25 July 2017

Stripping

The process of running the drillstring into or out of the well under “Kick” conditions (see Kick). Normally through a closed annular BOP but may be […]
18 July 2017

Structural trap

A petroleum trap that is formed because of deformation (such as folding or faulting) of the reservoir formation. Compare stratigraphic trap.
18 July 2017

Stuck pipe

Drill pipe, drill collars, casing, or tubing that has inadvertently become immovable in the hole. Sticking may occur when drilling is in progress, when casing is […]
18 July 2017

Sub

A short, threaded piece of pipe used to adapt parts of the drilling string that cannot otherwise be screwed together because of differences in thread size […]