Wells – Processes – Distinct – separate injection and producing wells
Patent
1974-11-07
1976-03-30
Purser, Ernest R.
Wells
Processes
Distinct, separate injection and producing wells
E21B 4316
Patent
active
039468100
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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Purser Ernest R.
The Ralph M. Parsons Company
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