Finite Element Analysis And Stability Study On A Kind Of Workover Rig Without Guy Line

The workover rig, an important equipment of repairing well and exploiting oil, plays a vital role in increasing national oil output and enhancing economic benefits. With the improvement of oil industries, it needs the workover rig work more efficient and lower cost. The workover rig without guy line studied in this paper has an important engineering practical value. In the background of no guy line self-workover rig design and research which is a project with Liaohe Oil Company, the designing methods of the no guy line workover rig is deeply studied, and the safety under the condition of Static and dynamic loads and the stability of the product is analyzed.On the base of collecting of the information of designing, analyzing, and using materials about self-workover rig in the world, the designing standard of rig is discussed. The plan of workover rig without guy line is presented and the finite element model of this machine is builded. Using the method of FEA, after the static and dynamic analysis of derrick under various typical loads conditions, the static and dynamic stress and displacement evolutional law are obtained, and the design feasibility of the workover rig without guy line is verified.The derrick modal analysis in this paper is based on the method of Block Lanzcos. The inherence frequencies and modes of vibration of derrick are obtained. The results indicate that the derrick will not resonate in condition of the external loads. Furthermore, the derrick's eigenvalue buckling is analyzed and the factors of affecting the bearing ability of derrick is statement. Through the contrasting the effect of these factors, the structural form of derrick is determined. According to the stability demand of this machine, the stability of this product under the working condition is analyzed. By improving the supporting system, the stability coefficient of this product is eligible.By the static and dynamic analysis and contrasting of 90T workover rigs without guy line, the designing method is proved feasible. It has theoretical guidance significance to the workover rigs without guy line design.