Surfactant Composition for Fracturing Fluid Wettability Alteration
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Solution Overview
Problem
Existing fracturing fluids do not effectively alter the wettability of subterranean formations from oil-wet to water-wet, leading to suboptimal oil recovery, especially in high temperature and high salinity environments.
Innovation Solution
A surfactant solution comprising an ether sulfonate and an alkyl alkoxylated nonionic surfactant, along with a solvent and water, which is thermally and hydrolytically stable, is mixed with fracturing fluids to change the wettability of subterranean formations, improving oil recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fracturing fluids are used, then the formation maintains its original wettability, but oil recovery remains suboptimal
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the fracturing fluid through the inclusion of specific surfactants (anionic and nonionic) at optimized concentrations. These compositional parameter changes enable the fluid to alter the wettability of the formation from oil-wet to water-wet, thereby improving oil recovery while maintaining reliability in high temperature and salinity conditions.
Solution Approach 2:
The patent employs composite materials by combining multiple surfactant types (anionic ether sulfonate and nonionic alkyl alkoxylated surfactants) with solvents and water to create a composite surfactant solution. This composite formulation synergistically enhances wettability alteration effectiveness and thermal stability, resolving the contradiction between improving oil recovery and maintaining reliability under harsh conditions.
2Reliability
If standard surfactants are used in high temperature environments, then wettability alteration is attempted, but thermal degradation occurs
Solution Approach 1:
The patent addresses thermal stability by optimizing the molecular structure parameters of the surfactants selected. The anionic ether sulfonate and nonionic alkyl alkoxylated surfactants are specifically chosen for their thermal and hydrolytic stability at high temperatures. This parameter optimization allows the surfactant solution to maintain its wettability alteration capability without degradation even in high temperature reservoir conditions.
Solution Approach 2:
The patent selects surfactant molecules with inherent resistance to thermal degradation, effectively choosing 'long-lived' chemical structures that can withstand high temperature environments without breaking down. This selection criterion ensures the surfactant solution maintains its functional integrity and wettability alteration effectiveness throughout the fracturing process and subsequent production phase.
3Reliability
If conventional surfactants are used in high salinity conditions, then wettability alteration is attempted, but surfactant performance degrades
Solution Approach 1:
The patent addresses salinity tolerance by selecting surfactants with specific molecular parameters that confer resistance to ionic interference. The anionic ether sulfonate and nonionic alkyl alkoxylated surfactants are chosen for their ability to maintain surface activity and wettability alteration effectiveness in the presence of high concentrations of dissolved salts and hardness ions, thus resolving the contradiction between maintaining reliability and tolerating high salinity conditions.
4Reliability
If a single surfactant type is used, then the formulation is simple, but effectiveness in changing wettability is insufficient
Solution Approach 1:
The patent applies composite materials by formulating a surfactant solution that combines anionic ether sulfonate surfactants with nonionic alkyl alkoxylated surfactants. This composite approach creates a synergistic effect where the two surfactant types work together to achieve superior wettability alteration effectiveness compared to single surfactant systems, while the complexity is managed through optimized concentration ranges for each component.
Solution Approach 2:
The patent merges two different surfactant mechanisms (anionic and nonionic) into a single unified surfactant solution formulation. This combining of surfactant types allows the solution to effectively interact with both oil and water phases, enhancing the wettability alteration capability from oil-wet to water-wet conditions while maintaining a practical and manufacturable formulation.
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 solution effectively changes the wettability from oil-wet to water-wet, enhancing oil recovery in high temperature and high salinity conditions, demonstrating thermal stability and compatibility with connate water.
Implementation Method 1
a surfactant additive that is thermal and hydrolytically stable at high temperature, is tolerant of water of high salinity and hardness, and could change the wettability of subterranean formations from oil-wet to water-wet
Implementation Method 2
change the wettability of subterranean formations from oil-wet to water-wet
Data Source
AI summary
A novel surfactant composition that comprises of two surfactant components, a solvent, and water. The surfactant composition is added to a fracturing fluid, which is then pumped downhole into a subterranean formation where the novel characteristics of the fracturing fluid lend to improved oil production over the fracturing fluid without the surfactant composition.