摘要
固井工程是石油或天然气开采过程中一个很重要的环节,其成功与否关系着油气开采能否顺利进行.随着固井技术的发展,对固井水泥的性能要求越来越高,为了改善其性能,需要加入一些外加剂,如胶乳、降失水剂、缓凝剂和分散剂等.为了解决传统丁苯胶乳分散性差、流动性差和不耐高温等问题,本文采用种子乳液聚合的方式,选用两种不同的功能单体苯乙烯磺酸钠(SSS)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS),与苯乙烯、液体聚丁二烯进行共聚,制得了两种具有抗温抗盐性的功能性胶乳,使用了傅里叶变换红外光谱(FT-IR)、纳米粒度分析仪、热重分析仪(TG)和场发射透射电子显微镜(TEM)对两种胶乳进行了表征,并对由两种胶乳改性的水泥的性能进行了水泥浆流动度、水泥石抗折抗压强度等测试.水泥浆流动度测试结果表明两种胶乳的分散性能良好,水泥浆流动性能好;热失重测试表明两种胶乳能承受400℃高温.同时通过水泥水化热测定对由胶乳改性的水泥水化过程进行了探究,证明了其优良的分散性及力学性能是由于胶乳分子上的负电荷对水化产物中所包含的Ca^(2+)的吸附作用,使得其结构更加致密,从而提高水泥石的性能,而且使用SSS作为功能单体时,由于其更好的吸附作用,相对于AMPS具有更好的耐温性、分散性、流动性.
Cementing engineering is a very important part of the oil or natural gas exploitation process. The success of the exploitation process is related to whether oil and gas mining can proceed smoothly. With development in cementing technology,the performance requirements of oil well cement continues to increase. To improve the performance of oil well cement,some additives,such as latex,fluid loss agent,retarder,and dispersant are often added. To solve the problems of poor dispersion,fluidity and high-temperature resistance of traditional styrene-butadiene latex, two different functional monomers,namely,sodium styrenesulfonate(SSS)and 2-Acrylamido-2-methylpropane sulfonic acid(AMPS) were selected for copolymerization with styrene and liquid polybutadiene by seed emulsion polymerization. Two types of latexes were characterized by Fourier transform infrared spectroscopy(FT-IR), nanoparticle size analysis,thermal gravimetric analysis(TG),and field-emission transmission electron microscopy( TEM),and the fluidity of cement paste as well as the flexural and compressive strengths of cement stone were examined. Results of fluidity test show that both types of latexes disperse well and possess good fluidity. Results of thermogravimetry show that these latexes can remain stable in an approximately 400℃ temperature environment. In addition,the results of the study of the hydration process of a cement modified by latex via cement hydration heat measurement proved that excellent dispersibility and mechanical properties of cement were due to the adsorption of Ca2+contained in the hydration product by the negative charge on the latex molecule,which made its structure denser,and thus,improved the properties. Moreover,SSS used as a functional monomer has better temperature resistance,dispersion,and fluidity as compared to AMPS because of better adsorption.
作者
郭锦棠
王泽辉
杜江波
胡苗苗
徐杨
Guo Jintang;Wang Zehui;Du Jiangbo;Hu Miaomiao;Xu Yang(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2019年第8期843-848,共6页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51874210)~~
