Hydraulic pumping unit and method for replacing oil cylinder piston seals without motor

Abstract

The invention provides a hydraulic oil pumping unit using immobility machine to replace piston sealing element in oil cylinder and replacing method. The hydraulic oil pumping unit includes hydraulic station, master cylinder, body frame, connecting piece and support cylinder. The master cylinder piston rod of the hydraulic oil pumping unit is fixed upwards with oil cylinder body arranged on the body frame and the piston rod connected with polish rod of the mouth of oil well. Support cylinder arranged on the body frame is able to jack up the piston rod of the master cylinder, which allows the sealing element of piston rod to be removed out of the hydraulic cylinder. The bottom of master cylinder can be disassembled and can hang in the air. Hydraulic pipeline connected to the master cylinder is provided with switch valve and can choose to provide the master cylinder or the support cylinder with power liquid. Furthermore, the invention also provides the method for the replacement of piston sealing element of oil cylinder with immobility machine. The invention overcomes the problem of heavy workload caused by moving the oil cylinder in replacement of piston sealing element in hydraulic oil pumping unit in current technology. According to the invention of hydraulic oil pumping unit, the replacement of sealing element is finished by using the support cylinder to remove the sealing piston out of oil cylinder, which has simple operation and saves time and efforts.

Description

technical field [0001] The invention relates to a hydraulic oil pumping unit, more particularly to an oil cylinder thrust type hydraulic oil pumping unit. Background technique [0002] As a professional oilfield equipment, the hydraulic pumping unit is used to complete the operation of lifting the formation fluid from the bottom of the well to the surface, and is suitable for the working system of long stroke and low stroke frequency. During the use of the hydraulic pumping unit, the cylinder piston seal is a consumable part. After a period of operation (generally 6 months to 12 months), it is necessary to stop the machine and replace it with a new cylinder piston seal to ensure pumping. The normal operation of the oil machine and high system efficiency. In the prior art, the hydraulic cylinder is generally disassembled from the pumping unit as a whole, transported back to the maintenance workshop, and the piston rod of the hydraulic cylinder is removed by professional equi...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a hydraulic pumping unit and a method for replacing the piston seal of the oil cylinder without a motor, which overcomes the inconvenient problem of replacing the piston seal of the hydraulic cylinder in the existing hydraulic pumping unit, and can be used without disassembling the pumping unit. The hydraulic cylinder on the oil machine, complete the replacement of the piston seal of the hydraulic cylinder without using construction machinery

Images