Processes for producing bitumen from tar sands and methods...

Details Processes for producing bitumen from tar sands and methods... Processes for producing bitumen from tar sands and methods...

E - Fixed Constructions

21

B

166/35

E21B 43/24 (2006.01)

Patent

CA 1064820

PROCESSES FOR PRODUCING BITUMEN FROM TAR SANDS AND METHODS FOR FORMING A GRAVEL PACK IN TAR SANDS (D#72,621-F) ABSTRACT OF THE DISCLOSURE A new process for producing bitumen from a subterranean reservoir of tar sands comprises basically (1) heating the casing for melting the bitumen from the tar sands adjacent the casing for forming a passage in the reservoir from upper perforations at the top of the reservoir to lower perforations at the bottom of the reservoir, (2) setting a packer in an annulus between the casing and a tubing therein between the upper and lower perforations, (3) circulating hot fluids from the upper per- forations and back into lower perforations for melting more bitumen from the tar sands for forming a predetermined size cavity around the casing, (4) pulling the tubing and packer, and rerunning the tubing with the packer and a screen, (5) ejecting a gravel pack material slurry into the cavity around the screen, (6) ejecting more hot fluids into the cavity for melting more bitumen from the tar-sands, and (7) flowing the melted bitumen through the gravel pack, lower perforations, and screen for filtering out the sand and gravel from the melted bitumen for recovering the melted bitumen at the surface. A modification comprises position- ing the screen in the annulus over the upper perforations and forming the gravel pack thereover, consolidating it, and passing the hot fluids down the tubing for ejection from the lower perforations for producing the bitumen through the upper gravel pack, upper perforations, and screen for recovery at the surface. Two new methods for forming a gravel pack in a subterranean reservoir of tar sands is likewise disclosed. -I-

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