METHOD TO BRING ABOUT THERMAL EFFECT OF FORMATION WITH HEAVY CRUDE AND DEVICE TO THIS END Russian patent published in 2010 - IPC E21B43/24 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil industry and can be used for thermal effect on face zone and oil formation, as well as for preventing wax-hydrate accumulation or heating it. Proposed method comprises lowering downhole electric heater on tubing column (TC) into formation section, warming up and extracting warmed oil from the well. Well products are additionally heated in their lifting along TC. Well warmed-up products are extracted with periodic injection of them back into formation. Injection pressure and volume, as well as the depth of warmed-up product penetration into formation is increased every period to reach maximum tolerable pressure of products injection into formation. Note here that in every period, volume of warmed-up products injected back into formation is some times smaller than that of extracted oil. Proposed device comprises downhole electric heater with current conductor arranged on TC. The latter is furnished, above downhole motor but below dynamic level of well oil, with packer tightly separating well tube space. Inlet channels are arranged below parker and above electric heater in TC, while above TC inlet channels, inserted downhole pump is mounted. Note here that column is stopped at its bottom and incorporates additional electric heaters arranged above parker and outside it. Said heaters are spaced apart to allow well products be heated and in fluid state.

EFFECT: efficient method.

2 cl, 2 dwg