PROCEDURE FOR THERMO-CHEMICAL TREATMENT OF OIL FORMATION Russian patent published in 2010 - IPC E21B43/22 E21B43/24 C09K8/524 

FIELD: oil and gas production.

SUBSTANCE: procedure for thermo-chemical treatment of oil formation consists in separate pumping components of combustible-oxidising composition COC and originator of combustion OC via two oil-well tubing OWT arranged coaxially relative to each other. Also an end of an external OWT is lowered below the end of the internal OWT at distance sufficient for time of contact of COC and OC in a reaction volume. COC is supplied into a treated zone of the oil formation via annular space between external and internal OWT. OC is supplied via an internal OWT. COC corresponds to a water solution with hydrogen index pH 4-7 including wt %: nitre 5-25, carbamide-urea mixture CUM - 32 the rest, CO - water solution with pH 12 - 14 including wt %: alkali metal nitrite 15- 45, water - the rest or boron hydride of alkali metal 15-45, alkali 3 - 45, water - the rest. Notably, weight of CO containing nitrite of alkali metal is 1-80 % of weight COC, and weight of CO containing boron hydride of alkali is 1-30 % of COC weight.

EFFECT: reduced explosion hazard of process, increased efficiency of oil yield stimulation, and expanded heated zone of formation due to reduced time for introduction of big amount of heat into formation.

5 cl, 2 tbl