"Logging While Drilling" is one form of "measurement while drilling" - to differentiate it from mud logging, wireline logging, etc. See Logging While Drilling.

The maximum rate that a field can be produced or drawn down in pressure without undue stranding of oil that could be lost during more rapid production. Setting the MER required knowledge of fluid and rock properties and well design throughout the formation.

A funnel shaped device of specific volume and shape and outlet that is used to quickly estimate the viscosity of the drilling mud by the time it takes a funnel volume to flow out of the funnel. The Marsh funnel viscosity is reported as the number of seconds required for a given fluid to flow 1 quart through the funnel.

An outer steel shell that connects a drill ship, jackup or floater to the well template on the ocean floor. The drill string is run through the riser and the returning mud and cutting flow u the drill pipe / riser annulus.

An adaptive drilling process used to precisely control the annular pressure profile throughout the wellbore (IADC definition).

The round trip of pulling the drill string from a well and returning it to bottom. Usually done to change or check the bit or to change the BHA.

Mud with a low suspended solids quantity. It may be formulated with a brine with high density created by dissolved salt.

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A LOT is intended to determine the point of leak-off.

Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such content.