Crossover-and-subs
Crossovers
Crossovers are a short subassembly used to enable two components with different thread types or sizes to be connected.
Lift Subs
Lift subs are primarily used to lift drill collars. They normally have a shank and tapered lifting point for use with rig elevators.
Water-bushings
Water-bushings are used to connect casing to drill-pipe. They come in various sizes ranging from 4 ½" to 20" OD. These can also be used to hang off the string. Working pressures and hang off weights are available on request.
Circulating Subs – (Pump-in/Side Entry/Drop Ball)
These are a variety of components used to pump in fluids and/or clean the well.
Circulating Swage
Swages are used to circulate fluid in order to clean casing prior to ongoing operations.
These range in size from 4½" to 20"
Casing Crossover
Casing Crossovers are generally used to cross over from cement heads to particular casing thread types. They range in size from 4 ½” to 20” and are not necessarily always the same OD.
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