Oil well polished rod sealing system

Abstract

The present invention provides a pumping well polished rod sealing system. The pumping well polished rod sealing system comprises a base, a stuffing sleeve and a gland assembly which are sequentially sleeved on the polished rod along the axial direction of the polished rod, wherein the stuffing sleeve is located at the end of the base away from the wellhead, wherein an accommodating recess is provided on the inner wall of the stuffing sleeve facing the polished rod to form a stuffing cavity, and the pumping well polished rod sealing system further comprises: a sealing stuffing, which is filled in the stuffing cavity so that the sealing stuffing is wrapped around the polished rod to prevent the oil in the wellhead from escaping through the gap between the polished rod and the base, and the gland assembly can compress the sealing stuffing. The present invention effectively solves the problem that the sealing device in the pumping well polished rod sealing system in the prior art is prone to failure.

Description

Technical Field

[0001] The invention relates to the field of oil well equipment for petroleum production, and in particular to a polished rod sealing system for an oil well. Background Art

[0002] At the oil extraction site, the pumping rod of the pumping well connects the pumping unit rope hanger and the downhole pumping rod column to drive the pumping pump to work reciprocatingly. The wellhead and the rod are sealed by a packing box. At present, the sealing packing used for the wellhead seal of the pumping well is mostly annular rubber packing or rubber belt packing. When replacing the packing, the old packing must be cleaned out, which requires a high degree of centering of the rod and is laborious to operate. Waste and old packing will also cause a waste of raw materials and environmental pollution to a certain extent. Depending on the well conditions, the packing must be tightened manually at regular intervals, otherwise it will cause oil and gas leakage from the wellhead. Occasionally, the rod breaks and falls into the wellbore at the oil field production site, and the seal of the wellhead packing box fails, causing a large amount of oil and gas leakage and environmental pollution accidents.

[0003] As can be seen from the above, in the prior art, there is a problem that the sealing device in the polished rod sealing system of the pumping well is prone to failure. Summary of the invention

[0004] The main purpose of the present invention is to provide a pumping well polished rod sealing system to solve the problem that the sealing device in the pumping well polished rod sealing system in the prior art is prone to failure.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a pumping well bare rod sealing system is provided, comprising a base, a stuffing sleeve and a gland assembly which are sequentially sleeved on the bare rod along the axial direction of the bare rod, wherein the stuffing sleeve is located at the end of the base away from the wellhead, wherein an accommodating recess is provided on the inner wall of the stuffing sleeve facing the bare rod to form a stuffing cavity, and the stuffing sleeve has an opening in a direction perpendicular to the axis of the bare rod, and a sealing stuffing is added to the inside of the stuffing cavity through the opening, and a stuffing plug is provided at the opening to seal the opening. The pumping well bare rod sealing system also includes: a sealing stuffing, which is filled in the stuffing cavity so that the sealing stuffing is wrapped around the bare rod to prevent the oil in the wellhead from rushing up through the gap between the bare rod and the base, and the gland assembly can compress the sealing stuffing.

[0006] Furthermore, the gland assembly includes: a main gland, which is connected to the stuffing sleeve and compresses the sealing stuffing; an auxiliary gland, which is located at one end of the main gland away from the stuffing sleeve and is connected to the bare rod and / or the main gland; and a spring, which abuts between the main gland and the auxiliary gland.

[0007] Furthermore, the main gland includes: a gland body, a first end of the gland body being threadedly connected to the stuffing sleeve, and / or a second end of the gland body being threadedly connected to the auxiliary gland; a fence structure, the fence structure being located between the light rod and the gland body, and a first end of the fence structure compresses the sealing stuffing, a second end of the fence structure supports a spring, and the fence structure can move axially along the light rod relative to the gland body and / or the auxiliary gland.

[0008] Furthermore, the barrier structure comprises: a gland barrier, which compresses the sealing filler; and a spring barrier, which supports the spring and compresses the gland barrier under the action of the spring.

[0009] Furthermore, an arc-shaped pressing surface is provided at one end of the gland barrier facing the sealing filler.

[0010] Furthermore, a first stop ridge is provided at one end of the gland barrier close to the spring barrier, and a second stop ridge matching with the first stop ridge is provided on the surface of the gland body facing the light rod, and the first stop ridge is provided close to the auxiliary gland relative to the second stop ridge.

[0011] Furthermore, a filler cavity bottom fence is arranged in one end of the filler cavity close to the base to prevent the sealing filler from overflowing.

[0012] Furthermore, the oil pumping well polished rod sealing system also includes a biasing pressure adjusting member, which is arranged between the base and the stuffing sleeve to adjust the bias of the polished rod.

[0013] Furthermore, the bias-adjusting pressure member comprises: a bias-adjusting flange, which is arranged at one end of the packing sleeve close to the base; and a bias-adjusting pressure cover, which presses the bias-adjusting flange onto the base.

[0014] Furthermore, an annular receiving portion is provided at one end of the base close to the deviation adjusting flange, a base fence is provided in the annular receiving portion, the base fence is located between the base and the bare rod, and the deviation adjusting flange presses the base tightly through the base fence.

[0015] Furthermore, an annular groove is arranged at one end of the deflection adjusting flange close to the base, a rubber pad is arranged inside the annular groove, and the deflection adjusting flange is pressed against the base through the rubber pad.

[0016] Furthermore, a blowout prevention chamber is arranged inside the base, at least one blowout prevention ball is arranged inside the blowout prevention chamber, and the polished rod passes through the blowout prevention chamber.

[0017] Furthermore, the pumping well polished rod sealing system also includes an injection gun, and the sealing filler is injected into the filler cavity through the injection gun.

[0018] Furthermore, the injection gun includes: a filling tube, a piston is arranged inside the filling tube; an end cover, both ends of the filling tube are sealed by the end cover; a top screw, one end of the top screw is fixed on the piston, and the other end of the top screw passes through the through hole on the end cover and extends out of the filling tube.

[0019] Applying the technical solution of the present invention, the pumping well polished rod sealing system in the present application includes a base, a stuffing sleeve and a gland assembly which are sequentially sleeved on the polished rod along the axial direction of the polished rod, wherein the stuffing sleeve is located at the end of the base away from the wellhead, wherein an accommodating recess is provided on the inner wall of the stuffing sleeve facing the polished rod to form a stuffing cavity, and the stuffing sleeve has an opening in a direction perpendicular to the axis of the polished rod, through which a sealing stuffing is added to the inside of the stuffing cavity, and a stuffing plug is provided at the opening to seal the opening. The pumping well polished rod sealing system also includes a sealing stuffing, which is filled in the stuffing cavity so that the sealing stuffing covers the surface of the polished rod to prevent the oil in the wellhead from rushing up through the gap between the polished rod and the base, and the gland assembly can compress the sealing stuffing.

[0020] When using the oil pumping well bare rod sealing system of the above structure, by setting a gland assembly, after the sealing packing is filled in the packing cavity of the packing sleeve, the sealing packing can be compressed by the gland assembly, thereby sealing the bare rod and the oil pumping well to prevent oil from leaking out between the oil pumping well and the bare rod. This effectively replaces the sealing method of using a packing box seal and reduces the workload of the operator. By setting an opening, the sealing packing can be filled into the packing cavity or taken out of the packing cavity through the opening, thereby facilitating the workers to replace the sealing packing. After the sealing packing is filled into the packing cavity, the opening can be sealed with a packing plug. And by using the gland assembly to compress the sealing packing, there is no need to repeatedly compress the sealing packing. At the same time, the phenomenon of bare rod breakage is also reduced. This effectively solves the problem of sealing device failure in the oil pumping well bare rod sealing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic structural diagram of a polished rod sealing system for an oil well according to a specific embodiment of the present invention is shown; and

[0023] Figure 2 Shows Figure 1 Schematic diagram of the structure of the injection gun in the bare rod sealing system of the oil pumping well.

[0024] The above drawings include the following reference numerals:

[0025] 10. Bare rod; 20. Base; 21. Base fence; 22. Blowout prevention chamber; 23. Blowout prevention ball; 30. Stuffing sleeve; 31. Stuffing chamber; 311. Stuffing chamber bottom fence; 32. Opening; 33. Stuffing plug; 40. Gland assembly; 41. Main gland; 411. Gland body; 412. Fence structure; 4121. Gland fence; 4122. Spring fence; 4123. First stop convex edge; 4124. Second stop convex edge; 42. Auxiliary gland; 43. Spring; 50. Sealing packing; 60. Adjusting bias pressure piece; 61. Adjusting bias flange; 611. Rubber pad; 62. Adjusting bias gland; 70. Injection gun; 71. Stuffing tube; 711. Piston; 72. End cover; 73. Top screw; 80. Perforated partition. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0029] In order to solve the problem that the sealing device in the polished rod sealing system of an oil pumping well in the prior art is prone to failure, the present application provides a polished rod sealing system for an oil pumping well.

[0030] like Figure 1 As shown, the pumping well polished rod sealing system in the present application includes a base 20, a stuffing sleeve 30 and a gland assembly 40 which are sequentially sleeved on the polished rod 10 along the axial direction of the polished rod 10, wherein the stuffing sleeve 30 is located at the end of the base 20 away from the wellhead, wherein an accommodating recess is provided on the inner wall of the stuffing sleeve 30 facing the polished rod 10 to form a stuffing cavity 31, and the stuffing sleeve 30 has an opening 32 in a direction perpendicular to the axis of the polished rod 10, and a sealing stuffing 50 is added to the inside of the stuffing cavity 31 through the opening 32, and a stuffing plug 33 is provided at the opening 32 to seal the opening 32. The pumping well polished rod sealing system also includes a sealing stuffing 50, which is filled in the stuffing cavity 31 so that the sealing stuffing 50 is wrapped around the polished rod 10 to prevent the oil in the wellhead from rushing up through the gap between the polished rod 10 and the base 20, and the gland assembly 40 can compress the sealing stuffing 50.

[0031] When using the oil pumping well polished rod sealing system of the above structure, by setting the gland assembly 40, after the sealing packing 50 is filled in the packing cavity 31 of the packing sleeve 30, the sealing packing 50 can be compressed by the gland assembly 40, thereby sealing the polished rod 10 and the oil pumping well to prevent oil from leaking out between the oil pumping well and the polished rod 10. Thus, the sealing method of using the packing box seal is effectively replaced, and the workload of the operator is reduced. By setting the opening 32, the sealing packing 50 can be filled into the packing cavity 31 through the opening 32 or the sealing packing 50 can be taken out of the packing cavity 31, so that it is convenient for workers to replace the sealing packing 50. After the sealing packing 50 is filled into the packing cavity 31, the packing plug 33 can be used to seal the opening 32. And by using the gland assembly 40 to compress the sealing packing 50, there is no need to repeatedly compress the sealing packing 50. Thus, the problem of failure of the sealing device in the oil pumping well polished rod sealing system is effectively solved.

[0032] like Figure 1 As shown, the gland assembly 40 includes a main gland 41, a secondary gland 42 and a spring 43. The main gland 41 is connected to the stuffing sleeve 30 and compresses the sealing packing 50; the secondary gland 42 is located at one end of the main gland 41 away from the stuffing sleeve 30, and the secondary gland 42 is connected to the light rod 10 and / or the main gland 41; the spring 43 abuts between the main gland 41 and the secondary gland 42. By such an arrangement, the gland assembly 40 can effectively compress the sealing packing 50, and by arranging the spring 43, the spring 43 can continuously compress the main gland 41, thereby ensuring that the main gland 41 can continuously compress the sealing packing 50, thereby avoiding the operator from repeatedly adjusting the gland assembly 40.

[0033] Specifically, the main gland 41 includes a gland body 411 and a fence structure 412. The first end of the gland body 411 is threadedly connected to the stuffing sleeve 30, and / or the second end of the gland body 411 is threadedly connected to the auxiliary gland 42; the fence structure 412 is located between the light rod 10 and the gland body 411, and the first end of the fence structure 412 compresses the sealing packing 50, the second end of the fence structure 412 supports the spring 43, and the fence structure 412 can move along the axial direction of the light rod 10 relative to the gland body 411 and / or the auxiliary gland 42. By providing the fence structure 412, the spring 43 can be prevented from directly contacting the sealing packing 50 during the process of compressing the sealing assembly, thereby preventing the spring 43 from being deflected, thereby ensuring the compression effect of the gland assembly 40 on the sealing packing 50. Furthermore, since the fence structure 412 can move along the axial direction of the polished rod 10 with respect to the gland body 411 and / or the auxiliary gland 42 , the compression degree of the sealing packing 50 can be flexibly adjusted through the fence structure 412 .

[0034] When the secondary pressure cover 42 is connected to the main pressure cover 41, the secondary pressure cover 42 and the main pressure cover 41 are fixed by threads, and the secondary pressure cover 42 adjusts the compression amount of the spring 43 by the cooperation of the internal thread and the external thread. Of course, the secondary pressure cover 42 and the main pressure cover 41 can also be connected and fixed by other means.

[0035] Specifically, the upper end of the auxiliary pressure cover 42 is a hexahedron. By such an arrangement, the auxiliary pressure cover 42 can be adjusted more conveniently, thereby ensuring that the compression amount of the spring 43 can be adjusted more easily through the auxiliary pressure cover 42.

[0036] Specifically, the fence structure 412 includes a gland fence 4121 and a spring fence 4122. The gland fence 4121 compresses the sealing packing 50; the spring fence 4122 supports the spring 43 and compresses the gland fence 4121 under the action of the spring 43. In a specific embodiment, the spring fence 4122 is "U" shaped, and the bottom surface is a plane, and the gland fence 4121 is a copper "T" shape, the upper end surface is a plane, and is pressed by the bottom plane of the spring fence 4122, and the spring fence 4122 is compressed by the spring 43.

[0037] Optionally, an arc-shaped pressing surface is provided at one end of the gland barrier 4121 facing the sealing packing 50. By providing the arc-shaped pressing surface, the contact area between the gland barrier 4121 and the sealing packing 50 can be increased, so that the gland barrier 4121 can more stably press the sealing packing 50. And by such a configuration, in the process of the gland barrier 4121 pressing the sealing packing 50, the sealing packing 50 can be prevented from spreading and leaking outward, so as to ensure the sealing performance of the sealing packing 50.

[0038] Specifically, a first stop ridge 4123 is provided at one end of the gland fence 4121 close to the spring fence 4122, and a second stop ridge 4124 matching the first stop ridge 4123 is provided on the surface of the gland body 411 facing the polished rod 10, and the first stop ridge 4123 is provided close to the auxiliary gland 42 relative to the second stop ridge 4124. By providing the first stop ridge and the second stop ridge, the moving distance of the gland fence 4121 can be limited, so as to prevent the gland assembly 40 from excessively squeezing the sealing packing 50, thereby affecting the strength of the entire pumping well polished rod sealing system.

[0039] Specifically, a filler cavity bottom fence 311 is provided in one end of the filler cavity 31 close to the base 20 to prevent the sealing filler 50 from overflowing. This arrangement can not only prevent the sealing filler 50 from overflowing from the bottom of the filler cavity 31, but also provide support for the sealing filler 50 when the sealing filler 50 is squeezed.

[0040] In a specific embodiment, the filler chamber bottom fence 311 is a copper ring.

[0041] like Figure 1 As shown, the pumping well polished rod sealing system further includes a bias adjustment pressure member 60, which is disposed between the base 20 and the stuffing sleeve 30 to adjust the bias of the polished rod 10. By arranging the bias adjustment pressure member 60 to adjust the bias of the polished rod 10, the centering of the polished rod 10 can be checked by bias adjustment pressure after the pumping well polished rod sealing system is assembled, thereby ensuring the centering requirement of the polished rod 10 during installation and operation.

[0042] Specifically, the bias adjustment pressure member 60 includes a bias adjustment flange 61 and a bias adjustment pressure cover 62. The bias adjustment flange 61 is arranged at one end of the packing sleeve 30 close to the base 20; the bias adjustment pressure cover 62 presses the bias adjustment flange 61 onto the base 20. In a specific embodiment, a handle extending outward is arranged in the middle of the bias adjustment pressure cover 62, and when the polished rod 10 needs to be adjusted and centered, the operator can adjust and centered the polished rod 10 by controlling the handle of the bias adjustment pressure cover 62. By controlling the handle, the positions of the packing sleeve 30 and the bias adjustment flange 61 on the base 20 can be finely adjusted in the front, back, left, and right directions.

[0043] Optionally, the stuffing sleeve 30 and the deviation adjustment flange 61 can be welded into an integral structure.

[0044] Optionally, the biasing pressure adjusting cover 62 and the base 20 may be fixed by a threaded connection.

[0045] Specifically, an annular receiving portion is provided at one end of the base 20 close to the deflection adjusting flange 61, a base fence 21 is provided in the annular receiving portion, the base fence 21 is located between the base 20 and the polished rod 10, and the deflection adjusting flange 61 presses the base 20 through the base fence 21. By such a configuration, it can be ensured that the force on the base 20 is more uniform, and the deflection adjusting pressure member 60 can control the polished rod 10 more sensitively.

[0046] Specifically, an annular groove is provided at one end of the deflection adjusting flange 61 close to the base 20, and a rubber pad 611 is provided inside the annular groove, and the deflection adjusting flange 61 presses the base 20 through the rubber pad 611. By this arrangement, the end surface of the deflection adjusting flange 61 and the base 20 in contact can be sealed by pressing the rubber pad 611.

[0047] like Figure 1As shown, a blowout prevention chamber 22 is provided inside the base 20, at least one blowout prevention ball 23 is provided inside the blowout prevention chamber 22, and the polished rod 10 passes through the blowout prevention chamber 22. When the polished rod 10 breaks and falls into the wellbore, the fluid in the wellbore enters the blowout prevention chamber 22 through the hole on the perforated partition plate 80, and the blowout prevention ball 23 blocks the through hole inside the base 20 due to the breakage of the polished rod 10 under the supporting action of the fluid pressure and buoyancy, thereby realizing the blowout prevention function, thereby avoiding the occurrence of environmental pollution accidents caused by a large amount of oil and gas leakage.

[0048] Optionally, the anti-blowout ball 23 is a corrosion-resistant non-metallic hollow body.

[0049] like Figure 2 As shown, the pumping well polished rod sealing system further comprises an injection gun 70 , through which the sealing filler 50 is injected into the filler cavity 31 .

[0050] like Figure 2 As shown, the injection gun 70 includes a stuffing tube 71, an end cover 72 and a top screw 73. A piston 711 is arranged inside the stuffing tube 71; both ends of the stuffing tube 71 are sealed by the end cover 72; one end of the top screw 73 is fixed on the piston 711, and the other end of the top screw 73 passes through the through hole on the end cover 72 and extends out of the stuffing tube 71. Optionally, the lower part of the base 20 is a base 20 pipe thread and is threadedly connected to the wellhead gate. In addition, the sealing filler 50 is made of granular rubber, graphite powder, and lithium-based grease mixed in proportion, which is oil-resistant, wear-resistant, and high-temperature resistant, with a particle size of 2-6 mm, and is packaged in barrels and cans. The diameter of the barrels and cans is slightly smaller than the diameter of the stuffing tube 71 of the injection gun 70, which is convenient for on-site operation.

[0051] When the entire pumping well bare rod sealing system is used, the pumping well bare rod sealing system is installed on the rubber gate at the wellhead of the pumping well. When filling the sealing packing 50, the rubber gate is closed, and the tightness of the auxiliary pressure cover 42 and the main pressure cover 41 is adjusted. After the residual pressure is vented, the packing plug 33 is removed. After the injection gun 70 is filled with the sealing packing 50, the sealing packing 50 is pressurized by the injection gun 70 to inject the sealing packing 50 into the packing cavity 31. After the filling is completed, the injection gun 70 is removed, and the packing plug 33 is tightened. Then, the tightness of the main pressure cover 41 and the auxiliary pressure cover 42 is adjusted, thereby completing the entire sealing packing 50 adding process.

[0052] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0053] 1. After using the sealing system in this application, there is no need to remove the waste packing;

[0054] 2. Ensure the centering requirement of the polished rod 10;

[0055] 3. Avoid the waste of raw materials and environmental pollution;

[0056] 4. It has a blowout prevention function to avoid environmental pollution accidents caused by large-scale oil and gas leakage.

[0057] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pumping well polished rod sealing system, characterized in that: The invention comprises a base (20), a stuffing sleeve (30) and a gland assembly (40) which are sequentially sleeved on the polished rod (10) along the axial direction of the polished rod (10), wherein the stuffing sleeve (30) is located at an end of the base (20) away from the wellhead, wherein an accommodating recess is provided on the inner wall of the stuffing sleeve (30) on the side facing the polished rod (10) to form a stuffing cavity (31), and the stuffing sleeve (30) has an opening (32) in a direction perpendicular to the axis of the polished rod (10), and a sealing stuffing (50) is added to the inside of the stuffing cavity (31) through the opening (32), and a stuffing plug (33) is provided at the opening (32) to seal the opening (32), and the pumping well polished rod sealing system also comprises: A sealing filler (50), the sealing filler (50) being filled in the filler cavity (31) so that the sealing filler (50) covers the periphery of the polished rod (10) to prevent oil in the wellhead from flowing upward through the gap between the polished rod (10) and the base (20), and the gland assembly (40) being able to compress the sealing filler (50); The gland assembly (40) comprises: a main gland (41), the main gland (41) being connected to the stuffing sleeve (30) and compressing the sealing stuffing (50); a secondary gland (42), the secondary gland (42) being located at an end of the main gland (41) away from the stuffing sleeve (30), and the secondary gland (42) being connected to the bare rod (10) and / or the main gland (41); and a spring (43), the spring (43) being abutted between the main gland (41) and the secondary gland (42); The main gland (41) comprises: a gland body (411), a first end of the gland body (411) being threadedly connected to the stuffing sleeve (30), and / or a second end of the gland body (411) being threadedly connected to the auxiliary gland (42); a fence structure (412), the fence structure (412) being located between the light rod (10) and the gland body (411), and a first end of the fence structure (412) pressing the sealing stuffing (50), a second end of the fence structure (412) supporting the spring (43), and the fence structure (412) being able to move along the axial direction of the light rod (10) relative to the gland body (411) and / or the auxiliary gland (42); The barrier structure (412) comprises: a gland barrier (4121), the gland barrier (4121) pressing the sealing filler (50); and a spring barrier (4122), the spring barrier (4122) supporting the spring (43) and pressing the gland barrier (4121) under the action of the spring (43); An arc-shaped pressing surface is provided at one end of the gland barrier (4121) facing the sealing filler (50); A first stop ridge (4123) is provided at one end of the gland barrier (4121) close to the spring barrier (4122); a second stop ridge (4124) cooperating with the first stop ridge (4123) is provided on the surface of the gland body (411) facing the light rod (10); the first stop ridge (4123) is provided close to the auxiliary gland (42) relative to the second stop ridge (4124).

2. The oil well polished rod sealing system according to claim 1, characterized in that: A filling cavity bottom fence (311) is provided in one end of the filling cavity (31) close to the base (20) to prevent the sealing filling (50) from overflowing.

3. The oil well polished rod sealing system according to claim 1, characterized in that: The oil pumping well polished rod sealing system further comprises a biasing pressure adjusting member (60), wherein the biasing pressure adjusting member (60) is arranged between the base (20) and the stuffing sleeve (30) to adjust the bias of the polished rod (10).

4. The oil well polished rod sealing system according to claim 3, characterized in that: The biasing pressure adjusting member (60) comprises: An adjustment flange (61), the adjustment flange (61) being arranged at one end of the packing sleeve (30) close to the base (20); A bias adjustment pressure cover (62), wherein the bias adjustment pressure cover (62) presses the bias adjustment flange (61) onto the base (20).

5. The oil well polished rod sealing system according to claim 4, characterized in that: An annular receiving portion is provided at one end of the base (20) close to the deflection adjusting flange (61), a base fence (21) is provided in the annular receiving portion, the base fence (21) is located between the base (20) and the bare rod (10), and the deflection adjusting flange (61) is pressed against the base (20) via the base fence (21).

6. The oil well polished rod sealing system according to claim 5, characterized in that: An annular groove is provided at one end of the deflection adjusting flange (61) close to the base (20), a rubber pad (611) is provided inside the annular groove, and the deflection adjusting flange (61) is pressed against the base (20) via the rubber pad (611).

7. The oil well polished rod sealing system according to any one of claims 1 to 6, characterized in that: A blowout prevention chamber (22) is arranged inside the base (20), at least one blowout prevention ball (23) is arranged inside the blowout prevention chamber (22), and the polished rod (10) passes through the blowout prevention chamber (22).

8. The oil well polished rod sealing system according to any one of claims 1 to 6, characterized in that: The oil pumping well polished rod sealing system further comprises an injection gun (70), and the sealing filler (50) is injected into the filler cavity (31) through the injection gun (70).

9. The oil well polished rod sealing system according to claim 8, characterized in that: The injection gun (70) comprises: A stuffing tube (71), wherein a piston (711) is arranged inside the stuffing tube (71); An end cover (72), both ends of the stuffing tube (71) being sealed by the end cover (72); A jacking screw rod (73), one end of which is fixed to the piston (711), and the other end of which passes through a through hole on the end cover (72) and extends out of the stuffing tube (71).

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