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Fishing	A process in which fishing tools are used to retrieve an object, on the bottom of the well.

Flaring	The burning of unwanted gas through a pipe, when there is no way to transport the gas to market and the operator cannot use the gas for another purpose.

Flow rate range	Range within which a MWD tool functions. Above the maximum flow rate, erosion (and consequent tool damage) can occur. Below the minimum flow rate, telemetry information (see telemetry type) may not be transmitted, and/or the tool may not be powered to make any measurements.

Fluid loss	The unwanted migration of the liquids (i.e.: drilling mud or cement slurry) into a formation.

Formation	Stratigraphic: A body of rock strata, of intermediate rank, in the hierarchy of lithostratigraphic units, which is unified with respect to adjacent strata by consisting dominantly of a certain lithologic type or combination of types or by possessing other unifying lithologic features. The formation is the fundamental unit of lithostratigraphic classification. Drilling: A general term applied by drillers without stratigraphic connotation to a sedimentary rock that can be described by certain drilling or reservoir characteristics.

Formation evaluation while drilling / Logging while Drilling (LWD)	The process of collecting, while drilling, petrophysical data that can be used to evaluate the characteristics of a formation. Also called Logging While Drilling (LWD).

Frac job	A well-stimulation method in which liquid under high pressure is pumped down a well to fracture the reservoir rock adjacent to the wellbore. Propping agents (see proppant) suspended in the liquid are used to keep the fracture open (hydraulic fracturing).

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