RF Radiator Dielectric Layer for Wellbore Conductive Loss Reduction
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Solution Overview
Problem
Current hydrocarbon resource recovery methods, such as RF heating, face inefficiencies in startup and energy penetration due to conductive losses in uninsulated wellbores, particularly in hydrocarbon-rich formations with high moisture content.
Innovation Solution
A method involving the formation of a radio frequency (RF) radiator in a laterally extending wellbore by positioning an electrically conductive member and solidifying a dielectric material, such as alkali metal silicate, over it using direct current power to reduce conductive losses and enhance insulation, allowing for more efficient RF energy penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RF heating is applied to hydrocarbon resources in uninsulated wellbores, then heating effect is achieved, but conductive losses increase and startup efficiency decreases
Solution Approach 1:
The patent introduces a dielectric material as an intermediary substance between the conductive member and the hydrocarbon formation. This dielectric material serves as a mediator that prevents direct conductive contact, thereby reducing conductive losses while allowing RF energy to effectively heat the formation through the dielectric barrier.
Solution Approach 2:
The patent applies a dielectric coating or lining (thin film) on the conductive member or wellbore wall. This thin dielectric film acts as an insulating layer that reduces conductive heat losses from the wellbore while permitting RF energy penetration to heat the hydrocarbon formation, thereby improving startup efficiency and energy utilization.
2Loss of energy
If wellbores are insulated to reduce conductive losses, then energy efficiency improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the electrical parameter (conductivity) of the wellbore environment by introducing dielectric material. This parameter change transforms the wellbore from a conductive state to a dielectric state, reducing conductive losses without requiring complex mechanical insulation structures, thereby simplifying the overall system while improving energy efficiency.
3Productivity
If startup time is reduced for RF heating, then productivity increases, but energy losses during startup increase
Solution Approach 1:
The patent applies dielectric material to the wellbore or conductive member before initiating RF heating operations. This preliminary action of insulating the wellbore prevents conductive losses during the startup phase, allowing RF energy to be efficiently transferred to the formation from the beginning, thereby reducing overall startup time and energy losses simultaneously.
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 method increases the efficiency of hydrocarbon resource recovery by reducing startup costs and time, improving RF energy penetration, and stabilizing the wellbore, leading to increased hydrocarbon extraction efficiency and reduced energy losses.
Implementation Method 1
solidifying the solidifiable material to form a dielectric material layer over the at least one electrically conductive member to form the RF radiator
Implementation Method 2
RF heating energy may instantaneously penetrate many feet
Data Source
AI summary
A method for forming a radio frequency (RF) radiator in a laterally extending wellbore in a subterranean formation containing a hydrocarbon resource may include positioning at least one electrically conductive member within the laterally extending wellbore. The method may also include supplying a solidifiable material adjacent the at least one electrically conductive member, and solidifying the solidifiable material to form a dielectric material layer over the at least one electrically conductive member to form the RF radiator.