疏水缔合型交联酸稠化剂的制备与应用

Preparation and Application of Hydrophobic Associating Crosslinking Acid Thickener

为改善常规稠化剂的耐温性和抗剪切性,以丙烯酰胺(AM)、二甲基二烯丙基氯化铵(DMDAAC)、丙烯酸(AA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、疏水单体YD-D10为原料,采用自由基水溶液聚合法制备了疏水缔合型交联酸液稠化剂(AAG4)。对AAG4的制备条件进行了优化,并对其结构进行了表征,考察了以AAG4为稠化剂配制的交联酸的各项性能。结果表明,AAG4的最佳制备条件为:引发剂偶氮二异丁基盐酸盐加量0.01%、硫酸铵-亚硫酸氢钠(质量比1∶1)加量0.04%,YD-D10加量0.42%,反应温度35℃,反应时间6 h。AAG4的热稳定性良好。在盐酸质量分数为20%的条件下,AAG4与有机锆交联剂的交联性能优异,交联酸液表现出良好的耐温、抗剪切性能。120℃、170 s^-1下剪切1 h的酸液黏度为82 mPa·s。交联酸的缓速性能较好,在90℃下其与天然岩心的反应速率远小于盐酸的反应速率,交联酸的缓速率达到97.3%。在30℃下交联酸对天然岩心的最终溶蚀率与20%HCl相当,现场酸压施工效果良好,可以实现高温碳酸盐岩储层的深度改造。

In order to improve the thermal endurance and shearing resistance of conventional thickener,a hydrophobic associating crosslinking acid thickener AAG4 was synthesized by using acrylamide(AM),dimethyldiallyl ammonium chloride(DMDAAC),acrylic acid(AA),2-acrylamido-2-methylpropanesulfonic acid(AMPS)and hydrophobic monomer YD-D10 as raw materials through radical aqueous solution polymerization process.The synthesis process of AAG4 was optimized,the structure was characterized,and the properties of crosslinked acid prepared with AAG4 was investigated.The results showed that the optimum preparation condition of AAG4 was obtained as follows:0.01%initiator azodiisobutyl hydrochloride(V040),0.04%ammonium sulfate and sodium bisulfite in mass ratio 1∶1,0.42%YD-D10,35℃reaction temperature,6 hours reaction time.AAG4 had good thermal stability.When the dosage of hydrochloric acid was 20%,AAG4 had good crosslinked property with organic zirconium cross-linking agent and the crosslinked solution possessed excellent temperature and shearing resistance.The viscosity of acid was 82 mPa·s after shearing for 1 h at 120℃and 170 s^-1.The reaction rate of crosslinked acid with natural core was much lower than that of hydrochloric acid at 90℃,and the retarding rate of crosslinked acid was 97.3%,indicating good retardative property.The final dissolution rate of natural core by crosslinked acid was equivalent to that by 20%hydrochloric acid at 30℃.The acid pressure construction effect on site was good,which could realize the depth transformation of carbonate reservoir at high temperature.