1. n. [Drilling Fluids]

A formal plan developed for a specific well with predictions and requirements at various intervals of the wellbore depth. The mud program gives details on mud type, composition, density, rheology, filtration and other property requirements and general and specific maintenance needs. Mud densities are especially important because they must fit with the casing design program and rock mechanics required in openhole to ensure wellbore pressures are properly controlled as the well is drilled deeper.

See related terms: filtration,  hydrostatic pressure,  mud weight,  rheology