METHOD OF CROSSLINKED GEL DESTRUCTION IN WORKING LIQUID FOR OIL PRODUCING WELL TREATMENT Russian patent published in 2017 - IPC C09K8/86 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to compositions providing the destruction of highly viscous, water-based fluids used in formation hydraulic fracturing. In a method of crosslinked gel destruction in working liquid for oil producing well treatment by means of radical depolymerization, the destruction of the crosslinked gel is carried out by introducing into the liquid which is an aqueous solution comprising at least one hydrophilic polymer as a gelting agent, of a destructive agent - organic peroxide together with an activator - potassium hexacyanoferrate or iron complex with ethylenediaminetetraacetate, then - at least one crosslinker for a hydrophilic polymer, by heating with subsequent aging until the end of the radical destruction of the resulting crosslinked gel at the following concentration of the noted components in an aqueous solution, wt %: organic peroxide (by active substance) 0.005-5, the noted activator (by active substance) 2.5⋅10^-6 - 2.5⋅10^-2, the gelling agent 0.08-5.

EFFECT: ensured timing complete destruction control of the water-based crosslinked gel used in the hydraulic fracturing of the formation, simultaneously requiring no process of change and additional adjustment formation hydraulic fracturing fluid composition formulation.

8 tbl