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Analysis and Control of Oilwell Drilling Vibrations
This book reports the results of exhaustive research work on modeling and control of vertical oil well drilling systems. It is focused on the analysis of the system-dynamic response and the elimination of the most damaging drill string vibration modes affecting overall perforation performance: stick-slip (torsional vibration) and bit-bounce (axial vibration). The text is organized in three parts. The first part, Modeling, presents lumped- and distributed-parameter models that allow the dynamic behavior of the drill string to be characterized; a comprehensive mathematical model taking into account mechanical and electric components of the overall drilling system is also provided. The distribu...
Under the crown
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The Irish Horse
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Program Manager
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Homage to Catalonia
Step into the heart of revolutionary Spain with George Orwell's powerful account, Homage to Catalonia. In this poignant narrative, Orwell recounts his firsthand experiences fighting in the Spanish Civil War, offering a vivid and deeply personal perspective on the political and social upheaval of the time. Orwell’s writing brings to life the intense struggles, challenges, and betrayals he witnessed as he joined the militia in Catalonia. With sharp clarity, he paints a stark picture of the ideological divides that tore the country apart, and the complexities of war that blurred the lines between friend and foe.But here's the twist that will captivate you: What does Orwell’s experience reve...
