期刊
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
卷 181, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.petrol.2019.106210
关键词
Associated gas; Miscible gas injection; Thickened gas; Equilibrium interfacial tension; Minimum miscibility pressure; First contact miscibility pressure; Cloud point pressure
资金
- Petroleum Development Oman (PDO) in Oman
- Ministry of Oil and Gas (MOG) in Oman
- Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), China [PLN201705]
The solubility of an oligomer in a supercritical gas solvent (e.g. CO2 or associated gas (AG) mixture) and the subsequent effects on the phase behaviour, interfacial tension (IFT) and miscibility pressure of the in-situ oil/oligomer-thickened gas system at a molecular level are crucial to understanding and designing a thickened miscible gas injection (MGI) process. We have conducted cloud point pressure measurements, which revealed that the phase behaviour of P-1-D-thickened CO2 would follow a UCST (upper critical solution temperature) trend while P-1-D-thickened AG mixture would lie close to a LCST (lower critical solution temperature) behaviour. Moreover, our measured equilibrium IFTs of crude oil/P-1-D-thickened CO2 system and crude oil/PVEE-thickened CO2 system were found to be slightly lower than those of the crude oil/CO2 system. This results in a slight reduction in the MMP (minimum miscibility pressure) and considerable reduction in the first contact miscibility pressure (P-max). We found the dissolution of P-1-D in the AG mixture to cause an increase in the equilibrium IFT for the crude oil/P-1-D-thickened AG mixture system, resulting in an increase in both of the MMP and P-max. This indicates that the dissolution of an oligomer may have a considerable effect on the crude oil/thickened gas IFT behaviour at a pressure close to the cloud point pressure.
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