RF Antenna Assembly With Dielectric Isolator For Wellbore Heating

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Solution Overview

Problem

Current hydrocarbon extraction methods, such as Steam-Assisted Gravity Drainage (SAGD), face challenges like long production times, significant heat loss, excessive steam consumption, high costs, and environmental impact due to water usage, particularly in regions like permafrost areas or those with thin payzones or shale interlayers, where RF heating may be difficult to integrate into existing wells.

Innovation Solution

An RF antenna assembly with a dielectric isolator, comprising tubular conductors and a dielectric tube with connectors and passageways, is positioned within a wellbore to efficiently apply RF energy for hydrocarbon recovery, providing mechanical robustness and electrical efficiency while minimizing heat loss and water consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If SAGD process is used for heavy oil extraction, then production efficiency is improved, but heat loss and steam consumption increase significantly

Engineering Contradiction:

Improveproduction efficiencyVSAvoidheat loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent replaces the thermal field-based SAGD process with an electromagnetic field-based RF heating system. RF energy is transmitted through the wellbore using antennas and waveguides, directly heating the heavy oil and sand formation without requiring external steam injection. This substitution of heating mechanism eliminates the heat loss associated with steam generation and transport, while maintaining effective viscosity reduction for oil flow.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts the essential function of heating from the steam generation system and isolates it within the wellbore environment. By using RF heating equipment positioned inside the wellbore, the system delivers heating energy directly to the target formation, removing the intermediate heat transfer steps that cause energy loss in conventional SAGD processes.

Inventive Principle:

Principle #2Taking out (Extraction)

2Productivity

If SAGD process is used for heavy oil extraction, then production efficiency is improved, but water consumption and environmental impact increase

Engineering Contradiction:

Improveproduction efficiencyVSAvoidwater consumption

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent substitutes the water-based steam injection system with an electromagnetic field-based RF heating system. This replacement eliminates the need for large volumes of water to be pumped, boiled, and injected into the formation, thereby conserving water resources and reducing the environmental burden associated with water consumption and wastewater management.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If RF heating equipment is integrated into existing wells, then adaptability is improved, but installation complexity increases

Engineering Contradiction:

Improveadaptability to existing wellsVSAvoidinstallation complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The RF heating system is divided into modular components including antennas, waveguides, and RF power units that can be installed in discrete sections within the wellbore. This segmentation allows for step-by-step installation in existing wells without requiring complete well reconstruction, thereby reducing overall installation complexity while maintaining adaptability to various well configurations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The RF heating equipment is designed with universal mounting interfaces and configurable antenna arrays that can accommodate different wellbore diameters, depths, and geological conditions. This multi-functionality enables the same basic system architecture to be deployed across various existing well types, simplifying the installation process by reducing the need for custom-designed solutions for each well.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 RF antenna assembly enhances hydrocarbon recovery efficiency by reducing production time, minimizing heat loss, and conserving water resources, making it suitable for various geological conditions and existing well installations.

Implementation Method 1

a dielectric isolator between the inner conductor and the outer conductor, the dielectric isolator comprising a dielectric tube

Methodology Applied

Scientific EffectDielectric isolation: Dielectric

Implementation Method 2

RF antenna assembly configured to be positioned within a wellbore in a subterranean formation for hydrocarbon recovery

Methodology Applied

Scientific EffectRF heating: Dielectric Heating

Data Source

PatentUS9322256B2RF antenna assembly with dielectric isolator and related methods

Publication Date: 2016.04.26 HARRIS CORP

AI summary

An RF antenna assembly is positioned within a wellbore in a subterranean formation for hydrocarbon resource recovery. The RF antenna assembly includes first and second tubular conductors and a dielectric isolator therebetween. The dielectric isolator includes a dielectric tube having opposing first and second open ends, a first tubular connector having a first slotted recess receiving therein the first open end of the dielectric tube, and a second tubular connector having a second slotted recess receiving therein the second open end of the dielectric tube.