Downhole Pumping MPD

A pump of some design is used downhole to apply upward lift to annulus returns; to offset annulus friction pressure when circulating, to return riserless drilled mud and cuttings to the rig, or mid riser to reduce the hydrostatic head of mud and cuttings in ultra-deep water.

Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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