Fixed pulley suspension type single-well multi-pump balance load low-power-consumption lifting system and method

The invention discloses a fixed pulley suspension type single-well multi-pump balance load low-power-consumption lifting system and method. The fixed pulley suspension type single-well multi-pump balance load low-power-consumption lifting system is characterized by comprising a fixed pulley suspension type oil pumping unit, a multi-polished-rod multi-suspension oil production wellhead device and aparallel multi-pump underground oil production pipe column. Pipe column bodies of the parallel multi-pump underground oil production pipe column are divided into two sets, and polished rods at the upper ends of the two sets of oil production pipe column bodies stretch out of a wellhead. The fixed pulley suspension type oil pumping unit comprises a machine frame, a fixed pulley and an up-and-downdriving device. The fixed pulley and the up-and-down driving device are installed on the machine frame. Steel wire ropes on the two sides of the fixed pulley are connected with the polished rods at the upper ends of the corres