METHOD FOR FORMATION TREATMENT WITH COMBUSTIBLE AND OXIDISING COMPOSITION 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 oxidising 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 part of the tubing is equipped with a combustion chamber and burned faced outside, and to the upper end of the burner a thermocouple is fixed with an extension cord. At the wellhead the upper end of the extension cord is fixed to a device measuring temperature. Thereafter source of ignition, which is an electric flame igniter, is run in into tubing-casing annulus up to openings in the burner. Then from the wellhead permanent injection of COC is started to the tubing by means of a pump. At that COC of the following composition is used in wt %: ammonium nitrate - 65.8%; 2% aqueous solution of polyacrylamide - 28.2%; potassium bichromate - 1%; ethylene glycol - 5%. When COC reaches openings of the burner the electric flame igniter is actuated by delivery of control signal to the cable, COC is ignited. The cable with electric flame igniter is removed from the tubing, burning temperature is controlled in the interval of formation treatment by the device measuring temperature. When burning temperature is increased within the interval of treated formation above the permitted value COC delivery to the tubing is reduced, and when burning temperature is decreased within the interval of treated formation below the permitted value COC delivery to the tubing is increased.

EFFECT: increased reliability and quality of formation treatment.

2 dwg