TREATMENT METHOD OF BOTTOM-HOLE ZONE FOR HIGH-VISCOUS OIL FORMATION WITH COMBUSTIBLE OXIDATION COMPOUND Russian patent published in 2015 - IPC E21B43/263 E21B36/02 

FIELD: oil and gas industry.

SUBSTANCE: method includes running in tubing to the well, injecting combustible and oxidizing composition (COC) to the tubing, running in ignition source at a cable to the tubing to COC interval, delivering control signal to the cable and igniting COC. At the wellhead bottom of the tubing string is equipped with a combustion chamber with burner. At that upstream the combustion chamber the tubing string is equipped with a packer, run in the tubing string to the well so that the packer is set at distance of 30 m above the formation roof. Thereafter through the tubing string at electrical cable combined with fibre-optic cable the ignition source is run in up till it contacts the burner, then injection of COC is started to the tubing string with permanent rate. At that COC of the following composition is used in wt %: ammonium nitrate - 45.5; 2% aqueous solution of polyacrylamide - 19.5; potassium bichromate - 5; ethylene glycol - 30. When COC reaches the burner of combustion chamber the electric igniter is actuated by control signal sent to the electric cable, COC ignition takes place in the burner of combustion chamber. Ignition and commencement of COC combustion in the combustion chamber is monitored. Thereupon the electric cable combined with fibre-optic cable is removed from the tubing string, the packer is set in the well, COC combustion and heating of high-viscous oil is continued till viscosity decreases up to the value sufficient for product extraction with pump equipment.

EFFECT: improved efficiency in heating of high-viscous oil formation and reliability of the method implementation.

2 dwg