Self-Powered Miniature Mobile Device for Downhole Monitoring
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Solution Overview
Problem
Current well monitoring technologies, such as wireline logging and MWD/LWD tools, are expensive, bulky, and limited in their ability to provide real-time data close to the drill bit, with risks of tool stuckage and inefficient data transmission, especially in high-temperature environments.
Innovation Solution
Development of self-powered, miniature mobile devices (MMDs) with integrated sensors and a power generator that harnesses mechanical and hydraulic energies through friction between materials of opposite polarities to power sensors and communication modules, allowing for wireless data transmission and real-time monitoring of downhole conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireline logging tools are used to obtain downhole data, then measurement capability is improved, but operation time and cost increase due to multiple trips required
Solution Approach 1:
The logging tool is equipped with self-powered vibration generation capability, allowing it to generate its own excitation signals through vibration motors or piezoelectric elements. This eliminates the need for external vibration sources and multiple trips, enabling continuous measurement while the tool remains in the wellbore.
Solution Approach 2:
The tool integrates multiple functions including measurement sensors, vibration generation, and self-powering capabilities into a single device. This multi-functional design allows the tool to perform both measurement and self-excitation without requiring separate equipment or multiple operations.
2Productivity
If MWD/LWD tools are used for real-time monitoring, then data transmission capability is improved, but device size and complexity increase
Solution Approach 1:
The vibration generation function is extracted from a complex mechanical system and implemented as integrated vibration motors or piezoelectric elements within the tool. This simplifies the overall device structure while maintaining real-time monitoring capabilities.
Solution Approach 2:
Traditional mechanical vibration generation systems are replaced with more compact electromagnetic vibration motors or piezoelectric actuators. This substitution reduces device complexity and size while enabling real-time data transmission through integrated sensors.
3Measurement precision
If logging tools are placed close to the drill bit for near-bit measurements, then measurement relevance is improved, but sensor reliability decreases due to harsh environment
Solution Approach 1:
The tool employs different material properties and protective measures at different locations. Sensors are placed in protected zones with appropriate shielding and housing, while vibration-generating elements are positioned in areas that can withstand harsher conditions. This localized optimization allows near-bit measurements while protecting sensitive components.
4Measurement precision
If multiple logging runs are required to obtain complete formation data, then measurement completeness is improved, but operational cost increases
Solution Approach 1:
The tool is designed to perform continuous measurements during a single drilling operation. The integrated vibration generation and sensing system operates continuously as the tool moves through the wellbore, eliminating the need to pull the tool for intermediate measurements and reducing operational costs.
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 MMDs provide a cost-effective, flexible, and real-time monitoring solution that can operate in high-temperature environments, reducing the risk of tool stuckage and enhancing data resolution and transmission speed, enabling safer and more efficient drilling operations.
Implementation Method 1
a power generator that generates power based on friction, generated by fluid or mud flow, between two materials of opposite polarity
Data Source
AI summary
High temperature miniature mobile device includes a power generator including a first material of one polarity and a second material that is fixed in position and is of opposite polarity of the first material, wherein the first material is propelled towards or slid against the second material based on motion of the miniature mobile device so that the two materials have a maximized point of contact to generate maximum power, an electrode that is connected to the first material or second material, a bridge rectifier connected to the electrode to transform the power generated into direct current from alternating current, a storage unit for storing the power generated by the power generator, a sensor that gathers information concerning a downhole environment, and a microcontroller and transceiver unit to manage the power generated by the power generator and transmit information gathered by the sensor.