Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment
With the technology of enhanced oil recovery by supercritical CO2 flooding (scCO2-EOR) popularized and applied, the water-in-oil (W/O) emulsion can be easily formed in the surface gathering pipeline when the produced crude oil and water flows through the pump and throttle valve. The formation of emu...
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Elsevier
2025-02-01
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| Series: | Journal of CO2 Utilization |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212982025000149 |
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| author | Guangyu Sun Fujun Sheng Qingyi Li Chuanxian Li Fei Yang Bo Yao Yansong Zhao |
| author_facet | Guangyu Sun Fujun Sheng Qingyi Li Chuanxian Li Fei Yang Bo Yao Yansong Zhao |
| author_sort | Guangyu Sun |
| collection | DOAJ |
| description | With the technology of enhanced oil recovery by supercritical CO2 flooding (scCO2-EOR) popularized and applied, the water-in-oil (W/O) emulsion can be easily formed in the surface gathering pipeline when the produced crude oil and water flows through the pump and throttle valve. The formation of emulsion increases the resistance and cost of pipeline transportation tremendously. Considering the detrimental effect of emulsion formation, we focus on the effect of CO2 treatment on rheological properties and stability of emulsion within the pipeline. It is hoped to provide some guidance for the increase in the efficiency of pipeline transportation and emulsion treatment. In this work, a device was developed to simulate the scCO2 treatment conditions in the reservoir. The variations in gelation process, pour point, yield stress, viscosity-temperature property and coalescence stability of emulsion were studied experimentally under treatment conditions (without any treatment, treated by 80 ℃, 5 MPa, treated by 80 ℃, 15 MPa, treated by 80 ℃, 25 MPa). The effect of scCO2 treatment on gelation property of emulsion was reported for the first time. The results show that the storage modulus and gelation temperature are increased obviously after the scCO2 treatment, which is owing to the influence of scCO2 treatment on wax crystals morphology and gelation structure of system. As for the pour point, yield stress, and viscosity/apparent viscosity, they are all enlarged greatly after scCO2 treatment, due to the scCO2 extraction effect. Finally, the sizes of emulsion droplets gradually decrease with the treatment pressure, leading to the improvement of emulsion stability. |
| format | Article |
| id | doaj-art-3fc12e4595804bf189a26d8cfac95628 |
| institution | Kabale University |
| issn | 2212-9839 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of CO2 Utilization |
| spelling | doaj-art-3fc12e4595804bf189a26d8cfac956282025-01-31T05:11:15ZengElsevierJournal of CO2 Utilization2212-98392025-02-0192103030Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatmentGuangyu Sun0Fujun Sheng1Qingyi Li2Chuanxian Li3Fei Yang4Bo Yao5Yansong Zhao6College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Shandong Key Laboratory of Oil & Gas & New Energy Storage and Transportation Safety, Qingdao, Shandong Province 266580, China; Corresponding author at: College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China.College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, ChinaCollege of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, ChinaCollege of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Shandong Key Laboratory of Oil & Gas & New Energy Storage and Transportation Safety, Qingdao, Shandong Province 266580, ChinaCollege of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Shandong Key Laboratory of Oil & Gas & New Energy Storage and Transportation Safety, Qingdao, Shandong Province 266580, ChinaCollege of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Shandong Key Laboratory of Oil & Gas & New Energy Storage and Transportation Safety, Qingdao, Shandong Province 266580, ChinaDepartment of Safety, Chemistry and Biomedical Laboratory Sciences, Western Norway University of Applied Sciences (HVL), Bergen 5063, NorwayWith the technology of enhanced oil recovery by supercritical CO2 flooding (scCO2-EOR) popularized and applied, the water-in-oil (W/O) emulsion can be easily formed in the surface gathering pipeline when the produced crude oil and water flows through the pump and throttle valve. The formation of emulsion increases the resistance and cost of pipeline transportation tremendously. Considering the detrimental effect of emulsion formation, we focus on the effect of CO2 treatment on rheological properties and stability of emulsion within the pipeline. It is hoped to provide some guidance for the increase in the efficiency of pipeline transportation and emulsion treatment. In this work, a device was developed to simulate the scCO2 treatment conditions in the reservoir. The variations in gelation process, pour point, yield stress, viscosity-temperature property and coalescence stability of emulsion were studied experimentally under treatment conditions (without any treatment, treated by 80 ℃, 5 MPa, treated by 80 ℃, 15 MPa, treated by 80 ℃, 25 MPa). The effect of scCO2 treatment on gelation property of emulsion was reported for the first time. The results show that the storage modulus and gelation temperature are increased obviously after the scCO2 treatment, which is owing to the influence of scCO2 treatment on wax crystals morphology and gelation structure of system. As for the pour point, yield stress, and viscosity/apparent viscosity, they are all enlarged greatly after scCO2 treatment, due to the scCO2 extraction effect. Finally, the sizes of emulsion droplets gradually decrease with the treatment pressure, leading to the improvement of emulsion stability.http://www.sciencedirect.com/science/article/pii/S2212982025000149RheologySupercritical CO2Emulsion dropletsWax crystalGelation structure |
| spellingShingle | Guangyu Sun Fujun Sheng Qingyi Li Chuanxian Li Fei Yang Bo Yao Yansong Zhao Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment Journal of CO2 Utilization Rheology Supercritical CO2 Emulsion droplets Wax crystal Gelation structure |
| title | Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment |
| title_full | Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment |
| title_fullStr | Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment |
| title_full_unstemmed | Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment |
| title_short | Rheological properties and coalescence stability of degassed crude oil emulsion: Influence of supercritical CO2 treatment |
| title_sort | rheological properties and coalescence stability of degassed crude oil emulsion influence of supercritical co2 treatment |
| topic | Rheology Supercritical CO2 Emulsion droplets Wax crystal Gelation structure |
| url | http://www.sciencedirect.com/science/article/pii/S2212982025000149 |
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