Bit type | IADC Code | Applicable formation | Main characteristics of the bit | Recommended parameters | |
Cutting structure | Normal WOB KN/mm(bit dia.) | Rotary Speed(rpm) | |||
THAT447G | 447 | Soft with low compressive strength and high drillability.such as shale.clay sandstone,soft limestone salt bed and gypsolyte,etc. | Conical and conical scoop compacts in inner row,, with added number of compact rows, and a row of trimmers is added between gage row and heel row. | 0.35-1.00 | 140-60 |
THAT517G | 517 | Soft with low compressive strength and high drillability.such as shale.clay,sandstone and soft limestone,etc. | Large dia,offset crested scoop compacts in inner row,wgdge compacts in outer row ,and a row of trimmers is added between gage row and heel row | 0.35-1.05 | 120-50 |
THAT527G | 527 | Soft with low compressive strength ,such as shale,clay,sandstone,soft limestone.salt bed and hard gypsolyte,etc. | Conical and conical scoop compacts in inner row,wedge compacts in outer row,with added number of ompacts. and a row of trimmers is added between gage row and heel row | 0.35-1.05 | 120-50 |
THAT537G | 537 | Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,hard gypsolyte,soft limestone,sandstone and dolomite with stringers,etc. | Offset crested scoop compacts in inner row,wedge compacts in outer row , inequable spaced compacts arrangement.,and a row of trimmers is added between gage row and heel row | 0.50-1.05 | 110-40 |
THAT547G | 547 | ||||
THAT617G | 617 | Medium hard with high compressive strength and thick&hard stringers,such as hard shale, limestone.sandstone and dolomite,etc. | Large radius scoop compacts in inner row,wedge compacts in outer row and inequable sqaced compacts arrangement. and a row of trimmers is added between gage row and heel row | 0.50-1.05 | 80-40 |
THAT637G | 637 | Medium hard with high compressive strength and high abrasiveness,such as limestone,dolomite, sandstone and chert,etc. | Large radius scoop compacts in inner row,spherical compacts in outer row., and a row of trimmers is added between gage row and heel row | 0.70-1.20 | 70-40 |
THAT737G | 737 | Medium hard with high compressive strength and high abrasiveness,such as limestone,dolomite, sandstone and chert,etc.. | Large radius scoop compacts in inner row,spherical compacts in outer row., and a row of trimmers is added between gage row and heel row | 0.70-1.20 | 70-40 |
NO. | Tricone bit size | Thread sizes | NO. | Tricone bit size | Thread sizes | |||
Inch | mm | inch | mm | |||||
1 | 3-3/4 | 95.3 | 2-3/8 | 28 | 9-5/8 | 244.5 | 6-5/8 | |
2 | 3-7/8 | 98.4 | 2-3/8 | 29 | 9-7/8 | 250.8 | 6-5/8 | |
3 | 4-1/8 | 104.8 | 2-3/8 | 30 | 10-1/2 | 266.7 | 6-5/8 | |
4 | 4-1/4 | 108.0 | 2-3/8 | 31 | 10-5/8 | 269.9 | 6-5/8 | |
5 | 4-1/2 | 114.3 | 2-3/8 | 32 | 11 | 279.4 | 6-5/8 | |
6 | 4-5/8 | 117.5 | 2-7/8 | 33 | 11-5/8 | 295.3 | 6-5/8 | |
7 | 4-3/4 | 120.7 | 2-7/8 | 34 | 12 | 304.8 | 6-5/8 | |
8 | 4-7/8 | 123.8 | 2-7/8 | 35 | 12-1/4 | 311.2 | 6-5/8 | |
9 | 5-1/2 | 139.7 | 3-1/2 | 36 | 12-5/16 | 312.7 | 6-5/8 | |
10 | 5-5/8 | 142.9 | 3-1/2 | 37 | 12-3/8 | 314.3 | 6-5/8 | |
11 | 5-2/3 | 143.9 | 3-1/2 | 38 | 12-7/16 | 315.9 | 6-5/8 | |
12 | 5-3/4 | 146.1 | 3-1/2 | 39 | 12-5/8 | 320.7 | 6-5/8 | |
13 | 5-7/8 | 149.2 | 3-1/2 | 40 | 13-1/8 | 333.4 | 6-5/8 | |
14 | 6 | 152.4 | 3-1/2 | 41 | 13-1/2 | 342.9 | 6-5/8 | |
15 | 6-1/8 | 155.6 | 3-1/2 | 42 | 13-5/8 | 346.1 | 6-5/8 | |
16 | 6-1/4 | 158.8 | 3-1/2 | 43 | 13-3/4 | 349.3 | 6-5/8 | |
17 | 6-1/2 | 165.1 | 3-1/2 | 44 | 14-1/2 | 374.7 | 7-5/8 | |
18 | 6-5/8 | 168.3 | 3-1/2 | 45 | 14-3/4 | 374.7 | 7/5/8 | |
19 | 6-3/4 | 171.5 | 3-1/2 | 46 | 15-1/2 | 393.7 | 7-5/8 | |
20 | 7-1/2 | 190.5 | 4-1/2 | 47 | 16 | 406.4 | 7-5/8 | |
21 | 7-5/8 | 193.7 | 4-1/2 | 48 | 17-1/2 | 444.5 | 7-5/8 | |
22 | 7-7/8 | 200.0 | 4-1/2 | 49 | 18-7/8 | 479.4 | 7-5/8 | |
23 | 8-3/8 | 212.7 | 4-1/2 | 50 | 20 | 508.0 | 7-5/8 | |
24 | 8-1/2 | 215.9 | 4-1/2 | 51 | 22 | 558.8 | 7-5/8 | |
25 | 8-5/8 | 219.1 | 4-1/2 | 52 | 24 | 609.6 | 7-5/8 | |
26 | 8-3/4 | 222.3 | 4-1/2 | 53 | 26 | 660.4 | 7-5/8 | |
27 | 9-1/2 | 241.3 | 6-5/8 | |||||
