THERMOGAS-CHEMICAL COMPOSITION AND METHOD OF ITS APPLICATION IN THE TREATMENT OF BOTTOM-HOLE AND REMOTE ZONES OF THE PRODUCTIVE FORMATION (EMBODIMENTS) Russian patent published in 2023 - IPC C09K8/592 E21B43/24 

FIELD: oil industry.

SUBSTANCE: claimed group of inventions relates to the treatment of bottomhole and remote zones of the productive formation. Thermal gas chemical composition is produced by successive injection into the reservoir of components of the thermal gas chemical composition, an aqueous solution containing, wt.%: ammonium nitrate 34; sodium nitrite 16; potassium nitrite 16; thermosalt-resistant nonionic surfactants 1; water 33 and the reaction initiator or components of the reaction initiator. In the method of treating a productive formation, the reaction initiator is first pumped – a 30% solution of acetic acid or technical formalin of the FM brand – an aqueous solution containing 37 wt.% formaldehyde, then a buffer liquid is pumped in an amount of 0.5m³, inert with respect to the components thermal gas-chemical composition, then the above aqueous solution containing ammonium nitrate is pumped, with a volume ratio of the specified reaction initiator and the specified aqueous solution of 1:5. According to the second embodiment of the method, the reaction initiator is first pumped – a mixture of the specified technical formalin of the FM brand and a 37% hydrogen peroxide solution at a volume ratio of 1:2, then a buffer liquid is pumped in an amount of 0.5 m³, then the above aqueous solution containing ammonium nitrate is pumped, at a volume ratio of the specified reaction initiator and the specified aqueous solution of 1:6. According to the third embodiment of the method, the components of the reaction initiator are first pumped sequentially – a 37% hydrogen peroxide solution and technical formalin of the FM brand at a volume ratio of the specified formalin to the specified hydrogen peroxide solution of 1: 2, which form a mixture in the reservoir – the reaction initiator, then the buffer liquid is pumped in an amount 0.5 m³, then the above aqueous solution containing ammonium nitrate is pumped, with a volume ratio of the specified reaction initiator and the specified aqueous solution of 1:6. According to the fourth embodiment of the method, the rims of the components of the reaction initiator – a 37% solution of hydrogen peroxide and technical formalin of the FM brand are first pumped in succession, then buffer liquid is pumped in an amount of 0.5 m³, then the above aqueous solution containing ammonium nitrate is pumped, then buffer liquid in the amount of 0.5 m³, then a 37% hydrogen peroxide solution is pumped, then technical formalin of the FM brand is pumped, and the volume ratio of the components pumped in series is the specified hydrogen peroxide solution : formalin: the specified aqueous solution containing ammonium nitrate, nitrites sodium potassium and thermosalt-resistant non-ionic surfactants : the specified solution of hydrogen peroxide : formalin is 1:1:6:2:1.

EFFECT: directed thermal gas chemical impact on oil-saturated interlayers, increased coverage of the productive formation by thermal gas chemical impact, safety.

6 cl, 8 dwg, 4 tbl