Method for recovering subsurface earth substances

Details Method for recovering subsurface earth substances Method for recovering subsurface earth substances

E - Fixed Constructions

21

B

166/34

E21B 43/14 (2006.01) E21B 43/24 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1112999

METHOD FOR RECOVERING SUBSURFACE EARTH SUBSTANCES ABSTRACT OF THE DISCLOSURE This invention relates to methods and systems for recovering high viscosity oils, petroleum substances and other minerals from subsurface earth formations. In par- ticular, one or more large diameter shaft holes are provided which preferably terminate in an enlarged subterranean chamber. A plurality of drill holes are provided, with perforated piping which extend radially from the chamber into the formation, and from which oil and the like may be recovered. It is a particular feature of this invention to provide means and methods for injecting a mixture of steam and a noncondensable gas into the drill holes, whereby the driving mechanism of the formation may be selectively maintained or enhanced at the same time the viscosity of the oil in the formation is reduced.

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