The Bozhong 19-6 field is considered to be the world’s first large-scale, high-yield, mono-block gas and condensate field.
Located in the Bohai Bay Basin offshore China, it is the largest oil and gas discovery to be made in the area in the last 50 years.
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The field is owned and operated by the China National Offshore Oil Corporation (CNOOC).
The first production from phase one of the Bozhong 19-6 field development commenced in November 2023. The gas field is currently producing approximately 37,500 barrels of oil equivalent per day (boepd).
The Bozhong 19-6 field will increase the country’s energy security and help ensure a clean energy supply for low-carbon and sustainable development in the Beijing-Tianjin-Hebei region, as well as address gas supply shortages in North China.
Location of the Bozhong 19-6 field
The field is located in the Bozhong Sag of South Central Bohai, 100km from Bohai Bay, at an average depth of approximately 23m.
Discoveries made in the past 50 years in Bohai Bay, China’s second-largest crude oil production base, are primarily crude oil reserves due to the complex nature of its geological structure.
Reserves at Bozhong 19-6 field
The Bozhong 19-6 field holds proven reserves of 200 billion cubic metres (bcm) of natural gas and 200 million cubic metres (mcm) of oil.
Discovery and appraisal
High-quality, high-yield oil flow was discovered in the Bozhong 19-6 field in 2017. CNOOC drilled three wells in the north of the field to open up new exploration areas.
The corporation had completed four appraisal wells in 2019 that revealed gas layers above 100m.
The field appraisal results added proved in-place volume of approximately 200mcm of oil equivalent, increasing the total proved in-place volume to more than 300mcm.
Bozhong 19-6 field details
The Bozhong 19-6 field uses a newly built wellhead platform and the existing processing facilities of the Bozhong 13-1 oilfield.
The main production facility includes a central processing platform, three unmanned wellhead platforms and one gas processing terminal.
A total of 65 development wells are planned to be commissioned at the field, including 42 production wells, 20 gas injection wells and three water source wells.
Gas from the field is supplied to the market through existing pipelines.
CNOOC announced the initiation of operations at the Block 13-2/5 well site development project within the Bozhong 19-6 gas field in May 2024.
The principal production facilities comprise a wellhead platform with plans to commission ten development wells.
The project is anticipated to reach a peak production of approximately 5,800boepd by 2026.
In July 2024, CNOOC announced that the D1well, which is the first ultra-deep well in the field, achieved a high yield producing 6,300boepd. The D1 well was drilled to a depth of 6,088m.
Bozhong 19-6 field pilot project details
The pilot project involved the construction of a treatment plant, a pile jacket, an offshore platform and two undersea pipelines, renovating two more offshore platforms and installing a submarine cable.
The pilot project was completed within 14 months under the exploration, development, and production integrated management mode.
The milestone was achieved with the help of lower wellhead platforms, which were used to drill wells on both sides of the platform.
The field development will involve the drilling of eight more wells, including seven production wells and a water source well.
Seven development wells had been put into operation by March 2024, and the daily production of condensate oil exceeded 1,100 tonnes and daily natural gas production to 1mcm.
