Method and apparatus for recovering high viscosity oils

Details Method and apparatus for recovering high viscosity oils Method and apparatus for recovering high viscosity oils

E - Fixed Constructions

21

B

166/33

E21B 43/20 (2006.01) E21B 43/16 (2006.01) E21B 43/24 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1148854

METHOD AND APPARATUS FOR RECOVERING HIGH VISCOSITY OILS ABSTRACT OF THE DISCLOSURE Improved methods and apparatus are provided for recover- ing high viscosity oils from sub-surface earth formations. IN particular, a large diameter shaft hole is employed and a plur- ality of substantially horizontal drill holes extend radially from the shaft hole into the formation. It is a feature of this invention to provide vertically spaced drill holes oriented to improve the recover of the oil. The methods are provided for further enhancing oil recovery by coordinating the injected fluid with the location of injection within the formation.

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