... with polyanionic cellulose and cmc. Hydroxyethyl cellulose HEC for oil drillingHEC is a kind of non ... stability,its viscosity varies little within PH2-12.HEC offers strong water affinity and water-holding, ... ,is not to be effected by light. HEC after surface treatment disperses in water, does ... 8-10 .In Oil field , Hydroxyethyl cellulose HEC is often used together with polyanionic cellulose and cmc ...