Engineering Calculation and Application of Perforation Impact Dynamic Loads in Oil and Gas well

Abstract

The perforation impact dynamic loads can destroy or disable the tubing strings. The perforated completion process was simplified to explosion of ordinary explosive charge in perforation liquid. The dimensionless expression of perforation impact dynamic loads was derived based on main influence factors and then its engineering calculation formula was set up. A well perforation operation in western Sichuan as an example, the oil tubing strings security was analyzed by the perforation impact dynamic loads from the engineering computation formula. The results show that the tubing strings only occur elastic spiral bucking and do not occur plastic deformation which are in line with perforation operation results on site.

Study on Dynamic Response of Downhole Tools under Perforation Impact Load

“…Zhang et al [19] used ANSYS/AUTODYN software to investigate the effects of the length of perforation zone, the interval time of perforation bullet explosive, the charge quantity in a perforation bullet, the physical conditions of artificial bottom hole, "pocket" depth, and other parameters on the perforation impact load. Li et al [20] presented a dimensionless expression of perforation impact loads as well as its engineering calculation formula. Based on the formula, the buckling behavior of the perforation tube string of an actual well was analyzed.…”

Investigation into the dynamic characteristics of downhole perforation tools with multiple shock absorbers

“…In 2002, Ren et al [3] carried out numerical simulation of an explosion in shallow water using ANSYS/LS-DYNA to obtain the pressure curve of the explosion, but they were unable to obtain the calculation formula for the explosion impact load. Thus, a similar experimental study on underwater explosions was carried out by Li et al [4], who obtained the calculation formula for the explosion impact load, while however ignoring but the rising section of the impact load. Zhang et al [5] presented a model to calculate perforation impact load and investigate the influence patterns law of different parameters on it.…”