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. 

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