Numerical Simulation Of Perforating Gun Perforating Process

In the oil industry,shaped jet perforating is currently the most widely used and most mature perforating method.The main role of perforating is to communicate oil reservoirs and drilling,and oil will flow from the reservoir through the perforation channel into the well.The perforating gun perforating process is a complex impact dynamics process.After the percussion bomb detonates,the heavy impact load will act on the perforating gun.The charge of the perforating bullet is too large or the design and material selection of the perforating gun sleeve.Unreasonable and so on will lead to perforation failure.This paper uses ANSYS/LS-DYNA finite element software to study and analyze the damage mechanism of perforating gun through numerical simulation of perforating gun perforating process.It provides theoretical and data basis for the design of perforating gun in engineering practice.Based on the changes of the interface of ALE material,the explosives were found to be mainly transmitted to the position of the blind hole of the perforator and the two sides of the perforator,and there was little propagation of the direction of the tail of the perforator.In the optimization design of perforating guns,the experimentally measured pressure-time curve is often used as the load data.In this paper,the numerical simulation of pressure changes in perforating gun water shows that the pressure peak at the position of the pressure sensor in the experiment is 1093 MPa,and the perforation The maximum value of the gun wall pressure is 1283 MPa,and the pressure-time curve at the maximum pressure of the wall surface of the perforating gun is obtained.There are two main factors that affect the strain of the perforating gun barrel: yield strength and failure strain.In this paper,it is found that in the process of shaped guns for perforating guns,the displacement of the perforating gun casing from the inner wall to the outer wall becomes smaller and smaller,and the displacement of the outer wall of the perforating gun barrel from left to right gradually increases.The maximum radial expansion of the hole gun occurs at the blind hole of the perforating gun.When the yield strength of the perforating gun tube material is 750 MPa,the maximum stress on the perforating barrel sleeve is 983 MPa,and the maximum radial deformation is 7.3 mm,which does not meet the requirement of radial expansion of less than 5 mm in the national standards.When the yield strength of the perforating gun bushing material is 835 MPa,the maximum stress of the perforating gun is 1044 MPa,and the maximum radial deformation of the perforating gun sleeve is 4.2 mm,which satisfies the national standard.In this paper,the damage of the perforating gun under different yield strengths was obtained by numerical simulation.It was found that the damage of the perforating gun mainly occurred in the middle of the perforating gun and near the blind hole.The main form of damage was the crack on the wall of the perforating gun.In engineering practice,whether or not the perforating gun can perforate safely can be determined by observing whether there are cracks in the two places.This paper analyzes the effect of the failure strain on the radial expansion of the perforating gun barrel and finds that by increasing the value of the failure strain,the radial expansion of the perforating gun barrel can be effectively reduced.