TY - JOUR
T1 - Perforation drilling for easing spudcan-footprint interaction issues
AU - Hossain, Muhammad
AU - Staniforth, Ryan
PY - 2016/2/1
Y1 - 2016/2/1
N2 - © 2016 Elsevier Ltd. All rights reserved. The interaction between a spudcan and an existing footprint is a major concern during jack-up rig installation. No guidelines were provided in the recently finalised version of ISO guidelines 19905-1 in regards to mitigating spudcan-footprint interaction issues except some proposed considerations due to scarce of detailed investigation. This paper reports a measure for easing spudcan-footprint interaction issues, with the efficiency of perforation drilling tested through model tests carried out at 1 g. The soil conditions tested simulate soft seabed strength profiles close to the mudline, varying the undrained shear strength. The most critical reinstallation locations of 0.5D and 1D (D=spudcan diameter) and existing footprint depth of 0.33D were investigated. The removal of soil (through perforation) inside the spudcan perimeter, with an area of 9% perforated, reduced the induced maximum moment, horizontal force, and horizontal sliding distance by up to 80%, 83%, and 76% respectively.
AB - © 2016 Elsevier Ltd. All rights reserved. The interaction between a spudcan and an existing footprint is a major concern during jack-up rig installation. No guidelines were provided in the recently finalised version of ISO guidelines 19905-1 in regards to mitigating spudcan-footprint interaction issues except some proposed considerations due to scarce of detailed investigation. This paper reports a measure for easing spudcan-footprint interaction issues, with the efficiency of perforation drilling tested through model tests carried out at 1 g. The soil conditions tested simulate soft seabed strength profiles close to the mudline, varying the undrained shear strength. The most critical reinstallation locations of 0.5D and 1D (D=spudcan diameter) and existing footprint depth of 0.33D were investigated. The removal of soil (through perforation) inside the spudcan perimeter, with an area of 9% perforated, reduced the induced maximum moment, horizontal force, and horizontal sliding distance by up to 80%, 83%, and 76% respectively.
UR - https://www.scopus.com/pages/publications/84955239966
U2 - 10.1016/j.oceaneng.2016.01.002
DO - 10.1016/j.oceaneng.2016.01.002
M3 - Article
SN - 0029-8018
VL - 113
SP - 308
EP - 318
JO - Ocean Engineering
JF - Ocean Engineering
ER -