Wellhead polish rod sealing device

Abstract

The invention relates to the technical field of oil extraction wellhead devices in oil fields, in particular to a wellhead polish rod sealing device, and aims to solve the technical problems that in the related technology, the packing replacement process depends on an auxiliary tool, operation is inconvenient, and consumed time is long. The wellhead polish rod sealing device comprises a packing ejection mechanism, the packing ejection mechanism comprises a packing box and a packing ejection rod, the packing ejection rod is arranged on a polish rod in a sleeving mode, and the packing box is arranged on the packing ejection rod in a sleeving mode and is in threaded connection with the packing ejection rod. A containing cavity is defined by the packing box, the packing ejector rod and the polish rod and used for containing packing. The rotation of the packing box around the packing ejector rod is used for changing the length of the containing cavity. According to the wellhead polish rod sealing device, the length-adjustable containing cavity is formed by the packing box and the packing ejector rod which are in threaded connection, the packing is pushed out by the packing ejector rod by shortening the containing cavity, auxiliary tools are not needed, and rapid replacement of the packing is achieved. The packing box solves the technical problems that an existing packing box depends on an auxiliary tool in the packing replacing process, operation is inconvenient, and consumed time is long.

Description

Technical Field

[0001] This invention relates to the field of oilfield wellhead equipment technology, and in particular to a wellhead polished rod sealing device. Background Technology

[0002] In oilfield operations, the pumping unit packing box in the wellhead polished rod sealing device is a key component for ensuring wellhead sealing, playing a crucial role in the high-temperature, high-pressure, and continuous frictional working environment. However, existing packing boxes require auxiliary tools and are time-consuming to replace, often necessitating depressurization and venting, thus increasing the complexity and time cost of the entire operation. This problem is particularly pronounced when removing the packing from the bottom of the packing box.

[0003] Existing packing boxes have technical problems such as the need for auxiliary tools and inconvenient operation during the packing replacement process, resulting in long processing times. Summary of the Invention

[0004] The purpose of this invention is to provide a wellhead polished rod sealing device to solve the technical problem in related technologies that the replacement of packing glands relies on auxiliary tools and is inconvenient to operate, resulting in long processing time.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The wellhead polished rod sealing device provided by this invention includes:

[0007] A packing ejection mechanism includes a packing box and a packing ejector rod. The packing ejector rod is sleeved on a smooth rod, and the packing box is sleeved on the packing ejector rod and threadedly connected to it. The packing box, the packing ejector rod, and the smooth rod form an annular receiving cavity for accommodating the packing. Rotation of the packing box around the packing ejector rod changes the length of the annular receiving cavity.

[0008] Specifically, it also includes a second sealing mechanism, which comprises a sealing box, a sealing top rod, and a rubber core. The sealing top rod is sleeved on the smooth rod, and the sealing box is sleeved on the sealing top rod and threadedly connected to it. The sealing box, the sealing top rod, and the smooth rod form a sealing cavity, in which the rubber core is installed. Rotation of the sealing box around the sealing top rod changes the size of the sealing cavity, causing the rubber core to be compressed and grip the smooth rod.

[0009] Specifically, it also includes a slide adjustment mechanism, which comprises a clamp body, a slide, and slide adjustment screws. The clamp body is sleeved on the guide rod. The slide is mounted on the clamp body and sleeved on the guide rod. The packing top rod is connected to the end of the spacer box away from the spacer top rod, and the spacer top rod is connected to the end of the slide away from the clamp body. A plurality of slide adjustment screws are evenly distributed around the axis of the clamp body and abut against the outer periphery of the slide, used to adjust the radial position of the slide and the guide rod.

[0010] Specifically, the packing ejection mechanism further includes a pressure cap, which is threaded to the end of the packing box away from the packing ejector rod and sleeved on the guide rod, for closing the annular receiving cavity and applying pressure to the packing stacked in the annular receiving cavity so that the packing is tightly attached to the guide rod.

[0011] Specifically, the pressure cap, the packing rod, and the spacer box are all provided with wear-resistant bushings on the contact surfaces with the light rod.

[0012] Specifically, the packing ejection mechanism also includes a packing box ejector screw, and the packing box is fixed to the packing ejector rod by the packing box ejector screw.

[0013] Specifically, the second sealing mechanism also includes a sealing box top screw, and the sealing box is fixed to the sealing top rod by the sealing box top screw.

[0014] Specifically, the slide adjustment mechanism further includes a plug and plug set screws. The plug is threadedly connected to the clamp body and abuts against the slide; the rotation of the plug around the clamp body applies a thrust to the slide so that the slide abuts against the clamp body; a plurality of plug set screws are evenly distributed around the axis of the clamp body and abut against the outer periphery of the plug respectively.

[0015] Specifically, the plug is equipped with an electronic tag.

[0016] Specifically, the gland, packing box, spacer box, and plug are all provided with threaded holes on their outer walls, and the threaded holes are detachably connected to handles for easy rotation.

[0017] Based on the above technical solutions, the beneficial effects of the present invention are analyzed as follows:

[0018] This invention provides a wellhead polished rod sealing device, comprising:

[0019] A packing ejection mechanism includes a packing box and a packing ejector rod. The packing ejector rod is sleeved on a smooth rod, and the packing box is sleeved on the packing ejector rod and threadedly connected to it. The packing box, the packing ejector rod, and the smooth rod form an annular receiving cavity for accommodating the packing. Rotation of the packing box around the packing ejector rod changes the length of the annular receiving cavity.

[0020] In practical applications, the packing is stacked and installed within the annular cavity formed by the packing box, the packing top rod, and the guide rod to seal the guide rod. When the packing needs to be replaced, the packing box is rotated around the packing top rod to shorten the length of the annular cavity, thereby allowing the packing to be pushed out by the packing top rod.

[0021] As can be seen, compared with existing technologies, this wellhead polished rod sealing device forms an adjustable-length annular receiving cavity through the threaded connection between the packing box and the packing push rod. By shortening the annular receiving cavity, the packing is pushed out of the annular receiving cavity by the packing push rod, eliminating the need for auxiliary tools and achieving rapid packing replacement. This overcomes the technical problem of existing packing boxes where the packing replacement process relies on auxiliary tools and is inconvenient to operate, resulting in long processing times. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the wellhead polished rod sealing device provided in an embodiment of the present invention.

[0024] icon:

[0025] 001. Bare shaft; 002. Packing;

[0026] 100. Packing gland ejection mechanism; 101. Annular receiving cavity; 110. Packing gland box; 120. Packing gland ejector rod; 130. Pressure cap; 102. Threaded hole; 131. Wear-resistant bushing; 140. Packing gland box ejector screw;

[0027] 200. Second sealing mechanism; 201. Sealing cavity; 210. Sealing box; 220. Sealing top rod; 230. Glue core; 240. Sealing box top screw;

[0028] 300. Slide adjustment mechanism; 310. Slide; 320. Clamp body; 330. Slide adjusting screw; 340. Plug; 350. Plug set screw. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] Existing packing boxes have technical problems such as the need for auxiliary tools and inconvenient operation during the packing replacement process, resulting in long processing times.

[0033] In view of this, the present invention provides a wellhead polished rod sealing device, comprising:

[0034] The packing ejection mechanism 100 includes a packing box 110 and a packing ejector rod 120. The packing ejector rod 120 is sleeved on a smooth rod 001, and the packing box 110 is sleeved on the packing ejector rod 120 and threadedly connected to it. The packing box 110, the packing ejector rod 120, and the smooth rod 001 form an annular receiving cavity 101 for accommodating the packing 002. The rotation of the packing box 110 around the packing ejector rod 120 changes the length of the annular receiving cavity 101.

[0035] In summary, the wellhead polished rod sealing device provided by this invention can achieve the following technical effects:

[0036] This wellhead polished rod sealing device forms an adjustable-length annular receiving cavity 101 through a threadedly connected packing box 110 and packing push rod 120. By shortening the annular receiving cavity 101, the packing 002 is pushed out of the annular receiving cavity 101 by the packing push rod 120, achieving the purpose of quick replacement of the packing 002 without the need for auxiliary tools. This overcomes the technical problem of existing packing boxes where the replacement process relies on auxiliary tools and is inconvenient to operate, resulting in long time consumption.

[0037] The following combination Figure 1 The structure and shape of the wellhead polished rod sealing device provided in this embodiment are described in detail below:

[0038] In an optional embodiment, the thread pitch between the packing box 110 and the packing push rod 120 is taken as the thickness of a single packing 002, and the packing box 110 pushes out one packing 002 for each revolution.

[0039] In this embodiment, the packing ejection mechanism 100 further includes a pressure cap 130 and a packing box set screw 140. The pressure cap 130 is threaded to the end of the packing box 110 away from the packing ejector rod 120 and is sleeved on the smooth rod 001. It is used to close the annular receiving cavity 101 and apply pressure to the packing 002 stacked in the annular receiving cavity 101 to make the packing 002 fit tightly against the smooth rod 001. The packing box 110 is fixed to the packing ejector rod 120 by the packing box set screw 140 to lock the size of the annular receiving cavity 101.

[0040] To save time spent on the wellbore pressure venting step before replacing packing 002, the wellhead polished rod sealing device in this embodiment further includes a second sealing mechanism 200. The second sealing mechanism 200 includes a sealing box 210, a sealing top rod 220, a rubber core 230, and a sealing box top screw 240. The sealing top rod 220 is sleeved on the polished rod 001, and the sealing box 210 is sleeved on and threadedly connected to the sealing top rod 220. The sealing box 210, the sealing top rod 220, and the polished rod 001 form a sealing cavity 201, and the rubber core 230 is installed in the sealing cavity 201. The rotation of the septum box 210 around the septum top rod 220 changes the size of the septum cavity 201, causing the rubber core 230 to be compressed and grip the polished rod 001. This is used to temporarily seal the polished rod 001 in place of the packing 002 during packing 002 replacement, eliminating the need to vent the oil pressure in the well and shortening the operation time. The septum box 210 is fixed to the septum top rod 220 by the septum box top screw 240, so that the size of the septum cavity 201 is locked, and at the same time, the sealing state of the second septum mechanism 200 on the polished rod 001 is fixed.

[0041] In order to improve the sealing effect of the rubber core 230, in this embodiment, the sealing cavity 201 is set as a cone shape to increase the clamping force of the rubber core 230 on the light rod 001 when it is squeezed.

[0042] In this embodiment, the wellhead polished rod sealing device further includes a sliding plate adjustment mechanism 300, which includes a clamp body 320, a sliding plate 310, and sliding plate adjustment screws 330. The clamp body 320 is sleeved on the polished rod 001. The sliding plate 310 is installed on the clamp body 320 and sleeved on the polished rod 001. The packing top rod 120 is connected to the end of the spacer box 210 away from the spacer top rod 220, and the spacer top rod 220 is connected to the end of the sliding plate 310 away from the clamp body 320. Multiple sliding plate adjustment screws 330 are evenly distributed around the axis of the clamp body 320 and abut against the outer periphery of the sliding plate 310 to adjust the radial position of the sliding plate 310 and the polished rod 001, thereby driving the packing 002 to be coaxial with the polished rod 001. By rotating the adjusting screw 330 on the clamp body 320 to abut and push the sliding plate 310, the radial position of the sliding plate 310 and the guide rod 001 is adjusted, thereby adjusting the radial position of the packing box 110 and the guide rod 001, and thus making the packing 002 and the guide rod 001 coaxial, preventing the guide rod 001 from causing uneven wear on the packing 002. The packing top rod 120 and the spacer box 210 are configured as an integrated component connected together, with the external thread as the boundary, the upper part being the packing top rod 120 and the lower part being the spacer box 210. The spacer top rod 220 and the sliding plate 310 are configured as an integrated component connected together, with the external thread as the boundary, the upper part being the spacer top rod 220 and the lower part being the sliding plate 310.

[0043] In this embodiment, the slide adjustment mechanism 300 further includes a plug 340 and a plug set screw 350. The plug 340 is threadedly connected to the clamp body 320 and abuts against the slide 310; the rotation of the plug 340 around the clamp body 320 is used to apply a thrust to the slide 310 so that the slide 310 abuts against the clamp body 320, and the clamping force of the plug 340 on the slide 310 is used to fasten the slide 310; multiple plug set screws 350 are evenly distributed around the axis of the clamp body 320 and abut against the outer periphery of the plug 340 respectively, so that the plug 340 is fixed to the clamp body 320.

[0044] Regarding how the gland 130, packing box 110, spacer box 210, and plug 340 rotate, specifically:

[0045] The gland 130, packing box 110, spacer box 210, and plug 340 all have multiple threaded holes 102 on their outer walls. Each threaded hole 102 is detachably connected to a universal handle for easy rotation. All threaded holes 102 are of uniform specifications.

[0046] To straighten the guide rod 001 and reduce uneven wear on the packing 002, in this embodiment, the pressure cap 130, the packing top rod 120, and the spacer box 210 are all provided with wear-resistant bushings 131 on their contact surfaces with the guide rod 001. Each wear-resistant bushing 131 is divided into two halves for easy replacement after wear. The wear-resistant bushing 131 also records the uneven wear state of the guide rod 001. The material of the wear-resistant bushing 131 can be tin bronze.

[0047] To further improve the sealing performance of the wellhead polished rod sealing device, in this embodiment, sealing rings are provided between the packing box 110 and the packing top rod 120, between the septum box 210 and the septum top rod 220, and between the clamp body 320 and the slide plate 310.

[0048] To avoid the problems of rust, corrosion, and unclear lettering when using conventional signs, the solution in this embodiment includes pre-drilled holes for electronic tag installation in the plug 340 during manufacturing, and the electronic tags are pre-sealed at the factory. The sealed electronic tags can be used with a handheld reader to query basic information, record usage and replacement, and synchronize data for the wellhead polished rod sealing device, facilitating daily management.

[0049] In summary, the specific working process of the wellhead polished rod sealing device provided in this embodiment is as follows:

[0050] In daily management, a handheld reader is used to query, record, and synchronize basic information about the wellhead polished rod sealing device by scanning the electronic tag encapsulated in the plug 340.

[0051] When packing 002 needs to be replaced, first stop the pumping unit suspension rope in the appropriate position, loosen the packing box top screw 240, rotate the packing box 110 to drive the packing box 210 to rotate, compress the rubber core 230 to seal the polished rod 001, tighten the packing box top screw 240, rotate and remove the pressure cap 130, loosen the packing box top screw 140, rotate the packing box 110 to shorten the annular receiving cavity 101, and push the packing 002 out of the annular receiving cavity 101 by the packing push rod 120. Then rotate the packing box 110 to restore the annular receiving cavity 101 to its original length and tighten the packing box top screw 140. Insert the new packing 002 in sequence, rotate the pressure cap 130 to appropriately compress the packing 002. Loosen the packing box top screw 240, rotate the packing box 110 to drive the packing box 210 to rotate, release the rubber core 230, and release the seal on the polished rod 001.

[0052] When the packing box 110 needs to be adjusted, the wear condition of the polished rod 001 can be observed through the wear-resistant bushing 131 on the upper part of the pressure cover 130. There are two methods to adjust it according to the degree of wear:

[0053] First, the wear is quite severe. Based on the wear condition of the wear-resistant bushing 131, determine the eccentric direction and the amount of adjustment displacement. Tighten the slide adjustment screw 330 to push the slide 310 to the corresponding position. If it is difficult to tighten the slide adjustment screw 330, slightly rotate the plug 340 to reduce the clamping force on the slide 310. Then tighten the slide adjustment screw 330 to move the slide 310 to the corresponding position, and then rotate the plug 340 to tighten the slide 310.

[0054] Second, if the wear is small, loosen the top screw 240 of the spacer box, rotate the spacer box 210, drive the packing 002 and the pressure cap 130 to rotate and offset the worn parts, then tighten the top screw 240 of the spacer box and press the pressure cap 130.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wellhead polished rod sealing device, characterized in that... ,include: A packing ejection mechanism (100) includes a packing box (110) and a packing ejector rod (120). The packing ejector rod (120) is sleeved on a smooth rod (001). The packing box (110) is sleeved on the packing ejector rod (120) and threadedly connected to the packing ejector rod (120). The packing box (110), the packing ejector rod (120), and the smooth rod (001) form an annular receiving cavity (101) for accommodating packing (002). The rotation of the packing box (110) around the packing ejector rod (120) is used to change the length of the annular receiving cavity (101).

2. The wellhead polished rod sealing device according to claim 1, characterized in that: It also includes a second sealing mechanism (200), which includes a sealing box (210), a sealing top rod (220), and a rubber core (230); the sealing top rod (220) is sleeved on the smooth rod (001), and the sealing box (210) is sleeved on the sealing top rod (220) and threadedly connected to the sealing top rod (220); the sealing box (210), the sealing top rod (220), and the smooth rod (001) form a sealing cavity (201), and the rubber core (230) is installed in the sealing cavity (201); the rotation of the sealing box (210) around the sealing top rod (220) can change the size of the sealing cavity (201) so that the rubber core (230) is squeezed and holds the smooth rod (001).

3. The wellhead polished rod sealing device according to claim 2, characterized in that: It also includes a slide adjustment mechanism (300), which includes a clamp body (320), a slide (310), and slide adjustment screws (330); the clamp body (320) is sleeved on the guide rod (001); the slide (310) is installed on the clamp body (320) and sleeved on the guide rod (001); the packing top rod (120) is connected to the end of the spacer box (210) away from the spacer top rod (220), and the spacer top rod (220) is connected to the end of the slide (310) away from the clamp body (320); a plurality of slide adjustment screws (330) are evenly distributed around the axis of the clamp body (320) and respectively abut against the outer periphery of the slide (310) to adjust the radial position of the slide (310) and the guide rod (001).

4. The wellhead polished rod sealing device according to claim 3, characterized in that: The packing ejection mechanism (100) further includes a pressure cap (130), which is threaded to the end of the packing box (110) away from the packing ejector rod (120) and sleeved on the smooth rod (001) to close the annular receiving cavity (101) and apply pressure to the packing (002) stacked in the annular receiving cavity (101) so that the packing (002) is tightly attached to the smooth rod (001).

5. The wellhead polished rod sealing device according to claim 4, characterized in that: The pressure cap (130), the packing top rod (120), and the spacer box (210) are all provided with wear-resistant bushings (131) on the contact surface with the light rod (001).

6. The wellhead polished rod sealing device according to claim 1, characterized in that: The packing ejection mechanism (100) further includes a packing box ejector screw (140), and the packing box (110) is fixed to the packing ejector rod (120) by the packing box ejector screw (140).

7. The wellhead polished rod sealing device according to claim 2, characterized in that: The second sealing mechanism (200) further includes a sealing box top screw (240), and the sealing box (210) is fixed to the sealing top rod (220) by the sealing box top screw (240).

8. The wellhead polished rod sealing device according to claim 4, characterized in that: The slide adjustment mechanism (300) further includes a plug (340) and a plug set screw (350); the plug (340) is threadedly connected to the clamp body (320) and abuts against the slide (310); the rotation of the plug (340) around the clamp body (320) is used to apply a thrust to the slide (310) so that the slide (310) abuts against the clamp body (320); a plurality of plug set screws (350) are evenly distributed around the axis of the clamp body (320) and abut against the outer periphery of the plug (340) respectively.

9. The wellhead polished rod sealing device according to claim 8, characterized in that: An electronic tag is installed in the plug (340).

10. The wellhead polished rod sealing device according to claim 8, characterized in that: The pressure cap (130), the packing box (110), the spacer box (210) and the plug (340) are all provided with threaded holes (102) on their outer walls. The threaded holes (102) are detachably connected to a handle for easy rotation.

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