Pre-gelatinized starch is an effective and economical fluid loss agent in water based drilling fluids, which is a starch derivative. It is not bacterial degradation at 120℃, environmentally acceptable and non-toxic.

Modified Starch can produce a thin, slick, tough filter cake and promote faster penetration rates with friction reducer. It can be used in all kinds of drilling fluid system. Pre-gelatinized starch is also sometimes "pregelatinized" to make them easier to dissolve during product manufacture. Modified starch is widely used in oil drilling, textile, paper and food industries.