Exxon Mobil Corp.  agreed to sell stakes in its West Qurna-1 oil project in Iraq to PetroChina Co. and PT Pertamina (Persero) of Indonesia. Exxon said Thursday that PetroChina would take a 25% stake in the project and Pertamina would take a 10% stake. The West Qurna-1 field is located near Basra in southern Iraq. It is one of several big fields that Western oil companies agreed in 2010 to help Iraq develop. After selling the stakes, Exxon will retain 25% of the field and continue as its operator. The rest of the field is owned by Royal Dutch Shell PLC and Iraq’s state-owned South Oil Co.