Selective zone commingled oil production pipe string

The utility model discloses a selective zone commingled oil production pipe string which is applied for oil extraction at the same time at two oil reservoirs with different strata pressures. The selective zone commingled oil production pipe string is characterized in that a constant-pressure allocator is connected on the pipe string which is composed of oil pipes, and the constant-pressure allocator is arranged at the upper part of the upper oil reservoir. A packer is connected on the pipe string and is packed and sealed in the annular space between the sleeves between the two oil reservoirs and the oil pipes; a check valve is connected on the pipe string at the lower part of the packer; and the lower part of the check valve is connected with a shock tube. An oil pump is arranged inside the lower part of the pipe string, above the constant-pressure allocator. The packer packed and sealed between the oil reservoirs separates the two oil reservoirs. The liquid at the lower oil reservoir enters the oil pipes through the shock tube, the liquid of the upper oil reservoir enters the oil pipes through the constant-pressure allocator, and the liquid of the upper oil reservior and the liquid of the lower oil reservoir converge in the oil pipes and then are pumped up to the ground. Oil can be extracted at the two oil reservoirs at the same time and the strata pressures of the two oil reservoirs do not interfere with each other, so the yield of crude oil of a single well can be improved.