18 July 2017
The mass or weight of a substance per unit volume. Specific gravity, relative density, and API gravity are other units of density. See API gravity, specific […]
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 […]