Method for improving recovery ratio of super heavy oil reservoir

The invention provides a method for improving the recovery ratio of a super heavy oil reservoir. The method for improving the recovery ratio of the super heavy oil reservoir comprises the following steps of: 1, preheating two horizontal wells in parallel distribution; 2, injecting steam into the upper part horizontal well, and maintaining the original stratum pressure in the lower part horizontal well for production; 3, simultaneously injecting steam, carbon dioxide and viscosity reducers into an oil layer through the upper part horizontal well, and maintaining the original stratum pressure in the lower part horizontal well for production; and 4, stopping the injection of the carbon dioxide and the viscosity reducers, continuously injecting the steam into the upper part horizontal well and maintaining continuous production of the lower part horizontal well. The method for improving the recovery ratio of the super heavy oil reservoir has the advantages that the viscosity of crude oil is greatly reduced; the heat loss of top and bottom cover layers is reduced; the steam enthalpy is improved; the elasticity energy of the stratum and fluid is increased; the flow seeping capability in near bore zones is improved; and the crude oil is recovered through the gravity effect so as to improve the recovery ratio of the super heavy oil reservoir.