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 Rotary Bit

Description of drill bit
 
(1) Cutting Structure of JESSIN tricone rock bit :
The durability of premium tungsten carbide inserts is improved with new formulas and new techniques for insert bit.The wear-resistance of teeth is enhanced with premium tungsten carbide hardfacing on the tooth surfaces for steel tooth bit.
 
(2) Gauge Structure of JESSIN tricone rock bit :
Multiple gauge protection with gauge trimmers on heel and gauge inserts on the gauge surface of the cone, tungsten carbide inserts and hardfacing on the shirttail increases gauge holding capability and bearing life.
 
(3)Bearing Structure of JESSIN tricone rock bit :
High precision bearing with two thrust faces. Balls lock the cone.Hardface heard 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.
 
(4)Seal and Lubrication of JESSIN tricone rock bit :
The advanced metal seal package consists of two metal seats and two elastic energizers. Compressed energizers ensure good contact being kept on two sealing surfaces of metal rings by elastic force, and achieve the bearing seal. In the drilling, metal seal are relatively dynamic, and the energizers are static. This will improve the reliability and durability of bearing seal. The pressure compensator system and advanced grease can greatly increase the lubricating reliability.
 
Main product
 
(1) IADC code: 116 117 126 127 136 137 216 217 226 226 316 317 326 327 336 337 115 125 135 215 225 235 315 325 335 114 124 214 314 111 121 131 346 347 417 427 437 517 527 537 617 627 637 737 837 832 415 425 435 445 525 625 635 416 427 436 446 447 516 526  537 547 516 536  535
 
(2) Sizes:  From 2 7/8 to 26"larger sizes for hole opener bit ,reamer bit
 
(3)bearing type: sealed bearing and non-sealed bearing ;HJ(metal sealed journal bearing)   ;HA (rubber sealed journal bearing ;aircooled bearing type
 
(4)formation or layer: soft ,medium soft ,hard,medium hard,very hard formation
 IADC Code Classifications

STEEL MILLING TOOTH BITS

IADC 1 SERIES DRILL BITS
These bits are used to drill low-compressive strength, soft formations. Long projection tooth lengths are used on high offset cones to provide the greatest penetration rates possible. Wear-resistant hardfacing is used to control tooth wear. On the softest bit types this hardfacing completely covers the bit teeth.

IADC 2 SERIES DRILL BITS
These bits are used to drill high-compressive strength, medium hard formations. Short projection teeth with reduced crest length are used in this series of bit designs. Durable hardfacing is applied to reduce tooth wear.

IADC 3 SERIES DRILL BITS
These bits are used to drill hard and abrasive formations. Very short, closely spaced teeth with minimum amounts of hardfacing are used for breakage resistance. These bits must withstand high loads and drill abrasive formations with a crushing, cutting action.

TCI (TUNGSTEN CARBIDE INSERT) BITS

IADC 4 SERIES DRILL BITS
These bits are used to drill low compressive strength, very soft formations. The bits maximize the use of both conical and chisel inserts of large diameters and high projection. This cutting structure design, combined with maximum cone offset, results in high bit penetration rates. The deep intermesh of cutter rows prevents bit balling in sticky formations.

IADC 5 SERIES DRILL BITS
These bits are used to drill low compressive strength, soft to medium soft formations. Drill bit design features are used to enhance bit penetration rates. Some reduction in cone offset and insert projection is used to improve cutter durability. Insert numbers and pitch is controlled to prevent tracking.

IADC 6 SERIES DRILL BITS
These bits are used to drill high-compressive strength, medium hard formations. A small amount of cone offset and low insert projection is used to prevent cutting structure damage when hard streaks are encountered. Increased numbers of blunter, smaller diameter inserts are used to increase life in harder, more abrasive formations.

IADC 7 SERIES DRILL BITS
These bits are used to drill hard and abrasive formations. A more wear-resistant grade of tungsten carbide insert is used to prevent wear. Low cone offset with increased numbers of breakage resistant cutters add to the required bit durability.

IADC 8 SERIES DRILL BITS
These bits can be used to drill extremely hard and abrasive formations. Wear-resistant inserts are used in the outer rows to prevent loss of bit gauge. Maximum numbers of hemispherical-shaped inserts are used in all rows to provide cutter durability and long life.
 
 
IADC CODE SELECTION
 
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
 
PIN SIZE
 
Bit Diameter
Thread: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"

 

 

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