CO2-based heavy oil recovery processes for post-CHOPS reservoirs

Amin Sharifi Haddad, Ian Gates (Corresponding Author)

Research output: Contribution to journalArticle

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4 Downloads (Pure)

Abstract

Cold Heavy Oil Production with Sand (CHOPS) is currently the process of choice for recovery from unconsolidated solution-gas rich heavy oil reservoirs. Compared to waterflood and thermal recovery processes, primary processes such as CHOPS have relatively low energy and emission intensities; in other words, they can be considered as relatively ‘clean’ fossil fuel energy recovery processes. However, with recovery factors between 5 and 15% at the end of its economic life, there is a search for follow-up processes that yield additional oil from these reservoirs with continued low energy and emission intensities. One option is CO2-based enhanced oil recovery (EOR) processes – CO2 can lower oil viscosity and if some fraction of the injected CO2 is sequestered in the reservoir, then the process can be considered a CO2 storage process in addition to an oil follow-up recovery process. Here, we evaluate the energy return and CO2 sequestered in cyclic CO2 and cyclic CO2-hot water injection processes in a post-CHOPS heavy oil field. The results reveal that overall recovery factors can be raised through appropriate design of the CO2 follow-up process. Cyclic CO2 injection achieves an incremental 2.4% recovery factor (over 4 years of operation) with high energy return ratio whereas CO2-hot water processes achieve higher recovery factors with lower energy return ratios. In these processes, the amount of CO2 that remains sequestered in the reservoir is small, typically less than 5%. Thus, these EOR processes are not strong candidates for CO2 sequestration.
Original languageEnglish
Pages (from-to)238-246
Number of pages9
JournalJournal of CO2 Utilization
Volume19
Early online date15 Apr 2017
DOIs
Publication statusPublished - May 2017

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Heavy oil production
Petroleum reservoirs
heavy oil
oil production
Sand
Crude oil
Recovery
sand
Oils
enhanced oil recovery
energy
oil
cold
carbon sequestration
oil field
fossil fuel
Water injection
viscosity
Oil fields
Fossil fuels

Keywords

  • heavy oil
  • cold production of heavy oil with sand
  • post-CHOPS
  • CO2 injection
  • follow-up recovery processes

Cite this

CO2-based heavy oil recovery processes for post-CHOPS reservoirs. / Sharifi Haddad, Amin; Gates, Ian (Corresponding Author).

In: Journal of CO2 Utilization, Vol. 19, 05.2017, p. 238-246.

Research output: Contribution to journalArticle

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abstract = "Cold Heavy Oil Production with Sand (CHOPS) is currently the process of choice for recovery from unconsolidated solution-gas rich heavy oil reservoirs. Compared to waterflood and thermal recovery processes, primary processes such as CHOPS have relatively low energy and emission intensities; in other words, they can be considered as relatively ‘clean’ fossil fuel energy recovery processes. However, with recovery factors between 5 and 15{\%} at the end of its economic life, there is a search for follow-up processes that yield additional oil from these reservoirs with continued low energy and emission intensities. One option is CO2-based enhanced oil recovery (EOR) processes – CO2 can lower oil viscosity and if some fraction of the injected CO2 is sequestered in the reservoir, then the process can be considered a CO2 storage process in addition to an oil follow-up recovery process. Here, we evaluate the energy return and CO2 sequestered in cyclic CO2 and cyclic CO2-hot water injection processes in a post-CHOPS heavy oil field. The results reveal that overall recovery factors can be raised through appropriate design of the CO2 follow-up process. Cyclic CO2 injection achieves an incremental 2.4{\%} recovery factor (over 4 years of operation) with high energy return ratio whereas CO2-hot water processes achieve higher recovery factors with lower energy return ratios. In these processes, the amount of CO2 that remains sequestered in the reservoir is small, typically less than 5{\%}. Thus, these EOR processes are not strong candidates for CO2 sequestration.",
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