Polymeric Surfactants for Enhanced Oil Recovery Salt Tolerance
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Solution Overview
Problem
Existing surfactants used in enhanced oil recovery (EOR) processes exhibit low stability in highly saline media and limited colloidal stability, requiring high concentrations and complex synthesis methods, which restricts their industrial application.
Innovation Solution
Development of polymeric surfactants with a molecular weight range of 20 kDa to 120 kDa, comprising strategically combined non-ionic and ionic monomers, which provide stability across a wide salt concentration and temperature range, using methods like Atom Transfer Radical Polymerization (ATRP) and Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional surfactants are used in enhanced oil recovery, then they can disperse oily phases in aqueous systems, but they exhibit low stability in highly saline media and have limited colloidal stability
Solution Approach 1:
The invention changes the molecular parameters of surfactants by using polymeric structures with specific molecular weights (20-120 kDa) and controlled architectures (block, graft, star, comb) to achieve both high salt tolerance and broad adaptability across different salt concentrations
Solution Approach 2:
The invention creates composite polymeric surfactant molecules combining hydrophobic segments (for oil interaction) and hydrophilic segments (for water solubility and salt tolerance), where the synergistic interaction between different molecular components achieves both stability and versatility in saline environments
2Quantity of substance
If low molecular weight surfactants are used, then they allow dispersion of oily phases in aqueous systems, but considerable amounts of surfactant are required and colloidal stability is limited
Solution Approach 1:
The invention segments the surfactant molecule into distinct functional domains (hydrophobic blocks and hydrophilic blocks) within a polymeric chain, allowing the molecule to simultaneously interact with both oil and water phases while maintaining colloidal stability at lower concentrations
Solution Approach 2:
The invention transitions from low molecular weight surfactants to high molecular weight polymeric surfactants, adding the dimension of molecular weight and chain architecture control to achieve enhanced colloidal stability and reduced surfactant dosage requirements
3Reliability
If polymeric surfactants with high salt tolerance are formulated, then they can tolerate high salt concentrations, but a small deviation from those concentrations causes the system to quickly destabilize
Solution Approach 1:
The invention creates dynamically adaptable polymeric surfactant systems where the polymer chains can adjust their conformation and micellar structure in response to varying salt concentrations, maintaining stability across a broad range rather than at a fixed point
4Ease of manufacture
If complex synthetic methods are employed for preparation of polymeric surfactants, then polymeric surfactants can be prepared, but several steps and complex experimental techniques are required which limits industrial synthesis
Solution Approach 1:
The invention merges multiple synthesis steps into unified polymerization processes (such as one-pot synthesis of block copolymers), reducing the number of separate operations and simplifying the overall manufacturing process for industrial application
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 polymeric surfactants demonstrate increased stability and efficiency in high salinity conditions, achieving ultra-low oil/water interfacial tensions and higher recovery factors, with a stable performance from room temperature to 95°C, enhancing the effectiveness of oil recovery processes.
Implementation Method 1
The non-ionic entities, both hydrophobic and hydrophilic confer the surfactant its surface activity
Implementation Method 2
the ionic entities provide stability in a wide range of salt concentrations
Data Source
AI summary
A polymeric surfactant for use in chemical enhanced oil recovery, including a terpolymer of a first non-ionic monomer, a second non-ionic monomer, and an ionic monomer, the first non-ionic monomer being a hydrophilic monomer and the second non-ionic monomer being a hydrophobic monomer, the ionic monomer being in a lower proportion than the first and second non-ionic monomers. A method of preparation of polymeric surfactants.