Numerical Computation of Wellbore Dynamic Pressure during Perforating

C. Li, Ming-yong Ma
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引用次数: 2

Abstract

The wellbore dynamic pressure waves are produced in the perforation liquid after the shaped charges are initiated and then fiercely strike the gunstring, packer, casing and artificial bottom. The impact and damage effect only depend on the amplitude and holding time of dynamic pressures. This paper discusses the simplification of perforators' explosion with gun in the oil well. On the basis of simplification model, the finite element method is applied to compute the wellbore dynamic pressure under different working conditions. The simulation results indicate that peak compression enhances and the duration of platform pressures obviously prolongs with the perforators' amount once detonated increasing. The holding time of platform pressure clearly prolongs with the accretion of perforator's explosive charge mass. The peak compression and holding time of reflection waves decrease with the augment of distance between the end of tubing and artificial bottom. The peak compression and holding time must be lowered if possible to avoid undesirable failures and damage during perforating operation.
射孔过程中井筒动压力的数值计算
聚能射孔液在射孔液中产生井筒动压力波,然后猛烈冲击射孔管柱、封隔器、套管和人工井底。冲击和损伤效应仅取决于动压力的幅值和保持时间。本文讨论了油井射孔器带枪爆炸的简化问题。在简化模型的基础上,应用有限元法计算了不同工况下的井筒动压力。仿真结果表明,随着射孔器起爆次数的增加,峰值压缩增强,平台压力持续时间明显延长。平台压力保持时间随着穿孔装药质量的增加而明显延长。反射波的峰值压缩和保持时间随着油管端距人工底的增加而减小。如果可能的话,必须降低峰值压缩和保持时间,以避免在射孔作业中出现意想不到的故障和损坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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