RF Applicator Positioning for Selective Tar Sand Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydrocarbon resource recovery methods, such as Steam-Assisted Gravity Drainage (SAGD), face inefficiencies due to high energy and water consumption, significant heat loss, and limited applicability in permafrost regions, with long production times and high abandonment rates of failed start-ups, especially in extracting viscous hydrocarbons from tar sands.
Innovation Solution
The method involves forming spaced apart injector/producer well pairs with an intermediate RF applicator positioned to selectively apply RF energy to specific areas of the subterranean formation, improving permeability and facilitating hydrocarbon recovery by reducing viscosity and enhancing hydraulic communication, thereby reducing energy and water usage and accelerating the recovery process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SAGD method is used to extract viscous hydrocarbons from tar sands, then hydrocarbon recovery is achieved, but energy consumption is high and production time is long
Solution Approach 1:
The invention divides the heating process into segments by using multiple RF applicators positioned at different depths within the wellbore, each independently heating specific zones. This segmented approach allows targeted energy application to where it is most needed, reducing overall energy consumption compared to conventional SAGD which heats the entire formation uniformly.
Solution Approach 2:
The RF applicators are positioned to provide localized heating at specific depths within the tar sand formation. Each applicator targets a specific zone with electromagnetic energy, creating local heating zones that reduce viscosity and improve flow properties only where required, rather than heating the entire formation as in conventional SAGD.
2Productivity
If SAGD method is used for hydrocarbon recovery, then oil production is achieved, but water consumption is significant
Solution Approach 1:
The invention replaces the mechanical/thermal system of steam injection with an electromagnetic field-based RF heating system. RF applicators transmit electromagnetic energy directly to the hydrocarbons and formation, heating them without requiring large volumes of water/steam as in conventional SAGD, thereby dramatically reducing water consumption.
3Productivity
If conventional RF heating is applied to the entire wellbore, then hydrocarbon viscosity is reduced, but energy consumption increases
Solution Approach 1:
Multiple RF applicators are positioned at different depths within the wellbore, each responsible for heating a specific zone. This segmentation allows the system to apply RF energy only where hydrocarbons are present and need heating, rather than heating the entire wellbore length, thereby reducing overall energy consumption while maintaining effective viscosity reduction in target zones.
Solution Approach 2:
Each RF applicator is positioned to provide localized heating at specific depths where hydrocarbon accumulation is detected or expected. The electromagnetic energy is concentrated in specific zones to reduce viscosity and improve flow properties locally, rather than applying energy uniformly along the entire wellbore.
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 more efficient hydrocarbon resource recovery with reduced energy and water consumption, faster recovery rates, and improved operational efficiency, including the ability to repair failed wells, thus overcoming the limitations of traditional SAGD methods.
Implementation Method 1
supplying RF energy to the RF applicator to selectively heat portions of the subterranean formation
Implementation Method 2
operating a positioning actuator to position the RF applicator coupled to the positioning actuator to a predetermined location within the intermediate well
Implementation Method 3
Oil and water flow is by gravity driven drainage, into the lower producer well
Implementation Method 4
The injected steam forms a steam chamber that expands vertically and horizontally in the formation
Data Source
AI summary
A method of hydrocarbon resource recovery from a subterranean formation may include forming a plurality of spaced apart injector/producer well pairs in the subterranean formation. Each injector/producer well pair may include a laterally extending producer well and a laterally extending injector well spaced thereabove. The method may include forming an intermediate well adjacent a given injector/producer well pair, and operating a positioning actuator to position a radio frequency (RF) applicator coupled to the positioning actuator to at least one predetermined location within the intermediate well. The method may further include supplying RF energy to the RF applicator at the at least one predetermined location within the intermediate well to selectively heat at least one corresponding portion of the subterranean formation adjacent the given injector/producer well pair. The method may also include recovering hydrocarbon resources from the plurality of injector/producer well pairs including the given injector/producer well pair.