CN202970587U - A wellhead sealer - Google Patents

Abstract

The utility model discloses a well head sealer is equipped with in the lower part of this well head sealer and screws out cover (3) threaded connection connecting pipe (5), detach packing box and press cap (1) back, rotatory screw out cover (3) and make its downstream just can expose packing (41), and the operation workman need not reuse the screwdriver alright take out the packing, operates simple more, convenient and high-efficient. In addition, packing groups are compressed from the upper direction and the lower direction, and a better compression sealing effect can be obtained under the condition that the number of the packing groups is not increased.

Description

A wellhead sealer

technical field

The utility model relates to the technical field of oil well sealing, in particular to a spin-out wellhead polished rod sealer used at the head of an oil pumping well.

Background technique

Wellhead sealer is a kind of sealing device commonly used in the field of oil production, such as Chinese patent CN 2608676Y, disclosed on March 31, 2004 "A Kind of Oil Pumping Wellhead Polished Rod Sealer", the wellhead polished rod sealer includes packing jacket The top of the packing is connected with the packing pressure pad in the packing box press cap, and the lower part of the packing box press cap is connected with the packing cover.

With the gradual increase of the viscosity of the crude oil produced in the oil field, the management of the wellbore surface is also becoming more and more difficult, so it is necessary to frequently increase and replace the packing in the wellhead sealer. In the prior art, when replacing the packing, it is necessary to remove the packing case pressing cap and packing pad to expose the packing, and then use a screwdriver to remove the old packing before replacing it with a new packing. It is time-consuming and labor-intensive, especially in winter. In addition, this sealer can only be sealed by pressing the packing with the upper packing box pressure cap. In order to ensure the sealing effect, the number of packings must be increased, which not only increases the amount of packing used, but also increases the cost. Reduced the labor intensity of on-site operators.

Utility model content

In order to solve the technical problem of inconvenient packing replacement of the wellhead sealer in the prior art, the utility model provides a wellhead sealer. After the cap is pressed, the packing can be exposed by rotating the unscrewing sleeve and moving it down, so that the packing can be easily replaced.

The technical scheme adopted by the utility model to solve the technical problem is: a wellhead sealer, including a unscrewing sleeve and a packing group arranged in the unscrewing sleeve, the top of the packing group and the disc in the packing box pressure cap The root box gland is connected, and the lower part of the packing box gland is connected with the unscrewing sleeve. The inner wall is provided with an internal thread, the outer wall of the connecting pipe is provided with an external thread matching the internal thread of the unscrewing sleeve, and the unscrewing sleeve can move up and down relative to the connecting pipe.

After the wellhead sealer is installed, when it is necessary to replace the packing in the packing group, first remove the packing box pressure cap and the packing box gland, then rotate the unscrewed sleeve and make it move down, and the packing is convenient It can be exposed to the outside of the unscrewed sleeve sequentially from top to bottom, and then the old packing is removed for replacement. Compared with the prior art, the operator does not need to use a screwdriver to take out the packing, and the operation is simple and convenient. In addition, in the stage of installing the wellhead sealer, after installing the gland of the packing box and the gland of the packing box on the unscrewed sleeve, rotate the unscrewed sleeve and make it move downwards, the connecting pipe can be connected from the lower end of the packing group. Press the packing group, which can cooperate with the packing box pressing cap and the packing box cover on the top of the packing group to compress the packing group from the upper and lower directions. Without increasing the number of packing, it can Get a better pinch seal.

Preferably, the unscrewing sleeve is cylindrical, the entire inner wall of the unscrewing sleeve is provided with internal threads, and the length of the unscrewing sleeve is less than or equal to the length of the external thread at the connecting end of the connecting pipe and the unscrewing sleeve.

Preferably, the outer wall of the unscrewing sleeve is provided with a handle.

Preferably, the inner wall of the gland of the packing box is provided with a protruding ring, and the lower surface of the protruding ring abuts against the top end of the gland of the packing box.

Preferably, a handle is provided on the outer wall of the packing box pressing cap.

Preferably, the packing box pressing cap and the unscrewing sleeve are threaded.

Preferably, the outer diameter of the gland of the packing box matches the inner diameter of the unscrewed sleeve.

Preferably, a flange is provided on the top of the gland of the packing box, and the outer diameter of the flange matches the inner diameter of the gland of the packing box.

Preferably, the packing set includes multiple packings stacked from top to bottom.

The beneficial effect of the utility model is that the operator can take out the packing without using a screwdriver, and the operation is simpler, more convenient and more efficient. In addition, compressing the packing group from the upper and lower directions can obtain a better compression and sealing effect without increasing the number of packings.

Description of drawings

The wellhead sealer described in the utility model will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is an assembly drawing of the wellhead sealer described in the utility model.

Fig. 2 is a cross-sectional view of a packing box pressing cap.

Fig. 3 is a sectional view of the gland of the packing box.

1. Packing box pressure cap, 11. Protruding ring, 12. Handle, 2. Packing box cover, 21. Flange, 3. Unscrew sleeve, 31. Handle, 4. Packing group, 41 .Packing, 5. Connecting pipe, 6. Polished rod.

Detailed ways

The wellhead sealer described in the utility model will be described in detail below in conjunction with the accompanying drawings. A wellhead sealer, comprising a unscrewing sleeve 3 and a packing set 4 arranged in the unscrewing sleeve, the top of the packing set 4 is connected to the packing box gland 2 in the packing box pressing cap 1, and the packing box The lower part of the pressure cap 1 is connected with the unscrewing sleeve 3, and the lower part of the unscrewed sleeve 3 is also connected with a connecting pipe 5. The bottom end of the packing group 4 is in contact with the connecting pipe 5, and the inner wall of the unscrewing sleeve 3 is provided with internal threads. The outer wall of the connecting pipe 5 is provided with an external thread that matches the internal thread of the unscrewing sleeve 3, and the unscrewing sleeve 3 can move up and down relative to the connecting pipe 5, as shown in FIG. 1 .

After the wellhead sealer is installed, the polished rod 6 passes through the packing box gland 1, the packing box gland 2, the packing group in the screw-out sleeve 3 and the connecting pipe 5 sequentially from top to bottom. When it is necessary to replace the packing 41 in the packing group 4, first remove the packing box pressing cap 1 and the packing box pressing cover 2, then rotate the unscrewing sleeve 3 and move it downward, and the packing 41 can be It is exposed to the outside of the unscrewed sleeve 3 successively from top to bottom, and at this time, the old packing 41 is removed for replacement. Compared with the prior art, the operator does not need to use a screwdriver to take out the packing 41, and the operation is simple and convenient. In addition, in the stage of installing the wellhead sealer, after installing the packing box gland 1 and the packing box gland 2 on the unscrewing sleeve 3, the unscrewing sleeve 3 is rotated and moved downwards, and the connecting pipe 5 can be pulled out from the disk. The lower end of the root group 4 presses the packing group 4 upwards, which can cooperate with the packing box pressing cap 1 and the packing box gland 2 at the top of the packing group 4 to compress the packing group from the upper and lower directions. In the case that the number of the packing 41 does not increase, a better compression and sealing effect can be obtained.

In order to make it more convenient to take out the packing, the unscrewed sleeve 3 is cylindrical, and the entire inner wall of the unscrewed sleeve 3 is provided with internal threads. External thread length. That is, the length of the unscrewing sleeve 3 along the axial direction of the unscrewing sleeve 3 is less than or equal to the length of the external thread arranged downward from the top of the connecting pipe 5, and the entire inner wall of the unscrewing sleeve 3 can be threadedly matched with the outer wall of the connecting pipe 5 connect. In this way, rotating the unscrewing sleeve 3 and moving it downward can finally make the position of the top of the unscrewing sleeve 3 lower than that of the top of the connecting pipe 5, and the packing group 4 can be completely exposed outside the unscrewing sleeve 3, and the packing can be replaced. 41 will be more convenient. If the length of the external thread on the outer wall of the connecting pipe is too long, the manufacturing cost will be increased, so it is only necessary to arrange the external thread on the upper end and the lower end of the outer wall of the connecting pipe, and there may be no external thread in the middle.

In order to rotate and unscrew the sleeve 3 conveniently, the outer wall of the unscrewed sleeve 3 is provided with a handle 31 , preferably the handle 31 is welded on the outer wall of the unscrewed sleeve 3 .

In order to better make the packing box pressing cap 1 press the packing group 4 through the packing box gland 2, the inner wall of the packing box pressing cap 1 is provided with a protruding ring 11, and the lower surface of the protruding ring 11 is in contact with the The top of the packing box gland 2 abuts. In addition, there is a threaded connection between the packing box pressing cap 1 and the unscrewing sleeve 3, and the outer wall of the packing box pressing cap 1 is provided with a handle 12, so that the packing box pressing cap 1 can be rotated by the handle 12 to compress the packing group 4 ,as shown in picture 2.

In order to make the packing box gland 2 compress the packing group 4 and ensure the compression and sealing effect, the outer diameter of the packing box gland 2 matches the inner diameter of the screw-out sleeve 3, thereby preventing the packing box gland 2 from being inserted into the screw Radial movement in sleeve 3. In addition, a flange 21 is provided on the top of the packing box gland 2, and the outer diameter of the flange 21 matches the inner diameter of the packing box gland 1, so that the packing box gland 2 and the packing box gland 1 can be increased. The force contact area between them makes the packing box gland 2 further compress the packing group 4, as shown in Figure 3.

The packing set 4 includes a plurality of packings 41 stacked from top to bottom.

The working process of the wellhead sealer described in the utility model is as follows:

When the opening sealer is installed and the packing 41 in the packing group 4 needs to be compressed, the handle 31 can be used to rotate the unscrewed sleeve 3 clockwise and move down in Fig. 41 is compressed, and then the packing box pressing cap 1 is rotated and moved down through the handle 12, and the packing box pressing cap 1 is moved down to drive the packing box pressing cover 2 to move down and press the packing 41 in the middle and upper part of the unscrewing sleeve 3 In this way, the packing group 4 is compressed twice, so that the packing sealing effect is better, and the utilization rate of the packing is greatly improved.

When the packing 41 needs to be replaced, first use the handle 12 to rotate the packing box pressing cap 1 counterclockwise and move up, and the force acting on the packing box pressing cap 2 will also be removed accordingly, and continue to rotate the packing box pressing cap 1 counterclockwise Finally, the packing box pressing cap 1 and the packing box pressing cover 2 are completely separated from the unscrewing sleeve 3 . Then the handle 31 is used to rotate the unscrewed sleeve 3 clockwise and move down, so that the packing 41 is completely exposed, and the packing 41 can be easily replaced. The wellhead sealer can be reassembled by reversing the operation. When packing is required, remove the packing box gland 1 and packing box gland 2, and rotate the unscrewing sleeve 3 to move up to leave enough space for the packing. Just enough space for installation.

The above is only a specific embodiment of the utility model, and it cannot limit the scope of utility model implementation, so the replacement of its equivalent components, or the equivalent changes and modifications made according to the patent protection scope of the utility model, should still belong to areas covered by this patent.

Claims (9)

1. wellhead sealing device, comprise and screw out cover (3) and be arranged on the packing group (4) that screws out in cover, gland for packing box (2) in the top of packing group (4) and packing box pressing cap (1) is connected, the bottom of packing box pressing cap (1) is connected with back-out cover (3), it is characterized in that: the bottom that screws out cover (3) also is connected with tube connector (5), the bottom of packing group (4) and tube connector (5) butt, the inwall that screws out cover (3) is provided with internal thread, the outer wall of tube connector (5) is provided with and the internal thread that screws out cover (3) external screw thread that is complementary, screwing out cover (3) can move up and down with respect to tube connector (5).

2. wellhead sealing device according to claim 1, it is characterized in that: screw out cover (3) and be cylindrical shape, the whole inwall that screws out cover (3) is provided with internal thread, screws out the length of cover (3) less than or equal to tube connector (5) and the external thread length that screws out cover (3) link.

3. wellhead sealing device according to claim 1, is characterized in that: screw out the outer wall that overlaps (3) and be provided with handle (31).

4. wellhead sealing device according to claim 1, it is characterized in that: the inwall of packing box pressing cap (1) arranges bossed annulus (11), the following table of the annulus of projection (11) and with the top butt of gland for packing box (2).

5. wellhead sealing device according to claim 1, it is characterized in that: the outer wall of packing box pressing cap (1) is provided with handle (12).

6. wellhead sealing device according to claim 1 is characterized in that: packing box pressing cap (1) with screw out between cover (3) as being threaded.

7. wellhead sealing device according to claim 1 is characterized in that: the external diameter of gland for packing box (2) is complementary with the internal diameter that screws out cover (3).

8. wellhead sealing device according to claim 1, it is characterized in that: the top of gland for packing box (2) is provided with flange (21), and the internal diameter of the external diameter of flange (21) and packing box pressing cap (1) is complementary.

9. any one described wellhead sealing device according to claim 1～8, it is characterized in that: packing group (4) comprises a plurality of packings (41) of stacked setting from the top down.

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