期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 630, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127568
关键词
Fracturing-flooding system; Viscoelastic surfactant (VES); Performance evaluation; Enhanced oil recovery
资金
- National Key Research and Development Project [2019YFA0708700]
- National Natural Science Foundation of China [51874337, 51834010]
- Fundamental Research Funds for the Central Universities [19CX07001A]
A novel VES fracturing-flooding system composed of amphoteric and cationic surfactants shows excellent viscoelastic properties, shear resistance, and drag reduction rate. The system exhibits good anti-swelling properties, minimal formation damage, and dual effects of fracturing and flooding in enhancing oil recovery.
A novel viscoelastic surfactant (VES) fracturing-flooding system composed of amphoteric surfactant octadecyl hydroxypropyl sultaine (OCHSB), cationic surfactant octadecyl trimethyl ammonium chloride (OTAC) and ptoluene sodium sulfonate (NaPts) is proposed to greatly enhance oil recovery. The synergistic effects of two surfactants and counterions were explored and the optimal dosage was determined. Rheological tests show that the system has excellent viscoelastic properties and shear resistance. The shear viscosity of the system with the addition of 4.8 wt% is higher than 25 mPa.s at 80 degrees C and 170 s(-1). Meanwhile, the drag reduction rate of the system can reach more than 70%. In addition, the system breaks the gel thoroughly, has excellent anti-swelling properties, and the damage to the formation is less than 5%. Finally, the enhanced oil recovery regulations of the system were studied through flooding experiment, and its mechanism was analyzed. The enhanced recovery proves that the system has the dual effects of fracturing and flooding.
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