Metallic Particle Activated Oxidative Breaking Method
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Solution Overview
Problem
Current breaker systems for viscosity-controlled wellbore fluids, such as those used in fracturing operations, often result in incomplete fluid removal and residual formation damage due to limited control over viscosity reduction, leading to impaired hydrocarbon production and prolonged clean-up times.
Innovation Solution
A method and system that includes adding a water-soluble oxidizing agent and metallic particles to aqueous fluids gelled with water-soluble polymers or viscoelastic surfactants, where the metallic particles dissolve to provide transition metal ions, accelerating the generation of free radicals and controlling the viscosity reduction, allowing for selective and enhanced breaking of the gelled fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional breaker systems are used to reduce viscosity of gelled fluids, then viscosity reduction is achieved, but fluid removal is incomplete and residual formation damage occurs
Solution Approach 1:
The patent changes the chemical parameters of the breaker system by introducing metallic particles (iron, copper, manganese, zinc, or aluminum) that dissolve to release metal ions. These metal ions catalyze the decomposition of the gelled fluid at a accelerated rate, changing the breaking mechanism from slow natural degradation to rapid catalytic breakdown, thereby achieving complete fluid removal without residual formation damage
Solution Approach 2:
The metallic particles serve as an intermediary substance that mediates between the gelled fluid and the breaking process. The metal particles dissolve to provide metal ions that act as catalysts, facilitating the decomposition of the gelled fluid. This intermediary mechanism enables complete and rapid breaking without direct harmful interaction with the formation, eliminating residual damage while ensuring complete fluid removal
2Duration of action of moving object
If internal breakers are used to control viscosity reduction rate, then controlled breaking is achieved, but breaking time is prolonged (1 to 8 hours)
Solution Approach 1:
The patent employs metallic particles that catalyze oxidative breakdown mechanisms. The metal ions generated from particle dissolution accelerate the decomposition of the gelled fluid through catalytic oxidation, transforming the breaking process from a slow controlled rate (1-8 hours) to a rapid accelerated process, thereby reducing breaking time while maintaining control over the viscosity reduction
3Reliability
If additional internal breakers are developed to enhance viscosity control, then breaking control is improved, but system complexity increases
Solution Approach 1:
The metallic particles provide a self-service breaking mechanism that automatically activates when introduced to the gelled fluid. The particles dissolve and release metal ions that catalyze the breaking process without requiring external control systems, additional chemicals, or complex monitoring mechanisms. This self-activating catalytic breakdown achieves precise viscosity control while keeping the system simple and easy to implement
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
This approach provides improved control over viscosity breaking, enabling faster and more complete fluid removal, reducing residual formation damage and production delays, and allowing for enhanced control over the breaking process within a wider temperature range.
Implementation Method 1
a water soluble oxidizing agent configured to generate free radicals
Implementation Method 2
metallic particles configured to dissolve in the gelled aqueous fluid and provide a reducing agent to accelerate the generation of free radicals
Implementation Method 3
metallic particles configured to dissolve in the gelled aqueous fluid and provide a reducing agent to accelerate the generation of free radicals
Data Source
AI summary
A method for breaking the viscosity of an aqueous fluid gelled with a water soluble polymer or a VES is disclosed. The method includes providing an aqueous fluid. The method also includes adding to the aqueous fluid, in any order: a water soluble polymer in an amount sufficient to form a gelled aqueous fluid having a viscosity, a water soluble oxidizing agent configured to generate free radicals and a plurality of metallic particles to produce a mixture comprising dispersed metallic particles dispersed within the gelled aqueous fluid, the metallic particles configured to dissolve in the gelled aqueous fluid and provide a reducing agent to accelerate the generation of free radicals. The method further includes dissolving the metallic particles in the gelled aqueous fluid to provide a source of at least one transition metal ion in an amount effective accelerate the generation of free radicals and reduce the viscosity.