Mudmats close to pugmarks

03 October 2016
Mudmats close to pugmarks

"A shallow foundation subjected to a combined VHM loading, located next to a pug mark is a 3D problem for which simplified approaches for analysis do not exist, it requires 3D FE analysis"

"PLAXIS 3D has been successfully used on this project. The analysis performed allowed confidence to be established for the selected location of the mud mat with respect to the pug mark "

"In contrast, a simplified 2D analysis would suggest that the proximity of the mud mat to the pug mark was unacceptable"

J.C. Ballard & N. Charue
Jacket platforms used offshore for oil extraction are generally temporarily supported by mudmats during installation. These platforms are not always installed on virgin seabed but are sometimes located close to features such as pug marks formed by previous deployments of jack-up rigs.
As part of new oil fiels developments on the Deep Continental Shelf, offshore India, it was discovered that in the proximity of the future location of a jack-up rig, the sea bed features large pug marks. In order to test the stability of the mudmat, Jean-Christophe Ballard and Nicolas Charue of Fugro GeoConsulting analysed the case in PLAXIS 3D.

Jacket platforms used offshore for oil extraction are generally temporarily supported by mudmats during installation. These platforms are not always installed on virgin seabed but are sometimes located close to features such as pug marks formed by previous deployments of jack-up rigs. As part of new oil fiels developments on the Deep Continental Shelf, offshore India, it was discovered that in the proximity of the future location of a jack-up rig, the sea bed features large pug marks. In order to test the stability of the mudmat, Jean-Christophe Ballard and Nicolas Charue of Fugro GeoConsulting analysed the case in PLAXIS 3D.

Software: PLAXIS 3D 2012

Location: Deep continental shelf, offshore India

Company: Fugro GeoConsulting Belgium

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