Effect of clearance on rotary rock bit journal bearing contact stress
This paper presents a numerical method for analyzing the effect of clearance on closely conforming rotary rock bit journal bearings. The modified Boussinesq point-force displacement influence function and the modified profile function are introduced in conjunction with the discretization of the integral equation. Automatic mesh generation is employed to redefine a new pressure area boundary and therefore round-off errors normally found while solving a large-scale linear system of equations can be avoided. The numerical method has been implemented in a computer program and has been applied to the problems of misaligned and perfectly aligned conformal contact. There is a close agreement with the Persson's analytical solution at the center of the aligned bearing length. However, owing to a high stress concentration at the bearing edge, the edge pressure distribution will differ significantly from the Persson's plane stress model. The conformal contact will have a comparatively higher peak pressure and lower contact-angle than the Hertzian line contact prediction. The results of the analysis provides a design tool for improving drill bit life.
- Research Organization:
- Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712
- OSTI ID:
- 5623526
- Journal Information:
- J. Energy Resour. Technol.; (United States), Journal Name: J. Energy Resour. Technol.; (United States) Vol. 108:1; ISSN JERTD
- Country of Publication:
- United States
- Language:
- English
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020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BEARINGS
COMPUTER CALCULATIONS
DRILL BITS
DRILLING
DRILLING EQUIPMENT
EQUATIONS
EQUIPMENT
ERRORS
FUNCTIONS
INCIDENCE ANGLE
INTEGRAL EQUATIONS
NATURAL GAS WELLS
NUMERICAL SOLUTION
OIL WELLS
PRESSURE DEPENDENCE
PROGRAMMING
ROTARY DRILLING
SERVICE LIFE
STRESS INTENSITY FACTORS
WELL DRILLING
WELLS