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Ⅰ.The use of rod pumps to pump oil is the core method of oilfield mechanical oil recovery： In oilfield development, when the oil well cannot be self-injected due to insufficient formation energy, thick crude oil, etc., or the output is too low, it is necessary to use mechanical energy to recover oil. At present, the main mechanical oil recovery methods we use include gas lift oil recovery and deep well oil sucker rod pump oil recovery, and rod pump pumping is one of the important types of deep well oil sucker rod pump oil recovery. With the advantages of simple structure and easy maintenance, it is most widely used in oil fields around the world, especially in shallow and medium-sized oil wells.

Ⅰ. The structure of deep well oil sucker rod pump： Pumping rod pump is also called deep well rod pump. Our deep well oil sucker rod pump is a special equipment for mechanical oil recovery with rod pump.Under the pump, it is at a certain depth below the moving liquid level in the well shaft, and relies on the sucker rod to transmit the power of the sucker to extract the crude oil from the ground. Deep well oil sucker rod pump is divided into combined pumps and whole cylinder pumps according to whether there is a bushing or not. The working cylinder of the combined deep well oil sucker rod pump has several bushings, and it is pressed by the upper and lower compression joints; the working cylinder of the whole pump is a seamless steel pipe without a bushing inside. Deep well oil sucker rod pump is divided into two types: tubular pump and rod pump according to its installation method and structure in the well.