China National Offshore Oil Corp said its purchase agreements signed at the China International Import Expo (CIIE) during the past five years have accumulated to $50 billion, which illustrates the company's determination in stepping up international cooperation, the company said on Sunday.

The company has signed purchase agreements with 18 global suppliers during the ongoing fifth China International Import Expo (CIIE), the company said on Sunday.

This is the fifth year the company participated in the CIIE, it said.

The company, currently the country's largest offshore oil and gas producer, has so far signed 230 foreign cooperation contracts with 81 international oil companies during the past four decades. It has attracted more than 250 billion yuan of foreign investment and, meanwhile, offshore oil and gas has long been among the industries that attract the most foreign investment in China, it said.

CNOOC has accumulated rich experiences in expanding global cooperation during the past forty years of development and the company is willing to further expand cooperation with global peers in the years to come, said Wang Dongjin, chairman of CNOOC.