| 主权项 |
1. An apparatus for restricting fluid flow through a downhole tubular member, the apparatus comprising:
an annular housing configured for use in a wellbore; an annular sleeve configured to be received within the housing, the annular sleeve having an inner surface defining a first section of a first diameter and a second section of a second, smaller, diameter; and a resilient split-ring baffle at least partially received within the sleeve, the baffle comprising a longitudinal seam forming two separate circumferential ends in the baffle, the baffle being longitudinally moveable between a first position in the first section and a second position in the second section of the sleeve, wherein an outer surface of the baffle is configured to engage the inner surface of the sleeve to cause the baffle, when in the first position to be relatively radially expanded, and, when moved to the second position in the sleeve, to radially contract. |
