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Tools aid discovery of fatigue cracks
03/24/2008
A suite of examination techniques is used to discover fatigue cracks in drilling components. Fatigue is the most common cause of drillstem failure and can occur at stresses well below the normal operating stress in most drillstem components.Several factors influence fatigue, a complex mechanism, including material properties, mud corrosiveness, drilling trajectory, rotary speed, loads, and several others. This complexity plus the lack of meaningful knowledge about the amount of prior fatigue damage, makes accurate, absolute fatigue life prediction practically impossible.1-3In practice, there is no reliable method to quantify the total amount of fatigue damage a component may have accumula...
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