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Description of the 8 3/8" Kingdream TCI Tricone Drill Bit
Size | 8 3/8"(212.7mm) |
Model | HA 447G |
IADC | 447 |
WOB(KN/mm) | 0.35-1.00 |
RPM(r/min) | 140-60 |
Bearing Type | Rubber Seal Sliding Bearing |
Type | Drill Bit |
API Regular Pin(inch) | 4 1/2 |
Cutting Structure | Cone shape compact in inner row, wedge compact in outer row. and added the amounts of row |
Applicable Formations | The soft formation with low competitive strength and high drillability such as shale, clay, soft limestone, rock salt, gypsum,etc |
Payment terms | L/C, T/T, Western Union |
MOQ | 1 Piece |
Delivery time | Within 7 days but still depending on the quantity of the order |
Packing | Wooden case or as your requirements |
Circulation system | Mud pump |
The structure features:
a. Increasing the impact resistance of compacts and decreasing the breakage rate
by using the tungsten carbide compact of high strength and toughness.For hard
formation drilling.
b. Improving the seizure resistance and capacity of the bearing by applying carbide
layer on head bearing surface and silver plating in the ID of cone.
c. Increasing the reliability of bearing seal by using high-saturated buna-N rubber
O ring seal with larger cross section, and a seal boss is added to the outer end
of the sealing area.
d. Being able to stand high RPM by using ball locked cone.
e. Taking good advantage of the cutting ability and cutting speed by optimizing the
design of compact numbers and rows, the exposure height and the special shaped
compacts.
f. Providing the bearing system with good lubrication, extending the bit life and ensuring the normal work of the O-ring seal by using all rubber compensator to limit
the pressure differential and prevent drilling fluid from entering into bearing
lubrication system.
g. Increasing the high temperature resistance of the seal & lube system by using new
type of grease, which can stand high temperature up to 250 centigrade and with low
abrasive wear. Applicable formations Hard formation.
API&ISO 8 3/8" Kingdream HA 447G TCI Tricone rock drill bit/three cone bit