Research on stability of deepwater drilling riser system in freestanding mode

Yang, Jin; Li, Lei; Yang, Yuxiang; Zhang, Minghe

doi:10.1016/j.oceaneng.2023.114439

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…In turn, the recommended safe operating time, s operating condition window and BOP trolley design restraint reaction force resu throughout the year are given. At the same time, the following assumptions are made facilitate the solution of the finite element model: (1) the landing string is an isomet slender rod, ignoring the effects of joints and section changes; (2) the material of the pi column is linear elastic, homogeneous and isotropic; (3) the top of the string is connect to the platform, and the bottom is regarded as the free end, ignoring the influence of t platform movement on the string.…”

Section: Stage Analysismentioning

confidence: 99%

“…During casing operation of drilling without riser section in the deep-water surfa the lower part of the landing string is connected with the running tool and casing [2 The operating water depth is limited to 1600 m, and the casing running process can divided into three stages: casing entering water, drill pipe carrying casing into water, a drill pipe carrying casing entering the wellhead, shown in Figure 2. The finite element models of the three stages are shown in Figure 3.…”

Section: Stage Analysismentioning

confidence: 99%

“…During casing operation of drilling without riser section in the deep-water surface, the landing string is in contact with the sea water, and bending deformation occurs under the action of wind force, sea current force and wave force [1][2][3]. The upper part of the string is connected to the drilling platform, and the deformation of the string cannot be reduced by changing the top tension [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Loads Calculation and Strength Calculation of Landing String during Deepwater Drilling

et al. 2023

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As an important drilling tool, the landing string will be directly exposed to seawater during surface riserless drilling operations, and it will undergo complex deformation under the action of environmental loads such as ocean currents and waves and the displacement, heave and vibration of the drilling platform. At the same time, with the increase in water depth, the floating weight of drill pipe and casing also increases significantly, and the landing string will bear great tensile loads, which can easily cause accidents. Therefore, in this paper, based on ANSYS software, the finite element analysis models of three stages of the landing string lowering operation were established, and finite element simulations under different combinations of working conditions were carried out. Through theoretical analysis and numerical simulation, the ultimate load and stress distribution of the string under different operating sea conditions were obtained, and the external force requirements for restraining the lateral displacement of the string were proposed according to the existing standards of the industry. Thereby, the recommended safe operating time, safe operating conditions window and the required restraint reaction force of the support mechanism are given for landing string lowering operation throughout the year.

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Section: Stage Analysismentioning

confidence: 99%

Section: Stage Analysismentioning

confidence: 99%