Introduction - IADC.org

DRILLING FLUIDS FL-1. Introduction The principal functions of drilling fluid are to: Drilling fluids are fluids that are used during the drilling of subterranean wells. They provide primary well control of Control subsurface pressures, maintaining well control;. subsurface pressures by a combination of density and any Remove drill cuttings from beneath the bit and circulate additional pressure acting on the fluid column (annular or them to the surface;. surface imposed). They are most often circulated down the Maintain wellbore stability, mechanically and chemi- drill string, out the bit and back up the annulus to the surface cally.

for water-based drilling fluids and Recommend-ed Practice 13B-2 for oil-based drilling fluids. These procedures are revised and extended pe-riodically as improvements are made and new tests are developed. Purpose of testing Routine testing is carried out on drilling fluids to determine the following: the density or mud

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