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Browsing by Subject "stem exploitation"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Problemy eksploatacji wrzecion głowic płuczkowych
    (2008) Bednarz, Stanisław; Artymiuk, Jan
    Connection of mud swivel to drill string creates the transition zone from rigid mud swivel to thin tubular string rotating at considerable tension load. The sub under swivel stem requires particular care during exploitation and maintenance. Geometry of swivel sub and its thread connection to stem exerts influence on stress concentration at dynamic loads. This leads to material fatigue and microcrack creation risk and connection thread break off or fracture. Material researches carried out allow better assessment of pin crack process during normal work and freeing stuck drill string operation.