Spiral scraper type underground paraffin scraping tool

Abstract

The utility model relates to the technical field of oil field underground testing, in particular to a spiral scraper type underground paraffin scraping tool. The spiral scraper type downhole paraffin scraping tool comprises an outer barrel and a shaft rod, the upper end of the outer barrel is of a cylindrical structure, the lower end of the outer barrel is of a hollow cylindrical structure, two opposite spiral grooves are formed in the outer wall of the outer barrel, a through hole is formed in the upper end of the shaft rod, a pin is arranged in the through hole, and the two ends of the pin penetrate through the spiral grooves of the outer barrel; a return spring is arranged at the upper end of the spiral shaft rod and embedded into the lower end of the outer barrel. According to the spiral scraper type underground wax scraping tool, the weighting rod is connected to the upper end of the outer cylinder and is lowered into a well, the shaft rod is stressed when encountering wax dirt, the pin moves from a low point to a high point along the spiral groove to drive the spiral shaft rod to rotate, the wax dirt is scraped through the spiral scraper, and the return spring provides elastic force; the shaft rod is ensured to reset to form a reciprocating scraping process after each time of scraping, wax dirt in a well is efficiently removed, a channel in the well is kept unblocked, and the production efficiency of the well is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field downhole testing, in particular to a spiral scraper type downhole wax scraping tool. Background Art

[0002] When conducting layered testing in water injection wells, it is usually necessary to use steel wire to lower the test instrument to a depth of more than 1,000 meters underground in order to salvage or deliver the plug. However, in actual operation, the test instrument often encounters some difficulties during the process of going down the well. These difficulties are mainly due to the large amount of oil wax and scale attached to the inner wall of the downhole tubing, which causes the inner diameter of the tubing to narrow, thereby getting the test instrument stuck inside the tubing. This situation not only makes it impossible to smoothly lower the test instrument to the predetermined layer, but also easily causes the steel wire to break when trying to forcibly pull it up, causing the test instrument to fall into the well and be difficult to salvage. In order to solve this problem, the wax scraping method is currently commonly used, that is, using a well scraper to scrape and remove the wax scale on the pipe wall. However, the existing well scrapers still have some significant problems in actual application.

[0003] Existing well scrapers typically use a scraping method that vibrates up and down. While this method can remove wax deposits from the pipe wall to a certain extent, due to the circular distribution of wax deposits on the inner wall of the downhole pipe, the up and down scraping method cannot effectively cover the entire circumference. Therefore, this scraping method is not very efficient in wax removal, and often requires multiple operations to achieve the desired effect. Existing well scrapers typically scrape wax using an annular blade mounted on the scraper rod. During the scraping process, the blade becomes coated with sticky wax deposits, losing its scraping effect. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] The utility model provides a spiral scraper type downhole wax scraping tool to overcome the problem in the prior art that the scraper has poor effect when scraping wax in a way of moving up and down, and the annular blade is wrapped by wax scale in the hanging wax, and the wax cannot be scraped to the test layer in one time.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides a spiral scraper type downhole wax scraping tool, comprising: an outer cylinder and a shaft;

[0008] The outer cylinder is composed of two parts, the upper end of the outer cylinder is a cylindrical structure, the lower end of the outer cylinder is a hollow cylindrical structure, and the outer wall of the lower end of the outer cylinder is provided with two opposite spiral grooves;

[0009] The groove depth of the two spiral grooves penetrates the outer wall of the outer cylinder;

[0010] A shaft is embedded in the lower end of the outer cylinder, a through hole is provided at the upper end of the shaft, and a pin is provided in the through hole;

[0011] The two ends of the pin pass through the two spiral grooves provided on the outer wall of the outer cylinder respectively, and the lower end of the shaft is provided with a spiral shaft;

[0012] The upper end of the shaft is provided with a return spring, and the return spring is embedded in the lower end of the outer cylinder;

[0013] A plurality of spiral scrapers are evenly arranged on the outer wall of the spiral shaft along the circumference.

[0014] Preferably, the return spring and the shaft are made as one piece, and the outer wall radius of the shaft is smaller than the inner wall radius of the outer cylinder.

[0015] Preferably, the spiral scraper is a curved steel scraper, and the spiral scraper is vertically mounted on the spiral shaft.

[0016] Preferably, the outer wall of the cylindrical structure at the upper end of the outer cylinder is provided with threads.

[0017] Preferably, the shaft and the spiral shaft are made as one piece, and the shaft radius is larger than the spiral shaft radius.

[0018] Preferably, an annular step is provided at the lower end of the shaft rod, the outer diameter of the annular step is larger than the inner wall radius of the outer cylinder, and the annular step limits the axial position of the shaft rod.

[0019] Preferably, the angle between the high point and the low point of the spiral groove is 180 degrees.

[0020] Preferably, both ends of the pin are provided with limiting blocks integrally formed with the pin, and the two limiting blocks limit the pin laterally.

[0021] (3) Beneficial effects

[0022] The utility model provides a spiral scraper type downhole wax scraping tool, which can be realized by connecting a weighted rod to the upper end of an outer cylinder, lowering the connected tool into the well through a wire rope, and when encountering wax scale obstruction, the shaft is subjected to an upward force under the obstruction of the wax scale, so that the pin drives the shaft to move along the low point to the high point of the spiral groove. During the movement, the spiral shaft at the lowest end of the tool rotates, and the wax scale is scraped by a plurality of spiral scrapers provided on the outer wall of the spiral shaft.

[0023] The return spring is installed between the inside of the outer tube and the shaft rod, and the elastic force of the return spring provides power for the rotation of the shaft rod, ensuring that the shaft rod can be reset after each scraping of wax stains, so that the tool forms a reciprocating scraping process during the lifting and lowering process, thereby achieving the purpose of efficiently removing wax stains in the well, keeping the well channel unobstructed, and improving the production efficiency of the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model shows a schematic structural diagram of a spiral scraper type downhole wax scraping tool;

[0025] Figure 2 A schematic cross-sectional view of a spiral scraper downhole wax scraping tool according to the present invention is shown;

[0026] Figure 3 The utility model shows a schematic diagram of the outer cylinder structure of a spiral scraper type downhole wax scraping tool.

[0027] Among them: 1: outer cylinder; 2: pin; 3: shaft; 4: spiral scraper; 5: return spring; 6: spiral shaft. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.

[0030] like Figure 1-3 As shown, the utility model provides a spiral scraper type downhole wax scraping tool, comprising: an outer cylinder 1 and a shaft 3;

[0031] like Figure 3 As shown, the outer cylinder 1 is composed of two parts. The upper end of the outer cylinder 1 is a cylindrical structure. The outer wall of the cylindrical structure at the upper end of the outer cylinder 1 is provided with a thread. The thread is used to install a weight rod to increase the lowering force and stability of the tool, so that the tool can be more stable during the lowering process to ensure the safety and effectiveness of the operation. The lower end of the outer cylinder 1 is a hollow cylindrical structure. The hollow structure provides an installation space for internal components. The outer wall of the lower end of the outer cylinder 1 is provided with two opposite spiral grooves. The groove depth of the two spiral grooves penetrates the outer wall of the outer cylinder 1. The angle between the high point and the low point of the spiral groove is 180 degrees. When the shaft rod 3 is blocked by wax stains, it can move from the low point to the high point along the spiral groove through the pin 2, thereby realizing the rotation of the spiral shaft rod 6;

[0032] like Figure 2As shown, a shaft rod 3 is embedded in the hollow structure at the lower end of the outer cylinder 1. A through hole is provided on the side wall of the upper end of the shaft rod 3. A pin 2 is provided in the through hole. The pin 2 passes through the upper part of the shaft rod 3 and is fixed. The two ends of the pin 2 extend from two spiral grooves provided on the outer wall of the outer cylinder 1. The two ends of the pin 2 are respectively provided with a limit block made integral with the pin 2. The two limit blocks limit the pin 2 in the lateral direction to prevent the pin 2 from lateral displacement during operation.

[0033] The lower end of the shaft rod 3 is provided with a spiral shaft rod 6, and the shaft rod 3 and the spiral shaft rod 6 are made into an integral structure. The radius of the shaft rod 3 is larger than the radius of the spiral shaft rod 6. The lower end of the shaft rod 3 is provided with an annular step, and the outer diameter of the annular step is larger than the inner wall radius of the outer cylinder 1. The annular step limits the axial position of the shaft rod 3, controls the movement distance of the shaft rod 3 during the scraping work, and avoids excessive compression of the return spring 5. The upper end of the shaft rod 3 is provided with a return spring 5, which is embedded in the lower end of the outer cylinder 1. The return spring 5 and the shaft rod 3 are made into one body. When the tool is not working, the return spring 5 helps the shaft rod 3 to return to its initial position, ensuring that the tool can reciprocate normally when it is used next time. The outer wall radius of the shaft rod 3 is smaller than the inner wall radius of the outer cylinder 1, ensuring that the shaft rod 3 can move axially in the outer cylinder 1;

[0034] The outer wall of the spiral shaft 6 is evenly provided with a plurality of spiral scrapers 4 around the circumference. The spiral scraper 4 is a steel curved scraper. The steel curved scraper has high hardness and wear resistance. The curved spiral scraper 4 can better fit the inner wall of the pipe string, ensuring high efficiency and thoroughness during the scraping process. The spiral scraper 4 is vertically installed on the spiral shaft 6. The spiral scraper 4 is equidistantly installed around the spiral shaft 6, with one piece installed at an interval of 120 degrees, for a total of 3 pieces. The evenly distributed design can ensure that all parts of the inner wall of the pipe string can be effectively cleaned during the rotation of the tool. The coordinated work of multiple spiral scrapers 4 can significantly improve the cleaning effect of wax scale. Since the spiral scraper 4 is a curved steel structure, the wax scale scraping surface on the inner wall of the pipe string is larger, ensuring that the cleaning area of ​​the pipe string section is larger each time the tool is lowered and lifted, improving the cleaning efficiency. The tool can clean a larger area of ​​the pipe string section each time it is lowered and lifted, and the cleaning effect is obvious.

[0035] The following is a detailed introduction to the actual working scenario of a spiral scraper downhole wax scraping tool.

[0036] The working process of the spiral scraper type downhole wax scraping tool includes the following steps:

[0037] Step S1: Preparation: Assemble the spiral scraper downhole wax scraper tool and install a weighted rod on the upper end of the outer cylinder 1 to increase the lowering force and stability of the tool. Check whether all parts of the tool are intact, especially whether the spiral scraper 4 is firmly installed on the spiral shaft 6.

[0038] Step S2: Lowering the tool. The tool is lowered through the wellhead equipment to the area with the most wax accumulation. During the lowering process, the weighting rod increases the weight of the tool so that it can reach the specified depth smoothly.

[0039] Step S3 begins scraping wax. When the tool reaches the wax deposit area, the shaft 3 encounters the wax deposit as an obstacle. Under the thrust of the wax deposit, the pin 2 moves from a low point to a high point along the spiral groove at the lower end of the outer cylinder 1. Due to the design of the spiral groove, the movement of the pin 2 drives the shaft 3 to rotate. The rotation of the shaft 3 drives the spiral shaft 6 and the spiral scraper 4 thereon to scrape the wax deposit on the well wall.

[0040] In step S4, during the wax scraping process, the spiral scraper 4 scrapes the wax deposits on the inner wall of the pipe string during rotation. Since the spiral scraper 4 is a curved steel structure, the scraping surface of the wax deposits on the inner wall of the pipe string is large, ensuring that a large area of ​​the pipe string section is cleaned each time the tool is lowered and raised. The coordinated work of multiple spiral scrapers 4 can significantly improve the wax deposit cleaning effect;

[0041] Step S5 returns and repeats the operation. During the wax scraping process, the return spring 5 provides a certain rebound force. After the pin 2 moves to the highest point, the tool is lifted as a whole. When the tool is lifted, the resistance of the wax stains disappears, and the compressed return spring 5 will rebound, pushing the shaft 3 back to the initial position, so that the tool can quickly return to its initial state, so that repeated wax scraping operations can be performed to effectively remove the wax stains in the well.

[0042] It can be understood that the above-mentioned embodiments mentioned in the present invention can be combined with each other to form combined embodiments without violating the principle logic. Due to space limitations, the present invention will not elaborate on them.

[0043] Those skilled in the art will understand that in the above-mentioned method of the specific implementation method, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0044] The utility model provides a spiral scraper type downhole wax scraping tool. A weighted rod is connected to the upper end of an outer cylinder 1. The connected tool is lowered into the well via a wire rope. When the tool encounters wax scale, the shaft is subjected to an upward force under the obstruction of the wax scale, so that the pin 2 drives the shaft 3 to move along the low point of the spiral groove to the high point. During the movement, the spiral shaft 6 at the lower end of the tool rotates, and the wax scale is scraped by a plurality of spiral scrapers 4 provided on the outer wall of the spiral shaft 6.

[0045] The return spring 5 is installed between the inside of the outer tube 1 and the shaft 3. The elastic force of the return spring 5 provides power for the rotation of the shaft 3, ensuring that the shaft 3 can be reset after each scraping of wax stains, so that the tool forms a reciprocating scraping process during the lifting and lowering process, thereby achieving the purpose of efficiently removing wax stains in the well, keeping the channel in the well unobstructed, and improving the production efficiency of the well.

[0046] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A spiral scraper type downhole wax scraping tool, characterized in that: include: An outer cylinder (1) and a shaft (3); The outer cylinder (1) is composed of two parts, the upper end of the outer cylinder (1) is a cylindrical structure, the lower end of the outer cylinder (1) is a hollow cylindrical structure, and the outer wall of the lower end of the outer cylinder (1) is provided with two opposite spiral grooves; The groove depth of the two spiral grooves penetrates the outer wall of the outer cylinder (1); A shaft (3) is embedded in the lower end of the outer cylinder (1), and a through hole is provided at the upper end of the shaft (3), wherein a pin (2) is provided in the through hole; The two ends of the pin (2) respectively pass through two spiral grooves provided on the outer wall of the outer cylinder (1), and the lower end of the shaft (3) is provided with a spiral shaft (6); The upper end of the shaft (3) is provided with a return spring (5), and the return spring (5) is embedded in the lower end of the outer cylinder (1); A plurality of spiral scrapers (4) are evenly arranged on the outer wall of the spiral shaft (6) in a circumferential direction.

2. The spiral scraper type downhole wax scraping tool according to claim 1, characterized in that: The return spring (5) and the shaft (3) are formed as a whole, and the outer wall radius of the shaft (3) is smaller than the inner wall radius of the outer cylinder (1).

3. The spiral scraper type downhole wax scraping tool according to claim 1, characterized in that: The spiral scraper (4) is a curved steel scraper, and the spiral scraper (4) is vertically mounted on the spiral shaft (6).

4. The spiral scraper type downhole wax scraping tool according to claim 1, characterized in that: The outer wall of the cylindrical structure at the upper end of the outer cylinder (1) is provided with threads.

5. The spiral scraper type downhole wax scraping tool according to claim 1, characterized in that: The shaft (3) and the spiral shaft (6) are made into one piece, and the radius of the shaft (3) is greater than the radius of the spiral shaft (6).

6. The spiral scraper type downhole wax scraping tool according to claim 5, characterized in that: An annular step is provided at the lower end of the shaft rod (3), the outer diameter of the annular step being larger than the inner wall radius of the outer cylinder (1), and the annular step limits the axial position of the shaft rod (3).

7. The spiral scraper type downhole wax scraping tool according to claim 1, characterized in that: The angle between the high point and the low point of the spiral groove is 180 degrees.

8. The spiral scraper type downhole wax scraping tool according to claim 1, characterized in that: Both ends of the pin (2) are provided with limiting blocks formed integrally with the pin (2), and the two limiting blocks limit the pin (2) in the lateral direction.

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