Finite Element Analysis And Stability Study On Key Parts Of Workover Rig Without Guy Line

After a long period of pumping oil wells, the bottom tubing hole of the will be plugged. We need to clean tubing, the first few hundred meters of tubing must be draw out from the oil wells. Workover rig is the oil wells tubing upgrade equipment. In order to ensure workover rig operations reliable , stable whole vehicle safety, we must fight four guy wire . Most of the machines current use guy wire oil rigs, workover rigs no guy wire is just in the rise of oil machinery . Ensure without guy wire workover rig safe, reliable and stability is difficult to develop without guy wire workover rig and key technologies. Study The information about workover rig at home and abroad to design and calculate ,understanding the history and development trends of workover rig and its . Analysis of the basic parameters and structure of the derrick, meantime Analysis of analysis of lifting equipment .it do design, analysis , research of Derrick and the stability of whole vehicle.First discusses Derrick and the corresponding some principles of design, Next, introduction of the tower popular Derrick, before the opening Derrick and the three-shaped derrick . In addition, further informa the parameters of the derrick, Derrick basic parameters including maximum hook Load , height of the derrick, such wind resistance capacity of derrick and theoretical Weight. calculation regulateing of Derrick such as the stress requirements and stability requirements , Derrick method of calculating , Derrick structure design Mainly considered two basic variables : First, the structure of the load effects : the load on the structure, such as axial force, bending, shear, torque, etc. Second, the structure of resistance, Structural load bearing capacity and deformation ,such as Section stress and stiffness etc, loads on Derrick and calculate the , Derrick bear the main load include the work load, natural load, load installation, dynamic load the momentum Derrick . Finally, the design principle for a preliminary discussion of derrick , such as the derrick structure, the structural characteristics of the structure and scope of application. put forward two design project about No guy wire against 30 tons. According to the characteristics of different two design project, selected object of the with a certain angle design.Base this object , analysis of Derrick stress under maximum load, rated load and wind load the three conditions, Modal analysis was also conducted , Given the previous four modes of natural frequencies and mode shapes, based on Derrick modal analysis the stiffness of the derrick and forced vibration .Analysis guy wire workover rig can be found near the oil well of two of the underpinning is a weak vibration part, forced vibration is sensitive parts.But the vibration frequency is lower than the natural frequency of Derrick,so it is not resonance .Meantime, optimize fixed rope, activity rope and Derrick angle base MATLAB. Come to a group of the best values, Compare stress and displacement of Derrick base on Best value-based layout with current Derrick, Found stress and displacement of Derrick base on Best value-based layoutis smaller then current Derrick. Displacement is the only displacement of current Derrick by 31%. Finally,study the stability of derrick , study the stability of derrick Composed of three parts , Derrick's Local Stability, Derrick's overall stability , workover rigs no guy wire whole vehicle's stability. In order to study the stability and bearing no guy wire Derrick, Make flexure analysis to the derrick. Through flexure analysis , It is precisely because of fixed rope, activity rope and Derrick angle optimization results , Derrick with certain angle has that characteristics of the derrick hook load and the frequency's square of the correspondence load is linear relationship . In addition, study Derrick base on ANSYS under defects and defect-free in both cases. Make the results of the comparative analysis found that capability of derrick under first defects is not big change , defects and defect-free curve are same ,but second defects curve under first defects and defect-free curve.under same load, eigen value under second defects is smaller than under first defects and defect-free.bearing capability of derrick is debased under second defects.from structure perspective , derrick beams seriously influence stability of the bearing bearing capacity of derrick . study on whole vehicle stability at end of his paper, stability coefficient of the whole Vehicle stability is 4.1 , whole vehicle stability meet request that workover rigs need stability when it work.