piston for a blowout plug, sealing structure for a piston of a blowout plug, anti-blowout plug, and method for sealing pistons from an anti-blowout plug

摘要

A blowout preventer and seal structure for a blowout preventer, the seal structure having a the body with two front faces including a first face and a second face, a projection projecting out from the body, the first face on the projection, the second face in a plane, and the projection with the first face projecting out beyond the plane. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).