Case Study 2615 Polar Pioneer BOP

Polar Pioneer – New Wellhead Spider

Rig Name: Polar Pioneer
Rig Type: Semi-Submersible
Owner name: Transocean Inc.
Classification Society: DNV
Code design: WSD

Model 3D
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Project description
Search out a solution to house the existing generic type wellhead connector using the same basic framework but replacing the inner core with a new bucket specifically to suit Vetco H4 with smaller diameter. In addition to this, it was requested that an option for dismantling the wellhead connector be accommodated without having to separate the wellhead spider frame from the lower main frame. Design concept consists of one horizontal supporting ring to take the loading from the connector component and this load is taken up by the diagonal framing with 4 pin connections. This is to facilitate offshore quick change out of the connector.

Model of Geometry

Existing System

Load Path and Stress Contours

R.E. Scope of work
Structural FEA model of the proposed spider lower frame was made using Finite Element Assessment Software, ROBOT, provided by Autodesk. Pins and padeyes, the main, critical part of the design have also been evaluated using empirical and FEA means. Assessments have been done and the stresses in the critical areas are found to be within allowable limit of both the operating and accidental conditions. Workshop drawings depicting new design elements have been included to the design pack for solution implementation.

Engagement Condition
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Key word: Rig Engineering, Polar Pioneer, BOP Modification, Wellhead Spider, Spider Frame, Wellhead Connector, Wellhead Bucket, Bottom Entry Bucket, Quick Wellhead Connector Change Out