A multi-element thermal fluid thermal recovery oil reservoir numerical simulation method, comprising: step 1, performing a PVT experiment, and obtaining a multi-element thermal fluid PR-EOS state equation by using data obtained by testing; solving a phase diagram of a multi-element thermal fluid-thickened oil system on the basis of the state equation; step 2, performing a reservoir damage evaluation experiment, and establishing a multi-element thermal fluid reservoir damage mathematical model; and step 3, establishing a multi-element thermal fluid numerical simulation method by using the novel multi-element thermal fluid PR-EOS state equation and the reservoir damage mathematical model obtained in step 1 and step 2, and performing programming implementation to obtain a multi-element thermal fluid numerical simulator; and obtaining a plurality of construction solutions for multi-element thermal fluid thermal recovery under different conditions by means of the numerical simulator, and performing comparison to obtain an optimal solution. The method can effectively solve the problem that existing multi-element thermal fluid thermal recovery oil reservoir numerical simulation methods cannot accurately describe the phase state characteristics of a multi-element thermal fluid and the damage of the multi-element thermal fluid to the reservoir.
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