射孔管柱振动参数实测及其ALE数值仿真分析

The strong shock wave generated by the perforation detonation acts on the perforation section pipe string, and it often leads to the plastic bending, fracture of the pipe string and the fracture of the packer center pipe. In order to obtain the key parameters of the perforation string vibration, to understand the dynamic response of the string under the perforation detonation shock, 7″×12.65mm P110 casing and 2 7/8″×7.82mm P110 oil tube commonly used in the oil field are taken as example of string combination, using ANSYS software's AUTODYN module, a finite element transient model with a length of 11m is established. The EULER model is used to describe the casing and perforated segment strings that serve as the boundary of the solid wall. The EULER-MULTIMATERIAL is used to describe the macro-deformation perforating fluid and the perforating projectile that undergoes a solid-liquid phase change, and to simulate the violent movement of the perforating fluid and the fluid-structure coupling effects of perforating fluid, casing and tubing string. The key data of perforating fluid pressure pulsation and string vibration are extracted from the post-processing results; the perforating pressure and column vibration tester is developed independently, and the annulus perforating hydraulic pressure, the pulsating, perforating column vibration velocity and acceleration are measured; the numerical analysis results are compared with the measured ones, the vibration law of the perforation segment string is analyzed. Studies show that the stress values near the packer string are larger, verifying that the perforating string is often inferred from the causes of the bends and breaks at the packer. The measured results of the perforating liquid peak pressure and the numerical analysis results are 174.8MPa and 191.4MPa, and the difference between them is 9.5%. The maximum values of the axial acceleration along the upper and lower directions of measured and numerical analysis were 178.4m/s², 169.5m/s², 189.1m/s², and 155.2m/s², respectively. The differences between the measured and the finite element analysis results are 6% and 8.4% respectively. It shows that the application of the Euler and EULER-MULTIMATERIAL coupling algorithm to simulation of the perforation detonation is satisfactory with the precision requirement. The results in this paper may be a reference for on-site construction.