A substance or composition that, when added to a liquid, increases the spreading of the liquid on a surface or the penetration of the liquid into a material.

A borehole; the hole drilled by the bit.

A wellbore may have casing in it or it may be open (uncased); or part of it may be cased, and part of it may be open.

Also called a borehole or hole.

The amount by which drilling fluid density is reduced by entrained formation fluids or air.

To increase the weight or density of drilling fluid by adding weighting material.

1.

In mud terminology, refers to the density of a drilling fluid.

2.

Of a measurement, expresses degree of confidence in result of measurement of a certain quantity compared with result of another measurement of the same quantity.

Water put into an empty string of pipe in a wellbore to prevent the pipe from being crushed by pressure in the annulus.

A device used in fishing for drill pipe.

If the upper end of the lost pipe is leaning against the side of the wellbore, the wall hook centers it in the hole so that it may be recovered with an overshot, which is run on the fishing string and attached to the wall hook.

A member of a well-servicing crew.

1.

The high-pressure spraying of the crude oil cargo to dislodge or dissolve clingage and sediment from the walls, cross members, and lines in the compartments of a vessel during the unloading operation.

2.

The use of a high-pressure water stream to dislodge clingage and sediment from the bulkheads, bottoms, and internal structures of a vessel’s cargo tanks.

The adhesion of a liquid to the surface of a solid.

A hole drilled in the earth for purpose of (1) finding or producing crude oil or natural gas; or (2) providing services related to the production of crude oil or natural gas.

Pertaining to the time when drilling or completion operations are suspended so that the cement in a well can harden sufficiently.