Tri-cone Bit Composite Roller-Journal Bearing High RPM Drilling
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Solution Overview
Problem
Current tri-cone bits experience reduced bearing life and increased vibrations and wear at high RPM and WOB conditions, leading to decreased drilling efficiency and premature failure of cutting elements.
Innovation Solution
A tri-cone bit with a composite roller-journal bearing and metal face seal, combined with a sliding bushing and specialized cutting elements and hydraulic system, designed to withstand high RPM and WOB, featuring arc-shaped slides and oil grooves for improved lubrication and a spiral backflow channel for enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If journal bearing is used in tri-cone bit, then the bit can withstand high WOB, but the bearing life is greatly decreased at high RPM
Solution Approach 1:
The patent applies a composite roller-journal bearing that combines roller bearing elements and journal bearing elements into a single integrated structure. The roller bearing portion handles radial loads from high RPM rotation, while the journal bearing portion handles axial loads from WOB, allowing the bit to withstand high WOB while maintaining bearing life at high RPM conditions
Solution Approach 2:
The invention merges two different bearing types (roller bearing and journal bearing) into a unified composite bearing structure. The roller bearing section and journal bearing section work together to simultaneously address the conflicting requirements of high RPM durability and high WOB capacity, resolving the technical contradiction between bearing life and force capacity
2Speed
If roller bearing is used in tri-cone bit, then the bit can withstand high RPM, but the bearing cannot withstand high WOB
Solution Approach 1:
The composite roller-journal bearing integrates roller bearing elements for radial load handling at high RPM with journal bearing elements for axial load handling at high WOB, creating a unified structure that simultaneously provides both high speed and high force capacity
Solution Approach 2:
The composite bearing serves multiple functions within a single component: it provides both radial support for high RPM rotation and axial support for high WOB application, making the bearing system universally capable of handling both high speed and high force conditions that previously required separate bearing types
3Productivity
If high RPM drilling is accompanied by high WOB, then drilling efficiency is improved, but impact force on cutting elements increases causing severe vibrations and wear
Solution Approach 1:
The patent applies cushioning elements and vibration damping features in the bearing structure and cone assembly that absorb and reduce impact forces before they reach the cutting elements. This beforehand cushioning protects the cutting elements from severe vibrations and impact damage while allowing high WOB to be applied for improved drilling efficiency
Solution Approach 2:
The invention converts the harmful impact forces and vibrations generated by high WOB application into beneficial effects by using the bearing structure and cone design to dampen vibrations and distribute loads more evenly, transforming the potentially damaging high-impact conditions into controlled, efficient cutting action that extends cutting element life
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution extends bearing life, reduces impact on cutting elements, and significantly improves drilling efficiency and the working life of the bit, allowing for higher RPM and WOB conditions with increased lubrication and effective cutting performance.
Implementation Method 1
a bearing between the cones and the head sections is a composite roller-journal bearing which is formed by rollers and arc-shaped slides arranged in an alternating way
Implementation Method 2
a bearing between the cones and the head sections is a composite roller-journal bearing which is formed by rollers and arc-shaped slides arranged in an alternating way
Implementation Method 3
a seal means for the bearing is of metal face type
Implementation Method 4
allowing for higher RPM and WOB conditions with increased lubrication
Data Source
AI summary
This invention relates to a tri-cone bit for high RPM drilling applications, which comprises three head sections and three cones. Cutting elements are arranged on each cone. Upper parts of the three head sections are joined together to form a bit body, on which nozzle sockets are provided, and nozzles are installed in bores of the nozzle sockets. A bearing between the cones and the head sections is a composite roller-journal bearing which is formed by rollers and arc-shaped slides arranged in an alternating way, and a seal means for the bearing is of metal face type. The composite roller-journal bearing of the invention can withstand high RPM and high load, and also has a higher resistance to impact, thereby ensuring longer working life of the bearing under high RPM and medium-high WOB. The six-point gage protection structure enhances stability of the bit and reduces cutting element breakage caused by bit vibration. The above tri-cone bit is suitable for high RPM and medium-high WOB drilling applications and features high drilling efficiency and long service life.