Mixed well stream drive drainage process

Details Mixed well stream drive drainage process Mixed well stream drive drainage process

E - Fixed Constructions

21

B

E21B 43/24 (2006.01) E21B 7/08 (2006.01) E21B 43/17 (2006.01)

Patent

CA 2142001

A thermal recovery process is disclosed. In one embodiment the process includes the steps of: locating a heavy oil reservoir having a plurality of laterally separated, generally vertical wells whose use have left the reservoir partially depleted and characterized by combinations of a heated depletion zone, a heated channel, mobility and communication, voidage, a fracture direction, and a major permeability trend direction; drilling new a well having a horizontal section that is generally perpendicular to the fractures or the major permeability trend and that has an opening therein that is located laterally between at least two of the vertical wells and at a depth within the lower half of the reservoir; injecting a steam through the two vertical wells to establish thermal communication with said horizontal well; and using the combination of pressure drive from the injected steam and gravity drainage to recover oil from the heavy oil reservoir through the horizontal well.

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