China's largest offshore oil producer CNOOC on Friday signed an agreement with Qatargas to buy more liquefied natural gas (LNG) to meet the rising domestic demand.

Both parties signed a memorandum of understanding (MOU) on Friday, under which Qatargas will supply an additional 3 million tons of LNG per year, said a CNOOC statement.

CNOOC is also planning to buy another 2 million tons of LNG from Qatargas annually, to further bolster its annual LNG purchase from the gas-rich country to 7 million tons, said the statement.