基于强双疏相互作用的自修复速溶抗盐酸液稠化剂

A Self-healing，Quick-dissolving and Hydrochloric Acid-resistant Thickener Based on Strong Amphiphobic Interaction

方裕燕 史文静 方俊伟 潘丽娟 焦克波 李 亮 王彦玲 梁诗南

FANG Yuyan SHI Wenjing FANG Junwei PAN Lijuan JIAO Kebo LI Liang WANG Yanling LIANG Shinan

酸化酸压储层改造技术是增产上产的重要手段。传统干粉状酸液稠化剂在配制酸液时，溶解时间大于2 h，无法现场连续混配，而溶解性较佳的乳液稠化剂，耐酸性、耐盐性及特殊环境下的耐剪切性均有待提升。文章使用APS/TEMPO 复合催化剂，以丙烯酰胺（AM）、含氟类、磺酸盐类、氯化铵类单体为原料通过反相乳液聚合法制得了基于强双疏相互作用剪切后可自修复的速溶抗盐酸液稠化剂PASD，通过红外光谱表征了PASD的化学结构，并测试了其相对分子质量、稳定性、耐酸性、酸溶时间、耐温性、耐盐性、抗剪切性、双疏反转性和驱替性能。该稠化剂化学稳定性优异，无机盐离子浓度低于50 mg/L 时，黏度可维持在24 mPa·s以上；可在20%盐酸中实现3 min 内快速酸溶，增黏酸黏度可达38 mPa·s；当遭到强剪切破坏后，30 min 内黏度自修复率达65%。PASD增黏酸破胶后还可对岩石表面进行强双疏性（超疏水、强疏油）润湿反转，降低毛细作用及驱替压力，更大程度沟通地层孔隙裂缝。该研究为实现酸液在线混配及稠化酸压裂驱替一体化提供了材料基础。

Acidizing and acid fracturing reservoir reconstruction technology is an important means to increase production. Traditional dry powder acid thickener has a dissolution time of more than 2 h when used to prepare acid solution，which makes it impossible to continuously mix on site. As for the emulsion thickener with better solubility，acid resistance，salt resistance and shear resistance in special environment need to be improved. In this paper，using APS/TEMPO composite catalyst，acrylamide （AM），fluorine-containing，sulfonate-containing and ammonium chloride-containing monomers as raw materials，a self-healing， quick-dissolving and hydrochloric acid-resistant thickener PASD based on strong amphiphobic interaction was prepared by inverse emulsion polymerization. The chemical structure of PASD was characterized by infrared spectroscopy，and its relative molecular mass，stability，acid resistance，acid dissolution time，temperature resistance，salt resistance，shear resistance，amphiphobic inversion and displacement performance were tested. The thickener PASD had excellent chemical stability. When the concentration of inorganic salt ions was less than 50 mg/L，the viscosity could be maintained above 24 mPa·s. PASD could be dissolved in 20 % hydrochloric acid within 3 min，and the viscosity of tackifying acid could reach up to 38 mPa·s. When destroyed by strong shear，the viscosity self-healing rate of the tackifying acid was 65% within 30 min. The gel breaking liquid of PASD tackifying acid could result in wettability reversal of rock with strong-amphiphobic（super-hydrophobic and strong oleophobic），reduce capillary action and driving pressure，and communicate with the pore cracks of the formation to a greater extent. This study provides a material basis for the realization of on-line mixing of acid liquid and the integration of thickened acid fracturing and replacement.

10.19346/j.cnki.1000-4092.2025.01.008