Drill Head Electrode Layout for Water-Based Plasma Rock Fracturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotary drilling systems face high drill bit wear, low penetration rates, and poor efficiency when drilling through hard crystalline rock, making deep georesource extraction economically unfeasible.
Innovation Solution
A plasma pulse geo-drilling system with an optimized drill head start part featuring a specific arrangement of rod electrodes, using water-based drilling fluid, ensures efficient and continuous operation by generating plasma channels within the rock, preventing mechanical abrasion and maintaining stable high-voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional rotary drilling systems are used to drill through hard crystalline rock, then mechanical drilling can be performed, but drill bit wear is high and penetration rates are low
Solution Approach 1:
The patent replaces the mechanical drill bit system with an electrical plasma pulse system. High-voltage pulses are applied through rod electrodes to generate plasma channels that fracture the rock from the inside, eliminating mechanical abrasion and enabling high-speed drilling through hard crystalline rock without drill bit wear
Solution Approach 2:
The patent changes the physical state and properties of the drilling system by using high-voltage electrical pulses (nanosecond rising edge, several hundred kilovolts) to create plasma channels in the rock. This fundamental parameter change from mechanical force to electrical plasma energy enables breakthrough in hard rock drilling efficiency
2Reliability
If oil-based drilling fluid is used for insulation and flushing in PPGD, then plasma channel formation is maintained, but costs increase and environmental damage occurs
Solution Approach 1:
The patent changes the chemical composition parameter of the drilling fluid from oil-based to water-based (or water-glycol based). This parameter change maintains the necessary insulation and flushing properties while eliminating environmental contamination and reducing costs, making the PPGD system more sustainable and economically viable
3Use of energy by moving object
If the plasma channel propagates along the rock surface instead of through it, then easier plasma formation occurs, but effective rock fracture is not achieved
Solution Approach 1:
The patent uses multiple rod electrodes arranged in specific patterns (e.g., alternating polarity, hexagonal arrangement) to create three-dimensional plasma channels that propagate through the rock volume rather than along the surface. This dimensional approach ensures the plasma channel penetrates deep into the rock and fractures it effectively from the inside
4Productivity
If rapid pulse ramp-up is used to force plasma channel through rock, then rock fracture is achieved, but energy consumption increases
Solution Approach 1:
The patent optimizes the electrical pulse parameters including voltage amplitude (several hundred kilovolts), pulse duration (nanosecond rising edge), and frequency to achieve efficient rock fracture. By carefully controlling these parameters, the system maintains rapid plasma channel propagation through the rock while minimizing unnecessary energy consumption
Data Source
Figure 1~2a
Figure 2b~2c
Figure 3
AI summary
In the case of a drill head initial part (2) as part of a drill head for a plasma pulse geo drilling system, the drill head initial part (2) comprising at least one electrode section (20) which has a plurality of metal bar electrodes (200) and to which a high-voltage feed (10) can be attached and it being possible for differently polarized voltage pulses to be applied to the bar electrodes (200) by a high-voltage pulse generator (1), continuous drilling operation with increased efficiency is intended to be achieved when using water as drilling fluid. This is achieved in that a drill head connection section (21) in the form of a frame with feed struts (210) and at least two connection flanges (211, 211') is electrically connectedly attached to or integrally formed on the electrode section (20), and the bar electrodes (200) of the electrode section (20) are configured oriented with the same length (L) with diameters (d) of less than 20 mm in a manner running parallel to each other and terminating on a planar electrode face, a cross-sectional area (Q) of the electrode section (20) over which the bar electrodes (200) are distributed being selected to be larger than or equal to a cross-sectional area (q) of the drill head connection section (21) over which feed struts (210) and the at least two connection flanges (211, 211') are distributed.