Multi-purpose Ester Agent for Heavy Oil Viscosity Reduction
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Solution Overview
Problem
Steam-based heavy oil recovery processes face inefficiencies due to high interfacial tension between water and heavy oil, which hinders the flow of heavy oil to production wells, and existing diluting agents lack sufficient heat transfer and solubility parameters to effectively reduce viscosity.
Innovation Solution
Incorporating a multi-purpose agent, specifically esters like n-propyl acetate, which reduces interfacial tension and possesses high latent heat of condensation, is injected with steam to enhance heavy oil recovery by reducing viscosity and improving fluid communication between wellbores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam is injected to heat heavy oil, then viscosity of heavy oil is reduced, but interfacial tension between water and heavy oil remains high, hindering flow
Solution Approach 1:
A multi-purpose agent is introduced as an intermediary substance between steam and heavy oil. This agent has dual functionality: it acts as a surfactant to reduce interfacial tension between water and heavy oil, and simultaneously serves as a diluent to further reduce viscosity. The agent is injected with steam into the reservoir, where it mediates the interaction between the aqueous phase and heavy oil, enabling more effective displacement and flow.
Solution Approach 2:
The injection fluid is formulated as a composite mixture combining steam, water, and a multi-purpose chemical agent. This composite injection fluid integrates the thermal effects of steam with the surface-active and diluting properties of the chemical agent, creating a synergistic system that addresses both viscosity reduction and interfacial tension reduction simultaneously.
2Ease of manufacture
If conventional diluting agents are used, then viscosity is reduced, but heat transfer capability and solubility parameters are insufficient
Solution Approach 1:
The multi-purpose agent is designed to perform multiple functions simultaneously: it acts as a diluent to reduce viscosity, as a surfactant to reduce interfacial tension, and as a heat transfer enhancement agent. This universal agent replaces the need for separate conventional diluting agents, steam generation systems, and heat transfer additives, providing integrated functionality that improves overall process efficiency.
3Temperature
If steam injection continues, then heavy oil is heated, but start-up phase is prolonged and production is delayed
Solution Approach 1:
The multi-purpose agent is injected concurrently with steam during the start-up phase to preliminarily reduce viscosity and improve fluidity before significant heating occurs. This preliminary action of viscosity reduction through dilution and surfactant effects allows heavier oil to flow more readily during the critical early stages, shortening the time required to achieve economic production rates without waiting for complete thermal equilibration.
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-purpose agent significantly reduces heavy oil viscosity, enhances production rates, and accelerates the start-up phase of steam-assisted gravity drainage processes, allowing for more efficient heavy oil extraction by improving heat transfer and penetration into the reservoir.
Implementation Method 1
Incorporating a multi-purpose agent, specifically esters like n-propyl acetate, which reduces interfacial tension
Implementation Method 2
possesses high latent heat of condensation
Implementation Method 3
enhance heavy oil recovery by reducing viscosity and improving fluid communication
Data Source
AI summary
A method of recovering heavy oil from a subterranean reservoir. The method includes injecting steam into a subterranean reservoir to heat heavy oil in the subterranean reservoir and thereby produce heavy oil of reduced viscosity; injecting a multi-purpose agent into the subterranean reservoir; and producing the heavy oil of reduced viscosity from the subterranean reservoir after injecting the steam and the multi-purpose agent. The multi-purpose agent comprises an ester of the formula RxCOORy wherein Rx is a straight chained or branched alkyl group having 1 to 8 carbon atoms, Ry is a straight chained or branched alkyl group having 1 to 12 carbon atoms, C is carbon and O is oxygen.