Drill Bit Indenting Member Stabilizes Hard Formation Drilling
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Solution Overview
Problem
Drill bits often suffer damage due to bit whirl and excessive weight-on-bit when drilling through hard formations, leading to reduced penetration rates and costly replacements, as existing solutions do not effectively manage these issues in real-time.
Innovation Solution
A drill bit design featuring a hardened indenting member coaxial with the axis of rotation, which shares weight-on-bit load with the blades and cutting elements, limiting depth of cut in hard formations and stabilizing the bit by jacking it, thereby reducing damage and increasing penetration rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weight on bit is increased to improve penetration rate, then productivity increases, but drill bit damage occurs due to excessive loading
Solution Approach 1:
The indenting member is positioned ahead of the cutting elements to pre-load and stabilize the bit on the borehole bottom before the cutting elements engage the formation. This preliminary action prevents sudden bit settlement and allows controlled weight-on-bit application, enabling higher productivity without compromising bit durability.
Solution Approach 2:
The indenting member acts as an intermediary between the drill bit body and the formation rock. It distributes and regulates the weight-on-bit force, preventing direct excessive loading on the cutting elements and blades, thus maintaining bit reliability while allowing increased overall weight for improved penetration rate.
2Productivity
If weight on bit is increased to enhance penetration, then productivity improves, but bit whirl occurs causing bit damage
Solution Approach 1:
The indenting member performs preliminary stabilization by making initial contact with the borehole bottom and establishing a stable bit position before the cutting elements engage. This preliminary action prevents bit whirl by ensuring proper bit seating, allowing increased weight-on-bit for enhanced penetration without compromising stability.
Solution Approach 2:
The indenting member serves as a stabilizing intermediary that distributes weight-on-bit forces evenly across the bit structure. This mediation prevents uneven loading and bit whirl, maintaining bit stability while enabling higher weight application for improved penetration rate.
3Productivity
If depth of cut is increased to improve penetration rate, then productivity increases, but cutting elements wear excessively
Solution Approach 1:
The indenting member performs preliminary formation loading and stabilization, allowing the cutting elements to engage at optimized depths. This preliminary action enables controlled depth-of-cut management, improving penetration rate while preventing excessive cutting element wear through regulated loading sequences.
Data Source
AI summary
A drill bit has a bit body intermediate a working face and a shank end adapted for connection to a downhole drill string. The working face has at least three fixed blades converging towards a center of the working face and diverging towards a gauge of the bit, at least one blade having a cone region adjacent the center of the working face. The cone region increases in height away from the center of the working face and towards a nose portion of the at least one blade. An opening is formed in the working face at the center of the bit along an axis of the drill bit's rotation, the opening leading into a chamber with at least one wall. An indenting member is disposed within and extends from the opening, is substantially coaxial with the axis of rotation, and is fixed to the wall of the chamber.