Study On The Dynamic Response Of Drilling Rig Derricks

Drilling rig derrick is an important part of the rig derrick system.In the process of drilling,the rig derrick is the equipment installation part of hanging block,hook,crown block and job ladder,which is the most difficult in the structural fabrication and the highest in the design requirements in the whole system structure.At the same time,drilling rig derrick's working environment is more complex relative to the general steel structure.Among all the loads which the derrick structure bears,only its weight on the load is static with other loads dynamic.A company usually adopts the method to combine experience and the equivalent static to design the derrick structure,which can satisfy the basic requirement of the derrick structure design,whereas it often leads to the structural weight and design cost increase.So the research on the dynamic responses of the drilling rig derrick which makes structure design more accurate and safety assessment more reasonable,is of great significance.In view of the company products of this article,the drilling rig derrick dynamic response is studied by using ANSYS software research,which mainly makes the following findings:?1?The load condition which the drilling rig derrick structure bears is analyzed.It determines the rig derrick system for finite element calculation of actual load condition and formulate a load condition through the field investigation and the literature,which lays a foundation for the system to carry on finite element analysis such as static analysis,dynamic analysis and structure optimization.?2?The modal and harmonic response of the drilling rig derrick structure are analyzed.The modal analysis of the rig derrick system is mainly on the natural frequency and the main vibration mode.The harmonic response analysis gets response near the natural frequency under the simple harmonic load through the frequency domain analysis.The results show that the second natural frequency occurs resonance easily,while it can be adjusted to avoid by adapting the drilling speed;The modal and harmonic response analysis results are consistent with rig the practical work situation of the drilling rig derrick.The results show that the analysis is correct,which provides the reference basis for selecting matching drill rig,fault diagnosis and forecast,improvement and dynamic optimization.?3?The transient response of drilling rig derrick structure is analyzed.It respectively studies the transient response under the condition of impact hook load and impact hook load and wind load coupling,which chooses the finite element modal analysis parameters and boundary conditions based on the modal analysis.The results show that the drilling rig derrick structure design meets the API₄F standard requirements;Under the condition of wind load,the whole rig derrick structure vibrates more intensely while whether there is the wind load,the rig derrick structure always bears pressure in the y direction and tension in z direction.It provides referential basis for the drilling rig derrick structure design and the safety assessment to apply the actual dynamic load to the drilling rig derrick system for transient analysis.?4?The seismic spectral response of the drilling rig derrick structure is analyzed.It has carried on the seismic spectral response analysis,which is on the basis of the modal analysis of the drilling rig derrick structure system.The results show that the drilling rig derrick structure's spectrum response values change under earthquake excitation is reasonable,conforming to the requirements of the American API₄F standards,which provides a reference for the study of the seismic theory and engineering design of the drilling rig derrick system.