The deal is worth about NOK 420m ($70.85m)in total and delivery will take place in mid-April 2015.
The hulls of the UT 755 LC ships will bebuilt in Poland and outfitted in Norway.
They have been designed by Rolls-Royce.
Scottish owner Fletcher Shipping has ordered two platform supply vessels (PSVs) from Simek in Norway.
The deal is worth about NOK 420m ($70.85m)in total and delivery will take place in mid-April 2015.
The hulls of the UT 755 LC ships will bebuilt in Poland and outfitted in Norway.
They have been designed by Rolls-Royce.