Polymer efficiency and sulfate concentration for hybrid EOR application to an acidic carbonate reservoiropen access
- Authors
- Lee, Yeonkyeong; Sung, Wonmo; Wang, Jihoon
- Issue Date
- Apr-2023
- Publisher
- KeAi Communications Co.
- Keywords
- Polymer efficiency; Low -salinity polymer flooding; Polymer adsorption; Wettability alteration; Sulfate ion; Acidic carbonate reservoir
- Citation
- Petroleum Science, v.20, no.2, pp.993 - 1004
- Indexed
- SCIE
SCOPUS
- Journal Title
- Petroleum Science
- Volume
- 20
- Number
- 2
- Start Page
- 993
- End Page
- 1004
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191758
- DOI
- 10.1016/j.petsci.2022.11.012
- ISSN
- 1672-5107
- Abstract
- Polymers play an important role in hybrid enhanced oil recovery (EOR), which involves both a polymer and low-salinity water. Because the polymer commonly used for low-salinity polymer flooding (LSPF) is strongly sensitive to brine pH, its efficiency can deteriorate in carbonate reservoirs containing highly acidic formation water. In this study, polymer efficiency in an acidic carbonate reservoir was investigated experimentally for different salinity levels and SO42− concentrations. Results indicated that lowering salinity improved polymer stability, resulting in less polymer adsorption, greater wettability alteration, and ultimately, higher oil recovery. However, low salinity may not be desirable for LSPF if the injected fluid does not contain a sufficient number of sulfate (SO42−) ions. Analysis of polymer efficiency showed that more oil can be produced with the same polymer concentration by adjusting the SO42− content. Therefore, when river water, which is relatively easily available in onshore fields, is designed to be injected into an acidic carbonate reservoir, the LSPF method proposed in this study can be a reliable and environmentally friendly method with addition of a sufficient number of SO42− ions to river water.
- Files in This Item
-
- Appears in
Collections - 서울 공과대학 > 서울 자원환경공학과 > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.