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Bertram T Willman: Method of treating reservoirs containing very viscous crude oil or bitumen. Exxon Production Research Co, E T Wheelock, June 28, 1983: US04390067 (339 worldwide citation)

A method for treating a field containing viscous oil or bitumen for subsequent production is described. The steps central to the process are drilling a horizontal well within the oil-bearing stratum, and heating the oil in the vicinity of the horizontal well to produce a hot liquid corridor. The ope ...


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Bertram T Willman: Thermal recovery of viscous hydrocarbons using arrays of radially spaced horizontal wells. Exxon Production Research Company, Michael A Nametz, October 27, 1981: US04296969 (40 worldwide citation)

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. ...


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