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

A technology of piston seals and pumping units, which is applied in the field of hydraulic pumping units, can solve problems such as inconvenience, and achieve the effect of low operating costs

CN106321024BActive Publication Date: 2018-09-28山东高原油气装备有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-09-28

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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.
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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...

Examples

Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the hydraulic pumping unit of the present invention does not change oil cylinder piston seal is carried out in detail. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but to illustrate the essence of the technical solution of the present invention.

[0029] According to the hydraulic pumping unit of the present invention, its technical proposal is: a hydraulic pumping unit without engine replacement of cylinder piston seals. The hydraulic pumping unit includes a hydraulic station, a main hydraulic cylinder, a frame, connectors and a supporting hydraulic cylinder. The main hydraulic cylinder of the hydraulic pumping unit is installed on the frame, and the piston rod is connected with the wellhead polished rod through the connecting piece with the direction of the piston cylinder facing upwards. The supporting hydraulic cylinder is mounted on th...