The invention relates to a
metal quaternary ammonium oxyphosphate dispersoid for developing the oil deposit of thickened oil to improve the exploitation rate of
crude oil and application of the
metal quaternary ammonium oxyphosphate dispersoid to the exploitation of the thickened oil. By the
metal quaternary ammonium oxyphosphate dispersoid, the emulsification, catalytic
viscosity reduction and
dissolution in
exothermic reaction of the thickened oil are realized. According to the technical scheme, the metal quaternary ammonium oxyphosphate dispersoid consists of quaternary ammonium cations and metal oxyphosphate anions. A preparation method comprises the following steps of: stirring an
aqueous solution of Na2MoO4 or Na2WO4 or NaVO4 and a Na2HPO4 solution, heating, dripping concentrated
hydrochloric acid for reacting, and extracting by using
diethyl ether to prepare metal oxyphosphate; and adding
alkyl trimethyl
ammonium chloride, and stirring to prepare the metal quaternary ammonium oxyphosphate dispersoid. The thickened oil is heated to be melted, and metal quaternary ammonium oxyphosphate and
hydrogen peroxide are added with stirring or air is introduced or peroxy-
isobutane is added to perform reaction for 3 to 8 hours, so that the
viscosity reduction of the thickened oil is realized under the condition of
catalytic oxidation. The metal quaternary ammonium oxyphosphate has acatalytic effect, so that the thickened oil is subjected to the exothermic
catalytic oxidation reaction under the action of an oxidant to reduce the
viscosity and improve the exploitation rate.