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To solve the problems of low drilling efficiency in Tarim piedmont region, the first 9000m quadruple stand drilling rig with independent intellectual property rights has been developed [1]. Quadruple stand drilling rigs use the quadruple stands instead of the convention triple ones, an auxiliary racking board is installed and the height of derrick and racking board are increased at the same time. The net height of the derrick increases from 48m to 57.5m. The super high derrick will lead to the increase of load on the derrick, which cannot meet the requirements of strength and stiffness. Whether it is drilling or sticking accident, the vibration of derrick under the maximum static load is very dangerous. These vibrations will cause damage to drilling platform equipment and downhole tools, affect drilling speed, shorten the service life of drilling rigs, and reduce the safety of drilling operations. In addition, the derrick will be subjected to impact loads such as "quick lifting" and "sudden braking" in the process of tripping and drilling, while the static calculation cannot analyze the impact of these dynamic loads [2]. Therefore, it is necessary to carry out dynamic analysis of the derrick of quadruple stand drilling rigs, and study the variation of derrick structure response with frequency and transient impact load. The dynamic response of derrick can be determined.

Dynamic Analysis for Derrick of Quadruple Stand Ultra-Deep Well Drilling Rig