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API 8-1/2" PDC Drill Bit for Hard Rock Drilling
As for the mechanical strength of rock, the tensile strength is the lowest, followed by the shear strength, and the compressive strength is the highest which is often several to ten times higher than the shear strength. Obviously, it is much easier and more effective to break rock by shearing than by crushing. The PDC bit's compact cutting structure just utilizes the mechanical property of rock, and uses the efficient shearing way to break the rock, thereby achieving the purpose of fast drilling. When PDC bit in a formation with soft to intermediate hardness, the compact cutting teeth overcome the formation stress enter the formation and slide forward under the effect of WOB and torque, and the rock is broken along its shear direction under the action of cutting and plastic flow is produced. The cuttings produced by cutting are in large pieces, which are then brought by the mud jetting out from nozzle to the annulus between the drill bit and the borehole wall, are transported out of the well.
| Bit type | 8-1/2" SS1605DFX | |
| lADC Code | S423 | |
| Number of Blades | 5 | |
| Cutter Size(mm) | Φ15.88MM; Φ13.44MM | |
| Cutter Qty | Φ15.88x24; Φ13.44x49 | |
| Nozzle Qty | 7NZ TFA:1310.38mm² | |
Channe1 area of chip removal chute (mm²) |
12,216.0 mm² | |
| Gauge protector length (mm) | 75mm | |
| Connector | 4-1/2"API REG | |
| N.W/G.W.(KG) | 54/70KG | |
| Nozzle Size(inch) | 5/8x5; 9/16x2 |
1. Check whether the last bit used has any damage, cutter dropping, diameter reduction, etc., make sure there is no cutter and other hard articles of cemented carbide or steel at the bottom of the well after the last use of the bit, and clean the bottom of the well if necessary.
2. Check whether there is any abnormality in the cutters of the drill bit, whether there is O-ring in the nozzle hole, and install the nozzle as required.
3. Clean the bit male or female thread and apply thread oil.
4. Install the unloader on the drill bit and lower the drill string so that it comes to contact with the male or female thread and make up.
5. Put the drill bit and the unloader into the turntable bushing, and then tighten the screw thread according to the recommended torque value.
Weifang Shengde Petroleum Machinery Manufacturing Co., Ltd. is an excellent petroleum equipment enterprise in China, which is the first-class network supplier of PetroChina and Sinopec, and our main products are downhole motor, oil drilling bits, progressive cavity pump, etc. and all kinds of fittings, we have a professional research and development team, which has obtained 9 national invention patents and 16 utility model patents, and we have professional production equipments, including advanced CNC machine tools, including Yamazaki Mazak from Japan, and we have an independent physical and chemical laboratory, which can carry out any test on the rubber and mechanical properties.
2.China National Petroleum Corporation (CNPC) and Sinopec company (CNPC) oil drilling and production machinery manufacturing network supplier.
3.Independent physical and chemical laboratory, professional inspection engineers, can handle any mechanical performance tests and heat treatment experiments.
4.All kinds of Oil drilling bit models complete, dedicated to serve you.
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