04456065 is referenced by 300 patents and cites 11 patents.

In a section of an oil field a first and only bore hole (5) is drilled through the strata (3) carrying heavy oil until the underlying stratum (4) void of heavy oil and enlarged to a cavern-like collection chamber (9). Around this first bore hole (5) a plurality of second bore holes (6) are drilled through the strata (3) carrying heavy oil to the stratum (4) in a pattern comprising several circles. A further pattern of third bore holes (7) is drilled also in a circle-like pattern through the strata (5) carrying heavy oil, which third bore holes (7) are followed by drainage channels (8), which extend to the collecting chamber (9). By means of electrodes arranged in the second bore holes (6) the heavy oil strata are preheated and thereafter steam is injected through the same bore holes (6) in order to drive flowable heavy oil against the third bore holes (7). A solvent is injected from the third bore holes (7) into the cone-like heavy oil accumulation (18) and by means of a further injection of steam from the second bore holes (6) the heavy oil rendered flowable by the solvent is driven toward the third bore holes (7) such to flow into the collecting chamber (9) out of which it is finally pumped to the first bore hole (6).

Title
Heavy oil recovering
Application Number
6/294629
Publication Number
4456065
Application Date
August 20, 1981
Publication Date
June 26, 1984
Inventor
Winsor T Savery
The Woodlands
TX, US
Fritz J Wolf
Zollikerberg
CH
Werner Heim
Zollikon
CH
Agent
Jerry Cohen
Assignee
Elektra Energie
CH
IPC
E21B 43/24
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