas evolves near the injection well and it later breaks through the production well as produced gas is injected. Additionally, the primary depletion and huff-n-puff gas injection in tight shale reservoirs by using the compositionally extended black-oil model indicates that the effect of large gas-oil capillary pressure on recovery becomes smaller as reservoir pressure is higher. Finally, a dynamic gas-oil relative permeability correlation that accounts for the compositional changes owing to the produced gas injection is introduced and applied, and its effect on oil recovery is examined.

Original languageEnglish (US)
Title of host publicationSPE Annual Technical Conference and Exhibition 2018, ATCE 2018
PublisherSociety of Petroleum Engineers (SPE)
ISBN (Electronic)9781613995723
StatePublished - Jan 1 2018
EventSPE Annual Technical Conference and Exhibition 2018, ATCE 2018 - Dallas, United States
Duration: Sep 24 2018Sep 26 2018

Publication series

NameProceedings - SPE Annual Technical Conference and Exhibition
Volume2018-September

Other

OtherSPE Annual Technical Conference and Exhibition 2018, ATCE 2018
CountryUnited States
CityDallas
Period9/24/189/26/18

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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  • Cite this

    Du, F., Nojabaei, B., & Johns, R. T. (2018). A black-oil approach to model produced gas injection for enhanced recovery of conventional and unconventional reservoirs. In SPE Annual Technical Conference and Exhibition 2018, ATCE 2018 (Proceedings - SPE Annual Technical Conference and Exhibition; Vol. 2018-September). Society of Petroleum Engineers (SPE).