To remain on the good side of the budget guardians, it would be wise to avoid leaving a multi-million-dollar BHA in the hole—a lesson often learned the hard way, when a drillstring is fitted with improperly designed stabilizers. So says Exxon Mobil, which, during a root cause analysis of field failures, found that many anomalies, ranging from stuck pipe to vibration-induced drilling inefficiencies, could be traced to the stabilizers. The results of that investigation led to the development of comprehensive stabilizer selection guidelines that provide manufacturers engineering specifications aimed at enhancing drilling efficiencies, while ensuring that the same BHA run in the hole is pulled out intact.
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