Effect of miscibility and injection rate on water-saturated CO2 Injection

Emmanuel Ajoma, Saira,, Thanarat Sungkachart and Furqan Le-Hussain

Energy, 2021, vol. 217, issue C

Abstract: Water-saturated CO2 (wsCO2) injection into oil reservoirs has recently been proposed to provide better oil recovery and CO2 storage than can be obtained by pure CO2 injection. However, the interaction of wsCO2 with oil under different miscibility conditions and injection rates has not been investigated. We inject wsCO2 and pure CO2 at a "low rate" of 0.5 cc/min (to simulate gravity dominance) into Bentheimer sandstone cores at 70°C and at three pressures:14.5 MPa (2100 psia), 11.7 MPa (1700 psia), and 9.0 MPa (1300 psia) to represent miscibility, near-miscibility, and immiscibility, respectively. At near-miscibility, we also inject these fluids at a "high rate" of 2.5 cc/min in order to simulate gravity-viscous transition. The oil phase consists of a mixture of 0.65 hexane and 0.35 decane by molar fraction.

Keywords: Water-saturated CO2 (wsCO2) injection; CO2-EOR; Net CO2 stored; Sweep efficiency; Miscibility pressures; CO2 mobility; Injection rate (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:217:y:2021:i:c:s0360544220324981

DOI: 10.1016/j.energy.2020.119391

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