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Limestone

A sedimentary rock composed mainly of calcium carbonate.

Lithology

The details of rock’s characteristics.

Location

The well site or surface location where a well is to be drilled.

Log

A record of activity or results of plans or surveys. In drilling a well there a number of different kinds of logs, e.g. Downhole density logs, mud logs, driller’s logs etc.

Lost Circulation

An interruption in the circulation of drilling mud caused by the mud entering a porous zone, fracture or cavity, such that the mud fails to return to the surface.

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