Load Monitoring at the Touchdown Point of the First Steel Catenary Riser Installed in a Deepwater Moored Semisubmersible Platform

Edwards, Roderick Y.; Machado, R.Z.; Hennessy, William; Campman, C.R.; Bailon, Hector

doi:10.4043/10975-ms

Cited by 5 publications

(2 citation statements)

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“…Instrumentation systems have progressed a long way since the early systems deployed on the P18 steel catenary riser [2] and the field tow test conducted for the STRIDE joint industry project [3]. Instrumentation systems have progressed a long way since the early systems deployed on the P18 steel catenary riser [2] and the field tow test conducted for the STRIDE joint industry project [3].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Wellhead Fatigue

2015

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Fatigue loading on subsea wellheads has been increasing in recent years through the use of larger and heavier BOP stacks and the longer drilling durations needed for deeper wells and to extend production lives. This challenge has prompted the widespread implementation of monitoring systems to confirm predictions of wellhead fatigue and ensure well operations are conducted safely. Monitoring system design requirements, data processing and evaluation of field measurements from a number of wells are described.Monitoring systems for measurement of wellhead fatigue require careful planning. Considerations include what to measure, instrument accuracy, power, data transmission, methods of attachment, data processing and data storage. The evaluation will determine the suitability of off-the-shelf equipment or the need for application specific devices. An example assessment of the requirements of measurement devices from which wellhead fatigue can be derived is given that demonstrates the importance of integrated consideration of instruments, resolution and data processing methods in the selection and design of the system. The assessment presented here has widespread application across subsea wellhead systems worldwide.A variety of different approaches to monitoring wellhead system fatigue have been attempted. These include motion measurement, using devices located in varying positions along the wellhead and BOP, to strain measurement of the conductor pipe. Examples of real systems used in different geographical locations and the wellhead system fatigue damage derived from the data are presented. The improved understanding of wellhead behaviour and modelling improvements that can be made from the use of the data obtained are demonstrated. Finally, comparisons of response measurements from different devices demonstrate the importance of instrument positioning. This finding provides a driver for the design of future instrumentation systems and an important pointer for verification of wellhead fatigue damage derived from previous monitoring programs.The work presented here provides a systematic basis for design and implementation of wellhead fatigue monitoring systems. Furthermore, the field measurements obtained demonstrate some potential pitfalls to be avoided and how to get maximum value from the data obtained.

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Section: Introductionmentioning

confidence: 99%

Measurement of Wellhead Fatigue

2015

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In August 1998, a 10-inch Steel Catenary Riser (SCR) was installed on the Petrobras XVIII semi-submersible production platform, moored in 910 meters water depth in the Marlim field, Campos Basin, offshore Brazil [1]. The TDP monitoring system was described in Edwards 1999 [3]. The TDP monitoring system was described in Edwards 1999 [3].

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confidence: 99%

Acoustically Linked, Remotely Operated Vehicle Deployable, Subsea VIV Measurement System on XVIII: Development, Testing, Deployment and Results.

et al. 2001

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In August 1998, a 10-inch Steel Catenary Riser (SCR) was installed on the Petrobras XVIII semi-submersible production platform, moored in 910 meters water depth in the Marlim field, Campos Basin, offshore Brazil [1]. This was the first SCR ever installed on a floating moored platform.In order to evaluate and verify the methodologies and to calibrate the numerical models used in the riser, mooring system and platform design, it was necessary to establish a monitoring program for all the relevant parameters (environmental, platform positions and motions, riser loads and stresses at the top and at the touch down point (TDP) and vortex induced vibrations) [2]. The TDP monitoring system was described in Edwards 1999 [3]. In February 2000, the Vortex Induced Vibration Monitoring System (VIVMS) was added for measuring and recording vibrations of the SCR induced by flow and by the motions of the semi-submersible platform P XVIII. This paper describes the VIVMS, which was developed to measure, at up to four locations along the SCR, accelerations in three orthogonal directions and angular rates in two directions. The system records this information locally in subsea enclosures, transmits it to the surface on command and includes the software to transform the riser fixed accelerations and rates to earth fixed linear and angular velocities and displacements.

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