Weakly Emulsifying Surfactants for Acidizing Fluids
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Solution Overview
Problem
Conventional surfactants used in subterranean treatments, such as hydraulic fracturing and acidizing, often result in sub-optimal oil and gas flow due to the formation of tight emulsions that block pore throats and channels, leading to reduced production.
Innovation Solution
The use of weakly emulsifying surfactants in treatment fluids that form short-lived oil-in-acid or oil-in-water emulsions, reducing interfacial surface tension and preventing acid-induced sludge, allowing for enhanced mobility of oil and gas through formations without the need for additional anti-sludge agents or penetrating surfactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional surfactants are used in treatment fluids, then surface tension reduction and wettability improvement are achieved, but tight emulsions form that block pore throats and channels, reducing production
Solution Approach 1:
The patent changes the emulsification parameter from strong (conventional surfactants) to weak (novel surfactants), achieving a balance where sufficient surface tension reduction occurs without forming harmful tight emulsions. This parameter optimization resolves the contradiction by tuning the surfactant properties to provide the desired interfacial activity while avoiding excessive emulsification.
Solution Approach 2:
Instead of using strong emulsifying surfactants that create stable emulsions, the patent inverts the approach by using weakly emulsifying surfactants that prevent tight emulsion formation. This inversion of the emulsification strength resolves the contradiction between achieving surface tension reduction and avoiding harmful emulsion blockages.
2Object-generated harmful factors
If non-emulsifying surfactants are used to avoid tight emulsions, then pore blockage is prevented, but oil and gas flow remains sub-optimal
Solution Approach 1:
The patent optimizes the emulsification parameter to a moderate level (weakly emulsifying) rather than extreme values (non-emulsifying or strongly emulsifying). This intermediate parameter setting allows the surfactant to provide sufficient interfacial activity to enhance oil and gas flow while maintaining enough stability to prevent pore blockage, resolving the contradiction between these two requirements.
3Force
If strongly emulsifying surfactants are used, then interfacial activity is enhanced, but stable tight emulsions form that plug fractures and channels
Solution Approach 1:
The patent adjusts the emulsion stability parameter from high (strongly emulsifying surfactants) to low (weakly emulsifying surfactants). This parameter change reduces the stability of emulsions to prevent plug formation while maintaining sufficient interfacial activity through optimized surfactant structure and concentration, resolving the contradiction between these two properties.
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 weakly emulsifying surfactants improve oil and gas production by preventing tight emulsions, enhancing migration and flow through formations, and delaying acid spending, leading to larger voids and increased permeability.
Implementation Method 1
reducing interfacial surface tension
Implementation Method 2
form short-lived oil-in-acid or oil-in-water emulsions
Data Source
AI summary
Provided are acidic treatment fluids comprising a weakly emulsifying surfactant, an aqueous base fluid, and an acid. In some embodiments, the treatment fluids are capable of forming short-lived oil-in-acid emulsions due, at least in part, to the interaction of at least a portion of the weakly emulsifying surfactant with one or more oil or gas molecules within a subterranean formation.