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During the process of curve section or long radius drilling in the horizontal well, between the drilling string and wellbore, the phenomenon of friction, sticking and backing pressure is very serious. The newly developed Hydro-oscillator could make vibration in radial direction and axial ones. So the tool could reduce the sliding friction and increase the effective drilling weight of the bit(WOB)...
Damping changeability design and evaluation is the most fundamental issue at the beginning of any new semi active hydraulic damper or its control system development. In this study, the changeable damping strategy for the sky-hook control of a rail vehicle semi-active hydraulic damper, which has three parallel orifices, is designed. Fluid formulae for the changeable damping calculation under different...
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