18 July 2017
Any one of several types of valve installed in the drill stem to prevent a blowout through the stem. Flow is possible only downward, allowing mud […]
18 July 2017
A device or assembly of devices designed for one or more of the following functions: to measure operating variables (such as pressure, temperature, rate of flow, […]
25 July 2017
An enclosure for remotely controlling equipment. Generally (but not always) used to describe a Driller’s cabin. The enclosure typically includes both controls and instrumentation at an […]
18 July 2017
The string of casing set in a well after the surface casing but before production casing is set to keep the hole from caving and to […]