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• W2035553614 endingPage "6899" @default.
• W2035553614 startingPage "6885" @default.
• W2035553614 abstract "Rotary drilling systems equipped with drag bits or fixed cutter bits (also called PDC), used for drilling deep boreholes for the production and the exploration of oil and natural gas, often suffer from severe vibrations. These vibrations are detrimental to the bit and the drillstring causing different failures of equipment (e.g., twist-off, abrasive wear of tubulars, bit damage), and inefficiencies in the drilling operation (reduction of the rate of penetration (ROP)). Despite extensive research conducted in the last several decades, there is still a need to develop a consistent model that adequately captures all phenomena related to drillstring vibrations such as nonlinear cutting and friction forces at the bit/rock formation interface, drive system characteristics and coupling between various motions. In this work, a physically consistent nonlinear model for the axial and torsional motions of a rotating drillstring equipped with a drag bit is proposed. A more realistic cutting and contact model is used to represent bit/rock formation interaction at the bit. The dynamics of both drive systems for rotary and translational motions of the drillstring, including the hoisting system are also considered. In this model, the rotational and translational motions of the bit are obtained as a result of the overall dynamic behavior rather than prescribed functions or constants. The dynamic behavior predicted by the proposed model qualitatively agree well with field observations and published theoretical results. The effects of various operational parameters on the dynamic behavior are investigated with the objective of achieving a smooth and efficient drilling. The results show that with proper choice of operational parameters, it may be possible to minimize the effects of stick-slip and bit-bounce and increase the ROP. Therefore, it is expected that the results will help reduce the time spent in drilling process and costs incurred due to severe vibrations and consequent damage to equipment." @default.
• W2035553614 created "2016-06-24" @default.
• W2035553614 creator A5013606701 @default.
• W2035553614 creator A5075948047 @default.
• W2035553614 date "2014-12-01" @default.
• W2035553614 modified "2023-09-25" @default.
• W2035553614 title "Modeling and analysis of stick-slip and bit bounce in oil well drillstrings equipped with drag bits" @default.
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• W2035553614 doi "https://doi.org/10.1016/j.jsv.2014.08.001" @default.
• W2035553614 hasPublicationYear "2014" @default.
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