Beta-CD Star Polymer for Shear and Temperature Resistance
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Solution Overview
Problem
Current hydrophobic associative polymers used in oilfield hydraulic fracturing are sensitive to temperature and pH, have poor shear resistance, and limited tackifying performance, making them unsuitable for harsh reservoir conditions.
Innovation Solution
A supramolecular star-shaped polymer with β-cyclodextrin as the core, grafted with acrylamide, acrylic acid, hydrophobic monomers, and surface-active macromolecular monomers, forming a β-cyclodextrin-modified branched monomer that enhances temperature, salt, and shear resistance, and improves tackifying performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linear chain structure hydrophobic associative polymer is used, then the polymer is easy to synthesize and process, but under high-speed shear the molecular chain structure is unstable and viscosity drops sharply
Solution Approach 1:
The polymer structure is segmented into a linear backbone and multiple branched chains, where the linear backbone provides synthesis ease while the branched chains provide shear resistance. This segmentation allows each structural component to fulfill its specific function independently.
Solution Approach 2:
The invention creates a composite polymer structure combining linear chain characteristics with hyperbranched polymer characteristics. The linear backbone maintains ease of synthesis and processing, while the grafted hyperbranched chains provide enhanced shear resistance and structural stability under high-speed shear conditions.
2Reliability
If styrene-typed hydrophobic monomer with rigid benzene ring is used, then temperature resistance and hydrolysis resistance are improved, but copolymerization with acrylamide is hindered and tackifying performance is not improved
Solution Approach 1:
The benzene ring is positioned at the terminal position of the branched chain rather than being directly attached to the main backbone. This local quality adjustment allows the benzene ring to provide temperature and hydrolysis resistance without interfering with the copolymerization reaction at the backbone level.
Solution Approach 2:
The hydrophobic monomer structure is extended from a simple backbone attachment to a terminal position on a branched chain, adding a dimensional aspect to the molecular architecture. This dimensional change separates the functional roles: the backbone handles polymerization while the terminal benzene ring handles thermal stability.
3Ease of manufacture
If allyl-typed hydrophobic monomer is used, then polymerization reaction is facilitated, but high molecular weight and obvious tackifying performance are not achieved
Solution Approach 1:
The allyl group is used in the preliminary stage of polymerization to facilitate chain growth and achieve high molecular weight, after which the terminal benzene ring structure provides the necessary thermal stability. This preliminary action allows the polymerization process to proceed efficiently before structural refinement.
Solution Approach 2:
The molecular weight parameter is optimized by controlling the polymerization conditions and monomer ratios, allowing the system to achieve both high molecular weight through reactive allyl groups and subsequent structural stabilization through terminal benzene rings.
4Ease of manufacture
If acrylamide-typed hydrophobic monomer is used, then copolymerization with acrylamide is facilitated, but hydrolysis resistance is poor
Solution Approach 1:
The branched chain structure acts as an intermediary between the acrylamide backbone and the hydrophobic terminal groups. This intermediary structure allows efficient copolymerization at the backbone level while protecting the hydrolysis-sensitive groups through the spatial separation and steric protection provided by the branched architecture.
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 supramolecular star-shaped polymer exhibits excellent tackifying performance, temperature resistance, and salt resistance, effectively enhancing crude oil recovery ratios and hydraulic fracturing processes.
Implementation Method 1
due to its characteristic of hydrophile exteriors and hydrophobic interiors, it can envelop and complexate hydrophobic groups to achieve copolymerization with aqueous solution of hydrophobic monomers
Implementation Method 2
A hydrophobic associative polymer (HAP) refers to a water-soluble polymer that introduces a small amount of hydrophobic groups
Data Source
AI summary
A supramolecular star-shaped polymer with β-CD as a core and a preparation method thereof. The supramolecular star-shaped polymer with β-CD as a core has a β-cyclodextrin-modified branched monomer F-β-CD that serves as a core and is grafted with acrylamide, acrylic acid, hydrophobic monomers and surface-active macromolecular monomers to form a supramolecular star-shaped polymer. The hydrophobic monomer is one or more of N-benzyl-N alkyl (meth) acrylamide and N-phenethyl-N alkyl (meth) acrylamide; the surface-active macromolecular monomer is one or more of allyl polyoxyethylene ether, alkylphenol polyoxyethylene ether (meth)acrylate, allyl alkylphenol polyoxyethylene ether, alkyl alcohol polyoxyethylene ether (meth)acrylate and allyl alkyl alcohol polyoxyethylene ether. The method has cheapness and easiness to obtain raw materials, ease to control synthesis conditions, and high yield. The present invention has excellent tackifying performance, temperature resistance, salt resistance and hydrolysis resistance, so that it shows good application prospects in the aspect of enhancing recovery ratios and hydraulic fracturing in oilfields.