Tricone bit 9 7/8 inch Tricone roller rock drill bits used SECOROC
COP44 DTH Hammer for Codelco Mining Drilling
Tricone bit Included Steel Tooth (also referred to as milled tooth)
bits and Tungsten Carbide Insert (TCI) bits, TCI bits are much more
durable than Steel Tooth ones, but carry a higher cost to
manufacture. Both these two groups of Tricone Bits are available
with
(1) Open Bearing or Sealed Bearing
(2) Roller Bearing or Friction Bearing (Journal Bearing)
(3) Gage Protected or Non-Gage Protected, etc
What are tricone drill bits used for?
1. Tricone drill bits for soft rock formations
Soft rock formations consisting mainly of sand, clay, limestone or
shale, are ideal for drilling with mill tooth bits. In the soft
rock treatment, depending on the scope of the project and the
different duration, you can choose to seal or open the bearing of
milling tooth bits. Sealed bearing tricone drill bits last longer,
but often cost more because of the precise work required to protect
the bearings. Open bearing heads, on the other hand, are not well
protected and worn, but are cheap to manufacture. Tricone drill
bits designed for soft rock usually have longer protruding teeth,
"A" teeth or chisel knobs. In either case, the hole spacing is
large, so a soft tricone drill bit can be considered in the design.
2. Tricone drill bits for medium rock formations
If you want to drill calcite, dolomite, hard limestone and some
hard shale, you need to design tricone drill bit for medium rock.
You may need to better understand why tungsten carbide is the ideal
material for the tricone drill bit. It is useful to understand its
properties. Tungsten carbide, first discovered in 1927, is a very
strong and hard material that enables it to withstand higher
speeds, thereby achieving faster drilling speeds. in addition, the
tricone drill bit can absorb a lot of heat without damaging the
bit. The pitch of the intermediate drill is much smaller than that
of the soft drill. In addition, although teeth may have a similar
range of shapes, their teeth are less prominent.
3. Tricone drill bits for hard rock formations
Hard rock is tough, and abrasive rock usually includes hard shale,
calcite, mudstone, pyrite, granite and quartzite. The difficulty of
drilling in this material makes tricone drill bits almost
essential. The button has excellent hardness and strength, making
it able to withstand very difficult drilling conditions. As with
all tricone drill bits, you can choose between sealed and open
bearings. Sealed bearing drills provide better anti-wear
protection, making them more suitable for use before replacement.
Drills designed for hard formations often have fewer protruding
teeth. Teeth are short and tight. This greatly reduces the drilling
speed compared to soft rock, but if you are drilling hard rock, you
have little choice.
| Tricone Roller Drill Bits Specifications |
| Bit Diameter | API PIN |
| (inch) | (mm) |
| 3 7/8''~5 1/4'' | 98~134 | 2 3/8''. 2 7/8'' |
| 5 5/8''~6 3/4'' | 143~171 | 3 1/2'' |
| 7 1/2''~9 1/2'' | 190.5~241 | 4 1/2'' |
| 9 5/8''~13 3/4'' | 245~350 | 6 5/8'' |
| 14 5/8''~26'' | 371~660.4 | 7 5/8'' |
| IADC CODE SELECTION LIST |
| IADC | WOB | RPM | Application |
| (KN/mm) | (r/min) |
| 111/114/115 | 0.3-0.75 | 200-80 | very soft formations with low compressive strength and high drill
ability, like clay, mudstone, chalk |
| 116/117 | 0.35-0.8 | 150-80 | very soft formations with low compressive strength and high drill
ability, like clay, mudstone, chalk |
| 121 | 0.3-0.85 | 200-80 | soft formations with low compressive strength and high drill
ability, like mudstone, gypsum, salt, soft limestone |
| 124/125 | 180-60 |
| 131 | 0.3-0.95 | 180-80 | soft to medium formations with low compressive strength, like
medium, soft shake, medium soft limestone, medium soft sandstone,
medium formation with harder and abrasive interbeds |
| 136/137 | 0.35-1.0 | 120-60 |
| 211/241 | 0.3-0.95 | 180-80 | medium formations with high compressive strength, like medium, soft
shake, hard gypsum, medium soft limestone, medium soft sandstone,
soft formation with harder interbeds. |
| 216/217 | 0.4-1.0 | 100-60 |
| 246/247 | 0.4-1.0 | 80-50 | medium hard formation with high compressive strength, like hard
shale, limestone, sandstone, dolomite |
| 321 | 0.4-1.0 | 150-70 | medium abrasive formations, like abrasive shale, limestone,
sandstone, dolomite, hard gypsum, marble |
| 324 | 0.4-1.0 | 120-50 |
| 437/447/435 | 0.35-0.9 | 240-70 | very soft formations with low compressive strength and high drill
ability, like clay, mudstone, chalk, gypsum, salt, soft limestone |
| 517/527/515 | 0.35-1.0 | 220-60 | soft formations with low compressive strength and high drill
ability, like mudstone, gypsum, salt, soft limestone |
| 537/547/535 | 0.45-1.0 | 220-50 | soft to medium formations with low compressive strength, like
medium, soft shake, medium soft limestone, medium soft sandstone,
medium formation with harder and abrasive interbeds |
| 617/615 | 0.45-1.1 | 200-50 | medium hard formation with high compressive strength, like hard
shale, limestone, sandstone, dolomite |
| 637/635 | 0.5-1.1 | 180-40 | hard formation with high compressive strength, like limestone,
sandstone, dolomite, hard gypsum, marble |
| Note: Above limitts of WOB and RRPM should not be used
simultaneously |
For more information please contact:
ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschen.com ; http://www.roschen.net
