Multi-function agent for bitumen recovery
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Solution Overview
Problem
Current hydrocarbon recovery methods from bituminous sands face challenges due to high viscosities of hydrocarbons and compatibility issues with chemical additives at elevated temperatures and pressures, particularly with surfactants and solvents in steam-assisted processes like SAGD.
Innovation Solution
Incorporating a multi-function agent comprising an organic molecule that reduces the viscosity of oil and interfacial tension between oil and water or rock, with a partition coefficient favoring solubility in oil, to enhance hydrocarbon mobility and recovery by co-injecting it with steam into the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam is injected to heat the reservoir and reduce bitumen viscosity, then the mobility of bitumen is improved, but the energy consumption and operational complexity increase due to high temperatures and pressures required
Solution Approach 1:
The patent changes the chemical parameters of the injection fluid by adding surfactants and solvents to steam, creating a multi-component fluid that achieves better recovery at lower effective temperatures. The surfactant concentration and solvent type are adjusted to optimize the balance between viscosity reduction and energy consumption.
Solution Approach 2:
The invention uses a composite injection fluid comprising steam, surfactant, and solvent components. This composite approach combines the thermal effects of steam with the chemical effects of surfactants (for interfacial tension reduction) and solvents (for viscosity reduction), achieving enhanced recovery without proportionally increasing energy input.
2Productivity
If chemical additives such as surfactants are used to reduce interfacial tension and enhance drainage, then the flow rate of hydrocarbons is improved, but compatibility issues and thermal stability problems occur at elevated temperatures and pressures
Solution Approach 1:
The patent selects surfactants with specific molecular structures and critical micelle concentrations that remain stable at reservoir temperatures. The surfactant chain length, hydrophilic-lipophilic balance, and concentration are optimized to maintain effectiveness and stability under high-temperature steam injection conditions.
Solution Approach 2:
The invention introduces solvent components as intermediaries that protect the surfactant molecules from thermal degradation. The solvent acts as a buffer medium that maintains the surfactant's structural integrity and functional performance at elevated temperatures and pressures throughout the reservoir.
3Speed
If organic solvents are used to dilute softened bitumen and increase mobility, then the drainage rate to production well is improved, but the complexity of the injection system and chemical compatibility requirements increase
Solution Approach 1:
The patent selects organic solvents that serve multiple functions simultaneously: they dilute the bitumen to reduce viscosity, enhance the solubility of surfactants at high temperatures, and maintain chemical compatibility with reservoir minerals and fluids. This multi-functionality reduces the need for separate additive systems and simplifies the overall injection process.
Solution Approach 2:
The invention optimizes the solvent-to-bitumen ratio and solvent molecular weight to achieve the desired drainage rate while maintaining system simplicity. The solvent concentration is adjusted to provide sufficient dilution effect without creating excessive foam or requiring complex injection infrastructure.
4Productivity
If high concentrations of chemical additives are used to overcome compatibility issues, then the effectiveness of viscosity reduction is improved, but the cost and environmental impact increase
Solution Approach 1:
The patent optimizes the concentration of each chemical component (surfactant and solvent) to achieve minimum effective levels that provide sufficient viscosity reduction and interfacial tension reduction. The concentrations are adjusted based on reservoir temperature, pressure, and bitumen composition to minimize chemical usage while maintaining recovery effectiveness.
Solution Approach 2:
The invention creates a synergistic composite system where surfactant and solvent components work together at lower individual concentrations than would be required if used separately. The combined effect of interfacial tension reduction by surfactant and viscosity dilution by solvent achieves enhanced recovery with reduced total chemical dosage.
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 multi-function agent increases the flow rate and drainage rate of hydrocarbons, reduces residual oil saturation, and improves overall hydrocarbon recovery efficiency by forming oil-in-water emulsions and reducing capillary resistance, thereby enhancing oil production rates and reducing steam usage.
Implementation Method 1
an organic molecule that reduces viscosity of oil and the interfacial tension between oil and at least one of water, gas or rock in the reservoir, and has a partition coefficient favouring solubility in oil over water
Implementation Method 2
the organic molecule that reduces viscosity of oil and the interfacial tension between oil and at least one of water, gas or rock in the reservoir
Implementation Method 3
a partial pressure in the reservoir allowing the organic molecule to be transported with steam as a vapour
Implementation Method 4
improves overall hydrocarbon recovery efficiency by forming oil-in-water emulsions
Implementation Method 5
steam-assisted gravity drainage (SAGD) is an example of an in situ (or in-situ) steam injection-based hydrocarbon recovery process used to extract heavy oil or bitumen from a reservoir of bituminous sands by reducing viscosity of the hydrocarbons via steam injection
Implementation Method 6
The softened bitumen and condensed steam can flow and drain downward due to gravity
Data Source
AI summary
For hydrocarbon recovery from a reservoir of bituminous sands, steam and a multi-function agent are injected into the reservoir for mobilizing bitumen in the reservoir to form a fluid comprising hydrocarbons, water and the multi-function agent. The fluid is produced from the reservoir. The multi-function agent may comprise an organic molecule that reduces viscosity of oil and the interfacial tension between oil and water or a gas or rock in the reservoir, and has a partition coefficient favoring solubility in oil over water and a partial pressure in the reservoir allowing the organic molecule to be transported with steam as a vapor. The multi-function agent may comprise a solvent for reducing viscosity of oil and a surfactant for reducing interfacial tension, where both the solvent and surfactant are transportable with steam as vapor.