Compositional Modeling of Dimethyl Ether-CO2 Mixed Solvent for Enhanced Oil Recoveryopen access
- Authors
- Lee, Young Woo; Lee, Hye Seung; Jeong, Moon Sik; Cho, Jinhyung; Lee, Kun Sang
- Issue Date
- Jan-2021
- Publisher
- MDPI
- Keywords
- dimethyl ether (DME); water alternating gas (WAG); enhanced oil recovery (EOR); chemical solvent; miscible gas
- Citation
- APPLIED SCIENCES-BASEL, v.11, no.1, pp.1 - 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SCIENCES-BASEL
- Volume
- 11
- Number
- 1
- Start Page
- 1
- End Page
- 14
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/142484
- DOI
- 10.3390/app11010406
- ISSN
- 2076-3417
- Abstract
- Dimethyl ether (DME) is a compound first introduced by Shell as a chemical solvent for enhanced oil recovery (EOR). This study aims to investigate the efficiency of EOR using the minimum miscible pressure (MMP) and viscous gravity number when a mixed solvent of CO2 and DME is injected. Adding DME to the CO2 water-alternating-gas process reduces the MMP and viscous gravity number. Reduction in MMP results in miscible conditions at lower pressures, which has a favorable effect on oil swelling and viscosity reduction, leading to improved mobility of the oil. In addition, the viscous gravity number decreases, increasing the sweep efficiency by 26.6%. Numerical studies were conducted through a series of multi-phase, multi-component simulations. At a DME content of 25%, the MMP decreased by 30.1% and the viscous gravity number decreased by 66.4% compared with the injection of CO2 only. As a result, the maximum oil recovery rate increased by 31% with simultaneous injection of DME and CO2 compared with only using CO2.
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