With reference to the national standards, the general properties of a mixed crude oil with a Russian crude mass fraction of 30% were measured.A novel metal⁃removal agent for crude oil,featuring a multidentate structure and favorable hydrophilicity, was developed, and its demetallization efficiency was assessed through orthogonal array experiments.The results show that the mixed crude oil is acid⁃containing light crude oil, which mainly contains five metal elements:iron,nickel,calcium,sodium,and vanadium.The new type of crude oil demetallizer shows excellent demetallization performance for mixed crude oil.However,the degree of influence of various operating conditions on the removal of different metal elements varies significantly.Temperature and the intensity of the weak electric field have the most significant effects on the removal of iron and calcium elements,respectively.In terms of total removal rate,the optimal operating conditions obtained from orthogonal experiments are as follows:temperature of 120 ℃,settling time of 10 min,the mixing intensity is 100 times/min,strong electric field strength of 1 000 V/cm,strong electric field action time of 2 min, weak electric field strength of 400 V/cm, and weak electric field action time of 15 min.Under the above conditions,the removal rates of iron,calcium, and sodium elements are all above 94.00%,and the total removal rate of the five metal elements reaches 66.66%,achieving deep removal of metal elements in mixed crude oil,and indicating that the developed new⁃type crude oil demetallization agent has good demetallization performance for this type of mixed crude oil.