Cationic Carbohydrate Ether Surfactants for High-Temperature Stability
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Solution Overview
Problem
Conventional viscoelastic surfactants used in hydrocarbon recovery face limitations such as temperature restrictions, high production costs, environmental toxicity, poor solubility in high salt solutions, and instability in acidic conditions, which hinder their effectiveness and sustainability in well stimulation processes.
Innovation Solution
Cationic carbohydrate ethers (CCEs) are developed, comprising cationic fragments, carbohydrate fragments, and linker fragments connected through ether bonds, offering improved viscoelastic properties, increased solubility in high salt solutions, and enhanced stability at elevated temperatures, while being more environmentally friendly and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional viscoelastic surfactants are used in hydrocarbon recovery, then they can provide viscosity enhancement and well stimulation, but they face temperature restrictions and instability in acidic conditions
Solution Approach 1:
The patent changes the chemical parameters of the surfactant by using cationic carbohydrate ethers with quaternary ammonium groups and ether linkages instead of conventional glycosidic bonds. This chemical parameter change enables the surfactant to maintain stability at higher temperatures and in acidic conditions while retaining viscoelastic properties
Solution Approach 2:
The patent creates a composite molecular structure combining carbohydrate fragments with cationic quaternary ammonium groups through ether linkages. This composite structure integrates the beneficial properties of both components: the thermal and acid stability of ether bonds and the viscoelastic capabilities of carbohydrate-based surfactants
2Reliability
If conventional viscoelastic surfactants are used, then they can achieve desired rheological properties, but they have high production costs
Solution Approach 1:
The patent changes the manufacturing parameters by using readily available carbohydrate feedstocks and standard etherification chemistry with quaternary ammonium compounds. This approach significantly reduces production costs compared to conventional surfactants while maintaining effective rheological performance through the viscoelastic properties of the carbohydrate ether structure
3Reliability
If conventional surfactants are used, then they can provide viscosity control, but they have environmental toxicity and poor biodegradability
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional hydrocarbon-based surfactants with carbohydrate-derived cationic ethers. This parameter change maintains the necessary viscosity control and viscoelastic properties while improving environmental compatibility through the biodegradability and lower toxicity of carbohydrate structures
Solution Approach 2:
The patent enables easier discarding of the surfactant after use because the carbohydrate-based cationic ethers are more biodegradable and environmentally friendly. The natural carbohydrate structure allows for biological degradation, reducing environmental persistence and toxicity concerns associated with conventional surfactants
4Stability of the object's composition
If conventional surfactants are used, then they can form gel structures, but they have poor solubility in high salt solutions
Solution Approach 1:
The patent changes the molecular parameter by introducing quaternary ammonium groups with appropriate counterions to the carbohydrate ether structure. This parameter change enhances solubility in high salt solutions through ion-dipole interactions and electrostatic effects, while the ether-linked carbohydrate structure maintains gel formation capabilities through hydrophobic interactions and hydrogen bonding
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
CCEs provide stable viscoelastic solutions at higher temperatures and salt concentrations, reducing formation damage and environmental impact, with improved solubility and biodegradability, thus enhancing the efficiency and sustainability of well stimulation processes.
Implementation Method 1
impart one or more distinctive and useful rheological properties to aqueous solutions... viscoelasticity, increased viscosity, shear thinning
Implementation Method 2
The useful Theological properties provided by one or more preferred compositions of the present technology include, for example, viscoelasticity, increased viscosity, shear thinning
Implementation Method 3
carbohydrate fragments are connected to linker fragments through ether groups... enhanced stability at elevated temperatures... instability in acidic conditions
Data Source
AI summary
A viscoelastic composition containing an effective amount of at least one cationic carbohydrate ether having one or more cationic fragments and one or more carbohydrate fragments connected through one or more linker fragments for controlling the viscoelasticity of the composition, wherein at least some carbohydrate fragments are connected to the linker fragments through ether bonds. The viscoelastic composition of the present technology may be used to alter fluid rheology and impart both viscous and elastic properties to the treated fluids. Applications of the viscoelastic composition of the present technology include, but are not limited to, oil field fluids such as, for example, well bore treatment fluids.