RF Guided Wave Array for Shale Energy Extraction
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Solution Overview
Problem
Current methods for extracting oil and gas from low permeability hydrocarbon bearing strata require significant water usage, leading to environmental concerns and inefficiencies, particularly in hydraulic fracturing, which also limits the recovery of oil and gas from subsurface deposits.
Innovation Solution
A system utilizing a three-dimensional underground electromagnetic array to guide RF energy for heating the hydrocarbon bearing strata, increasing permeability and inducing pyrolysis with minimal water usage, by employing RF transmission lines and well pipe segments to create a guided wave structure that enhances oil and gas extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic fracturing is used to extract oil and gas from low permeability strata, then oil and gas recovery is improved, but water consumption increases significantly
Solution Approach 1:
The patent replaces the mechanical hydraulic fracturing system with an electromagnetic field-based system. RF transmission lines create electromagnetic fields that directly heat the hydrocarbon-bearing strata, eliminating the need for hydraulic fracturing fluids. This substitution transforms the extraction mechanism from mechanical pressure-based to electromagnetic energy-based, resolving the contradiction between recovery efficiency and water consumption.
Solution Approach 2:
The patent changes the physical parameters of the extraction process by using RF heating to increase the temperature of the strata. This temperature increase alters the permeability and enables pyrolysis of kerogen, creating a new extraction pathway that does not rely on water injection. The parameter change from ambient temperature to elevated temperature resolves the water consumption issue while maintaining productivity.
2Productivity
If traditional heating methods are used to increase permeability, then oil extraction is improved, but energy consumption increases
Solution Approach 1:
The patent substitutes conventional thermal conduction heating with direct RF electromagnetic heating. The RF transmission lines deliver energy directly to the target strata through electromagnetic coupling, eliminating the need for physical heat sources and thermal conduction media. This direct energy transfer reduces energy losses and improves extraction efficiency while lowering overall energy consumption.
Solution Approach 2:
The patent introduces RF transmission lines as an intermediary medium to transfer electromagnetic energy from the surface to the subsurface strata. This intermediary enables efficient energy transfer through the well pipe structure, acting as a waveguide that directs energy precisely to the target zone, thereby reducing energy dispersion and consumption compared to traditional surface heating methods.
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 effectively increases oil and gas recovery from low permeability strata with reduced water consumption, achieving higher yields per volume compared to traditional methods and minimizing environmental impact.
Implementation Method 1
heating the hydrocarbon bearing strata... by employing RF transmission lines
Implementation Method 2
The passage of the current through the hydrocarbon bearing strata results in resistive Joule heating
Implementation Method 3
A system utilizing a three-dimensional underground electromagnetic array to guide RF energy... by employing RF transmission lines and well pipe segments to create a guided wave structure
Implementation Method 4
inducing pyrolysis... converts kerogen in hydrocarbon bearing strata into oil by pyrolysis
Data Source
AI summary
A system and method are provided that use RF energy to enhance the extraction of oil and gas from hydrocarbon bearing strata. A three-dimensional underground electromagnetic array of coupled well pipe segments is used to guide RF energy to where that energy is converted to heat in the hydrocarbon bearing strata. The three dimensional underground electromagnetic array of coupled well pipe segments includes a switch to selectively activate coupled well pipe segments and is a guided wave structure, as opposed to an antenna structure, to minimize the unwanted effects of the near fields associated with antennas. In one embodiment, the leas of the three-dimensional underground electromagnetic array are composed of production well pipe.