Project: Liuhua11-1/4-1 Oilfields Continued Development Project

Time of completion:  Sep 2024

Project introduction: Liuhua11-1/4-1 oilfields are located in the Pearl River Mouth Basin. Liuhua11-1 oilfield is located in about 220km southeast of Hong Kong, of which the water depth is about 305-324m. Liuhua4-1 oilfield is located in about 215km of Hong Kong, of which the water depth is about 260-300m. The main facilities consist of the following:

A new 4 legs fixed LH11-1 DPP (“Haiji-2”), Water Depth:324m

A new 60,000 tons cylindrical LH11-1 FPSO (“Haikui No.1”), Water Depth:312m

One flexible pipeline and subsea cable from LH11-1 DPP to LH11-1 FPSO

One flexible pipeline from existing bridging manifold to LH11-1 DPP

Existing LH4-1 subsea cable tie back to LH11-1 DPP by lengthening

Existing LH4-1 umbilical rebuilt and tie back to LH11-1 DPP

Project highlights: Liuhua11-1/4-1 Oilfields Continued Development Project is the first project combining a deepwater fixed platform with cylindrical FPSO with average water depth of 320m in the world, which is accomplished by COOEC as the EPCI contractor independently.
The total weight of LH11-1 DPP Platform is over 50,000 tons. The deepwater jacket “Haiji-2” is nearly 37,000 tons with water depth of 324m, which is No.7 of the world deepwater jacket. A digital Health Management System is applied in “Haiji-2”, which will be used for daily inspection and maintenance of substructure after the platform being in-service.
The total weight of LH11-1 cylindrical FPSO(“Haikui No.1”) is nearly 37,000 tons with water depth of 312m, which is No.3 of the world cylindrical FPSO.
These two facilities both have a 30-year design fatigue life and could survive from ultra-strong typhoon once-in-a-century.