用于压裂返排液超支化交联剂的合成及其性能评价  

Synthesis and performance evaluation of hyperbranchedcrosslinking agent for fracturing flowback fluid

作　　者：李婧瑶 李伟鹏 姜舒怡 李乔 赵丹[1] 曹清昭 张科良[1] 吴亚[1] LI Jing-yao;LI Wei-peng;JIANG Shu-yi;LI Qiao;ZHAO Dan;CAO Qing-zhao;ZHANG Ke-liang;WU Ya(College of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学化学化工学院,陕西西安710065

出　　处：《应用化工》2023年第11期3095-3100,共6页Applied Chemical Industry

基　　金：陕西省重点研发计划项目(2022GY-162,2019KW-061);陕西省陆相页岩气成藏与开发重点实验室(筹)开放课题。

摘　　要：以聚乙烯亚胺、乙二醇、多元醇、硼砂为主要原料合成超支化聚氨基硼和四乙烯五胺硼酸酯交联剂,并对产物进行结构表征及压裂返排液重复配液性能测试。将0.35%羟丙基胍胶溶液与合成的聚超支化氨基硼交联剂以100∶0.4交联比交联,形成的压裂液冻胶体系在7 min左右达到压裂液黏度要求,在80℃、170 s^(-1)连续剪切70 min时压裂液黏度在100 mPa·s左右,满足行业标准要求(黏度>50 mPa·s)。对此过程进行破胶,破胶液黏度最终为3.2 mPa·s,破胶液中的残渣浓度为198 mg/L。与之相比,四乙烯五胺硼酸酯交联剂体系不能满足返排液的配液要求。用破胶后的压裂返排液再次进行配液,将温度设置到80℃、170 s^(-1)不间断剪切70 min,将压裂液中的黏度调整至50 mPa·s以上,破胶液黏度为3.4 mPa·s。该交联剂使压裂返排液能重复利用。这对节约水资源、降低环境污染具有广阔的工业化前景。The crosslinker of hyperbranched polyaminoboron and tetraethylenepentamine borate was synthesized with polyethylene imine,ethylene glycol,polyol and borax as the main raw materials.The structure of the product was characterized and the performance of the fracturing flowback fluid was tested.The 0.35%hydroxypropyl guanidine gel solution and the synthesized polyhyperbranched aminoboron crosslinker were crosslinked at a cross linking ratio of 100∶0.4,and the formed fracturing fluid gel system reached the fracturing fluid viscosity requirement in about 7 min,the viscosity of fracturing fluid is about 100 mPa·s when it is sheared at 80℃and 170 s^(-1) for 70 min continuously,meeting the requirements of industry standards(viscosity>50 mPa·s).After gel breaking,the viscosity of gel breaking fluid is lower than 3.2 mPa·s,and the concentration of gel breaking fluid residue is 198 mg/L.In contrast,the tetraethylenepentamine borate crosslinker system cannot meet the requirements of liquid preparation.The fracturing flowback fluid after gel breaking is used to prepare the fluid again.The fracturing fluid viscosity is above 50 mPa·s and the gel breaking fluid viscosity is 3.4 mPa·s.The crosslinking agent enables the fracturing flowback fluid to be reused.The technique has a broad industrial prospect for saving water resources and reducing environmental pollution.

关 键 词：超支化聚氨基硼 交联剂 压裂返排液 制备 应用 

分 类 号：TQ028.8[化学工程]