CN212054584U - Pumping well polish rod sealing device - Google Patents

Abstract

The utility model provides a pumping well polished rod sealing device. The pumping well polish rod sealing device includes: a polish rod; the polished rod penetrates through the base; the packing assembly is connected with the base and positioned above the base, the packing assembly comprises a packing box and a plugging piece, the packing box is provided with a packing containing cavity and a packing injection port communicated with the packing containing cavity, the plugging piece can plug the packing injection port, and the polish rod penetrates through the packing containing cavity; the gland assembly is connected with the packing assembly and is positioned above the packing assembly, and the polish rod penetrates through the gland assembly. The utility model discloses solved prior art smooth rod sealing device's packing effectively and changed comparatively difficultly, increased staff intensity of labour's problem.

Description

Pumping well polish rod sealing device

Technical Field

The utility model relates to a pumping well technical field particularly, relates to a pumping well polished rod sealing device.

Background

At present, a polished rod of a pumping well is connected with a polished rod eye of the pumping unit and a downhole sucker rod string to drive an oil well pump to work in a reciprocating mode, and sealing filler adopted by a polished rod sealing device of the pumping well is usually circular rubber packing or rubber belt packing. However, for the above sealing packing, when the structure of the sealing packing is damaged, a worker needs to take out the old packing and put a new sealing packing into the sealing device, so that the operation of the worker on the sealing packing is difficult, and the labor intensity of the worker is increased. Meanwhile, waste fillers can cause raw material waste and environmental pollution to a certain extent.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a polish rod sealing device for pumping well to solve the problem of the prior art that the filler of the polish rod sealing device is difficult to replace and the labor intensity of the working personnel is increased.

In order to achieve the above object, the utility model provides a pumping well polished rod sealing device, include: a polish rod; the polished rod penetrates through the base; the packing assembly is connected with the base and positioned above the base, the packing assembly comprises a packing box and a plugging piece, the packing box is provided with a packing containing cavity and a packing injection port communicated with the packing containing cavity, the plugging piece can plug the packing injection port, and the polish rod penetrates through the packing containing cavity; the gland assembly is connected with the packing assembly and is positioned above the packing assembly, and the polish rod penetrates through the gland assembly.

Further, the plugging piece extends into the filler injection port and is in threaded connection with the filler injection port.

Further, the packing assembly further comprises: the first sealing element is arranged between the blocking piece and the filler injection opening so as to seal the connection part of the blocking piece and the filler injection opening.

Further, the gland assembly includes: a first gland; the second gland is connected with the first gland and the stuffing box, and is provided with a first mounting cavity; and the elastic piece is positioned in the first mounting cavity, the first end of the elastic piece is contacted with the first pressing cover, and the second end of the elastic piece provides elastic force for the filler positioned in the filler containing cavity to move towards one side of the base.

Further, the first gland is in threaded connection with the second gland, so that the first gland pushes the elastic piece by rotating the first gland along the preset direction, and the elastic piece compresses the packing in the packing accommodating cavity.

Further, first gland has the air vent with first installation cavity intercommunication, and the pumping well polished rod sealing device still includes: the oil gas that detects structure and vent department detects to give control module with the detected value transmission, when the detected value is greater than or equal to the default, control module control beam-pumping unit and polished rod stop motion.

Further, the gland assembly further comprises: the oil gas collection structure comprises a gas collection cavity and a gas guide pipeline, one end of the gas guide pipeline is communicated with the vent hole, the other end of the gas guide pipeline is communicated with the gas collection cavity, so that natural gas in the vent hole is guided into the gas collection cavity through the gas guide pipeline, and the detection structure is communicated with an exhaust port of the gas collection cavity.

Further, the second gland includes: one end of the sleeve is in threaded connection with the first gland, and the other end of the sleeve is in threaded connection with the stuffing box; the handle is arranged outside the sleeve and extends along the radial direction of the sleeve; the isolating ring sets up in the sleeve and with muffjoint, and the isolating ring can be passed to the elastic component, and the gland subassembly still includes: the ejector sleeve comprises an ejector, a second end of an elastic piece is in contact with a first end of the ejector, an isolation ring can be limited by the first end of the ejector, and the second end of the ejector has an arc-shaped surface so as to compress the filler in the filler containing cavity through the arc-shaped surface.

Further, the packing assembly still includes the flange structure of being connected with the stuffing box, and pumping well polished rod sealing device still includes: the third gland is provided with a second mounting cavity, the base is in threaded connection with the cavity wall of the second mounting cavity, and the flange structure is positioned in the second mounting cavity so as to enable the flange structure and the base to be pressed together by rotating the third gland; and the second sealing element is arranged between the flange structure and the base.

Further, the base includes: the base body is provided with a third mounting cavity and a through hole communicated with the third mounting cavity, and the through hole is used for the light rod to pass through; and the blowout prevention ball is arranged in the third mounting cavity, and when the polished rod is pulled out from the through hole, the blowout prevention ball moves towards the through hole under the action of the pressure and the buoyancy of gas and liquid in the oil well so as to plug the through hole.

Use the technical scheme of the utility model, the packing subassembly includes packing box and shutoff piece, and the packing box has the packing and holds the chamber and hold the filler filling opening that the chamber is linked together with the packing, but shutoff piece shutoff filler filling opening. Like this, the pumping well polished rod sealing device in this application uses the graininess to pack and seals the pumping well head, it holds the intracavity to pack to fill through the filler filling opening injection, when the filler in the pumping well polished rod sealing device has disappearance or defective, the staff takes off the shutoff piece, fill into to pack through annotating the material rifle and hold the intracavity, accomplish fill into the back with the shutoff piece shutoff fill opening again can, and then make the staff easier to the operation of filler, it is simple and convenient, it is comparatively difficult to have solved the packing change of smooth rod sealing device among the prior art, staff intensity of labour's problem has been increased.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a cross-sectional view of an embodiment of a polish rod sealing device for a pumping well according to the present invention.

Wherein the figures include the following reference numerals:

10. a polish rod; 20. a base; 21. a base barrier; 22. a third seal member; 23. a third mounting cavity; 24. a blowout prevention ball; 25. A perforated partition plate; 26. a base body; 30. a packing assembly; 31. a stuffing box; 311. a packing cavity bottom barrier; 32. a filler inlet; 33. a blocking member; 34. a flange structure; 40. a gland assembly; 41. a second gland; 411. a handle; 412. an isolating ring; 413. a first mounting cavity; 414. a sleeve; 42. pushing the piece; 421. a baffle ring; 422. a boss; 43. an elastic member; 44. A first gland; 441. a groove; 442. a vent hole; 45. an oil and gas collection structure; 451. a gas collection cavity; 452. an air guide duct; 50. a filler; 60. a third gland; 61. an operation section; 70. a second seal.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless otherwise specified, the use of directional words such as "upper and lower" is generally in reference to the orientation shown in the drawings, or to the vertical, perpendicular or gravitational orientation; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself, but the above directional terms are not intended to limit the present invention.

In order to solve the problems that the filler of the polish rod sealing device in the prior art is difficult to replace and the labor intensity of workers is increased, the polish rod sealing device for the pumping well is provided.

As shown in fig. 1, the pumping well polish rod sealing apparatus includes a polish rod 10, a base 20, a packing assembly 30, and a gland assembly 40. Wherein, the polished rod 10 is arranged in the base 20 in a penetrating way. The packing component 30 is connected with the base 20 and is located above the base 20, the packing component 30 comprises a packing box 31 and a blocking piece 33, the packing box 31 is provided with a packing containing cavity and a packing injection port 32 communicated with the packing containing cavity, the blocking piece 33 can block the packing injection port 32, and the polish rod 10 penetrates through the packing containing cavity. The gland assembly 40 is connected with the packing assembly 30 and is positioned above the packing assembly 30, and the polish rod 10 is arranged in the gland assembly 40 in a penetrating way.

Use the technical scheme of this embodiment, the pumping well polished rod sealing device in this embodiment uses granular packing to seal the pumping well wellhead, filler 50 pours into to the filler through filler filling opening 32 and holds the intracavity, when filler in the pumping well polished rod sealing device has disappearance or defect, the staff takes off shutoff piece 33, pour into filler 50 into to the filler and hold the intracavity through annotating the material rifle, accomplish after filling and pour into again with shutoff piece 33 shutoff filler filling opening 32 can, and then make the staff easier to the operation of filler, simple and convenient, it is comparatively difficult to have solved the filler change of polished rod sealing device among the prior art, the problem of staff intensity of labour has been increased, it is consuming to have shortened the filler change or supplemented, staff's intensity of labour has been reduced.

As shown in fig. 1, the blocking piece 33 extends into the filler neck 32 and is screwed to the filler neck 32. Specifically, the plugging piece 33 is a screwed plug, and the thread section of the screwed plug extends into the filler injection port 32 and is in threaded connection with the filler injection port 32, so that the screwed plug and the filler box 31 are easier and simpler to disassemble and assemble, and the disassembling and assembling difficulty and time consumption are reduced. Meanwhile, the structure is simple, the machining and the implementation are easy, and the machining cost of the polished rod sealing device of the pumping well is reduced.

Optionally, the packing assembly 30 further comprises a first seal. Wherein a first sealing member is provided between the block piece 33 and the filler injection opening 32 to seal the connection of the block piece 33 and the filler injection opening 32. Thus, the arrangement improves the connection sealing performance between the blocking piece 33 and the filler injection port 32, and avoids the filler 50 from leaking from the connection part of the blocking piece and the filler injection port to influence the filler sealing performance.

Optionally, the first seal is a rubber ring.

As shown in FIG. 1, the packing assembly 30 further includes a packing chamber bottom barrier 311. Wherein, the packing chamber bottom partition 311 is positioned in the packing box 31 to support the packing 50 and prevent the packing 50 from entering the base 20.

As shown in fig. 1, the gland assembly 40 includes a first gland 44, a second gland 41, and an elastic member 43. The second gland 41 is connected to the first gland 44, the second gland 41 is connected to the stuffing box 31, and the second gland 41 has a first mounting cavity 413. The elastic member 43 is located in the first mounting chamber 413, a first end of the elastic member 43 contacts the first pressing cover 44, and a second end of the elastic member 43 provides an elastic force to the packing 50 located in the packing receiving chamber to move toward the side of the base 20. Like this, elastic component 43 can compress tightly the filler 50 that is located the filler and holds the intracavity, and then guarantees that filler 50 is to the sealing reliability of pumping well wellhead, and then has promoted pumping well polished rod sealing device's sealing reliability.

Specifically, the second gland 41 is connected with the stuffing box 31, and the first gland 44 can move relative to the second gland 41, so that the first gland 44 can press the elastic piece 43 and the stuffing 50 by operating the first gland 44, and the sealing reliability of the stuffing 50 on the wellhead of the pumping well is further ensured. Meanwhile, the structure is simple, the processing and the realization are easy, and the processing cost of the gland assembly 40 is reduced.

As shown in fig. 1, the first gland 44 is screw-coupled with the second gland 41 such that the elastic member 43 compresses the packing 50 located in the packing receiving cavity by rotating the first gland 44 in a preset direction such that the first gland 44 pushes the elastic member 43. Thus, the arrangement makes the dismounting and the replacement of the first gland 44, the second gland 41 and the elastic piece 43 easier and more convenient, and reduces the operation difficulty of workers.

Specifically, an end of the first pressing cover 44 facing the base 20 is connected to the stuffing box 31, and an end of the first pressing cover 44 away from the base 20 is screwed to the second pressing cover 41, so that the second pressing cover 41 pushes the elastic member 43 to press the stuffing 50 by screwing the second pressing cover 41 into the first pressing cover 44. So that the packing 50 is replenished by unscrewing the second gland 41 from the first gland 44 so that the elastic member 43 no longer compresses the packing 50.

In this embodiment, the first gland 44 has a vent 442 in communication with the first mounting chamber 413, and the pumping well polish rod sealing apparatus further includes a sensing structure. Wherein, the oil gas of detection structure to vent 442 department detects to transmit the detected value to control module, when the detected value is greater than or equal to the default, control module control beam-pumping unit and polished rod 10 stop the motion. Like this, in the process that pumping well polished rod sealing device sealed the pumping well wellhead, if the detected value that detects the structure is greater than or equal to the default, then oil gas leakage takes place for pumping well polished rod sealing device department to shut down the operation, and then guarantee the safety in production.

Specifically, if the detection value of the detection structure is greater than or equal to a preset value, the case where the filler 50 is not compacted or broken is not excluded. At this time, the second gland 41 and the first gland 44 are directly screwed to compact the packing 50. Or the pumping unit is stopped, the staff removes the plugging piece 33, the filler 50 is injected into the filler containing cavity through the material injection gun, and the plugging piece 33 is plugged into the filler injection port 32 after the filler injection is finished, so that the filler 50 is replenished. And then, carrying out starting operation.

In this embodiment, when the detection value is greater than or equal to the preset value, the pumping unit can also give an alarm to remind the staff.

As shown in fig. 1, the gland assembly 40 also includes an oil and gas collection structure 45. The oil and gas collecting structure 45 comprises a gas collecting cavity 451 and a gas guide pipe 452, one end of the gas guide pipe 452 is communicated with the vent hole 442, the other end of the gas guide pipe 452 is communicated with the gas collecting cavity 451, so that oil and gas in the vent hole 442 are guided into the gas collecting cavity 451 through the gas guide pipe 452, and the detection structure is communicated with an exhaust port of the gas collecting cavity 451. Thus, the detection structure detects the natural gas discharged from the exhaust port of the gas collection cavity 451, and after a certain amount of natural gas is collected in the gas collection cavity 451, the control module controls the oil pumping unit and the polished rod 10 to stop moving and alarms in real time to notify field workers.

Specifically, the oil gas collection structure 45 is in threaded connection with the first gland 44, the gas guide pipe 452 is in butt joint with the vent hole 442 and is used for guiding oil gas discharged from the vent hole 442 and guiding natural gas into the gas collection cavity 451, and the oil gas in the gas collection cavity 451 is detected by the detection structure.

As shown in fig. 1, the second gland 41 includes a sleeve 414, a handle 411, and a spacer ring 412. Wherein, one end of the sleeve 414 is in threaded connection with the first gland 44, and the other end of the sleeve 414 is in threaded connection with the stuffing box 31. The handle 411 is disposed outside the sleeve 414 and extends in a radial direction of the sleeve 414. The spacer ring 412 is disposed within the sleeve 414 and coupled to the sleeve 414, the elastic member 43 may pass through the spacer ring 412, and the gland assembly 40 further includes an ejector 42. The second end of the elastic element 43 contacts the first end of the pushing element 42, the spacer ring 412 can be stopped by the first end of the pushing element 42, and the second end of the pushing element 42 has an arc-shaped surface to compress the filler 50 in the filler containing cavity through the arc-shaped surface. In this way, the elastic member 43 compresses the packing 50 through the pushing member 42 to ensure the compression reliability of the packing 50 by the elastic member 43, so that the packing 50 can be compressed. Meanwhile, the structure is simple, the machining and the implementation are easy, and the machining cost of the polished rod sealing device of the pumping well is reduced.

Specifically, one end of the sleeve 414 is screwed with the first gland 44, and the other end of the sleeve 414 is screwed with the stuffing box 31. The worker adjusts the relative position between the sleeve 414 and the stuffing box 31 by rotating the handle 411. The worker compresses the elastic member 43 by screwing the first gland 44 into the sleeve 414, and the elastic member 43 applies an elastic force to the pushing member 42 to move the pushing member 42 toward the packing 50 and to press the packing 50. The spacer ring 412 limits the pushing element 42 to prevent the pushing element 42 from pushing the elastic element 43, which results in the elastic element 43 being compressed and affecting the service life of the elastic element 43. Wherein, the arcwall face of top ejector 42 contacts with packing 50, and then has increased the area of contact of the two, has increased the jacking force of top ejector 42 to packing 50, guarantees that packing 50 can be compressed tightly.

As shown in fig. 1, the base of the first gland 44 has a groove 441. The ejector 42 includes a barrier ring 421 and a boss 422. The retainer ring 421 and the isolation ring 412 limit the stop to prevent the pushing member 42 from passing through the isolation ring 412. Resilient member 43 is a spring that nests between boss 422 and recess 441 to prevent the spring from biasing against friction with polished rod 10.

As shown in fig. 1, the stuffing assembly 30 further includes a flange structure 34 connected to the stuffing box 31, and the pumping well polish rod sealing apparatus further includes a third gland 60 and a second seal 70. Wherein, the third gland 60 has a second mounting cavity, the base 20 is in threaded connection with the cavity wall of the second mounting cavity, and the flange structure 34 is located in the second mounting cavity, so that the flange structure 34 and the base 20 are pressed together by rotating the third gland 60. A second seal 70 is disposed between the flange structure 34 and the base 20. Thus, the above arrangement improves the sealing performance of the connection between the packing assembly 30 and the base 20, and further improves the sealing performance of the whole structure of the polish rod sealing device of the pumping well.

Specifically, the base 20 is threadedly coupled to the third gland 60 and extends into the second mounting cavity, and the flange structure 34 is located between and compressed by the base 20 and the third gland 60, thereby tightly coupling the packing assembly 30 to the base 20. Wherein the above arrangement of the second sealing member 70 can improve the sealing performance of the joint of the packing assembly 30 and the base 20.

In the present embodiment, the third cover 60 is provided with an operation portion 61. The staff adjusts the relative position between the third gland 60 and the base 20 by rotating the operation part 61, so that the staff can operate the third gland 60 more easily and conveniently, and the operation difficulty is reduced.

As shown in fig. 1, the base 20 includes a base body 26 and a blowout preventer ball 24. Wherein, the base body 26 has a third installation cavity 23 and a via hole communicated with the third installation cavity 23, and the via hole is used for the light feed rod 10 to pass through. And a blowout prevention ball 24 is arranged in the third mounting cavity 23, and when the polished rod 10 is pulled out of the through hole, the blowout prevention ball moves towards the through hole under the action of pressure and buoyancy of gas and liquid in the oil well so as to block the through hole. Thus, when the polished rod 10 falls off, the blowout prevention ball 24 can block the via hole, and gas and liquid are prevented from being ejected out of a wellhead through the via hole.

As shown in FIG. 1, the base 20 further includes a base rail 21, a third seal 22, and a perforated partition 25. The base partition 21 is made of copper, the third sealing element 22 is made of a non-metal material, the third sealing element 22 and the base partition 21 are embedded into a middle through hole of the base body 26, the upper portion of the base body 26 is in threaded connection with the third gland 60 through external threads, the top of the inner cavity is arc-shaped, the bottom of the inner cavity and the partition 25 with the hole form a third mounting cavity 23, and the blowout prevention ball 24 is located in the third mounting cavity 23. The blowout prevention ball 24 is a corrosion-resistant non-metallic hollow sphere. The lower portion of the base body 26 is base pipe threads and is in threaded connection with a wellhead valve.

Specifically, at the moment that the polish rod 10 is broken and falls into the pumping well, gas and liquid in the pumping well gushes into the third mounting cavity 23 through a pore passage on the partition plate 25 with the hole, and the blowout prevention ball 24 blocks the through hole under the jacking action of gas-liquid pressure and buoyancy, so that the blowout prevention function is realized, and environmental pollution caused by leakage of a large amount of oil gas is avoided.

Specifically, the working principle of the pumping well polish rod sealing device is as follows:

install pumping well polished rod sealing device on the rubber gate of pumping well head, close the rubber gate when filling filler 50, adjust the elasticity of first gland 44 and second gland 41, after the residual pressure of unloading, lift off shutoff piece 33, fill up after granular filler 50 with the notes material rifle, it holds the chamber to pour into the filler into granular filler 50 into by the pressurization of notes material rifle, unload the material rifle, it is suitable to go up shutoff piece 33, the adjustment is suitable to the elasticity of first gland 44 and second gland 41 after accomplishing filling of filler 50, and then realized need not draw and get old and useless packing, and convenient operation has avoided the extravagant and environmental pollution of raw and other materials.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

the pumping well polished rod sealing device in this application uses graininess filler to seal pumping well wellhead, it holds the intracavity to pack to fill through the filler filling opening injection, when the filler in the pumping well polished rod sealing device has disappearance or defective, the staff takes off the shutoff piece, fill into to fill through annotating the material rifle and hold the intracavity, accomplish fill after injection into with the shutoff piece shutoff fill can, and then make the staff easier to the operation of filler, simple and convenient, the filler change of having solved prior art polished rod sealing device is comparatively difficult, staff intensity of labour's problem has been increased, it is consuming time to have shortened the filler change or have supplemented, staff's intensity of labour has been reduced.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (8)

1. A pumping well polish rod sealing device, comprising:

a polish rod (10);

the polish rod (10) penetrates through the base (20);

the packing assembly (30) is connected with the base (20) and positioned above the base (20), the packing assembly (30) comprises a packing box (31) and a blocking piece (33), the packing box (31) is provided with a packing containing cavity and a packing injection port (32) communicated with the packing containing cavity, the blocking piece (33) can block the packing injection port (32), and the polish rod (10) is arranged in the packing containing cavity in a penetrating mode;

the gland assembly (40) is connected with the packing assembly (30) and is positioned above the packing assembly (30), and the polish rod (10) is arranged in the gland assembly (40) in a penetrating way;

the gland assembly (40) comprises a first gland (44), a second gland (41) and an elastic piece (43), wherein the second gland (41) is provided with a first mounting cavity (413), and the first gland (44) is provided with a vent hole (442) communicated with the first mounting cavity (413); the gland assembly (40) further comprises:

the oil gas collecting structure (45) comprises a gas collecting cavity (451) and a gas guide pipeline (452), one end of the gas guide pipeline (452) is communicated with the vent hole (442), and the other end of the gas guide pipeline (452) is communicated with the gas collecting cavity (451) so as to guide natural gas in the vent hole (442) to the gas collecting cavity (451) through the gas guide pipeline (452);

the pumping well polish rod sealing device further comprises:

the detection structure detects oil gas at the vent hole (442) to transmit a detection value to the control module, and when the detection value is larger than or equal to a preset value, the control module controls the oil pumping unit and the polish rod (10) to stop moving; the detection structure is communicated with an exhaust port of the gas collection cavity (451).

2. The polish rod sealing device for a pumping well according to claim 1, wherein the block piece (33) protrudes into the packing injection port (32) and is screwed to the packing injection port (32).

3. The pumping well polish rod sealing device of claim 1, wherein said packing assembly (30) further comprises:

a first sealing element arranged between the closure (33) and the filler neck (32) for sealing the connection of the closure (33) and the filler neck (32).

4. The polish rod sealing device for a pumping well according to claim 1, wherein a second gland (41) is connected with the first gland (44), the second gland (41) being connected with the stuffing box (31); an elastic member (43) is located in the first mounting chamber (413), a first end of the elastic member (43) is in contact with the first pressing cover (44), and a second end of the elastic member (43) provides an elastic force for the packing (50) located in the packing accommodating chamber to move toward one side of the base (20).

5. The polish rod sealing apparatus for a pumping well according to claim 4, wherein the first gland (44) is screw-coupled with the second gland (41) such that the first gland (44) pushes the elastic member (43) by rotating the first gland (44) in a preset direction, the elastic member (43) pressing the packing (50) located in the packing receiving chamber.

6. The polish rod sealing device for a pumping well according to claim 4, wherein the second gland (41) comprises:

a sleeve (414), one end of the sleeve (414) is in threaded connection with the first gland (44), and the other end of the sleeve (414) is in threaded connection with the stuffing box (31);

a handle (411) disposed outside the sleeve (414) and extending in a radial direction of the sleeve (414);

a spacer ring (412) disposed within the sleeve (414) and coupled to the sleeve (414), the resilient member (43) being insertable through the spacer ring (412), the gland assembly (40) further comprising:

the second end of the elastic piece (43) is in contact with the first end of the pushing piece (42), the isolating ring (412) can limit and stop the first end of the pushing piece (42), and the second end of the pushing piece (42) is provided with an arc-shaped surface so as to compress the filler (50) in the filler containing cavity through the arc-shaped surface.

7. The pumping well polish rod sealing device of claim 1, wherein said stuffing assembly (30) further comprises a flange structure (34) connected to said stuffing box (31), said pumping well polish rod sealing device further comprising:

a third gland (60), wherein the third gland (60) is provided with a second mounting cavity, the base (20) is in threaded connection with the wall of the second mounting cavity, and the flange structure (34) is located in the second mounting cavity so that the flange structure (34) and the base (20) are pressed together by rotating the third gland (60);

a second seal (70) disposed between the flange structure (34) and the base (20).

8. The polish rod sealing device for a pumping well according to claim 1, wherein the base (20) comprises:

a base body (26) having a third mounting cavity (23) and a via hole communicating with the third mounting cavity (23), the via hole being for the polish rod (10) to pass through;

and the blowout prevention ball (24) is arranged in the third mounting cavity (23), and when the polished rod (10) is pulled out of the through hole, the blowout prevention ball (24) moves towards the through hole under the action of pressure and buoyancy of gas and liquid in the oil well so as to plug the through hole.

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