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- W1970251036 abstract "Abstract Most existing state-of-the-art diagnostic models, that determine the downhole conditions from polished rod data, are based on the limitations of presuming vertical hole and neglecting the rod-tubing rub. Sometimes, the current diagnostic techniques have been found to cause unrealistic results in the wells where excessive rod friction is suspected. This paper presents an improved model of rod motion with combined Coulomb and viscous friction. Using Fourier series, an exact steady-state solution of longitudinal vibrations of sucker rod has been developed analytically. The effect of transverse displacement is calculated with Galerkin energy principles. It provides a uesful tool to diagnose the downhole operating conditions in straight inclined well even in vertical well with severe dog leg." @default.
- W1970251036 created "2016-06-24" @default.
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- W1970251036 date "1994-04-27" @default.
- W1970251036 modified "2023-09-27" @default.
- W1970251036 title "A Method for Diagnosing the Performance of Sucker Rod String in Straight Inclined Wells" @default.
- W1970251036 cites W1996168036 @default.
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- W1970251036 doi "https://doi.org/10.2118/26970-ms" @default.
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