K型石油钻机井架瞬态研究

Study on Transient Response of K-type Oil Drilling Rig Derrick

根据钻机井架实际工作情况建立井架振动模型,通过测试实验得到动态载荷,应用ANSYS软件对K型钻机井架进行瞬态响应分析。研究结果表明:在动载荷作用下,钻机井架各部分变化具有同时性,而达到最大值的时刻不同,说明井架响应具有滞后性;井架以上下振动为主,同时具有一定程度的扭振;位移变化主要发生在井架顶部,而扭转振幅从顶端向下逐渐减弱;最大振动位移、最大弯矩、最大应力分别为108.33 mm、80990.8 N·m、-0.16354E+09Pa,均满足设计要求。在瞬态振动过程中,振动衰减最快的是扭转,而X向、Y向、Z向振动位移中X向衰减最快,这与实际情况一致。因此,运用实际动载荷对井架进行瞬态分析为井架结构设计以及安全评估提供了参考依据。

According to the actual working conditions, the rig derrick vibration model is established and the dynamic load is obtained by testing experiments. Transient response analysis is made on K - type drilling rig derrick with ANSYS software, the results indicate that the variation of each part of the rig derrick has the character of simultaneity under the effect of dy- namic load, yet the moments to achieve maximum value is different, which shows the lag of derrick response. The derrick is mainly on up-down vibration with a certain degree of torsion vibration. Displacement occurs mainly on the top of the der- rick, while the torsion amplitude decreases gradually from top to bottom. The largest vibration displacement 108.33mm, the maximum bending moment 80990. 8N · m and the maximum stress -0. 16354E ＋ 09Pa satisfy the design requirements respectively. In the process of the transient vibration, torsion vibration attenuation is rapid; while X direction decay is the fastest among X, Y and Z directions, which is consistent with the actual situation. Therefore, the transient analysis on der- rick by using the actual dynamic load provides reference basis for the derrick structure design and safety assessment.