Zwitterionic Surfactant Microemulsifier for High Salinity Wellbore Cleaning

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Solution Overview

Problem

Current wellbore servicing fluids face challenges in efficiently cleaning casing and removing filtercakes due to thermal instability of non-ionic surfactants and toxicity issues with cationic or anionic surfactants, especially in high salinity brines, limiting their versatility and effectiveness.

Innovation Solution

A method involving a zwitterionic surfactant and co-surfactant combination to form a microemulsifier, which is contacted with an oleaginous fluid under low shear conditions to create a stable microemulsion, effectively removing oil-based residues and filtercakes in wellbores, even in high salinity environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If non-ionic surfactants are used in high salinity brines, then salt tolerance and indifference to multivalent ions are improved, but thermal stability deteriorates due to cloud point phase separation

Engineering Contradiction:

Improvesalt toleranceVSAvoidthermal stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the surfactant by using zwitterionic surfactants with specific molecular structures (containing both positive and negative charges) rather than conventional non-ionic surfactants. This parameter change allows the surfactant to maintain solubility and stability at high temperatures in brine environments while retaining salt tolerance, effectively resolving the cloud point issue.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite surfactant systems combining zwitterionic surfactants with co-surfactants to create microemulsions that exhibit both thermal stability and salt tolerance. The synergistic interaction between different surfactant components enables the system to overcome the limitations of individual surfactant types.

Inventive Principle:

Principle #40Composite materials

2Reliability

If cationic or anionic surfactants are used instead of non-ionic surfactants, then thermal stability and versatility are improved, but toxicity issues arise

Engineering Contradiction:

Improvethermal stabilityVSAvoidtoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the charge characteristic parameter of the surfactant from cationic or anionic to zwitterionic (containing both positive and negative charges in the same molecule). This parameter change reduces toxicity while maintaining thermal stability and effectiveness in brine environments, as zwitterionic surfactants are generally less toxic and more biodegradable.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional surfactants are used for cleaning casing and removing filtercake, then cleaning effectiveness is achieved, but compatibility with high salinity brines deteriorates

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidbrine compatibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent changes the surfactant molecular structure parameter to zwitterionic type, which maintains cleaning effectiveness through strong interfacial activity while simultaneously improving compatibility with high salinity brines through electrostatic shielding effects and maintained solubility in saline environments.

Inventive Principle:

Principle #35Parameter changes

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 zwitterionic surfactant-based microemulsifier demonstrates thermal stability and versatility, efficiently solubilizing oleaginous fluids, removing oil-based residues and filtercakes, and maintaining effectiveness across various brine types without toxicity concerns, enhancing wellbore servicing operations.

Implementation Method 1

contacting the microemulsifier with an oleaginous fluid under low shear conditions to form a microemulsion

Methodology Applied

Scientific EffectMicroemulsion formation: Microemulsion

Implementation Method 2

contacting a zwitterionic surfactant, co-surfactant, and water to form a microemulsifier

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentUS7960314B2Microemulsifiers and methods of making and using same

Publication Date: 2011.06.14 HALLIBURTON ENERGY SERVICES INC

AI summary

A method comprising contacting a zwitterionic surfactant, co-surfactant, and water to form a microemulsifier, and contacting the microemulsifier with an oleaginous fluid under low shear conditions to form a microemulsion. A method comprising introducing a first wellbore servicing fluid comprising at least one oleaginous fluid into a wellbore, wherein the first wellbore servicing fluid forms oil-wet solids and/or oil-wet surfaces in the wellbore, and contacting the oil-wet solids and/or oil-wet surfaces in the wellbore with a second wellbore servicing fluid comprising a zwitterionic surfactant, a co-surfactant, and a brine to form a microemulsion.