Study on Kinetic Energy Conversion of Perforating Shaped Charge Jet in Perforating Completion

The energy of a perforating shaped charge is the cause of transient pressure fluctuations in a wellbore. Based on the law of energy conservation, the energy can be divided into the kinetic energy of a jet, the residual energy of a wellbore, and energy dissipation. The jet kinetic energy is used to penetrate a perforating gun, casing, and formation. The residual energy of a wellbore is used to cause wellbore pressure fluctuations. Based on the fluid–structure coupling principle, a jet penetration model was developed to improve the conversion rate of the jet kinetic energy, reduce the residual energy of a wellbore, protect wellbore safety, and reduce the downhole perforating completion accident. This model took into account a penetrating charge shell, explosive, liner, perforating gun, and casing. Meanwhile, the penetration process and kinetic energy conversion of a perforating shaped charge jet were studied. The obtained results indicated that the kinetic energy conversion of a perforating shaped charge jet is significantly affected by the cone angle of a liner, the thickness of a liner, and explosive mass. The 70°cone angle of a liner, its 1 mm thickness, and the 25 g explosive mass have the maximum kinetic energy conversion in the research range.