Ampholyte Polymers for Self-Breaking Fracturing Fluids
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Solution Overview
Problem
The use of polymers in subterranean operations often results in residual materials that reduce well productivity, require additional breaker treatments, and increase operational complexity and cost, especially in high salinity environments.
Innovation Solution
Ampholyte polymeric compounds with nonionic, cationic, and sulfonic acid-containing monomers are used as gelling agents that can break down over time without the need for subsequent treatments, reducing the viscosity of treatment fluids and minimizing the use of breakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymers are used as gelling agents in treatment fluids, then viscosity is increased for effective fluid suspension and transport, but residual polymer materials remain in the formation and plug pores, reducing well productivity
Solution Approach 1:
The patent employs environmentally responsive polymers that undergo parameter changes in response to formation conditions (temperature, pH, salinity). These polymers transform from high-viscosity gelling agents into low-viscosity or degradable forms under specific formation conditions, allowing them to provide necessary viscosity during treatment while subsequently breaking down to eliminate pore-plugging residues and maintain well productivity
Solution Approach 2:
The patent utilizes dynamic polymers whose molecular structure and viscosity characteristics are not static but change over time and in response to environmental conditions. These polymers dynamically adjust their properties - maintaining high viscosity during injection and suspension operations, then degrading or transforming into smaller molecules that can be easily flushed from the formation, thus resolving the contradiction between needing high viscosity and avoiding productivity loss
2Strength
If breakers are introduced in separate treatments to degrade polymer viscosity, then fluid viscosity is reduced for flowback operations, but operational complexity, cost, and time are increased
Solution Approach 1:
The patent employs self-degrading polymers that automatically break down under formation conditions without requiring external breaker chemicals or additional treatment operations. The polymers contain built-in degradation mechanisms triggered by formation temperature, pH, or salinity conditions, enabling them to self-limit their viscosity and facilitate flowback operations, thereby eliminating the need for separate breaker treatments and reducing operational complexity
Solution Approach 2:
The patent incorporates preliminary degradation mechanisms within the polymer structure itself, designed to activate automatically under specific formation conditions. This preliminary action is built into the polymer chemistry, allowing it to pre-program its own breakdown sequence - maintaining viscosity when needed, then automatically degrading to facilitate flowback without requiring additional operational steps or external chemical interventions
3Strength
If traditional polymers like guar gum are used for viscosification, then effective suspension and transport is achieved, but insoluble residues and unbroken gel clumps remain after breaker treatment, impairing formation conductivity
Solution Approach 1:
The patent employs composite polymer structures combining multiple functional components - hydrophilic segments for suspension capability, hydrophobic segments for controlled degradation, and potentially biodegradable linkages. This composite structure enables the polymer to provide effective suspension and transport during treatment while ensuring complete breakdown into soluble or biodegradable fragments that do not form insoluble residues or gel clumps, thus maintaining formation conductivity
Solution Approach 2:
The patent utilizes polymers with parameter-changing properties that respond to formation conditions by transforming their molecular structure. These polymers undergo parameter changes - such as hydrolysis, depolymerization, or biodegradation - that convert them from high-molecular-weight suspending agents into low-molecular-weight soluble products, eliminating the formation of insoluble residues and unbroken gel clumps that plague traditional polymer systems
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 allows for efficient wellbore operations with reduced costs and complexity by enabling the use of ampholyte polymeric compounds in high TDS fluids, minimizing the need for breakers, and maintaining well productivity by avoiding residual materials.
Implementation Method 1
ampholyte polymeric compounds...as gelling agents in subterranean operations
Implementation Method 2
break down over time without the need for subsequent treatments, reducing the viscosity of treatment fluids
Data Source
AI summary
Ampholyte polymeric compound that comprises at least one nonionic monomer, at least one sulfonic acid-containing monomer, and at least one cationic monomer may be useful in viscosifying treatment fluids for use in subterranean operations at a concentration of about 0.5 v/v % to about 30 v/v % of the treatment fluid. Such operations may involve introducing the treatment fluid into a wellbore penetrating a subterranean formation optionally at a pressure sufficient to create or extend at least one fracture in the subterranean formation.