Patent ID: 9133692
Filing Date: 2015-09-15
Classification: E21B

Abstract:
1. A circulation valve assembly mounted in a tubular inner string extending from a surface location through a packer for placement on a single support located on said packer in a wellbore, comprising: an outer mandrel supported by the tubular inner string for selective positioning for support on the single support on said packer to selectively divide the wellbore into an upper and a lower annulus defined at the wellbore by the packer when said packer is set; an inner mandrel within said outer mandrel having a passage therethrough and supported by the tubular string and relatively movable with respect to said outer mandrel when said outer mandrel rests on said single support on said packer; said inner and outer mandrels defining an annular passage therebetween, said annular passage selectively communicating said upper and lower annulus by being selectively opened and closed with movement of said inner mandrel with said outer mandrel resting on said single support while leaving said passage through the inner mandrel open for fluid delivery from the surface location.