Oil displacement agent assisted steam flooding oil extraction method

The invention discloses an oil displacement agent assisted steam flooding oil extraction method. The method comprises steps of preparing a solution of the high temperature resistant oil displacement agent and water, wherein the concentration of the high temperature resistant oil displacement agent is 30000 to 400000 mg/L, continuously or periodically injecting the solution of the high temperature resistant oil displacement agent into a steam injection well when a heavy oil reservoir is under steam flood. The burial depth of the heavy oil reservoir is 900 to 1600 m, the effective thickness of the oil reservoir is greater than or equal to 8 m, the viscosity of crude under the condition of the oil reservoir is greater than 100 mPa.s, and the mineralization of stratum water is lower than 50000 mg/L. The high temperature resistant oil displacement agent is sulfonate containing aromatic groups. The injection speed of the high temperature resistant oil displacement agent is 0.5 to 2.4 ton/day. The period that the solution of the high temperature resistant oil displacement agent is injected for 5 to 30 days, and injection of the solution of the high temperature resistant oil displacement agent is stopped for 60 to 90 days. Aiming at the technical background that the hot water belt displacement efficiency is low during simple steam flood, the oil displacement agent assisted steam flooding oil extraction method is provided to effectively raise the hot water belt displacement efficiency, so that the steam flooding recovery efficiency of a heavy oil reservoir can be raised.