reo(a) Advantages: 1.Long stroke, low stroke (287) means lower the wearing on down hole facilities and low operation cost; 2.100% mechanical transmission, roof bolt running smoothly and high coefficient of admission of pump; 3.Smaller gear box torque and electrical motor power result in dramatic decrease of energy consumption Evident advantages compared with 4.Electric Submersible Pump, Hydraulic and Gas pumps; 5.Full consideration in the design of main parts in order to safety and convenient well servicing and transportation; 6.High reliability without frequent maintenance.