聚合物及固体颗粒对原油乳状液稳定性影响机制研究

doi:10.3969/j.issn.2097-2806.2023.10.006

Abstract

Abstract:

To clarify the reasons why the backflow residue of oilfield operation affects the dehydration of produced crude oil, the mechanisms for single polymers, single solid particles and the coexistence of a polymer and particles affecting the stability of crude oil emulsion were studied, in which NPAM and guar gum, which are the most common backflow residues, were taken as the representatives of polymers, and quartz sand as the representative of solid particles. The results showed that single polymers could influence the stability of the emulsion. When the mass concentration of the polymer was increased to 1 000 mg/L, the dehydration rate of the emulsion was decreased to 0%, and the peak of particle size distribution was less than 10 μm. The viscosity was significantly increased, i.e., the viscosity of the emulsion containing guar gum was increased to 3.80 times, and the viscosity of the emulsion containing NPAM was increased to 2.82 times. The equilibrium interfacial tension was decreased, the viscoelasticity of the oil-water interface was increased, and the elastic modulus was 4-5 times that of the viscous modulus. In this case, the boundary film was mainly elastic, the strength of the boundary film was increased, and thus the stability of the emulsion was increased. The influence of single solid particles on the emulsion was that, when the solid content was increased to 1%, the dehydration rate of the emulsion was decreased by 9.90%, the viscosity was increased by 46.36%, and the interfacial tension between oil and water was decreased by approximately 9.10%. The coexistence of a polymer and solid particles had superposition effect on the stability of the emulsion. The increase of the polymer and solid particles in emulsion would increase the difficulty of dehydration and the stability of the emulsion. When the solid particle content was fixed at 1% and the polymer concentration was increased, the dehydration rate was decreased from 54.50% to 0%, the viscosity was increased to 3.58 times, and the peak of particle size distribution was significantly decreased.

Key words: polymers and particles, crude oil emulsion, stability, influence mechanism

CLC Number:

TQ423

Yang Chao, Tong Zhiming, Wang Zhansheng, Chen Wu. Study on the influence mechanisms of polymers and solid particles on the stability of crude oil emulsion[J].China Surfactant Detergent & Cosmetics, 2023, 53(10): 1156-1165.

Figures/Tables 16

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ρ/（mg/L）
Na⁺、K⁺	Ca²⁺	Mg²⁺	SO₄^2-	Cl^-	CO₃^2-	HCO₃^-	可溶性SiO₂	矿化度	pH	水型
15 533.8	1 708.6	364.0	6.0	27 355.8	0	356.4	33.23	45 046.83	7.2	CaCl₂

Study on the influence mechanisms of polymers and solid particles on the stability of crude oil emulsion

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