Patent ID: 9133684
Filing Date: 2015-09-15
Classification: E21B

Abstract:
1. A downhole tool having an interior defining an interior flowpath and an exterior, the downhole tool comprising: an inner sleeve; a housing positioned outwardly of said inner sleeve; a shifting sleeve between the housing and the inner sleeve, said shifting sleeve having a first position and a second position; a first pressure chamber defined, at least in part, by the housing, inner sleeve, and a first end of the shifting sleeve, the first pressure chamber in fluid isolation from the interior flowpath and the exterior of the downhole tool; a second pressure chamber defined, at least in part, by the housing, inner sleeve, and a second end of the shifting sleeve, the second pressure chamber in fluid isolation from the first pressure chamber, the interior flowpath and the exterior of the downhole tool; and a first control device having a first state which prevents fluid communication from the interior flowpath to the first pressure chamber and a second state which permits fluid communication from the interior flowpath to the first pressure chamber; wherein the shifting sleeve moves from the first position to the second position in response to the first control device changing from the first state to the second state.