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Tricone Drill Bit
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| Place of Origin | CHINA |
| Brand Name | ROSCHEN |
| Certification | API |
| Model Number | 8 1/2 |
8 1/2" Tricone Rock Drill Bit/TCI Tricone Bit/Oil Well Drill Bit
Rock breaking mechanism of tri-cone bit
1. Impact crushing
When the cone bit is working at the bottom of the well, the impact of the teeth on the rock by the longitudinal vibration of the bit is the main way to break the rock by the roller bit. When the drill bit is rotated, the teeth are pressed into the rock at a certain speed. This crushing method is similar to the static pressure in the crushing test. The pressing of the teeth into the rock requires sufficient specific pressure and contact time. Therefore, the axial load of the tooth of the roller bit on the rock includes the static pressure and the impact load. The drilling pressure applied to the drill bit is a static pressure portion; the impact load is generated by the drill bit when the bottom of the well rotates, so that the drill bit-drill string system is continuously compressed and stretched, and the lower drill string transmits the elastic deformation energy of the cycle to Produced by the cone, this is the source of the impact pressure of the teeth when the drill bit breaks the rock. Increasing the impact pressure of the drill bit on the formation can increase the efficiency of the broken rock.
2. Sliding shear
In the rock with higher plasticity, in addition to the impact of the teeth on the bottom rock, it also requires the teeth to have a certain sliding effect on the ground, so that the teeth cut the rock to expand the rock crushing effect. It is important when drilling in soft formations. Measures to cause slippage when the cone is rolled at the bottom of the well are super-top, compound cone and shift axis.
(1) Super top. The super top means that the cone top of the cone exceeds the centerline of the drill bit. The distance from the top of the cone to the centerline is called the super-topping. The larger the super-top distance, the larger the amount of sliding. The super-top produces a sliding in the tangential direction, and the rock between the teeth and the teeth on each ring of the cone is cut.
(2) Complex cone. The compound cone causes the cone to slip in the tangential direction, and as with the super-top, the rock between the teeth and the teeth on each ring of the cone is cut.
(3) Shifting axis. Shifting the shaft means that the axis of the cone is translated a distance relative to the axis of the bit. This distance is called the shifting wheelbase. If the shifting wheelbase is larger, the amount of sliding of the cone is larger, and the shearing effect is larger. The shifting shaft causes the teeth to slide axially, and the rock between the ring gears on the cone is cut.
3. The shearing action of the tooth itself
When the tooth is eaten into the rock under the action of axial pressure (drilling pressure), the wedge surface of the tooth produces a horizontal shear force on the rock in contact with it, and the rock undergoes shear fracture along the shear plane, along with the teeth. Move to remove the broken rock, which is the shearing effect of the tooth itself on the rock.
| Tricone Rolle Bits Product specifications: | |
| Model | Milled tooth bits tricone for water well,TCI bits tricone for water well |
| IADC Code |
116 117 126 127 136 137 216 217 226 316 317 326 327 336 337 115 125 135 215 225 235 315 325 335 114 124 214 314 111 121 131 346 347 |
|
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 |
|
| Bearing Type | H--Friction bearing; G--Roller bearing; F--Floating Bearing |
| Sealing Type | HJ(metal sealed journal bearing) |
| HA (rubber sealed journal bearing) air cooled bearing type | |
| Size | From 2 7/8" to 26" larger sizes for hole opener bit ,reamer bit |
| Material | alloy steel, tungsten carbide insert |
| Extra Feature | 1) Y-Conical teeth 2) X-chisel teeth 3) K- wide teeth 4) G- Gague protection |
| Applicable Formation | Very soft, soft, medium soft, hard, medium hard, very hard formation |
| Application |
Petroleum & gas, water well, mining and tectonic industries, oil field, construction, geothermal, directional boring, and underground foundation work. |
| NO. | TRICONE ROCK BIT SIZE | API THREAD REG.PIN | |
| in | mm | ||
| 1 | 3 3/4 | 95.3 | 2 3/8 |
| 2 | 3 7/8 | 98.4 | 2 3/8 |
| 3 | 4 1/8 | 104.8 | 2 3/8 |
| 4 | 4 1/4 | 108 | 2 3/8 |
| 5 | 4 1/2 | 114.3 | 2 3/8 |
| 6 | 4 5/8 | 117.5 | 2 7/8 |
| 7 | 4 3/4 | 120.7 | 2 7/8 |
| 8 | 4 7/8 | 123.8 | 2 7/8 |
| 9 | 5 1/2 | 139.7 | 3 1/2 |
| 10 | 5 5/8 | 142.9 | 3 1/2 |
| 11 | 5 2/3 | 143.9 | 3 1/2 |
| 12 | 4 3/4 | 146.1 | 3 1/2 |
| 13 | 5 7/8 | 149.2 | 3 1/2 |
| 14 | 6 | 152.4 | 3 1/2 |
| 15 | 6 1/8 | 155.6 | 3 1/2 |
| 16 | 6 1/4 | 158.8 | 3 1/2 |
| 17 | 6 1/2 | 165.1 | 3 1/2 |
| 18 | 6 5/8 | 168.3 | 3 1/2 |
| 19 | 6 3/4 | 171.5 | 3 1/2 |
| 20 | 7 1/2 | 190.5 | 4 1/2 |
| 21 | 7 5/8 | 193.7 | 4 1/2 |
| 22 | 7 7/8 | 200 | 4 1/2 |
| 23 | 8 3/8 | 212.7 | 4 1/2 |
| 24 | 8 1/2 | 215.9 | 4 1/2 |
| 25 | 8 5/8 | 219.1 | 4 1/2 |
| 26 | 8 3/4 | 222.3 | 4 1/2 |
| 27 | 9 1/2 | 241.3 | 6 5/8 |
| 28 | 9 5/8 | 244.5 | 6 5/8 |
| 29 | 9 7/8 | 250.8 | 6 5/8 |
| 30 | 10 1/2 | 266.7 | 6 5/8 |
| 31 | 10 5/8 | 269.9 | 6 5/8 |
| 32 | 11 | 279.4 | 6 5/8 |
| 33 | 11 5/8 | 295.3 | 6 5/8 |
| 34 | 12 | 304.8 | 6 5/8 |
| 35 | 12 1/4 | 311.2 | 6 5/8 |
| 36 | 12 5/16 | 312.7 | 6 5/8 |
| 37 | 13 3/8 | 314.3 | 6 5/8 |
| 38 | 12 7/16 | 315.9 | 6 5/8 |
| 39 | 12 5/8 | 320.7 | 6 5/8 |
| 40 | 13 1/8 | 333.4 | 6 5/8 |
| 41 | 13 1/2 | 342.9 | 6 5/8 |
| 42 | 13 5/8 | 346.1 | 6 5/8 |
| 43 | 13 3/4 | 349.3 | 6 5/8 |
| 44 | 14 1/2 | 368.3 | 7 5/8 |
| 45 | 14 3/4 | 374.7 | 7 5/8 |
| 46 | 15 1/2 | 393.7 | 7 5/8 |
| 47 | 16 | 406.4 | 7 5/8 |
| 48 | 17 1/2 | 444.5 | 7 5/8 |
| 49 | 18 7/8 | 479.4 | 7 5/8 |
| 50 | 20 | 508 | 7 5/8 |
| 51 | 22 | 558.8 | 7 5/8 |
| 52 | 24 | 609.6 | 7 5/8 |
| 53 | 26 | 660.4 | 7 5/8 |
| 54 | 28 | 711.2 | 7 5/8 |
| 55 | 30 | 762 | 7 5/8 |
Any questions please contact us:
ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschen.com ; http://www.roschen.net
http://www.roschen.cn ; http://www.roschendrill.com
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