2-羟基-3-十八烷氧基丙基胍胶的制备与性能评价

Preparation and Performance Evaluation of 2-hydroxy-3-n-octadecyloxy Propyl Guarhum

张科良 吴 琦

ZHANG Keliang，WU Qi

以十八烷基缩水甘油醚为疏水化改性剂、胍胶原粉为原料、氢氧化钠为催化剂、乙醇为溶剂，通过开环加成反应合成了胍胶衍生物增稠剂 HOPG——2-羟基-3-十八烷氧基丙基胍胶，模拟现场配方对采用该稠化剂配制的压裂液的挑挂性能、破胶性能与耐温抗剪切性能进行了评价。采用 HOPG配制的压裂液溶解性能和挑挂性能良好；0.3% HOPG+0.3%交联剂 JL-13+0.2% APS的压裂液破胶后的残渣含量明显低于用未改性胍胶配制压裂液的，冻胶于 90℃下破胶 1 h后的破胶液黏度仅为 1.02 mPa·s，破胶液残渣量仅为 182 mg/L；该压裂液具有优良的耐温抗剪切性能，冻胶在 80℃、剪切速率 170 s-1条件下剪切 70 min后的表观黏度为 165 mPa·s，远大于行业标准（不低于 50 mPa·s）。图 3表4参 12

2-hydroxy-3-n-octadecyloxy propyl guarhum （HOPG） was synthesized with guar gum（GG） as material，using n-octadecyloxy propyl glycidyl ether（OPGE）as the hydrophobic reagent，sodium hydroxide as catalyst and 95% ethanol as solvent through ring opening addition reaction. The crosslinking performance，temperature resistance and shearing performance，breaking performance of the HOPG fracturing fluid were evaluated by simulating the scene formula. The experimental results showed that the HOPG had better solubility and crosslinking performance. When breaking the gelled fracturing fluid，composed of 0.3% HOPG + 0.3% JL-13+0.2% APS，at 90℃ for 1 h，the insoluble content of the broken fluid was only 182 mg/L，and the viscosity of the broken fluid was only 1.02 mPa·s，which was obviously lower than that of the broken fluid prepared with the GG. Moreover，the temperature resistance and shear resistance of the HOPG fracturing fluid was better，the apparent viscosity of the HOPG fracturing fluid was 165 mPa·s when sheared for 70 min at the temperature of 80℃and at the shear rate of 170 s-1.