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动态负压射孔中通过快速吸收井筒内的残余爆轰能量和液柱压力,使井筒内压力在射孔后瞬间下降,在射孔孔道内部与出口之间产生巨大瞬间压力差.在此压力差作用下,孔道内的射孔压实带和碎屑被高速气流冲洗出孔道.本文通过建立射孔孔道碎屑冲洗输送的数值模型,模拟了碎屑的输运过程.研究了动态负压、碎屑的几何分布等参数对碎屑输运效果的影响.数值结果表明:碎屑输运时间主要集中在压力下降阶段;最大动态负压值越大,最大动态负压出现时间越迟,碎屑输运效果越好.数值结果对指导动态负压射孔工艺设计具有一定指导意义.
Dynamic negative pressure perforation through the rapid absorption of residual wellbore detonation energy and liquid column pressure, the wellbore instantaneous pressure drop in the perforation, the perforation channel between the outlet and the huge instantaneous pressure difference between the pressure Under the poor action, the perforation compaction zone and debris in the tunnel were flushed out of the tunnel by the high-speed airflow.In this paper, the numerical simulation of the transport of debris was established by setting up the numerical model of the flushing transport of the perforation tunnel, and the dynamic negative pressure , The geometric distribution of debris and other parameters on the impact of debris transport.The numerical results show that: the debris transport time mainly in the pressure drop stage; maximum dynamic negative pressure value, the maximum dynamic negative pressure appears later, The better the transportation of debris.The numerical results have some guiding significance for the design of dynamic negative pressure perforating process.