A threaded pipe connection is disclosed for connecting two joints of pipe having externally threaded pin members, one pin member having external right-hand threads and the other pin member having left-hand threads. An internally threaded coupling having right and left-hand threads that mates with the threads on the pin members. An internal pressure seal ring is positioned to provide a seal between the ends of the pin members. A plurality of mating lugs and grooves on the ends of the pin members ...

There is disclosed a ram type blowout preventer with rams having ram front packings disposed within a recess extending across the front face of each ram body and including a seal strip of elastomeric material, metal plates above and below the strip of elastomeric material, and strips of non-elastomeric, relatively rigid material between the seal strip of elastomeric material and the top and bottom metal plates.

A clamping assembly for connecting and disconnecting aligned hubs of a first and a second pressure vessel is provided. The clamping assembly includes a pair of clamp segments and at least one cam in operable engagement with the clamp segments. The clamp segments are movable between a closed position to engage the hubs and an open position to disengage from the hubs. The movement of the clamp segments from the closed position to the open position operates the cam to separate the hubs.

A sub-sea mud pump system includes a plurality of pump units, and each pumping unit includes a plurality of pumping elements. Each pumping element includes a pressure vessel with a first and a second chamber, a separating member between the first and second chambers, a measurement device adapted to measure the volume of at least one of the first and second chambers, a hydraulic inlet control valve and a hydraulic outlet control valve coupled to the first chamber, a mud suction valve and a mud di...

An underwater pipeline is disclosed that arrests the propagation of a collapse or buckle that may occur as the pipeline is being laid or after the pipeline is in service. The pipeline comprises a plurality of joints of pipe connected end-to-end by a threaded connection. Each connection includes external cylindrical threads of opposite hand on adjacent ends of the pipe joints. A coupling having right and left-hand threads for moving the ends of the pipe joints into abutting position in sealing en...

A ram for a blowout preventer for coil tubing is disclosed. It includes a ram body having a flat face with a semi-circular cavity therein for engaging the flat face of an oppositely facing ram having a semi-circular cavity in its face. A seal member is carried by the ram to engage a seal member carried by the opposite facing ram to prevent the flow of fluid between the rams and a section of coil tubing extending vertically between the rams and encircled by the semi-circular cavities in the faces...

A rotary valve is opened and closed with a combination incremental rachet mechanism and a continuous motor mechanism. Two separate control circuits are used for opening and closing the valve. When the opening or closing circuit is energized alone, the valve is incrementally opened or closed by the ratchet respectively. When the opening circuit is energized and the closing circuit is subsequently energized, the valve is continuously opened by the motor. Likewise, when the closing circuit is energ...

A rotating diverter for isolating fluid in a well from other fluid above the well is provided. The rotating diverter includes a housing body which has a bore running through it. A retrievable spindle assembly which includes a spindle and a bearing assembly is disposed in the bore. The bearing assembly supports the spindle for rotation. The spindle is adapted to receive and seal around a tubular member, and rotation of the tubular member rotates the spindle within the bore. A lock member is dispo...

A threaded pipe connection is disclosed that includes a box member and a pin member. The box member has two wedge thread steps each with a tapered, internal, generally dovetail-shaped wedge thread having stab flanks, load flanks, roots, and crests. The pin member has two wedge thread steps each with a tapered, external, generally dovetail-shaped wedge thread having stab flanks, load flanks, roots, and crests. The internal thread of the box member increases in width in one direction. The external...

An improved rubber stock with a unique carbon black system including mismatched pairs of furnace blacks with fumed silica and a silane coupler has been developed. The carbon black system includes a mixture of large and small particles with high and low structure carbon black pairs. The carbon black system compounded with polar and nonpolar rubber provides products with a range of desirable characteristics using only two carbon blacks.