DEVICE FOR HEAT WELL BOTTOM ZONE TREATMENT Russian patent published in 2006 - IPC E21B36/04 E21B43/24 

FIELD: mining, particularly to perform heat treatment of highly-viscous oil reservoir, to recover hydraulic communication between reservoir and well and to repeatedly operate noncommercial producers for oil, natural gas, fresh, mineral or thermal water production.

SUBSTANCE: device comprises heater body, power supply cord connected to central tubular current conductor, perforated disc electrodes installed on central current conductor and isolated from heated body filled with current-conductive fluid, water supply system, tubing string connected to water supply pipe, to pump having adjustable drive and to water vessel. The water supply system includes valves and orifices made in additional body coaxial with heater body. The device also has heat-resistance packer installed over additional body and voltage regulator. The device is provided with distribution means arranged below tubing string. Inner distribution means cavity is filled with dielectric liquid. Connection unit, which joints tubing string with dielectric insert and with adapter having orifice coaxial to tubular insert orifice, is axially aligned with distribution means. Upper part of central tubular current conductor is connected with power supply cord strands by means of above adapter. Heater body is connected to earthed neutral of supply transformer through additional body, intermediate adapter and distribution means. Central tubular current conductor having heat-resistant isolation means is fixedly connected to all disc electrodes isolated from heater body by heat-resistant isolation means provided with orifices located in areas between electrodes. Outlet valves and outlet orifices are created in additional body.

EFFECT: increased oil recovery from reservoir due to increased dry steam heat transfer into well bottom zone, reduced heat losses and simplified structure.

3 dwg