Coiled tubing downhole tool for grinding fish head

Abstract

The utility model relates to a coiled tubing downhole tool for grinding a fish head. The coiled tubing downhole tool comprises a grinding shoe and a guiding shoe. The guiding shoe is fixedly arranged outside the milling shoe in a sleeving mode, the lower end of the guiding shoe extends to the position below the milling shoe, and therefore a cavity with an opening in the lower end can be formed below the milling shoe. The device has the advantages that irregular falling objects in a well can be ground so as to facilitate later salvage operation, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous oil tubing downhole tools, in particular to a continuous oil tubing downhole tool for grinding fish heads. Background Art

[0002] Fallen fish refers to the part of the drilling tool that falls or drops into the well during the handling process after an accident such as drill bit breakage or drill bit sticking occurs. The top of the fallen fish is called the fish head.

[0003] In the process of salvaging fallen fish, some fallen objects are irregular and difficult to salvage directly with a salvage tube, so sometimes it is necessary to grind the fish head before salvaging; but often some fallen objects will move in the well, and it is impossible to grind them directly with a grinding shoe.

[0004] Therefore, in view of the shortcomings of the prior art, a continuous tubing downhole tool for grinding fish heads is proposed, which can grind the irregular shapes of fallen objects in the well to facilitate the subsequent salvage operation. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a continuous oil tubing downhole tool for grinding fish heads. A guide shoe is added to the continuous oil tubing grinding shoe tool to achieve grinding of irregular shapes of fallen objects in the well, which is convenient for subsequent salvage operations, and has a simple structure and low cost.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A coiled tubing downhole tool for grinding fish heads, comprising a grinding shoe and a guide shoe; the guide shoe fixing sleeve is arranged outside the grinding shoe, and the lower end of the guide shoe extends to below the grinding shoe, so that a cavity with an open lower end can be formed below the grinding shoe;

[0008] The guide shoe comprises an upper sleeve section and a lower sleeve section which are sequentially connected up and down;

[0009] The grinding shoe is arranged below the rod-shaped main body, and the upper sleeve section is sleeved on the rod-shaped main body in a non-rotatable manner.

[0010] The outer diameter of the rod-shaped body is smaller than the outer diameter of the grinding shoe, and a plurality of scraping bodies are vertically arranged on the outer wall of the rod-shaped body;

[0011] The top of the upper sleeve section is provided with multiple groups of clips extending upwards, and the two clips of each group of clips can be correspondingly inserted between two adjacent scraping bodies to realize the clipping of the guide shoe and the rod-shaped body, ensuring that the guide shoe and the grinding shoe can rotate synchronously.

[0012] During the movement of the grinding shoe, the tool can put the fallen objects into the cavity formed by the guide shoe. The outer wall of the cavity rotates with the grinding shoe, so that the cavity can enclose the fallen objects, thereby preventing the fallen objects from moving in the well, and the grinding shoe can grind the fallen objects.

[0013] In a preferred embodiment of this solution, the lower end surface of the guide shoe is an inclined surface inclined upward toward the middle, which can facilitate falling objects to enter the cavity.

[0014] In a preferred embodiment of the present scheme, the guide shoe is cylindrical, and the grinding shoe is threadedly connected to the upper part of the inner cavity of the guide shoe.

[0015] In the coiled tubing downhole tool, the design of arranging a scraper on the outer wall of the rod-shaped body can avoid jamming when lifting the tubing string.

[0016] In a preferred embodiment of the present solution, the top of the clip strip is an inclined surface extending upward and inward to the outer surface of the rod-shaped body.

[0017] In a preferred embodiment of the present solution, the rod-shaped body is detachably connected to the grinding shoe, and the bottom of the upper sleeve section is threadedly connected or welded to the top of the lower sleeve section.

[0018] In a preferred embodiment of the present scheme, a sloped transition section is provided at the bottom of the upper sleeve section, and an inclined ring platform is provided on the outside of the sloped transition section; the upper end surface of the lower sleeve section is a slope extending upward and inward, and after assembly is completed, the upper end surface of the lower sleeve section can be docked with the inclined ring platform, and the upper end surface of the lower sleeve section can have the same inclination as the inclined ring platform.

[0019] It should be noted that when the tool of this solution is used, a combination of guide shoes and grinding shoes of different specifications and sizes can be selected according to the objects dropped in the well and the size of the wellbore, so as to achieve the purpose of grinding the fish head and facilitate the subsequent salvage operation.

[0020] The beneficial effects of the utility model are as follows: in a continuous oil tubing downhole tool for grinding fish heads, a guide shoe is added to the front section of the continuous oil tubing grinding shoe tool, and the lower end of the guide shoe extends to below the grinding shoe, thereby forming a cavity with an open lower end below the grinding shoe; during the movement of the grinding shoe, the cavity structure can put fallen objects into the guide shoe, and at the same time, the outer wall of the cavity rotates with the grinding shoe, so that the cavity can wrap around the fallen objects to prevent the movement of the fallen objects in the well, so that the grinding shoe can grind the fallen objects, thereby facilitating the later salvage operations, and the scheme has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of embodiments 3 to 5 of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of Embodiments 3 to 5 of the present utility model;

[0023] Figure 3 It is another structural schematic diagram of embodiments 3 to 5 of the present utility model;

[0024] Figure 4 This is a schematic diagram of a mill shoe installation when the coiled tubing downhole tool is not installed;

[0025] Figure 5 It is a structural schematic diagram of Example 1 or Example 2 of the utility model.

[0026] Among them: 1. grinding shoe; 2. guide shoe; 3. cavity; 4. rod-shaped body; 5. scraper; 6. clamping strip; 7. well wall; 201. upper sleeve section; 202. lower sleeve section; 2011. inclined transition section. DETAILED DESCRIPTION

[0027] The technical solution of the present utility model is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0028] Example 1

[0029] refer to Figure 4 , Figure 5 As shown, a continuous tubing downhole tool for grinding fish heads is provided. The tool is achieved by adding a guide shoe 2 to the front section of the continuous tubing grinding shoe tool to grind irregular shapes of fallen objects in the well, thereby facilitating subsequent salvage operations. The grinding shoe 1 is a flat-bottomed grinding shoe, and a cavity 3 with an opening at the lower end is formed between the grinding head at the bottom of the grinding shoe 1 and the inner wall of the guide shoe 2.

[0030] Furthermore, in this solution, the guide shoe 2 is fixedly sleeved on the outside of the mill shoe 1, and the mill shoe 1 is connected to the upper part of the inner cavity of the guide shoe 2 by welding.

[0031] In this embodiment, the lower end surface of the guide shoe 2 is an inclined surface inclined upward in the middle; there is a gap between the outer surface of the guide shoe 2 and the well wall 7.

[0032] Example 2

[0033] The only difference between this embodiment and the first embodiment is that the connection between the grinding shoe 1 and the upper part of the inner cavity of the guide shoe 2 is a threaded connection.

[0034] Example 3

[0035] refer to Figure 1 ,as well as Figure 3 or Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the specific structure of the guide shoe 2 and the fixing method of the guide shoe 2 are different from those in embodiment 1.

[0036] Specifically, in this embodiment, the guide shoe 2 includes an upper sleeve section 201 and a lower sleeve section 202 connected up and down; the grinding shoe 1 is detachably arranged below the rod-shaped body 4, and the upper sleeve section 201 is non-rotatably sleeved on the rod-shaped body 4.

[0037] Furthermore, in this embodiment, the inner wall of the lower sleeve section 202 is in contact with the outer wall of the grinding shoe 1 , and the upper sleeve section 201 is connected to the rod-shaped body 4 by welding.

[0038] Example 4

[0039] The difference between this embodiment and the third embodiment is that the fixing method of the guide shoe 2 is different from that of the third embodiment, and in this embodiment, a plurality of groups of clamping strips 6 extending upward are further provided on the top of the upper sleeve section 201 .

[0040] Specifically, in this embodiment, the outer diameter of the rod-shaped main body 4 is smaller than the outer diameter of the grinding shoe 1, and a plurality of scraping bodies 5 are vertically arranged on the outer wall of the rod-shaped main body 4; the two clips 6 of each group of clips can be correspondingly inserted between two adjacent scraping bodies 5, so that this scheme can realize the clip-on installation of the guide shoe 2 and the rod-shaped main body 4, ensuring that the guide shoe 2 and the grinding shoe 1 can rotate synchronously without welding the guide shoe 2 and the grinding shoe 1, or welding the guide shoe 2 and the rod-shaped main body 4.

[0041] Furthermore, in this solution, the top of the clamping strip 6 is an inclined surface extending upward and inward to the outer surface of the rod-shaped body 4 .

[0042] In this embodiment, the bottom of the upper sleeve section 201 is welded to the top of the lower sleeve section 202; a bevel transition section 2011 is provided at the bottom of the upper sleeve section 201, and an inclined ring stage is provided outside the bevel transition section 2011; the upper end surface of the lower sleeve section 202 is a bevel extending upward and inward. After assembly, the upper end surface of the lower sleeve section 202 can be connected to the inclined ring stage, and the upper end surface of the lower sleeve section 202 can have the same inclination as the inclined ring stage.

[0043] Example 5

[0044] The only difference between this embodiment and Embodiment 4 is that the connection between the bottom of the upper sleeve section 201 and the top of the lower sleeve section 202 is a threaded connection.

[0045] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A coiled tubing downhole tool for grinding fish heads, characterized in that: It comprises a grinding shoe (1) and a guide shoe (2); The guide shoe (2) is fixedly sleeved on the outside of the mill shoe (1), and the lower end of the guide shoe (2) extends below the mill shoe (1), so that a cavity (3) with an open lower end can be formed below the mill shoe (1); The guide shoe (2) comprises an upper sleeve section (201) and a lower sleeve section (202) which are sequentially connected up and down; The grinding shoe (1) is arranged below the rod-shaped body (4), and the upper sleeve section (201) is sleeved on the rod-shaped body (4) in a non-rotatable manner. The outer diameter of the rod-shaped body (4) is smaller than the outer diameter of the grinding shoe (1), and a plurality of scraping bodies (5) are vertically arranged on the outer wall of the rod-shaped body (4); The top of the upper sleeve section (201) is provided with a plurality of groups of clip strips (6) extending upwards, and the two clip strips (6) of each group of clip strips can be correspondingly clipped between two adjacent scraping bodies (5).

2. A coiled tubing downhole tool for grinding fish heads according to claim 1, characterized in that: The lower end surface of the guide shoe (2) is an inclined surface inclined upward in the middle.

3. A coiled tubing downhole tool for grinding fish heads according to claim 2, characterized in that: The guide shoe (2) is cylindrical, and the grinding shoe (1) is threadedly connected to the upper part of the inner cavity of the guide shoe (2).

4. The coiled tubing downhole tool for grinding fish heads according to claim 1, characterized in that: The top of the clamping strip (6) is an inclined surface extending upward and inward to the outer surface of the rod-shaped body (4).

5. The coiled tubing downhole tool for grinding fish heads according to claim 1, characterized in that: The rod-shaped body (4) is detachably connected to the grinding shoe (1), and the bottom of the upper sleeve section (201) is threadedly connected or welded to the top of the lower sleeve section (202).

6. A coiled tubing downhole tool for grinding fish heads according to claim 5, characterized in that: The bottom of the upper sleeve section (201) is provided with an inclined transition section (2011), and the outside of the inclined transition section (2011) is provided with an inclined ring platform; The upper end surface of the lower sleeve section (202) is an inclined surface extending upward and inward. After assembly, the upper end surface of the lower sleeve section (202) can be butted against the inclined ring platform, and the upper end surface of the lower sleeve section (202) can have the same inclination as the inclined ring platform.

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