压裂返排液电催化氧化解交联降黏分析*

Electrocatalytic Oxidation Decrosslinking and Viscosity Reduction of Fracturing Flowback Fluid

赵瑞玉 洪美媛 孙重祥 杨永军 樊玉新 刘大鹏

ZHAO Ruiyu HONG Meiyuan SUN Chongxiang YANG Yongjun FAN Yuxin LIU Dapeng

为了研究电催化氧化技术处理压裂返排液中的主要有机物羟丙基胍胶降黏机理，考察了处理条件如处理 时间、处理温度、电流密度等对模拟羟丙基胍胶基压裂返排液黏度、硼赋存形态的影响，以及通过极板电子交换 的直接氧化与电化学过程生成的活性氧化物的间接氧化对羟丙基胍胶降解的影响。研究表明，羟丙基胍胶压裂 返排液的降黏率随电催化氧化处理时间延长、温度的升高、电流密度的增加、Cl-浓度增加而提高，研究得到最佳 处理条件：时间＞100 min、温度＞25℃、电流密度≥70 A/m2、［Cl-］≥4855 mg/L；电催化氧化降解过程中间接氧化 与直接氧化共同起作用。压裂返排液在降黏的同时可以解交联并释放出交联的硼。图8 表1参21

in this paper，the electrocatalytic oxidation degradation of fracturing flowback fluid was studied，and the effects of treatment conditions，such as treatment time，treatment temperature and current density，on the viscosity and boron form of simulated hydroxypropyl guar gum based fracturing flowback fluid，as well as the effects of direct oxidation caused by electron exchange between electrode plate and guar gum and indirect oxidation caused by an active oxide produced by an electrochemical process on the degradation of hydroxypropyl guar gum were investigated. The results showed that the viscosity reduction rate of the fracturing flowback fluid increased as follows，treatment time＞100 min，treatment temperature＞25℃，current density≥70 A/m2 and［Cl-］≥4855 mg/L. Indirect oxidation and direct oxidation played a synergistic role in the degradation process of electrocatalytic oxidation. During the viscosity reduction process of the fracturing flowback fluid，there was a decrosslinking reaction and the crosslinked boron was released.

10.19346/j.cnki.1000-4092.2021.01.031