Dynamic behavior and failure analysis of perforating string under explosive load

Abstract

Perforation in oil and gas wells can cause severe impact vibration of perforating string systems, which can even lead to the buckling of tubing, breaking of joints, and damage of packers. This study focuses on the dynamic behavior and failure analysis of perforated strings. A dynamic analysis model of perforating strings that couples transverse, longitudinal, and torsional vibrations was first established. The finite element method was used to discretize the perforating string into beam elements, and the Newmark-β method was used to solve the model. A field well was used as an example to prove the correctness of the model. The dynamic behavior of the perforating string at actual scale under the action of the explosive load was discussed. The effects of perforating parameters and string structure on the safety performance of the perforating string were analyzed. The results obtained can provide scientific guidance for the field perforating operation.