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HENGJI BIT SPEC | IADC CODE 437 | | |
Diameter | 17 1/2"(444.5mm) | ||
Tooth Type | TCI | ||
Bearing Type | Elastomer sealed bearing | ||
Circulation Type | Mud fluid | ||
Thread Connection | 7 5/8 API REG PIN | ||
Nozzle | three jet nozzles | ||
Gauge Protection | Available | ||
Shirttail Protection | Available | ||
Operating Parameters | |||
RPM(r/min) | 150~70 | ||
WOB(KN) | 0.35~0.9 | ||
Formations | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft limestone, etc. | ||
Application | water well drilling,oil &gas well drilling ,HDD,exploration,geothermal well drilling,drilling projects,etc | ||
Cutting Structure
Reinforcing the comprehensive mechanical properties of cutting tooth by using high quality tungsten carbide inserts of new formula and new techniques of insert bit.
Gauge Structure
The multiple heel position with gauge trimmer on the heel, tungsten carbide and hardfacing on the shirttail, strengthened spear point will enhance the gauge protection
Bearing Structure
High precision journal bearing with two thrust faces. Ball locked cone. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved, and suitable for high rotary speed.
Tungsten carbide inserts highlights
Standard designing of cutting structure is convenient for clients to select drill bits of suitable models according to formations.
Scoop shaped compacts are sued for soft formations,conical-chisel shaped compacts are used for medium hard formation,and conical ball are used for abrasive formation. When drillability of formation is not good,samll cutting teeth and more teeth with good abrasion resistance quality should be used. When driil drillability of formation is good,large cutting teeth and less teeth are adopted to improve drilling speed.
HENGJI BIT SPEC | IADC CODE 437 | | |
Diameter | 17 1/2"(444.5mm) | ||
Tooth Type | TCI | ||
Bearing Type | Elastomer sealed bearing | ||
Circulation Type | Mud fluid | ||
Thread Connection | 7 5/8 API REG PIN | ||
Nozzle | three jet nozzles | ||
Gauge Protection | Available | ||
Shirttail Protection | Available | ||
Operating Parameters | |||
RPM(r/min) | 150~70 | ||
WOB(KN) | 0.35~0.9 | ||
Formations | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft limestone, etc. | ||
Application | water well drilling,oil &gas well drilling ,HDD,exploration,geothermal well drilling,drilling projects,etc | ||
Cutting Structure
Reinforcing the comprehensive mechanical properties of cutting tooth by using high quality tungsten carbide inserts of new formula and new techniques of insert bit.
Gauge Structure
The multiple heel position with gauge trimmer on the heel, tungsten carbide and hardfacing on the shirttail, strengthened spear point will enhance the gauge protection
Bearing Structure
High precision journal bearing with two thrust faces. Ball locked cone. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved, and suitable for high rotary speed.
Tungsten carbide inserts highlights
Standard designing of cutting structure is convenient for clients to select drill bits of suitable models according to formations.
Scoop shaped compacts are sued for soft formations,conical-chisel shaped compacts are used for medium hard formation,and conical ball are used for abrasive formation. When drillability of formation is not good,samll cutting teeth and more teeth with good abrasion resistance quality should be used. When driil drillability of formation is good,large cutting teeth and less teeth are adopted to improve drilling speed.
