The Numerical Simulation On Performance Of Sharped Charge Jet From Powered Liner

Oil acts as major energy and high-quality chemical raw materials, the status and role in building a country’s people’s livelihood, economic development and national defense construction are very important. Well perforation is a key technology in oil exploration and exploitation, perforating gun and perforation of oil are important tools for well perforation, shaped charge liner is the heart of perforation, therefore, the study of the liner is particularly important. Using ANSYS/LS-DYNA in this paper, the performance of shaped charge jet from powdered liner was studied by numerical simulation method, The main contents and results are as follows:(1) Formation theory of shaped charge jet and parameter calculation of equation of state. The classic formation theory of shaped charge jet is taken, giving the calculation method of velocity and quality of jet and slug after shaped charge jet formed; the classic penetration theory of shaped charge jet is taken, giving the calculation method of target penetration depth. In this article, do theoretical analysis of the equation of state of solid material and porous material, and deduce the calculation method of the equation of state parameters, then the equation of state parameters of solid copper and copper with 11.53% porosity are calculated to provide basic data for numerical simulation(2) Temperature field and formation process of shaped charge jet. For the stability of jet movement, taking adaptive mesh method, using ANSYS/LS-DYNA-2D, the temperature field of shaped charge jet from porous liner are described and analyzed in detail, and comparing to solid liner, the simulation results show that the temperature of shaped charge jet from porous liner is higher than the temperature of jet from solid liner, copper liner with 11.53% porosity shows better ductility and penetrating ability than solid liner. For the shell and porosity influence on the tip of jet, taking Arbitrary Lagrange and Euler method, using ANSYS/LS-DYNA-3D, for perforation of oil with shell porous liner, a detailed description and analysis on the formation process of shaped charge jet and jet parameters distribution is taken, comparing the shell and porosity influence on the tip of jet. The results show that the tip velocity of jet decreasing order is perforation of oil with shell porous liner, perforation of oil with shell porous liner, perforation of oil without shell porous liner, perforation of oil without shell solid liner, shell has greater influence than porosity on the tip velocity of shaped charge jet from perforation of oil.(3) Shaped charge jet penetrating target. The adaptive mesh method is used, using nonlinear dynamics finite element software ANSYS/LS-DYNA-2D, at the temporal point of view, the characteristics of shaped charge jet formation, penetration depth and tip velocity of porous copper liner are studied in detail with numerical methods. The formation and penetrating processes of solid copper liner jet are numerical simulated comparatively. It is demonstrated by the results of target feature between porous and solid liner that, copper liner with 11.53% porosity shows better penetrating ability than solid liner in both penetration depth and crater diameter.The research work of this paper provides a method of calculating porous material equation of state parameters, makes the study on numerical simulation of the porous liner achieved, and simulations to verify the excellent properties of porous liner, provides some theoretical basis and simulation data for the design of powered liner.