Patent ID: 9187978
Filing Date: 2015-11-17
Classification: E21B

Abstract:
1. A downhole tool, comprising: a housing for use downhole defining a first bore; a mandrel disposed in the first bore and defining a second bore, the mandrel having first and second mandrel sections, the first mandrel section defining a first cross-port for communicating fluid in the second bore with an annular space between the mandrel and the housing; a seat disposed in the first bore of the housing between the first and second mandrel sections, the seat movable to a constricted state in the first bore and movable to an expanded state in the first bore; and a piston disposed in the annular space, the piston in a first position at least temporality supporting the seat in the constricted state, the piston movable in response to the communicated fluid to a second position removing the at least temporary support of the seat.