Safety accidents such as chucking and damage of perforating guns often occur during perforation operations, which affect the exploration and development process. This paper uses LS-DYNA software to establish a three-dimensional finite element model of perforating bullet-perforating gun-perforating fluid-casing-sandstone, combined with the ALE algorithm, realize the fluid-solid coupling between perforating fluid-jet-gun-casing-sandstone, Analyze the effects of different blast heights and phase angles on the burrs and stress intensity of the perforating gun during the jet penetration process. Studies have shown that when a single bullet and a blast height of 12mm, the burr is 4.1mm, the maximum stress is 1075MPa, and the diameter of the stress area that exceeds the yield limit of the material around the hole reaches 61mm. When the blast height is 18mm, the burr is 3.9mm, the maximum stress is 997MPa, and the diameter of the stress area exceeding the yield limit of the material reaches 45mm; When the blast height is 24mm, the burr is 3.6mm, the maximum stress is 912MPa, and the diameter of the stress area exceeding the yield limit of the material reaches 38mm; The blast height is increased, the burr height and the maximum stress, and the damage area of the perforating gun material are reduced. When the blast height is 12mm and the phase angle is 30°, 60°, and 90°, the height of the burr changes little compared with that of a single piece. The diameter of the stress area exceeding the yield limit of the material is 55mm, 42mm, 66mm. In this area, under high detonation pressure, the perforating gun will bulge outwards, which is the so-called "bulging gun", causing a jamming accident. Therefore, the strength and safety of the perforating gun is better when the phase angle is 60°. Through the research in this paper, the problems of accidental analysis termination and velocity overrun that often occur in the simulation of shaped energy detonation are solved, which can provide ideas for the research of perforation detonation penetration problems.
Key words
perforating gun /
stuck gun /
blast high /
phase angle /
fluid-solid coupling
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