Construction site：WZ 11-1N WHPA oil and gas field is located in the northern gulf of the South China Sea, about 85km offshore from Beihai city and 45 km offshore from Weizhou Island.
The WZ 11-1N platform position is: 108°42′93E，20°48′97N
Working Period：2009.1.7-2009.3.3
Project Overview： The WZ 11-1N platform jacket was a six-leg, monocline truss steel frame structure, weighing about 1750 tons. Jacket piles length 71.54m and 44.52m, piles weight 258 × 6 = 1548T, piles diameter: 2134mm, piles penetration 67m.