18 July 2017
A large load-bearing structure, usually of bolted construction. In drilling, the standard derrick has four legs standing at the corners of the substructure and reaching to […]
18 July 2017
The crew member who handles the upper end of the drill string as it is being hoisted out of or lowered into the hole. He or […]
18 July 2017
A centrifugal device for removing sand from drilling fluid to prevent abrasion of the pumps. It may be operated mechanically or by a fast-moving stream of […]
18 July 2017
A centrifugal device for removing very fine particles, or silt, from drilling fluid to keep the amount of solids in the fluid at the lowest possible […]