WTZ350 物探钻机井架平面内稳定性研究

STUDY ON IN-PLANE STABILITY OF THE WTZ350 GEOPHYSICAL RIG'S MAST

首先以薄壁构件拉压弯扭理论为基础建立钻机井架平面内稳定性计算模型,根据能量法和势能驻值原理对井架进行了平面内稳定性理论计算和数值模拟验证,数值模拟与理论计算结果基本吻合。然后对5种常用结构钢井架进行了材料非线性分析。结果表明:5种结构钢井架在提升钻进过程中发生线性屈曲时井架薄壁的最大应力超过了材料的屈服强度,失稳类型为弹塑性失稳;弹塑性失稳安全系数y随着材料屈服强度x的增大而增大,线性拟合函数关系为y=0.007 07x-0.016 51;屈服强度大于313.5 MPa的钢材料满足井架平面内弹塑性稳定性要求。

In-plane stability calculation model of mast was set up firstly based on the thin-walled components flexuraltorsional theory. Theoretical arithmetic,according to the energy method and principle of stationary potential energy,and numerical simulation and verification of the derrick＇s in-plane stability were conducted,and the results of theoretical calculation and numerical simulation basically tallied. Then,material nonlinear analysis was conducted on 5 kinds of structural steel masts.Results show that： maximum stress of the thin-walled derrick exceeds the yield strength of the material when linear buckling occurs in the lifting drilling process for the 5 kinds of structural steel masts and the type of instability is elastic-plastic buckling;The elastic-plastic buckling safety factor y becomes larger with the increasing of yield strength of materials,and the linear fitting function is y = 0. 00707x- 0. 01651; The steel materials that whose yield strength is greater than 313. 5 MPa meet the requirements of derrick＇s in-plane elastic-plastic stability.