In situ recovery of hydrocarbons from tar sands

Details In situ recovery of hydrocarbons from tar sands In situ recovery of hydrocarbons from tar sands

1974-11-07

1976-03-23

Purser, Ernest R.

Wells

Processes

Separating material entering well

E21B 4316

Patent

active

039454355

ABSTRACT:
Hydrocarbon products from viscous tar sands are recovered by continuously injecting a hot solvent containing relatively large amounts of aromatics into the formation. Alternatively, steam and solvent are cyclically and continuously injected into the formation to recover the values. The last stimulation is by steam so that solvent is recovered. A third alternative is to continuously inject a mixture of steam and solvent vapors and liquid into the formation. In all cases, the solvent, except perhaps for startup, is produced at the site, as in a conventional topping unit, which alternatively is combined with a conventional visbreaking or reforming unit to increase the volume and/or aromaticity of the solvent produced.

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patent: 3695354 (1972-10-01), Dilgren et al.
patent: 3768559 (1973-10-01), Allen et al.
patent: 3837399 (1974-09-01), Allen et al.
patent: 3838738 (1974-10-01), Redford et al.

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