聚酯类颗粒暂堵剂的降解规律及水解机理  

Degradation rule and hydrolysis mechanism of polyester particles temporary plugging agents

作　　者：胡安邦 于小荣[1,2] 彭凯南 杨周 杨欢 苏高申[1] HU Anbang;YU Xiaorong;PENG Kainan;YANG Zhou;YANG Huan;SU Gaoshen(College of Chemical&Environmental Engineering,Yangtze University,Jingzhou 434023,Hubei,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,Beijing 102206,China)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]页岩油气富集机理与高效开发全国重点实验室,北京102206

出　　处：《精细化工》2024年第9期2038-2044,2081,共8页Fine Chemicals

基　　金：国家自然科学基金企业创新发展联合基金项目(U19B6003-05)。

摘　　要：考察了盐酸和NaOH水溶液质量浓度、温度对聚乳酸(PLA)、聚乙交酯(PGA)、聚己二酸-对苯二甲酸丁二醇酯(PBAT)降解性能的影响,通过FTIR、XRD、SEM探究了聚酯类颗粒作为酸压暂堵剂的降解规律和水解机理,并对其封堵性能进行了评价。结果表明,盐酸或NaOH水溶液质量浓度越大,温度越高,PLA、PGA、PBAT完全降解时间越短,在相同质量浓度下,它们在NaOH水溶液中降解比在盐酸中更快;同样条件下,降解速率由大到小的3种聚酯类颗粒暂堵剂排序为PGA>PLA>PBAT。聚酯类颗粒暂堵剂在降解初期,酯基开始水解,颗粒表面出现孔洞,颗粒体积略微减小;随着降解的进行,水解优先发生在无定形区,结晶度增大,羰基指数减小,羟基指数增大,颗粒表面孔洞增多,体积进一步缩小;降解后期,结晶区开始水解,结晶度减小,聚合物分子链大量断裂,直至完全降解。封堵性能(承压能力)由大到小排序为PLA>PGA>PBAT,聚酯类颗粒暂堵剂与水的固液比(g∶L)为150∶1的PLA、PGA、PBAT突破压力分别为11.7、10.9、7.5 MPa;注入聚酯类颗粒暂堵剂的固液比越大,封堵层越致密,承压能力越强。The effects of mass concentration of hydrochloric acid and NaOH aqueous solutions and temperature on the degradation performance of polylactic acid(PLA),polyglycolide acid(PGA)and poly(butylene adipate-co-terephthalate)(PBAT)were investigated.The degradation rule and hydrolysis mechanism of polyester particles as acid pressure temporary plugging agent were analyzed by FTIR,XRD and SEM,with the blocking performance further evaluated.The results showed that larger mass concentration of hydrochloric acid or NaOH solution and higher temperature led to shorter degradation time of PLA,PGA and PBAT,and faster degradation of PLA,PGA and PBAT in NaOH aqueous solution than in hydrochloric acid at the same mass concentration.Under the same conditions,of the three kinds of temporary plugging agents,PGA exhibited the highest degradation rates,PLA the middle,while PBAT the lowest.At the initial stage of degradation,the ester group began to hydrolyze,leading to pores appearing on the particle surface and slight decrease in the particle volume.As degradation progressed,hydrolysis preferentially occurred in the amorphous region,with crystallinity increased,carbonyl index decreased,hydroxyl index increased,surface pores increased,and the volume decreased further.At the later stage of degradation,the crystallization zone began to hydrolyze,the crystallinity decreased,and the molecular chain of the polymer was broken in large numbers until it was completely degraded.The blocking performance(pressure capacity)was ranked as PLA>PGA>PBAT in descending order.The breakthrough pressure of PLA,PGA and PBAT with a solid-liquid ratio(g∶L)of polyester particle temporary plugging agent to water was 11.7,10.9 and 7.5 MPa,respectively.The temporary plugging agent of polyester particles with a larger solid-liquid ratio displayed denser plugging layer and stronger bearing capacity.

关 键 词：聚酯类颗粒暂堵剂 聚乳酸 聚乙交酯 聚己二酸-对苯二甲酸丁二醇酯 降解规律 水解机理 封堵性能 油田化学品 

分 类 号：TE39[石油与天然气工程—油气田开发工程]