Working condition analysis method taking oil production benefit of multilayer commingled production well as evaluation target

The invention discloses a working condition analysis method taking oil production benefits of a multi-layer commingled production well as an evaluation target. The method mainly solves the problem of limitation that an existing mechanical production well working condition analysis method does not take the water content and the oil production benefit into consideration. Comprising the following steps that a certain submergence degree value hsub is set, the pump suction inlet pressure Ps and the bottom hole flowing pressure Pwf are calculated, the liquid production capacity Qli and the oil production capacity Qoi of the ith liquid outlet layer under the flowing pressure Pwf are calculated, and the bottom hole mixed liquid production capacity Q1 (Pwf) and the oil production capacity Qo (Pwf) are calculated; the pump fullness eta p, the pump liquid production capacity Q (hf), the pump oil production capacity Qo (hf), the ground oil production capacity Qo (ground) and the system input power P < in > are calculated