Mechanisms of High-salinity Improvement of the Stability of Betaine Foam

doi:10.11885/j.issn.1674-5086.2021.06.03.02

Abstract

Abstract: Betaine foam, characterized by its salt tolerance and the heightened stability with increasing salinity, holds a unique advantage in improving oil recovery in high-salinity reservoirs. In this paper, cocoamidopropyl hydroxysulfobetaine and dodecyl hydroxypropyl sulfobetaine were taken as the foam system to explore the mechanisms of high-salinity improvement foam stability. Foam performance tests have proceeded under various high-salinities. Particular attention was given to the surface dilatation rheology and diffusion-adsorption behaviors. The results showed that when the concentration of NaCl increased from 2.3% to 21.1%, the drainage velocity of betaine foam at the initial stage had little change, but the half-life of the foam could be extended by 13 times. With increased salinity, the saturated adsorption amount of betaine increased and the diffusion-adsorption rate decreased, which led to the increase of the dilatation modulus and the enhancement of the elasticity of the liquid film. Therefore, the coarsening and coalescence of betaine foam were significantly inhibited, resulting in improved foam stability. This work will generate fresh insight into the mechanisms of foam stability and optimization of foam system in high-salinity reservoirs.

Key words: betaine, foam stability, high salinity, dilatation rheology, diffusion-absorption

CLC Number:

TE357

SUN Lin, DONG Shuo, ZHANG Yongchang, XIN Jun, PU Wanfen. Mechanisms of High-salinity Improvement of the Stability of Betaine Foam[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(6): 185-192.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2021.06.03.02

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