Slick Water Friction Reducer for High Salinity Drag Reduction
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Solution Overview
Problem
Existing slick water fracturing systems face challenges in achieving significant drag reduction in high salinity and low temperature environments, despite previous approaches such as reducing total dissolved solids or using salt-resistant friction reducers.
Innovation Solution
Incorporating a partially hydrolyzed polyacrylamide polymer system within an inverted emulsion and an effective amount of a quaternary salt-based friction reducer booster system to reduce drag friction by an additional 5% to 12% in the first 30 seconds of evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional friction reducers are used in high salinity environments, then drag reduction is achieved, but effectiveness significantly decreases in high salinity and low temperature conditions
Solution Approach 1:
The patent changes the chemical parameters of the friction reducer by using partially hydrolyzed polyacrylamide with specific hydrolysis degrees (20-50%) and incorporating quaternary salts with specific concentrations (0.1-5.0 gpt). This chemical parameter modification enables the friction reducer to maintain effectiveness in high salinity (up to 200,000 ppm TDS) and low temperature (0-100°F) environments where traditional friction reducers fail.
Solution Approach 2:
The patent creates a composite friction reducer system by combining partially hydrolyzed polyacrylamide polymer with quaternary salts (such as alkyl dimethyl benzyl ammonium chloride or alkyl trimethyl ammonium chloride). This composite approach synergistically enhances drag reduction performance in challenging environmental conditions, achieving up to 50% additional drag reduction compared to traditional friction reducers alone.
2Reliability
If terpolymers are used to achieve salt resistance, then drag reduction in high salinity is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive terpolymer friction reducers with a more economical combination of partially hydrolyzed polyacrylamide and quaternary salts. This cost-effective alternative achieves comparable or superior drag reduction performance in high salinity environments without the high manufacturing costs associated with terpolymer synthesis, making it economically viable for large-scale fracturing operations.
Solution Approach 2:
Instead of using complex terpolymer chemistry, the patent modifies the parameters of simpler, cheaper materials by controlling the hydrolysis degree of polyacrylamide and optimizing quaternary salt concentrations. This parameter optimization approach achieves salt resistance at a fraction of the cost of terpolymer-based solutions.
3Reliability
If total dissolved solids are reduced by cutting brine with fresh water, then drag reduction is improved, but water consumption and operational complexity increase
Solution Approach 1:
The patent extracts the friction reduction function from the bulk water composition and concentrates it in specific additive components (partially hydrolyzed polyacrylamide and quaternary salts). This allows the friction reducer to function effectively in high TDS brine without requiring dilution with fresh water, eliminating the complexity of managing fresh water to produced water mixing ratios while maintaining superior drag reduction performance.
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 enhances drag reduction in slick water fracturing compositions, allowing for improved fracturing performance in high salinity and low temperature environments without the need for expensive terpolymers, while maintaining effectiveness over time.
Implementation Method 1
an effective amount of a friction reducer booster system, where the effective amount is sufficient to reduce a drag friction of the composition by an amount greater than about 50% in the first 30 seconds of evaluation in high salinity and low temperature environments
Implementation Method 2
a partially hydrolyzed polyacrylamide polymer system within an inverted emulsion
Data Source
AI summary
Novel slick water fracturing fluid compositions are disclosed, where the compositions including with slick water fracturing compositions including a partially hydrolyzed polyacrylamide polymer system within invert emulsion and an effective amount of a friction reducer booster system, where the effective amount is sufficient to reduce a drag friction of the composition by an additional amount of at least 5% in the first 30 seconds of evaluation in high salinity and low temperature environments.