Wax scraping sampler
By designing a 90° distribution and limiting structure for the wax scraper sampler, the problem of tool string overshooting during downhole wax removal operations was solved, enabling the smooth lowering of the wax scraper and effective storage and discharge of wax, thus avoiding the risks of wire breakage and falling into the well.
Patent Information
- Application Number
- CN202520020410.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2035-01-03
AI Technical Summary
During downhole wax removal operations, the tool string is easily impacted, causing the wire to twist and break, resulting in the tool falling into the well and making it difficult to lower a conventional wax scraper.
Design a wax scraper sampler, including a central shaft, an upper wax scraper, a lower wax scraper, and a sampling box. The wax scrapers are distributed at 90° to form a wax discharge channel. The sampling box is used to store wax. The central shaft is provided with a limiting hole to prevent the wax scrapers from rotating. A straightening rod ensures that the position of the wax scrapers is stable.
The reduced stress surface of the wax scraper sampler in the well makes it easier to lower, increases the wax discharge channel, prevents the tool string from being pushed off the top, makes the steel wire less prone to breakage, and facilitates the storage and discharge of wax, thus preventing it from falling into the well.
Smart Images
Figure CN223482635U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wax scraper technology, and in particular relates to a wax scraper sampler. Background Technology
[0002] Downhole oil and gas typically contain paraffin wax. At deeper wells, due to higher temperatures and pressures, and a greater concentration of dissolved gases in the petroleum, paraffin wax is strongly dissolved and does not precipitate. However, as the well depth decreases, the temperature drops. When the temperature falls below the wax precipitation point, the wax originally dissolved in the oil and gas precipitates as crystals. As temperature and pressure continue to decrease, the crystallized paraffin wax forms crystals, primarily condensing on the inner wall of the tubing. If not cleaned promptly, this can easily cause tubing blockage, making subsequent repairs difficult. During downhole wax removal operations, conventional wax scrapers are difficult to lower, and the tool string is prone to overshooting, causing the wireline to twist, break, and the tool to fall into the well. Utility Model Content
[0003] In view of this, the present invention aims to propose a wax scraper sampler to solve the problem that the tool string is pushed off the surface during downhole wax removal operations, causing the steel wire to twist and break, resulting in the tool falling into the well.
[0004] To achieve the above objectives, the present technical solution is implemented as follows:
[0005] A wax scraper sampler includes a central shaft and an upper wax scraper, a first pressure ring, a lower wax scraper, a second pressure ring, and a sampling box that are sequentially sleeved on its outside. The upper and lower wax scrapers are distributed at 90° and form a wax discharge channel between them. The sampling box is used to store the wax scraped off from the well.
[0006] Furthermore, the upper and lower wax scrapers, and the first and second pressure rings, have the same structure but different dimensions.
[0007] Furthermore, the upper wax scraper has a symmetrical structure, including a scraper and a straightening rod. The scraper has a U-shaped structure with an arc-shaped outer surface. The scraper has a mounting hole in the middle, which is used to fit around the outside of the central shaft and is connected by a pressure ring. The scraper also has symmetrically positioned connecting holes, the two ends of which are used to install the two ends of the straightening rod.
[0008] Furthermore, the central shaft is provided with several limiting holes, which are used to pass through the straightening rod and are milled to fit and fix with the wax scraper mounting hole to prevent relative rotation and ensure that the wax scraper is distributed at 90°.
[0009] Furthermore, the straightening rod is a straight prism.
[0010] Furthermore, the straightening rod is a cuboid.
[0011] Furthermore, the cross-section of the scraper has a gradually thickened structure, with the thinnest part used for scraping wax.
[0012] Furthermore, the sampling box is an integral structure, including a box body and a connecting part. The box body is a cylindrical structure, and the upper part of the cylindrical wall is provided with several through holes. The inside of the cylindrical wall is used to store wax, and the connecting part is used to fix it to the central shaft.
[0013] Compared with the prior art, the wax scraper sampler of this utility model has the following advantages:
[0014] (1) The wax scraper of this utility model has an upper wax scraper and a lower wax scraper distributed at 90°. This reduces the stress surface of the wax scraper in the well, making it easier to lower the wax scraper. It also increases the wax discharge channel in the middle, making it easier to discharge the scraped wax. This effectively prevents the tool string connected to the wax scraper from being hit and causing the steel wire to twist and break, resulting in the tool falling into the well.
[0015] (2) The sampling box of the wax scraper described in this utility model serves to store wax without affecting the wax discharge of the overall structure. Attached Figure Description
[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0017] Figure 1 This is a schematic diagram of the wax scraper sampler described in an embodiment of the present invention;
[0018] Figure 2 This is a cross-sectional view of the wax scraper sampler described in an embodiment of the present invention;
[0019] Figure 3 This is a schematic diagram of the structure of the upper wax scraper described in an embodiment of the present invention;
[0020] Figure 4 This is a schematic diagram of the sampling box described in an embodiment of the present invention.
[0021] Explanation of reference numerals in the attached figures:
[0022] 1-Central shaft; 2-Upper wax scraper; 21-Scraper; 22-Mounting hole; 23-Straightening rod; 3-Lower wax scraper; 4-Sampling box; 41-Box body; 42-Connecting part; 5-First pressure ring; 6-Second pressure ring. Detailed Implementation
[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] A wax scraper, such as Figures 1 to 4 As shown, it includes a central shaft 1 and an upper wax scraper 2, a first pressure ring 5, a lower wax scraper 3, a second pressure ring 6, and a sampling box 4, which are sequentially sleeved on the outside. The upper wax scraper 2 and the lower wax scraper 3 are distributed at 90° and form a wax discharge channel between them. The sampling box 4 is used to store the wax scraped off the well.
[0028] The upper wax scraper 2 and the lower wax scraper 3 are distributed at 90°, which reduces the stress surface of the wax scraper sampler in the well, making it easier to lower the wax scraper sampler. It also increases the wax discharge channel in the middle, making it easier to discharge the scraped wax. This effectively prevents the tool string connected to the wax scraper sampler from being impacted, causing the steel wire to twist and break, which would cause the wax scraper sampler to fall into the well. The sampling box 4 connected at the lower end can store the scraped wax, making it convenient to bring the wax to the surface for testing.
[0029] Preferably, in order to reduce production costs, the upper wax scraper 2 and the lower wax scraper 3, the first pressure ring 5 and the second pressure ring 6 are all of the same structure but different in size.
[0030] The upper scraper 2 has a symmetrical structure, including a scraper 21, a mounting hole 22, and a straightening rod 23. The scraper 21 has a U-shaped structure with an arc-shaped outer surface. The scraper 21 has a mounting hole 22 in the middle, which is used to fit onto the outside of the central shaft 1. It is fixed by milling the outer square part to prevent relative rotation and ensure that the scraper is distributed at 90°. It is also connected by pressing with a pressure ring 5. The scraper 21 also has symmetrically positioned connecting holes, and the two ends of the connecting holes are used to install the two ends of the straightening rod 23.
[0031] In one embodiment, the central shaft 1 is provided with several limiting holes for the straightening rod 23 to pass through, thereby fixing the upper wax scraper 2. When the upper wax scraper 2 and the lower wax scraper 3 are distributed at 90°, the arc surfaces of the two wax scrapers form a complete circle in the axial direction, ensuring that the wax in the wellbore can be scraped off, and that the position of the two wax scrapers will not rotate due to external factors during the well-drilling process.
[0032] Preferably, the straightening rod 23 is a right prism, and more preferably a cuboid. This facilitates positioning.
[0033] The cross-section of the scraper 21 has a gradually thickened structure, with the thinnest part used for scraping wax so that the wax can be scraped off quickly.
[0034] The sampling box 4 is an integral structure, including a box body 41 and a connecting part 42. The box body 41 is a cylindrical structure with several through holes in the upper part of the cylindrical wall. The interior of the cylindrical wall is used to store wax. The connecting part 42 is used to fix it to the central shaft 1 with screws. This structure of the box body 41 allows some wax to flow out from the through holes when the sampling box 4 is lowered into the well along with the wax scraper, leaving only the solidified wax that has settled to be brought to the surface for testing. This serves the purpose of storing wax without affecting the wax discharge of the overall structure.
[0035] The working principle of a wax scraper is as follows:
[0036] The central shaft 1 is fitted with upper and lower wax scraping blades 2 and 3, which are distributed at 90°. After installation, the first pressure ring 5 and the second pressure ring 6 are tightened respectively. The scraping blades 22 of the upper and lower wax scraping blades 2 and 3 are inserted into the straightening rod 23, welded and ground smooth. The sampling box 4 is connected to the central shaft 6 and tightened, and the set screws are assembled. This structure reduces the force-bearing area when the wax scraping sampler is lowered into the well to scrape wax, increases the intermediate channel, and allows the scraped wax to be stored in the sampling box 4.
[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A wax scraping sampler, characterized in that: It includes a central shaft and an upper wax scraper, a first pressure ring, a lower wax scraper, a second pressure ring, and a sampling box that are sequentially fitted around it. The upper and lower wax scrapers are distributed at 90° and form a wax discharge channel between them. The sampling box is used to store the wax scraped off from the well.
2. The wax scraper sampler according to claim 1, characterized in that: The upper and lower wax scrapers, as well as the No. 1 and No. 2 pressure rings, have the same structure but different dimensions.
3. The wax scraper sampler according to claim 2, characterized in that: The upper scraper blade has a symmetrical structure, including a scraper blade and a straightening rod. The scraper blade has a U-shaped structure with an arc-shaped outer surface. The scraper blade has a mounting hole in the middle, which is used to fit onto the outside of the central shaft and is tightened by a pressure ring. The scraper blade also has symmetrically positioned connecting holes, the two ends of which are used to install the two ends of the straightening rod.
4. A wax scraper sampler according to claim 3, characterized in that: The central shaft is provided with several limiting holes, which are used to pass through the straightening rod and are milled to fit and fix the wax scraper mounting hole to prevent relative rotation and ensure that the wax scraper is distributed at 90°.
5. A wax scraper sampler according to claim 3, characterized in that: The straightening rod is a right prism.
6. A wax scraper sampler according to claim 5, characterized in that: The straightening pole is a cuboid.
7. A wax scraper sampler according to claim 3, characterized in that: The scraper blade has a gradually thickened cross-section, with the thinnest part used for scraping wax.
8. A wax scraper sampler according to claim 1, characterized in that: The sampling box is an integral structure, including a box body and a connecting part. The box body is a cylindrical structure, and the upper part of the cylindrical wall is provided with several through holes. The inside of the cylindrical wall is used to store wax, and the connecting part is used to fix it to the central shaft.