ST-1 is a multifunction seawater drilling fluid additive which is synthesized by vinyl radical binary monomer and natural macromolecule. It is used to reduce filtrate loss and prevent bore hole wall sloughing and reduce sticking risk in seawater based mud. ST-1 is suitable to any type of well and applicable for freshwater, seawater and saturated salt water drilling fluid with pH of 7 to 9.5.
