Ionic Liquid Surfactant Solution for Carbonate Reservoir Wettability
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Solution Overview
Problem
Current methods for enhancing oil recovery in carbonate reservoirs are limited by the rapid cementing of sedimentary rock, which reduces porosity, and existing surfactant and water flooding techniques do not effectively alter wettability to release trapped hydrocarbons.
Innovation Solution
A composition of an ionic liquid and a surfactant in an aqueous solution is introduced into the reservoir, modifying the wettability from oil-wet to water-wet without significantly impacting interfacial tension, thereby enhancing imbibition recovery by improving the interaction between water and hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional surfactant flooding is used to enhance oil recovery, then some hydrocarbons can be released, but the wettability alteration is insufficient to effectively release trapped hydrocarbons in fractured carbonate reservoirs
Solution Approach 1:
The patent combines ionic liquids with traditional surfactants to create a composite chemical system. The ionic liquid component (such as imidazolium-based ionic liquids) works synergistically with the surfactant to achieve superior wettability alteration compared to surfactants alone. This composite approach addresses the insufficient wettability modification problem by introducing a new chemical component that enhances the overall effectiveness of the flooding process in fractured carbonate reservoirs.
Solution Approach 2:
The invention changes the chemical parameters of the flooding solution by incorporating ionic liquids with specific properties (such as hydrophilic-hydrophobic balance and surface activity). These parameter changes enable more effective interaction with the carbonate rock surface and trapped hydrocarbons, improving wettability alteration and oil recovery beyond what traditional surfactants can achieve alone.
2Productivity
If water flooding is used to enhance oil recovery, then the process is simple and cost-effective, but it cannot effectively alter wettability to release trapped hydrocarbons in oil-wet carbonate formations
Solution Approach 1:
The invention transforms ordinary water flooding into a chemically enhanced process by adding ionic liquids and surfactants. This changes the interfacial and adsorption parameters of the flooding solution, enabling it to effectively alter wettability in oil-wet carbonate formations while maintaining the simplicity and cost-effectiveness of the water flooding approach.
Solution Approach 2:
The ionic liquid acts as an intermediary substance that facilitates the interaction between water and the oil-wet carbonate rock surface. It mediates the wettability alteration process by adsorbing onto the rock surface and displacing oil, thereby enabling water to become the dominant phase and improve oil recovery without requiring complex processing.
3Productivity
If ionic liquid and surfactant are used together, then synergistic effect exceeds the impact of either component alone, but the composition complexity increases
Solution Approach 1:
The patent merges ionic liquids and surfactants into a single integrated chemical system designed for synergistic action. The combination is formulated so that the two components work together to enhance imbibition recovery, with the ionic liquid and surfactant complementary to each other's mechanisms of action, achieving greater effectiveness than the sum of individual components.
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 ionic liquid enhanced surfactant solution significantly increases oil recovery by altering wettability and reducing interfacial tension, leading to improved imbibition recovery compared to traditional methods, with the combination of surfactant and ionic liquid showing a synergistic effect that exceeds the impact of either component alone.
Implementation Method 1
the aqueous solution is configured to modify the wettability value of the carbonaceous hydrocarbon-bearing formation from a first value to a second value that is more water-wet than the first value
Implementation Method 2
where there is an interfacial tension value between the aqueous composition and hydrocarbons present in the carbonaceous hydrocarbon-bearing formation
Implementation Method 3
thereby enhancing imbibition recovery by improving the interaction between water and hydrocarbons
Data Source
AI summary
Provided is a composition that may include a mixture of an ionic liquid and a surfactant in an aqueous composition, where a carbonaceous hydrocarbon-bearing formation has a wettability value and comprises hydrocarbons, where there is an interfacial tension value between the aqueous composition and hydrocarbons present in the carbonaceous hydrocarbon-bearing formation, where the aqueous solution may be configured to modify the wettability value of the carbonaceous hydrocarbon-bearing formation from a first value to a second value that is more water-wet than the first value, and where the presence of the ionic liquid in the aqueous composition may not substantially impact the value for interfacial tension between the hydrocarbons in the carbonaceous hydrocarbon-bearing formation and the aqueous composition. Further provided is a method that may introduce the aqueous composition into a carbonaceous hydrocarbon-bearing formation.