초록 ▼

A variable bore ram packer designed for use in a standard ram-type blowout preventer used in oil and gas drilling operations is disclosed. The variable bore ram packer includes top and bottom second plates having a central semi-circular opening which is sized to fit closely about the largest diamete

A variable bore ram packer designed for use in a standard ram-type blowout preventer used in oil and gas drilling operations is disclosed. The variable bore ram packer includes top and bottom second plates having a central semi-circular opening which is sized to fit closely about the largest diameter pipe the variable bore ram packer will seal against. Anti-extrusion plates having a smaller central arcuate opening sized to fit closely the smallest diameter pipe the variable bore ram packer will seal are attached to the underside of the top plate by guide screws. The guide screws extend through slots in the top plates which control the motion of the guide screws and hence the anti-extrusion plates as the anti-extrusion plates move and seat against different diameter tubular members. A packer member of elastomeric material having a central semi-circular opening sized to fit closely the smallest diameter pipe the variable bore ram packer will seal is molded between the top plate and anti-extrusion plates and lower plate to form a unitary structure. A radially disposed cavity is molded in the packer adjacent the anti-extrusion plates to minimize damage to the packer as it moves radially and seals against different diameter tubular members.

대표청구항 ▼

[ What is claimed is:] [1.] A variable bore packer for a ram-type blowout preventer used in oil and gas drilling operations, for sealing against different diameter tubular members, comprising:first and second plates having a central semi-circular opening and leading edges;a plurality of insert segme

[ What is claimed is:] [1.] A variable bore packer for a ram-type blowout preventer used in oil and gas drilling operations, for sealing against different diameter tubular members, comprising:first and second plates having a central semi-circular opening and leading edges;a plurality of insert segments having a smaller central arcuate opening sized to fit closely about the tubular members and coaxial with said central semi-circular opening of said first and second plates;a packer member molded of elastomeric material having a smaller central semi-circular opening sized to fit closely about the tubular members and coaxial with said central semi-circular opening of said first and second plates, said packer member including at least one horizontally disposed opening in said packer extending radially outwardly from said smaller central semi-circular opening to an intermediate position between said smaller central semi-circular opening and said packer's outer edge, said horizontally disposed opening adjacent said plurality of insert segments to minimize damage to said elastomeric material of said packer as said plurality of insert segments move and seat against different diameter tubular members;said plurality of insert segments being disposed between said first plate and said packer member; andsaid packer member, said first and second plates and said plurality of insert segments being molded into a unitary structure allowing said plurality of insert segments to move and seat against different diameter tubular members to prevent extrusion of said elastomeric material between said first and second plates and the tubular member.