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Diamond bearings for Downhole Drilling ToolsDiamond bearings for Downhole Drilling ToolsDiamond bearings for Downhole Drilling Tools
Diamond bearings for Downhole Drilling ToolsDiamond bearings for Downhole Drilling ToolsDiamond bearings for Downhole Drilling Tools

Diamond bearings for Downhole Drilling Tools

PDC (polycrystalline diamond composite) bearings are usually divided into three categories: thrust bearings, radial bearings, and combined bearings.

Specification

What is Diamond bearings?
Diamond bearings are mainly composed of PDC cutters. PDC cutters (Polycrystalline Diamond Composite) consist of a polycrystalline diamond layer sintered with tungsten carbide substrate under ultra-high temperature and pressure.
Polycrystalline diamond is an extremely wear-resistant material that can be used to protect drilling tool components from abrasive wear caused by contact between the exterior of the tool and the borehole wall.
Polycrystalline diamond-bearing technology offers an innovative solution for pumping applications operating in harsh drilling fluid environments. 
 
Our PCD bearings for mud motors in downhole drilling tools and other bearing applications.
Examples include drilling turbines, mud motors, and other down-hole rotating tools. There are two main types: PDC radial bearing, and PDC thrust bearing.
 
PCD bearings Advantages:
 
High thermal conductivity: It can reduce the local extreme temperature that causes bearing degradation and avoid damage to bearing materials caused by high heat generated during bearing startup or shutdown.
 
High Load: Can operate effectively at a fairly high speed and load range. 
For example: In some oil and gas drilling, diamond bearings can operate 100-6000 rpm at loads up to 60,000 lbs.
 
Wear-resistant and high-temperature resistant: Diamond material has an extremely low friction coefficient (friction coefficient is between 0.01 and 0.03) and can operate at high temperatures (the current maximum temperature is 233°C)
 
High fracture toughness: Bearing materials with excellent fracture toughness reduces the likelihood of damage due to impact loads
 
High corrosion resistance: not affected by corrosive substances in the application environment, for example, not affected by natural or mud chemicals present in drilling
 
Simplification: Diamond bearings do not need to be specially lubricated during use. 
Since seals and independent lubrication systems are not required, equipment and components can be simplified.
 
Long life: Because the diamond surface is hard and wear-resistant, it can extend the life of the bearing. 
The service life is more than 6 times that of traditional tungsten carbide bearings or other carbide bearings (TC bearings).
 
Types of PCD bearings
PDC Bearing
 
Thrust PCD Bearings
 
Polycrystalline Diamond (PCD) thrust bearings are comprised of a series of PCD inserts assembled (usually by brazing) in carrier rings.
A typical PCD thrust bearing set includes a rotating and stationary bearing ring.
These two rings oppose each other with the planar PCD surface of one ring in direct contact with the PCD surface of the mating ring.
PCD thrust bearings are ideally suited for process-fluid-lubricated applications, particularly those where abrasive particles are present in the fluid.
 
Radial PCD Bearings
 
PCD radial bearings are ideally suited for process-fluid-lubricated applications, particularly those where abrasive particles are present in the fluid.
The PCD surfaces maintain their geometry and exhibit minimal wear in the presence of these abrasive-laden fluids.
 
Combination PCD Bearing
 
Some loading scenarios may require bearings that sustain both thrust and radial loads.
PCD inserts can be assembled in carrier rings and finished with a tapered profile.
The taper angle can be adjusted to accommodate higher thrust loads or higher radial loads as required by the application.

 

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