Pressurized mud-cap drilling. One of four common drilling techniques in MPD, used to mitigate fluid loss when drilling in depleted zones or formations with fractures or large voids, such as caverns. All drilling fluids and gases produced are returned to the formation during drilling, maintaining pressure in the formation and the annulus fluid column. This mitigates drilling hazards such as fluid loss, kicks and differential sticking. PMCD deduces costs and NPT, and improves safety.