CN210829155U

CN210829155U - Lubricating device for polished rod

Info

Publication number: CN210829155U
Application number: CN201920672230.0U
Authority: CN
Inventors: 杨国宏; 赵传奇; 于学红; 高珊珊; 周峰; 汤立春; 谢发军; 王东寨; 罗翔
Original assignee: China Petroleum and Chemical Corp; Sinopec Northwest Oil Field Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Northwest Oil Field Co
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-06-23
Anticipated expiration: 2029-05-10

Abstract

The utility model provides a lubricating arrangement for polished rod, include: the sealing body is fixedly installed at the wellhead, the polish rod penetrates through the sealing body and is put into the wellhead, and an annular part is formed between the sealing body and the polish rod; the first packing and the second packing are axially arranged in the annular hollow part at intervals, a closed lubricating cavity is formed between the axial end faces of the first packing and the second packing, and lubricating oil is filled in the lubricating cavity; the cavity is communicated with the lubricating cavity, a piston is arranged in the cavity, and a storage cavity for storing lubricating oil is formed in one side, located on the piston, of the cavity; and an elastic component is arranged on the other side of the piston, and can push the piston to self-compensate the lubricating oil in the lubricating cavity and extrude the lubricating oil to form an oil film on the surface of the polished rod so as to continuously lubricate the polished rod.

Description

Lubricating device for polished rod

Technical Field

The utility model belongs to the technical field of the oil well polished rod is sealed, specifically relate to a lubricating arrangement for polished rod, especially a high pressure that can realize self-compensating lubricating oil is used for lubricating arrangement of polished rod.

Background

In recent years, as reservoir development progresses, the water content of oil and gas fields gradually rises, so that most of oil wells gradually enter a high water-cut period or a very high water-cut period, and the high water-cut wells gradually increase. The existing wellhead sealing device is mainly characterized in that a packing is additionally arranged in a sealer to enable a polish rod and the packing to form sealing. However, packing is worn in the process of up-and-down operation of the polish rod, and if the wellhead does not discharge liquid or the discharged liquid contains high water, the packing is worn seriously. In the production process, the wellhead packing of the high-water-cut well is quickly abraded, and the packing needs to be frequently replaced. Because there is three high problems in the oil well, high sulfur content hydrogen sulfide, high mineralization degree, high thick promptly to make polished rod surface can't form the oil film, this lubricating property that leads to the polished rod is poor, polished rod and packing direct friction lead to packing rapid wear, thereby arouse well head thorn phenomenon.

At present, in the construction operation process, the polished rod seal is mainly subjected to manual inspection and packing replacement to reduce the phenomenon of puncture. Particularly, packing needs to be changed once every day on average, and 3 packing changes every time, and the production needs to stop 20 minutes every time changing the packing, if take place to puncture, need to administer well head pollution and need 2 people 1 day can accomplish treatment work. This not only causes the beam-pumping unit to shut down and influences production ageing, and the use amount of packing also obviously increases. In addition, the oil pollution is seriously caused by the wellhead puncture caused by the abrasion of the wellhead packing, and the oil pollution treatment cost and the workload are obviously increased. These all reduce the production efficiency seriously, increase the production cost greatly.

SUMMERY OF THE UTILITY MODEL

To the technical problem as described above, the present invention aims to provide a lubricating device for a polish rod. This lubricating arrangement can form inclosed lubricated chamber in order to carry out force-feed lubrication to can self-compensating lubricating oil in order to carry out the continuous lubrication to the light rod, thereby showing the wearing and tearing that have reduced the packing, effectively avoided the well head to appear the thorn hourglass phenomenon, reduced the change frequency of packing, improved production efficiency greatly, show to reduce manufacturing cost.

Therefore, according to the utility model discloses, a lubricating arrangement for polished rod is proposed, include: the sealing body is fixedly installed at the wellhead, the polish rod penetrates through the sealing body and is put into the wellhead, and an annular part is formed between the sealing body and the polish rod; the first packing and the second packing are axially arranged in the annular hollow part at intervals, a closed lubricating cavity is formed between the axial end faces of the first packing and the second packing, and lubricating oil is filled in the lubricating cavity; the cavity is communicated with the lubricating cavity, a piston is arranged in the cavity, and a storage cavity for storing lubricating oil is formed in one side, located on the piston, of the cavity; and an elastic component is arranged on the other side of the piston, and can push the piston to self-compensate the lubricating oil in the lubricating cavity and extrude the lubricating oil to form an oil film on the surface of the polished rod so as to continuously lubricate the polished rod.

In a preferred embodiment, a ring dynamic seal is adopted between the piston and the inner wall of the cavity.

In a preferred embodiment, a first end cap and a second end cap are respectively connected to two ends of the cavity in a sealing manner, so that the storage cavity forms a closed cavity.

In a preferred embodiment, one end of the elastic member is fixedly connected with the piston, and the other end of the elastic member abuts against the end face of the first end cover, so that the piston self-compensates the lubricating oil in the lubricating cavity under the elastic action of the elastic member.

In a preferred embodiment, one end of the piston is provided with a jackscrew for pulling the piston back, and the jackscrew penetrates through the first end cover and partially extends out.

In a preferred embodiment, the volume of the storage chamber is set to be in the range of 120-.

In a preferred embodiment, the elastic member is a spring.

In a preferred embodiment, the second end cap is provided with a connecting channel, an oil inlet is provided in a side wall region of the sealing body located in the lubrication chamber, and the connecting channel is communicated with the oil inlet, so that the storage chamber is communicated with the lubrication chamber.

In a preferred embodiment, the diameter of the oil inlet is arranged to be in the range of 5-7 mm.

In a preferred embodiment, a first adjusting pressing cap and a second adjusting pressing cap are respectively arranged at the upper ends of the first packing set and the second packing set, and the first adjusting pressing cap and the second adjusting pressing cap are used for adjusting and mounting the first packing set and the second packing set.

Compared with the prior art, the utility model has the advantages of:

according to the utility model discloses a lubricating arrangement for polished rod can form inclosed lubricated chamber and form force-feed lubrication to the polished rod to can self-compensating lubricating oil in order to last the lubrication to the polished rod, thereby reduced polished rod and packing direct friction and the packing wearing and tearing that lead to, effectively avoided the well head to appear the thorn hourglass phenomenon. Specifically, the lubricating device can prolong the frequency of replacing the packing from one time to one time of fifteen days, is safe and reliable, obviously reduces the replacing frequency of the packing, saves the maintenance workload, greatly improves the production efficiency and obviously reduces the production cost. Moreover, the lubricating device has strong applicability and can be widely applied to construction operation of the pumping well. This lubricating arrangement promotes the piston through elastic component's effort to the lubricating oil in extrusion storage chamber and the lubricated intracavity makes lubricating oil directly attach to the surface of polished rod and form the oil film and force-feed lubrication polished rod, becomes to the polished rod and forces stable even lubrication action, has improved the lubricated effect of polished rod greatly, has effectively reduced the wearing and tearing of packing. In addition, the lubricating device has the advantages of simple structure, convenient processing, easy installation and low manufacturing cost.

Drawings

The present invention will be described with reference to the accompanying drawings.

Fig. 1 schematically shows the structure of a lubricating device for a polished rod according to the present invention.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

In the present application, it is to be noted that directional terms or qualifiers "upper end", "lower end", and the like used in the present application are all referred to the drawings referred to. They are not intended to limit the absolute positions of the parts involved, but may vary from case to case.

Fig. 1 schematically shows the structure of a lubricating device 100 for a polished rod according to the present invention. As shown in fig. 1, the lubricating device 100 for a polished rod includes a sealing body 101 fixedly installed at a wellhead 200. In one embodiment, the sealing body 101 is configured as a hollow cylinder. The polish rod 102 is lowered into the wellbore through the seal 101 for construction work, and an annular portion is formed between the polish rod 102 and the seal 101.

As shown in fig. 1, a first packing 103 and a second packing 104 are provided in the annular portion. The first packing set 103 and the second packing set 104 are axially spaced apart so that a sealed lubrication chamber 110 is formed in the annular portion between the lower end face of the first packing set 103 and the upper end face of the second packing set 104. The lubrication cavity 110 is filled with lubricating oil to lubricate the polished rod 102, so as to reduce the wear of the first packing 103 and the second packing 104, and prevent the wellhead from generating a puncture phenomenon. In one embodiment, the lubricating oil may be butter.

According to the utility model discloses, be equipped with first regulation in the upper end of first packing 103 and press cap 105, be equipped with second regulation in the upper end of second packing 104 and press cap 106. Adjust first regulation and press cap 106 and second regulation and press cap 106 can adjust first packing 104 of installation and second packing 105 respectively, and then adjust the extrusion sealing degree of first packing 104 and second packing 105 to can improve the leakproofness between polished rod 102 and first packing 104 and the second packing 105, guarantee the sealing performance of lubricated chamber 110, effectively avoid the leakage of lubricating oil.

According to the present invention, the lubrication device 100 further comprises a cavity 120 communicating with the lubrication cavity 110. As shown in fig. 1, the chamber 120 is configured in a cylindrical shape. A piston 130 is arranged in the cavity 120, and a dynamic seal is formed between the piston 130 and the side wall of the cavity 120, so that a storage cavity 122 for storing lubricating oil is formed in the cavity 120 at the side of the piston 130. A first end cap 123 and a second end cap 124 are respectively disposed at both ends of the chamber 120. Preferably, the first end cap 123 and the second end cap 124 are connected with the cavity 120 in a threaded sealing manner, so as to ensure the sealing performance of the storage cavity 122, thereby effectively avoiding the leakage of the lubricating oil.

In this embodiment, a connection passage is provided at the middle of the second end cap 124. An oil inlet 111 is arranged in the area of the side wall of the sealing body 101, which is located in the lubrication chamber 110, and the diameter of the oil inlet 111 is set to be in the range of 5-7 mm. The connecting passage in the second end cap 124 communicates with the oil inlet 111, thereby communicating the reservoir chamber 122 with the lubrication chamber 110. The lubricating oil stored in the storage cavity 122 can continuously enter the lubricating cavity 110 through the oil inlet 111, so that the lubricating oil is supplemented to the lubricating cavity 110, the lubricating cavity 110 is guaranteed to be filled with the lubricating oil all the time in the working process, the polished rod 102 is guaranteed to be lubricated continuously, and the lubricating effect of the polished rod 102 is guaranteed.

According to the present invention, an elastic member 140 is provided at one end of the piston 130, and preferably, the elastic member 140 is a spring. One end of the elastic member 140 is fixedly connected to the piston 130, and the other end abuts against the inner end surface of the first end cap 123. One end surface of the piston 130 is in contact with the lubricating oil in the storage chamber 122, and the other end surface is urged by the elastic force of the elastic member 140. Thus, the piston 130 pushes and presses the lubricating oil by the elastic member 140, and the lubricating oil in the lubrication chamber 110 can be self-compensated. Thus, the lubricating oil is squeezed to be directly adhered to the surface of the polished rod 102 to form an oil film, so that the polished rod 102 is forcibly lubricated and the polished rod 102 is lubricated well. The polish rod 102 reciprocates in the well bore through the lubrication chamber 110 during construction so that the lubrication oil in the lubrication chamber 110 continuously forcibly lubricates the polish rod 102. Therefore, a good lubricating environment is provided for the polish rod 102, so that the abrasion of packing can be reduced to the maximum extent, and the phenomenon of wellhead puncture is effectively avoided.

In this embodiment, the factors of wellhead pressure and possible loss of oil are taken into account. The piston 130 and the inner wall of the storage cavity 122 are sealed by a ring surface, so that a ring surface dynamic seal is formed between the piston 130 and the inner wall surface of the storage cavity 122, the sealing performance between the piston 130 and the inner wall of the storage cavity 122 in the movement process is ensured, the sealing performance of the storage cavity 122 is further improved, and the leakage of lubricating oil is effectively avoided.

As shown in fig. 1, a jack screw 150 is further provided at the end of the piston 130 where the elastic member 140 is provided. The jack screw 150 is used to pull and retract the piston 130 to maximize the volume of the storage chamber 122 for adding lubrication oil to the storage chamber 122. One end of the jack screw 150 is fixedly connected with the piston 130, while the free end of the jack screw 150 passes through the first end cap 123 and partially protrudes, and the jack screw 150 is in clearance fit with the first end cap 123. When the elastic member 140 is a spring, the spring is fitted over the jack 150.

In this embodiment, the volume of the storage chamber 122 is minimized when the elastic member 140 pushes the piston 130 to the limit position. At this time, it is necessary to remove the chamber 120 from the second end cap 124, pull the jack screw 150 back to maximize the volume of the reservoir chamber 122, and then add the lubricant to the reservoir chamber 122. After the lubricant is added to the storage chamber 122, the chamber body 120 is reattached to the second end cap 124. The volume of the storage chamber 122 is set to be in the range of 120-. Therefore, frequent addition of lubricating oil is avoided, and the lubricating efficiency of the polish rod is improved. In addition, in order to prevent the backflow of the lubricating oil in the lubricating cavity 110, a check valve may be disposed in the connecting pipeline, so that the backflow of the lubricating oil can be effectively avoided, and the lubricating effect and the lubricating efficiency of the lubricating device 100 on the polish rod 102 are ensured.

In an embodiment not shown, the storage chamber 122 may also be provided with a grease inlet. The oil fill port is preferably located in a sidewall of the storage chamber 122 at an end adjacent the second end cap 124. Thus, the lubricating oil can be directly injected into the lubricating cavity 110 through the oil injection port until the lubricating oil is filled in the lubricating cavity 110 and the storage cavity 122, so that the lubricating efficiency of the polish rod 102 can be further improved. In addition, the lubrication device 100 further includes a support bracket (not shown) disposed beside the wellhead for receiving the cavity 120 storing the lubricating oil. The height of the support frame can be adjusted according to actual working conditions on site to adjust the installation position of the cavity 120, so that support can be provided for the cavity 120, and the connecting pipeline is prevented from bearing the pressure of the cavity 120 and being damaged.

According to the utility model discloses a lubricating arrangement 100 for polished rod can form inclosed lubricated chamber 110 and form force-feed lubrication to polished rod 102 to can self-compensating lubricating oil in order to last lubrication to polished rod 102, thereby reduced polished rod 102 and packing direct friction and the packing wearing and tearing that lead to, effectively avoided the well head to appear the thorn hourglass phenomenon. Specifically, the lubricating device 100 can prolong the frequency of packing replacement from once a day to once fifteen days, is safe and reliable, obviously reduces the frequency of packing replacement, saves maintenance workload, greatly improves production efficiency, and obviously reduces production cost. Moreover, the lubricating device 100 has high applicability, and can be widely applied to construction work of an engine-driven pumping well. The lubricating device 100 pushes the piston 130 by the acting force of the elastic component 140, so as to extrude the lubricating oil in the storage cavity and the lubricating cavity 110, so that the lubricating oil is directly attached to the surface of the polish rod 102 to form an oil film to forcibly lubricate the polish rod, a forced, stable and uniform lubricating effect is formed on the polish rod 102, the lubricating effect of the polish rod 102 is greatly improved, and the abrasion of packing is effectively reduced. In addition, the lubricating device 100 has a simple structure, is convenient to process, is easy to install, and has low manufacturing cost.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lubrication device for a polish rod, comprising:

the sealing body (101) is fixedly installed at the wellhead, a polish rod (102) penetrates through the sealing body and is lowered into the wellhead, and an annular part is formed between the sealing body and the polish rod;

a first packing set (103) and a second packing set (104) which are arranged in the annular hollow part in an axially spaced mode, wherein a sealed lubricating cavity (110) is formed between the axial end faces of the first packing set and the second packing set, and lubricating oil is filled in the lubricating cavity;

a cavity (120) in communication with the lubrication chamber, a piston (130) being disposed within the cavity such that a storage chamber (122) for storing lubricating oil is formed within the cavity on a side of the piston;

and an elastic member (140) is arranged on the other side of the piston, and can push the piston to self-compensate the lubricating oil in the lubricating cavity and extrude the lubricating oil to form an oil film on the surface of the polished rod so as to continuously lubricate the polished rod.

2. The lubrication device of claim 1, wherein a toroidal dynamic seal is provided between the piston and the inner wall of the chamber.

3. The lubrication device according to claim 1 or 2, wherein a first end cap (123) and a second end cap (124) are sealingly connected to both ends of the chamber, respectively, such that the storage chamber forms a closed chamber.

4. The lubrication device as recited in claim 3, wherein one end of the elastic member is fixedly connected with the piston, and the other end abuts against the end surface of the first end cover, so that the piston self-compensates the lubricating oil in the lubricating cavity under the elastic action of the elastic member.

5. The lubrication device according to claim 3, wherein one end of the piston is provided with a jack screw (150) for pulling the piston back, the jack screw passing through the first end cap and partially protruding.

6. The lubrication device as claimed in claim 1 or 2, wherein the volume of the storage chamber is in the range of 120-500 ml.

7. The lubrication device of claim 1, wherein said resilient member is a spring.

8. The lubrication arrangement as recited in claim 3, characterized in that the second end cap is provided with a connecting channel, an oil inlet (111) being provided in a side wall area of the sealing body at the lubrication chamber, the connecting channel communicating with the oil inlet, thereby communicating the reservoir chamber with the lubrication chamber.

9. The lubrication device as recited in claim 8, wherein a diameter of said oil inlet is provided in a range of 5-7 mm.

10. The lubrication device according to claim 1, wherein a first adjusting pressure cap (105) and a second adjusting pressure cap (106) are respectively provided at upper ends of the first packing set and the second packing set, and the first adjusting pressure cap and the second adjusting pressure cap are used for adjusting installation of the first packing set and the second packing set.