API is an effective and economical fluid loss agent in water based drilling fluids, which is a starch derivative.

Modified potato starch is used for filtration control in all types of water base drilling fluids ranging from fresh to salt saturated waters. It also has shale inhibitive characteristics. It meets or exceeds API 13A specifications. Its thermal stability is up to 120C(248F). It is also can be bacterial fermentation.

CMS is an effective and economical fluid loss agent in water based drilling fluids, which is a sodium carboxymethyl starch polysaccharide derivative.

Polyanionic Cellulose PAC is soluble in water to form thick liquid. It has good heat-stability and high resistance to salt.

Sodium Carboxymethyl Cellulose CMC for petroleum drilling: well mud is the necessary condition while drilling. Mud¡¯s gravity, viscosity, thixotropic property and water-loss amount change according to area, depth of well and different mud.