Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs

Yasaman Assef, Pedro Pereira Almao, Peyman Pourafshary

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

Abstract

Dependency of relative permeability on saturation path during cyclic CO 2 injection (CCI) in various operational constraints affects the oil recovery in different ways. A compositional reservoir sector model is built based on the available production data of hydraulically fractured horizontal well in Bakken formation. The work discusses the simulation results of the CCI and investigates the contributions of non-wetting phase's relative permeability hysteresis in oil production below and above the minimum miscibility pressure (MMP). A CMG-GEM model is built based on the Bakken geological settings, well production and live oil PVT data. Relative permeability hysteresis model is incorporated within the simulator using the Killough's method. A cyclic CO 2 injection (CCI) EOR scheme is designed and implemented in the numerical model. Effects of structural trapping and hysteresis-induced CO 2 /gas retardation on oil recovery are studied during CCI in which a strong flow reversals may occur. The results of simulation revealed that in non-hysteretic model, performing cyclic CO 2 injection at immiscible (2000psi) and miscible (5000psi) conditions increases the recovery up to 12.8% and 22.64% respectively. Recovered oil after inclusion of relative permeability hysteresis demonstrate major corresponding effects of gas retardation, CO 2 trapping and improved water permeability. The results show mole fraction of CO 2 invading the reservoir remains constant at miscible condition and is not affected by hysteresis. Yet in hysteretic model, the oil recovery factor is slightly declined as the relative permeability to water is improved. The immiscible-hysteretic model incorporates high residual gas/ CO 2 gas saturation at the end of each production (imbibition) cycle which increases gradually with historical gas saturation. CO 2 mole fractions in both gas and oil phases are intensely decreased due to hysteresis following by decline in CO 2 injectivity. Residual CO 2 trapped during early cycles, limits the CO 2 extent in reservoir and makes the recovery less efficient. In addition to residual saturation, oil composition varies due to different rates of vaporization and diffusion by CO 2 as a result of its uneven distribution in reservoir. We accurately evaluated the efficiency of cyclic CO 2 injection in to Bakken tight oil reservoir by incorporating gas-trapping mechanisms in the model. Shortcomings of uncertainties associated with the previous simplified non-hysteretic reservoir models is reduced. Various operational conditions are tested. Our results draw a distinction amongst underlying mechanisms of recovery induced by hysteresis at different miscibility conditions.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613996324
Publication statusPublished - Jan 1 2019
EventAbu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018 - Abu Dhabi, United Arab Emirates
Duration: Nov 12 2018Nov 15 2018

Publication series

NameSociety of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018

Conference

ConferenceAbu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018
CountryUnited Arab Emirates
CityAbu Dhabi
Period11/12/1811/15/18

Fingerprint

Carbon Monoxide
hysteresis
Oils
Solubility
Hysteresis
oil
permeability
Recovery
gas
Gases
saturation
trapping
well
imbibition
effect
miscibility
Air cushion vehicles
vaporization
Horizontal wells
oil production

Keywords

  • Cyclic CO injection
  • Hydraulically-fractured horizontal well
  • Relative permeability hysteresis

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology

Cite this

Assef, Y., Pereira Almao, P., & Pourafshary, P. (2019). Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs. In Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018 (Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018). Society of Petroleum Engineers.

Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs. / Assef, Yasaman; Pereira Almao, Pedro; Pourafshary, Peyman.

Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers, 2019. (Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018).

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

Assef, Y, Pereira Almao, P & Pourafshary, P 2019, Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs. in Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018, Society of Petroleum Engineers, Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018, Abu Dhabi, United Arab Emirates, 11/12/18.
Assef Y, Pereira Almao P, Pourafshary P. Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs. In Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers. 2019. (Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018).
Assef, Yasaman ; Pereira Almao, Pedro ; Pourafshary, Peyman. / Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs. Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018. Society of Petroleum Engineers, 2019. (Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018).
@inproceedings{65e1fff3f81d45d1817ab6e513332b9f,
title = "Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs",
abstract = "Dependency of relative permeability on saturation path during cyclic CO 2 injection (CCI) in various operational constraints affects the oil recovery in different ways. A compositional reservoir sector model is built based on the available production data of hydraulically fractured horizontal well in Bakken formation. The work discusses the simulation results of the CCI and investigates the contributions of non-wetting phase's relative permeability hysteresis in oil production below and above the minimum miscibility pressure (MMP). A CMG-GEM model is built based on the Bakken geological settings, well production and live oil PVT data. Relative permeability hysteresis model is incorporated within the simulator using the Killough's method. A cyclic CO 2 injection (CCI) EOR scheme is designed and implemented in the numerical model. Effects of structural trapping and hysteresis-induced CO 2 /gas retardation on oil recovery are studied during CCI in which a strong flow reversals may occur. The results of simulation revealed that in non-hysteretic model, performing cyclic CO 2 injection at immiscible (2000psi) and miscible (5000psi) conditions increases the recovery up to 12.8{\%} and 22.64{\%} respectively. Recovered oil after inclusion of relative permeability hysteresis demonstrate major corresponding effects of gas retardation, CO 2 trapping and improved water permeability. The results show mole fraction of CO 2 invading the reservoir remains constant at miscible condition and is not affected by hysteresis. Yet in hysteretic model, the oil recovery factor is slightly declined as the relative permeability to water is improved. The immiscible-hysteretic model incorporates high residual gas/ CO 2 gas saturation at the end of each production (imbibition) cycle which increases gradually with historical gas saturation. CO 2 mole fractions in both gas and oil phases are intensely decreased due to hysteresis following by decline in CO 2 injectivity. Residual CO 2 trapped during early cycles, limits the CO 2 extent in reservoir and makes the recovery less efficient. In addition to residual saturation, oil composition varies due to different rates of vaporization and diffusion by CO 2 as a result of its uneven distribution in reservoir. We accurately evaluated the efficiency of cyclic CO 2 injection in to Bakken tight oil reservoir by incorporating gas-trapping mechanisms in the model. Shortcomings of uncertainties associated with the previous simplified non-hysteretic reservoir models is reduced. Various operational conditions are tested. Our results draw a distinction amongst underlying mechanisms of recovery induced by hysteresis at different miscibility conditions.",
keywords = "Cyclic CO injection, Hydraulically-fractured horizontal well, Relative permeability hysteresis",
author = "Yasaman Assef and {Pereira Almao}, Pedro and Peyman Pourafshary",
year = "2019",
month = "1",
day = "1",
language = "English",
series = "Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018",
publisher = "Society of Petroleum Engineers",
booktitle = "Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018",

}

TY - GEN

T1 - Miscibility effects on performance of cyclic CO 2 injection in hysteretic tight oil reservoirs

AU - Assef, Yasaman

AU - Pereira Almao, Pedro

AU - Pourafshary, Peyman

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Dependency of relative permeability on saturation path during cyclic CO 2 injection (CCI) in various operational constraints affects the oil recovery in different ways. A compositional reservoir sector model is built based on the available production data of hydraulically fractured horizontal well in Bakken formation. The work discusses the simulation results of the CCI and investigates the contributions of non-wetting phase's relative permeability hysteresis in oil production below and above the minimum miscibility pressure (MMP). A CMG-GEM model is built based on the Bakken geological settings, well production and live oil PVT data. Relative permeability hysteresis model is incorporated within the simulator using the Killough's method. A cyclic CO 2 injection (CCI) EOR scheme is designed and implemented in the numerical model. Effects of structural trapping and hysteresis-induced CO 2 /gas retardation on oil recovery are studied during CCI in which a strong flow reversals may occur. The results of simulation revealed that in non-hysteretic model, performing cyclic CO 2 injection at immiscible (2000psi) and miscible (5000psi) conditions increases the recovery up to 12.8% and 22.64% respectively. Recovered oil after inclusion of relative permeability hysteresis demonstrate major corresponding effects of gas retardation, CO 2 trapping and improved water permeability. The results show mole fraction of CO 2 invading the reservoir remains constant at miscible condition and is not affected by hysteresis. Yet in hysteretic model, the oil recovery factor is slightly declined as the relative permeability to water is improved. The immiscible-hysteretic model incorporates high residual gas/ CO 2 gas saturation at the end of each production (imbibition) cycle which increases gradually with historical gas saturation. CO 2 mole fractions in both gas and oil phases are intensely decreased due to hysteresis following by decline in CO 2 injectivity. Residual CO 2 trapped during early cycles, limits the CO 2 extent in reservoir and makes the recovery less efficient. In addition to residual saturation, oil composition varies due to different rates of vaporization and diffusion by CO 2 as a result of its uneven distribution in reservoir. We accurately evaluated the efficiency of cyclic CO 2 injection in to Bakken tight oil reservoir by incorporating gas-trapping mechanisms in the model. Shortcomings of uncertainties associated with the previous simplified non-hysteretic reservoir models is reduced. Various operational conditions are tested. Our results draw a distinction amongst underlying mechanisms of recovery induced by hysteresis at different miscibility conditions.

AB - Dependency of relative permeability on saturation path during cyclic CO 2 injection (CCI) in various operational constraints affects the oil recovery in different ways. A compositional reservoir sector model is built based on the available production data of hydraulically fractured horizontal well in Bakken formation. The work discusses the simulation results of the CCI and investigates the contributions of non-wetting phase's relative permeability hysteresis in oil production below and above the minimum miscibility pressure (MMP). A CMG-GEM model is built based on the Bakken geological settings, well production and live oil PVT data. Relative permeability hysteresis model is incorporated within the simulator using the Killough's method. A cyclic CO 2 injection (CCI) EOR scheme is designed and implemented in the numerical model. Effects of structural trapping and hysteresis-induced CO 2 /gas retardation on oil recovery are studied during CCI in which a strong flow reversals may occur. The results of simulation revealed that in non-hysteretic model, performing cyclic CO 2 injection at immiscible (2000psi) and miscible (5000psi) conditions increases the recovery up to 12.8% and 22.64% respectively. Recovered oil after inclusion of relative permeability hysteresis demonstrate major corresponding effects of gas retardation, CO 2 trapping and improved water permeability. The results show mole fraction of CO 2 invading the reservoir remains constant at miscible condition and is not affected by hysteresis. Yet in hysteretic model, the oil recovery factor is slightly declined as the relative permeability to water is improved. The immiscible-hysteretic model incorporates high residual gas/ CO 2 gas saturation at the end of each production (imbibition) cycle which increases gradually with historical gas saturation. CO 2 mole fractions in both gas and oil phases are intensely decreased due to hysteresis following by decline in CO 2 injectivity. Residual CO 2 trapped during early cycles, limits the CO 2 extent in reservoir and makes the recovery less efficient. In addition to residual saturation, oil composition varies due to different rates of vaporization and diffusion by CO 2 as a result of its uneven distribution in reservoir. We accurately evaluated the efficiency of cyclic CO 2 injection in to Bakken tight oil reservoir by incorporating gas-trapping mechanisms in the model. Shortcomings of uncertainties associated with the previous simplified non-hysteretic reservoir models is reduced. Various operational conditions are tested. Our results draw a distinction amongst underlying mechanisms of recovery induced by hysteresis at different miscibility conditions.

KW - Cyclic CO injection

KW - Hydraulically-fractured horizontal well

KW - Relative permeability hysteresis

UR - http://www.scopus.com/inward/record.url?scp=85063116533&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063116533&partnerID=8YFLogxK

M3 - Conference contribution

T3 - Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018

BT - Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2018, ADIPEC 2018

PB - Society of Petroleum Engineers

ER -