考虑套管边界和液柱高压的射孔液压力脉动规律分析

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Abstract Perforation detonation shock and pressure pulsation often lead to accidents, such as bend and break of the column of the emission hole because of vibration.The high pressure of the perforating liquid and the narrow casing boundary that affect the shock wave propagation, and the influence of interference caused by the dense arrangement of perforating bullets were considered.Furthermore, continuity of shock wave propagation at phase change interface was also considered.An initial pressure analysis method of the shock wave was established according to the Tait equation.The law of shock wave propagation was clarified and an analytical method of direct shock wave was established, which both consider the narrow boundary conditions of casings.According to the principle of shock wave reflection, the approximate graphic method was used for solving the parameters of the perforation liquid and the casing interface.The pressure pulsation analysis method was established by applying the superposition principle of direct and reflected waves.After actual perforation verification, the results show that the reflected wave pressure is significantly larger than the incident wave pressure, and the reflected wave pressure decreases with the explosion distance.When perforating bullets are arranged in 16 holes/m, the four nearby bombs affect the shock wave generated by a certain bomb, and the rest can be neglected.The pressure decay is increased by the initial pressure time of the perforating liquid by 30 μs.

Key words： pressure pulsation inter-elastic interference underwater explosion narrow boundary high pressure fluid

Received: 28 February 2019 Published: 15 December 2019

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	LI Mingfei
	DOU Yihua
	CAO Yinping
	YU Yang
	CAO Ting

Cite this article:

LI Mingfei,DOU Yihua,CAO Yinping, et al. Analysis of perforation liquid pressure pulsation law considering complex boundary conditions at the bottom of a well[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(24): 189-196.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I24/189

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