Study on C-type Frame based on Drilling Derrick Pin Disassembly Mechanism

Author(s): Changbiao Yang, Feifan Xu, Haihong Li, Xuemei Jin, Yinghui Zhang

In oil and gas exploitation, the derrick is used to place the crane, hanging carriages, as well as carrying a variety of heavy equipment.The derrick mainly contains the body of the derrick, the crossbeam, and the tension bar, which are connected together by the pin shaft.After drilling operations, the derrick pin needs to be removed manually.However, due to the high operational risk and high cost of pin removal.Therefore, there is an urgent need to find a safer method for pin removal.In this paper, a new method of safe pin disassembly is proposed.After lifting the robotic arm and the pin ejector mechanism to a specified position by using a lifting device, the robotic arm is connected to the pin ejector mechanism by quick-change and arrives at the specified operating position, and the pin ejector mechanism is activated to eject the pin.Since the robotic arm and lifting device are standardized products, their reliability meets the requirements.However, the C-frame in the ejector mechanism is mainly used to counteract the reaction force of the pin on the ejector mechanism, and the reliability of this structure has a direct impact on the entire workflow.Therefore, In this paper, the reliability of C type is verified from two aspects of stress and deformation by static analysis.Then, the C-frame structure is topologically optimized, and the optimized structure not only meets the reliability requirements but also achieves the weight reduction of the mechanism.This research further promotes the construction of smart oilfields and can also provide reference value for other engineering fields.

Derrick Pin Shaft, Automatic Disassembly, Ejection Mechanism, Topology Optimization

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