Acrylamide Polymer Emulsion Friction Reducer for High-Salinity Hydraulic Fracturing
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Solution Overview
Problem
Conventional friction reducers used in hydraulic fracturing are less effective in high-salinity environments, leading to increased costs and reduced performance, particularly with produced water containing high concentrations of monovalent and divalent cations.
Innovation Solution
A composition comprising an acrylamide polymer emulsion and a nonionic surfactant, such as aralkylated phenol ethoxylates or C12-C22 amine ethoxylates, is used to enhance friction reduction, allowing for effective operation in high-salinity conditions without the need for expensive salt-tolerant friction reducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional friction reducers (HPAM) are used in high-salinity environments, then cost is reduced, but friction reduction performance deteriorates
Solution Approach 1:
The patent introduces an inverting surfactant as an intermediary substance that mediates between the conventional friction reducer and the high-salinity environment. The surfactant enables the conventional polymer to maintain its friction reduction performance in produced water with high TDS by facilitating emulsion inversion and polymer release, thus protecting the system from the harmful effects of high salinity without requiring expensive salt-tolerant alternatives
Solution Approach 2:
The patent creates a composite system combining conventional acrylamide polymer friction reducer with inverting surfactant. This composite approach allows the use of cost-effective conventional materials while achieving salt-tolerant performance through the synergistic interaction between the polymer and surfactant, resolving the contradiction between cost and performance in high-salinity conditions
2Reliability
If salt-tolerant friction reducers are used to handle produced water, then friction reduction performance in high salinity is improved, but cost increases
Solution Approach 1:
The patent employs inexpensive conventional acrylamide polymer friction reducers combined with a small amount of inverting surfactant, replacing expensive salt-tolerant friction reducers. This approach uses cost-effective materials that achieve the desired performance temporarily through emulsion inversion, eliminating the need for costly specialized polymers while maintaining friction reduction effectiveness in high-salinity produced water
Solution Approach 2:
The patent changes the physical state and distribution parameters of the friction reducer by using emulsion form and controlling inversion timing. By adjusting emulsion composition and inversion conditions rather than changing to expensive salt-tolerant chemistry, the system achieves cost-effective salt tolerance through parameter optimization rather than material substitution
3Quantity of substance
If produced water with high TDS is used for hydraulic fracturing, then fresh water demand is reduced, but friction reducer effectiveness deteriorates
Solution Approach 1:
The inverting surfactant acts as an intermediary that enables produced water with high TDS to be effectively used in hydraulic fracturing. By mediating the interaction between conventional friction reducers and high-salinity produced water, the surfactant allows up to 300,000 ppm TDS produced water to be utilized while maintaining friction reduction effectiveness, thus reducing fresh water demand without sacrificing 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 combination of acrylamide polymer emulsions with nonionic surfactants significantly boosts friction reduction, often exceeding the performance of more expensive salt-tolerant alternatives, enabling the use of more produced water and reducing fresh water demand while maintaining efficiency in high-salinity environments.
Implementation Method 1
A small proportion of certain nonionic surfactants can improve the performance of acrylamide polymer emulsions in reducing fluid friction in hydraulic fracturing applications
Implementation Method 2
Friction reducers are introduced either as aqueous solutions or, more often, as water-in-oil emulsions
Data Source
AI summary
Compositions comprising an acrylamide polymer emulsion and a nonionic surfactant suitable for use as friction reducers for hydraulic fracturing are disclosed. The nonionic surfactants include aralkylated phenol ethoxylates, amine ethoxylates, amidoamine ethoxylates, linear or branched alcohol EO/PO alkoxylates, ethoxylated alcohols, alkylphenol ethoxylates, and EO-capped poly(oxypropylene) block copolymers. Improved hydraulic fracturing processes in which an acrylamide polymer emulsion is used as a friction reducer are also described. In these processes, the surfactant is included in the composition with the acrylamide polymer friction reducer, or it is introduced separately into the process. The performance of low-cost polyacrylamide friction reducers can be boosted with a small proportion of certain readily available nonionic surfactants. The inventive compositions are effective in high-salinity environments, and their performance can sometimes exceed that of more-expensive salt-tolerant friction reducers, thereby reducing fresh water demand and enabling greater utilization of produced water.