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Title: Modeling and Control of Stick-Slip and Bit-Bounce in Oil-Well Drill-Strings
Authors: Fatemah A. Al-Sairafi 
Supervisor: Prof. Ahmet S. Yigit
Keywords: Stick-Slip : Drill-Strings
Issue Date: 2016
Publisher:  Kuwait university - college of graduate studies
Abstract: Stick-slip and bit-bounce are common problems while drilling the production sections of oil wells with Polycrystalline Diamond Compact (PDC) bits. The production section often encounters different lithology including highly fractured limestone, sand/sandstone and highly reactive shale. In some cases, vibrations are so severe that they cause failure in drill-string components, loss of expensive tools in the hole such as bit and logging sources/equipment, bit damage, wellbore instability and reduction in the rate of penetration (ROP). This study presents a dynamic model and an active control strategy for reducing stick-slip and bit-bounce of a drill-string with a top-drive system. The model includes complete drive systems for both rotational and axial motions, as well as the hoisting system. Also included is the bit/formation interaction, which facilitates the inclusion of the effects of formation characteristics. First, the equations of axial and torsional motions with open-loop control are derived and solved numerically. Second, separate feedback controllers for axial and torsional motions are designed and incorporated into the model. The simulation results show that it is possible to minimize both stick-slip and bit-bounce and maintain desired drilling conditions. It is shown that the proposed model will be instrumental for determining and realizing optimal drilling conditions. Therefore, the cost related to drilling a specific well will be reduced, and the lifetime of equipment used to drill the well, such as bit, motor, stabilizer, and drill collars, will be increased
Appears in Programs:0630 Mechanical Engineering

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