Page 54 - Diamond Products Catalog

DHM BITS
Directional Drilling Tools
Downhole motors (DHM) bits are threaded onto downhole motors and used in directional drilling applications. They have reinforced center ports and have an impregnated full face crown.
Boart LongyearTM directional drilling bits can also be used as an impregnated plug bit.
Impregnated Directional Drilling Bits
The combination of diamond and matrix determines the performance of an impregnated bit. The simultaneous erosion of the matrix and the diamonds makes the bit self-sharpening. Boart Longyear uses a special matrix which provides optimal performance.
Boart Longyear directional drilling bits feature threaded ports in shank allowing plugs to be threaded to more closely regulate fluid flow.
DHM BIT NAMING CONVENTION
Finding the right bit is easy. The naming convention directly corresponds to the description of the bit in the list of part numbers.
AW R/P 10 S TP
12345
1. Thread
Directional bits are available in a variety standard drilling thread types as well as a number a region-specific sizes.
2. Plug definition
3. Matrix Formula
Impregnated bits are available in a variety of different formulas to cover the widest possible range of ground conditions. See page 26 or 34 for additional details about specific formulas.
4. Gauge
Bits are available in three standard gauge configurations.
5. Options
Where applicable, shank options such as Threaded Shank Ports (TP) are identified here.
Standard Gauge (S)
Equal To Reaming Shell Gauge (R)
Oversized Outer Diameter (OS Inches)
Rod Box (R/B)
Rod Pin (R/P)
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