Condensate recovery from tight gas-condensate reservoirs using a new method based on a gas-based chemical

Abdulelah Nasieef, Mahmoud Jamiolahmady, Hosein Doryanidaryuni, Alejandro Restrepo, Alonso Ocampo, Toushar Chakrabarty, Ifeanyi Seteyeobot

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

Abstract

Recovery from gas condensate reservoirs, when the pressure is below dew point pressure (Pdew), is adversely affected by the accumulation of condensate in the near wellbore region. The mitigation of the near-well bore condensate banking is the main purpose of any enhanced recovery method implemented in gas condensate reservoirs. In this work, a new method was tested to improve condensate recovery by using a chemical that was delivered using hydrocarbon gas as a carrier into a very low permeability and very low porosity reservoir rock. Chemicals are typically injected using liquid carrier solvents. The use of hydrocarbon gas as the carrier provides a remedy to mitigate condensate banking in very low permeability cores by minimizing complications associated with low injectivity and back flow clean-up process requirements of an injected liquid. The chemical potential was evaluated by recording production data from unsteady-state coreflood experiments. The injection of the chemical with equilibrated gas resulted in condensate saturation to decrease from 19.6% to 6.5%. This decrease was not instantaneous and took some time to occur indicating that the chemical needs time to interact with the resident fluid and rock. The benefit of the method, at the field scale, was also estimated by performing single-well numerical simulations that use relative permeability (kr) data which history matched the measured coreflood production data. The results of these preliminary simulations also showed improved recovery of gas and condensate compared to pure depletion, without chemical, by around 40% for the cases considered.

Original languageEnglish
Title of host publicationSPE Annual Technical Conference and Exhibition 2021
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613997864
DOIs
Publication statusPublished - 15 Sep 2021
EventSPE Annual Technical Conference and Exhibition 2021 - Dubai, United Arab Emirates
Duration: 21 Sep 202123 Sep 2021

Conference

ConferenceSPE Annual Technical Conference and Exhibition 2021
Abbreviated titleATCE 2021
Country/TerritoryUnited Arab Emirates
CityDubai
Period21/09/2123/09/21

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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