The first well, Dukhan 1, was drilled in 1939. Development continued after World War II and in 1949 the first crude exports occurred and the first offshore concessions were granted. In 1960, the Idd Al-Shargi and Maydan Mahzam fields were discovered. The largest offshore field, Bul Hanine, was discovered in 1970 and came onstream in 1972. Qatar Petroleum was created in 1974.