METHOD FOR THERMAL ACTION ON FORMATION Russian patent published in 2017 - IPC E21B43/24 E21B7/04 

FIELD: mining.

SUBSTANCE: method of thermal action on formation contains studying of the formation physical parameters, determining in-situ pressure of the formation and the fracturing pressure in the formation header, construction in a horizontally directed well barrel, containing a sealed heater filled with coolant in a heat exchanger form, and the liquid heating in the well barrel is carried out via pumping of a coolant preheated on the surface of the coolant. When heating the formation in the well, the pressure is maintained not less than the level of the initial formation pressure and not exceeding the pressure forming fractions in the header due to withdrawal of gas and liquid from the lower level of the well. The directional barrel is constructed upward to the bottom hole with a slope, excluding the downward to the bottom sections and consist of two parts. The first part the closest to the mouth, are built at the angle not exceeding 30° relatively to the horizon, and is equipped with a heater, which does not reach the end of the first part from 1/4 upto 3/4 of its length. The second part at the bottom hole is built with an angle of 40-90° relatively to the horizon.

EFFECT: restoration of the hydraulic connection of the formation with the well, increase in oil recovery from heavy oil formations and well capacity, ability to restart the operation of unprofitable oil, natural gas, fresh, mineral and thermal waters wells.

3 cl, 2 dwg