Ester-Structure Viscosifier for Oil-Based Drilling Fluids
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Solution Overview
Problem
Current oil-based drilling fluids lack effective biodegradability and low toxicity, particularly for offshore applications where they come into contact with marine environments, posing risks to microbial life forms and ecosystems.
Innovation Solution
A mixture of esters is created by reacting trimer fatty acids, fatty acids, and hydroxy monocarboxylic acids, which serves as a viscosifier for drilling fluids, enhancing biodegradability and reducing toxicity. The esterification process involves mixing these components at elevated temperatures under a protective gas atmosphere, resulting in a product that is effectively biodegradable and suitable for use in drilling fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oil-based drilling fluids are used to achieve effective viscosifying properties, then the viscosity control is satisfactory, but the biodegradability is poor and toxicity is high
Solution Approach 1:
The invention changes the chemical composition parameters of the viscosifier by using esters derived from trimer fatty acids (50-90 wt%), fatty acids (5-40 wt%), and hydroxy monocarboxylic acids (5-40 wt%), rather than conventional viscosifiers. This parameter change maintains viscosifying performance while improving biodegradability and reducing toxicity towards marine microorganisms.
Solution Approach 2:
The invention uses a composite ester structure combining multiple fatty acid components (trimer, fatty, and hydroxy monocarboxylic acids) to create a viscosifier that achieves both effective viscosity control and environmental compatibility. The composite nature of the ester mixture provides the necessary rheological properties while the specific composition ensures biodegradability.
2Object-affected harmful factors
If additives are designed for low toxicity and high biodegradability, then environmental compatibility is improved, but viscosifying effectiveness may be reduced
Solution Approach 1:
The invention optimizes the molecular weight and structural parameters of the ester components to achieve both biocompatibility and viscosifying effectiveness. The specific ratio of trimer fatty acids (50-90 wt%), fatty acids (5-40 wt%), and hydroxy monocarboxylic acids (5-40 wt%) creates esters with appropriate molecular size and functional groups that interact effectively with drilling fluid components while being biodegradable.
Solution Approach 2:
The invention copies the successful viscosifying mechanism of conventional additives (such as lignosulfonates and carboxymethyl cellulose) but implements it through ester structures that are inherently more biodegradable. The esters replicate the thickening and viscosity-control functions through similar rheological mechanisms while using environmentally benign chemical structures.
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 mixture demonstrates improved biocompatibility and biodegradability, meeting the demand for environmentally friendly drilling fluids with reduced toxicity, making it suitable for offshore drilling operations while maintaining effective viscosifying properties.
Implementation Method 1
a mixture of esters obtainable by reacting components of an esterifiable composition with each other, wherein the esterifiable composition comprises at least one trimer fatty acid, at least one fatty acid and at least one hydroxy monocarboxylic acid
Data Source
AI summary
The present invention relates to a mixture of esters obtainable by reacting components of an esterifiable composition with each other, wherein the esterifiable composition comprises at least one trimer fatty acid, at least one fatty acid and at least one hydroxy monocarboxylic acid and a production process of the mixture of esters. Furthermore, the present invention relates to environmental friendly, preferably oil based, drilling fluids comprising the above-mentioned mixture of esters, water and an organic phase and the use of said mixture as viscosifier for drilling fluids.