Old-style tap with longitudinal grooves across the threads. See tap, taper tap.

Water inherent to the producing formation; or fossil sea water trapped in the pore spaces of sediments during their deposition.

To overcome pressure in a well by use of mud or water so that surface connections may be removed.

To enlarge the wellbore below the casing.

The oil company in charge of development and production in an oilfield in which several companies have joined to produce the field.

Also called filter cake or mud cake. See filter cake.

A well that has blown out of control and from which oil, water, or gas is escaping with great force to the surface. Also called a gusher.

Abbr. Azimuth

(api) a trade association founded in 1919 with offices in washington, dc, usa. The api is sponsored by the oil and gas industry and is recognized worldwide. Among its long-term endeavors is the develo [..]

Or aof. The maximum rate that a well can produce at the lowest possible bottom hole pressure.