钻井液与完井液2018，Vol.35Issue(1)：119-123,5.DOI:10.3969/j.issn.1001-5620.2018.01.023
黄原胶及其衍生物的耐温耐剪切性能
Temperature Resistance and Shear Resistance of Xanthan Gum and Its Derivatives
摘要
Abstract
Temperature resistance and shear resistance are important parameters of fracturing fluid and the one the key factors to the success of fracturing job.To widen the application of non-crosslinking xanthan gum fracturing fluids and improve their job performance,study has been conducted on the effects of chemical modification and molecular conformation of xanthan gum (XG) on the high temperature resistance and shear resistance of XG solution.It was found that at low temperatures,chemical modification can remarkably enhance the temperature resistance and shear resistance of XG.At high temperatures,chemical modification plays almost no role in enhancing the temperature resistance and shear resistance of XG.Chemical modification improves the networking structure of XG molecules and the viscoelasticity of XG solution.Addition of salts (ions) into XG solution accelerates the formation of double helix conformation of XG molecules.The combined action of chemical modification and salts on XG remarkably improves the temperature resistance,shear resistance and suspending capacity at elevated temperatures.Comparison of rheology before and after shearing at 180 ℃ indicated that salts can enhance the viscoelasticity,thixotropy and apparent viscosity of XG solution at elevated temperatures,improving its sand carrying capacity,and widening the application of non-crosslinking fracturing fluids formulated with XG and modified XG.It is concluded that combined action of chemical modification and salts greatly improves the rheology,temperature resistance and shear resistance of XG solution,thereby widening the application of non-crosslinking fracturing fluids formulated with XG,especially the XG fracturing fluids mixed with seawater.关键词
黄原胶/耐温耐剪切性能/化学改性/盐效应Key words
Xanthan gum/Temperature resistance and shear resistance/Chemical modification/Salt effect分类
能源科技引用本文复制引用
刘双,张洪,邱晓惠,方波,卢拥军,翟文..黄原胶及其衍生物的耐温耐剪切性能[J].钻井液与完井液,2018,35(1):119-123,5.基金项目
国家高技术研究发展计划(863计划)课题“致密砂岩气藏低伤害压裂液体系研究与应用”(2013AA064801). （863计划）
