温控型过硫酸铵纳米胶囊的构筑及对滑溜水残留堵塞物的降解性能  

Fabrication of Thermal-controlled Ammonium Persulfate Nanocapsules and Degradation of Insoluble Residue in Slickwater

作　　者：蒲景阳 李根生[1] 宋先知[1] 罗嗣慧 王斌[1] PU Jingyang;LI Gensheng;SONG Xianzhi;LUO Sihui;WANG Bin(College of Carbon Neutral Energy,China University of Petroleum(Beijing),Beijing 102249,P R of China)

机构地区：[1]中国石油大学(北京)碳中和示范性能源学院,北京102249

出　　处：《油田化学》2024年第4期602-609,共8页Oilfield Chemistry

基　　金：国家自然科学基金“致密油水平井体积压裂温控型纳米胶囊破胶剂构筑与释放调控机理研究”(项目编号52104057);中国石油大学(北京)科研启动基金“双响应聚电解质纳米颗粒构筑及其对CO_(2)驱油埋存一体化作用机理”(项目编号2462023YJRC001);“超临界CO_(2)储层物性变化规律与核磁表征方法研究”(项目编号2462023BJRC002)。

摘　　要：基于致密油体积压裂大背景,以过硫酸铵(APS)破胶剂在远端微纳米裂缝精准调控滑溜水降解反应为目的,研究温控型APS纳米胶囊破胶剂构筑与释放调控中的影响因素。以聚甲基丙烯酸甲酯(PMMA)、二氯甲烷(DCM)、司盘80(Span80)、环己烷(CYH)、泊洛沙姆类三嵌段共聚物(Pluronic P-123)、APS等为原料,通过疏水聚合物壁材在W/O反相微乳液界面化学作用力激励下包覆APS液滴,形成纳米胶囊破胶剂。对纳米胶囊破胶剂的制备条件进行了优选,并通过测定不同温度下纳米胶囊破胶剂对APS的释放率和模拟滑溜水中部分水解聚丙烯酰胺(HPAM)的黏度保留率,分析了温控型纳米胶囊破胶剂可控释放APS和降解HPAM的机理。结果表明,纳米胶囊破胶剂的最佳制备工艺为:反应温度为50℃,DCM和CYH的体积比为1∶1.5,Pluronic P-123的加量为100 mg,PMMA加量为200 mg,芯材APS质量分数为10%,Span80与APS溶液体积比为1∶1。纳米胶囊破胶剂的平均粒径为221 nm,具有较好的球度和理论外壳厚度(13 nm),APS载率为78%。利用APS在特定温度(60~80℃)下对温敏型表面活性剂Pluronic P-123的氧化降解特性,实现纳米胶囊外壳“温控开关”的预置及其对APS释放的精确调控,60、80℃下其对滑溜水中HPAM的降解时间分别为24、12 h。研究成果为解决致密油水平井体积压裂复杂缝网,尤其是远端次级微裂缝系统的压裂液中滑溜水残留堵塞物降解返排瓶颈问题提供了新的途径。To against the backdrop of volume fracturing in tight oil formations,the study aimed to precisely regulate the degradation reaction of slickwater in distal micron sized or nano-sized fractures using ammonium persulfate(APS)as a breaker.It focused on the influencing factors in the construction and release control of thermal-controlled APS nanocapsule breakers.Using poly(methyl methacrylate)(PMMA),dichloromethane(DCM),Span 80,cyclohexane(CYH),triblock copolymer(Pluronic P-123)and APS as raw materials,APS droplets were encapsulated through the interfacial chemical action of hydrophobic polymer wall materials in a W/O inverse microemulsion,forming nanocapsule breakers.The preparation conditions for the nanocapsule breakers were optimized,and then the mechanism of controlled APS release and partially hydrolyzed polyacrylamide(HPAM)degradation by thermal-controlled nanocapsule breakers was analyzed by measuring the APS release rate at different temperatures and the viscosity retention rate of HPAM in simulated slickwater.The results showed that the optimum preparation condition of nanocapsule breakers was obtained as follows:50℃reaction temperature,1∶1.5 volume ratio of DCM and CYH,100 mg Pluronic P-123,200 mg PMMA,10%mass fraction of APS in the core material,and 1∶1 volume ratio of Span 80 and APS solution.The nanocapsule breakers had an average particle size of 221 nm,good sphericity,and a theoretical shell thickness of 13 nm,with an APS loading rate of 78%.By utilizing the oxidative degradation characteristics of APS on the temperature-sensitive surfactant Pluronic P-123 at specific temperatures(60—80℃),a“thermal control switch”for the nanocapsule shell was preset,enabling precise regulation of APS release.The degradation times for HPAM in slickwater at 60℃and 80℃were 24 hours and 12 hours,respectively.The research findings provided a new approach to addressing the bottleneck of degradation and removal of slickwater residue blockages in complex fracture networks,especially in the distal secondary m

关 键 词：过硫酸铵 纳米胶囊 破胶剂 温控 反相微乳液 降解 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]