Charged Clay Nanoparticles Crosslink Polymers for Downhole Fluids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fracturing and injection fluids require high polymer concentrations to achieve desired viscosity, which can lead to instability at high temperatures and shear rates, and may bypass less permeable zones in hydrocarbon formations during injection operations, reducing hydrocarbon recovery efficiency.
Innovation Solution
Incorporating an effective amount of charged clay nanoparticles into aqueous downhole fluids, which crosslink polymers such as polyacrylamide, xanthan, and guar, reducing the necessary polymer concentration to achieve a pre-determined viscosity and enhancing temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high polymer concentrations are used to achieve desired viscosity, then the viscosity is sufficient, but the fluid stability deteriorates at high temperatures and shear rates
Solution Approach 1:
The patent combines polymers with charged clay nanoparticles to form a composite crosslinked structure. This composite approach allows the system to achieve desired viscosity with lower polymer concentrations while improving thermal stability through the nanoparticle-reinforced crosslinked network
Solution Approach 2:
The patent changes the chemical parameters by introducing charged clay nanoparticles that facilitate crosslinking reactions. This parameter change enables the formation of a more stable crosslinked gel structure that maintains viscosity at higher temperatures without requiring increased polymer concentration
2Productivity
If high polymer concentrations are used to achieve desired viscosity, then the viscosity is sufficient, but the fluid may bypass less permeable zones during injection operations
Solution Approach 1:
The composite of polymers and charged clay nanoparticles creates a crosslinked gel with optimized rheological properties that improves sweep efficiency during injection operations, preventing bypass of less permeable zones while using lower polymer concentrations
Solution Approach 2:
The introduction of charged clay nanoparticles changes the gel structure parameters, creating a more uniform crosslinked network that improves fluid distribution and sweep efficiency in heterogeneous formations, thereby enhancing hydrocarbon recovery from both high and low permeability zones
3Stability of the object's composition
If crosslinking agents are used to increase viscosity and keep proppants suspended, then proppant suspension is improved, but the fluid complexity increases
Solution Approach 1:
The charged clay nanoparticles serve a dual function: they act as crosslinking agents to suspend proppants and simultaneously provide structural reinforcement to the gel network, eliminating the need for additional separate crosslinking agents and reducing overall fluid complexity
Solution Approach 2:
The charged clay nanoparticles perform multiple functions within the fracturing fluid: crosslinking polymers to create gel structure, suspending proppants through the crosslinked network, and potentially providing rheological modification, thereby reducing the need for multiple separate additives
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 use of charged clay nanoparticles allows for reduced polymer amounts while maintaining viscosity, improving fluid stability and hydrocarbon recovery by effectively crosslinking polymers, thereby enhancing the efficiency of fracturing and injection operations.
Implementation Method 1
an effective amount of the charged nanoparticles to crosslink at least a portion of the polymers
Implementation Method 2
charged nanoparticles are clay nanoparticles
Data Source
AI summary
Charged nanoparticles may be added to an aqueous downhole fluid having polymers therein where the charged nanoparticles may crosslink at least a portion of the polymers. The polymers may be or include, but are not limited to polyacrylamide, xanthan, guar, polyacrylic acid, poly 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), polyethylene oxide, polypropylene oxide, or combinations thereof. The polymers may be homopolymers, copolymers, terpolymers, or combinations thereof. The charged nanoparticles may be or include, but are not limited to clay nanoparticles, modified nanoparticles, or combinations thereof. The aqueous downhole fluid may be or include, but is not limited to fracturing fluids, injection fluids, and combinations thereof for performing a fracturing operation, an injection operation, another enhanced oil recovery operation, and the like.