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In the core equipment system of oil extraction, the stable operation of downhole sucker rod pump is the key to ensuring the continuous oil production of oil fields and improving the efficiency of mining. With the continuous expansion of oilfield development scenarios, from conventional shallow wells to deep wells, ultra-deep wells, from ordinary reservoirs to complex reservoirs with high sulfur content and high mineralization, the working conditions faced by downhole sucker rod pump are becoming more and more serious. As the core pressure bearing and sealing component of downhole sucker rod pump, the pump barrel is directly related to the overall performance, service life and operating stability of the equipment. It has become an important research direction in the industry to optimize the performance of downhole sucker rod pump.​

Downhole sucker rod pump generally refers to a plunger-type oil pump driven by the reciprocating movement of the sucker rod up and down. It is the key underground equipment of the rod pumping system. It is mainly composed of four parts: pump cylinder, plunger, fixed valve and swimming valve. When working, the ground pumping unit drives the plunger up and down through the pumping rod.

Downhole sucker rod pump adopts an innovative double-layer pump barrel structure. Downhole sucker rod pump is designed for deep and thin oil well conditions. Downhole sucker rod pump is suitable for oil wells that cannot be produced normally due to insufficient formation fluid supply or low formation pressure in conventional lifting processes. The standard applicable well depth range is 2600 meters to 3500 meters.