Zwitterionic Imidazoline Emulsifier for High-Temperature Drilling Fluids

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Solution Overview

Problem

Existing invert emulsifiers for drilling fluids lack stability at high temperatures, and prior art does not effectively utilize unsaturated mono carboxylic acids in their formulation.

Innovation Solution

A zwitterionic imidazoline invert emulsifier is synthesized by reacting unsaturated mono carboxylic acid with the reaction product of fatty acids and polyalkylene polyamines, providing enhanced stability and performance characteristics such as high temperature stability and improved rheology in drilling fluids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional invert emulsifiers are used in drilling fluids, then the emulsion can be formed, but the emulsion loses stability at high temperatures exceeding 400°F

Engineering Contradiction:

Improveemulsion stabilityVSAvoidtemperature stability

Core Design Contradiction:

Stability of the object's compositionVSTemperature

Solution Approach 1:

The patent modifies the chemical structure of conventional emulsifiers by incorporating unsaturated mono carboxylic acids with specific functional groups (carboxyl, hydroxyl, or carboxylate) that enable the emulsifier to maintain structural integrity and emulsion stability at temperatures exceeding 400°F. This parameter change in molecular structure directly resolves the temperature-stability contradiction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite emulsifier system by combining polyalkylene polyamines with unsaturated mono carboxylic acids to form zwitterionic imidazoline derivatives. This composite molecular structure integrates the beneficial properties of both components, achieving enhanced thermal stability while maintaining emulsion formation capabilities.

Inventive Principle:

Principle #40Composite materials

2Reliability

If existing emulsifier formulations are used, then fluid emulsion can be established, but fluid losses increase and rheology parameters deteriorate under high temperature conditions

Engineering Contradiction:

Improvefluid loss controlVSAvoidhigh temperature performance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the chemical parameters of the emulsifier by using unsaturated mono carboxylic acids with specific functional groups that provide superior thermal stability. This parameter change enables the emulsifier to maintain effective fluid loss control and rheology under high temperature conditions, directly addressing the reliability-temperature contradiction.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If conventional emulsifiers are used, then water emulsion can be formed in oil, but the emulsifier cannot maintain stability at temperatures above 400°F

Engineering Contradiction:

Improveemulsion stabilityVSAvoidtemperature resistance

Core Design Contradiction:

Stability of the object's compositionVSTemperature

Solution Approach 1:

The invention changes the molecular parameters of the emulsifier by incorporating unsaturated mono carboxylic acids with specific functional groups (carboxyl, hydroxyl, or carboxylate) that provide thermal resistance up to temperatures above 400°F, resolving the contradiction between emulsion stability and temperature resistance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure by reacting polyalkylene polyamines with unsaturated mono carboxylic acids to form zwitterionic imidazoline derivatives. This composite structure combines the emulsifying properties of polyamines with the thermal stability of unsaturated carboxylic acids, achieving both emulsion stability and high-temperature resistance.

Inventive Principle:

Principle #40Composite materials

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 novel emulsifier achieves high emulsion stability, low fluid losses, and improved rheology parameters, allowing drilling fluids to maintain stability at temperatures exceeding 400°F and withstand differential pressures of 500 psi with zero water content in fluid loss filtrate.

Implementation Method 1

The emulsifier is required not only to form a stable dispersion of water droplets in the oil phase

Methodology Applied

Scientific EffectEmulsification: Emulsion

Implementation Method 2

imparts stability to the drilling fluid at elevated temperature

Methodology Applied

Scientific EffectThermal stability:

Implementation Method 3

fluid loss control additives

Methodology Applied

Scientific EffectFluid loss control:

Data Source

PatentUS12258515B2Invert emulsifier for use in invert emulsion drilling fluids

Publication Date: 2025.03.25 GUMPRO DRILLING FLUIDS PVT LTD

AI summary

An oil soluble invert emulsifier and a process for preparation thereof, including invert emulsion drilling fluid compositions and their use, are described. The oil soluble invert emulsifier is synthesized from fatty acid reaction with polyalkylene polyamines and unsaturated mono carboxylic acids. The emulsifier is further modified with multivalent alkali metal salts. The emulsifier stabilizes the invert emulsion drilling fluid at temperatures exceeding 400° F. and imparts improved fluid properties.