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Did You Know?

Weak Points

  • The weak point of a string won’t necessarily occur at surface and won’t necessarily occur in the smaller/weaker pipe either (if running a taper string).
  • In the example shown the weak point does not occur at surface, nor does it occur in the “weaker” 4½” drill pipe.
  • The weak point actually occurs at around 600’ with the tensile capacity of the string being reduced at this depth as a result of the string being  subject to additional stress from already having to “bend” around the dogleg at ~600’
  • It is important that the combined loads on a string be analyzed and the actual  as drilled surveys taken into account. The example also illustrates the  potential issues that can arise as a result of unplanned large shallow doglegs.