Laboratory Study and Field Application of Poly-alco-hol Drilling Fluid

Properties of poly-alcohol drilling fluid are analyzed based on laboratory study and field application.It has supreme temperature resisting property,thermal stability,lubricating property and collapse -preventing property.High temperature and high pressure filtration loss of the drilling fluid are lowered by using the turbidity point ef-fect to meet the requirements of drilling of deep wells,highly-deviated and extended reach directional wells.It also has positive significance of environmental protection.