초록 ▼

A blowout preventer and a seal are disclosed for sealing about pipes or other objects in a well bore. The seal element is a semi-circular section of resilient compressible material having a semi-circular inner surface to engage the pipe and embedded radially disposed support elements having anti-ext

A blowout preventer and a seal are disclosed for sealing about pipes or other objects in a well bore. The seal element is a semi-circular section of resilient compressible material having a semi-circular inner surface to engage the pipe and embedded radially disposed support elements having anti-extrusion members which serve in combination with overlapping ram block members to prevent extrusion of the resilient material from the top and bottom of the seal. The top and bottom anti-extrusion members are stair stepped and have interlocking fingers and recesses and are adapted to slide radially and circumferentially with an adjacent anti-extrusion member element as the elements move toward or away from the pipe in the well bore. Flanges on the seal element are provided with top and bottom plates each of which overlaps at least one support element.

대표청구항 ▼

A seal element adapted for use over a range of operating diameters in a blowout preventer having a ram block with upper and lower ram block members, the seal element comprising, an essentially semicircular section of a resilient, compressible material having an inner surface adapted to engage a pipe

A seal element adapted for use over a range of operating diameters in a blowout preventer having a ram block with upper and lower ram block members, the seal element comprising, an essentially semicircular section of a resilient, compressible material having an inner surface adapted to engage a pipe or the like in a well bore having a plurality of radially disposed substantially identical rigid support elements embedded in said material, each support element having a pair of essentially parallel stair-stepped anti-extrusion members that are disposed on opposite longitudinal sides of the semi-circular section and that are interconnected by an integral rib, the integral rib being attached between the top-most step of the lower parallel anti-extrusion member and the lower-most step of the higher parallel anti-extrusion member, said rib extending to said outermost end of said members while being set back from the innermost end of said members, the anti-extrusion members having surfaces for overlapping with adjacent anti-extrusion members, the seal element being adapted to fit within the longitudinal space between said upper and lower ram block members of said blowout preventer such that said ram block members overlap the outermost ends of said top and bottom anti-extrusion members when said seal element is operative on the smallest of its operating diameters.