Deep Sea No.1 deep-water gas field is located about 130 kilometers off the city of Sanya in South China's Hainan Province. [Photo/sasac.gov.cn]
The 115.5-kilometers of undersea pipeline was laid successfully on June 22, a pivotal part of the second phase of the country's Deep Sea No.1 deep-water gas field, according to China National Offshore Oil Corporation (CNOOC).
Located about 130 kilometers off the city of Sanya in south China's Hainan province, Deep Sea No. 1 is the first large-scale and ultra-deepwater gas field independently explored and developed by China.
Conventional undersea pipelines cannot meet the demand for the exploration, exploitation, production and operation of deep-sea gas and oil reserves because of high temperature and pressure as well as the complexity of deep-sea gas and oil ingredients.
Therefore, the CNOOC designed special pipelines, are designed to endure high temperature and pressure, show strong resistance against corrosion, and deliver gas-oil current with a temperature of 120 ℃. The maximum thickness of the newly developed pipelines is about 38 millimeters.
The completion of the deep-water gas-oil pipelines marks that the country has made tremendous breakthroughs in the building of seabed pipelines and the development of deep-water technologies and equipment.
So far, China has laid over 9,000 kilometers of deep-water gas-oil pipelines, developed a deep-water pipe-laying crane vessel known as Hai Yang Shi You 201, which is Asia's first such ship and can lay pipes at depths of 3000 meters, and become a global leader in the research as well as development of deep-water pipeline-laying technologies.
Photo shows specially designed deep-water gas-oil pipelines by China National Offshore Oil Corporation for the country's Deep Sea No.1 deep-water gas field.[Photo/sasac.gov.cn]
With proven geological reserves of natural gas exceeding 50 billion cubic meters, the second phase of the Deep Sea No.1 deep-water gas field will lift the annual production capacity of the country's first self-operated deep-water gas field from three billion cubic meters to 4.5 billion cubic meters and fundamentally ensure national energy security when it is put into operation.
(Executive editor: Xie Yunxiao)
