04296969 is referenced by 40 patents and cites 2 patents.

Normally immobile mineral values are recovered from a subterranean formation by penetrating the formation with an access shaft and drilling two radial arrays of substantially horizontal wells out into the formation from the shaft, one array of wells being substantially shorter than the other array. A mobilizing fluid is injected into the formation via alternate longer wells so that an outer zone of high fluid mobility is created in the formation. Then the mobilizing fluid is injected into all of the longer wells to sweep the mineral values to the shorter wells where such values are recovered. Improved sweep efficiency of the mineral values is achieved thereby.

Title
Thermal recovery of viscous hydrocarbons using arrays of radially spaced horizontal wells
Application Number
6/139618
Publication Number
4296969
Application Date
April 11, 1980
Publication Date
October 27, 1981
Inventor
Bertram T Willman
Calgary
CA
Agent
Michael A Nametz
Assignee
Exxon Production Research Company
TX, US
IPC
E21C 41/10
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