POLYMERS SWELLING IN WATER PREVENTING LOSS OF CIRCULATION Russian patent published in 2011 - IPC E21B43/32 C09K8/44 

FIELD: gas and oil production.

SUBSTANCE: here is disclosed procedure for treatment of borehole of well entering underground reservoir. The procedure consists in placement of composition of sealant with polymer containing reverse emulsion in borehole of the well to prevent absorption of working substance in the underground reservoir during its placement in the borehole. According to the procedure polymer containing reverse emulsion is dehydrated to content of 10% of water before its placement in the borehole of the well. Composition of sealant for realisation of this procedure includes polymer containing reverse emulsion. The latter includes particles with dimension in the range from approximately 0.01 micron to approximately 30 microns. Also, polymer containing reverse emulsion is produced with its dehydration to content of 10% of water. The invention is developed in dependent clauses of the patent claim.

EFFECT: raised degree of plugging large areas of circulation loss in borehole of well.

21 cl, 9 ex, 16 tbl, 5 dwg