新型清洁压裂液25-HP-21/NaSal胶束体系流变性研究

doi:10.3969/j.issn.1001-1803.2020.10.001

摘要/Abstract

摘要：

以芥酰胺丙基二甲胺、油酰胺丙基二甲胺、环氧氯丙烷为主要原料合成了新型不对称阳离子Gemini表面活性剂羟丙撑基（芥-油酰胺丙基二甲基氯化铵醋酸铵）（25-HP-21）,将其与水杨酸钠（NaSal）进行复配研究了该黏弹性胶束体系的流变学性质、微流变学性质、耐温性能和携砂性能,并采用¹H NMR表征了NaSal对25-HP-21胶束聚集形态的影响。研究结果表明：在体系中25-HP-21含量固定为2%的情况下改变NaSal的含量,得出25-HP-21/NaSal胶束体系的优化配比为5∶1（w/w）;另外,在固定25-HP-21/NaSal的质量比为5∶1的情况下改变表面活性剂的浓度,则发现3.6%的25-HP-21/NaSal胶束体系具有更优的黏弹性、更显著的剪切变稀性和触变性以及较优的耐温性能和携砂性能;体系的¹H NMR谱图结果表明NaSal的加入有利于促进蠕虫状胶束的形成,表面活性剂分子排列更加紧密。该胶束体系配方简单、性质优异,有望丰富新型清洁压裂液。

关键词: Gemini表面活性剂, 清洁压裂液, 胶束体系, 流变学性质, 微流变学性质

Abstract:

Erucamidopropyl dimethylamine, oleamidopropyl dimethylamine and epichlorohydrin were used as the main raw materials to synthesize a novel asymmetric cationic Gemini surfactant, i.e. hydroxypropylene（erucamido-oleamido propyl dimethyl ammonium） chloride acetate （25-HP-21）. Then 25-HP-21 was mixed with sodium salicylate （NaSal） to obtain a viscoelastic micellar system. The rheological properties, microrheological properties, temperature-resistance and sand-carrying properties of the micellar system were studied. The effects of NaSal on the aggregate morphology of 25-HP-21 micelles was characterized by¹H NMR. The results showed that, when the content of 25-HP-21 in the mixed system was fixed to 2%, the optimized ratio of 25-HP-21/NaSal for this micellar system was 5∶1 （w/w）. In addition, when the mass ratio of 25-HP-21/NaSal was fixed to 5∶1, the micellar system of 3.6% 25-HP-21/NaSal showed better viscoelasticity, temperature-resistance and sand-carrying properties and more significant shear thinning and thixotropy. The¹H NMR spectrum of the system showed that the addition of NaSal was beneficial to the formation of worm-like micelles, and the arrangement of surfactant molecules were more compact. This micellar system had a simple formula and excellent properties, which was expected to enrich the family of novel clean fracturing fluids.

Key words: Gemini surfactant, clean fracturing fluid, micellar system, rheological property, microrheological property

中图分类号:

TQ423

崔秀,方波,许海涛. 新型清洁压裂液25-HP-21/NaSal胶束体系流变性研究[J]. 日用化学工业, 2020, 50(10): 653-659.

CUI Xiu,FANG Bo,XU Hai-tao. Rheological properties of a novel clean fracturing fluid: the micellar system of 25-HP-21/NaSal[J]. China Surfactant Detergent & Cosmetics, 2020, 50(10): 653-659.

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w（NaSal）/%	η₀/（mPa·s）	η_∞/（mPa·s）	λ/s	n	R
0	17.85	1.42	1.51	1.687	0.993
0.2	238.35	3.80	9.22	0.575	0.991
0.3	9.67×10⁴	12.15	110.13	0.903	0.999
0.4	9.25×10⁷	130.97	6 398.77	1.108	0.997
0.55	4.21×10³	15.91	1.022	1.154	0.995

w（NaSal）/%	面积/（Pa·s^-1）
0	0.04
0.2	1.00
0.3	1.65
0.4	188.83
0.55	49.41

w/%	面积/（Pa·s^-1）
1.2	1.40
2.4	188.83
3.6	552.87
4.8	78.26