E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/10, 166/41
E21B 34/12 (2006.01) E21B 34/14 (2006.01) E21B 37/08 (2006.01) E21B 43/116 (2006.01) E21B 43/119 (2006.01)
Patent
CA 1211043
DIFFERENTIAL VENT AND BAR ACTUATED CIRCULATING VALVE AND METHOD ABSTRACT OF THE DISCLOSURE A tool for use downhole in a borehole for carrying out a backsurging method whereby existing open perforations are cleaned. The tool comprises an annular body having spaced cylin- drical walls, each of which reciprocatingly receives spaced pistons which move individually relative to one another. A port is formed through each of the walls of each of the cylinders with the first port being normally closed by a first piston and the second port being normally open. The second piston is moved to close the second port. The tool is placed on the end of a tubing string or within a tool string and run downhole into the bore- hole. A packer device enables the pressure between the lower annulus, the upper annulus, and the tubing to be adjusted rela- tive to one another. A bar is then dropped down the tubing string, contacts the second piston and moves the second piston to cover the second port. The tubing pressure is reduced to provide a pressure differential between the lower annulus and the interior of the tubing. The first valve automatically opens when a predetermined pressure differential is achieved between the tubing and lower annulus, thereby providing a predetermined pressure differential across the old perforations, and cleaning debris therefrom upon the opening of the first port. -2-
434874
Borden Ladner Gervais Llp
Company Halliburton
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