China makes new milestone in deep-sea resource exploration with completion of Shenhai Yihao offshore gas field

Shenhai Yihao, or Deep Sea No. 1, China's first homegrown ultra-deepwater gas field project, was completed on Thursday after the construction of its second phase came to an end. The achievement sets a major milestone for the country's self-reliance in accessing deep-sea resources and shows its commitment to securing a sustainable energy supply, China Media Group (CMG) reported.

This breakthrough followed the successful launch of the first phase in June 2021. Operating at a maximum depth of nearly 1,000 meters, the latest development features the deployment of 13 world-leading technological facilities, the CMG reported.

It introduces an innovative development model combining a subsea production system, a shallow-water conductor platform for processing, and a remotely operated deep-water semi-submersible platform, which is designed to facilitate more efficient deep-sea exploitation, according to the producer, China National Offshore Oil Corporation.

In addition to the newly constructed subsea production system and the comprehensive processing platform weighing more than 14,000 tons, the project includes 12 state-of-the-art development wells and five subsea pipelines that stretch around 250 kilometers.

All offshore drilling and completion operations for the project were wrapped up by the end of August, with production testing exceeding expectations, highlighting China's global leadership in deep-water high-pressure drilling technology.

The project also includes the world's first 1,000-meter-deep water manifold constructed by China, along with other key facilities, including the country's longest deep-water oil and gas pipeline, setting multiple industry records in deep-water operations.

These milestones were made possible by the development team's targeted efforts to overcome deep-water construction challenges in the complex, high-temperature, and high-pressure marine environment, according to the producer.

The second phase of Deep Sea No. 1 has revealed more than 50 billion cubic meters of natural gas reserves. When fully operational, it is set to increase peak annual output from 3 billion to 4.5 billion cubic meters, significantly bolstering China's energy security, according to CMG.

Launched in June 2021 in the Lingshui waters off South China's Hainan Province, the initial phase of the Deep Sea No. 1 project has confirmed geological reserves surpassing 100 billion cubic meters, making it the deepest and most challenging offshore gas field currently in operation in China.

In recent years, China has made notable strides in oil and gas resource extraction, transitioning swiftly from shallow to ultra-deepwater operations while developing a series of cutting-edge production equipment, reflecting the country's enhanced self-sufficiency in the sector.