METHOD FOR INITIATION AND CONTROL OF EXOTHERMAL REACTION OF THERMAL GAS-CHEMICAL ACTION ON FORMATION IN WELL Russian patent published in 2016 - IPC E21B43/24 E21B43/18 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and, in particular, to thermochemical treatment of productive formation for reducing oil viscosity and increasing well productivity. Method comprises, mounting equipment is in a well for pumping chemical components of energy-releasing mixtures. Tubing is lowered into well with a pump and high-temperature system with pressure sensors and temperature for controlling chemical reaction processes in real time. Temperature and pressure sensors are placed at a distance, for example, 100-150 meters from bottom-hole zone. Second temperature sensor is placed directly in reaction zone. Chemical components of energy-releasing mixtures are pumped through tubing for excitation of exothermic reaction. After pumping reagents, method includes pumping out reaction products by creating depression in well shaft. Simultaneously with pumping out reaction products from formation, its temperature is measured by second temperature sensor. At considerable temperature change, for example by 5 °C per 1 m³ of pumped liquid, additional pumped chemical components of energy-releasing mixtures are pumped. After that depression is created again in well shaft and reaction products are pumped out from formation. Pumping in and out is performed periodically in accordance with readings of first and second temperature sensors. Insignificant change in temperature of exothermal reaction, for example, reduction thereof by 1 °C per 1 m³ of pumped liquid, indicates expected space of formation is covered by exothermic reaction. Operation is finished with pumping out reaction products in an amount, equal pumped volume of chemical components of energy-releasing mixtures.

EFFECT: technical result is higher efficiency due to possibility of heating formation, adjacent to well at a distance, and monitoring of heating.

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