Packer for combination oil production by layer

The utility model relates to a packer for combined oil production by layers, belonging to a downhole tool for oil wells in oil fields. The utility model can solve the technical problems of large span of oil layers and low reserves abundance existing in low-permeability oil fields, and can solve the technical problem that single oil production by layers can not be used for the development of a set of series of layers. The utility model is characterized in that the packer is provided with a constant pressure component which is composed of a liner tube, a fixed valve, a movable valve, a pressure adjusting spring and an adjusting nut; a liquid inlet hole is arranged at the upper part of the liner tube, and an annular channel is arranged between the liner tube and a central tube; the upper and the lower ends of the fixed valve are respectively provided with a seal ring, the upper part of the fixed valve is provided with an outer conical surface and a liquid outlet hole; the upper part of the movable valve is provided with an inner conical surface. The utility model can be used for the combined oil production by layers for low-yield oil wells, and has the advantages of easy construction, improved pumping efficiency, etc.