Adaptive Depth of Cut Drill Bit Elements
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Solution Overview
Problem
Conventional drill bits with depth of cut control (DOCC) elements are stationary and unevenly control the depth of cut, leading to vibration and reduced drilling efficiency, especially in directional drilling where compressive strength of formations changes with depth.
Innovation Solution
A drill bit design where DOCC elements and gauge elements are coupled to adaptively adjust their position based on wellbore conditions and weight on bit, allowing for optimal depth of cut and enhanced stability by retracting or extending in response to changing wellbore widths during vertical, lateral, and curved drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional DOCC elements are disposed on external surfaces of drill bits and remain stationary during the entire drilling run, then the device complexity is reduced, but the depth of cut control becomes uneven and causes vibration
Solution Approach 1:
The DOCC elements are designed to move relative to the drill bit surface, transitioning from stationary to dynamic positioning. The gauge elements engage with the wellbore wall and through mechanical coupling, this motion is transmitted to the DOCC elements, allowing them to adjust their protrusion depth automatically in response to wellbore conditions, thereby achieving uniform depth of cut control without increasing overall system complexity
Solution Approach 2:
The system implements passive feedback through mechanical coupling between gauge elements and DOCC elements. As gauge elements contact the wellbore wall and experience varying forces, this feedback is mechanically transmitted to adjust DOCC element positions, enabling automatic adaptation to changing wellbore conditions and formation strengths throughout the drilling run
2Ease of operation
If stationary DOCC elements are used, then the ease of operation is improved, but the adaptability to changing wellbore conditions deteriorates
Solution Approach 1:
The DOCC elements perform self-adjustment through passive mechanical coupling with gauge elements. The system requires no external control or power source - the DOCC elements automatically position themselves based on forces transmitted from gauge elements engaging the wellbore wall, enabling the drill bit to adapt to varying wellbore widths and formation conditions throughout the drilling run
3Manufacturing precision
If conventional stationary DOCC elements are used, then the manufacturing precision is simplified, but the drilling efficiency and uniformity of wear deteriorate
Solution Approach 1:
The DOCC elements transition from fixed stationary positions to dynamic adjustable positions through mechanical coupling with moving gauge elements. This allows the cutting elements to maintain optimal depth of cut throughout the drilling run, improving drilling efficiency and preventing uneven wear that would otherwise occur with stationary DOCC elements
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 adaptive depth of cut control and stabilization improve drilling efficiency, reduce torque fluctuations, and extend the life of the drill bit by minimizing stick slip and wear, enhancing performance in varying formation strengths.
Implementation Method 1
The first element and the second element may be configured to act as pistons that move in opposite directions when one of the first element or the second element is retracted due to forces from the wellbore
Data Source
AI summary
The disclosure provides a drill bit including a bit body and a blade extending from the bit body. The blade includes a first element protruding from a surface of the blade and a second element protruding from the surface of the blade. The first element and the second element are each configured to extend or retract relative to the surface of the blade and are coupled to each other such that when the second element retracts relative to the surface of the blade, the first element extends relative to the surface of the blade. The first element is disposed within a first pocket formed in the surface of the blade, and the second element is disposed within a second pocket formed in the surface of the blade. A communication channel is formed between the first pocket and the second pocket.