Self-sealing wellhead packing box convenient for packing replacement

Abstract

The self-sealing well mouth packing box comprises a packing body, a filling cavity is formed in the packing body, one end of the filling cavity is a filling end, a lifting sleeve matched with the filling cavity is arranged in the filling cavity, the lifting sleeve is movably arranged in the filling cavity, the length of the lifting sleeve is smaller than that of the filling cavity, and the filling end is connected with the lifting sleeve. The packing body is provided with an adjusting mechanism used for driving the lifting sleeve to move towards the filling end. Compared with the prior art, the packing which is originally filled can be quickly ejected out through the lifting sleeve, time and labor are saved compared with prizing out from the filling end, the side wall of the filling cavity can be cleaned, residual bonding is prevented, the sealing quality of the newly-filled packing is guaranteed, and after the original packing inside is cleaned, the packing is reset, and then the new packing can be filled. And the whole process is beneficial to shortening wellhead operation time.

Description

TECHNICAL FIELD

[0001] The utility model relates to sucker rod sealing device technical field, concretely relates to a self -sealing well head packing box convenient to packing replacement. BACKGROUND

[0002] In the oil production process, usually utilize the pumping unit to carry out the exploitation work of crude oil, and the packing box is a sucker rod sealing device of pumping unit well head, and it plays the role of sealing the annular space between the oil pipe and the sucker rod in the normal working process of the oil well. In the reciprocating motion process of the sucker rod of the pumping unit, the packing box is used for sealing oil, gas and water, etc. to prevent the overflow of oil, gas and water. The conventional packing box is prone to oil overflow and environmental pollution when the sucker rod is broken, therefore, a patent with the patent number "CN208669254U" and the name "self -sealing well head packing box with pressure" appears in the prior art, which can realize the isolation of the sucker rod channel by increasing the transverse sealing device.

[0003] The applicant found in the continuous research that, during the use of the packing box, the sucker rod reciprocates, and the packing is continuously extruded, which leads to the replacement of the packing in the later stage being extremely troublesome, especially when rubber is used as the packing, after compaction in the later stage, the packing can only be pried out little by little by using a tool, which is time-consuming and labor-consuming, prolongs the wellhead operation time and increases the operation risk. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a self -sealing well head packing box convenient to packing replacement, which aims at solving the problem of inconvenient packing replacement operation of the current well head packing box.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A self -sealing well head packing box convenient to packing replacement, comprising a packing body, the packing body is provided with a filling cavity, one end of the filling cavity is a filling end, and the key lies in that the filling cavity is provided with a lifting sleeve matched with the filling cavity, the lifting sleeve is movably arranged in the filling cavity, the length of the lifting sleeve is less than the length of the filling cavity, and the packing body is provided with an adjusting mechanism for driving the lifting sleeve to move towards the filling end.

[0007] By adopting the above scheme, when the packing needs to be replaced, the adjusting mechanism is used to drive the lifting sleeve to rise, so that the internal filler can be pushed out, which is more time-saving and labor-saving than prying out from the filling end, shortens the wellhead operation time, can clean the side wall of the filling cavity, prevents residual adhesion, ensures the sealing quality of the new filled packing, and after cleaning the internal original packing, the new packing can be filled by resetting.

[0008] As preferred: the disc base body has a window corresponding to the lifting sleeve, the adjusting mechanism comprises a gear shaft corresponding to the window, and the side wall of the lifting sleeve has a tooth segment arranged along the length direction, and the gear shaft is engaged with the tooth segment. With the above scheme, the rotation of the gear shaft is transmitted to the linear motion of the lifting sleeve in a gear-driven manner, which is relatively more labor-saving, the overall structure is simple, and implementation is facilitated.

[0009] As preferred: the adjusting mechanism further comprises a gear shaft sleeve, the side wall of the gear shaft sleeve has a notch corresponding to the window, the notch edge is sealingly fixed with the window edge, the gear shaft is arranged in the gear shaft sleeve, the tail end of the gear shaft is exposed to the outside of the gear shaft sleeve, and the gear shaft sleeve is provided with a sleeve nut. With the above scheme, the overall assembly compactness and sealing performance can be improved.

[0010] As preferred: after assembly, in the initial state, the window is close to the upper end of the lifting sleeve. With the above scheme, the lifting sleeve has a larger moving stroke, and it is ensured that the internal filler can be completely pushed out or the lifting sleeve can be taken out.

[0011] As preferred: the tail end of the gear shaft has an inner square structure or an outer square structure. With the above scheme, the gear shaft can be rotated by using a matched tool, which is relatively more labor-saving.

[0012] As preferred: a gasket is arranged between the lifting sleeve and the bottom of the filling cavity. With the above scheme, the gasket improves the sealing performance between the bottom of the lifting sleeve and the bottom of the filling cavity, that is, the end sealing performance.

[0013] As preferred: the lifting sleeve and the filling cavity have an axial guide structure. With the above scheme, the lifting stability of the lifting sleeve can be ensured, the rotation is prevented from causing disengagement or being stuck, the reliability is improved, and the like.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The self-sealing wellhead packing box provided by the utility model can quickly push out the original packing by the lifting sleeve, which is more time-saving and labor-saving than prying from the filling end, can clean the side wall of the filling cavity to prevent residual adhesion and ensure the sealing quality of the newly filled packing, and the like. After the internal original packing is cleaned, the new packing can be filled by resetting, and the whole process is beneficial to shorten the wellhead operation time. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic view of the utility model;

[0017] Figure 2 The figure is a side view of the installation of the adjusting mechanism on the disc base body;

[0018] Figure 3 is a dissection view of the adjusting mechanism;

[0019] Figure 4 is a structural schematic view of the gear shaft;

[0020] Figure 5 is a structural schematic view of the gear shaft sleeve;

[0021] Figure 6 is a structural schematic view of the lifting sleeve;

[0022] Figure 7 is a structural schematic view of the packing base body.

[0023] In the figure: 1, packing base body; 10, filling cavity; 11, window; 2, lifting sleeve; 20, gear segment; 3, adjusting mechanism; 30, gear shaft; 31, gear shaft sleeve; 32, notch; 33, sleeve nut; 4, gasket; 5, valve body; 6, compression ring; 7, compression nut; A, packing. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the embodiments and the drawings.

[0025] Reference Figures 1 to 7 The self-sealing wellhead packing box convenient for packing replacement shown mainly includes a packing base body 1, the packing base body 1 has a filling cavity 10 in it, one end of the filling cavity 10 is a filling end, the lower part of the packing base body 1 and the rest of the structure are consistent or similar with the structure disclosed in the early patent with the patent number "CN208669254U" and the name "self-sealing wellhead packing box with pressure", the key of the present application lies in that the filling cavity 10 has a lifting sleeve 2 adapted thereto, the lifting sleeve 2 is movably arranged in the filling cavity 10, both can slide relatively, the length thereof is less than the length of the filling cavity 10, the packing base body 1 is provided with an adjusting mechanism 3 for driving the lifting sleeve 2 to move towards the filling end, so that the lifting sleeve 2 can be lifted or lowered to the filling end, and the filling end is used for filling the packing A. Figure 1 For reference, the upper end of the packing base body 1 is the filling end, in actual use, the packing is actually filled between the upper end of the lifting sleeve 2 and the filling end, the adjusting mechanism 3 can drive the lifting sleeve 2 to do vertical lifting movement, it needs to be noted that the inner diameter of the lifting sleeve 2 is generally slightly larger than the diameter of the sucker rod, so as to prevent the sucker rod from being abraded.

[0026] Reference Figure 4 , Figure 6 and Figure 7 In specific implementation, the packing base body 1 has a window 11 corresponding to the lifting sleeve 2 arranged on it, the adjusting mechanism 3 at least includes a gear shaft 30 corresponding to the window 11, the side wall of the lifting sleeve 2 has a gear segment 20 arranged along the length direction thereof, the gear shaft 30 is tangent to the lifting sleeve, and the gear ring thereon is engaged with the gear segment 20, so that when the gear shaft 30 is rotated, the lifting sleeve can be driven to lift or lower.

[0027] by Figure 1 For reference, after assembly, in the initial state, the lifting sleeve 2 abuts against the bottom of the filling cavity 10, while the window 11 is close to the upper end of the lifting sleeve 2. In this way, the upward stroke of the lifting sleeve 2 is basically consistent with its own length. At this time, as long as the vertical distance between the upper end of the lifting sleeve and the filling end is less than the length of the lifting sleeve 2, the filling packing can be completely pushed out.

[0028] To further ensure the internal sealing of the packing and to facilitate the installation and fixation of the gear shaft, the adjusting mechanism 3 also includes a gear shaft sleeve 31, such as... Figures 2 to 5 As shown, the side wall of the gear bushing 31 has a slot 32 that adapts to the window 11. When the two are facing each other, they can fit together perfectly. The edge of the slot 32 is sealed and fixed to the edge of the window 11, usually by welding. The gear bushing 31 is orthogonal to the axis of the chassis body 1. The gear shaft 30 is set inside the gear bushing 31, with its tail end protruding to the outside of the gear bushing 31 and equipped with a bushing nut 33. The bushing nut 33 mainly prevents the gear shaft 30 from coming out laterally. The bushing nut 33 is threadedly engaged with the gear bushing 31 and has a through hole for the gear shaft 30 to pass through. At the same time, the sealing performance can also be ensured by installing a sealing ring.

[0029] For ease of operation, the tail end of the gear shaft 30 has an inner square structure or an outer square structure, generally a square structure or a hexagonal structure, which makes it easier to twist with a wrench.

[0030] A gasket 4 is provided between the lifting sleeve 2 and the bottom of the filling cavity 10. The gasket 4 is preferably made of H62 material, which can greatly improve the end face sealing performance.

[0031] In addition, to prevent the lifting sleeve from rotating and improve its lifting reliability, an axial guide structure is provided between the lifting sleeve 2 and the filling cavity 10. For example, a guide protrusion is provided on the side wall of the filling cavity 10 along its length direction, and a guide groove that cooperates with the guide protrusion is provided on the outside of the lifting sleeve 2.

[0032] refer to Figures 1 to 7 The self-sealing wellhead packing box shown is easy to replace. Its usage process is as follows: Assemble the lower structure until the packing body 1 is fixed to the valve body 5. Then, install the gasket 4 and lifting sleeve 2 in the filling cavity 10 in sequence. Note that the toothed section 20 should be aligned with the window 11. Then, fix the adjusting mechanism 3 to the packing body 1 (or fix it after installing the gasket). Finally, add packing A, such as rubber or belt packing, into the filling cavity 10. After the packing is completed, the upper part can be tightened by the clamping ring 6 and the clamping nut 7.

[0033] When the inner packing needs to be replaced, the upper compression ring 6 and the compression nut 7 are removed first, then the gear shaft 30 is rotated to drive the lifting sleeve 2 to rise, so that the aging filler is pushed out, after all the old filler is pushed out, the gear shaft is reversed, the lifting sleeve is lowered and reset, then the new filler is installed, the compression ring 6 and the compression nut 7 are installed and compressed, and the replacement time is greatly shortened, and the wellhead operation risk is reduced.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without deviating from the purpose and claims of the present application. The transformation falls within the protection scope of the present application.

Claims

1. A self-sealing wellhead packing box facilitating packing replacement, comprising a packing body (1) having a filling cavity (10) therein, one end of the filling cavity (10) being a filling end, characterized in that: The filling cavity (10) has a lifting sleeve (2) matched therewith, the lifting sleeve (2) is movably arranged in the filling cavity (10), the length of the lifting sleeve (2) is less than the length of the filling cavity (10), and the disc base body (1) is provided with an adjusting mechanism (3) for driving the lifting sleeve (2) to move towards the filling end.

2. The self-sealing wellhead packing box that facilitates packing replacement according to claim 1, characterized in that: The disc base body (1) is provided with a window (11) corresponding to the lifting sleeve (2), the adjusting mechanism (3) at least comprises a gear shaft (30) corresponding to the window (11), and the side wall of the lifting sleeve (2) is provided with a tooth segment (20) in the length direction of the lifting sleeve (2), and the gear shaft (30) is engaged with the tooth segment (20).

3. The self-sealing wellhead packing box that facilitates packing replacement according to claim 2, characterized in that: The adjusting mechanism (3) further comprises a gear shaft sleeve (31), the side wall of the gear shaft sleeve (31) is provided with a notch (32) matched with the window (11), the edge of the notch (32) is sealingly fixed with the edge of the window (11), the gear shaft (30) is arranged in the gear shaft sleeve (31), the tail end of the gear shaft (30) is exposed to the outside of the gear shaft sleeve (31), and the gear shaft (30) is provided with a sleeve nut (33).

4. The self-sealing wellhead packing box facilitating packing replacement according to claim 2 or 3, characterized in that: After assembly, in the initial state, the window (11) is close to the upper end of the lifting sleeve (2).

5. The self-sealing wellhead packoff with facilitated packing replacement according to claim 2 or 3, characterized in that: The tail end of the gear shaft (30) has an inner structure or an outer structure.

6. The self-sealing wellhead packing box facilitating packing replacement according to any one of claims 1 or 3, characterized in that: The lifting sleeve (2) and the bottom of the filling cavity (10) are provided with a gasket (4).

7. The self-sealing wellhead packoff with facilitated packing replacement according to claim 2 or 3, characterized in that: The lifting sleeve (2) and the filling cavity (10) have an axial guide structure.

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