天然高分子植物胶絮凝剂的合成及应用研究

Development and Application of Natural Polymer Vegetable Gum Flocculant

陈腾飞 程 芳 程晓亮 龙学莉 赵众从

CHEN Tengfei CHENG Fang CHENG Xiaoliang LONG Xueli ZHAO Zhoncong

针对油气田压裂返排液中机械杂质含量较高，直接回用造成储层二次伤害等问题，以环氧丙烷为醚化剂， 用3-氯2-羟丙基三甲基氯化铵对瓜尔胶进行氨基化阳离子改性合成了天然高分子瓜尔胶絮凝剂CG-1，考察了絮凝剂CG-1的阳离子度、CG-1加量、助凝剂种类和加量以及环境pH对絮凝效果的影响，并考察了絮凝剂CG-1体系分别对现场的中性、酸性压裂液返排液的处理效果。研究结果表明，在阳离子度为 14%的条件下，絮凝剂CG-1加量为0.1%，助凝剂B（二元羧酸类）加量为0.2%~0.4%时，返排液沉降20 min可达到彻底絮凝。该絮凝剂体系适用性广，对中性、酸性压裂液返排液均具有较好的絮凝效果，且经絮凝处理后的返排液可以直接配液并进行压裂施工作业，施工成功率为100%。图7表3参12

In order to solve the problem of mechanical impurities and the secondary damage caused by direct reuse of the fracturing flowback fluid of oil and gas fields，the natural high molecular weight guar gum flocculant CG-1 was synthesized by amination cation modification reaction of guar gum with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride using propylene oxide as etherification agent. The effect of the cationic degree of CG-1，CG-1 dosage，the type and dosage of coagulant and the environmental pH on flocculation performance of the system were investigated，and the treatment effect of the flocculant CG-1 system on the field neutral and acid fracturing fluid flowback fluid was investigated. The results showed that when the dosage of flocculant CG-1 with the cation degree of 14% was 0.1%，the dosage of coagulant aids B（a kind of dicarboxylic acid）was 0.2%— 0.4%，the flowback liquid was settled for 20 min and reached complete flocculation. The flocculant system had wide applicability， which had good flocculation effect on both neutral and acid fracturing fluid flowback fluid. The flowback fluid after flocculation treatment could be directly used for field fluid preparation，and the operation success rate was 100%.

10.19346/j.cnki.1000-4092.2019.04.008