| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 10.00 |
| PATENT ASSIGNEE | Atlantic Richfield |
| PATENT CLAIMS |
Method for selectively increasing the permeability of a subterranean formation penetrated by a wellbore penetrating at least one hydrocarbon-bearing zone & at least one water bearing zone which has been treated by positioning a cross-linked polymer gel in the oil-wet zone & in the water-bearing zone, the method consisting of - Injecting compn consisting of at least one gel inhibiting/gel breaking material selected from 1-16C carboxylic acid, 1-10C alc & an oil, through the wellbore into contact with the hydrocarbon-bearing & water-bearing zones - Maintaining compn in contact with said zones for time suffi cient to break at least major portion of the polymer gel in hydrocarbon-bearing zone |
| PATENT PHOTOCOPY | Available on request |
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