A METHOD FOR PRODUCING A PLUGGING LIQUID ON A POLYSACCHARIDE BASIS

摘要

A method for preparing a plugging liquid for plugging of a zone of a subterranean formation around a bore hole, consisting of an emulsion comprising a continuous phase based on a hydrophobic liquid and a discontinuous phase based on a hydrophilic liquid, which emulsion contains an emulsifier, a polysaccharide and a cross-linking agent for said polysaccharide. The method is carried out by introducing the hydrophilic liquid and the hydrophobic liquid into a mixing tank without agitation, introducing the emulsifier into said mixing tank and starting agitation, introducing in any desired order the polysaccharide and the cross-linking agent into the mixture in the tank, each of them pre-wetted by a hydrophobic liquid, and agitating the whole mixture until an emulsion is obtained.