Process for plugging subterranean formations
Abstract
Abstract The invention concerns a new process for plugging and/or consolidating a permeable geological formation, notably when traversed by a borehole. The process, according to this invention, comprises the following steps: (a) insertion into the formation of an overdelayed gelling compound, composed of a gelable material and a hardener, for which the setting time is considerably longer than the suitable positioning time for the composition, in such a way that this permeates the formation over a significant distance. (b) insertion, after a mechanical or fluid plug, of a rapid-action gelling agent, which causes the instantaneous gelling of that part of the overdelayed gelling compound in the immediate neighborhood of the interface between the zone to be treated and the borehole. Thus preventing displacement of the overdelayed gelling compound toward the interior of the formation. The resultant gelling being both resistant and correctly placed. The invention application is to oil, gas, water or geothermal drillings.
Inventors
- 👤 Rudiger Oberste-Padtberg
- 👤 Herve Perthuis
- 👤 Philippe Parcevaux
- 👤 Sylvie Peulet
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
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| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
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