Patent ID: 8910715

Claim:
A well control device comprising: a tube; helical means provided on said tube; a plurality of leading plates, each of said leading plates having at least one fluid passageway and helical means cooperable with said helical means of said tube to facilitate rotational movement of said leading plate about and axial movement of said leading plate along said tube; consumable material disposed between said leading plates; at least one backing plate carried by said tube and having at least one fluid passageway; and at least one yieldable anchor member having at least one fluid passageway, said anchor member being disposed between said at least one backing plate and one of said leading plates and operable to contact a well upon axial movement of said one of said leading plates along said tube in the direction of said backing plate, wherein, upon consumption of said consumable material, said leading plates are rotatably movable about said tube between positions in which the fluid passageways of said leading plates are substantially aligned with the fluid passageways of said backing plate and said yieldable anchor to establish at least one flow channel and positions in which the fluid passageways of said leading plates are misaligned with the fluid passageways of said backing plate and said yieldable anchor to limit fluid flow through said flow channel.