烷基羧酸甜菜碱驱油机理研究

doi:10.3969/j.issn.2097-2806.2024.02.001

Abstract

Abstract:

To explore the oil displacement mechanism of betaine surfactants, three alkyl carboxyl betaines with different alkyl chain lengths were selected for microscopic visualization oil displacement experiments. The oil-water interfacial tension （IFT） and the emulsification of crude oil were also measured. The experimental results showed that alkyl carboxyl betaines could effectively reduce the IFT and promote the in-situ emulsification of crude oil. With the increase of alkyl chain length, the IFT decreased and the emulsifying effect was enhanced. The mechanism of enhanced oil recovery by cetyl carboxyl betaine （C₁₆BC） included the following two aspects: 0.3% C₁₆BC could reduce the IFT to the order of magnitude of 10^-2 mN/m, effectively mobilize the crude oil in the pores through emulsification under weak shear, and break the columnar, porous and cluster remaining oil into oil droplets by formation of oil-in-water emulsion, which improved the oil washing efficiency. At the same time, due to the superposition of the Jamin effect generated by emulsified oil droplets, C₁₆BC could stably produce a channel blockage effect, which increased the sweep efficiency by 20%. As an oil displacement agent exhibiting in-situ emulsification synergistic self-profile control, the oil displacement efficiency of C₁₆BC was 42.1% higher than that of formation water flooding, which could be used to improve the recovery of chemical flooding in low-permeability reservoirs.

Key words: betaine, interfacial tension, emulsification, microscopic visualization, oil displacement mechanism

CLC Number:

TQ423

Xiaojie Zhang, Mingzhe Zhang, Zhicheng Xu, Qingtao Gong, Lei Zhang, Lu Zhang. Study on oil displacement mechanism of alkyl carboxyl betaine[J].China Surfactant Detergent & Cosmetics, 2024, 54(2): 123-130.

Figures/Tables 9

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References 15

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Cation/（mg/L）				Anion/（mg/L）			TDS/（mg/L）
Na⁺+K⁺	Ca²⁺	Mg²⁺		Cl^-	SO₄^2-	HCO₃^-	TDS/（mg/L）
20 685.4	9 585.6	727.6		50 480.7	486.8	182.1	82 200

Study on oil displacement mechanism of alkyl carboxyl betaine

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