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Bitumen recovery from tar sands | 1984-09-11 | Patent; Bitumen recovery; Tar sands; Kerosene; Flotation cell; Bitumen | A process for recovering bitumen from tar sands wherein the tar sands are pretreated with a diluent, such as kerosene in the preferred embodiment, to lower the viscosity of the bitumen such that it is in the range of about 5 to about 20 poise at the digestion temperature. The tar sands are then dige... |
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Method of recovering viscous petroleum from tar sand | 1976-11-30 | Patent; Viscous petroleum recovery; Tar sands | Recovery of viscous petroleum such as from tar sands is assisted using a substantially vertical passage from the earth's surface which penetrates the tar sand and has extending therefrom a lateral hole containing a flow path isolated from the tar sand for circulating a hot fluid to and from the vert... |