A plastic or paper barrier used to prevent the escape of explosive
materials from a case. Atlas
To line a borehole with some form of steel tubing to prevent entry of
broken rock materials, gas, or liquids into the borehole. Also called
blank off; case. See also:blankoff
Som. Soft shale or bind in coal mines.
a. Special steel tubing welded or screwed together and lowered into a
borehole to prevent entry of loose rock, gas, or liquid into the borehole,
to prevent loss of circulation liquid into porous, cavernous, or crevassed
ground, and to support the sides of a borehole. See also:tubing;
flush-joint casing. Long
b. The large-diameter pipe cemented in the hole, such as surface casing,
protective casing, and production casing. Wheeler, R.R.
c. Process of inserting casing in a borehole. Long
d. A structure of wood, metal, or other material that completely encloses
the elevating or conveying machinery elements to support them; to afford
safety protection; to protect from the weather; to confine dust, gases, or
fumes arising from the material being conveyed; or to form a part of the
conveyor in the same manner as a trough.
e. A zone of material altered by vein action and lying between the
unaltered country rock and the vein.
f. A term applied to thin slabs of sandstone that split out between
closely spaced joints.
g. The steel lining of a circular shaft. See also:conduit
A safety device equipped with slips or dogs to catch and grip casing if it
is dropped while being lowered into or lifted from a borehole. Also
miscalled tubing catcher; tubing hanger. Long
A mechanical device designed to facilitate the hoisting or suspension of
casing in a borehole. Made by forming a half circle in a heavy steel bar.
When bolted together, in pairs, the bars fit around the outside and
tightly grip the casing. The size of the clamp is determined by the
outside diameter of the casing to be handled. See also:pipe clamp
Long
a. A lifting device consisting of one or more serrated sliding wedges
working inside a cone-shaped collar. Used to grip and hold casing while it
is being raised or lowered into a borehole. See also:bulldog; dog.
Long
b. A fishing tool. Long
A rubber-ball-type check valve, generally placed near the bottom of a long
string of casing. Its use reduces the load imposed on the hoisting
mechanism in lowering casing into a wet borehole. Also called casing
valve; float valve. Long
Process of inserting a line of casing into a borehole. See also:case;
case off. Long
In borehole drilling, the depth to which the casing is entered.
Pryor, 3
The pressure built up in the casing when closed at the top of the well. It
is usually measured by placing a pressure gage on one of the side outlets
on the casing head. Porter
A brown earthy substance found in peat and lignite beds and used as a
pigment; originally found near Cassel, Germany. Cologne brown or Cologne
earth is a similar substance originally found near Cologne, Germany.
Hess
A tetragonal mineral, 4[SnO2 ] ; rutile group; adamantine; reddish
brown to black; forms prismatic crystals, or massive concentric fibrous
structure (wood tin); sp gr, 7.03; occurs in veins associated with granite
and granite pegmatite, or placers (stream tin); a source of tin.
Syn:tin stone; tin spar; tin ore; black tin.
a. Secondary rock or mineral material that fills a cavity formed by the
decay or dissolution of some or all of the original hard material.
CF:mold
b. A sedimentary structure representing the infilling of an original mark
or depression made on top of a soft bed and preserved as a solid form on
the underside of the overlying and more durable stratum; e.g., a flute
cast or a load cast. Syn:counterpart
A refractory mix containing heat-resistant, hydraulic setting cement. A
refractory concrete. AISI
a. A refractory aggregate that will develop structural strength by
hydraulic set after having been tempered with water and compacted.
ARI
b. A mixture of a heat-resistant aggregate and a heat-resistant hydraulic
cement; for use, it is mixed with water and rammed or poured into place.
Harbison-Walker
Corn. The throwing up of ore from one platform to another successively.
See also:shamble
A former name for hohmannite, Fe+32 (SO4 )2
(OH)2 .7H2 O .
A drill bit in which the diamond-set crown is formed on a bit blank by
pouring molten metal into a prepared mold. Also called cast-set bit;
cast-metal bit. Long
A cast, extruded or pressed, solid high explosive used to detonate less
sensitive explosive materials. Atlas
A building in which pigs or ingots are cast. Fay