The name used for the derrickman’s working platform, the monkeyboard, when it is located at a height in the derrick equal to three lengths of pipe […]

To flip the spinning chain up from a tool joint box so that the chain wraps around the tool joint pin after it is stabbed into […]

A petroleum- or water-bearing formation of relatively low porosity and permeability.

1) a well about which information is restricted for security or competitive reasons. 2) a section of the hole that, for some reason, is undergauge. For […]

A heavy coupling element for drill pipe. It is made of special alloy steel and has coarse, tapered threads and seating shoulders designed to sustain the […]

An employee of a drilling contractor who is in charge of the entire drilling crew and the drilling rig. Also called a drilling foreman, rig manager, […]

Top drive systems primarily function like a power swivel, applying rotary torque to the drill pipe at the top of the drill string. Some early top […]

An adaptor that attaches to the top drive eliminating floor tongs and manual handling of casing using the power and rotation from the top drive. When […]

The turning force that is applied to a shaft or other rotary mechanism to cause it to rotate or tend to do so. Torque is measured […]

A hydraulic device connected between an engine and a mechanical load such as a compound. Torque converters are characterized by an ability to increase output torque […]

The maximum depth reached in a well.

A working shift for drilling crew or other oilfield workers. The most common tour is 8 hours; the three daily tours are called daylight, evening (or […]