BP PLC and the China National Offshore Oil Corporation have signed heads of agreement for the supply of up to 1.5 million tons of liquefied natural gas a year over 20 years, starting in 2019. BP said its expects a full commercial contract to be agreed in mid-2014. The Wall Street Journal reported Tuesday that BP would sign a $20 billion long-term contract to supply LNG to southeast China, quoting the company’s chief executive. Speaking to reporters at the World Petroleum Congress, Bob Dudley said the 20-year deal would be signed with Chinese state-owned Cnooc in London in front of British Prime Minister David Cameron and Premier Li Keqiang during the Chinese leader’s three-day visit to Britain . BP added that it would likely supply LNG from its global portfolio, using its own LNG tanker fleet and chartered ships delivering gas to a number of terminals in China. […]