An Advanced Measurement System for Vortex-Induced-Vibrations Characterization in Large-Scale Risers

Ordonez, Martin; Sonnaillon, M.O.; Murrin, D.; Bose, Neil; Qiu, Wei

doi:10.1109/oceans.2007.4449233

Cited by 3 publications

(3 citation statements)

References 6 publications

(7 reference statements)

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“…The modular architecture of the system allows increasing the number of modules to achieve higher mapping modes with the additional advantage of low cost per module. A detailed explanation of this advanced measurement system can be found in [7].…”

Section: ) Risermentioning

confidence: 99%

High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser

Murrin

Ordonez

Stone³

et al. 2007

Oceans 2007

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Abstract-During offshore drilling operations, marine risers carry mud and debris from below the sea floor, and during production operations they are responsible for transporting oil or gas from the hydrocarbon reservoir to the surface platform. The integrity of a marine riser is therefore critical to the success of offshore drilling and production.The flow of seawater around marine risers is subject to vortex shedding which excites oscillations known as Vortex Induced Vibrations (VIV). When the VIV frequency approaches one of the natural frequencies of the structure, resonance, or lock-in occurs. This results in enhancement of the vibration amplitude of the structure and may have potentially destructive consequences due to high bending stresses and fatigue damage of the riser. At present, the prediction of this phenomenon is one of the most challenging areas in the offshore industry.In experimental investigations of VIV, large aspect ratio risers, namely long cylinders with relatively small diameters, pose a modeling challenge. This paper focuses on the development of a large-scale model riser capable of transmitting data in real-time under realistic operating conditions.

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Section: ) Risermentioning

confidence: 99%

High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser

Murrin

Ordonez

Stone³

et al. 2007

Oceans 2007

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“…ROVs must keep a safe distance from the riser, giving only a far view of its surface. Sensors can be installed directly over the riser surface to measure strain and motion (Machado et al , 1999; Ordonez et al , 2007), however, these systems present several limitations since most of them are fixed at some specific points and operate connected to data loggers, which are downloaded from time to time. Instrumented pipe inspection gauges (PIGs) can be used for internal riser inspections, but they require oil production reduction or shutdown.…”

Section: Introductionmentioning

confidence: 99%

Development of an underwater riser inspection robot

Santos¹,

Brito²,

Neves³

et al. 2013

Industrial Robot: An International Journal

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PurposeThe purpose of this paper is to describe a new multi‐sensor robotic system designed for riser, mooring lines and umbilical cables in situ underwater inspection. Due to the aggressive operation environment, such structures are susceptible to a broad spectrum of failure causes, such as aging, mechanical, chemical and thermal loads, hydrodynamic stresses, vortex‐induced vibrations and installation or fabrication non‐conformities. Current inspection methods present major risks and inefficiencies, especially as deeper fields are being reached for exploitation.Design/methodology/approachThe SIRIS (In Situ Riser Inspection Robotic System) is designed to reconstruct the actual riser profile and perform non‐destructive tests. The robot is propelled by thrusters to scroll by the outside of the catenary riser. Mechanical, electronic hardware, image acquisition and software/firmware design are described here.FindingsSimulated data from an inertial measurement unit is fused with depth sensor measurements, using a Kalman filter to reconstruct the riser profile, with small localization errors. Laboratory and sheltered waters tests were successfully executed to assess robot subsystems' performance: imaging, leakage, displacement and easiness of operation.Research limitations/implicationsThe robot prototype is designed to operate down to 250 m deep, although the final goal is reaching 3,000 m. Tests offshore, in a real oil production platform, have not been performed up to this moment. In the present version, the robot must be coupled to the riser with the aid of a scuba diver.Practical implicationsThe robot is expected to allow non‐destructive testing in risers that cannot be performed nowadays with the existing tools. The inspecting procedure is easy to operate and does imply any kind of production stopping. More accurate assessment of the riser structural condition can allow extending its life span, thus avoiding early decommissioning.Social implicationsBetter assessment of actual riser facilities status will have great impact on reducing the chance of oil spill episodes and serious environment damage.Originality/valueThe design, construction and evaluation of a robotic tool for non‐destructive riser inspection has been described. A few similar robots exist in literature but none of them is able to reconstruct the actual riser profile.

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“…Such procedures are performed mainly by visual inspection with remotely operated vehicles (ROVs) [2] or autonomous underwater vehicles (AUVs) [3]. In some cases, sensors are installed directly on fixed points of the riser surface to measure strain and riser motion [4]. Other types of nondestructive testing (NDT) techniques can be used, such as magnetic, radiographic, or ultrasound methods [5].…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of Riser Profiles by an Underwater Robot Using Inertial Navigation

Menegaldo

Panzieri

Neves³

2012

Journal of Robotics

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This paper proposes a kinematic model and an inertial localization system architecture for a riser inspecting robot. The robot scrolls outside the catenary riser, used for underwater petroleum exploration, and is designed to perform several nondestructive tests. It can also be used to reconstruct the riser profile. Here, a realistic simulation model of robot kinematics and its environment is proposed, using different sources of data: oil platform characteristics, riser static configuration, sea currents and waves, vortex-induced vibrations, and instrumentation model. A dynamic finite element model of the riser generates a nominal riser profile. When the robot kinematic model virtually scrolls the simulated riser profile, a robot kinematic pattern is calculated. This pattern feeds error models of a strapdown inertial measurement unit (IMU) and of a depth sensor. A Kalman filter fuses the simulated accelerometers data with simulated external measurements. Along the riser vertical part, the estimated localization error between the simulated nominal and Kalman filter reconstructed robot paths was about 2 m. When the robot model approaches the seabed it assumes a more horizontal trajectory and the localization error increases significantly.

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An Advanced Measurement System for Vortex-Induced-Vibrations Characterization in Large-Scale Risers

Cited by 3 publications

References 6 publications

High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser

High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser

Development of an underwater riser inspection robot

Reconstruction of Riser Profiles by an Underwater Robot Using Inertial Navigation

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