Marine drilling riser is subject to complicated environmental loads which include top motions due to mobile offshore drilling unit (MODU), wave loads, and current loads. Cyclic dynamic loads will cause severe fatigue accumulation along the drilling riser system, especially at the subsea wellhead (WH). Statoil and BP have carried out a comprehensive model test program on drilling riser in MARINTEK's Towing Tank in February 2015. The objective is to validate and verify software predictions of drilling riser behavior under various environmental conditions by the use of model test data. Six drilling riser configurations were tested, including different components such as upper flex joint (UFJ), tensioner, marine riser, lower marine riser package (LMRP), blow-out preventer (BOP), lower flex joint (LFJ), buoyancy elements, and seabed boundary model. The drilling riser models were tested in different load conditions. Measurements were made of microbending strains and accelerations along the riser in both in-line (IL) and crossflow (CF) directions. Video recordings were made both above and under water. In this paper, the test setup and test program are presented. Comparisons of results between model test and RIFLEX simulation are presented on selected cases. Preliminary results show that the drilling riser model tests are able to capture the typical dynamic responses observed from field measurement, and the comparison between model test and RIFLEX simulation is promising.

References

References
1.
Reinås
,
L.
,
Russo
,
M.
, and
Grytøyr
,
G.
,
2012
, “
Wellhead Fatigue Analysis Method: The Effect of Variation of Lower Boundary Conditions in Global Riser Load Analysis
,”
ASME
Paper No. OMAE2012-83314.
2.
Tognarelli
,
M.
,
Taggart
,
S.
, and
Campbell
,
C.
,
2008
, “
Actual VIV Fatigue Response of Full Scale Drilling Risers: With and Without Suppression Devices
,”
ASME
Paper No. OMAE2008-57046.
3.
McNeill
,
S.
,
Agarwal
,
P.
,
Kluk
,
D.
,
Bhalla
,
K.
,
Young
,
R.
,
Burman
,
S.
, and
Denison
,
S. E.
,
2014
, “
Subsea Wellhead and Riser Fatigue Monitoring in a Strong Surface and Submerged Current Environment
,”
Offshore Technology Conference
, Houston, TX, May 5–8,
SPE
Paper No. OTC-25403-MS.
4.
Grytøyr
,
G.
,
Hørte
,
T.
, and
Lem
,
A. I.
,
2011
, “
Wellhead Fatigue Analysis Method Rev 01
,” Det Norske Veritas, Oslo, Norway, Technical Report No. 2011-0063/12Q5071-26.
5.
DNV GL
,
2015
, “
Recommended Practice DNVGL-RP-0142 Wellhead Fatigue Analysis
,” Det Norske Veritas, Oslo, Norway, Technical Report No. DNVGL-RP-0142.
6.
Reinås
,
L.
,
Sæther
,
M.
, and
Svensson
,
J.
,
2012
, “
Wellhead Fatigue Analysis Method: A New Boundary Condition Modelling of Lateral Cement Support in Local Wellhead Models
,”
ASME
Paper No. OMAE2012-83049.
7.
Russo
,
M.
,
2014
, Personal Communication.
8.
MARINTEK
,
2012
, “
RIFLEX Theory Manual, 4.0v0 ed.
,” MARINTEK, Trondheim, Norway.
9.
MARINTEK
,
2014
, “
SIMA User Guide
,” MARINTEK, Trondheim, Norway.
10.
Faltinsen
,
O. M.
,
1993
,
Sea Loads on Ships and Offshore Structures
(Cambridge Ocean Technology Series),
Cambridge University Press
,
Cambridge, UK
, pp.
223
227
.
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