The well was drilled in the Longkou 7-1 oilfield, which is situated in the eastern region of Bohai Bay. Credit: Ingvar Tjostheim/Shutterstock.

China National Offshore Oil Corporation (CNOOC) has reported a new record for gas tested productivity at the Mesozoic buried hill in Bohai Bay in the Longkou 7-1 oilfield.  

The Longkou 7-1 oilfield is situated in the eastern region of Bohai Bay, where the average water depth is around 26m.  

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The exploration well, LK7-1-1, reached a depth of approximately 4,400m and revealed 76m of oil and gas pay zones, the company said. 

CNOOC added that this well yielded around 210m³ of crude oil and nearly 1mcm of natural gas daily.  

This output set a new record for gas-tested productivity in the bay area, the Chinese energy major noted.  

CNOOC deputy chief exploration officer Xu Changgui said: “In recent years, we have continued to make new discoveries in metamorphic buried hills medium-to-deep plays in Bohai Bay. The successful well demonstrates the broad exploration prospect in Mesozoic volcanic rocks in Bohai Bay.  

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“It also testifies the progress in the company’s understanding and technological capabilities in tapping resources in medium-to-deep plays. The expertise we gained will guide our exploration in similar plays offshore China.” 

Recently, CNOOC announced that its D1 Well in the Bozhong 19-6 condensate gas field surpassed production expectations.  

Located in the central part of Bohai Bay at an average water depth of around 20m, the field boasts more than 200 billion cubic metres of natural gas and over 200mcm of oil. 

The D1 well, drilled to a depth of 6,088m, represents the company’s first ultra-deep well in the bay.  

It is currently producing approximately 6,300 barrels of oil equivalent per day. 

These developments follow the start of production at the Wushi 23-5 oilfield, notable for being the first in the South China Sea to be powered from shore.