Multifunctional string capable of washing well, logging and layering profile control flooding

The utility model relates to a multifunctional string capable of washing well, logging and layering profile control flooding. The multifunctional string comprises a first water filling tube, a second water filling tube and an oil well bush. The second water filling tube is communicated with a chemical profile control and flooding agent filling tube. A profile control target stratum and a flooding target stratum are separated by a packer. The top end of the first water filling tube is connected with a hanger. The bottom of the second water filling tube is connected with a switch type rail seal slide sleeve. The bottom end of the first water filling tube is inserted into the slide sleeve and is communicated with the flooding target stratum through holes on the outer wall of the slide sleeve. The holes is opened or closed by a switch slide sleeve disposed in the switch type rail seal slide sleeve. The second water filling tube and a hollow seal rod at the bottom end of the first water filling tube are packed by the switch type rail seal slide sleeve. The multifunctional string solves the problem that polymer accumulates on the packer to cause unpacking difficulty of the packer, and can perform well washing to the profile control target stratum; and logging can be performed by pulling the hollow rod and putting the same into a through tubing logging instrument, and accordingly operation cost is lowered.