Floating Electrode Drill Bit for Directional Pulsed Power Drilling
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Solution Overview
Problem
Conventional drilling methods struggle with efficiently directing and maintaining contact of the electrode in pulsed power drilling systems, leading to inefficiencies in drilling direction control and reliable ignition.
Innovation Solution
A pulsed power drill bit with a floating electrode system, utilizing a movable plate and actuators for tilting, tipping, and extending/retracting capabilities, coupled with a flexible connection and axial ball joints, allows for precise directional control and reliable ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional fixed electrode system is used in pulsed power drilling, then the structure is simple and rigid, but the directional control capability is poor and reliable ignition is difficult to achieve
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed electrode system to a floating electrode system that can dynamically adjust its position, orientation, and contact state. The electrode assembly includes a movable plate that can tilt and tip relative to the drill bit axis, allowing real-time adaptation to formation conditions and achievement of reliable ignition through controlled contact with the wellbore bottom.
Solution Approach 2:
The electrode system is segmented into multiple independent components including a fixed plate, movable plate, and actuator mechanisms. This segmentation allows each component to perform specific functions - the fixed plate provides structural support while the movable plate handles directional adjustment and contact control, resolving the contradiction between operational flexibility and structural simplicity.
2Manufacturing precision
If the electrode is made movable to improve directional control, then drilling direction can be precisely controlled, but the system complexity increases with multiple actuators and flexible connections
Solution Approach 1:
The floating electrode assembly serves multiple functions simultaneously: it provides electrical conduction for pulsed power delivery, acts as a directional control mechanism through tilting and tipping, and functions as a contact control system for reliable ignition. This multi-functionality reduces the need for separate systems for each function, thereby limiting the increase in overall system complexity while achieving precise directional control.
Solution Approach 2:
The flexible connection acts as an intermediary element between the rigid drill bit structure and the movable electrode assembly. It transmits mechanical movements from the actuators to the electrode while accommodating positional variations and maintaining electrical connectivity, thus enabling precise directional control without requiring complex rigid linkages.
3Reliability
If the electrode extends and retracts to facilitate reliable ignition, then ignition reliability improves, but the control system complexity increases
Solution Approach 1:
The extension and retraction functions are merged with the tilting and tipping movements in a unified floating electrode assembly. The same actuator system that controls directional orientation also manages contact state, eliminating the need for separate mechanisms and reducing overall control system complexity while maintaining high ignition reliability through controlled contact with the wellbore bottom.
Data Source
AI summary
An electro-crushing drill bit is to drill a wellbore, wherein the electro-crushing drill bit comprises a bit body; a ground structure coupled to the bit body; and at least one electrode coupled to a power source and the bit body, the at least one electrode positioned within the ground structure, wherein the at least one electrode comprises, a fixed plate; and a movable plate that is movable relative to the fixed plate.