Load Calculation and Strength Analysis of the Deepwater Landing Drill Pipe-Lowering Operation

Guolei He, Linqing Wang (), Jiarui Wang, Kaixiang Shen, Hengfu Xiang, Jintang Wang, Haowen Chen, Benchong Xu, Rulei Qin and Guole Yin
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Guolei He: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
Linqing Wang: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
Jiarui Wang: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
Kaixiang Shen: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
Hengfu Xiang: College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China
Jintang Wang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Haowen Chen: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
Benchong Xu: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
Rulei Qin: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China
Guole Yin: Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China

Energies, 2024, vol. 17, issue 5, 1-15

Abstract: A landing string is directly exposed to seawater and subjected to significant stresses and complex deformations due to environmental loads such as wind, waves, and ocean currents during the phase in which the drill string carries the casing to the wellhead. Meanwhile, as the water depth increases, the weight of the drill string increases, leading to an increase in the tensile loads borne by the drill string, which can easily cause a risk of failure. Therefore, a quasi-static load calculation model for the deepwater insertion of the pipe column was established. Using the Ansys platform, simulations were conducted for average wind, wave, and ocean current conditions during different months throughout the year. The ultimate loads and stress distributions of the string were derived from theoretical analyses and numerical simulations for different operational sea states, and the suggested safe operating window and desired BOP trolley restraining reaction force for landing strings’ lowering are given according to the existing industry standards. The research findings can help in identifying the potential risks and failure modes of the deepwater landing string under different working conditions.

Keywords: deepwater; landing string; ocean current load; lateral displacement; Mises stress; ultimate tensile load (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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