A general term for the derrick, power supply, draw works, and other
surface equipment necessary in rotary or cable-tool drilling.
See also:rig
a. See:drill diamond
b. Incorrectly used as a syn. for cuttings. Long
c. Sometimes designates drill diamonds ranging from 4 to 23 stones per
carat in size. Long
See:bit thrust
a. In rotary drilling, the time required for the bit to penetrate a
specified thickness (usually 1 ft or 0.3 m) of rock. The rate is dependent
on many factors. AGI
b. The elapsed time, excluding periods when not actually drilling,
required to drill a well. AGI
Preliminary digging out the clay in the taphole of a furnace. This is done
usually by hand, air, or electric drill. Fay
Also called drilled weight. See:bit load
The record of the events and the type and characteristics of the
formations penetrated in drilling a corehole. Syn:boring log
CF:log
See:driller
An appliance to provide a feed pressure and a support for the drilling
machine usually in tunnels. Four main types of drill mountings are in use,
namely, the post, the air leg, the drill frame, and the drill carriage.
Nelson
The volume of rock (in tons) corresponding to the footage drilled per
hour. Streefkerk
The placement of a number of boreholes in accordance to a predetermined
geometric arrangement. Long
Also called drilling pressure. See:bit load
a. The number of feet of borehole drilled in a specified interval of time;
e.g., drilling rate was 80 ft/d (24.4 m/d). Long
b. Price, expressed in dollars, per foot of borehole completed in
accordance with terms specified in a drill contract. Syn:feed rate
Long
A drill machine complete with all tools and accessory equipment needed to
drill boreholes.
A noncoring bit designed to be coupled to a reaming shell threaded to
couple directly on a drill rod instead of a core barrel. Long
a. The tunnel miner who normally handles the rock drills for blasting
purposes. Nelson
b. See:driller
a. A method of sampling a deposit by means of a drill or borehole. The
boreholes may be spaced at the corners of squares or triangles at
distances according to the nature and extent of the deposit.
See also:exploratory drilling
b. The sampling of gravel deposits or extensive low-grade ore deposits by
use of drills. Hoover
Machines for sharpening detachable bits and for making shanks.
Lewis
See:cuttings
May be used by drillers as a syn. for drill bit revolutions per minute;
drill rate; feed rate; feed ratio; feed speed; rate of penetration.
Long
The act of mining tabular ores 2 to 5 m thick using a drill-split tool.
Lombardi