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Articles


Performance of Diamond Bearings for Boundary, Mixed-mode and Hydrodynamic Lubrication Regimes

Sep 17th, 2013

Abstract

Extreme operating and environmental conditions, such as high and varying load, high temperature, high or varying speed, and less than ideal lubricating fluids can cause excessive wear, damage, and even failure in conventional thrust bearings. This paper discusses the advantages of polycrystalline diamond (PCD) bearings operating in boundary, mixed-mode and hydrodynamic lubrication regimes. Experimental results demonstrate that PCD bearings survive and operate with low friction and little wear regardless of the lubrication regime. This is significant because bearings are commonly designed to function well in only one mode of lubrication. Conventional fluid film bearings, for example, are designed for operation in the hydrodynamic regime only, but PCD bearings can be designed to operate efficiently with hydrodynamic fluid film lubrication, transitory mixed-mode lubrication, or even boundary mode lubrication. The results discussed in this paper confirm the potential effectiveness of PCD bearings in applications with variable loads, speeds, frequent starts, stops and less than ideal lubricating fluids.

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Analysis of Diamond Segmented Pads on Rotating and Stationary Bearings in Contact Sliding

Sep 17th, 2013

Abstract

Polycrystalline diamond (PCD) bearings are designed for severe conditions where contaminated fluids, high and varying loads and speeds, and elevated temperatures cause failure in machine components. PCD bearings have demonstrated successful application in the oil and gas industry, marine environments, and many others due to their unique properties: hardest known material, high thermal conductivity, superior wear resistance, and low coefficient of friction (COF). This paper discusses the development and results of a thermal computational fluid dynamic (CFD) analysis for PCD bearings with comparison to laboratory test results. The analysis was performed on a single pad segment of the PCD bearing. With specified fluid properties, flow rate, speed, load, and COF, the analysis determines the heat transfer coefficient in terms of the dimensionless Nusselt (Nu) number. The Nu number was developed through the use of five dimensionless governing parameters: the Reynolds (Re) number, the Prandtl (Pr) number, a viscous heat dissipation term, a thermal conductivity term, and a total mass flow rate term. The results show consistency between the CFD analysis and the laboratory tests with a generalized heat transfer coefficient ranging from 500 to 3000 W/m2K, depending upon the input parameters. This analysis will further the design and development of segmented PCD bearings.

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Wear-in Behaviour of Polycrystalline Diamond Thrust Bearings

Jul 8th, 2013

Abstract

Polycrystalline diamond (PCD) bearings are designed for use in harsh environments, including process-fluid-lubricated applications such as those in oil and gas drilling turbines. This paper discusses the wear-in behaviour of polycrystalline diamond thrust bearings. Laboratory test results are presented that show the roughness, profile, and coefficient of friction of the polycrystalline diamond wear pads as the wear-in of the polycrystalline diamond bearings progresses. Laboratory test results show a significant decrease in the surface roughness and a change in the profile of the wear pads. Measured values of the coefficients of friction reveal that the lubrication regime of PCD thrust bearings can move from boundary to mixed-mode and may even become hydrodynamic after wearing-in for a period of time under the right conditions. This mechanism can provide extended life for PCD thrust bearings in harsh environments.

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Polycrystalline Diamond Thrust Bearings for Down-hole Oil and Gas Drilling Tools

Jul 8th, 2013

Abstract

Down-hole tools used for drilling oil and gas wells are subjected to harsh environments where abrasive fluids, high loads and speeds, and high temperatures can cause tool components, including thrust bearings, to quickly fail. This paper discusses the advantages that polycrystalline diamond can provide when used as a bearing material in down-hole tools. Laboratory test results are presented that can be used to help predict the performance of polycrystalline diamond bearings in these down-hole applications. Results from two types of tests are presented including tests that measure bearing capacity and those that evaluate diamond bearing wear rates. Bearing failures, generated during laboratory testing, are discussed. These failures are very similar to those observed in down-hole drilling tools and indicate that thermal damage to the polycrystalline diamond structure is the main cause of bearing failure. Bearing wear rates measured during laboratory testing show that polycrystalline diamond thrust bearings can provide a long-lasting bearing solution for down-hole drilling tools.

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UVBusinessQ Profile: US Synthetic

Feb 27th, 2013

Valuing human life is a strong foundation in business and in life. US Synthetic, a father-son global enterprise, is based on this culture where employees thrive on learning and experience and use it to bless others around the globe.

In 1978, Bill Pope, a former BYU chemical engineering professor, and his son Louis founded the Orem-based company. US Synthetic is known for manufacturing PCDs (polycrystalline diamond cutters) for oil and gas exploration. But really, the business stretches into much more.

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The Development of Open Water-lubricated PCD Thrust Bearings for Marine Hydrokinetic Energy Machines

Dec 13th, 2012

The Development of Open Water-lubricated Polycrystalline Diamond (PCD) Thrust Bearings for Use in Marine Hydrokinetic (MHK) Energy Machines

A polycrystalline diamond (PCD) bearing has been developed that will operate successfully in Marine Hydro-kinetic (MHK) machine applications. PCD bearings represent a new class of bearings that have, heretofore, not been extensively studied. This work makes significant contributions to understanding the performance of these bearings.

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Utah Genius Announces 2012 Winners

Apr 27th, 2012

SALT LAKE CITY, UT, Apr 25, 2012 (MARKETWIRE via COMTEX) -- Utah Genius (www.utahgenius.com), presented by Bateman IP Law Group, KSL and Zions Bank, today announced the winners, including US Synthetic and a number of its employees, of the 2012 Utah Genius Awards at the Little America Hotel in Salt Lake City. The awards serve as the state's prime program for recognizing and paying tribute to the creative people, one being US Synthetic Bearing's General Manger, Craig Cooley, and companies that contribute heavily to the state's growth by securing numerous patents and trademarks.

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Diamond powder bearings promoted to energy sector

Mar 8th, 2011

US Synthetic Bearings, a creator of synthetic diamond bearings for the energy industry, was selected to form part of the technology showcase at the US Department of Energy’s Advanced Research Projects Agency – Energy (ARPA-E) Energy Innovation Summit, joining companies such as Dow, Bosch, and Lockheed Martin.

The US Department of Energy has also given US Synthetic Bearings a grant to look at the advantages of diamond bearings in harsh underwater conditions for power generation.

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Diamond Bearing Technology for Deep and Geothermal Drilling

Oct 6th, 2010

Presentation given by US Synthetic Bearings' Director of Engineering, Tim N. Sexton, at the 2010 NMN Symposium in Celle, Germany.

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Laboratory drill rig for PCD bearing and cutter development

Oct 28th, 2009

Correlation of accelerated laboratory testing to actual field performance is essential in successful development of polycrystalline diamond cutters (PDCs) and diamond bearing elements for down-hole applications. A laboratory scale drill rig apparatus for the investigation of diamond bearing and drag bit cutter performance has recently been completed. The laboratory scale test rig is capable of producing rotary speeds from 40 to 1500 rpm, normal forces up to 165 kN, torque up to 1900 Nm, and rates of penetration up to 67 m/hr. Drilling tests to evaluate PCD cutters can be conducted using a controlled normal force or controlled rate of penetration. Test methods have been developed to enable accurate comparisons of PCD inserts to be made, typically in one day or less. PCD bit testing shows that we can clearly differentiate cutting efficiency and wear rates based upon changes in the material properties of the PCD inserts. The test rig can also be utilised to measure wear rates and frictional forces in diamond thrust bearings. Full scale PCD bearing experiments indicated that the bearings were capable of much higher loading than previously thought. Correlation between laboratory results and actual field performance will also be discussed. Article by J. Lund, C. Cooley, J. Gonzalez and T. Sexton.

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Like a Diamond

Aug 1st, 2009

September 2009 US Synthetic Bearings was featured in the Resource Engineering and Maintenance Magazine

US Synthetic Corporation (a provider of polycrystalline diamond cutters(PDCs) for oil and gas exploration) announced the availability of its radial bearing line that's based on synthetic diamond technology. Compared to tungsten-carbide technology, US Synthetic says its radial and thrust bearings extend bearing life by four to 10 times in the harshest real-world environments.

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US Synthetic Introduces Synthetic Diamond Bearings

Jun 9th, 2009

US Synthetic Bearings was featured on eBearing.com

US Synthetic Bearings (USA, a division of Dover; NYSE: DOV) has launched the industry's first commercially viable lineup of radial bearings, based on synthetic diamond technology. Craig Cooley, US Synthetic Bearings Division General Manager, said: "Our radial bearings offer truly disruptive advances with longer life, reduced size, and increased lateral load-carrying capacity. A single installation can save many thousands of dollars in rig time."

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Using Diamond Bearings in Your Next Design

Jun 3rd, 2009

US Synthetic Bearings was featured in The Design World Audio Podcast

Diamonds are not only "a girl's best friend." Soon they may be engineers' best friend too. US Synthetic Bearing takes advantage of its parent company's expertise with synthetic diamonds and applies that knowledge to radial thrust bearings to create a product that offers long life and low maintenance. Off-highway, oil and gas, and other industries benefit from these rugged bearings.

Design World's Leslie Langnau interviews Craig Cooley, General Manager of US Synthetic Bearings to find out more about Diamond Bearings, how they compare to more traditional bearings

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WEAR Science Journal Article - 2009

Jan 5th, 2009

Down-hole tools used for drilling oil and gas wells are subjected to harsh environments where abrasive fluids, high loads and speeds, and high temperatures can cause tool components, including thrust bearings, to quickly fail. This paper discusses the advantages that polycrystalline diamond can provide when used as a bearing material in down-hole tools. Laboratory test results are presented that can be used to help predict the performance of polycrystalline diamond bearings in these down-hole applications. Results from two types of tests are presented including tests that measure bearing capacity and those that evaluate diamond bearing wear rates. Bearing failures, generated during laboratory testing, are discussed. These failures are very similar to those observed in down-hole drilling tools and indicate that thermal damage to the polycrystalline diamond structure is the main cause of bearing failure. Bearing wear rates measured during laboratory testing show that polycrystalline diamond thrust bearings can provide a long-lasting bearing solution for down-hole drilling tools.

For the full-text version of this article, please contact us.

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