A scraping tool for removing a cement plug

Abstract

The utility model discloses a kind of abrasive scraping tools for oil field drilling cement plug clearance, it includes: cylindrical body, upper male thread of connecting screw rod drill is provided in one end of body, lower female thread is equipped on the inner wall of another end cylinder of body, a plurality of protruding wear-resistant material layers are provided along the length direction of body, through water channel is formed between adjacent two wear-resistant material layers.The abrasive scraping tool solves the problem that cement ring remaining in casing inner wall cannot be cleaned in plug drilling construction, when drilling cement plug construction, drill bit drills and mills cement plug to form passage, under the action of rotary torque, the casing inner wall remaining cement ring of clearance abrasive scraping tool is cleaned.

Description

Technical Field

[0001] This utility model relates to the field of well repair construction in oil and gas fields, and in particular to a grinding and scraping tool for cleaning cement plugs in oilfield drilling. Background Technology

[0002] Existing milling shoes are specialized tools used in oil drilling and well workover operations to remove downhole obstacles. They are mainly used in scenarios such as handling fallen debris (such as broken drill pipes, casings, etc.), casing repair, and well abandonment. Used in conjunction with milling tools, they ensure the smooth progress of subsequent operations.

[0003] Currently, during minor repair operations on oil, gas, and water wells in oilfields, it is necessary to drill out the cement plug inside the casing for extraction of the target layer or for plugging operations. This requires the insertion of roller cone or scraper bits for plug removal. During this process, due to the drill bit structure and the reaming trajectory of the screw drill, cement rings often remain on the inner wall of the casing, making it difficult to insert subsequent large-diameter tools. This necessitates the re-insertion of milling tools to clean the inner wall of the casing. This results in the problem of thoroughly cleaning the cement rings remaining on the inner wall of the casing. Utility Model Content

[0004] The purpose of this utility model is to provide a scraping tool for cleaning cement plugs in oilfield drilling, a professional tool for removing downhole obstacles, and cleaning the residual cement rings on the inner wall of the casing.

[0005] To achieve the purpose of this utility model, this utility model provides a grinding and scraping tool for cleaning cement plugs in oilfield drilling, which includes: a cylindrical body, an upper male thread at one end of the body, a lower female thread on the inner wall of the cylinder at the other end of the body, and multiple raised wear-resistant material layers along the length of the body, with a through water groove formed between two adjacent wear-resistant material layers.

[0006] In a further optimized design, the water channel and the wear-resistant material layer are evenly distributed on the outer circumferential surface of the body.

[0007] The design is further optimized so that the upper male thread, lower female thread and body are integrated into one structure.

[0008] In a further optimized design, the wear-resistant material layer is inlaid and welded onto the outer side of the body.

[0009] In a further optimized design, the outer contour of the upper male thread is frustum-shaped, the diameter of the end closer to the body is larger than that of the end farther away, and its maximum diameter is smaller than that of the body. The male thread is connected to the lower part of the screw drill and then to the drill bit.

[0010] Further optimization involves setting the two ends of the wear-resistant material layer shorter than the two ends of the main beam along the axial direction of the body, and using several conical surfaces for a smooth transition at the connection between the wear-resistant material layer and the main body. In a further optimized design, the wear-resistant material layer is made of an alloy.

[0011] Compared with existing technologies, this invention offers the following advantages: It provides a scraping tool for cleaning cement plugs in oilfield drilling. Multiple raised wear-resistant material layers are arranged along the length of the main body, which can remove dirt and cement rings from the inner wall of the casing. During cement plug drilling, the drill bit mills the cement plug to form a channel. Under the action of rotational torque, the scraping tool scrapes and cleans the residual cement rings on the inner wall of the casing. Drill cuttings and dirt are carried out of the wellbore through the water channel at the top of the main body by the circulating fluid, completing the drilling and casing cleaning in one tubing run. This reduces the labor intensity of workers and shortens the construction cycle. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the grinding and scraping tool for cleaning cement plugs in oilfield drilling according to this utility model; Figure 2 This is a half-section view and a right-side projection view of the grinding and scraping tool used for cleaning cement plugs in oilfield drilling according to this utility model.

[0013] 1 is the upper male thread, 2 is the body, 3 is the wear-resistant material layer, 4 is the water groove, and 5 is the lower female thread. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-2 As shown in the illustration, this utility model provides a scraping tool for cleaning cement plugs in oilfield drilling. It includes a cylindrical body 2 with an upper male thread 1 at one end, which connects to the lower part of a screw drill (a common tool in well workover operations) and then to a drill bit. A lower female thread 5 is provided on the inner wall of the cylinder at the other end of the body 2. Multiple raised wear-resistant material layers 3 are arranged along the length of the body 2, forming a through-flow groove 4 between adjacent wear-resistant material layers 3.

[0016] The design was further optimized by evenly distributing the water channel 4 and the wear-resistant material layer 3 on the outer circumferential surface of the body 2. The wear-resistant material is YD cemented carbide inlaid on the tool surface to scrape and clean dirt from the inner wall of the sleeve.

[0017] The design was further optimized so that the upper male thread 1, the lower female thread 5, and the body 2 are integrated into one structure.

[0018] The design was further optimized by welding the wear-resistant material layer 3 onto the outer side of the main body 2. The wear-resistant material layer 3 is made of YD hard alloy and is used to clean dirt from the inner wall of the casing.

[0019] Further optimization of the design: the outer contour of the upper male thread 1 is a frustum shape, the diameter of the end closer to the body 2 is larger than that of the end farther away, and its maximum diameter is smaller than that of the body 2.

[0020] Further optimization of the scheme: along the axis of the body 2, the two ends of the wear-resistant material layer 3 are shorter than the two ends of the beam of the body 2, and the connection between the wear-resistant material layer 3 and the body 2 is smoothed by several conical surfaces.

[0021] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A grinding and scraping tool for cleaning cement plugs in oilfield drilling, characterized in that, It includes: The cylindrical body (2) has an upper male thread (1) for connecting the screw drill at one end and a lower female thread (5) on the inner wall of the cylinder at the other end. Multiple raised wear-resistant material layers (3) are provided along the length of the body (2), and a through water channel (4) is formed between two adjacent wear-resistant material layers (3).

2. The grinding and scraping tool for cleaning cement plugs in oilfield drilling according to claim 1, characterized in that: The water channel (4) and the wear-resistant material layer (3) are evenly distributed on the outer circumferential surface of the body (2).

3. The grinding and scraping tool for cleaning cement plugs in oilfield drilling according to claim 1, characterized in that: The upper male thread (1), the lower female thread (5), and the body (2) are an integral structure.

4. The grinding and scraping tool for cleaning cement plugs in oilfield drilling according to claim 1, characterized in that: The wear-resistant material layer (3) is welded to the outside of the body (2).

5. The grinding and scraping tool for cleaning cement plugs in oilfield drilling according to claim 1, characterized in that: The outer contour of the upper male thread (1) is frustum-shaped. The diameter of the end closer to the body (2) is greater than that of the end further away. Its maximum diameter is smaller than that of the body (2). The male thread is connected to the lower part of the screw drill and then to the drill bit.

6. The grinding and scraping tool for cleaning cement plugs in oilfield drilling according to claim 1, characterized in that: Along the axial direction of the body (2), the two ends of the wear-resistant material layer (3) are shorter than the two ends of the beam of the body (2), and the connection between the wear-resistant material layer (3) and the body (2) is smoothed by several conical surfaces.

7. The grinding and scraping tool for cleaning cement plugs in oilfield drilling according to claim 6, characterized in that: The wear-resistant material layer is made of alloy.

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