0
DESIGN INNOVATION

Load-Responsive Hydrodynamic Bearing for Downhole Drilling Tools

[+] Author and Article Information
M. S. Kalsi, P. D. Alvarez, Aaron Richie

 Kalsi Engineering, Inc., 745 Park Two Drive, Sugar Land, TX 77478

D. Somogyi1

 Kalsi Engineering, Inc., 745 Park Two Drive, Sugar Land, TX 77478

1

Currently with Somogyi Engineering Associates.

J. Tribol 129(1), 209-217 (Nov 06, 2006) (9 pages) doi:10.1115/1.2404963 History: Received September 02, 2004; Revised November 06, 2006

A load-responsive hydrodynamic thrust bearing has been developed that has capabilities to operate under higher load and speed combinations than the current bearing designs used in roller cone drill bits, downhole drilling motors, and other downhole drilling tools. The bearing dynamic surface, which is initially flat, deflects elastically under load to provide an efficient hydrodynamic geometry that generates a lubricant film, with a minimum film thickness that varies from 0.25 to 2.0μm. The bearing operates with friction coefficients typically in the range of 0.003 to 0.005, which are significantly lower than the conventional roller cone bit thrust bearing designs that operate in a boundary/mixed lubrication regime. Lower friction will allow bit seals to run cooler, and higher load/speed capabilities will increase drilling efficiency and extend component life in hard rock formations. Additionally, the new bearing is suitable for applications where tilting pad thrust bearings are used, offering the advantage of being simple, compact, and more economical.

FIGURES IN THIS ARTICLE
<>
Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Typical roller cone bit showing space constraints on thrust bearings

Grahic Jump Location
Figure 2

Load-responsive thrust bearing concept

Grahic Jump Location
Figure 3

Finite element elastic deformation showing wedge formation under static load

Grahic Jump Location
Figure 4

Simplified free body diagram showing radial and thrust force components in a roller cone bit

Grahic Jump Location
Figure 5

Predicted hydrodynamic performance and load elastic response curves for the prototype bearing using semi-analytic solution

Grahic Jump Location
Figure 6

Predicted friction characteristic of the prototype bearing using semi-analytic solution

Grahic Jump Location
Figure 7

Predicted prototype bearing performance as a function of load using semi-analytic solution

Grahic Jump Location
Figure 8

Predicted film thickness and film pressure solution using coupled EHD analysis

Grahic Jump Location
Figure 9

Comparison of semi-analytical model and coupled elastohydrodynamic model predictions of pressure distributions at mean diameter

Grahic Jump Location
Figure 10

Conventional and load-responsive prototype bearing test specimens

Grahic Jump Location
Figure 11

Thrust bearing test fixture cross section

Grahic Jump Location
Figure 12

Test results for a conventional bearing

Grahic Jump Location
Figure 13

Test results for a load-responsive prototype bearing

Grahic Jump Location
Figure 14

A typical endurance test result for a prototype load-responsive hydrodynamic bearing

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In