Nanoparticle Wedge Effect for Water Wettability Alteration
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Solution Overview
Problem
Oil-heavy components such as asphaltenes and waxes on rock surfaces in subterranean formations reduce permeability and trap oil, hindering fluid flow and oil recovery by maintaining an oil-wet surface, which complicates refracturing, restimulating, and enhanced oil recovery operations.
Innovation Solution
A treatment fluid comprising aminopolycarboxylic acid and nanoparticles that self-aggregate into microstructures, forming a film on rock surfaces to increase disjoining pressure and separate oil droplets, altering the rock surface to be water-wet, thereby improving permeability and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If nanoparticles form a film on rock surfaces to separate oil droplets, then water wettability is achieved and permeability improves, but the complexity of the treatment process increases
Solution Approach 1:
The nanoparticles self-aggregate into microstructures and automatically form a film on the rock surface when exposed to oil droplets, utilizing the natural interfacial tension and disjoining pressure effects. This self-organizing behavior eliminates the need for complex external control mechanisms, allowing the system to achieve wettability alteration autonomously while maintaining operational simplicity
Solution Approach 2:
The treatment utilizes changes in interfacial parameters (surface tension, disjoining pressure) to achieve wettability reversal. By adjusting nanoparticle concentration and size distribution, the system optimizes film formation and oil droplet separation without requiring complex process equipment, transforming the rock surface from oil-wet to water-wet through controlled parameter modifications
2Productivity
If treatment fluid is introduced to remove oil coatings from rock surfaces, then permeability and fluid flow improve, but the quantity of treatment material required increases
Solution Approach 1:
The nanoparticles selectively extract and remove oil heavy ends (asphaltenes and waxes) from the rock surface through adsorption and film formation. This targeted extraction approach concentrates the treatment action on the harmful oil components rather than requiring bulk displacement of all fluids, thereby improving oil recovery efficiency while minimizing the total volume of treatment fluid needed
Solution Approach 2:
The treatment fluid employs composite nanoparticle systems with specific size distributions and surface properties that enhance oil removal efficiency. These composite structures provide multiple functional mechanisms (adsorption, steric stabilization, electrostatic repulsion) in a single treatment agent, increasing productivity per unit volume of treatment material
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 treatment fluid effectively removes oil coatings from rock surfaces, enhancing fluid flow and permeability by converting oil-wet surfaces to water-wet, reconnecting fractures, and unblocking proppant packs, thus improving oil recovery operations.
Implementation Method 1
The film diffuses to the rock surface through Brownian motion and wedges under the oil droplets coating the rock surface. Once in place, the formed wedge increases the disjoining pressure to separate the oil droplets from the rock surface.
Implementation Method 2
the formed wedge increases the disjoining pressure to separate the oil droplets from the rock surface
Implementation Method 3
The nanoparticle microstructures and the aminopolycarboxylic acid come into contact with a discontinuous phase, such as a rock surface with mixed wettability, and form a film thereon. The electrostatic forces between the nanoparticle microstructures separate the oil globules from the surface
Implementation Method 4
altering the wettability of the rock surface to be water-wet. The nanoparticle microstructures and the aminopolycarboxylic acid come into contact with a discontinuous phase, such as a rock surface with mixed wettability, and form a film thereon
Data Source
AI summary
Methods and treatments fluids for treating a wellbore. One example method introduces the treatment fluid into the wellbore. The treatment fluid comprises an aqueous fluid, an aminopolycarboxylic acid, a nanoparticle dispersed, and an organic solvent. The treatment fluid has a pH in a range between about 5 to about 9. The method further includes contacting a rock surface in the subterranean formation; wherein at least a portion of the rock surface is coated with a hydrocarbon. The treatment fluid removes a portion of the hydrocarbon from the rock surface and alters the rock surface to be water-wet.