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Research Papers: Offshore Technology

An Experimental Approach for the Offshore Launching of Jack-Ups

[+] Author and Article Information
Claudio A. Rodríguez

LabOceano, Department of Naval Architecture
and Ocean Engineering,
COPPE – Federal University of Rio de Janeiro,
Caixa Postal N° 68.508,
CEP 21945-970 Rio de Janeiro, RJ, Brazil
e-mail: claudiorc@laboceano.coppe.ufrj.br

Mário Moura

Consórcio Rio Paraguaçu,
Caixa Postal N° 41,
CEP 44400-970 Nazaré, BA, Brazil
e-mail: mario.moura@eepsa.com.br

Paulo T. T. Esperança

LabOceano, Department of Naval Architecture
and Ocean Engineering,
COPPE – Federal University of Rio de Janeiro,
Caixa Postal N° 68.508,
CEP 21945-970 Rio de Janeiro, RJ, Brazil
e-mail: ptarso@laboceano.coppe.ufrj.br

Jacques Raigorodsky

Odebrecht,
Av. das Nações Unidas,
8501 - 32° Andar, Pinheiros,
CEP 05425-070 São Paulo, SP, Brazil
e-mail: jacquesraigo@odebrecht.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 30, 2013; final manuscript received December 28, 2013; published online March 18, 2014. Assoc. Editor: John Halkyard.

J. Offshore Mech. Arct. Eng 136(2), 021301 (Mar 18, 2014) (10 pages) Paper No: OMAE-13-1074; doi: 10.1115/1.4026478 History: Received July 30, 2013; Revised December 28, 2013

Recently, as part of the building contract for the new Brazilian jack-up drilling platforms, an operational challenge was raised: to launch these units from the building site, where neither dry dock nor launching ground ways exist. Economically, the best alternative was to launch these jack-ups using the available barges used commonly for jacket launch. Due to the marked differences between a jacket and a jack-up, the implementation of this novel launch operation required a careful feasibility study. Model tests were required to measure the motions of the barge and the jack-up and to evaluate the loads on the barge rocker arms. The present paper discusses the experimental approach, test setup, calibration procedures, and some results from the hydrodynamics perspective.

Copyright © 2014 by ASME
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References

Figures

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Fig. 1

Test setup for stage 1

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Fig. 2

Test condition 1, stage 1

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Fig. 3

Test setup for stages 2 and 3

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Fig. 4

Test condition 1, stages 2 and 3

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Fig. 5

Test setup for stage 4

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Fig. 6

Test condition 1, stage 4

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Fig. 7

Pitch inertia measurement in the pitching table

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Fig. 8

Friction coefficient measurement setup

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Fig. 9

Contact surface of the jack-up cradle

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Fig. 10

Longitudinal acceleration along ground ways

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Fig. 11

Friction coefficient along ground ways

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Fig. 12

Effect of FRC on pitch—ground ways launch

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Fig. 13

Effect of FRC on heave—ground ways launch

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Fig. 14

Effect of FRC on the trajectory—ground ways launch

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Fig. 15

Effect of INC on pitch—ground ways launch

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Fig. 16

Effect of INC on heave—ground ways launch

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Fig. 17

Effect of POS on pitch—ground ways launch

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Fig. 18

Barge launch versus ground ways launch

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Fig. 19

Effect of LCG on pitch—barge launch

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Fig. 20

Effect of LCG on heave—barge launch

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Fig. 21

Effect of INC on pitch—barge launch

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Fig. 22

Effect of INC on relative pitch—barge launch

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Fig. 23

Effect of FRC—barge launch

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