Non-conductive Composite Wellbore Instrument Housing
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Solution Overview
Problem
Existing wellbore instrumentation housings are heavy, expensive, and lack the necessary properties of high temperature, high pressure, abrasive resistance, chemical resistance, and energy transparency, making them unsuitable for efficient energy interaction with rock formations.
Innovation Solution
A composite housing structure using an electrically non-conductive tube surrounded by layers of fiber, including carbon fibers arranged to minimize closed loops, embedded in a resin matrix, providing strength, resistance, and transparency to electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel or metal alloy housings are used, then strength and pressure resistance are improved, but weight and cost increase
Solution Approach 1:
The patent applies composite materials by combining an electrically non-conductive tube (such as PEEK or other high-performance polymers) with fiber reinforcement layers. This composite structure achieves the required mechanical strength and pressure resistance while significantly reducing weight compared to traditional metal housings. The non-conductive nature of the base tube provides inherent electrical isolation, while the fiber layers add structural integrity.
2Strength
If metal housings are used, then strength is improved, but manufacturing cost increases
Solution Approach 1:
The composite construction using molded non-conductive tubes and layered fiber composites enables more efficient manufacturing processes compared to metal fabrication. The tube can be molded in one piece, and fiber layers can be applied through automated winding or laying processes, reducing labor costs and manufacturing complexity while maintaining strength requirements.
3Power
If conductive materials are used for electromagnetic coils, then electromagnetic performance is improved, but electrical interference with wellbore instruments increases
Solution Approach 1:
The electrically non-conductive tube serves as an intermediary barrier between the electromagnetic coils and the wellbore environment. It provides electrical isolation that prevents harmful electrical interference with other instruments while allowing the coils to maintain their conductive structure for optimal electromagnetic performance. The tube acts as a protective interface that decouples the electromagnetic system from the conductive wellbore environment.
4Strength
If traditional housings are used, then structural integrity is maintained, but energy transparency for rock formation interaction is reduced
Solution Approach 1:
The composite material selection, particularly the non-conductive tube material and fiber composition, is optimized to be transparent to the electromagnetic energies used in rock formation interaction. The material structure allows electromagnetic energy to pass through with minimal attenuation while maintaining the mechanical strength required for wellbore conditions. This enables efficient energy transfer to the rock formations for drilling and measurement operations.
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 composite housing structure reduces weight and manufacturing costs while maintaining strength and energy transparency, enhancing the performance of well logging instruments by allowing efficient energy interaction with rock formations.
Implementation Method 1
The at least one carbon fiber is arranged to have substantially no closed loops therein... providing strength, resistance, and transparency to electromagnetic radiation
Implementation Method 2
at least one layer of fiber embedded in a matrix surrounding an exterior of the tube... bonding the at least one layer of fiber to an exterior of the tube
Data Source
AI summary
A well logging instrument housing includes an electrically non-conductive tube and at least one layer of fiber embedded in a matrix surrounding an exterior of the tube. The at least one fiber layer includes at least one carbon fiber. The at least one or carbon fiber is arranged to have substantially no closed loops.