Petroleum and PetroChina Company have signed a letter of intent to undertake a joint feasibility study for a refining and petrochemical project in China. PetroChina will have a 51% shareholding, QPI 24.5% and Shell 24.5% in the project. The agreement was signed in Doha by Abdulla Bin Hamad Al Attiyah, Qatar’s Deputy Prime Minister, Jiang…