| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 11.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
Method for removing deposits comprising heavy hydrocar bonaceous materials & finely divided inorganic particulate materials from a well, the method comprising a) Injecting aq surfactant compn comprising aq soln contg - Acidic material consisting of 0.1-30% of organic acid selec ted from acetic, formic propionic & citric acids or 0.5-15% of HCl - Alkyl (9-16C) polyglycoside surfactant (0.25-10%) - Ethoxylated alc (0.25-10%) - Alkyl (4-8C) alc (0.1-6%) b) Retaining compn in well for selected time period c) Injecting aq soln into well |
| PATENT PHOTOCOPY | Available on request |
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