Cellulose Fiber Nanoparticle Composite for Subterranean Fluid Suspension
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Solution Overview
Problem
Current subterranean treatment fluids face challenges in suspending particles effectively at low concentrations of nanocellulose, leading to poor suspension capabilities and fluid loss in hydrocarbon production processes.
Innovation Solution
A treatment fluid comprising a mixture of cellulose fibers and cellulose nanoparticles, where the nanoparticles have a negative or positive zeta potential and a specific size range, is introduced to enhance suspension capabilities and prevent fluid loss by forming a network that increases viscosity and yield stress, allowing for effective particle suspension and circulation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If nanocellulose concentration is reduced in treatment fluid, then fluid loss is reduced and environmental impact is minimized, but suspension capability deteriorates and particles settle
Solution Approach 1:
The patent combines cellulose fibers and cellulose nanoparticles into a composite system where the fiber network provides mechanical suspension support while nanoparticles enhance viscosity at low concentrations. This composite approach allows effective particle suspension at lower total nanocellulose concentrations (0.01-5 wt%) compared to using nanoparticles alone, thereby reducing fluid loss while maintaining suspension capability.
Solution Approach 2:
The patent modifies the zeta potential of cellulose nanoparticles through surface treatment or selection of specific nanoparticle types to optimize their interaction with suspended particles and fluid components. By adjusting this electrical parameter, the nanoparticles achieve enhanced suspension effectiveness at lower concentrations, resolving the contradiction between reduced nanocellulose content and maintained suspension capability.
2Reliability
If nanocellulose concentration is increased to improve suspension capability, then particle suspension improves, but fluid viscosity increases excessively and fluid loss worsens
Solution Approach 1:
The synergistic composite system of cellulose fibers and nanoparticles achieves effective suspension at lower concentrations (0.01-5 wt% nanocellulose total) compared to using nanoparticles alone. The fiber network provides structural support for suspension while requiring minimal nanoparticle content for viscosity enhancement, thus preventing excessive viscosity increase and associated fluid loss.
Solution Approach 2:
The patent utilizes the localized network formation capability of cellulose fibers to provide suspension support in specific regions where particles need to be held, while nanoparticles provide localized viscosity enhancement. This distributed functional approach allows effective suspension with lower overall nanocellulose concentration, avoiding the fluid loss problems associated with high concentration formulations.
3Reliability
If additional components are added to aid suspension at low nanocellulose concentrations, then suspension capability improves, but fluid composition complexity and cost increase
Solution Approach 1:
The cellulose fiber-nanoparticle composite system performs multiple functions simultaneously: the fiber network provides mechanical suspension support, nanoparticles enhance viscosity, and the zeta-modified nanoparticle surfaces prevent particle aggregation. This multi-functional system achieves effective suspension at low concentrations without requiring additional chemical additives, simplifying the overall fluid composition.
Solution Approach 2:
The cellulose fiber and nanoparticle components work synergistically to provide their own suspension and viscosity enhancement functions without requiring external chemical additives. The system is self-sufficient, using the intrinsic properties of the cellulose components (modified only by zeta potential adjustment) to achieve the desired suspension capability, thereby avoiding complexity from additional 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 combination of cellulose fibers and nanoparticles improves particle suspension at lower concentrations, reduces fluid loss, and enhances the viscosity of treatment fluids, thereby improving hydrocarbon production and circulation control in subterranean formations.
Implementation Method 1
Nanocelluloses, such as NCC particles, have the capability of forming inter and intra hydrogen bonding amongst the particles in water based treatment fluids. This network formation helps suspend particles within the treatment fluid.
Implementation Method 2
This network formation helps suspend particles within the treatment fluid. For treatment fluids containing nanocelluloses, suspension of the components of the fluid is able to take place above a certain threshold nanocellulose concentration
Implementation Method 3
the cellulose nanoparticles have a negative zeta potential or a positive zeta potential
Data Source
AI summary
A fluid for treating a subterranean formation includes a solvent, a rheology modifier, and a composition that includes a mixture of cellulose fibers and cellulose nanoparticles. The cellulose nanoparticles have a positive zeta potential in a range of about +100 mV to about +10 mV, and a length in a range of from about 50 nm to about 500 nm, and the cellulose fibers have a length from about 50 microns to about 500 microns.