Patent ID: 9309741
Filing Date: 2016-04-12
CPC Classification: E21B

Claim Text:
1. A system for isolating one or more water flooded sections of a well bore comprising: an outer tubular and an inner tubular having an annulus formed therebetween and forming a closed system, an external surface of the outer tubular facing the one or more flooded sections of the well bore, the inner tubular having at least a first plurality of perforations formed along a first portion of the inner tubular and a second plurality of perforations formed along a second portion of the inner tubular, the first and second portions if the inner tubular being located fore and aft of the one or more flooded sections of the well bore; a pump for supplying a cooling agent at a first end of the inner tubular, wherein during operation of the pump the cooling agent exits the inner tubular through the at least a first and second pluralities of perforations, enters the annulus and causes water located between the external surface of the outer tubular and a wall of the well bore to freeze and form ice plugs, thereby isolating the one or more flooded sections of the well bore from other sections of the well bore; wherein the inner tubular further includes at least a third plurality of perforations formed along a third portion of the inner tubular, wherein during supplying of the cooling agent, at least some of the cooling agent exits the third plurality of perforations, enters the annulus and causes water located between the external surface of the outer tubular and one or more crevices in the wall of the well bore to freeze and from an additional ice plug, thereby isolating the one or more crevices from remaining flooded sections of the well bore.