Downhole Electromagnetic Unit for Resistivity Measurement
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Solution Overview
Problem
Current techniques for downhole formation evaluation, particularly for resistivity measurement, are costly and complex, often requiring duplicate devices and operations, and lack efficient alternatives for electromagnetic telemetry systems.
Innovation Solution
A formation evaluation system utilizing a downhole tool with a downhole electromagnetic unit and a surface electromagnetic unit that passes electromagnetic signals through the subterranean formation to determine parameters like resistivity, using an antenna, control circuitry, and processor to generate and modulate signals, and a sensor to detect measurement signals within the carrier signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional downhole formation evaluation tools are used, then formation parameters can be measured, but the system becomes costly and complex requiring duplicate devices and operations
Solution Approach 1:
The downhole electromagnetic unit is designed to perform multiple functions: it serves as both the primary communication system for telemetry and the formation evaluation tool for resistivity measurement. By integrating these functions into a single device, the patent eliminates the need for separate duplicate devices and operations, thereby reducing system complexity while maintaining measurement capability
Solution Approach 2:
The patent combines the electromagnetic communication function and formation evaluation function into a single integrated downhole unit. This merging of functions allows the same hardware and operational framework to serve dual purposes, reducing the overall system complexity and eliminating the need for separate evaluation tools
2Measurement precision
If traditional downhole formation evaluation tools are used, then formation parameters can be measured, but duplicate devices and operations are required
Solution Approach 1:
The downhole electromagnetic unit is designed to perform multiple functions: it serves as both the primary communication system for telemetry and the formation evaluation tool for resistivity measurement. By integrating these functions into a single device, the patent eliminates the need for separate duplicate devices and operations, thereby reducing system complexity while maintaining measurement capability
3Measurement precision
If electromagnetic signals are passed through the formation, then formation parameters can be determined, but signal attenuation occurs
Solution Approach 1:
The system employs feedback mechanisms where the surface unit receives electromagnetic signals from the downhole unit, processes them to determine formation parameters, and can adjust transmission parameters accordingly. This feedback loop allows for real-time optimization of signal strength and measurement accuracy, compensating for signal attenuation that occurs when electromagnetic signals pass through the formation
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 system provides a low-cost, efficient method to measure subterranean formation parameters without the need for duplicate devices, reducing complexity and enhancing the accuracy of resistivity measurements by using electromagnetic signals.
Implementation Method 1
A formation evaluation system utilizing a downhole tool with a downhole electromagnetic unit and a surface electromagnetic unit that passes electromagnetic signals through the subterranean formation
Implementation Method 2
a sensor to detect measurement signals within the carrier signal
Data Source
AI summary
A formation evaluation system for a subterranean formation penetrated by a wellbore. The formation evaluation system is provided with a downhole tool and a sensor. The downhole tool is positionable in the wellbore. The downhole tool has a downhole electromagnetic unit for communication with a surface electromagnetic unit. The sensor determines at least one wellsite parameter from the electromagnetic signal. The downhole tool and the surface electromagnetic unit are adapted to pass electromagnetic signals there between. The electromagnetic signals pass through the subterranean formation whereby the senor determines the at least one wellsite parameter from the electromagnetic signal.