Hydrolyzed Polyacrylamide Friction Reducer for Wellbore Servicing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional well servicing fluids face issues such as polymer cake residue damage, incompatibility with saltwater, and high friction at high pump rates, which can lead to formation damage and equipment erosion during hydraulic fracturing.
Innovation Solution
A well servicing fluid formulated with a friction reducer comprising polymer units like acrylamide, acrylate, and maleic acid groups, combined with anionic and cationic surfactants, capable of forming a viscoelastic gel, which reduces friction and is compatible with brines and produced water, thereby minimizing erosion and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polyacrylamide emulsion friction reducers are used in slickwater fracturing fluids, then friction is reduced at high pump rates, but polymer cake residue builds up that damages well formations
Solution Approach 1:
The patent changes the chemical parameters of the friction reducer by using hydrolyzed polyacrylamide with controlled degrees of hydrolysis (20-80%) and specific molecular weights (500,000 to 5,000,000 Daltons), which reduces friction effectiveness while minimizing polymer cake residue buildup that damages formations
Solution Approach 2:
The patent creates a composite friction reduction system by combining hydrolyzed polyacrylamide with specific surfactants (anionic, cationic, or nonionic) and optional clay materials, where the composite formulation achieves friction reduction without the harmful polymer cake residue of conventional emulsions
2Object-generated harmful factors
If breakers are added to slick water fracturing fluids to reduce polymer chain size, then fracture and formation damage is reduced, but friction reduction effectiveness is compromised
Solution Approach 1:
Instead of using breakers to reduce polymer chain size, the patent achieves formation damage reduction by selecting hydrolyzed polyacrylamide with controlled molecular weights (500,000 to 5,000,000 Daltons) and degrees of hydrolysis (20-80%), which provides adequate friction reduction while minimizing polymer cake residue without requiring breakers
3Object-generated harmful factors
If viscoelastic surfactant gels are used as fracturing fluids, then formation damage is minimized, but friction is not reduced at high pump rates due to micellar structure disruption
Solution Approach 1:
The patent creates a composite formulation combining hydrolyzed polyacrylamide friction reducer with surfactants (anionic, cationic, or nonionic) at specific concentrations, where the polyacrylamide provides friction reduction while the surfactant system maintains viscoelastic gel properties and minimizes formation damage, achieving both goals simultaneously
4Object-affected harmful factors
If conventional polyacrylamide friction reducers are added to cold water fracturing fluids, then friction reduction is achieved, but extended hydration time is required or additional surfactants and heat are needed
Solution Approach 1:
The patent modifies the polyacrylamide structure by introducing hydrolysis (20-80% degree of hydrolysis) which creates carboxylate groups that enhance water compatibility and reduce hydration time in cold water, eliminating the need for additional surfactants or heat treatment
Solution Approach 2:
The patent introduces polar carboxylate groups at specific locations along the polyacrylamide chain through hydrolysis, which create local hydrophilic zones that accelerate water penetration and hydration while maintaining the overall molecular structure for friction reduction
5Object-affected harmful factors
If conventional polyacrylamide friction reducers are used with salt water or produced water, then friction reduction may be achieved, but incompatibility issues arise due to high concentrations of total dissolved solids
Solution Approach 1:
The patent changes the chemical composition of the polyacrylamide by hydrolyzing it to create charged carboxylate groups (20-80% degree of hydrolysis), which improve compatibility with salt water and produced water by reducing polymer-salt interactions that cause precipitation and loss of friction reduction effectiveness
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 solution effectively reduces friction, minimizes the amount of friction reducer needed, maintains desired viscosity, and ensures compatibility with various water types, reducing formation damage and equipment wear.
Implementation Method 1
an anionic surfactant, a cationic surfactant and an aqueous base capable of forming a viscoelastic gel
Implementation Method 2
capable of forming a viscoelastic gel
Implementation Method 3
friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups
Data Source
AI summary
A well may be serviced with a fluid formulated with components comprising a friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups; and an anionic surfactant, a cationic surfactant and an aqueous base capable of forming a viscoelastic gel.