Short drill collars are mainly used to adjust the position of bottom-hole drilling tools and improve the function of bottom-hole drilling tools. Their mechanical properties are the same as drill collars, but their length is relatively short and can be determined according to requirements.
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The short drill pipe series is mainly used by oilfield users for convenient connection of drill pipe strings. The joint and pipe body adopt an integral structure, eliminating the welding influence, improving the corrosion resistance of the drill pipe, and extending its service life.
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The top drive swivel is a connector installed at the top of the drill string, used to connect with the circulation system to circulate drilling fluid. Its upper end is always a 2" LP male coupling, connected to the circulation system via a swivel (provided by the user); the lower end is a drill pipe male coupling, connecting to the drill pipe. The swivel is to be provided by the user.
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