Multifaceted Slanted Drill Bit Cutter for Borehole Gage Control
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Solution Overview
Problem
Conventional rolling cone drill bits face challenges in maintaining a consistent borehole diameter and achieving high rates of penetration and durability, especially in hard and abrasive formations, leading to increased drilling time and costs.
Innovation Solution
The design incorporates cutter elements with a polygonal-shaped wear face and faceted side surfaces, featuring a radiused edge and varying corner sharpness, which are mounted on the rolling cone cutters to enhance durability and cutting efficiency by distributing stress and maintaining a full gage borehole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cutter elements are used in hard and abrasive formations, then the drill bit can penetrate the formation, but the cutter elements wear quickly and the borehole diameter becomes inconsistent
Solution Approach 1:
The cutter element incorporates different surface characteristics in different regions: a polished cutting surface for reduced friction and enhanced cutting in hard formations, and an unpolished or rough wear face for improved gage maintenance and borehole diameter consistency. This local differentiation allows the single cutter element to simultaneously address both penetration rate and borehole quality requirements.
2Reliability
If the drill bit is changed frequently to maintain performance, then the borehole quality is maintained, but the drilling time and cost increase significantly
Solution Approach 1:
The invention changes the surface finish parameter of the cutter element to create a dual-function design. The polished surface reduces friction and heat generation for sustained cutting performance in hard formations, while the unpolished wear face provides friction and abrasion resistance to maintain cutter element geometry and borehole gage. This parameter modification extends drill bit life and reduces tripping frequency.
3Duration of action of stationary object
If the cutter elements are made harder to increase durability, then they last longer, but they become more susceptible to breakage in hard formations
Solution Approach 1:
The cutter element features a rounded or radiused transition between the cutting surface and the body, eliminating sharp corners and stress concentration points. This curved geometry reduces the likelihood of catastrophic breakage under high impact loads in hard formations while maintaining the hardness required for durability. The rounded profile allows the cutter to roll and glide more smoothly, reducing shock loading.
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
This design improves the drill bit's ability to maintain a consistent borehole diameter, increase rates of penetration, and extend the drill bit's lifespan, reducing the frequency of bit replacements and associated costs in challenging formations.
Implementation Method 1
enhance durability and cutting efficiency by distributing stress
Implementation Method 2
the cutters thereby engaging and disintegrating the formation material in its path. The rotatable cutters may be described as generally conical in shape and are therefore sometimes referred to as rolling cones or rolling cone cutters. The borehole is formed as the gouging and scraping or crushing and chipping action of the rotary cones remove chips of formation material
Implementation Method 3
The cutters roll and slide upon the bottom of the borehole as the bit is rotated
Implementation Method 4
chips of formation material which are carried upward and out of the borehole by drilling fluid which is pumped downwardly through the drill pipe and out of the bit
Data Source
AI summary
A drill bit includes a cutter element having a tapered and faceted side surface extending to a peak, and a polygonal wear face that slopes from the peak toward the cutter element base. The cutter element is mounted in a cone cutter of a rolling cone drill bit and, in certain embodiments, is positioned such that, when the cutter element is in a position farthest from the bit axis, the wear face generally faces and is parallel to the borehole sidewall and the peak engages the borehole bottom.