A method of connecting the bit and the rods or cable in an apparatus for drilling rocks by impact, by means of which at each up-stroke a jar of…

Oil Industry. A spell of drilling with a particular bit; (also) the distance drilled during such a spell.

In extended use and figurative, esp. (Mining and Oil Industry) an act of withdrawing and replacing a drill pipe.

Oil Industry. Detonation of an explosive charge in a well to increase the flow of oil or gas. Cf. shoot, v. 34.

The action of swab, v.1; cleaning with (or as with) a swab or mop; the use of a swab or swabs. Also concrete (see quot. 1891).

The process or action of acidizing something, esp. a well or a rock formation; an instance of this.

(see quot. 1938).

examination of the drilling mud coming out of a borehole for signs of oil or gas or other indications of the strata being drilled.

Oil Industry. The action or an act of drilling again in a hole, after the drilling bit has been removed; renewed drilling.

Oil Industry. (See quot. 1975.)

Oil Industry. The manoeuvring of an offshore oil platform into an upright position.