E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/39
E21B 43/24 (2006.01) E21B 43/18 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1173353
Case 5554 GLR/gs/ejl 1.0/12/81 ABSTRACT OF THE INVENTION Viscous materials, such as bitumen, can be recovered from subsurface earth formations, such as tar sands, by forming a shaft or first borehole to the base of the desired subsurface formation, extending the borehole into the underburden, drilling second boreholes upwardly and radially into the formation, injecting steam into these boreholes until the temperature of parts of the formation is such that the viscosity of the material is reduced, and collecting the liberated material. Variations of this basic procedure are discussed.
394246
Bherer John R.l.
Towson Donald E.
Canada Cities Service Limited
Gulf Canada Limited
Husky Oil Operations Limited
Imperial Oil Limited
Petro-Canada Exploration Inc.
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