Oil field wellhead sealer

Abstract

The utility model relates to the technical field of oil field machinery, in particular to an oil field wellhead sealer. The polish rod is in close contact with the packing box, the top of the sealing shell is fixedly connected with a sealing cover, the bottom of the sealing shell is fixedly connected with a sealing base, a groove is formed in the sealing shell, and a movable plate is arranged in the groove; the positioning body is in a T shape, a groove is formed in the surface of the positioning body, a compression spring is arranged in the groove, and a column body is fixed to the end of the compression spring; the packing box has the beneficial effects that when an oil field machine works, if a polish rod is inclined or deviated due to large force, the packing box applies force to the positioning body, the positioning body enables the movable plate to move outwards and drives the ball body to slide and the limiting column to slide upwards, the limiting column is separated from the groove of the column body, and the column body is popped out by the compression spring at the moment; and the packing box returns to the central position.

Description

Technical Field

[0001] The utility model relates to the field of oilfield machinery, and particularly to an oilfield wellhead seal. Background Art

[0002] During the production process of oilfield pumping units, the stuffing box is a sealing device that seals between the wellhead and the polished rod. However, due to the complex well conditions of oil production wells at the oil production site, the polished rod of the pumping unit often wears out unevenly, thereby shortening the service life of the stuffing box. When there are scratches, corrosion, etc. on the surface of the polished rod, the wear of the stuffing box is accelerated, resulting in oil leakage from the oil well, causing oil and steam leakage and polluting the environment.

[0003] In the existing technology, research has been carried out on small-scale deflection of the polished rod, inclined sealing, etc.

[0004] However, if the force of the deflection and inclination of the polished rod is relatively large, the polished rod will tilt greatly, causing the polished rod and the stuffing box to impact the inside of the pipeline. Not only the packing and the polished rod are damaged, but it is also possible that the entire machine is damaged. Content of the Utility Model

[0005] The purpose of the utility model is to provide an oilfield wellhead seal to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical solution: An oilfield wellhead seal, the oilfield wellhead seal includes

[0007] A polished rod, which is in close contact with the stuffing box:

[0008] A sealing housing, the top of the sealing housing is fixedly connected with a sealing cover, the bottom of the sealing housing is fixedly connected with a sealing base, a groove is arranged inside the sealing housing, and a movable plate is arranged in the groove; and

[0009] A positioning body, the positioning body is T-shaped, a groove is arranged at the T surface end, a compression spring is arranged inside the groove, and a cylinder is fixed at the end of the compression spring.

[0010] Preferably, an upper sliding platform is arranged between the sealing cover and the stuffing box, the top end of the upper sliding platform is fixed on the surface of the sealing cover, a lower sliding platform is arranged between the sealing base and the stuffing box, and the bottom end of the lower sliding platform is fixed on the surface of the sealing base.

[0011] Preferably, spherical grooves are arranged at both ends of the movable plate, spheres are arranged inside the spherical grooves, and limiting columns are connected to the surfaces of the spheres.

[0012] Preferably, a groove is arranged inside the sealing housing, a positioning body is arranged in the groove, and a dielectric layer is arranged between the positioning body and the movable plate.

[0013] Preferably, the surface of the column body is provided with a groove, and the groove is in close fit with the surface of the limiting column.

[0014] Preferably, a connecting piece is provided at the bottom end of the sealing base, and the column body is divided into four groups.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] When the polished rod has a relatively large force to cause it to tilt or shift during the operation of the oilfield machine proposed by the present utility model, the packing box will give a force to the positioning body. The positioning body will cause the movable plate to move outwards, drive the sphere to slide at the same time, and the limiting column to slide upwards. The limiting column disengages from the groove of the column body. At this time, the compression spring pops out the column body, so that the packing box returns to the central position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is a sectional structural schematic diagram of the present utility model;

[0019] Figure 3 is Figure 2 an enlarged structural schematic diagram of A in

[0020] In the figure: 1 polished rod, 2 sealing cover, 3 sealing housing, 4 sealing base, 5 connecting piece, 6 upper smooth platform, 7 lower smooth platform, 8 packing box, 9 positioning body, 10 movable plate, 11 dielectric layer, 12 sphere, 13 spherical groove, 14 limiting column, 15 compression spring, 16 column body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to clearly and completely describe the purpose and technical solution of the present utility model, and make the advantages more clear, the following further details the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present utility model, rather than all of the embodiments, and are only used to explain the embodiments of the present utility model, not to limit the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment 1

[0023] Please refer to Figures 1 - 3The utility model provides a technical solution: an oilfield wellhead sealer, the oilfield wellhead sealer comprises a bare rod 1, the bare rod 1 is in close contact with a packing box 8: a sealing shell 3, a sealing cover 2 is fixedly connected to the top of the sealing shell 3, a sealing base 4 is fixedly connected to the bottom of the sealing shell 3, a groove is arranged inside the sealing shell 3, and a movable plate 10 is arranged in the groove; and a positioning body 9, the positioning body 9 is T-shaped, a groove is arranged at the T-face end, a compression spring 15 is arranged inside the groove, a column 16 is fixed at the end of the compression spring, an upper sliding platform 6 is arranged between the sealing cover 2 and the packing box 8, the top of the upper sliding platform 6 is fixed on the surface of the sealing cover 2, a lower sliding platform 7 is arranged between the sealing base 4 and the packing box 8, the bottom end of the lower sliding platform 7 is fixed on the surface of the sealing base 4, and the packing box 8 can be slightly offset left and right through the upper sliding platform 6 and the lower sliding platform 7.

[0024] Embodiment 2

[0025] On the basis of the first embodiment, spherical grooves 13 are provided at both ends of the movable plate 10, a sphere 12 is provided inside the spherical groove 13, a surface of the sphere 12 is connected to a limiting column 14, a groove is provided inside the sealed shell 3, a positioning body 9 is provided in the groove, a dielectric layer 11 is provided between the positioning body 9 and the movable plate 10, the positioning body 9 squeezes the dielectric layer 11, and the dielectric layer 11 squeezes the movable plate 10, so that the movable plate 10 moves outward.

[0026] Embodiment 3

[0027] On the basis of the second embodiment, a groove is provided on the surface of the column 16, and the groove is closely fitted with the surface of the limiting column 14. A connecting piece 5 is provided at the bottom end of the sealing base 4, and the column 16 is divided into four groups.

[0028] In actual use, the sealer is assembled on the wellhead through the connecting piece 5, and the machine is started to tightly connect the bare rod 1 and the packing box 8. The packing box 8 can slide left and right on a small scale through the upper sliding platform 6 and the lower sliding platform 7. When the offset is too large, the packing box 8 will hit the positioning body 9, and the positioning body 9 squeezes the medium layer 11, and the medium layer 11 squeezes the movable plate 10, so that the movable plate 10 moves outward. At this time, the spherical groove 13 at the outer end of the movable plate 10 drives the ball 12 to move, and the ball 12 drives the limiting column 14 to move up and down. When the limiting column 14 is separated from the groove on the column 16, the compression spring 15 is triggered to release the elastic force to make the column 16 pop outward to wrap the packing box 8, and the packing box 8 returns to the center position.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oilfield wellhead sealer, characterized in that: The oilfield wellhead sealer comprises The polished rod (1) is in close contact with the packing box (8): A sealed housing (3), wherein a sealing cover (2) is fixedly connected to the top of the sealed housing (3), a sealing base (4) is fixedly connected to the bottom of the sealed housing (3), a groove is provided inside the sealed housing (3), and a movable plate (10) is provided in the groove; and The positioning body (9) is T-shaped, a groove is arranged on the surface of the positioning body (9), a compression spring (15) is arranged inside the groove, and a column (16) is fixed to the end of the compression spring.

2. The oilfield wellhead sealer according to claim 1, characterized in that: An upper sliding platform (6) is provided between the sealing cover (2) and the packing box (8), the top end of the upper sliding platform (6) is fixed on the surface of the sealing cover (2), and a lower sliding platform (7) is provided between the sealing base (4) and the packing box (8), the bottom end of the lower sliding platform (7) is fixed on the surface of the sealing base (4).

3. The oilfield wellhead sealer according to claim 2, characterized in that: Spherical grooves (13) are formed at both ends of the movable plate (10), a sphere (12) is provided inside the spherical groove (13), and a limiting column (14) is connected to the surface of the sphere (12).

4. The oilfield wellhead sealer according to claim 3, characterized in that: The sealed housing (3) is provided with a groove inside, a positioning body (9) is provided in the groove, and a dielectric layer (11) is provided between the positioning body (9) and the movable plate (10).

5. The oilfield wellhead sealer according to claim 4, characterized in that: The surface of the column (16) is provided with a groove, and the groove is tightly fitted with the surface of the limiting column (14).

6. The oilfield wellhead sealer according to claim 5, characterized in that: A connecting piece (5) is provided at the bottom end of the sealing base (4), and the columns (16) are divided into four groups.

Images