RF Absorbent Liner for In Situ Bitumen Upgrading
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Solution Overview
Problem
Current methods for in situ upgrading of hydrocarbons such as oil shale and tar sands face inefficiencies due to high energy requirements, non-uniform heating, and environmental concerns, particularly in achieving large-scale commercial application, as existing techniques like electrical heating and electrothermic processes struggle with heat conduction and waste management.
Innovation Solution
The use of radio frequency (RF) absorbent materials, heated by an RF emitter, to upgrade hydrocarbons in situ by inducing heat through electromagnetic energy, which efficiently transfers heat to the surrounding hydrocarbons, thereby enhancing porosity and mobility for hydrocarbon recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrical heating elements are imbedded in pipes and inserted in boreholes to heat oil shale, then the hydrocarbons can be upgraded through pyrolysis, but the pipes must be heated to considerably higher temperatures than required for pyrolysis, wasting input electrical energy and potentially carbonizing organic matter
Solution Approach 1:
The patent introduces a borehole liner as an intermediary material between the heating source and the oil shale. This liner has controlled thermal conductivity to facilitate efficient heat transfer to the surrounding hydrocarbons, eliminating the need for excessive heating temperatures and reducing energy waste while preventing carbonization of organic matter.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the borehole liner to optimize heat transfer. By selecting materials with specific thermal conductivity values, the system achieves uniform and efficient heating of hydrocarbons at lower temperatures, avoiding the energy waste and carbonization problems associated with conventional direct heating methods.
2Productivity
If electrical heating elements are used to heat oil shale, then pyrolysis can be achieved, but overheating of oil shale is inefficient and may carbonize organic matter, limiting the yield
Solution Approach 1:
The borehole liner acts as a thermal mediator that controls and distributes heat uniformly to the surrounding oil shale, preventing localized overheating and carbonization. This intermediary layer ensures that heat is transferred efficiently and uniformly, maximizing hydrocarbon yield while preventing harmful carbonization effects.
Solution Approach 2:
The patent applies the concept of local quality by ensuring uniform heat distribution throughout the oil shale formation surrounding the borehole. The liner's thermal properties are designed to create consistent temperature gradients, preventing localized hot spots that would cause carbonization and preserving the quality and yield of hydrocarbon products.
3Use of energy by stationary object
If ohmic ground heating is used to heat tar sands, then electrical current can be carried between electrodes, but the formations are generally not sufficiently conductive to facilitate efficient uniform heating
Solution Approach 1:
The conductive borehole liner serves as an intermediary that bridges the conductivity gap between the electrical heating elements and the tar sands formation. The liner's controlled electrical conductivity allows efficient current flow and heat generation at the borehole wall, while its thermal conductivity ensures uniform heat distribution to the surrounding formation, overcoming the naturally low conductivity of tar sands.
4Quantity of substance
If conventional heat processing is used to separate bitumen from sand, then bitumen can be recovered, but the volume of material to be handled is relatively large and material handling is particularly difficult
Solution Approach 1:
The patent extracts the bitumen upgrading process from the bulk material handling operation by performing in-situ upgrading directly within the borehole. The borehole liner enables heat treatment and separation to occur in place, eliminating the need to handle and transport large volumes of bitumen-sand mixture, thereby simplifying material handling while maintaining recovery efficiency.
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 provides a cost-effective and efficient means of upgrading hydrocarbons in situ, reducing energy waste and environmental impact by achieving uniform heating and maximizing hydrocarbon yield, while minimizing hardware degradation and operational costs.
Implementation Method 1
A radio frequency (RF) emitter generates an electromagnetic field that induces an RF current in a RF absorbent material disposed at or near the production wellbore. The RF current heats the RF absorbent material.
Implementation Method 2
The heated RF absorbent material is used to heat the hydrocarbons in situ surrounding the production wellbore.
Data Source
AI summary
The present invention provides a method of producing upgraded hydrocarbons in-situ from a production well. The method begins by operating a subsurface recovery of hydrocarbons with a production well. An RF absorbent material is heated by at least one RF emitter and used as a heated RF absorbent material, which in turn heats the hydrocarbons to be produced. Hydrocarbons are upgraded in-situ and then produced from the production well.