METHOD FOR TREATING BOTTOMHOLE AND REMOTE ZONES OF OIL AND GAS BEARING FORMATION Russian patent published in 2024 - IPC E21B43/267 E21B43/24 E21B43/27 C09K8/66 C09K8/592 C09K8/74 

FIELD: oil and gas industry.

SUBSTANCE: method of treating the bottomhole and remote zones of an oil and gas bearing formation, according to the first option, hydraulic fracturing of the formation is carried out, a sand-bearing fluid on a water or hydrocarbon basis - an aqueous gel or an inverse hydrocarbon microemulsion - with proppant containing magnesium pellets with a grain size of up to 1 mm as granulated magnesium is pumped into the formed crack, and, additionally, granulated ammonium nitrate and urea when using an aqueous gel or granulated ammonium nitrate when using reverse hydrocarbon microemulsion, alternating with injection of sand-carrying fluid with proppant only in order to avoid high wellhead pressures at the well, forming thermal gas-generating portions - thermal gas-generating backfills in the amount of 2-3 at the end of the fracture away from the well and at half the length of the fracture. After completing the installation of the last thermal gas-generating backfill at a distance of 5-10 m from the bottom of the well, a sand-carrying fluid with proppant only is pumped into the crack, then a technological holding period of 8-10 hours is carried out to close the crack. After that, a 12-15% aqueous solution of hydrochloric acid with an initiator - copper sulphate CuSO₄ or ferric chloride FeCl₃, which starts the process of thermogas chemical reaction in a limited volume of rock, is pumped into the well. In the method according to the second option, hydraulic fracturing of the formation is carried out, a portion of proppant with magnesium is placed in a fracture zone remote from the well, then a thermal gas-generating composition - an aqueous solution of ammonium nitrate and urea or the reverse - is pumped into the formation in a volume sufficient to fill the entire volume of the opened and fixed fracture. an emulsion based on an aqueous solution of ammonium nitrate and oil, after which a 12-15% aqueous solution of hydrochloric acid is pumped in with an initiator - copper sulphate CuSO₄ or ferric chloride FeCl₃, which starts the thermogas-chemical reaction process along the entire length of the crack.

EFFECT: increased permeability of the bottom-hole zone, increased well flow rate, and increased oil recovery from the productive formation during oil and gas production.

2 cl, 4 tbl