A quick lesson in drilling engineering terminology
A ‘drill string’ on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud or foam pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied to the assembled collection of the drill pipe, drill collars, tools, and drill bit.
In the oil and gas industry, the term ‘wireline’ usually refers to a cabling technology used by operators of oil and gas wells to lower equipment or measurement devices into the well for the purposes of well intervention, reservoir evaluation, or pipe recovery. There’s a lot of pressure involved. The drill pipes are screwed together at a torque of 40,650Nm.
Below: Tools being lowered through the valves