E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/35
E21B 43/24 (2006.01) E21B 36/00 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1058070
ABSTRACT OF THE DISCLOSURE The invention relates to an oil recovery string and oil extraction process for use in the recovery of oil from natural oil-bearing formations, in particular unconsolidated tar sands, with improved efficiency and lower installation and operating costs. The invention utilizes an oil recovery pipe with dis- tribution of heat into the formation from the pipe. One impor- tant discovery underlying the invention is that when employing thermal energy to cause flow of oil within an oil-bearing forma- tion into a collecting pipe, important advantages are achieved if heat is released into the formation at the site of the col- lecting pipe. In particular, favourable oil recovery rates can be more quickly achieved and long term recovery rates can be improved. By providing an oil recovery string which serves both for oil collection and for heat distribution, the present inven- tion enables these advantages to be realized and in addition makes an important contribution to reduction of costs by reducing the number of drilling or string driving operations required. The invention therefore comprises an oil recovery string for use in recovering oil from a natural oil-bearing formation with the aid of thermal energy supplied by a fluid heating medium, said string comprising a tubular casing within which there is at least one internal passageway along which heated fluid medium for supplying thermal energy to a said formation can be passed, and at least one duct along which oil can flow along the string, said casing having oil entry apertures disposed at intervals therealong, which aper- tures are in communication with the interior of said duct.
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