Mahzari, P;
Jones, AP;
Oelkers, EH;
(2020)
Impact of in-situ gas liberation for enhanced oil recovery and CO₂ storage in liquid-rich shale reservoirs.
Energy Sources Part A: Recovery, Utilization, and Environmental Effects
10.1080/15567036.2020.1815907.
(In press).
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Abstract
Carbon dioxide injection in shale reservoirs can be beneficial for enhanced oil recovery and CO2 storage scenarios. CO2 mass transfer can be influenced strongly by the in-situ liberation of light oil components from live oil forming a distinct gas phase. This mechanism has been overlooked in the past for studying CO2 and oil interactions in tight formations. In this work, a series of analytical solutions and numerical simulations were developed to identify the effect on EOR by CO2 due to the liberation of a light hydrocarbon gas phase from live oil in shales. The analytical model demonstrated faster diffusion of CO2 in the two-phase system due to the presence of this gas phase. Using numerical approaches, laboratory-scale simulations indicated that in-situ gas formation can increase oil recovery by 35%. At the field-scale, an additional oil recovery of 9.8% could be attained. Also, the CO2 storage capacity of shale formations could be significantly enhanced due to capillary trapping of CO2 in the liberated gas. The results of this study could potentially be used to improve evaluations of the potential of CO2 EOR in shale reservoirs.
| Type: | Article |
|---|---|
| Title: | Impact of in-situ gas liberation for enhanced oil recovery and CO₂ storage in liquid-rich shale reservoirs |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/15567036.2020.1815907 |
| Publisher version: | https://doi.org/10.1080/15567036.2020.1815907 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Enhanced oil recovery, CO2 storage, shale oil, CO2 injection, huff-n-puff, phase behavior, simulation, unconventionals |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10116281 |
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