ENCAPSULATED DESTRUCTOR BASED ON AMMONIUM PERSULFATE AND METHOD FOR ITS PRODUCTION IN FLUIDIZED BED WITH SLOW RELEASE Russian patent published in 2023 - IPC C09K8/92 B01J8/24 B01J2/00 E21B43/26 

FIELD: hydraulic fracturing.

SUBSTANCE: group of inventions can be used in the technology of hydraulic fracturing of underground formations during oil production. A method has been proposed for producing encapsulated destructors based on ammonium persulfate, which includes obtaining ammonium persulfate in the form of dry round granules with a size of 300 to 900 microns by granulating them in a fluidized bed using the original ammonium persulfate with a fraction of 200-400 microns or potassium persulfate as “seeds”, rubbed through a 400 micron mesh. A 37-42% ammonium persulfate solution is applied to the “seeds” loaded into the fluidized bed through a pneumatic nozzle, after which the granules grow. The temperature in the fluidized bed is 38-48°C. Aqueous solutions of a mixture of acrylic polymers are also applied to the resulting ammonium persulfate granules loaded into a fluidized bed through a pneumatic nozzle with simultaneous film formation and drying. The concentration of polymers in water when applying encapsulating shells is 14-21% dry. An encapsulated destructor based on ammonium persulfate is also proposed.

EFFECT: group of inventions makes it possible to obtain an encapsulated destructor based on ammonium persulfate with a delayed release of ammonium persulfate.

4 cl, 3 dwg, 2 ex