Analysis of Factors Affecting the Collapse Strength of Perforating Gun

The collapse strength of perforating gun is one of the key concerns for perforating equipment manufacturers and users. The three-dimensional model of the perforating gun is established using SolidWorks software, and then imported into ANSYS finite element analysis software to establish its three-dimensional FEA model. Simulations are conducted to analyze the influencing factors and influence laws of perforating gun’s collapse strength. The results show that the collapse strength decreases with the increase of hole density and diameter. Under the same conditions, the collapse strength of the perforating gun is 8.71% smaller when the hole density is increased from 8 holes/m to 24 holes/m. In the common spiral hole phase angle of 30°, 45°, 60°, 90°, 120° and 180°, the perforating gun has the highest collapse strength under the phase angle of 60°. The blind hole depth has the greatest influence on the collapse strength. With the increase of the blind hole depth, the perforating gun’s collapse strength decreases sharply. If the concentricity and cylindricity tolerance is greater than 1 mm, the perforating gun’s collapse strength will be considerably reduced. As the well temperature and the axial tensile force increase, the collapse strength of the perforating gun will also decrease.