Axial RF Coupler for Hydrocarbon Deposit Heating
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Solution Overview
Problem
Current methods for heating hydrocarbon materials in geological subsurface formations, such as steam-assisted gravity drainage (SAGD), require significant water usage, which is energy-intensive and environmentally costly, and are not suitable for all types of deposits like bituminous ore, oil sands, and heavy oil, especially those shallow or lacking sufficient caprock.
Innovation Solution
The use of radio frequency (RF) electromagnetic fields emitted by well casings connected to an RF energy source to heat hydrocarbon materials, including bituminous ore, oil sands, and heavy oil, by coupling RF energy to pipes positioned within the geological deposit and controlling the phase relationship of the RF energy to create a desired heating field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam-assisted gravity drainage (SAGD) is used to heat hydrocarbon deposits, then heating effectiveness is improved, but water usage increases significantly requiring large energy input for water removal
Solution Approach 1:
The patent replaces the thermal-mechanical steam injection system with an electromagnetic RF heating system. RF electromagnetic fields are applied directly to the hydrocarbon deposit through well casings or dedicated antennas, eliminating the need for steam generation and water injection. The RF energy directly heats the bitumen and surrounding formation through dielectric heating and conduction, achieving the required temperatures without introducing large volumes of water that would later require energy-intensive separation and removal.
2Temperature
If traditional dipole antennas are used for RF heating, then heating capability is achieved, but device complexity and structural requirements increase
Solution Approach 1:
The patent makes the well casing itself serve dual functions: as the structural well bore liner and as the RF heating antenna. The conductive well casing acts as a monopole or dipole antenna when coupled to RF power, eliminating the need for separate antenna structures. This universal application of the well casing reduces device complexity while maintaining effective RF heating capability throughout the hydrocarbon deposit.
Solution Approach 2:
The patent merges the well casing structure with the RF antenna function into a single integrated system. Rather than installing separate antennas within the well, the well casing itself is used as the radiating element by applying RF power through coupling devices attached to the casing. This combination simplifies the overall system architecture and reduces the number of components required for effective RF heating.
3Productivity
If steam injection is used for heating, then hydrocarbon extraction is enabled, but environmental impact and processing costs increase
Solution Approach 1:
The patent substitutes the steam-based thermal system with an electromagnetic RF heating system, eliminating water injection and the associated environmental issues. RF heating directly heats the hydrocarbon deposit through electromagnetic field interaction with the bitumen and formation materials, achieving the necessary temperature increase for viscosity reduction and flow without introducing foreign substances that would require separation, treatment, or disposal.
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 method reduces water usage, provides efficient and environmentally friendly heating, and is effective for extracting hydrocarbons from deposits that are not suitable for traditional steam injection methods, allowing for deeper penetration and efficient resource extraction without the need for direct electrical contact.
Implementation Method 1
an axial RF coupler that couples RF energy to drive a linear conductive element, such as a drill pipe, with RF energy
Implementation Method 2
heating of the deposits to separate hydrocarbons from other geologic materials and to maintain hydrocarbons at temperatures at which they will flow
Implementation Method 3
heating of hydrocarbon materials in geological subsurface formations by radio frequency (RF) electromagnetic fields
Implementation Method 4
radio frequency (RF) electromagnetic fields emitted by well casings that are coupled to an RF energy source
Data Source
AI summary
An apparatus for heating a hydrocarbon deposit that is susceptible to RF heating by coupling a linear conductive element that extends into the material to a source of RF power. The apparatus includes a source of RF power connected to driving winding that extends around a magnetic core loop and the magnetic core loop extends around the RF conductive linear element. One or more apparatus may be used to couple RF energy to conductive elements that extend into a hydrocarbon deposit to achieve a desired RF current within the element. RF energy may be coupled to conductive elements that are adjacent to each other within a hydrocarbon deposit to create a desired region of heating within the hydrocarbon deposit. The magnetic core loop may start and stop the RF energy to position heating.