低渗透油藏缓释型表面活性剂纳米载体研究

doi:10.3969/j.issn.1001-1803.2022.11.001

Abstract

Abstract:

To solve the serious adsorption problem of surfactant flooding in low-permeability reservoir, beeswax, TX-10 and deionized water were used as oil phase, surfactant and water phase to prepare nanoemulsions. The ultrasonic emulsification method at a temperature above the melting point of beeswax （61 ℃） was applied, and then the temperature was reduced to fix TX-10 inside the oil phase, and thus a slow-release surfactant nanocarrier was obtained. By means of UV-vis spectrophotometer, particle size analyzer, interfacial tensiometer and contact angle analyzer, the encapsulation rate and oil displacement properties of nanocarriers were measured. The results showed that, with the increase of TX-10 mass concentration, the average particle size of the nanocarriers was decreased first and then increased, and the minimum particle size was approximately 105 nm when the concentration was 5 000 mg/L, and the encapsulation rate for TX-10 was approximately 90%. At the formation temperature （65 ℃）, the nanocarriers could reduce the interfacial tension between simulated oil and water to 3.24×10^-2 mN/m and the surface tension to 23.3 mN/m, which was better than the TX-10 solution alone. Moreover, the nanocarriers behaved slow-release in the process of reducing interfacial tension. In addition, the nanocarriers could reverse the wettability of the surface of oleophilic core, which was similar to TX-10 solution. The static adsorption loss rate was less than 0.1%, which was more than ten times lower than that of TX-10 solution. At 30 and 65 ℃, the oil washing efficiency of the nanocarriers was 87.7% and 92.3%, respectively, which was 4% higher than that of TX-10 solution. The nanocarriers prepared in this study can carry surfactants to migrate in formation pores and release surfactants slowly when in contact with crude oil. The nanocarriers have anti-adsorption ability while ensuring the performance of surfactants, showing a good application prospect for enhanced oil recovery in low-permeability reservoirs.

Key words: low permeability reservoir, enhanced oil recovery, surfactant, nanocarrier, slow-release

CLC Number:

TQ423

Kang Wanli,Wang Kanghui,Li Zhe,Lv Wei,Yang Hongbin,Jia Ruxue,He Yingqi. Study on slow-release surfactant nanocarriers in low-permeability reservoirs[J].China Surfactant Detergent & Cosmetics, 2022, 52(11): 1147-1154.

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References 27

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种类	30 ℃接触角/（°）	65 ℃接触角/（°）
模拟油	149	149
5 000 mg/L NaCl溶液	132	117
5 000 mg/L TX-10溶液	106	52
纳米载体	103	63

种类	吸附量/（mg/g）	吸附损失率/%
5 000 mg/L TX-10溶液	1.875	12.5
纳米载体	0.013	<1

Study on slow-release surfactant nanocarriers in low-permeability reservoirs

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