三异丙醇胺改性黄原胶溶液流变特性
Drilling Fluid & Completion Fluid(2019)
Abstract
为改善黄原胶的流变性能,采用三异丙醇胺与环氧氯丙烷合成多羟基阳离子醚化试剂,以此阳离子醚化试剂对黄原胶(XG)进行改性制得高黏度的多羟基两性黄原胶(TIPA-XG).对XG及TIPA-XG进行了红外谱图、元素分析及XRD表征,研究并比较了TIPA-XG和XG溶液的流变特性,包括稳态黏度、流动曲线、触变性及黏弹性,并进一步研究了其耐温耐剪切性.结果表明,TIPA-XG溶液的黏度较XG显著增加,0.6%TIPA-XG溶液的黏度(320.45 mPa·s)比XG溶液黏度(74.12 mPa·s)增大了332%;XG和TIPA-XG溶液的流动曲线可用非线性共转Jefferys本构方程描述;TIPA-XG溶液的黏弹性及触变性较XG溶液均显著提高;TIPA-XG溶液的耐温性能提高,80℃恒温剪切90 min后,0.6%TIPA-XG的保留黏度(142.88 mPa·s)为0.6%XG保留黏度(63.27 mPa·s)的2.26倍,表明改性后TIPA-XG的耐温性能较XG而言有显著提升.
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