Fatigue measurement method for coiled tubing & wireline
OwnerKenneth Ray Newmaninventor
Life of this patent
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Abstract
A method for determining fatigue life reduction in a string; the method, in at least certain aspects, including providing at least one sample from a string that has been subjected to corrosion, fatigue testing the at least one sample to determine a measured remaining fatigue life, calculating an expected remaining bending fatigue life for the at least one sample, and comparing the measured remaining fatigue life to the expected remaining bending fatigue life to determine the extent of reduction in fatigue life of the string.
Claims21
1-21. (canceled)
A method for determining fatigue life reduction of a string due to corrosion, the method comprising
- providing at least one sample from a string, the string and the at least one sample having been subjected to corrosion,
- fatigue testing the at least one sample providing an actual fatigue test result,
- calculating an expected fatigue result for the at least one sample, said calculating not taking the corrosion into account,
- determining whether the string's fatigue life has been reduced due to corrosion by comparing the actual fatigue test result to the expected fatigue result.
A computer readable medium containing instructions, that when executed by a computer, implement a method for determining fatigue life reduction in a string due to corrosion, the method including
- calculating an expected remaining bending fatigue life for the at least one sample, said calculating not taking the corrosion into account, and
- determining whether reduction in fatigue life has occurred due to corrosion by comparing the measured value for the remaining fatigue life to the expected remaining bending fatigue life,
- wherein a measured value for a remaining fatigue life of at least one sample from the string is input into the computer, and said measured value is determined by fatigue testing the at least one sample.
A method for determining fatigue life reduction in a string due to corrosion, the method comprising
- providing at least one sample from a string, the string and the at least one sample thereof having been subjected to corrosion,
- fatigue testing the at least one sample to determine a remaining fatigue life for the at least one sample,
- calculating an expected remaining bending fatigue life for the at least one sample, said calculating not taking the corrosion into account, and
- determining whether the fatigue life of the string has been reduced due to corrosion by comparing the remaining fatigue life to the expected remaining bending fatigue life.
Dependencies are inferred from the claim text.