Petroleum extraction from hydrocarbon formations

Details Petroleum extraction from hydrocarbon formations Petroleum extraction from hydrocarbon formations

E - Fixed Constructions

21

B

E21B 43/24 (2006.01)

Patent

CA 2545505

Recovery of viscous hydrocarbon by hot fluid injection from subterranean formations is assisted by using a specially designed and under-reamed vertical well to form a central production cavity; combined with a plurality of specially perforated horizontal wells drilled from the surface down to the producing formation, and then drilled laterally to intersect and be operatively connected to the central production well cavity. These continuous horizontal uniwells.TM. behave as single wells with two wellheads, each with multiple injection--production perforation pairs, between which the controlled flow of hot oil via a specialized annular communication zone. The production process is controlled by modulating the hot oil flow where the wellbore fluids act as a hydraulic "P--trap" seal limiting steam bypass. The hot displaced oil is allowed to drain from the lateral horizontal wells in to the central collection cavity.

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