Aromatic Additives for SAGD Bitumen Viscosity Reduction
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Solution Overview
Problem
Current steam-assisted gravity drainage (SAGD) methods for hydrocarbon recovery are energy-intensive, require significant fresh water, and have limited production rates due to high viscosity of bitumen, with existing additives often causing stable emulsions that hinder recovery.
Innovation Solution
Incorporating aromatic hydrocarbons, such as methyl salicylate or phenyl acetate, into the steam or water used in SAGD processes to reduce viscosity and improve heat efficiency, allowing for increased bitumen recovery without interfering with the emulsion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam is used to reduce hydrocarbon viscosity in SAGD processes, then hydrocarbon flow is enabled, but energy consumption increases and production rates remain limited
Solution Approach 1:
The patent introduces aromatic hydrocarbons as intermediary substances that facilitate the interaction between steam and bitumen. These aromatic hydrocarbons act as mediators that enhance heat transfer efficiency and reduce the steam-to-bitumen ratio required for effective viscosity reduction, thereby improving productivity while reducing energy consumption
Solution Approach 2:
The patent modifies the chemical composition parameters of the steam injection system by adding aromatic hydrocarbons. This parameter change alters the physical and chemical properties of the injected fluid, enabling more efficient heat transfer and reduced steam requirements, thus resolving the contradiction between productivity and energy consumption
2Productivity
If existing additives are added to SAGD processes to improve bitumen recovery, then some recovery enhancement is achieved, but stable emulsions form that hinder recovery
Solution Approach 1:
The patent changes the chemical parameters of the additives by selecting specific aromatic hydrocarbons with particular molecular structures and properties. These parameter changes in the additive chemistry allow for improved bitumen recovery while avoiding the formation of stable emulsions, as the selected aromatic hydrocarbons do not create the same emulsion stability issues as conventional additives
Solution Approach 2:
The patent employs aromatic hydrocarbons that can be easily introduced and degraded or separated from the system. These additives serve their function temporarily during the recovery process and do not persist to form stable emulsions, effectively acting as disposable substances that provide temporary benefit without long-term harmful effects
3Productivity
If high viscosity bitumen is processed through gravity drainage, then some recovery is achieved, but production rates are limited by the high viscosity
Solution Approach 1:
The patent introduces aromatic hydrocarbons as intermediary substances that mediate between the steam and bitumen. These intermediaries facilitate more efficient heat transfer and chemical interaction, enabling faster viscosity reduction and improved production rates while maintaining manageable bitumen composition stability
Solution Approach 2:
The patent enables continuous and more effective heat transfer action through the aromatic hydrocarbon medium. The aromatic hydrocarbons maintain continuous contact between steam and bitumen, ensuring sustained viscosity reduction and improved production rates without interruption or loss of effectiveness
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 use of aromatic hydrocarbons enhances bitumen extraction, reduces the steam-to-oil ratio, and allows for optimal recovery levels by improving heat efficiency and preventing stable emulsions, thereby increasing the amount of bitumen produced for the same steam input.
Implementation Method 1
steam injection for a period of weeks to months to heat the hydrocarbon, bitumen or heavy oil resource in the reservoir, thereby reducing its viscosity such that it will be able to flow
Implementation Method 2
heat the hydrocarbon, bitumen or heavy oil resource in the reservoir, thereby reducing its viscosity such that it will be able to flow
Implementation Method 3
the steam condenses and a hydrocarbon-in-water emulsion forms allowing the hydrocarbon to travel more readily to the producing well
Implementation Method 4
contacting the hydrocarbon with one or more aromatic hydrocarbons... reducing the viscosity of the bitumen
Implementation Method 5
improving heat efficiency... increasing the amount of bitumen produced for the same steam input
Implementation Method 6
the hydrocarbons or bitumen are now able to enter the production well... drain along the edge of the steam chamber under the influence of gravity to the lower producing well
Data Source
AI summary
A hydrocarbon from a subterranean formation can be recovered by contacting the hydrocarbon with water or steam and one or more additives. The hydrocarbon can be selected from heavy or light crude oil, bitumen, an oil sand ore, a tar sand ore, and combinations thereof. The additive can be, for example, an aromatic hydrocarbon. The water or steam and the additive can be injected into the subterranean formation. Compositions or mixtures include hydrocarbons, water or steam, and additives.