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In oil extraction operations, rod pump barrels is the core component of the tubing pump, and the operating status directly determines the oil recovery efficiency and operating cost. Once rod pump barrels fail, it will not only cause oil production to be interrupted, but may also cause complex underground problems, increasing the difficulty of maintenance and economic losses.

The tubular pump cylinder adopts a single-cylinder integrated structure, and the whole is a seamless steel pipe (whole cylinder type) or outer pipe + inner liner (combined type), which is directly fixed to the lower end of the tubing as an extension of the tubing, without additional nested parts.

Rod pump barrels corrosion is mainly due to complex underground media： One is that the chloride ions and sulfate ions contained in the highly mineralized formation water will destroy the passivation film on the metal surface of rod pump barrels and cause electrochemical corrosion;