Insulated Conductor Cable for Downhole Telemetry Signal Strength
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Solution Overview
Problem
Current electromagnetic wireless telemetry systems in wellbores face challenges in achieving strong signal transmission due to small voltage differences between measurement points, often requiring expensive centralizers or insulated gaps, which are costly and inefficient.
Innovation Solution
An electromagnetic wireless telemetry system using an insulated electrically conductive member coupled to a tubing string at upper and lower measuring points, with a processing unit to process and transmit voltage differences across this member, allowing for increased signal strength by extending the distance between measuring points with a relatively inexpensive conductor cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulated gap or centralizer is used to provide measurement points, then signal transmission is enabled, but device complexity and cost increase
Solution Approach 1:
The patent extracts the insulating function from complex mechanical structures (centralizers, insulated gaps) and implements it through a simple insulated conductor cable that provides electrical isolation between measurement points without requiring additional mechanical components
Solution Approach 2:
The patent replaces expensive, complex centralizers and insulated gap structures with a simple, inexpensive insulated conductor cable that can be easily installed and removed, reducing overall system cost and complexity while maintaining signal transmission capability
2Measurement precision
If the distance between measuring points is increased to improve signal strength, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent introduces an insulated conductor cable as an intermediary element that enables increased distance between measurement points while maintaining electrical isolation and signal integrity, avoiding the need for complex mechanical structures like centralizers
Solution Approach 2:
The patent replaces mechanical structures (centralizers, insulated gaps) with an electrical solution using an insulated conductor cable to achieve the same functional result of providing separated measurement points with improved signal strength
3Loss of information
If voltage difference measurement is used for signal reception, then electromagnetic telemetry is achieved, but the measured voltage difference is very small requiring expensive equipment
Solution Approach 1:
The patent changes the measurement parameters by using an insulated conductor cable to create a more favorable electrical configuration that produces larger voltage differences for the same signal strength, reducing the need for expensive high-precision measurement equipment
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 approach enhances signal strength economically by increasing the distance between measuring points, providing a cost-effective and efficient method for both receiving and sending signals between the surface and downhole tools, suitable for various downhole tools and operations.
Implementation Method 1
an insulated electrically conductive member electrically coupled to the tubing string at an upper measuring point and a lower measuring point, and a processing unit configured to process a voltage difference measured between the upper measuring point and the lower measuring point across the insulated electrically conductive member
Implementation Method 2
wireless electromagnetic telemetry in which electromagnetic waves are transmitted through the earth and casing in the wellbore
Data Source
AI summary
A downhole electromagnetic telemetry unit for use with a tubing string (5) includes an insulated electrically conductive member (31) and a processing unit (15). The insulated electrically conductive member (31) is electrically coupled to the tubing string (5) at an upper measuring point (23) and a lower measuring point (25). The processing unit (15) is configured to process a voltage difference measured between the upper measuring point (23) and the lower measuring point (25) across the insulated electrically conductive member (31) and to derive therefrom a signal transmitted from a surface location (13).