A pit that is dug in the earth for the purpose of receiving mud returned from the well and allowing the solids in the mud to […]

Shortened form of shale shaker. See Shale Shaker.

See shaker tank.

The mud tank adjacent to the shale shaker, usually the first tank into which mud flows alter returning from the hole. Also called a shaker pit.

A fine-grained sedimentary rock composed mostly of consolidated clay or mud. Shale is the most frequently occurring sedimentary rock.

A vibrating screen used to remove cuttings from the circulating fluid in rotary drilling operations. The size of the openings in the screen should be carefully […]

Shallow hazards are adverse drilling subsurface conditions that may be encountered prior to the setting of the first pressure containment string and the emplacement of the […]

A relatively small container of high explosive that is loaded into a perforating gun. On detonation, the charge releases a small, high-velocity stream of particles (a […]

The component in a blowout preventer that cuts, or shears, through drill pipe and forms a seal against well pressure. Shear rams are used in floating […]

1) a grooved pulley. 2) support wheel over which tape, wire, or cable rides.

Established at the bottom end of the conductor casing by cementing. See leak off test and conductor casing.

The appearance of oil or gas in cuttings, samples, or cores from a drilling well.