Continuous pumping wellhead sealing device

Abstract

The utility model discloses a continuous pumping wellhead sealing device which comprises a first-stage sealing device and a second-stage sealing device, and the lower end of the first-stage sealing device is connected with the upper end of the second-stage sealing device. The first-stage sealing device is oppositely provided with two first-stage sealing mechanisms; the first-stage sealing mechanism comprises a first-stage guide cylinder and a first-stage linear motion rubber plug in the first-stage guide cylinder; the secondary sealing device is oppositely provided with two secondary sealing mechanisms; the second-stage sealing mechanism comprises a second-stage guide cylinder, a second-stage linear motion rubber plug and a second-stage sealing gate, according to the continuous pumping wellhead sealing device, through alternate application of an upper stage and a lower stage, the operation of replacing the packing without stopping a well can be achieved, secondary maintenance operation can be carried out through the sealing gate, risks caused by well stopping are reduced, and the oil extraction time rate and the working efficiency of workers are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead sealing devices, in particular to a non-stop pumping wellhead sealing device. Background Art

[0002] During the oil production process, the bare rod of the pumping well connects the pumping unit suspension rope device and the downhole pumping rod column to drive the pumping pump to reciprocate. The wellhead and the bare rod are sealed by a packing box. The bare rod sealer is an important wellhead device to ensure the normal production of the pumping unit. The wellhead bare rod sealer commonly used on site is generally composed of packing and other parts. This type of bare rod sealer has a good sealing effect, but its structure is complex. In recent years, a new type of bare rod sealer that does not require special packing and can achieve continuous pumping and packing has also appeared. Its disadvantage is that the deviation adjustment device is not reasonable enough. When adjusting the deviation, the 6 bolts of the flange need to be removed, which is a large workload. When there is pressure at the wellhead, the deviation adjustment operation cannot be performed. The function and performance of the wellhead sealing device directly affect the crude oil production.

[0003] The current oil field is in a high water content period, and mechanical oil production is mainly carried out. Due to the high water content, the packing of the wellhead sealing device moves up and down with the wellhead bare rod. The sealing filler is subjected to the effects of high temperature, high pressure and the external environment of the wellhead, which can easily cause the filler to be damaged, resulting in a short service life, loose sealing, oil and water leakage, resulting in crude oil loss and oil leakage at the wellhead, polluting the environment, and requiring frequent replacement of packing. Frequent well shutdowns to replace sealing fillers cause a decrease in oil well production. After replacing the packing, the wellhead equipment must be cleaned, and the labor intensity of employees is high and the work efficiency is low.

[0004] Publication (announcement) number: CN210622755U, discloses a SAGD oil well two-stage polished rod sealing device, including a packing box lower joint, an upper gate plate, a lower gate plate and a cavity, the top of the cavity is connected to the packing box lower joint by a thread, the front end and the upper part of the upper gate plate are equipped with an upper gate plate sealing rubber core; a sealing groove is opened on the lower gate plate, and a grease injection hole is arranged at the lower middle position of the cavity, the grease injection hole is communicated with the interior of the cavity, and sealing grease is injected into the grease injection sealing groove on the lower gate plate through the grease injection hole to form a seal.

[0005] Publication (announcement) number: CN204532206U, discloses an oil production polished rod sealer and an oil production device. The oil production polished rod sealer comprises: a sealer housing, a first end of the sealer housing is used to connect to an oil production tree, a second end of the sealer housing is used to connect to a packing box, a polished rod accommodating cavity for accommodating a polished rod is provided in the sealer housing, and the polished rod accommodating cavity extends from the first end to the second end of the sealer housing; at least one gate device isolates the sealer from the oil well to realize the replacement of the polished rod or the packing box under pressure.

[0006] Publication (announcement) number: CN106468150A, discloses a bare rod sealing device, including: a pumping wellbore, a pumping wellbore packing is arranged in the pumping wellbore, and a pumping bare rod, the pumping bare rod is arranged in the pumping wellbore and sealed by the pumping wellbore packing; a valve is arranged in the pumping wellbore, and the valve is arranged below the pumping wellbore packing.

[0007] The above-mentioned prior art can only maintain the upper sealing equipment without stopping the well when performing equipment maintenance, and cannot perform maintenance on the lower sealing equipment without stopping the well.

[0008] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from the present utility model. Regarding more technical features, technical problems to be solved and the beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Utility Model Content

[0009] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide a wellhead sealing device that can be used without stopping the pumping, so as to achieve maintenance of the packing and all sealing devices without stopping the well.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] The non-stop pumping wellhead sealing device comprises a primary sealing device and a secondary sealing device, wherein the lower end of the primary sealing device is connected to the upper end of the secondary sealing device; the primary sealing device comprises two primary sealing mechanisms arranged opposite to each other; the primary sealing mechanism comprises a primary guide cylinder and a primary linear motion rubber plug inside the cylinder; the secondary sealing device comprises two secondary sealing mechanisms arranged opposite to each other; the secondary sealing mechanism comprises a secondary guide cylinder and a secondary linear motion rubber plug inside the cylinder, and a secondary sealing gate.

[0012] Further, the secondary sealing gate includes an annular seat and a sealing plate;

[0013] Specifically, the annular seat is provided with a concave platform, the concave platform faces the wellhead, and the sealing plate can be seated in the concave platform;

[0014] Specifically, the upper end of the sealing plate is connected to the annular seat through a movable connecting piece, and the annular seat, the sealing plate and the movable connecting piece are all made of rubber;

[0015] Specifically, the secondary sealing gate is arranged in a convex ring in the secondary guide cylinder;

[0016] The secondary guide cylinder is provided with a sealing plate accommodating groove.

[0017] Furthermore, the lower end of the primary sealing device is connected to the upper end of the secondary sealing device via a primary clamp;

[0018] Specifically, the lower end of the secondary sealing device is connected to the wellhead cross-piece through a secondary clamp.

[0019] Furthermore, the primary sealing device comprises a primary wellhead packing box, and two primary sealing mechanisms are arranged opposite to each other on the side wall of the primary wellhead packing box;

[0020] Specifically, the first-level linear motion rubber plug includes a first-level gland, a first-level propulsion screw, and a first-level rubber plug. The inner port of the first-level guide cylinder is connected to the first-level wellhead packing box. The outer port of the first-level wellhead packing box is provided with a first-level gland. The first-level propulsion screw is threadedly connected to the inner wall of the first-level gland. The first-level rubber plug is arranged in the guide cylinder, and the first-level rubber plug is movably connected to the first-level propulsion screw through a first-level connecting block.

[0021] Specifically, the inner wall of the primary guide cylinder is provided with a primary guide track, the primary rubber insert is provided with a convex key that cooperates with the primary guide track, and the exposed portion of the primary propulsion screw is provided with a primary clamping nut.

[0022] Furthermore, the primary rubber plug is a U-shaped sealing plug, the front ends of the two plug arms of the primary rubber plug are tooth-shaped structures, and the diameter of the circle formed by the teeth of the two primary rubber plugs is smaller than the bare rod.

[0023] Furthermore, the first-level rubber plug is fixedly connected to the first-level connecting block;

[0024] Specifically, the primary connecting block is provided with a bolt groove, a primary connecting bolt is placed in the bolt groove, the head of the primary connecting bolt is in the bolt groove, and the thread portion of the primary connecting bolt passes through the primary connecting block and is fixedly connected to the primary advancing screw.

[0025] Furthermore, a first-level large sealing ring is provided between the first-level gland and the first-level guide cylinder;

[0026] Specifically, a first-level small sealing ring is provided between the first-level gland and the first-level advancing screw;

[0027] Specifically, the first-level wellhead packing box is provided with an oil receiving groove above the first-level guide cylinder.

[0028] Furthermore, the secondary sealing device comprises a secondary wellhead packing box, and two secondary sealing mechanisms are arranged opposite to each other on the side wall of the secondary wellhead packing box;

[0029] Specifically, the secondary linear motion rubber plug includes a secondary gland, a secondary propulsion screw, and a secondary rubber plug. The inner port of the secondary guide cylinder is connected to the secondary wellhead packing box. The outer port of the secondary wellhead packing box is provided with a secondary gland. The secondary propulsion screw is threadedly connected to the inner wall of the secondary gland. The secondary rubber plug is arranged in the guide cylinder. The secondary rubber plug is movably connected to the secondary propulsion screw through a secondary connection block.

[0030] Specifically, the inner wall of the secondary guide cylinder is provided with a secondary guide track, the secondary rubber plug is provided with a convex key matched with the secondary guide track, and the exposed part of the secondary propulsion screw is provided with a secondary clamping nut;

[0031] Specifically, the secondary rubber plug can be retracted outside the secondary sealing gate, so that the secondary sealing gate seals the entire inner cavity of the secondary guide cylinder.

[0032] Furthermore, the secondary guide cylinder is also provided with an oil drain hole between the secondary sealing gate and the secondary gland, and the oil drain hole is sealed with a sealing plug;

[0033] Specifically, after the secondary sealing mechanism completes the sealing of the polished rod, the sealing plate contacts the secondary rubber plug or the side wall of the secondary connecting block.

[0034] Furthermore, the secondary rubber plug is a U-shaped sealing plug, the front ends of the two plug arms of the secondary rubber plug are tooth-shaped structures, and the diameter of the circle formed by the teeth of the two secondary rubber plugs is smaller than the bare rod;

[0035] Specifically, the secondary rubber plug is fixedly connected to the secondary connection block;

[0036] Specifically, the secondary connection block is provided with a bolt groove, a secondary connection bolt is placed in the bolt groove, the head of the secondary connection bolt is in the bolt groove, and the thread portion of the secondary connection bolt passes through the secondary connection block and is fixedly connected to the secondary advancing screw;

[0037] Specifically, the secondary rubber plug is a U-shaped sealing plug, the front ends of the two plug arms of the secondary rubber plug are tooth-shaped structures, and the diameter of the circle formed by the teeth of the two secondary rubber plugs is smaller than the bare rod;

[0038] Specifically, a secondary large sealing ring is provided between the secondary gland and the secondary guide cylinder;

[0039] Specifically, a secondary small sealing ring is arranged between the secondary gland and the secondary advancing screw.

[0040] Compared with the prior art, the utility model has the following beneficial effects:

[0041] 1. The non-stop pumping wellhead sealing device provided by the utility model can replace the original wellhead packing box and wellhead alignment equipment, and can adapt to the connection with the original wellhead by changing the connection mode, and has wide versatility.

[0042] 2. The non-stop pumping wellhead sealing device provided by the utility model has universal internal connections and seals, which reduces the reserve of spare parts.

[0043] 3. The non-stop pumping wellhead sealing device provided by the utility model can seal the wellhead at both the upper and lower levels, and can be used alone or at the same time to enhance the sealing effect, thereby improving the safety of the wellhead.

[0044] 4. The non-stop pumping wellhead sealing device provided by the utility model can realize the replacement of packing without stopping the well through the alternating application of the upper and lower levels, and can also perform secondary maintenance operations through the sealing gate, thereby reducing the risks caused by well shutdown and improving the oil production time rate and the work efficiency of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the non-stop pumping wellhead sealing device of the utility model;

[0046] Figure 2 This is a schematic diagram of the internal structure of the non-stop pumping wellhead sealing device of the utility model;

[0047] Figure 3 It is a structural schematic diagram of the secondary sealing gate of the utility model.

[0048] In the figure: 1, primary sealing device; 2, secondary sealing device; 3, secondary clamp; 4, primary wellhead packing box; 5, primary rubber plug; 6, primary connecting block; 7, primary connecting bolt; 8, primary gland; 9, primary push screw; 10, primary clamping nut; 11, primary guide rail; 12, primary large sealing ring; 13, primary small sealing ring; 14, secondary sealing gate; 14a, annular seat; 14b, sealing plate; 14c, movable connecting piece; 15, secondary wellhead packing box; 16, secondary gland; 17, secondary push screw; 18, secondary guide rail; 19, bare rod. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] Embodiment 1:

[0051] See also Figures 1 to 3 The utility model provides a non-stop wellhead sealing device, comprising a primary sealing device 1 and a secondary sealing device 2. The lower end of the primary sealing device 1 is connected to the upper end of the secondary sealing device 2 through a primary clamp, and the lower end of the secondary sealing device 2 is connected to the wellhead cross-way through a secondary clamp 3. The primary sealing device 1 is provided with two primary sealing mechanisms opposite to each other, and the secondary sealing device 2 is provided with two secondary sealing mechanisms opposite to each other.

[0052] The primary sealing device 1 includes a primary wellhead packing box 4, two primary sealing mechanisms are arranged oppositely on the side wall of the primary wellhead packing box 4, the primary sealing mechanism includes a primary guide cylinder, a primary pressure cover 8, a primary push screw 9, and a primary rubber plug 5. The inner port of the primary guide cylinder is connected to the primary wellhead packing box 4, the outer port of the primary wellhead packing box 4 is provided with a primary pressure cover 8, the primary push screw 9 is threadedly connected to the inner wall of the primary pressure cover 8, the primary rubber plug 5 is arranged in the guide cylinder, and the primary rubber plug 5 is connected by The primary connecting block 6 is movably connected to the primary propulsion screw 9, the primary rubber plug 5 is a U-shaped sealing plug, the front ends of the two plug arms of the primary rubber plug 5 are toothed structures, the diameter of the circle formed by the two pairs of teeth of the primary rubber plug 5 is smaller than the light rod 19, the inner wall of the primary guide cylinder is provided with a primary guide rail 11, the primary rubber plug 5 is provided with a convex key that cooperates with the primary guide rail 11, and the exposed part of the primary propulsion screw 9 is provided with a primary clamping nut 10, and the primary clamping nut 10 is used to lock the primary propulsion screw 9.

[0053] The first-stage propulsion screw 9 is screwed in and out through the thread, driving the connecting block 6 and the first-stage rubber plug 5 connected thereto to move together.

[0054] Among them, the clamping nut 10 is tightened after the primary propulsion screw 9 moves into place, so as to fix the primary propulsion screw 9.

[0055] Among them, the toothed structure makes the primary rubber plug 5 more tightly sealed, and the primary guide rail 11, the convex key, and the primary connecting block 6 jointly convert the rotation of the primary propulsion screw 9 into the linear motion of the primary rubber plug 5 to avoid rotational deviation.

[0056] Specifically, the first-level rubber plug 5 is fixedly connected to the first-level connecting block, the first-level connecting block 6 is provided with a bolt groove, a first-level connecting bolt 7 is placed in the bolt groove, the head of the first-level connecting bolt 7 is in the bolt groove, and the thread portion of the first-level connecting bolt 7 passes through the first-level connecting block 6 and is fixedly connected to the first-level advancing screw 9, so that the first-level connecting block 6 can rotate without following the first-level advancing screw 9.

[0057] Specifically, a large primary sealing ring 12 is provided between the primary gland 8 and the primary guide cylinder, and a small primary sealing ring 13 is provided between the primary gland 8 and the primary propulsion screw 9, so as to achieve complete sealing of the primary gland 8 and avoid leakage of crude oil.

[0058] Furthermore, the first-level wellhead packing box 4 is provided with a bell mouth above the first-level guide cylinder, which is called an oil receiving groove and is used to collect and store a small amount of crude oil brought out when the polished rod 19 moves up and down.

[0059] The secondary sealing device 2 is similar to the primary sealing device 1. The secondary sealing device 2 includes a secondary wellhead packing box 15. Two secondary sealing mechanisms are arranged opposite to each other on the side wall of the secondary wellhead packing box 15. The secondary sealing mechanism includes a secondary guide cylinder, a secondary gland 16, a secondary push screw 17, and a secondary rubber plug. The inner port of the secondary guide cylinder is connected to the secondary wellhead packing box 15. The outer port of the secondary wellhead packing box 15 is provided with a secondary gland 16. The secondary push screw 17 is threadedly connected to the inner wall of the secondary gland 16. The secondary rubber plug is arranged on the guide cylinder. Into the cylinder, the secondary rubber plug is movably connected with the secondary propulsion screw 17 through the secondary connecting block. The secondary rubber plug is a U-shaped sealing plug. The front ends of the two plug arms of the secondary rubber plug are toothed structures. The diameter of the circle formed by the teeth of the two secondary rubber plugs is smaller than the light rod 19. The inner wall of the secondary guide cylinder is provided with a secondary guide rail 18. The secondary rubber plug is provided with a convex key that cooperates with the secondary guide rail 18. The exposed part of the secondary propulsion screw 17 is provided with a secondary clamping nut 10, and the secondary clamping nut 10 is used to lock the secondary propulsion screw 17.

[0060] Specifically, the secondary rubber plug is fixedly connected to the secondary connecting block, the secondary connecting block is provided with a bolt groove, a secondary connecting bolt is placed in the bolt groove, the head of the secondary connecting bolt is in the bolt groove, and the thread portion of the secondary connecting bolt passes through the secondary connecting block and is fixedly connected to the secondary advancing screw 17, so that the secondary connecting block can rotate without following the secondary advancing screw 17.

[0061] Specifically, a secondary large sealing ring is provided between the secondary gland 16 and the secondary guide cylinder, and a secondary small sealing ring is provided between the secondary gland 16 and the secondary propulsion screw, so as to achieve complete sealing of the secondary gland 16 and avoid leakage of crude oil.

[0062] Furthermore, a secondary sealing gate 14 is provided in the secondary guide cylinder, and the secondary rubber plug can be retracted outside the secondary sealing gate 14, so that the secondary sealing gate 14 seals the entire inner cavity of the secondary guide cylinder, which is convenient for replacing the internal secondary rubber plug, secondary large sealing ring, and secondary small sealing ring.

[0063] The secondary sealing gate 14 includes an annular seat 14a and a sealing plate 14b. The annular seat 14a is provided with a concave platform, which faces the wellhead. The sealing plate 14b can sit in the concave platform. The upper end of the sealing plate 14b is connected to the annular seat 14a through a movable connecting piece 14c. The annular seat 14a, the sealing plate 14b and the movable connecting piece 14c are all made of rubber. The secondary sealing gate 14 is deformed and collapsed by itself, and then pushed into the convex ring provided in the secondary guide cylinder by a tool. The secondary guide cylinder is also provided with an oil drain hole between the secondary sealing gate 14 and the secondary gland 16. The oil leakage hole is sealed with a sealing plug. Before the sealing plate 14b is pushed open and the secondary rubber plug seals the polished rod 19, some crude oil will pass through the secondary sealing gate 14 and leak out through the oil leakage hole. The secondary guide cylinder is provided with a sealing plate accommodating groove, so that after the secondary rubber plug pushes open the sealing plate 14b, the sealing plate 14b will not hinder the advancement of the secondary rubber plug. After the secondary sealing mechanism completes the sealing of the polished rod 19, the sealing plate 14b contacts the secondary rubber plug or the side wall of the secondary connecting block to prevent the sealing plate 14b from being stuck and caused to fail by the step between the secondary connecting block and the secondary propulsion screw 17.

[0064] Embodiment 2:

[0065] This embodiment provides a method for using a wellhead sealing device without stopping pumping, specifically comprising the following steps:

[0066] S1. Set the packing in the first-level wellhead packing box 4, connect the second-level sealing device 2 with the wellhead spool, put the polished rod 19 in, screw in the first-level push screw 9, make the two first-level rubber inserts 5 pairs of teeth seal the polished rod 19, and tighten the first-level clamping nut 10;

[0067] At this time, the sealing plate 14b is pressed against the annular seat 14a by the crude oil, sealing the entire inner cavity of the secondary guide cylinder;

[0068] S2. When the primary packing needs to be replaced, screw in the secondary push screw 17, so that the two secondary rubber inserts are aligned with the teeth to seal the polished rod 19, tighten the primary compression nut, and replace the primary packing;

[0069] S3. When the primary sealing device 1 needs to be maintained, screw in the secondary push screw 17 to make the two secondary rubber inserts fit the teeth to assemble the sealing polished rod 19, tighten the secondary compression nut, remove the oil drain plug, and drain the crude oil that has passed through the secondary sealing gate 14 through the oil drain hole;

[0070] Then remove the primary gland 8 to maintain the primary sealing device 1;

[0071] S4. When the secondary sealing device 2 needs to be maintained, the secondary rubber is inserted and withdrawn to the outside of the secondary sealing gate 14. The secondary sealing gate 14 seals the entire inner cavity of the secondary guide cylinder. Remove the secondary gland 16 for maintenance.

[0072] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0073] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0074] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A non-stop pumping wellhead sealing device, including a primary sealing device and a secondary sealing device, characterized in that: The lower end of the primary sealing device is connected to the upper end of the secondary sealing device; The primary sealing device comprises two primary sealing mechanisms arranged opposite to each other; the primary sealing mechanism comprises a primary guide cylinder and a primary linear motion rubber plug inside the cylinder; The secondary sealing device comprises two secondary sealing mechanisms arranged opposite to each other; the secondary sealing mechanism comprises a secondary guide cylinder and a secondary linear motion rubber plug and a secondary sealing gate inside the cylinder.

2. The non-stop pumping wellhead sealing device according to claim 1, characterized in that: The secondary sealing gate includes an annular seat and a sealing plate; The annular seat is provided with a concave platform, the concave platform faces the wellhead, and the sealing plate can be seated in the concave platform; The upper end of the sealing plate is connected to the annular seat through a movable connecting piece, and the annular seat, the sealing plate and the movable connecting piece are all made of rubber; The secondary sealing gate is arranged in a convex ring in the secondary guide cylinder; The secondary guide cylinder is provided with a sealing plate accommodating groove.

3. The non-stop pumping wellhead sealing device according to claim 1, characterized in that: The lower end of the primary sealing device is connected to the upper end of the secondary sealing device through a primary clamp; The lower end of the secondary sealing device is connected to the wellhead cross through a secondary clamp.

4. The non-stop pumping wellhead sealing device according to claim 1, characterized in that: The primary sealing device comprises a primary wellhead packing box, and two primary sealing mechanisms are arranged opposite to each other on the side wall of the primary wellhead packing box; The first-level linear motion rubber plug includes a first-level gland, a first-level propulsion screw, and a first-level rubber plug. The inner port of the first-level guide cylinder is connected to the first-level wellhead packing box. The outer port of the first-level wellhead packing box is provided with a first-level gland. The first-level propulsion screw is threadedly connected to the inner wall of the first-level gland. The first-level rubber plug is arranged in the guide cylinder and is movably connected to the first-level propulsion screw through a first-level connecting block. The inner wall of the first-level guide cylinder is provided with a first-level guide track, the first-level rubber insert is provided with a convex key matched with the first-level guide track, and the exposed part of the first-level propulsion screw is provided with a first-level clamping nut.

5. The non-stop pumping wellhead sealing device according to claim 4 is characterized in that: The first-level rubber plug is a U-shaped sealing plug, the front ends of the two plug arms of the first-level rubber plug are tooth-shaped structures, and the diameter of the circle formed by the teeth of the two first-level rubber plugs is smaller than the bare rod.

6. The non-stop pumping wellhead sealing device according to claim 4, characterized in that: The first-level rubber plug is fixedly connected to the first-level connecting block; The primary connecting block is provided with a bolt groove, in which a primary connecting bolt is placed, the head of the primary connecting bolt is in the bolt groove, and the thread portion of the primary connecting bolt passes through the primary connecting block and is fixedly connected to the primary advancing screw.

7. The non-stop pumping wellhead sealing device according to claim 4, characterized in that: A first-level large sealing ring is arranged between the first-level gland and the first-level guide cylinder; A first-level small sealing ring is arranged between the first-level gland and the first-level advancing screw; The first-level wellhead packing box is provided with an oil receiving groove above the first-level guide cylinder.

8. The non-stop pumping wellhead sealing device according to claim 2, characterized in that: The secondary sealing device comprises a secondary wellhead packing box, and two secondary sealing mechanisms are arranged opposite to each other on the side wall of the secondary wellhead packing box; The secondary linear motion rubber plug includes a secondary gland, a secondary propulsion screw, and a secondary rubber plug. The inner port of the secondary guide cylinder is connected to the secondary wellhead packing box. The outer port of the secondary wellhead packing box is provided with a secondary gland. The secondary propulsion screw is threadedly connected to the inner wall of the secondary gland. The secondary rubber plug is arranged in the guide cylinder and is movably connected to the secondary propulsion screw through a secondary connection block. The inner wall of the secondary guide cylinder is provided with a secondary guide track, the secondary rubber plug is provided with a convex key matched with the secondary guide track, and the exposed part of the secondary propulsion screw is provided with a secondary clamping nut; The secondary rubber plug can be retracted outside the secondary sealing gate, so that the secondary sealing gate seals the entire inner cavity of the secondary guide cylinder.

9. The non-stop pumping wellhead sealing device according to claim 8, characterized in that: The secondary guide cylinder is also provided with an oil drain hole between the secondary sealing gate and the secondary gland, and the oil drain hole is sealed with a sealing plug; After the secondary sealing mechanism completes the sealing of the polished rod, the sealing plate contacts the secondary rubber plug or the side wall of the secondary connecting block.

10. The non-stop pumping wellhead sealing device according to claim 8, characterized in that: The secondary rubber plug is a U-shaped sealing plug, the front ends of the two plug arms of the secondary rubber plug are tooth-shaped structures, and the diameter of the circle formed by the two secondary rubber plugs is smaller than the polished rod; The secondary rubber plug is fixedly connected to the secondary connecting block; The secondary connection block is provided with a bolt groove, a secondary connection bolt is placed in the bolt groove, the head of the secondary connection bolt is in the bolt groove, and the thread portion of the secondary connection bolt passes through the secondary connection block and is fixedly connected to the secondary advancing lead screw; The secondary rubber plug is a U-shaped sealing plug, the front ends of the two plug arms of the secondary rubber plug are tooth-shaped structures, and the diameter of the circle formed by the teeth of the two secondary rubber plugs is smaller than the bare rod; A secondary large sealing ring is provided between the secondary gland and the secondary guide cylinder; A secondary small sealing ring is arranged between the secondary gland and the secondary advancing lead screw.

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