Stabilization and performance of a novel viscoelastic N2 foam for enhanced oil recovery
Jiang H. Kang W. Li X. Peng L. Yang H. Li Z. Wang J. Li W. Gao Z. Turtabayev S.
1 September 2021Elsevier B.V.
Journal of Molecular Liquids
2021#337
A novel viscoelastic N2 foam (0.12% sodium dodecyl sulfate + 0.18% erucyl dimethyl amidopropyl betaine) with ultra-low interfacial tension and alkali-free was developed. With the conditions of Xinjiang Oilfield (45℃, c (salinity) = 7880 mg/L), the foam performances were investigated by the modified Rose-Miles method. The modified Rose-Miles method is in non-shear action, in which N2 enters a porous media and pumps into the solution to produce foam. The stability mechanism was explained based on the dilatational surface viscoelasticity and liquid viscoelasticity. The EOR effect was evaluated by the displacement experiment. The results showed that the foam volume of viscoelastic N2 foam was five times compared with the initial solution. The foam half-life and the drainage half-life were 6.5 and 6.2 times higher compared with that of stabilized by the polyacrylamide, respectively. The surface of N2 foam possessed high elasticity modulus, and the solution had high viscoelasticity, so the particle size and drainage of liquid film changed slowly. Finally, the viscoelastic N2 foam flooding (0.4PV surfactant + 0.4PV N2) enhanced oil recovery by 22.95%, compared with the surfactant flooding (0.8PV surfactant) by 4.06%. The viscoelastic N2 foam could greatly reduce the amount of surfactant and had an excellent EOR application in the Xinjiang Oilfield.
Elasticity modulus , Foam flooding , Stabilization mechanism , Ultra-low interfacial tension , Viscoelastic N2 foam
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Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, 266580, China
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
Yanchang Oilfield Co., Ltd., Yanan 716000, Shaanxi, China
Khoja Akhmet Yassawi International Kazakh-Turkish University, Turkestan, 161200, Kazakhstan
Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China))
School of Petroleum Engineering
Yanchang Oilfield Co.
Khoja Akhmet Yassawi International Kazakh-Turkish University
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