http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110950785-B

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filingDate 2019-11-26-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 2021-10-01-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationDate 2021-10-01-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber CN-110950785-B
titleOfInvention Twin-tail hook type viscoelastic surfactant gel, preparation method thereof and gel removing method
abstract The invention discloses a twin-tailed hook type viscoelastic surfactant gel, a preparation method thereof and a gel removing method, wherein the preparation and gel breaking method comprises the following steps: 1) mixing linolenic acid, N-dimethyl-1, 3-propanediamine and a catalyst, heating to 130-150 ℃ under the protection of nitrogen, and carrying out vacuum pumping under reduced pressure to obtain an intermediate; 2) adding sulfonate and a first solvent into the intermediate, and reacting at the temperature of 60-80 ℃ under the protection of nitrogen to obtain a crude product; 3) vacuum drying the crude product, dissolving with ethanol, adding petroleum ether, stirring, removing petroleum ether phase, and removing ethanol to obtain product I; 4) adding a catalyst and a second solvent into the product I, dropwise adding diisocyanate, reacting at the temperature of 40-60 ℃, and performing vacuum drying to obtain a product II; 5) and preparing the product II into a fracturing fluid. The twin-tail hook type viscoelastic surfactant gel solves the problem of incomplete self-gel breaking of a clean fracturing fluid stratum when meeting oil, and the gel breaking theory is novel.
priorityDate 2019-11-26-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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