Oil production string

The invention discloses a flow string used for thick oil production, comprising an oil-string casing, a main oil pipe, a pumping rod and an oil well pump, wherein, a well head is arranged on the top of the oil-string casting. The invention is characterized in that: a watered pump is arranged on the lower end of the main oil pipe; the pumping rod is connected with a piston of the watered pump; theupper end of a pump barrel of the watered pump is connected with the main oil pipe; an oil-water mixer is arranged between the watered pump and the oil well pump and takes the structure of a tee joint; an upper passage and a lower passage of the tee joint are respectively connected with the lower end of the pump barrel of the watered pump and the upper end of a pump barrel of the oil well pump; an auxiliary oil pipe is connected with the bypass of the tee joint; the piston of the watered pump is connected with a piston of the oil well pump through a connecting rod; an oil outlet passage and awater inlet passage are ar