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Tian K, Pu W, Wang Q, Xie M, Wang D, Wang M, Liu S. A Feasibility Study on Enhanced Oil Recovery of Modified Janus Nano Calcium Carbonate-Assisted Alkyl Polyglycoside to Form Nanofluids in Emulsification Flooding. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4174-4185. [PMID: 38359328 DOI: 10.1021/acs.langmuir.3c03203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
Emulsification flooding can effectively enhance crude oil recovery to solve the problem of petroleum shortage. In this work, a modified Janus Nano Calcium carbonate (JNC-12) with a particle size of 30-150 nm was synthesized, and an in situ emulsification nanofluid (ISEN) was prepared with JNC-12 and alkyl polyglycoside (APG). Scanning electron microscope (SEM) showed that the dispersion of JNC-12 in air or APG solution was better than Nano Calcium carbonate (Nano CaCO3). The emulsification properties, interfacial tension, and expansion modulus of ISEN were studied, and the result showed that with the increase in salinity, the emulsification rate decreased, the water yield rate increased, the interfacial tension first decreased and then increased, and the expansion modulus first increased and then decreased. With the increase in temperature, the emulsification rate, emulsion viscosity, and interfacial tension decreased. With the increased oil-water volume, the water yield rate and the emulsion viscosity increased. With increase in the concentration of JNC-12, the water yield rate, the emulsion viscosity, and the interfacial tension decreased but the expansion modulus increased. The emulsion generated by emulsifying ISEN with crude oil was an O/W emulsion, the crude oil viscosity was 4-10 times that of emulsion, and the average particle size of emulsion was 1.107 μm. The addition of ISEN caused the decrease in interfacial tension of oil-water to 0.01-0.1 mN/m. The wettability alteration experiment found that ISEN could change the lipophilic rock to hydrophilic rock. Finally, the core displacement experiments showed that compared with the first water flooding, the oil recovery of the second water flooding after ISEN flooding enhanced by 17.6%. This research has important guiding significance for in situ emulsified nanofluid flooding to enhance oil recovery.
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Affiliation(s)
- Kaiping Tian
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
- School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China
| | - Wanfen Pu
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
- School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China
| | - Qianlong Wang
- School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China
| | - Mengke Xie
- Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610051, China
| | - Dongdong Wang
- Sinopec Production Engineering and Technology Institute, Zhongyuan Oilfield Branch Company, Sinopec, Puyang 457001, China
| | - Muming Wang
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
| | - Shun Liu
- School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China
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