RF Coaxial Sleeve Heating for Heavy Oil Extraction
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Solution Overview
Problem
Current methods for extracting heavy oil, extra heavy oil, and bitumen from geological formations are inefficient due to high viscosity, requiring complex and costly heating techniques such as steam injection, which can be impractical in water-scarce regions or permafrost areas, and existing RF heating systems are complex and require specially constructed wells.
Innovation Solution
An apparatus using RF energy coupled to a well structure with a closed electrical circuit to induce RF currents in conductive materials, creating a near-field heating effect that heats surrounding hydrocarbon deposits without the need for complex well constructions, utilizing a conventional well configuration to transmit and radiate RF energy effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam injection is used to heat hydrocarbon deposits, then the hydrocarbon materials can be heated for extraction, but water resources are consumed and permafrost may melt
Solution Approach 1:
The patent replaces the mechanical/thermal system of steam injection with an electromagnetic field-based RF heating system. The well structure acts as an RF antenna that generates electromagnetic fields to directly heat hydrocarbon deposits through dielectric heating, eliminating the need for water-based steam generation and injection.
2Temperature
If specially constructed wells with RF emitting structures are used for RF heating, then heating of hydrocarbon deposits can be achieved, but device complexity and construction costs increase
Solution Approach 1:
The patent makes the well structure multi-functional by designing it to serve both as a conventional well for hydrocarbon extraction and as an RF emitting antenna for heating. The conductive well structure and associated equipment can generate and transmit RF energy, eliminating the need for separate specialized RF emitting structures and reducing overall system complexity.
Solution Approach 2:
The patent combines the well structure with RF emitting capabilities by integrating conductive elements and RF generation equipment into the existing well infrastructure. This merging of functions allows the same structure to perform both extraction and heating 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
This approach enables efficient heating of hydrocarbon deposits by inducing RF currents in well structures, achieving targeted temperature control and reducing extraction costs by avoiding the need for steam injection and complex RF emitting structures, while being adaptable to various geological formations.
Implementation Method 1
a well structure that provides a closed electrical circuit to drive RF energy into the well
Implementation Method 2
creating a near-field heating effect that heats surrounding hydrocarbon deposits
Data Source
AI summary
An apparatus for radiating RF energy from a well structure that provides a circuit through which RF power may be driven to heat a hydrocarbon deposit that is susceptible to RF heating. The apparatus includes a source of RF power connected at one connection to a conductive linear element, such as a well bore pipe, and at a second connection to a conductive sleeve that surrounds and extends along the linear conductive element. The sleeve extends along the linear conductive element to a location between the connection of the source of RF energy to the linear conductive element and an end of the linear conductive element where the sleeve is conductively joined near to the linear conductive element. The apparatus may include a transmission section that extends from a geologic surface to connect to a radiating apparatus according to the invention.