Amide Emulsifier for High-Temperature Drilling Fluids
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Solution Overview
Problem
Existing wellbore drilling fluids face challenges in maintaining consistent rheological properties over a wide temperature range and require complex, costly synthesis processes for emulsifiers, limiting their efficiency and stability, especially in high-temperature applications.
Innovation Solution
A wellbore fluid comprising an oleaginous external phase, a non-oleaginous internal phase, and an emulsifier formed by reacting a primary fatty amine with a cyclic anhydride or diacid, which produces a reaction product with specific structures (A and B) that provide improved emulsification and tunability, allowing for simpler production and enhanced performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing amido-amine based emulsifiers are used, then emulsification function is provided, but synthesis process becomes complex and costly
Solution Approach 1:
The patent extracts and eliminates the complex amido-amine synthesis pathway by using a simplified reaction between fatty acid and amine to form amide emulsifiers. This removes unnecessary synthesis steps while maintaining the essential emulsification function, directly addressing the contradiction between manufacturing simplicity and structural complexity.
Solution Approach 2:
The patent changes the synthesis parameters by operating at lower temperatures (60-80°C) and using simpler reactants (fatty acid and amine) compared to traditional high-temperature amido-amine synthesis. This parameter change achieves both simplified manufacturing and reduced structural complexity while maintaining emulsifier performance.
2Productivity
If complex synthesis processes are used for emulsifiers, then performance characteristics may be optimized, but production cost and time increase
Solution Approach 1:
The patent performs preliminary action by pre-synthesizing the amide emulsifier through a simple, rapid reaction that can be quickly integrated into the drilling fluid formulation process. This preliminary synthesis step eliminates time-consuming multi-step procedures and achieves both high productivity and reduced production time.
Solution Approach 2:
The patent employs a disposable, single-use emulsifier synthesis approach where the amide emulsifier is made in-situ during drilling operations rather than requiring long-term storage of complex synthesized products. This eliminates the need for complex, time-consuming synthesis processes while maintaining effective emulsifier performance throughout the drilling operation.
3Reliability
If existing emulsifiers are used in high-temperature conditions, then drilling operations can proceed, but rheological properties become unstable
Solution Approach 1:
The patent changes the chemical parameters of the emulsifier by using amide structures formed from fatty acids and amines, which have different thermal stability characteristics compared to traditional emulsifiers. This parameter change enables the emulsifier to maintain stable rheological properties across a wider temperature range, directly resolving the contradiction between reliability and temperature tolerance.
Solution Approach 2:
The patent creates a composite emulsifier system combining the amide structure with fatty acid and amine components, which works synergistically to provide both emulsification function and thermal stability. This composite approach maintains rheological property stability in high-temperature drilling conditions while allowing operational flexibility across varying temperature ranges.
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 proposed emulsifier system offers a simpler and more efficient method for producing wellbore fluids with stable rheological properties across varying temperatures, reducing synthesis complexity and costs while improving performance in high-temperature drilling conditions.
Implementation Method 1
an emulsifier formed by reacting a primary fatty amine with a cyclic anhydride or diacid, which produces a reaction product with specific structures (A and B)
Implementation Method 2
an emulsifier composition that includes a reaction product of a fatty amine and a capping agent... providing alternatives to existing amido-amine based emulsifiers
Data Source
AI summary
Drilling fluid compositions include an emulsifier having a generic structure A, structure B, or a combination thereof. Structure A includes an amide (e.g., amic acid group) and structure B includes a cyclic imide. The emulsifier of the emulsifier system is formed by reacting a fatty oil amine (e.g., oleyl amine), with a cyclic anhydride (e.g., succinic anhydride) in the absence of diluent or in a diluent that does not react with the starting materials. The reaction takes place via application of a stepwise increase in temperature. An emulsifier based on structure A is formed when the reaction temperature is maintained at 50 to 100° C. for 1 to 3 hours. A further increase in reaction temperature (e.g., up to 200° C.) can include water elimination which results predominately in the formation of a molecule represented by structure B.