Annular preventer

An annular preventer, comprising

• a body defining a throughbore;
• a lid that fits onto said body, said lid comprising a replaceable wear plate, said lid and said body defining a chamber therein with a first interior cylindrical surface within said lid and a second interior cylindrical surface within said body;
• a plurality of latches mounted around a circumference of said body that extend through said body, said plurality of latches comprising retractable jaws that engage corresponding latching surfaces on said lid to selectively secure said lid to said body;
• a conical packing element comprising an opening therethrough operable to receive a pipe extending through said throughbore, said pipe when present defining an annulus between said throughbore and said pipe;
• a piston mounted in said body for movement in an axial direction parallel to an axis through said throughbore, said piston defining an interior conical receptacle that receives said conical packing element, said piston comprising an exterior piston member that moves within an annular piston chamber formed between said piston and said body, said piston comprising a first exterior cylindrical surface and a second exterior cylindrical surface that engage said first interior cylindrical surface and said second interior cylindrical surface;
• a cage that engages said conical packing element to secure said conical packing element between said cage and said replaceable wear plate;
• hydraulic connections on either side of said exterior piston member that extend through said body, said piston being movable in said axial direction in response to hydraulic fluid to selectively compress said conical packing element to seal said annulus around said pipe;
• and
• a plurality of cap screws that extend through said lid to engage said body to prevent rotation of said lid with respect to said body.