Oil prices rose on Thursday after a drone strike on a Saudi Aramco oilfield heightened concerns that the expanding conflict in West Asia could disrupt supplies.The attack also prompted the United States to order some diplomats and their family members to leave its missions in Saudi Arabia.Read more: D-St set for a negative opening as GIFT Nifty signals weak startCrude oil price on October 22Brent crude traded 1.18% higher at $110.18 a barrel, while US West Texas Intermediate (WTI) crude was trading more than $98 a barrel.