THERMODYNAMIC METHOD OF ACTION ON WELL BOTTOMHOLE ZONE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC E21B43/24 E21B36/04 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and, in particular, to thermal treatment of bottomhole zone. According to the method, the downhole motor, multiplier, synchronous electric current generator and heating element installed in the well heating interval are installed on the pipe string in the well. Fluid is pumped through hydraulic downhole motor. Fluid flow energy is converted when liquid flows in internal cavities of hydraulic downhole motor with outlet outside through its flushing openings into mechanical energy of rotation of its rotor. Rotation speed is varied by means of a multiplier. Rotational energy is transmitted to rotor of synchronous generator. By means of it electric current is generated and heat energy is generated by means of heating element. Prior to lowering into the well, the multiplier and the synchronous electric current generator are equipped with a casing with flushing openings communicated with the output of the hydraulic downhole motor. Fluid outflow from the downhole hydraulic motor is enabled to rotate. Flushing holes are located from below the casing. Below the flushing openings of the casing there is a packer from the outside. It is installed above payout bed. Heating element is made as flowing. Its inner cavity is connected with casing. Casing flushing windows are equipped with electromagnetic valves. By means of these valves flushing openings of casing are opened at generation of electric power by synchronous generator and liquid is passed in sufficient amount for normal operation of hydraulic downhole motor, cooling synchronous electric current generator and creation of pressure drop, sufficient for pouring of heated liquid from cavity of flow heater into productive formation.

EFFECT: higher efficiency of oil production.

3 cl, 1 dwg