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Abstract <p>To develop a technology of drill pipe fracture and extraction from a well at a depth of more than 5000 m, we performed a numerical study of shock-wave loading of the inner surface of the pipe by the detonation of a special cylindrical charge. Two cases of detonation of the cylindrical explosive charge are considered: plane-front detonation and diverging spherical detonation. The computational model is a layered structure which consists of a cylindrical explosive charge in a copper case, a steel pipe, and drilling mud. The shock-wave impact on the drill pipe is calculated in a three-dimensional formulation using the multicomponent Eulerian approach. The calculations confirmed the possibility of drill pipe fracture in the region of the lock joint. It is shown that shock-wave loading by the plane-front detonation causes much more damage to the pipe than the impact by diverging spherical detonation. The minimum charge length sufficient for drill pipe fracture was determined by additional calculations.</p>

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Computational Modeling of Shock-Wave Loading due to the Detonation of a Cylindrical Explosive Charge in a Drill Pipe

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • V. V. Dotsenko,
  • E. Yu. Emel’yanova,
  • A. G. Neskin,
  • M. V. Nikul’shin,
  • D. V. Petrov

摘要

Abstract

To develop a technology of drill pipe fracture and extraction from a well at a depth of more than 5000 m, we performed a numerical study of shock-wave loading of the inner surface of the pipe by the detonation of a special cylindrical charge. Two cases of detonation of the cylindrical explosive charge are considered: plane-front detonation and diverging spherical detonation. The computational model is a layered structure which consists of a cylindrical explosive charge in a copper case, a steel pipe, and drilling mud. The shock-wave impact on the drill pipe is calculated in a three-dimensional formulation using the multicomponent Eulerian approach. The calculations confirmed the possibility of drill pipe fracture in the region of the lock joint. It is shown that shock-wave loading by the plane-front detonation causes much more damage to the pipe than the impact by diverging spherical detonation. The minimum charge length sufficient for drill pipe fracture was determined by additional calculations.