Plunger with flow passage and improved stopper

Portable jet pump system with pump lowered down hole and raised

Pressure-compensated dual marine riser

Progressing cavity pump production tubing having permanent...

Pulley-drive lifting system

Pumping system for oil wells

Reciprocating water well pump

Reentry system for subsea well apparatus

Reverse Moineau motor and centrifugal pump assembly for producin

Reverse Moineau motor and pump assembly for producing fluids fro

Right angle drive adapter for use with a vertical drive head in

Riser assembly

Riser pipe string

Rod pull down tool

Rod pull down tool

Rotary drive apparatus for downhold pump

Rotary drive assembly for downhole rotary pump

Rotary oil well pump and sucker rod lift

Safety coupling for rotary down hole pump

Safety coupling for rotary pump