HYDRAULIC FRACTURING FLUID BASED ON SYNTHETIC GELLING AGENT AND SURFACE WATER, METHOD OF ITS PREPARATION AND METHOD OF TREATING FORMATION USING SAID FLUID Russian patent published in 2024 - IPC C09K8/68 E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to production using hydraulic fracturing technology of productive oil formations. Method of hydraulic fracturing using a liquid for hydraulic fracturing based on a synthetic gelling agent—anionic water-soluble polymer of polyacrylamide and surface water, hydraulic fracturing fluid contains polyacrylamide hydrolysed with 2-ethylhexylacrylate—polyprop-2-enamide hydrolysed with 2-ethylhexylprop-2-enoate. Fluid is prepared for hydraulic fracturing in hydration unit—blender. First, said water is dosed into the blender vessel in amount of 88.0 to 95.0 wt.%, the mixer is switched on with revolutions from 1,000 to 1,700 rpm and demulsifier is introduced in amount of 1.0 wt.% with constant stirring. Then, using a screw dispenser, said gelling agent is poured into the blender in an amount of approximately 3.0 to 10 wt.%, stirring until complete hydration of said gelling agent. Proppant in amount of 700 kg per 1 m³ of polymer liquid is discharged into the obtained polymer liquid—aqueous polymer solution. Then a polymer destructor is added through the same screw feeder in amount of 1.0 wt.%, the obtained mass is stirred until a homogeneous suspension is obtained. Further, the fluid for hydraulic fracturing from the blender enters the productive formation, performing hydraulic fracturing of the formation.

EFFECT: reduced time of operations, reduced impact on environment, uniform distribution of injected fluid along the whole length of fracture created during hydraulic fracturing, deeper penetration of proppant particles.

7 cl, 10 dwg, 1 tbl, 3 ex