In-situ Heavy Oil Upgrading via Microwave Activator and Catalyst
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Solution Overview
Problem
Current methods for in-situ upgrading of heavy crude oil using radio frequency or microwave radiation are inefficient due to the challenge of selecting appropriate frequencies and limited area coverage, and do not effectively direct radiation into production wells for pre-refinery upgrading.
Innovation Solution
A method involving the injection of activators with specific properties into production wells, excited by microwave frequencies to heat the heavy oil, combined with a catalyst for hydrogenation or desulfurization, allowing for targeted and efficient upgrading of heavy oil within the wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio frequency or microwave radiation is used to heat heavy crude oil in-situ, then the viscosity reduction and heating efficiency are improved, but the difficulty in selecting appropriate frequency and limited area coverage worsen
Solution Approach 1:
The patent introduces an activator substance as an intermediary that absorbs microwave radiation and converts it to heat. This mediator solves the frequency selection problem by allowing the use of a fixed, common microwave frequency (2.45 GHz) while the activator's molecular structure determines the actual heating effectiveness, eliminating the need to match frequencies to specific hydrocarbon components.
Solution Approach 2:
The invention changes the approach from varying microwave frequency parameters to varying the chemical composition parameters of the activator. By selecting activators with specific dipole moments and molecular structures, the system achieves frequency-independent heating while maintaining high productivity.
2Productivity
If radio frequency is directed into production well for upgrading heavy oil, then the pre-refinery upgrading capability is improved, but the method complexity and implementation difficulty worsen
Solution Approach 1:
The patent applies preliminary action by injecting the activator into the heavy oil before applying microwave radiation. This pre-positioning of the energy-absorbing substance simplifies the subsequent heating process, as the activator is already in place to convert microwave energy to heat throughout the oil column, making the operation straightforward and repeatable.
Solution Approach 2:
The activator serves as a mediator that simplifies the interaction between microwave radiation and heavy oil. Instead of directly attempting to heat the oil through complex frequency matching, the activator mediates the energy transfer, absorbing microwaves and converting them to thermal energy, thereby simplifying the overall process implementation.
3Use of energy by moving object
If microwave radiation is used alone to break carbon-carbon bonds, then the energy requirement is reduced, but the bond breaking effectiveness worsens
Solution Approach 1:
The patent merges two mechanisms: microwave heating and catalytic cracking. The microwave radiation provides thermal energy to lower the activation energy barrier, while the catalyst (zeolite or other cracking catalyst) provides the chemical pathway for efficient bond breaking. This combination achieves both low energy requirement and high bond breaking effectiveness.
Solution Approach 2:
The system uses a composite approach combining physical (microwave radiation) and chemical (catalyst) upgrading mechanisms. The activator and catalyst work together in a synergistic manner, where the activator enables microwave absorption and the catalyst enables efficient cracking, creating a composite upgrading system that overcomes the limitations of either method alone.
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 efficient heating and upgrading of heavy oil in-situ, reducing viscosity and potentially decreasing startup time and greenhouse gas emissions, while allowing for precise frequency selection and broader area coverage.
Implementation Method 1
The activator is then excited with a generated microwave frequency such that the excited activator heats the heavy oil
Implementation Method 2
The activator is then excited with a generated microwave frequency such that the excited activator heats the heavy oil
Implementation Method 3
A catalyst is then injected below the surface such that the catalyst contacts the heated heavy oil thereby producing an upgraded heavy oil
Data Source
AI summary
A method for heating heavy oil inside a production well. The method raises the subsurface temperature of heavy oil by utilizing an activator that has been injected below the surface. The activator is then excited with a generated microwave frequency such that the excited activator heats the heavy oil.