Dating someone who works on an oil rig
Small mobile drilling rigs are also used to drill or bore piles.
Rigs can range from 100 ton continuous flight auger (CFA) rigs to small air powered rigs used to drill holes in quarries, etc.
Typically this is done when changing a drill bit or when "logging" the well.
A single joint of pipe is typically some 30 feet long.
Directional drilling is done with a mud motor on the Bottom hole assembly (BHA).
Heavy iron bits were attached to long bamboo cables suspended from bamboo derricks and then were repeatedly raised and dropped into a manually dug hole by having two to six men jumping on a lever.Some light duty drilling rigs are like a mobile crane and are more usually used to drill water wells.Larger land rigs must be broken apart into sections and loads to move to a new place, a process which can often take weeks.In early oil exploration, drilling rigs were semi-permanent in nature and the derricks were often built on site and left in place after the completion of the well.In more recent times drilling rigs are expensive custom-built machines that can be moved from well to well.