A new type of fluid wall attached self-excited hydraulic oscillator and its jet oscillation characteristics

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (17) : 193-203.

ABULIMITI Aibaibu1,2, LIU Yonghong1, PANG Dexin2, JIAO Wenfu2, GUO Xinwei2

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Abstract

In order to reduce the friction between the drill string and the borehole wall during the drilling process, effectively improve the back pressure and sticking phenomenon and increase the effective WOB, a fluid-attached self-excited hydraulic oscillator was designed, which can make the drill string cycle The axial vibration can change the form of friction between the drill string and the well wall and improve operation efficiency. The principle of the device is explained through theoretical analysis and numerical simulation. The mathematical model of the friction force of the pipe string under axial vibration is established by theoretical mechanics analysis and Matlab programming method; the finite element numerical simulation method is used to analyze the parameter sensitivity of the oscillator, using The full-scale physical model test conducted actual measurement and analysis of the vibration characteristics of the device under different displacements, and verified the vibration drag reduction effect of the device in the application of coiled tubing deepening drilling. The results show that the inlet/outlet ratio is more sensitive to the change in the inlet pressure of the device, and the cavity length and displacement of the oscillation cavity are more sensitive to the inlet pressure and frequency of the device; changes in the inlet/outlet ratio and displacement have a significant impact on the drag reduction efficiency. It is negatively correlated with drag reduction efficiency, and the displacement is positively correlated with drag reduction efficiency; the extreme value and amplitude of the device inlet pressure increase with the increase of displacement, and the axial vibration displacement amplitude of the device is positively correlated with the pump displacement; the device The footage speed of coiled tubing drilling can be increased by 128.6%, and the speed-increasing effect is obvious. The research results can provide a basis for the industrial application of fluid-attached self-excited hydraulic oscillators.
Key words:Self-excited pulsed; Conda effect; Sensitivity analysis; The full-size test; Field application

Key words

Self-excited pulsed / Conda effect / Sensitivity analysis / The full-size test / Field application

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ABULIMITI Aibaibu1,2, LIU Yonghong1, PANG Dexin2, JIAO Wenfu2, GUO Xinwei2. A new type of fluid wall attached self-excited hydraulic oscillator and its jet oscillation characteristics[J]. Journal of Vibration and Shock, 2022, 41(17): 193-203

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