震击器向上震击动载荷计算

CALCULATION OF DYNAMIC LOADING FOR BUMPER JAR JARRING UPWARD

在钻井施工作业中,卡钻事故时有发生,采用震击工具可以有效地解卡,如何准确地计算震击时的动载荷是震击作业的一项重要内容。关于震击动载荷的计算说法不一,本文根据震击器上击器的工作原理,应用动力学分析方法,建立了向上震击作用中钻柱的动力学方程,分析了震击作用时弹性波在钻柱中的传播情况。计算的实例表明,该模型更加贴近实际,同时本文提出震击器的安放位置不同将极大程度地影响震击效果,对震击器的安放位置进合理的设计非常重要。

During drilling works sticking of a tool is often occurred. Jarring tool may use to unfreeze effectively, So how to calculate the dynamic Ioading accurately in jarring is an important work in jarring. It is not agreement with dynamic loading calculation in books. Based on top jar works principle this paper uses dynamics analysis method for establishing drill stem's dynamics equation in jarring upward and analyzes the elastic wave propagation within drill stem when jarring is acting. The calculated result indicated that the model was much more close to practice and provided the different jar location will affect jarring result seriously, So it is very important for rational design jar location.