Oil Drilling Fluids

1) Solids-free non-dispersed polymer drilling fluid Basic components: polyacrylamide or multiple vinyl copolymer flocculant, inorganic salt, etc. Features: flocculant can effectively flocculate cuttings generated in the drilling process. 2) Anionic polymer drilling fluid Basic components: multiple vinyl copolymers, hydrolyzed polyacrylonitrile, partially hydrolyzed polyacrylamide, etc. Features: high molecular weight polymer encapsulates clay or cuttings and provides viscosity and shear force required for drilling fluid; medium and low molecular weight polymers can control filtrate loss, viscosity and shear force. 3) Cationic polymer drilling fluid Basic components: high and low molecular weight cationic polymer, starch, etc. Features: cationic polymer has the highly powerful ability of st