压裂返排液中残余硼交联剂掩蔽方法

发布时间：2018-05-12 23:13

本文选题：多元醇 + α-羟基羧酸盐　；参考：《石油钻采工艺》2017年05期

【摘要】：为处理胍胶压裂返排液中存在的残余硼交联剂,达到返排液重复利用的目的,通过考察多元醇和α-羟基羧酸盐对硼酸的络合作用,筛选出了甘露醇、木糖醇、葡萄糖酸钠等3种高效配体,并对比了其掩蔽残余硼交联剂的应用效果。实验结果表明:3种配体与硼酸在常温下均可形成稳定络合物,能有效抑制硼酸水解成硼酸根离子;在络合反应过程中,配体均与硼酸先生成摩尔比为1∶1的过渡态络合物,再进一步与游离配体反应生成2∶1络合物;随配体/硼酸摩尔比增大,络合效率逐渐提高,当摩尔比不小于2.5时,硼酸能被完全络合;络合物在碱性和高温条件下均具有较高稳定性,不会释放硼酸或硼酸根离子。利用甘露醇和葡萄糖酸钠为掩蔽剂,对返排液中残余硼交联剂进行有效掩蔽后可以直接配制胍胶冻胶压裂液,其耐温耐剪切能力和破胶性能与清水配制压裂液相当,可用于胍胶压裂返排液的重复利用。
[Abstract]:In order to deal with the residual boron crosslinking agent in guanidine gel fracturing effluents and achieve the purpose of reuse, mannitol and xylitol were screened by investigating the complexation of polyol and 伪 -hydroxycarboxylate on boric acid. Three kinds of ligands such as sodium gluconate were used to screen the residual boron crosslinker. The experimental results show that the three ligands can form stable complexes with boric acid at room temperature, which can effectively inhibit the hydrolysis of boric acid into borate ions, and in the process of complex reaction, the ligand and boric acid have a transition complex with a molar ratio of 1:1. When the molar ratio of ligand to boric acid increases, the complexation efficiency increases gradually, and when the molar ratio of boric acid is not less than 2.5, boric acid can be completely complexed. The complex has high stability under both alkaline and high temperature conditions and does not release boric acid or borate ions. Using mannitol and sodium gluconate as masking agents, guanidine gel fracturing fluid can be prepared directly after the effective masking of residual boron crosslinking agent in reflux fluid. It can be used for the reuse of guanidine gel fracturing fluid.
【作者单位】：中国石油川庆井下作业公司四川川庆井下科技有限公司;中国石油川庆井下作业公司;
【基金】：国家科技重大专项“大型油气田及煤层气开发”子课题“废弃物处理与利用技术”(编号:2016ZX05040-003)
【分类号】：TE357.12

【相似文献】