Multicomponent Nanocapsules for Surfactant Protection in Oil Recovery
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Solution Overview
Problem
Existing enhanced oil recovery (EOR) techniques face challenges in delivering surfactants efficiently to hydrocarbon reserves due to degradation under harsh reservoir conditions and near-wellbore adsorption, necessitating high surfactant usage and limited penetration into the formation.
Innovation Solution
A multicomponent nanocapsule (MCNC) composition is developed, comprising a core particle with a cationic surfactant encapsulated in a porous particle, surrounded by an oil phase with an anionic and zwitterionic surfactant, and suspended in an aqueous phase, providing stability and controlled surfactant release under high temperature and salinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional surfactant injection techniques are used to lower interfacial tension between residual hydrocarbon and injection fluid, then hydrocarbon removal is improved, but surfactant degradation under harsh reservoir conditions and near-wellbore adsorption worsen, requiring tremendous amounts of surfactant
Solution Approach 1:
The patent employs a nested capsule structure where an inner core containing surfactant is encapsulated within an outer shell. This nested configuration protects the surfactant from degradation and adsorption losses while enabling controlled release, thereby reducing the total surfactant quantity needed for effective EOR operations
Solution Approach 2:
The capsule shell acts as an intermediary between the surfactant and the harsh reservoir environment. This intermediate layer shields the surfactant from direct contact with degrading conditions and formation surfaces that cause adsorption, allowing the surfactant to reach the hydrocarbon target more efficiently
2Measurement precision
If magnetic materials are used to probe reservoir structure for improved EOR operations, then imaging capability is improved, but stability of magnetic materials and surfactants under high temperature and high salinity conditions worsens
Solution Approach 1:
The patent utilizes composite capsule structures combining magnetic materials with surfactant-loaded cores. The composite design integrates the imaging capability of magnetic materials with the protective and controlled-release properties of the capsule shell, maintaining stability under high temperature and salinity while enabling reservoir characterization
Solution Approach 2:
The capsule shell composition is specifically designed to remain stable under high temperature and high salinity conditions. By selecting materials with appropriate thermal and salinity resistance parameters, the capsule maintains its structural integrity and protective function in harsh reservoir environments where conventional materials would degrade
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 MCNC composition maintains stability and effectively displaces hydrocarbons, enhancing oil recovery by ensuring deeper penetration and reducing surfactant loss, thus improving recovery efficiency.
Implementation Method 1
The porous particle includes a cationic surfactant encapsulated in a porous particle
Implementation Method 2
The oil phase includes an anionic surfactant and a zwitterionic surfactant
Data Source
AI summary
A multicomponent nanocapsule composition comprising a core particle, an oil phase encapsulating the core particle, and an aqueous phase in which the encapsulated core particle is suspended is provided. The porous particle includes a cationic surfactant encapsulated in a porous particle. The oil phase includes an anionic surfactant and a zwitterionic surfactant. A method of making a multicomponent nanocapsule composition is also provided. A method of treating a hydrocarbon-bearing formation with the multicomponent nanocapsule composition is provided. The method may include providing a multicomponent nanocapsule composition, introducing the multicomponent nanocapsule composition into the hydrocarbon-bearing formation, displacing hydrocarbons from the hydrocarbon-bearing formation by contacting the multicomponent nanocapsule composition with the hydrocarbons, and recovering the hydrocarbons.