Sucker rod wellhead polish rod sealing structure of pumping unit

Abstract

The sucker rod wellhead polish rod sealing structure comprises a sealing box arranged on a sucker rod wellhead polish rod in a sleeving mode, the upper end and the lower end of the sealing box are open, the lower end of the sealing box is fixed to the upper end of a wellhead pipe, a gland is arranged at the upper end of the sealing box, a connecting pipe is arranged in the middle of the sealing box, and the connecting pipe is communicated with an inner cavity of the sealing box. The upper end and the lower end of an inner cavity of the sealing box are each provided with a sealing packing, and a containing cavity is formed between the interval space and the inner wall of the sealing box. A detachable reducer union is arranged at the outer end of the connecting pipe, and a detachable sealing cock is further arranged on the outer wall of the connecting pipe. According to the combined sealing structure, when sealing fails, sealant can be injected into the containing cavity through the sealant injection gun, the damaged combined sealing structure is repaired, shutdown is not needed, disassembly is not needed either, repairing is rapid, and the oil extraction efficiency is improved; meanwhile, a glue injection gun is used for glue injection repair, and operation is convenient. The combined sealing structure can be repeatedly used, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of pumping units, and particularly relates to a polished rod sealing structure for a pumping unit at the wellhead of a sucker rod. Background Art

[0002] A pumping unit is an oil production device widely used in oil fields. In order to prevent oil leakage at the wellhead during the continuous reciprocating movement of the pumping unit, a packing box is usually used to seal the polished rod at the wellhead of the sucker rod.

[0003] However, due to the long working time of the pumping unit, the high frequency of reciprocating movement of the sucker rod, and the harsh external environment, the packing is frequently damaged. When replacing the damaged packing, it is necessary to stop the machine and disassemble parts such as gland, etc., which is complicated in operation and reduces the oil production efficiency. Summary of the Utility Model

[0004] Aiming at the above defects, the technical problem to be solved by the utility model is to provide a polished rod sealing structure for a pumping unit at the wellhead of a sucker rod, so as to solve the problems in the prior art that after the packing is damaged, it is necessary to stop the machine and disassemble parts such as gland, etc. for replacement, which is complicated in operation and reduces the oil production efficiency.

[0005] To this end, the embodiment of the present application provides a polished rod sealing structure for a pumping unit at the wellhead of a sucker rod, which includes a sealing box sleeved on the polished rod at the wellhead of the sucker rod. The upper and lower ends of the sealing box are open, and the lower end is fixed to the upper end of the wellhead pipe. The upper end is provided with a gland, and the middle part is provided with a connecting pipe, and the connecting pipe is communicated with the inner cavity of the sealing box; the upper and lower ends of the inner cavity of the sealing box are respectively provided with packing, and the two groups of packing arranged up and down are spaced apart, and a receiving cavity is formed between the spaced space and the inner wall of the sealing box; the outer end of the connecting pipe is provided with a detachable reducing joint, and a through hole is also provided on the outer wall of the connecting pipe, and a detachable sealing plug is provided at the through hole.

[0006] Based on the above technical solutions, packing is respectively provided at the upper and lower ends of the sealing box, and a connecting pipe is provided in the middle part. A glue injection gun can be connected at the reducing joint, and sealant is injected into the receiving cavity between the two groups of packing through the glue injection gun, forming a combined sealing structure with the packing arranged up and down at intervals. When the seal fails, sealant can be injected into the receiving cavity through the glue injection gun to repair the damaged combined sealing structure, without the need to stop the machine or disassemble, with quick repair, improving the oil production efficiency; at the same time, using a glue injection gun to inject glue for repair is convenient in operation.

[0007] In the above technical solution, preferably, the sealant used is non-drying sealant.

[0008] In the above technical solution, preferably, a reinforcing seat is welded on the outer side surface at the through hole, and the sealing plug is installed on the reinforcing seat.

[0009] In the above technical solution, preferably, the reinforcing seat adopts a standard nut.

[0010] In the above technical solution, preferably, the gland is detachably connected to the upper end of the sealing box by threads.

[0011] In the above technical solution, preferably, the axis of the connecting pipe is perpendicular to the axis of the sealing box.

[0012] As can be seen from the above technical solution, the polished rod wellhead sealing structure of the pumping unit provided by the present utility model solves the problem that when replacing the damaged sealing packing in the prior art, it is necessary to stop the machine and disassemble parts such as the gland, which is complicated in operation and reduces the oil production efficiency. Compared with the prior art, the present utility model has the following beneficial effects:

[0013] When the seal fails, sealant can be injected into the accommodation cavity through a sealant gun to repair the damaged combined seal structure, without the need to stop the machine or disassemble, with rapid repair, improving the oil production efficiency; at the same time, using a sealant gun to inject sealant for repair is convenient in operation. The combined seal structure can be reused and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce and explain the drawings required for describing the embodiments of the present utility model or the prior art. Obviously, the drawings described below are only partial embodiments of the present utility model, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic diagram of the polished rod wellhead sealing structure of the pumping unit provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will clearly and completely describe the technical solutions of the embodiments of the present utility model with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the embodiments described below are only partial embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0017] In order to more clearly explain and illustrate the technical solutions and implementation manners of the present utility model, the following introduces several preferred specific embodiments for implementing the technical solutions of the present utility model.

[0018] It should be noted that the orientation terms such as "inside, outside", "front, back", and "left, right" in this article are described based on the product's usage state as the reference object. Obviously, the use of the corresponding orientation terms does not limit the protection scope of this solution.

[0019] As Figure 1 shown, a polished rod sealing structure for a pumping unit provided by the present utility model includes a sealing box 20 sleeved on the polished rod 10 of the pumping unit wellhead. The upper and lower ends of the sealing box 20 are open, and the lower end is fixed to the upper end of the wellhead pipe 30. A gland 40 is provided at the upper end, and a connecting pipe 50 is provided in the middle. The connecting pipe 50 communicates with the inner cavity of the sealing box 20. The axis of the connecting pipe 50 is perpendicular to the axis of the sealing box 20, that is, the sealing box 20 is vertically arranged, and then the connecting pipe 50 is horizontally arranged. Among them, the gland 40 is detachably connected to the upper end of the sealing box 20 by threads.

[0020] Sealing packing 60 is respectively provided at the upper and lower ends of the inner cavity of the sealing box 20. The sealing packing 60 is sleeved on the polished rod of the pumping unit wellhead. The two groups of sealing packing 60 arranged up and down are spaced apart, and a receiving cavity is formed between the spaced space and the inner wall of the sealing box 20.

[0021] A variable diameter joint 70 is detachably provided at the outer end of the connecting pipe 50 for connecting a glue injection gun. A through hole is also provided on the outer wall of the connecting pipe 50, and a detachable sealing plug 80 is provided at the through hole. In order to improve the strength at the through hole, a reinforcing seat 90 is welded on the outer side surface at the through hole, and the sealing plug 80 is installed on the reinforcing seat 90. The reinforcing seat 90 can adopt a standard nut.

[0022] In the solution of the present utility model, a glue injection gun can be connected at the variable diameter joint 70, and sealing glue 100 is injected into the receiving cavity between the two groups of sealing packing 60 through the glue injection gun, and a combined sealing structure is formed with the sealing packing 60 arranged up and down at intervals, realizing the sealing of the polished rod of the pumping unit wellhead.

[0023] When injecting the sealing glue, the sealing plug 80 needs to be removed. When the sealing glue overflows from the through hole at the sealing plug 80, it indicates that the receiving cavity has been filled with the sealing glue. At this time, install the sealing plug 80, and at the same time replace the variable diameter joint 70 with a sealing plug. When oil leakage occurs at the polished rod of the pumping unit wellhead after working for a period of time, the variable diameter joint 70 can be installed again, the sealing plug 80 can be opened, and sealing glue can be injected into the receiving cavity between the two groups of sealing packing 60 through the glue injection gun to repair the damaged combined sealing structure so that oil leakage no longer occurs at the polished rod of the pumping unit wellhead.

[0024] It can be seen from this that in the solution of the present utility model, when repairing the damaged combined sealing structure, there is no need to stop the machine, nor to disassemble. The repair is fast, improving the oil production efficiency; at the same time, using a glue injection gun to inject glue for repair is convenient to operate.

[0025] In the solution of this application, the sealant used is a non-drying sealant, such as BS-10 and BS-8 non-drying butyl sealants from the Shanghai Rubber Products Research Institute, etc.

[0026] Fiber filaments can be incorporated into the sealant to further improve the sealing effect and extend the service life of the sealant. For example, carbon fiber, spandex fiber, etc., with a length of 50 mm to 200 mm.

[0027] The reducing joint 70 can be matched with different specifications to adapt to different glue injection guns and improve applicability.

[0028] Based on the description of the above specific embodiments, the polished rod wellhead sealing structure of the pumping unit provided by the present utility model has the following advantages compared with the prior art:

[0029] First, sealing packing is respectively provided at the upper and lower ends of the seal box, a connecting pipe is provided in the middle, and a detachable reducing joint is provided at the outer end of the connecting pipe. A glue injection gun can be connected at the reducing joint, and sealant is injected into the accommodating cavity between the two groups of sealing packing through the glue injection gun, forming a combined sealing structure with the sealing packing arranged at intervals up and down. When the seal fails, sealant can be injected into the accommodating cavity through the glue injection gun to repair the damaged combined sealing structure, without the need to stop the machine or disassemble, with quick repair, improving the oil production efficiency; at the same time, using the glue injection gun for injecting glue for repair is convenient for operation.

[0030] Second, the sealant used is a non-drying sealant, and fiber filaments can be incorporated into the sealant to further improve the sealing effect and extend the service life of the sealant.

[0031] Third, the reducing joint can be matched with different specifications to adapt to different glue injection guns and improve applicability.

[0032] Finally, it should also be noted that the term "comprising", "including" or any other variant thereof used in this article is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0033] The present utility model is not limited to the above best implementation manner. Anyone should know that structural changes made under the inspiration of the present utility model, as long as they have the same or similar technical solutions as the present utility model, all fall within the protection scope of the present utility model.

Claims

1. A sucker rod wellhead polished rod sealing structure of an oil pumping unit, comprising a sealing box sleeved on the sucker rod wellhead polished rod, characterized in that: The upper and lower ends of the sealing box are open, and the lower end is fixed to the upper end of the wellhead pipe. The upper end is provided with a gland, and the middle part is provided with a connecting pipe, which is connected to the inner cavity of the sealing box. The upper and lower ends of the inner cavity of the sealing box are respectively provided with sealing packings, and the two groups of sealing packings arranged up and down are arranged at intervals, and a receiving cavity is formed between the interval space and the inner wall of the sealing box; The outer end of the connecting pipe is provided with a detachable reducing joint, and the outer wall of the connecting pipe is also provided with a through hole, and the through hole is provided with a detachable sealing cock.

2. The sucker rod wellhead polished rod sealing structure of the pumping unit according to claim 1, characterized in that: The accommodating cavity is filled with sealant, and the sealant used is non-drying sealant.

3. The sucker rod wellhead polished rod sealing structure of the oil pumping unit according to claim 1, characterized in that: A reinforcement seat is welded on the outer side surface of the through hole, and the sealing plug is installed on the reinforcement seat.

4. The sucker rod wellhead polished rod sealing structure of the oil pumping unit according to claim 3, characterized in that: The reinforcement seat adopts a standard nut.

5. The sucker rod wellhead polished rod sealing structure of the oil pumping unit according to claim 1, characterized in that: The gland is detachably connected to the upper end of the sealing box by thread.

6. The sucker rod wellhead polished rod sealing structure of the oil pumping unit according to claim 1, characterized in that: The axis of the connecting pipe is arranged perpendicular to the axis of the sealing box.

Images