Thermal recovery of viscous hydrocarbons using arrays of...

Details Thermal recovery of viscous hydrocarbons using arrays of... Thermal recovery of viscous hydrocarbons using arrays of...

E - Fixed Constructions

21

B

166/35

E21B 43/24 (2006.01) E21B 43/17 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1158155

ABSTRACT Normally immobile mineral values are recovered from a subterranean formation by penetrating the formation with an access shaft and drilling two radial arrays of substantially horizontal wells out into the formation from the shaft, one array of wells being substantially shorter than the other array. A mobilizing fluid is injected into the formation via alternate longer wells so that an outer zone of high fluid mobility is created in the formation. Then the mobilizing fluid is injected into all of the longer wells to sweep the mineral values to the shorter wells where such values are recovered. Improved sweep efficiency of the mineral values is achieved thereby.

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