| 摘要 |
<p>Plugging fluid for plugging a zone of a subterranean formation adjacent to a drill hole, especially an oil drill hole, said fluid consisting of a hydrophobic liquid containing a solid silicate or a solid metasilicate, a clay, and a hydraulic cement. Process for plugging a zone of a subterranean formation adjacent to a drill hole, in which said plugging fluid is transported up to said zone while avoiding any contact with water, and in said zone the plugging fluid is brought into contact with an aqueous solution containing cations chosen from alkali metal cations and alkaline-earth metal cations, by means of which a flash setting of the plugging fluid occurs. The process makes it possible to seal the zones of loss of circulation, to permanently isolate zones of a subterranean formation adjacent to a well, surrounding a well, and to put an end to transverse flows. It also makes it possible to block or close up the drilling wells that must be abandoned.</p> |
