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Reducing the minimum miscibility pressure of CO2 and crude oil using alcohols.
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . May2019, Vol. 568, p105-112. 8p. - Publication Year :
- 2019
-
Abstract
- Graphical abstract Abstract The establishment of a miscible phase between CO 2 and crude oil can significantly improve CO 2 flooding efficiency. However, the minimum miscibility pressure (MMP) between CO 2 and crude oil is usually higher than the fracture pressure of the formation, how to reduce the MMP between CO 2 and crude oil is very important, and there are fewer related studies. Our inspiration for reducing MMP comes from the unique dispersion characteristics of CO 2 in alcohol, the intermolecular force of crude oil may decrease due to the existence of alcohols. In this paper, the CO 2 solubility and the oil volume expansion with adding a variety of alcohols (1-butanol, 1-pentanol and 1-hexanol) were measured by a visible high temperature and high pressure cell from 7 MPa to 20 MPa at 343.15 K. The MMP between CO 2 and crude oil is predicted by measuring the interfacial tension (IFT) between CO 2 and crude oil from 2 MPa to 43.3 MPa at 343.15 K. The results showed that the CO 2 solubility in crude oil and the oil volume expansion were greatly improved due to the addition of alcohols. Especially 1-butanol, 1-pentanol and 1-hexanol were mixed by 8:1:1(volume ratio), 5% (volume ratio) alcohols mixture was added to the crude oil, the CO 2 solubility in crude oil increased by 28.74% at 345.15 K and 19 MPa, and the volume expansion coefficient of crude oil also increased by 4.45% at 345.15 K and 14 MPa. It is encouraging to note that the MMP between CO 2 and crude oil decreases by 9.21% after adding 5% alcohols mixture into crude oil. This article is able to provide a new technique for reducing the MMP between CO 2 and crude oil in the field of enhanced oil recovery. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PETROLEUM
*HEAVY oil
Subjects
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 568
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 135350644
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2019.02.004