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Starlike anti-shearing polyacrylamide for fracturing fluid and preparation method of starlike anti-shearing polyacrylamide

A technology of polyacrylamide and acrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effects of mild conditions, excellent temperature resistance and strong operability

Active Publication Date: 2015-04-08
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on star polymers used as thickeners in fracturing fluids, but it is believed that the excellent shear resistance of star polymers can meet the shear resistance requirements of fracturing

Method used

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  • Starlike anti-shearing polyacrylamide for fracturing fluid and preparation method of starlike anti-shearing polyacrylamide
  • Starlike anti-shearing polyacrylamide for fracturing fluid and preparation method of starlike anti-shearing polyacrylamide
  • Starlike anti-shearing polyacrylamide for fracturing fluid and preparation method of starlike anti-shearing polyacrylamide

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Embodiment 1

[0044] (1) Preparation of thioxanthone-modified dendritic polyamide-amine water-soluble initiator

[0045] (a) Dissolve 0.05mol (8g) of thiosalicylic acid in 75mL of concentrated sulfuric acid, stir well for 10min, then slowly add 0.25mol (22g) of phenol, dropwise for 30min, and continue stirring at room temperature for 1h , and then heated to 80 ° C for 2 h, and then left at room temperature overnight. Add the reaction solution dropwise to 750mL boiling water, continue to boil for 30min after the addition, cool and filter to obtain the initial product, which is recrystallized in a mixed solution of 1,4-dioxane / water with a volume ratio of 4:1 , to obtain 2-hydroxythioxanthone.

[0046] (b) Add 0.01mol (2.28g) of 2-hydroxythioxanthone, 5g of anhydrous potassium carbonate, and 15mL of epichlorohydrin into 20mL of toluene, react at 80°C for 12h, and then reflux at 135°C for 12h . After the reaction, use a rotary evaporator to remove excess epichlorohydrin and solvent, dissolv...

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Abstract

The invention discloses starlike anti-shearing polyacrylamide for a fracturing fluid and a preparation method of the starlike anti-shearing polyacrylamide. The core of the polymer is a thioxanthone modified dendriform polyamide-amine water soluble initiator and the arm of the polymer is a propenamide homopolymer and an acrylamide bipolymer or terpolymer. The preparation method comprises the following steps: modifying a dendriform macromolecule polyamide-amine in chloroform by using 2-epoxy thioxanthone so as to obtain a dendriform multifunctional macromolecular initiator; and initiating monomer polymerization of acrylamide and the like by taking the dendriform multifunctional macromolecular initiator as an initial starting core in an aqueous solution so as to prepare anti-shearing polyacrylamide. The starlike polymer which serves as a thickener is used for the fracturing fluid, is excellent in temperature-resisting and anti-shearing performances and free of residues after gel breaking and provides a powerful guarantee for wide application of fracturing construction operation in oil and gas fields. The preparation method is reliable in principle, strong in operability, mild in condition and relatively high in yield and has a broad market prospect.

Description

technical field [0001] The invention relates to star-shaped shear-resistant polyacrylamide used as a thickener for fracturing fluid in the field of oil and gas field exploitation and a preparation method thereof. Background technique [0002] With the development of polymer science and technology, especially the deepening understanding of the relationship between polymer structure and performance, various fields pay more and more attention to the research and development of highly branched polymers. The tree-core star polymer formed by connecting multiple linear polymer branches on the periphery of the dendrimer has attracted widespread attention for its unique structure and properties. The synthesis of dendritic star-shaped polymers can use a dendritic polyfunctional initiator as the central core, and then initiate the polymerization of vinyl monomers. Patent CN1594369 modified the dendritic macromolecule polypropylene imine to obtain dendritic thioxanthone photoinitiator,...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/56C08F220/58C08F220/34C08F2/48C08G83/00C09K8/68
Inventor 赵星彭欢郭建春李一波袁成东
Owner SOUTHWEST PETROLEUM UNIV
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