Trimer Fatty Acid Ester Rheology Modifier for Drilling Fluids
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Solution Overview
Problem
Rheology modifiers for invert emulsion drilling and well treatment fluids, such as trimer fatty acids, face issues with aquatic toxicity and poor biodegradability, posing environmental risks, particularly in marine environments, where favorable eco-toxicity data are required to predict ecosystem hazards.
Innovation Solution
The use of esters of trimer fatty acids and polyoxyethylene glycol, with an average molecular weight from 150 to 600 and at least 20% of carboxyl acid groups esterified, as a rheology modifier in water-in-oil emulsion fluids, which enhances viscosity and biodegradability while reducing aquatic toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If trimer fatty acids are used as rheology modifiers in invert emulsion fluids, then viscosity and rheological properties are improved, but aquatic toxicity increases and biodegradability decreases
Solution Approach 1:
The patent modifies the chemical structure of trimer fatty acids by esterifying at least 20% of carboxyl acid groups with polyoxyethylene glycol (molecular weight 150-600). This parameter change in molecular structure reduces aquatic toxicity while preserving rheology-modifying capabilities, directly resolving the contradiction between effectiveness and environmental harm.
Solution Approach 2:
The invention creates a composite molecule combining trimer fatty acid backbone with polyoxyethylene glycol side chains. This composite structure integrates the viscosity-enhancing properties of trimer acids with the environmentally benign characteristics of polyoxyethylene glycol, simultaneously achieving both improved rheology and reduced toxicity.
2Strength
If trimer fatty acids are used as rheology modifiers in invert emulsion fluids, then viscosity and rheological properties are improved, but biodegradability decreases
Solution Approach 1:
By esterifying carboxyl groups with polyoxyethylene glycol, the patent changes the chemical parameters of trimer fatty acids to improve biodegradability. The modified structure maintains sufficient molecular weight and complexity for rheology modification while introducing more biodegradable functional groups.
3Object-affected harmful factors
If esters of trimer fatty acids and polyoxyethylene glycol are used as rheology modifiers, then environmental compatibility is improved, but viscosity enhancement may be reduced compared to unmodified trimer acids
Solution Approach 1:
The patent optimizes the esterification degree (at least 20% but not exceeding 100%) to balance environmental compatibility and viscosity enhancement. This parameter optimization ensures sufficient rheology modification while maintaining the environmental benefits of the modified structure.
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 ester of trimer fatty acids and polyoxyethylene glycol significantly increases the viscosity of invert emulsion fluids and provides stable rheological properties across varying temperatures and shear rates, while demonstrating low aquatic toxicity and high biodegradability, thus addressing environmental compatibility concerns.
Implementation Method 1
the rheology modifier is an ester of trimer fatty acids and polyoxyethylene glycol... show increased viscosity
Data Source
AI summary
Water in oil emulsion drilling and well treatment fluids comprising an ester of trimer fatty acids and polyoxyethyiene glycol, the polyoxyethyiene glycol having average molecular weight from about (150) to about (600) and the trimer acids having at least about 20% of carboxyl acid groups esterified, as rheology modifier.