多重物理交联强韧凝胶的合成及其油气封堵性能  

Synthesis and oil/gas plugging performance of tough hydrogels cross-linked via multiple weak physical interactions

作　　者：王涛[1] 陶媛 刘小军 贺永殿 李论 徐昆[2] Wang Tao;Tao Yuan;Liu Xiaojun;He Yongdian;Li Lun;Xu Kun(Tuha Oilfield Engineering Research Institute of Petrochina,Hami Xinjiang 838202,China;Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun Jilin 130022,China)

机构地区：[1]中国石油吐哈油田公司工程技术研究院,新疆哈密838202 [2]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《石油化工》2018年第1期61-66,共6页Petrochemical Technology

基　　金：国家自然科学基金项目(51673191)；吉林省科技发展计划项目(20160101306JC)。

摘　　要：以丙烯酰胺、丙烯酸、2-丙烯酰氨基-2-甲基丙磺酸和阳离子单体丙烯酰氧乙基三甲基氯化铵为功能性单体,以十一烯酸为疏水单体,以羧甲基纤维素为接枝骨架,通过原位接枝共聚制备接枝聚合物基质作为凝胶基液。然后以硫酸铬钾作为金属交联剂,通过金属配位键、静电作用、疏水缔合作用及氢键的协同交联效应制备了高性能凝胶材料。利用FTIR,TG等方法分析了接枝聚合物的结构,考察了凝胶的机械性能和油气封堵性能。实验结果表明,当m(交联剂)∶m(凝胶基液)=8∶100、凝胶基液的质量分数为7.0%(w)时,凝胶拉伸强度最高可达到16 kPa。当m(交联剂)∶m(凝胶基液)在(7∶100)^(10∶100)的范围内时,压缩强度远高于25 MPa。凝胶材料耐压差封堵能力可达10 MPa(基于100 m),利用强韧性凝胶材料可实现井下油气的高效封堵,对于保证油井施工安全和井筒完整性具有重要意义。The grafting copolymers have been synthesized as gelators by in-situ grafting copolymerization,in which acrylic acid,acrylamide,2-acrylanmido-2-methylpropanesulfonic acid and cationic monomer as functional monomers,undecylenic acid as hydrophobic monomer,and modified cellulose as grafting backbone.The tough hydrogel materials can be prepared with chromium potassium sulphate as metal cross-linker.The structure of grafting copolymers was characterized by FTIR and TG.The mechanical and oil/gas plugging performance of hydrogel materials are also investigated.The results show that the tensile strength of hydrogel materials with 7.0%(w)grafted copolymer can be up to 16 kPa when m(cross-linker)∶m(gel base)is 8∶100.Meanwhile,when the cross-linker content is between 7∶100 and 10∶100,their compressive strength can be above 25 MPa.The excellent mechanical and oil/gas plugging performance of hydrogel materials should be contributed to the synergic cross-linking effect of multiple weak physical interactions,including metal coordination,hydrophobic associating interaction,electrostatic interaction and H-bonding,etc.On the other hand,it should be also noted that their oil/gas plugging ability can be reached to 10 MPa(based on the 100 m)when they are utilized to block the gas.As a novel oil/gas plugging materials,the tough hydrogel materials are of great significance in improving wellbore integrity and ensuring the safety of oil well construction.

关 键 词：羧甲基纤维素 原位接枝共聚 物理交联 凝胶 油气封堵 

分 类 号：TQ316.3[化学工程—高聚物工业]