Description
Haige provides a full range of Rotary Subs for oilfield drilling, including Crossover Subs (X-over), Lifting Subs, Saver Subs, Straight OD Subs, and Reduced OD Subs.
Rotary Subs are made from 4145H Modified Steel Alloy, quenched and tempered to 285 ~ 341 Brinell Hardness as per API Spec. 7-1. They can be used to cross-transition from one connection size to another, or as a disposable component to extend the service life of a more expensive drill stem member.
Crossover Sub ( X-over Sub)
The Crossover Sub is for connecting one BHA connection to another.
Lifting Sub
Lifting Sub enables the safe, efficient handling of straight OD tubulars such as drill collars, shock tools, jars, directional equipment, and other tools by using the drill pipe elevators.
Saver Sub
The saver sub is attached to the bottom of the Top Drive System or Kelly Bar. Those two spots are where the drilling string is most frequently made up or broken out. That means the Sub receives the most wear. The Sub is easily repaired or replaced. An extra saver sub in rotation is good to protect the Kelly.
Straight OD Sub
Straight OD Sub is used to connect drill stem tools with similar outside diameters. The drill bit, downhole tools, heavy-weight drill pipe, and drill pipe can be crossed over using a straight OD sub.
Reduced Section Sub
Reduced Section Sub is used to connect drill stem tools of different diameters, requiring a change in cross-section to accommodate the different connections. This sub would be used to cross over large OD drilling tools or a tapered drill collar string.
