HYDRAULIC FRACTURING FLUID BASED ON A SYNTHETIC GELATINISING AGENT AND HIGHLY MINERALISED WATER, METHOD FOR PREPARATION THEREOF, AND METHOD FOR TREATMENT OF THE FORMATION USING SAID FLUID Russian patent published in 2021 - IPC E21B43/26 C09K8/62 

FIELD: petroleum industry.

SUBSTANCE: proposed group of inventions relates to the field of petroleum and gas production, in particular to, technological compositions used to increase the permeability of productive formations by means of hydraulic fracturing (HF), and can be used to prepare a hydraulic fracturing fluid using alternative water sources, such as, e.g., mineralised bottom water, mixtures of bottom and fresh water, formation water. The hydraulic fracturing fluid based on a synthetic gelatinising agent and highly mineralised water includes a synthetic gelatinising agent, a deemulsifying agent, a destructor. The content of the components is, wt.%: synthetic gelatinising agent 0.5 to 0.8; deemulsifying agent 0.1 to 0.2, destructor 0.05 to 0.12; highly mineralized water the rest. The method preparing the hydraulic fracturing fluid based on a synthetic gelatinising agent and highly mineralised water consists in the fact that, while mixing, a deemulsifying agent is added to the highly mineralised water, followed by a synthetic gelatinising agent, the gelatinising agent is hydrated, a destructor is introduced into the resulting gel. A method for treatment of the formation using the hydraulic fracturing fluid based on a synthetic gelatinising agent and highly mineralised water, including adding a proppant to the above hydraulic fracturing fluid and conducting hydraulic fracturing.

EFFECT: simultaneous preservation of the viscosity optimal for transporting the proppant (no less than 30 cP at a shear velocity of 100 s^-1) during HF operations within the time required for HF (no less than 60 minutes, preferably 100 to 110 minutes) at a temperature of up to and including 90°C and with subsequent decomposition of the HF fluid (reduction in the viscosity) for 160 minutes.

30 cl, 11 dwg, 2 tbl