DYNAMICS OF THE SYSTEM DRILLING RISER-BOP-WELL CASING – WELLHEAD-CASING FATIGUE ANALYSIS

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-07-24 DOI:10.1115/1.4063011

Fabiano Guimarães

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引用次数: 0

Abstract

This paper presents a fully coupled solution in the time-domain, using the finite-differences method to the system of equations that model the dynamic behavior of the riser, blow out preventer and casing strings, when connected for well drilling/completion – the model is suitable to evaluate wellhead fatigue, even when the amplitude of oscillation and accelerations of the BOP are high. Sensibility analysis is used to show the effect of changing the Riser Top Tension to the resulting maximum values of wellhead bending moment and casing stress ranges. For the case where the rig is oscillating around a fixed position and there is no current, using a regular wave, the results show that there are some wave periods for which an increase in the Riser Top Tension reduces the maximum wellhead bending moment and the max casing stress range, therefore increasing fatigue life of the casing and wellhead. The effects of varying the weight of the BOP and soil parameters and the effect of the phase difference between the wave and first order vessel motion are analyzed. The proposed solution can also be used to perform riser and casing analysis during drift-off/drive-off.

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隔水管-井眼-套管-井口-套管系统动力学疲劳分析

本文提出了一种时域完全耦合的解决方案，使用有限差分法对方程组进行建模，该方程组对立管、防喷器和套管柱在连接用于钻井/完井时的动态行为进行建模——该模型适用于评估井口疲劳，即使在防喷器的振荡和加速度振幅较高的情况下也是如此。敏感性分析用于显示将立管顶部张力改变为井口弯矩和套管应力范围的最大值的影响。对于钻机在固定位置附近振荡且没有电流的情况，使用规则波，结果表明，在某些波动周期内，立管顶部张力的增加会降低最大井口弯矩和最大套管应力范围，从而增加套管和井口的疲劳寿命。分析了改变防喷器重量和土壤参数的影响，以及波浪和一阶船舶运动之间的相位差的影响。所提出的解决方案也可用于在起下钻/驱离期间进行立管和套管分析。

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来源期刊

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme 工程技术-工程：大洋

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.