气田堵水剂用正丁醇醚化酚醛-环氧树脂的制备与性能评价

Preparation and Performance Evaluation of n-Butylated phenolic-epoxy Resin Applied in Gas Field Plugging Agent

张文昌 徐海民 黄 鑫 高笑笑 刘汉超 黄光速 郑 静 吴锦荣

ZHANG Wenchang XU Haimin HUANG Xin GAO Xiaoxiao LIU Hanchao HUANG Guangsu ZHENG Jing WU Jinrong

为改善油气田环氧堵水剂低黏度和高强度之间的矛盾，以双酚F型环氧树脂（B）为基体、正丁醇醚化酚醛树脂（BPF）为交联剂和稀释剂、2-乙基-4-甲基咪唑（EMI）作为促进剂制得一种低黏度高强度堵水剂。研究了BPF的结构及其对固化体系黏度、固化时间和力学强度的影响。结果表明，BPF可显著降低固化体系的黏度，当BPF质量分数达到80%时，B/BPF体系的黏度可低至50 mPa·s，满足向气田深处输送的流动性要求。EMI可明显促进体系的固化，缩短凝胶化时间。通过调节EMI的加量可使体系的固化时间在1~7 h内可控。B/BPF体系具有较高的交联密度，力学性能良好，压缩强度可达129 MPa。B/BPF固化体系具有良好的水/酸耐受性与热稳定性，可以在地层高温、高矿化度的苛刻条件下长期稳定存在。B/BPF堵剂在固化前具有较低的黏度，固化后具有较高的强度，满足气井堵水剂的使用要求。

In order to improve the contradiction between low viscosity and high strength of epoxy water plugging agent in oil and gas fields，a low viscosity and high strength material used in gas field plugging agent was prepared with bisphenol F epoxy resin（B）as matrix，n-butylated phenolic resin（BPF）as crosslinker and diluent，and 2-ethyl-4-methidazole（EMI）as accelerant. The structure of BPF and its effect on the viscosity，curing time and mechanical strength of the system were studied. The results showed that the viscosity of the curing system could be significantly reduced by the addition of BPF. When the mass fraction of BPF reached 80%，the viscosity of B/BPF system was 50 mPa·s，which completely met the need of its transportation to the depth of gas field. EMI could obviously promote the curing of the system and shorten the gelation time. By adjusting the content of EMI，the curing time of the system could be adjusted within 1—7 h. B/BPF system had high crosslinking density，which endowed the system with excellent mechanical property，and its compression strength was up to 129 MPa. In addition，B/BPF system had decent water/acid resistance and thermal stability，and could stably exist for a long time under the harsh conditions of high temperature and high salinity. B/BPF plugging agent had low viscosity before solidification and high strength after solidification，which met the application requirement of water plugging agent for gas well.

10.19346/j.cnki.1000-4092.2019.03.012