DEVICE FOR THERMAL DISPACEMENT OF OIL FROM WELL Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: device consists of casing string cemented to deflected borehole with perforation around circular generatrices in end portion and in beginning of inclined section directly behind cemented annular space, of production string inside casing string and of a packer sealing annular space before circular generatrix of perforation in end portion. The deflected borehole is made as an inclined one and rising to bottomhole. Annular space of the casing string between circular generatrices of perforation is sealed. The production string is communicated with an inlet of the immersed pump and is equipped with a flow regulating valve and a relief valve operating in the direction of the bottomhole. An additional packer is arranged outside the flow regulating valve. The flow regulating valve is made in form of a case with upper and lower rows of radial channels communicated with the production string. A circular spring loaded gate is installed inside the case of the flow regulating valve; the gate shuts off upper rows of radial channels. Also, the gate performs lengthwise travels and compresses a spring under excessive inter-tubular pressure over the additional packer and simultaneously it opens upper rows of radial channels and shuts off lower rows of radial channels of the case of flow regulating valve.

EFFECT: raised efficiency of reservoir heating and increased area of thermal coverage at heat carrier pumping.

2 dwg