Equations predict drill-pipe fatigue in Middle East operations

Lubinski's modified equations can be used to predict drill pipe fatigue damage in horizontal and directional wells.During drilling of horizontal wells, an abnormal amount of tubular failures, typically in the form of cracks, occurred in the drill pipe and heavy-weight drill pipe (HWDP) used by land rigs operating in the Middle East.The abnormality of these failures prompted investigations to establish the cause.Time-of-failureDrill pipe should achieve a life expectancy of 300,000 to 350,000 ft within 13,000 to 14,000 rotating hr. Yet the cumulative footage to time-of-failure for a land-rig case study achieved only 177,000 ft over an interval of 8,000 rotating hr. Furthermore, in many ...

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