Quasi-Optical Waveguide for Downhole Telemetry

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Solution Overview

Problem

Current methods for downhole telemetry in oil and gas exploration face limitations in information bandwidth and signal loss, particularly with electrical cables and optical fibers, which are not suitable for the harsh downhole environment.

Innovation Solution

A quasi-optical waveguide that operates in the terahertz frequency range, using a cylindrical body with thin, transparent dielectric windows and a vacuum or gas-filled chamber to propagate signals efficiently, reducing signal loss and maintaining alignment without the need for precise optical alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If optical fiber cables are used for high speed communications, then information bandwidth is improved, but alignment precision requirements increase

Engineering Contradiction:

Improveinformation bandwidthVSAvoidoptical alignment precision

Core Design Contradiction:

Loss of informationVSManufacturing precision

Solution Approach 1:

The patent replaces the mechanical/optical alignment system with a waveguide system that uses electromagnetic field confinement. Instead of relying on precise physical alignment of optical fibers, the invention uses a waveguide structure with conductive walls and dielectric coating to guide terahertz waves, substituting mechanical precision requirements with electromagnetic field-based guidance that is inherently more tolerant of misalignment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating frequency parameter to the terahertz range (0.1-10 THz) and changes the transmission medium from optical fiber to waveguide structure. This parameter change allows achieving high information bandwidth while using a structure that does not require near-perfect alignment, as the waveguide confines and guides the electromagnetic waves through its structural design rather than relying on precise component alignment.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If electrical cables are used for communications, then device complexity is reduced, but information bandwidth is limited

Engineering Contradiction:

Improvecable structure simplicityVSAvoidinformation bandwidth

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The patent changes the frequency parameter from traditional electrical communication frequencies to the terahertz range (0.1-10 THz). This parameter change enables the waveguide to achieve information bandwidth comparable to optical fibers while maintaining a relatively simple waveguide structure without the need for complex optical components or precise alignment mechanisms.

Inventive Principle:

Principle #35Parameter changes

3Loss of information

If optical fiber cables are used, then information bandwidth is improved, but reliability in harsh environment decreases

Engineering Contradiction:

Improveinformation bandwidthVSAvoiddownhole environment reliability

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent replaces the optical fiber system with a waveguide system that uses electromagnetic field confinement within a protective structure. The waveguide with conductive walls and dielectric coating provides mechanical protection and environmental isolation, substituting the fragile optical fiber system with a more robust electromagnetic field-based transmission system suitable for harsh downhole conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs a composite structure combining conductive walls (metal or conductive material) with dielectric coating materials. This composite construction provides both electromagnetic field confinement and environmental protection, creating a reliable transmission system that can withstand the mechanical stress, temperature variations, and other harsh conditions of the downhole environment while maintaining high information bandwidth.

Inventive Principle:

Principle #40Composite materials

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

Enables reliable high-speed communication at data bandwidths comparable to optical fibers, overcoming the limitations of electrical cables and optical fibers, while withstanding the extreme conditions of the downhole environment.

Implementation Method 1

a waveguide having a chamber formed by a substantially cylindrical body and configured to propagate terahertz radiation

Methodology Applied

Scientific EffectElectromagnetic radiation propagation: Electromagnetic Induction

Implementation Method 2

a plurality of windows, each window coupled to a respective end of the waveguide such that the chamber is substantially sealed from ambient atmosphere, wherein the plurality of windows are transparent to the terahertz radiation

Methodology Applied

Scientific EffectDielectric transparency to electromagnetic radiation: Dielectric

Data Source

PatentUS9983331B2Quasi-optical waveguide

Publication Date: 2018.05.29 HALLIBURTON ENERGY SERVICES INC

AI summary

A quasi-optical waveguide apparatus includes a waveguide having a chamber formed by a substantially cylindrical body and configured to propagate terahertz radiation. A plurality of windows are included wherein each window is coupled to a respective end of the waveguide such that the chamber is substantially sealed from the ambient atmosphere. The plurality of windows are transparent to the terahertz radiation.