METHOD FOR THERMAL OIL RESERVOIR TREATMENT Russian patent published in 2007 - IPC E21B43/24 

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons with the use of heat.

SUBSTANCE: method involves heating water to be injected in injection well and heating oil to be produced via producing well along with prevention of heat losses along well bore. Water is injected by throttling and cavitation of pressure created by centrifugal pumps in reservoir pressure maintenance system directly in zone of water injection in reservoir. Produced oil is heated by means of well pump in oil production system nearer to perforation zone. Heat generator made as jet pump and insert placed in flow strings of injection and producing wells is used. The insert includes inner and other pipes, which define cavity in-between. Inner pipe is perforated along length thereof and is adapted to circulate main flow. Flow swirlers providing heat generation are installed in said cavity. Jet pump is arranged in injection well in lower heat generator part and in producing well in upper heat generator part.

EFFECT: increased oil recovery and extended well flowing period.