A barrier is defined as “a component or practice that contributes to the total system reliability by preventing formation fluid or gas flow” (API RP 96) […]

A fishing accessory run above a bit or a mill to recover small, non-drillable pieces of metal or junk in a well.

A specific layer of earth or rock that presents a contrast to other layers of different material lying above, below, or adjacent to it.

A short piece of pipe, expanded, or belled, at the top to guide tools into the hole. Usually has side connections for the fill-up and mud […]

A flexible band or cord connecting and wrapping around each of two or more pulleys to transmit power or impart motion.

A finely powdered gray material used in preparing drilling mud. Usually referred to on the rig as “gel”.

The cutting or boring element used in drilling oil and gas wells. The bit consists of a cutting element and a circulating element. The circulating element […]

A heavy plate that fits in the rotary table and holds the drill bit while it is being made up in or broken out of the […]

A report that lists each bit used during a drilling operation, giving the type, the footage it drilled, the formation it penetrated, its condition, and so […]

An integral part of a blowout preventer, which serves as the closing element on an open hole. Its ends do not fit around the drill pipe […]

Any assembly of pulleys on a common framework; in mechanics, one or more pulleys, or sheaves, mounted to rotate on a common axis. The crown block […]

The discharge pipe from a well being drilled by air drilling. The blooey line is used to conduct the air or gas used for circulation away […]