Downhole EM Telemetry Circuit for High-Temperature Power Pulses
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Solution Overview
Problem
Current downhole power sources for oil and gas exploration, such as batteries and generators, face limitations in providing consistent high power pulses at elevated temperatures, leading to instrument failure and costly drilling operations, while existing electromagnetic (EM) telemetry tools struggle to transmit high power signals effectively at depths due to signal attenuation and efficiency issues.
Innovation Solution
The development of an EM telemetry device capable of transmitting pulsed high power EM signals with peak or average pulse power ranging from 20 W to 2000 W, operating up to 200°C, using high temperature rechargeable energy storage devices (HTRESDs) and efficient power converters, enabling deeper drilling and faster data transmission rates.
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 power source is segmented into two distinct components: a conventional battery for continuous low-power operation and a high-temperature rechargeable energy storage device (HTRESD) for high instantaneous power pulses. This segmentation allows each component to operate within its optimal performance range, resolving the contradiction between continuous power provision and high power pulse capability while maintaining temperature tolerance.
Solution Approach 2:
The patent merges two different power source technologies into a hybrid system. The battery and HTRESD are combined to create a composite power source that leverages the strengths of both: the battery's continuous operation capability and the HTRESD's high power pulse and temperature tolerance capabilities. This merging resolves the technical contradiction by achieving both continuous power and high instantaneous power with temperature resilience.
2Power
If high rate batteries are used to meet high instantaneous power demand, then power requirements are satisfied, but capacity is reduced and susceptibility to catastrophic failure at elevated temperatures increases
Solution Approach 1:
The power delivery function is segmented between two devices: the conventional battery provides continuous power at lower rates, preserving its capacity, while the HTRESD handles high instantaneous power demands. This segmentation allows the battery to operate within its optimal capacity range while still meeting overall power requirements through the combined system.
Solution Approach 2:
The HTRESD acts as an intermediary power device that bridges the gap between the battery's limited instantaneous power capability and the instrument's high power demands. It receives power from the battery during low-demand periods and delivers high power pulses during peak demand, effectively mediating the power transfer while preserving battery capacity.
3Productivity
If EM telemetry tools transmit high power signals at depth, then data transmission rate improves, but signal attenuation increases and efficiency decreases
Solution Approach 1:
The EM telemetry system uses periodic pulsed transmission instead of continuous signaling. The HTRESD delivers high power in controlled pulses, allowing the signal to be transmitted at peak power only when necessary, reducing overall energy loss from continuous transmission while maintaining high data transmission rates during active pulse periods.
Solution Approach 2:
The system dynamically changes transmission parameters including power level, pulse duration, and frequency based on depth, signal quality, and data priority. This allows optimization of the balance between transmission rate and energy loss by adjusting parameters in real-time rather than using fixed high power continuous transmission.
4Length of moving object
If drilling depth is increased to access deeper resources, then resource exploration capability improves, but temperature increases causing instrument failure
Solution Approach 1:
The system changes the temperature parameter tolerance by introducing HTRESDs that are specifically designed to operate at high temperatures (200°C to 300°C). This parameter change in thermal tolerance allows instruments to function at greater depths where temperatures would previously cause failure, directly enabling extended drilling depth.
Solution Approach 2:
The power system uses composite construction combining conventional battery materials with high-temperature resistant HTRESD materials. This composite approach creates a power source that maintains functionality across the extended temperature range encountered at greater depths, resolving the temperature limitation barrier to deeper drilling.
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 solution provides consistent and efficient high power EM signals, extending drilling depths, improving power management, and enabling real-time two-way communication, reducing operational costs and hazards by overcoming the limitations of existing power sources and EM 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.