滑溜水减阻剂的绿色配体-Fenton降黏试验*

Experiment on Reducing Viscosity of Drug Reduction Agents in Slickwater Using Environment-friendly Ligand-Fenton Method

谢 娟 袁梦瑶 惠海伟 王新强 屈撑囤

XIE Juan YUAN Mengyao HUI Haiwei WANG Xinqiang QU Chengtun

滑溜水减阻剂EM50聚合物给压裂返排液处理带来一定难度。本文采用绿色螯合剂亚氨基二琥珀酸四钠（IDS）配体-Fenton法对减阻剂EM50进行氧化降黏处理。在单因素试验基础上，采用响应面法（RSM）研究影响降黏效果的3个主要因子n（IDS）∶n（Fe（Ⅱ））、Fe（Ⅱ）加量、H2O2加量的最佳水平及其交互作用。结果表明，在pH中性条件下，影响氧化降黏的主次因素依次为：n（IDSTA）∶n（Fe（Ⅱ））、Fe（Ⅱ）加量、H2O2加量；3个因素中，n （IDSTA）∶n（Fe（Ⅱ））与 Fe（Ⅱ）加量两个因素的交互作用显著；根据模型预测最优反应条件为：n（IDS）：n（Fe（II））=1.4，c（Fe（II））=0.3mmol/L，φ（H2O2）=0.5%。在最优反应条件下质量分数0.1%的EM50溶液的平均降黏率为84.01%，与预测值相对偏差2.62%，说明建立的模型切实可行。降黏后进行混凝处理，压裂返排液SS、COD去除率分别为94.9%、89.2%。图7表4参26

EM50 polymer used in slickwater as drag reduction agents（DRA）makes the treatment of the fracturing flowback fluid more difficult. In this paper，Ligand-Fenton composed of environment-friendly chelating agent tetrasodium iminodisuccinate（IDS） and Fenton was used to reduce viscosity of EM50 solution. On the basis of single-factor design，response surface methodology （RSM）was used to research the best level and mutual effect of n（IDS）：n（Fe（Ⅱ）），Fe（Ⅱ）and H2O2 dosage affected on viscosity-reducing rate. The results showed that under neutral pH，the order of three influencing factors on the viscosity-reducing rate was n（IDS）∶n（Fe（Ⅱ））>Fe（Ⅱ）dosage>H2O2 dosage. Among these factors，Interaction between n（IDS）∶n（Fe（Ⅱ）），Fe（Ⅱ） had a signifigant impact on the oxidation efficiency. the predicted optimal conditions was obtained as follows：n（IDS）∶n（Fe（II）= 1.4，c（Fe（II））=0.3 mmol/L and φ（H2O2）=0.5%. Under this conditions，the average viscosity-reducing rate of the EM50 solution with mass fraction of 0.1% was 84.01%，which is compared with resulting in a final response，the relative deviation to the predicted value was 2.62%，indicating that the model was reliable and accurate. When being treated using chemical coagulation after viscosity reducing，the removal rates of SS and COD in fracturing fluid recovery were 94.9% and 89.2%，respectively

10.19346/j.cnki.1000-4092.2020.01.028