Downhole Power Conditioning for Pulse Drilling
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Solution Overview
Problem
The inefficiency of electrical energy transmission from the surface to the drill bit in pulse power drilling due to high voltage and current losses, leading to reduced drilling efficiency and safety concerns.
Innovation Solution
A power conditioning system integrated within the pulse power drilling assembly that utilizes a turbine and alternator combination to generate electrical power downhole, which includes components like AC to DC converters, induction elements, voltage protection circuits, and solid-state transformers to condition and boost the electrical power for efficient use at the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electrical power is transmitted from the surface to the drill bit, then the drilling operation can be performed, but transmission losses occur reducing efficiency
Solution Approach 1:
Instead of transmitting power from the surface down to the drill bit, the patent inverts the approach by generating power at the drill bit location using a downhole alternator driven by drilling fluid flow, eliminating transmission losses entirely
Solution Approach 2:
The system uses the kinetic energy of the drilling fluid flow itself to drive the alternator and generate the electrical power needed for pulse power drilling, making the system self-powered without external power transmission requirements
2Power
If high voltage electrical power is transmitted downhole, then pulse power drilling can be achieved, but safety concerns arise
Solution Approach 1:
The patent inverts the power delivery approach by generating high voltage power at the point of use (downhole) rather than transmitting it from the surface, eliminating the safety hazards associated with high voltage transmission through drill pipe and connections
3Loss of energy
If power conditioning components are added downhole, then electrical efficiency improves, but device complexity increases
Solution Approach 1:
The patent combines multiple power conditioning functions (rectification, voltage regulation, pulse generation) into a single integrated downhole power conditioning system that directly processes alternator output, reducing the number of separate components and simplifying the overall system architecture
Solution Approach 2:
The downhole power conditioning system acts as an intermediary between the alternator and the pulse power drilling mechanism, conditioning the electrical power locally to improve efficiency while maintaining a manageable system through functional integration
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 solution reduces transmission losses, enhances electrical efficiency, and improves safety by generating and conditioning electrical power close to the drilling site, enabling more effective borehole advancement with reduced energy wastage and increased operational safety.
Implementation Method 1
a turbine and alternator combination that when positioned downhole and provided with a flow of drilling fluid, is configured to generate electrical power
Implementation Method 2
a turbine and alternator combination that when positioned downhole and provided with a flow of drilling fluid, is configured to generate electrical power
Data Source
AI summary
A power condition system is disclosed for conditioning power for charging of at least one capacitive element of a pulse power electrode, where the electrical power is received from at least one of a downhole alternator or generator. The received electrical power is rectified and controlled for both voltage and current amplitude. The electrical power is then split into two parallel square wave signals. The electrical power is then transformed, using parallel high frequency high voltage transformers, to a high voltage signal. The high voltage signals are rejoined and rectified to produce a high voltage DC signal. The DC signal is smoothed at a high capacity inductor and output via a switching element to at least one capacitive element of the pulse power electrodes.