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Underground Mining 15’ Heavy Weight Drill Pipe
Heavy Weight Drill Pipe Introduction
Heavy Weight Drill Pipe are a fixed length with a shank at one end
and a bit at the other ,and are able to drill to a depth equivalent
to their effective length.The bit may consist of single chisel
shaped tungsten carbide insert or three such inserts.
To drill deep holes,the rods are designed to be used in a series
where the length of any rod used in longer than the one used just
before it.
To do this ,a series of rods must be produced so that the bit
diameter is reduced for each increase in length if rod to prevent
jamming of the bit in the hole.
Rotary Subs:
Roschen rotary subs include:
Straight OD subs
Reduced section OD subs
Crossover subs
Bit Subs
Saver Subs
Side Entry Subs
Pump In Subs
The rotary subs are available in standard sizes specified in API
and in a full range of connection combinations. Special sizes and
configurations are available upon request.
Lift Subs/Lift Plugs:
Roschen offers lift subs and lift plugs from size 3-1/8" to 11"
manufactured to the same specifications used for drill
collars.
Manufacturing:
All accessories except welded pup joints are manufactured from
solid modified alloy steel bars similar to drill collars which are
fully heat treated to the required chemistry and mechanical
properties. The internal bore is trepanned with precision and
machined to size with comprehensive quality control.
Pictures