Crossover subs is used to crossover from one connection size to another or as the disposable component used to extend the connection life of a more expensive drill stem member.
BIT SUB 3 1/2″ IF BOX x 3 1/2″ REG BOX ;API CERTIFICATION
Description
Straight subs: Used to connect drill stem members that have a similar OD.
Reduced-section sub: Used to connect drill stem members that have different diameters that warrant the cross-sectional change necessary to accommodate different connections.
Saver sub: Used to extend the life of the rotary kelly by taking the connection wear each time it is made up to a drill stem component.
Bit sub: Size availability ranges from 3 1/8” to 11” OD and 36” to 48” length.
Lift sub: A lift sub enables the safe, efficient handling of straight OD tubular—such as drill collars, shock tools, jars, directional equipment, and other tools—by using the drill pipe elevators.
Top drive sub: Top drive subs serve as the sacrificial element between the drill string and the top drive, reducing repair and maintenance costs.Drill subs are an important integral part of everyday drilling.
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