Design and Overall Strength Analysis of a Deepwater Medium-Sized Workover System
The medium-sized workover system can achieve a balance between service type and cost in work-over operations,and is the future development trend of deepwater subsea wellhead workover operations.Based on light engineering vessels,an integrated design of deepwater medium-sized workover system for subsea wellhead was proposed.The main components such as the bottom assembly,workover riser and lift frame were introduced in de-tail,an overall dynamic analysis model for the deepwater medium-sized workover system was built,and the finite element method was used to analyze the strength response of the system.The results show that the deepwater medi-um-sized workover system can provide a fluid flow channel for deepwater workover,and allow workover fluid and coiled tubing to conduct workover operation in the channel of the workover riser.As the offset of light work vessel increases,the equivalent stress and bending moment at the tapered stress joint increases correspondingly;and the maximum bending moment and equivalent stress of the whole workover system occur at the bottom of the tapered stress joint,so the subsequent design should focus on the stress condition at the bottom of the conical stress nipple.The research findings provide reference for the development of deepwater workover equipment and technology and their safe application in deepwater oil and gas fields.
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