Phospholipids Polysaccharide and Its Application as Inhibitive Drilling Fluid Additive

For the improvement of solubility and the performance of the sample that derived plant polysaccharide(SJ) in drilling fluid based on water, which was improved by phosphoric esterification with phospholipids reagent. The conditions of the reaction were discussed by orthogonal ways in four factors and three levels, and the optimization of handling approaches were found out: With pH=12 at the temperature of 80., the mass ratio between phospholipids agent and SJ is 0.1g/1g. The viscosity about the system added by sulfonated SJ (SJP) was extremely increased and below 120 degrees C, rheological properties had a slight change. The inhibitive ability of SJP is assessed by the mud ball immersing tests and clay-swelling experiments, that is apparently better than SJ and even 4wt% KCl in free water.