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| Number | Title | Issue Date |
| 5821203 | Foamed drilling fluids, their process for preparation and the corresponding drilling method The present invention is directed to an aqueous foamed Drilling Fluid for drilling well bores into a subterranean formation, comprising water, at least one clay and at least one foaming agent. According to the invention, it further comprises at least one ... | 10/13/1998 |
