Abstract
Abstract Understanding bottom-hole assembly (BHA) dynamic phenomena remains a critical drilling issue due to the substantial cost of associated failures and potential savings from increased drilling efficiency. Many industrial studies have provided useful insight into drillstring dynamics. The current work extends previous efforts by providing a novel BHA model which accounts for several critical response factors and can be augmented to address a variety of other effects. The finite-element technique is used with a frequency-dependent mass matrix to account for the fluid added-mass effect. The BHA excitation is modeled as a vector with components which are monochromatic functions of time. Results from pertinent numerical studies are presented.
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