18 July 2017SubstructureThe foundation on which the derrick or mast and usually the drawworks sit. It contains space for storage and well control equipment.
18 July 2017Suction tankThe mud tank from which mud is picked up by the suction of the mud pumps. Also called a suction pit.
18 July 2017Surface casingThe first string of casing (after the conductor pipe) that is set in a well. It varies in length from a few hundred to several thousand […]
18 July 2017Swabbing1) operation of a lifting device on a wireline to bring well fluids to the surface when the well does not flow naturally. This is a […]
18 July 2017SwivelA rotary tool that is hung from the rotary hook and traveling block to suspend the drill stem and to permit it to rotate freely. It […]
18 July 2017SynclineA down-warped, trough-shaped configuration of folded, stratified rocks. Compare Anticline.