Cutting Structure
In response to the characteristics that inserts in different areas on the cone have different cutting actions, conical inserts are placed in permanent contact area and aedge inserts are placed in alternative contact area so that the drilling efficiency is greatly improved. Wear resistance of cutting structure is enhanced by setting diamond inserts in the permanent contact area of the cone where inserts are severely worn. Tungsten carbide inserts are placed on cone top face to protect cone body from abrasive erosion.
Gauge Structure
With active cutting protection inserts on bit body, the bit has good gauge protection and updrill capability.
Bearing Structure
High precision journal bearing. Balls lock the cone. Hardfaced head bearing surface. Cone bearing surface. Cone bearing inlaid wit friction-reducing alloy. Abrasion resistance and seizure resistance of the bearing are improved. Compared with three cone bit, the leg bearing is bigger, so it can receive higher WOB and high reliability.
Hydraulic Design
Small angled watercourse design increased the shirttail thickness and can effectively prevent the watercourse erosion. Optimized hydraulics structure improves the cleaning capability abd increase ROP.
Product Application
It is suitable for sidetracking, deep well drilling and old well repairing.
Current Availability
Bit SizeBite Type
In mm
4 1/8104.8KD527 KD 547 KD 617
4 1/2114.3KD527 KD 547 KD 617
4 5/8117.5KD527 KD 547 KD 617
4 7/8123.8KD527 KD 547 KD 617
5 1/2139.7KD527 KD 547 KD 617
6152.4KD527 KD 547 KD 617
6 1/2165.1KD527 KD 547 KD 617
7 1/2190.5KD527 KD 547 KD 617
7 7/8200.0KD527 KD 547 KD 617
8 1/2215.9KD527 KD 547 KD 617
Recommended Drilling Parameters
IADCWOB
KN/MMRPM
r/minApplication Formations
5270.3-0.7120-50Soft formation with low compressive strength and high drill ability, such as mudstone, gypsum, salt, soft shale, soft limestone. etc.
54703.-0.7100-50Soft to medium formations with low compressive strength and high drill ability, such as mudstone, gypsum, salt, soft shale, soft limestone. medium formation with harder and abrasiver interbeds,etc.
6170.4-0.890-50Medium hard formations with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc.
Note: the upper limits of WOB and RPM in above table should not be used stimultaneously.
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