A situation in which the formation pressure is very close to the fracture pressure. Often encountered in deepwater, narrow drilling windows complicate drilling operations, requiring multiple […]

Narrow margin drilling practices refer to practices and procedures adopted when there is only a small margin (or window) between either: A. The lowest measured (or […]

Highly compressible, highly expansible mixture of hydrocarbons with low specific gravity and occurring naturally in gaseous form. Besides hydrocarbon gases, natural gas may contain appreciable quantities […]

A globe valve that incorporates a needlepoint disk to produce extremely fine regulation of flow.

A test in which the hydrostatic pressure is reduced such that the net differential pressure direction is from the formation into the wellbore. (Duplicate of term […]

A test in which the hydrostatic pressure is reduced such that the net differential pressure direction is from the formation into the wellbore.

A tubular pipe fitting threaded on both ends and less than 12 inches long.

A material-man whose duty it is to procure and deliver to the drilling rig the necessary tools and equipment to carry on the work.

Disassembly of well control equipment and lines for removal.

A non-shearable is normally accepted as a component of the drillstring: BHA or a large size casing string that cannot be sheared under expected wellbore conditions […]

The smooth, uninterrupted circulation of drilling fluid down the drill stem, out the bit, up the annular space between the pipe and the hole, and back […]

A small spout to direct the flow of fluid efficiently.