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.

The pressure at the bottom of a well when the surface valves on the well are completely closed. It is caused by formation fluids at the […]