GB1478724A - Ram type blowout preventer - Google Patents

Abstract

1478724 Wells &c S A ARZUMANOV A A DANIELIANTS K S O ALIVERDIZADE G N O SEIDOV A T O RASI-ZADE B O FRENKEL and Y A SAMOILOV 6 Aug 1975 32841/75 Heading E1F A ram type blowout preventer includes a housing 1 having converging side walls 3 and a pair of tapered rams 4, each ram 4 consisting of a resilient packing 7 containing radially disposed reinforcing members 8 and a packing holder consisting of at least two members 19, 20 coupled together and movable relative to each other in a direction transverse to the direction of movement of the ram 4. The converging walls 3 of the housing 1 may be provided by the housing itself as shown in Fig. 2 or may be provided by triangular inserts (not shown) fixed to the side walls of a conventional parallel sided ram housing. The packing 7 of each ram 4 consists of a resilient block containing reinforcing members 8, each member 8 (Fig. 8) consisting of horizontal tapered plates 9 joined by a vertical member 10 provided with an aperture 13. The inner ends 11 of the plates 9 are inclined to conform to the curved shape of the inner end of the ram 4 (see Fig. 2). The packing 7 is mounted on a holder consisting of a central member 15 fixed to the piston rod 18 of an hydraulic piston 30 and cylinder 29 assembly, and a pair of L-shaped side members 19, 20 which are connected to the central member 15, transverse movement of the side members 19, 20 being permitted by bolt 48 and slot 16 connections (Fig. 4). Alternatively the central member 15 may be omitted (not shown), the packing holder consisting of a pair of side members coupled together for relative transverse movement. The blowout preventer may be used for sealing against a well tool or for closing the well bore in the absence of a well tool.