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A rotary drilling method in which drilling occurs through the action of the drill steel rotating while pressed against the rock.



Related Terms

DRILL ROD

The long rod that drives the drill bit in drilling boreholes.

HOLLOW-ROD DRILLING

A modification of wash boring in which a check valve is introduced at the bit so that the churning action may be also used to pump the cuttings up the drill rods.

DRILLING TIME

  1. The time required in rotary drilling for the bit to penetrate a specified thickness (usually 1 foot) of rock. 2. The actual time the drill is operating.

DRILL PRESS

A drilling machine in which a vertical drill moves into the work, which is stationary.

FEED PRESSURE

Total weight or pressure, expressed in pounds or tons, applied to the drilling stem to make the drill bit cut and penetrate the geologic, rock, or ore formation.

HIGH-HELIX DRILL

A two-flute twist drill with a helix angle of 3540 ; used for drilling deep holes in metals, such as aluminum, copper, hard brass, and soft steel. Also known as fastspiral drill.

CRITICAL WEIGHT

In a drilling operation,the weight placed on a bit that will cause the drill string to become resonant with the angular speed at which the rotating shaft is operating.

DRILLING PLATFORM

The structural base upon which the drill rig and associated equipment is mounted during the drilling operation.

DRILL CABLE

A cable used to pull up drill rods, casing, and other drilling equipment used in making a borehole.

HORIZONTAL DRILLING MACHINE

A drilling machine in which the drill bits extend in a horizontal direction.

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