Pulsed EM Telemetry Circuit for High-Temperature Downhole Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current downhole power sources for oil and gas exploration, such as batteries and generators, face limitations in providing high power pulses efficiently at elevated temperatures, leading to instrument failure and costly drilling operations, while existing EM telemetry tools struggle to transmit high power signals effectively at great depths due to signal attenuation and efficiency issues.
Innovation Solution
The development of an electromagnetic (EM) telemetry device capable of transmitting high power pulsed signals with peak or average pulse power ranging from 20 W to 2000 W, utilizing high temperature rechargeable energy storage devices (HTRESDs) and efficient power converters to manage power effectively in harsh downhole environments, and a topside receiver system to decode these signals with a bit rate of at least 1 bit per second.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional batteries are used as downhole power sources, then they can provide continuous power, but they suffer catastrophic failure at elevated temperatures and cannot provide high instantaneous power pulses
Solution Approach 1:
The patent combines a battery and a capacitor in parallel to form a hybrid power source. The battery provides continuous low-power operation, while the capacitor delivers high instantaneous power pulses. This merging allows the system to overcome the limitations of individual components, providing both continuous power and high pulse capability without catastrophic failure at elevated temperatures.
Solution Approach 2:
The patent implements dynamic power management by using a controller to switch between battery-only mode, capacitor-only mode, and hybrid mode based on power requirements. During high-power pulse events, the capacitor is activated to supplement battery power. During normal operation, the battery operates alone, conserving capacitor energy. This dynamic adaptation allows the system to optimize performance and reliability under varying conditions.
2Power
If high rate batteries are used to meet high instantaneous power demand, then power delivery is improved, but capacity is reduced and susceptibility to catastrophic failure at elevated temperatures increases
Solution Approach 1:
The patent merges a high-rate capacitor with a low-rate battery to create a hybrid power source. The capacitor provides the high instantaneous power delivery needed for pulsed operations, while the battery provides continuous energy storage. This combination allows the system to achieve high power delivery without sacrificing total energy capacity, as the battery serves as the primary energy reservoir.
Solution Approach 2:
The patent uses the capacitor to provide excessive power delivery capability during pulse events, exceeding what the battery alone could provide. The capacitor is over-specified for continuous operation but is activated only during high-power pulse events, providing the necessary power surge without requiring the battery to be oversized for continuous high-power operation, thus preserving battery capacity.
3Loss of information
If EM telemetry tools transmit high power signals at great depths, then communication capability is improved, but signal attenuation and efficiency issues worsen
Solution Approach 1:
The patent employs periodic pulsed transmission instead of continuous transmission. The EM telemetry tool transmits high-power signals in periodic pulses, allowing the capacitor to discharge during transmission events and recharge during intervals. This periodic action reduces average power consumption and energy loss while maintaining peak transmission capability, improving communication at depth without excessive energy depletion.
Solution Approach 2:
The patent dynamically changes transmission parameters including power level, pulse duration, and duty cycle based on depth, signal quality, and power availability. The controller adjusts these parameters in real-time to optimize signal transmission capability while minimizing energy loss. This adaptive parameter adjustment allows the system to maintain effective communication at great depths without wasting energy on excessive transmission power.
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
Enables consistent and efficient high power EM signal transmission, allowing for deeper drilling operations, improved power management, extended runtime, and real-time communication between the surface and downhole tools, overcoming the limitations of existing power sources and telemetry tools.
Implementation Method 1
an EM telemetry circuit capable of transmitting a pulsed high power EM telemetry signal
Data Source
AI summary
In one aspect, an electromagnetic (EM) telemetry device is disclosed including an EM telemetry circuit capable of transmitting a pulsed high power EM telemetry signal, wherein the high power EM telemetry signal has a peak or average pulse power of about 20 W to about 2000 W.