新型温敏共聚物P(NVCL-co-DMAM)的研制及其对水基钻井液低温流变性调控  

Synthesis and evaluation of a temperature-sensitive copolymer P(NVCL-co-DMAM)for its application in controlling low-temperature rheology of water-based drilling fluid

作　　者：丁廷稷 王瑞和[1,3] 徐加放 李杰[4] 王继鹏 王潇辉[1] 薛迦文 袁石 杨晓龙 DING Tingji;WANG Ruihe;XU Jiafang;LI Jie;WANG Jipeng;WANG Xiaohui;XUE Jiawen;YUAN Shi;YANG Xiaolong(School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,China;Shandong Key Laboratory of Oilfield Chemistry(China University of Petroleum(East China)),Qingdao 266580,China;Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao 266580,China;China Petroleum Technology&Development Corporation(CPTDC),Beijing 100028,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]山东省油田化学重点实验室(中国石油大学(华东)),山东青岛266580 [3]非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛266580 [4]中国石油技术开发有限公司,北京100028

出　　处：《中国石油大学学报（自然科学版）》2021年第6期87-94,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(U1762212,51874343);中国石油大学(华东)研究生创新工程(YCX2019012)。

摘　　要：温度敏感型聚合物可以随温度变化而改变分子构象,随之改变其亲疏水特性,从而对钻井液内固相颗粒与聚合物之间的网状结构做出调整。采用温敏单元N-乙烯基己内酰胺(NVCL)和N,N-二甲基丙烯酰胺(DMAM)为原料,偶氮二异丁腈(AIBN)为引发剂,合成一种新型温敏共聚物P(NVCL-co-DMAM),表征其分子结构与分子质量及其分布,并研究矿化度、pH值和共聚物质量分数对其低临界溶解温度(LCST)的影响。利用共聚物的温敏特性,研究其对水基钻井液低温流变性的调控能力。结果表明:P(NVCL-co-DMAM)可在4~60℃对深水水基钻井液的流变性进行有效调控,同时该聚合物具有较强的耐温、抗盐能力,可经受钻井液的温度交替变化。The molecular conformation and hydrophilicity/hydrophobicity of temperature-sensitive polymers can be changed at different temperatures,which can be used as additive in drilling fluid to adjust the network structure between clay particles and polymers and improve its rheological property.In this study,a novel temperature-sensitive copolymer P(NVCL-co-DMAM)was synthesized by using temperature-sensitive unit N-vinylcaprolactam(NVCL)and N,N-dimethylacrylamide(DMAM),initiated by azobisisobutyronitrile(AIBN).Its molecular structure,molecular weight and distribution were characterized.The effects of salinity,pH value and copolymer concentrations on lower critical solution temperature(LCST)were studied.Based on the temperature-sensitive property of the copolymer,its capability to control the low-temperature rheology of water-based drilling fluid was evaluated.The results show that P(NVCL-co-DMAM)can effectively control the rheology of deep-water water-based drilling fluid in the range of 4-60℃.The copolymer has high temperature and salt tolerance,which can withstand the large temperature alternation during deep-water drilling process.

关 键 词：深水钻井液 温敏共聚物 低临界溶解温度 低温流变性 

分 类 号：TE254.1[石油与天然气工程—油气井工程]