Abstract
ABSTRACT Helmerich & Payne International Drilling Co. has developed a data base of drill string failures experienced in the Anadarko Basin over a two year period. The analysis of this data has led to some operational changes in an effort to minimize drill string problems. This paper discusses the drill string failures experienced as well as the courses of action taken in an effort to reduce future failures. Significant conclusions have been drawn from both the drill collar failures as well as the drill pipe failures. The drill collar failure analysis shows that a minimum bending stength ratio of 2.4 is recommended to avoid drill collar connection problems in the Anadarko Basin. Analysis of the drill pipe failures revealed that 43% of the failures occurred within the first 15 joints above the bottom hole assembly· As a result, H & P has increased the use of heavy walled drill pipe above the bottom hole assembly.
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