A wax scraping device for preventing stuck self-flowing wells

Abstract

The present invention discloses an anti-stuck self-flowing well wax scraping device, comprising a connecting rod, a positioning slider, an upper adjustment spring, a lower adjustment spring, a left wax scraping blade and a right wax scraping blade. A spiral line is provided on the outer surface of the connecting rod, and the positioning slider can rotate and move up and down along the connecting rod under the action of the spiral line; the left wax scraping blade and the right wax scraping blade are respectively connected to the two ends of the positioning slider, and the left wax scraping blade and the right wax scraping blade are symmetrically provided with an upper spring positioning hole and a lower spring positioning hole. The two sides of the column of the positioning slider are respectively provided with an upper positioning hole of the slider and a lower positioning hole of the slider, an upper adjustment spring is provided between the relatively arranged upper spring positioning hole and the upper positioning hole of the slider, and a lower adjustment spring is provided between the relatively arranged lower spring positioning hole and the lower positioning hole of the slider. The wax scraping blade can be loosened or tightened under the action of the adjustment spring. When encountering hard wax, the wax scraping blade passes through under the action of the spring buffering force, thereby reducing the risk of well jamming.

Description

Technical Field

[0001] The invention relates to the technical field of oil production, in particular to a wax scraping tool used for manual mechanical wax removal operations in daily maintenance of oilfield self-flowing wells. Background Art

[0002] As crude oil flows downhole into the wellbore and rises from the bottom of the well to the wellhead, the dissolved paraffin wax crystallizes as the temperature and pressure decrease and gas precipitates. As the temperature drops further, the paraffin wax continues to precipitate, and the wax crystals grow, aggregate, and deposit on the pipe wall, resulting in wax deposition.

[0003] Wax buildup in the tubing reduces its diameter, increases resistance to oil flow, and reduces well production. In severe cases, it can block the well or cause the pump to become stuck. Wax buildup in deep-well pumps can easily cause pump leakage, reduce the pump's fill factor, and reduce the production of the pumping well. During the production process, self-flowing wells require regular manual mechanical wax removal. Using a wax scraper is one of the most effective methods for removing paraffin precipitated from the tubing. However, existing wax scrapers are prone to hard jamming in high-wax wells, resulting in poor wax scraping and blind spots. Furthermore, replacing the wax scraper blades is cumbersome. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide an anti-stuck self-flowing well wax scraping device, whose wax scraping blade can be loosened or tightened under the action of an adjusting spring. When encountering hard wax, the wax scraping blade is acted upon by the spring buffering force, thereby reducing the risk of well jamming and reducing workload.

[0005] To achieve the above-mentioned purpose, the present application proposes an anti-stuck self-flowing well wax scraping device, including a connecting rod, a positioning slider, an upper adjusting spring, a lower adjusting spring, a left wax scraping piece and a right wax scraping piece. A spiral line is provided on the outer surface of the connecting rod, and the positioning slider can rotate and move up and down along the connecting rod under the action of the spiral line; the two ends of the positioning slider are respectively connected to the left wax scraping piece and the right wax scraping piece, and the left wax scraping piece and the right wax scraping piece are symmetrically provided with an upper spring positioning hole and a lower spring positioning hole, and the two sides of the column of the positioning slider are respectively provided with an upper positioning hole of the slider and a lower positioning hole of the slider, an upper adjusting spring is provided between the relatively arranged upper spring positioning hole and the upper positioning hole of the slider, and a lower adjusting spring is provided between the relatively arranged lower spring positioning hole and the lower positioning hole of the slider.

[0006] Furthermore, the connecting rod is a solid steel rod, and connecting couplings are provided at the upper and lower ends of the solid steel rod.

[0007] Furthermore, the connecting collar is connected to the connecting ring.

[0008] Furthermore, one end of the connecting ring is a threaded buckle and the other end is a circular ring, and the threaded end is fixed to the connecting rod through a connecting coupling.

[0009] Furthermore, the left wax scraping blade and the right wax scraping blade are symmetrical structures, and each wax scraping blade includes an arc-shaped blade located at the end, and a blade tip is provided on the arc-shaped blade.

[0010] Furthermore, a blade groove is provided in the middle of the left wax scraper blade and the right wax scraper blade.

[0011] Furthermore, the left wax scraper blade and the right wax scraper blade can be spirally raised and lowered under the drive of the positioning slider.

[0012] Furthermore, the range of the spiral ascent and descent of the left wax scraper blade and the right wax scraper blade is between the two connecting collars.

[0013] Furthermore, the left wax scraper blade and the right wax scraper blade are cylindrical in shape.

[0014] Furthermore, a wax scraping plate connecting plate is provided on the inner side of the left wax scraping plate and the right wax scraping plate, and an upper spring positioning hole and a lower spring positioning hole are provided on the wax scraping plate connecting plate.

[0015] Furthermore, a connecting hole is provided in the middle of the wax scraper connecting plate, which is connected to the positioning slider through a connecting pin.

[0016] Furthermore, the blade tip is bent inward.

[0017] The above technical solution adopted by the present invention offers the following advantages over the existing technology: the wax scraper blade designed in the present invention adopts a bilaterally symmetrical structure. Under the action of the plumb bob's gravity, it moves downward, and the force is evenly applied to both sides of the wax scraper blade. Simultaneously, the wax scraper blade, driven by the positioning slider, rotates up and down along the spiral slide rail. Therefore, when scraping wax, it moves longitudinally along different trajectories, forming disordered scraping marks on the inner wall of the oil pipe, thereby achieving all-round wax scraping within the wellbore. The wax scraper blade can be loosened or tightened by adjusting the spring. When encountering hard wax, the wax scraper blade is buffered by the spring and passes through, reducing the risk of well obstruction.

[0018] The present invention adopts a modular structure as a whole. When the wire rope is well connected, it is only necessary to disassemble the connecting rod, remove the old wax scraper and replace it with a new one. The operation is convenient and quick, and there is no need to make a new wire joint, which reduces the workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a wax scraping device for preventing sticking and flowing wells;

[0020] Figure 2 It is a schematic diagram of the structure of the wax scraping blade;

[0021] Figure 3 This is a schematic diagram of the positioning slider structure.

[0022] Explanation of the serial numbers in the figure: 1. Connecting ring; 2. Connecting coupling; 3. Connecting rod; 4. Positioning slider; 5. Connecting pin; 6. Lower adjusting spring; 7. Wax scraper on the left; 8. Wax scraper on the right; 9. Knife tip; 10. Knife edge; 11. Knife groove; 12. Spiral line; 13. Wax scraper connecting plate; 14. Connecting hole; 15. Upper spring positioning hole; 16. Lower spring positioning hole; 18. Spiral through hole; 19. Upper positioning hole of slider; 20. Lower positioning hole of slider; 21. Connecting hole of wax scraper blade on the left side of slider; 22. Connecting hole of wax scraper blade on the right side of slider. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. That is, the embodiments described herein are only some embodiments of this application, not all embodiments. Generally, the components of the embodiments of this application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present application.

[0025] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the elements defined by the phrase "comprises..." do not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the elements.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] Example 1

[0029] like Figure 1 As shown, this embodiment provides an anti-stuck self-flowing well wax scraping device, including a connecting rod, a positioning slider, an upper adjusting spring, a lower adjusting spring, a left wax scraping piece and a right wax scraping piece. A spiral line is provided on the outer surface of the connecting rod, and the positioning slider can rotate and move up and down along the connecting rod under the action of the spiral line; the two ends of the positioning slider are respectively connected to the left wax scraping piece and the right wax scraping piece, and the left wax scraping piece and the right wax scraping piece are symmetrically provided with an upper spring positioning hole and a lower spring positioning hole, and the two sides of the column of the positioning slider are respectively provided with an upper positioning hole of the slider and a lower positioning hole of the slider, an upper adjusting spring is provided between the relatively arranged upper spring positioning hole and the upper positioning hole of the slider, and a lower adjusting spring is provided between the relatively arranged lower spring positioning hole and the lower positioning hole of the slider.

[0030] like Figure 2 As shown, the spiral through hole 18 on the column of the positioning slider passes through from top to bottom, and is sleeved on the connecting rod through the spiral through hole. There are outwardly extending slider left wax scraper blade connection hole 21 and slider right wax scraper blade connection hole 22 on both sides of the column.

[0031] The connecting rod is a solid steel rod, and the upper and lower ends of the solid steel rod are fixed to the connecting collar 2. The connecting collar is connected to the connecting ring.

[0032] One end of the connecting ring 1 is a threaded buckle, and the other end is a circular ring. The threaded end is connected and fixed to the connecting rod 3 through a connecting collar 2.

[0033] The connecting rod 3, the connecting ring 1, the connecting coupling 2, and the spiral line 12 are connected according to the above structural relationship to form a complete connecting rod system.

[0034] like Figure 3 As shown, the left wax scraper 7 and the right wax scraper 8 are symmetrical structures, each comprising a blade tip 9, a blade 10, and a blade groove 11. The blade groove 11 serves as a viewing window, and tools such as a screwdriver can be inserted therein.

[0035] The left wax scraper 7 and the right wax scraper 8 can be spirally raised and lowered within a certain range of the connecting rod 3 under the drive of the positioning slider 4. The upper and lower connecting couplings 2 can be used as limit controls to control the range of movement of the left wax scraper 7 and the right wax scraper 8.

[0036] The left wax scraper 7 and the right wax scraper 8 are double-edged bilaterally symmetrical structures, and are in the shape of cylindrical surfaces.

[0037] The left and right wax scraping plates are provided with wax scraping plate connecting plates on the inside, and are provided with upper spring positioning holes 15 and lower spring positioning holes 16. A connecting hole is provided in the middle of the wax scraping plate connecting plate, which is connected to the positioning slider through a connecting pin.

[0038] The knife tip 9 is bent inwards so that when encountering a hardened tube wall, it can slide through smoothly and avoid hard jamming.

[0039] The present invention provides a wax scraping device for a self-flowing well that prevents sticking. (1) The wax scraping blade is easy to replace: the original wax scraping blade needs to be replaced by disconnecting the steel wire and re-making a steel wire joint to connect the scraping blade. The present invention adopts a modular structure. When the steel wire rope is connected in good condition, it is only necessary to disassemble the connecting rod, remove the old wax scraping blade, and replace it with a new wax scraping blade. The operation is convenient and safe, and there is no need to re-make a steel wire joint. (2) The wax scraping blade has a strong wax removal ability for high-wax wells: the original wax scraping blade has an asymmetrical structure, with force applied on one side to scrape the wax, which is not thorough and easy to get stuck when encountering obstacles. The present invention adopts a double-blade symmetrical structure, with force applied evenly on both sides, scraping the wax in all directions, cleaning thoroughly, and evenly applying force when encountering obstacles, so it is not easy to get stuck. The wax scraping blade can be spirally raised and lowered under the drive of the positioning slider, running along different trajectories when scraping wax, and scraping the wax thoroughly on the inner wall of the oil pipe. (3) The diameter of the wax scraping blade is variable: the wax scraping blade can be loosened or tightened under the action of the adjustment spring to avoid hard sticking in high-wax wells and to ensure smooth wax scraping. (4) Fixed diameter and roundness of the wax scraper blade: The original device used manual force to change the diameter, resulting in a non-circular and irregular cross-section of the wax scraper blade, which caused dead angles during wax removal in wells with high wax content. The present invention uses fixed diameter and roundness. Depending on the severity of wax accumulation, different specifications of wax scrapers can be selected at any time during the wax removal process or when the oil well production changes, ensuring thorough wax scraping and smooth lifting and lowering.

[0040] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A wax scraping device for preventing stuck self-flowing wells, characterized in that: The cam is provided with a spring which is adapted to move the cam upwards and downwards along the cam, and the cam is adapted to move the cam upwards and downwards along the cam. The left and right wax scraping blades are symmetrical in structure, and each wax scraping blade includes an arc-shaped blade at the end, and a blade tip is provided on the arc-shaped blade; The left wax scraper and the right wax scraper are provided with a blade groove in the middle. The left wax scraping blade and the right wax scraping blade can spirally rise and fall under the drive of the positioning slider; The knife tip is bent inward.

2. The wax scraping device for preventing sticking and flowing wells according to claim 1, characterized in that: The connecting rod is a solid steel rod, and connecting couplings are provided at the upper and lower ends of the solid steel rod.

3. The wax scraping device for preventing sticking and flowing wells according to claim 2, characterized in that: The connecting collar is connected to the connecting ring.

4. The wax scraping device for preventing sticking and flowing wells according to claim 3, characterized in that: One end of the connecting ring is a threaded buckle, and the other end is a circular ring. The threaded end is fixed to the connecting rod through a connecting hoop.

5. The wax scraping device for preventing sticking and flowing wells according to claim 1, characterized in that: The range in which the left wax scraping blade and the right wax scraping blade spirally rise and fall is between the two connecting collars.

6. The wax scraping device for preventing sticking and flowing wells according to claim 1, characterized in that: The left wax scraping blade and the right wax scraping blade are in the shape of cylindrical surfaces.

7. The wax scraping device for preventing sticking and flowing wells according to claim 1, characterized in that: A wax scraping piece connecting plate is provided on the inner side of the left wax scraping piece and the right wax scraping piece. An upper spring positioning hole and a lower spring positioning hole are provided on the wax scraping piece connecting plate.

8. The wax scraping device for preventing sticking and flowing wells according to claim 7, characterized in that: A connecting hole is provided in the middle of the wax scraper connecting plate, which is connected to the positioning sliding block through a connecting pin.

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