Surfactant Flowback Aid for Subterranean Formation Operations
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Solution Overview
Problem
During subterranean formation operations, such as hydraulic fracturing, treatment fluids and hydrocarbons can become trapped due to their size relative to the formation's pore throats, leading to reduced hydrocarbon production, and the presence of emulsions increases viscosity, negatively impacting permeability and production.
Innovation Solution
The use of surfactant flowback aid compositions, comprising a mesophase, microemulsion, or nanoemulsion with a surfactant blend of C8-C18 alcohol ethoxylate, fatty acid alkanolamide, and demulsifiers, which are introduced into the formation to separate water from crude oil, reduce emulsion formation, and enhance hydrocarbon recovery by lowering interfacial tension and improving fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If treatment fluids are introduced into the subterranean formation, then the formation is stimulated and permeability is improved, but hydrocarbons and treatment fluids become trapped in pore spaces reducing production
Solution Approach 1:
A flowback aid composition is introduced as an intermediary substance that reduces surface tension between hydrocarbons, water, and rock surfaces. This intermediary composition enables trapped hydrocarbons and treatment fluids to be mobilized and recovered from pore spaces, resolving the contradiction between formation stimulation and hydrocarbon trapping.
Solution Approach 2:
The flowback aid composition changes the interfacial tension parameters between hydrocarbons and aqueous phases, allowing trapped fluids to be displaced. By modifying these physical parameters, the composition enables recovery of hydrocarbons that were previously trapped due to size relative to pore throats.
2Productivity
If emulsions are present in the formation, then hydrocarbons can be transported, but viscosity increases reducing effective permeability and production
Solution Approach 1:
The flowback aid composition acts as a mediator that modifies emulsion properties by reducing interfacial tension between oil and water phases. This reduces emulsion viscosity while maintaining hydrocarbon transport capability, resolving the contradiction between transport efficiency and viscosity-related flow resistance.
Solution Approach 2:
The composition changes the rheological parameters of emulsions by reducing interfacial tension, thereby lowering viscosity. This allows emulsions to maintain their transport function while reducing the harmful viscosity effect on permeability and production.
3Speed
If surfactants are used to increase drainage speed, then de-watering is enhanced, but emulsion stability may be compromised affecting separation efficiency
Solution Approach 1:
The flowback aid composition uses a composite approach by combining multiple surfactants with complementary functions: one component enhances drainage speed by reducing water-hydrocarbon adhesion, while another component controls emulsion stability. This composite material strategy resolves the contradiction between speed enhancement and stability maintenance.
Solution Approach 2:
The composition applies different functional properties at different locations and stages: initially enhancing drainage speed through rapid de-watering, then providing controlled emulsion stability for efficient separation. This local quality differentiation allows the system to optimize both speed and stability at appropriate times.
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 surfactant flowback aid compositions effectively separate crude oil from aqueous phases, reduce emulsion viscosity, and enhance hydrocarbon recovery by stabilizing the flowback aid composition and facilitating the rapid separation of bulk crude oil from produced fluids, thereby improving production efficiency.
Implementation Method 1
surfactant flowback aid compositions... with a surfactant blend of C8-C18 alcohol ethoxylate, fatty acid alkanolamide, and demulsifiers, which are introduced into the formation to separate water from crude oil, reduce emulsion formation, and enhance hydrocarbon recovery by lowering interfacial tension
Implementation Method 2
The flowback aid compositions comprise one or more demulsifier compounds for efficient and effective separation of crude oil from an aqueous fluid phase
Data Source
AI summary
The embodiments herein relate generally to subterranean formation operations and, more particularly, to surfactant flowback aids for use in subterranean formation operations. The surfactant flowback aid composition may comprise an aqueous phase comprising an aqueous base fluid, a surfactant blend, and a demulsifier. The surfactant blend may comprise a C8-C18 alcohol ethoxy-late; a fatty acid alkanolamide; and optionally, a surfactant selected from the group consisting of a non-ionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and any combination thereof. The demulsifier may be selected from the group consisting of a desalter agent to separate water from crude oil, a treater agent to flocculate submicron particulates from crude oil, and any combination thereof.