An axial oscillation tool is proved to be effective in solving problems associated with high\nfriction and torque in the sliding drilling of a complex well. The fluidic axial oscillation tool, based on\nan output-fed bistable fluidic oscillator, is a type of axial oscillation tool which has become increasingly\npopular in recent years. The aim of this paper is to analyze the dynamic flow behavior of a fluidic\naxial oscillation tool with the absence of a throttling plate in order to evaluate its overall performance.\nIn particular, the differences between the original design with a throttling plate and the current\ndefault design are profoundly analyzed, and an improvement is expected to be recorded for the latter.\nA commercial computational fluid dynamics code, Fluent, was used to predict the pressure drop\nand oscillation frequency of a fluidic axial oscillation tool. The results of the numerical simulations\nagree well with corresponding experimental results. A sufficient pressure pulse amplitude with a low\npressure drop is desired in this study. Therefore, a relative pulse amplitude of pressure drop and\ndisplacement are introduced in our study. A comparison analysis between the two designs with and\nwithout a throttling plate indicates that when the supply flow rate is relatively low or higher than\na certain value, the fluidic axial oscillation tool with a throttling plate exhibits a better performance;\notherwise, the fluidic axial oscillation tool without a throttling plate seems to be a preferred alternative.\nIn most of the operating circumstances in terms of the supply flow rate and pressure drop, the fluidic\naxial oscillation tool performs better than the original design.
Loading....