Drill rod fishing tool

Abstract

The utility model discloses a drill rod fishing tool, which is used for fishing a broken drill rod and comprises a joint, the inner cone is connected with the connector and is of a cylindrical body structure; the inner cone can rotate around a fixed point of the joint I; the guide sleeve is connected with the inner cone and is of a columnar structure; the guide sleeve can rotate along with the inner cone; a conical inner hole is formed in the inner cone in the axis direction of the inner cone, and the hole diameter of the conical inner hole is sequentially increased in the direction from the connector to the guide sleeve. The maximum hole diameter of the conical inner hole is larger than the outer diameter of the broken drill rod; the inner diameter of the guide sleeve is larger than the outer diameter of the broken drill rod. The fishing tool is simple in structure and suitable for fishing under special conditions, for example, a broken drill rod is in an inclined state.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration technology, specifically to a drill pipe retrieval tool. Background Technology

[0002] In actual engineering geological exploration drilling, due to complex geological conditions, especially when encountering fractured geological layers, drill bits often get stuck. Since drill rods are connected in series, broken drill rods often fall together with the drill bit into the deep hole, making them impossible to retrieve and rendering the borehole and drilling tools unusable. To avoid losses, timely retrieval of the drill rods that have fallen into the hole is a necessary task for drilling personnel.

[0003] Existing drill pipe retrieval tools are generally suitable for situations where the broken drill pipe is in a vertical position. However, the conditions inside the borehole are complex, such as collapses, debris, and fragments, which can cause the broken drill pipe to be in an inclined position. Existing drill pipe retrieval tools are inadequate in these situations. Therefore, there is an urgent need to improve existing retrieval devices to meet the requirements of retrieval under special conditions, such as when the broken drill pipe is inclined. Utility Model Content

[0004] The purpose of this utility model is to provide a drill pipe retrieval tool to overcome the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a drill rod retrieval tool for retrieving broken drill rods, characterized by comprising: a connector; an inner cone connected to the connector, the inner cone being a cylindrical structure; the inner cone being capable of rotating around a fixed point of the connector; a guide sleeve connected to the inner cone, the guide sleeve being a cylindrical structure; the guide sleeve being capable of rotating with the inner cone; the inner cone having a conical inner hole along its axial direction, the diameter of the conical inner hole increasing sequentially from the connector to the guide sleeve; the maximum diameter of the conical inner hole being larger than the outer diameter of the broken drill rod; and the inner diameter of the guide sleeve being larger than the outer diameter of the broken drill rod.

[0006] In some possible implementations, the drill pipe retrieval tool further includes a sphere disposed between the connector and the inner cone to enable the inner cone to rotate about a fixed point on the connector.

[0007] In this embodiment, the sphere comprises: a ball head connected to the connector; and a connecting rod, one end of which is connected to the ball head and the other end of which is connected to the inner cone.

[0008] In this embodiment, the connector includes: a connecting portion; a stepped portion connected to the connecting portion; the outer diameter of the connecting portion is smaller than the outer diameter of the stepped portion; the connecting portion and the stepped portion are provided with a groove for accommodating the ball; and the connecting rod passes through the stepped portion.

[0009] In some possible implementations, the drill pipe retrieval tool also includes a reducer that is fitted onto the connecting portion and abuts against the stepped portion.

[0010] In this embodiment, the end of the reducer furthest from the joint is provided with an internal thread structure.

[0011] In this embodiment, the inner cone includes: a pointed head connected to the connecting rod; a body connected to the pointed head; a tail connected to the body, and a guide sleeve fitted onto the tail; the inner cone hole extends from the tail to the connection between the body and the pointed head.

[0012] In this embodiment, the inner wall of the inner cone is provided with a plurality of grooves, which are evenly distributed along the inner wall of the inner cone.

[0013] In this embodiment, the guide sleeve includes: a fixing part, sleeved on the tail; and a catching part, connected to the fixing part; the outer diameter of the fixing part and the catching part are the same; the catching part is spiral-shaped; the inner hole of the catching part is correspondingly provided with the inner conical inner hole, and the center line of the inner hole and the conical inner hole coincides.

[0014] In this embodiment, the outer diameter of the fixing part is the same as the outer diameter of the body.

[0015] Compared with the prior art, the drill rod retrieval tool of this utility model has the following advantages: by setting a ball and a guide sleeve, the guide sleeve can rotate, which is convenient for capturing broken drill rods; through the inner cone hole and groove of the inner cone, it is convenient to tightly engage with the outer diameter of the broken drill rod. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a drill pipe retrieval tool according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the overall structure of the inner cone;

[0018] Figure 3 This is a schematic diagram showing the connection relationship between the sphere and the connector;

[0019] Figure 4 This is a schematic diagram of the overall structure of the guide sleeve. Detailed Implementation

[0020] Embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different examples, all of which do not depart from the scope of this utility model, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit this utility model.

[0021] It should be understood that although the terms "first," "second," etc., may be used herein to describe various features, these features should not be limited by these terms. The use of these terms is merely for distinction and should not be construed as indicating or implying relative importance. For example, without departing from the scope of the exemplary embodiments, a first feature may be referred to as a second feature, and similarly, a second feature may be referred to as a first feature.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or a connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the accompanying drawings and specific circumstances.

[0023] This application provides a drill pipe retrieval tool for retrieving broken drill pipes. Figure 1 This is a schematic diagram of the overall structure of a drill pipe retrieval tool according to an embodiment of this application; Figure 2 This is a schematic diagram of the overall structure of the inner cone, as shown below. Figure 1 and combined Figure 2 As shown, the drill pipe retrieval tool includes: a connector 100; an inner cone 200 connected to the connector 100, the inner cone 200 having a cylindrical structure; the inner cone 200 being able to rotate around a fixed point of the connector 100; a guide sleeve 300 connected to the inner cone 200, the guide sleeve 300 having a cylindrical structure; the guide sleeve 300 being able to rotate with the inner cone 200; the inner cone 200 having a tapered inner hole 201 along its axis, the diameter of the tapered inner hole 201 increasing sequentially from the connector 100 to the guide sleeve 200; the maximum diameter of the tapered inner hole 201 being larger than the outer diameter of the broken drill pipe (not shown in the figure); and the inner diameter of the guide sleeve 300 being larger than the outer diameter of the broken drill pipe.

[0024] In other embodiments of this application, such as Figure 3 As shown, the drill pipe retrieval tool also includes a sphere 400, which is positioned between the connector 100 and the inner cone 200 to enable the inner cone 200 to rotate around a fixed point of the connector 100.

[0025] In the above embodiments, such as Figure 3 As shown, the sphere 400 includes: a ball head 401, which is connected to the connector 100; and a connecting rod 402, one end of which is connected to the ball head 401 and the other end of which is connected to the inner cone 200.

[0026] In the above embodiments, such as Figure 3 As shown, the connector 100 includes: a connecting portion 101; a stepped portion 102 connected to the connecting portion 101; the outer diameter of the connecting portion 101 is smaller than the outer diameter of the stepped portion 102; the connecting portion 101 and the stepped portion 102 are provided with a groove 103 for accommodating a ball 401; and the connecting rod 402 passes through the stepped portion 102.

[0027] In other embodiments of this application, such as Figure 1 As shown, the drill pipe retrieval tool also includes a reducing diameter 500, which is sleeved on the connecting part 101 and abuts against the stepped part 102.

[0028] In the above embodiments, preferably, the reducing diameter 500 is threadedly connected to the connecting portion 101. Specifically, the reducing diameter 500 is provided with an internal thread structure, and the connecting portion 101 is provided with an external thread structure.

[0029] In the above embodiment, the end of the reducer 500 away from the connector 100 is provided with an internal thread structure to facilitate connection with the drill pipe.

[0030] In the above embodiment, the outer diameter of the stepped portion 102 is the same as the outer diameter of the variable diameter 500.

[0031] In the above embodiments, such as Figure 2 As shown, the inner cone 200 includes: a pointed head 202 connected to the connecting rod 402; a body 203 connected to the pointed head 202; a tail 204 connected to the body 203; a guide sleeve 300 sleeved on the tail 204; and an inner cone hole 201 extending from the tail 204 to the connection between the body 203 and the pointed head 202.

[0032] In the above embodiments, preferably, the pointed head 202 is threadedly connected to the connecting rod 402. Specifically, the pointed head 202 is provided with an internal thread structure, and the connecting rod 402 is provided with an external thread structure.

[0033] In the above embodiments, such as Figure 2 As shown, the inner wall of the inner cone 200 is provided with a number of grooves 205, and the grooves 205 are evenly distributed along the inner wall of the inner cone 200.

[0034] In the above embodiments, such as Figure 4 As shown, the guide sleeve 300 includes: a fixing part 301, which is sleeved on the tail part 204; a catching part 302, which is connected to the fixing part 301; the outer diameters of the fixing part 301 and the catching part 302 are the same; the catching part 302 is spiral; the inner hole 303 of the catching part 302 is correspondingly provided with the conical inner hole 201, and the axis of the inner hole 303 coincides with that of the conical inner hole 201.

[0035] In the above embodiments, preferably, the fixing part 301 is threadedly connected to the tail part 204. Specifically, the fixing part 301 is provided with an internal thread structure, and the tail part 204 is provided with an external thread structure.

[0036] Specifically, the fishing section 302 is a type of spring structure that can extend and retract when rotating.

[0037] In the above embodiment, the outer diameter of the fixing part 301 is the same as the outer diameter of the body 203.

[0038] The working principle of this utility model is as follows: When it is necessary to retrieve a broken drill rod, the drill rod retrieval tool is lowered. The guide sleeve 300 rotates under the drive of the inner cone. The retrieval part 302 captures the outer diameter of the broken drill rod. When it engages with the broken drill rod, the rotation stops, the drill rod retrieval tool is lowered, and the conical inner hole 201 of the inner cone 200 is locked with the broken drill rod. The drill rod retrieval tool is then pulled up, and the broken drill rod is lifted. Workers can determine whether the broken drill rod has been lifted by observing the pressure gauge reading on the ground. If the broken drill rod falls, the above steps can be repeated until the retrieval is completed.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A drill pipe retrieval tool for retrieving broken drill pipes, characterized in that, The drill pipe retrieval tool includes: Connector; An inner cone, connected to the connector, wherein the inner cone has a columnar structure; The inner cone can rotate around a fixed point of the connector; A guide sleeve is connected to the inner cone, and the guide sleeve has a columnar structure. The guide sleeve can rotate with the inner cone; The inner cone has a tapered inner hole along its axis, and the diameter of the tapered inner hole increases sequentially from the connector guide sleeve direction. The maximum diameter of the conical inner hole is greater than the outer diameter of the broken drill rod; The inner diameter of the guide sleeve is larger than the outer diameter of the broken drill pipe.

2. The drill pipe retrieval tool as described in claim 1, characterized in that, It also includes a sphere disposed between the connector and the inner cone to enable the inner cone to rotate around a fixed point of the connector.

3. The drill pipe retrieval tool as described in claim 2, characterized in that, The sphere comprises: The ball head is connected to the connector; The connecting rod is connected at one end to the ball head and at the other end to the inner cone.

4. The drill pipe retrieval tool as described in claim 3, characterized in that, The connector includes: Connecting part; The stepped portion is connected to the connecting portion; The outer diameter of the connecting part is smaller than the outer diameter of the stepped part; The connecting portion and the stepped portion are provided with a groove to accommodate the sphere; The connecting rod passes through the stepped portion.

5. The drill pipe retrieval tool as described in claim 4, characterized in that, It also includes a reducing diameter, which is fitted onto the connecting portion and abuts against the stepped portion.

6. The drill pipe retrieval tool as described in claim 5, characterized in that, The end of the reducer furthest from the joint is provided with an internal thread structure.

7. The drill pipe retrieval tool as described in claim 3, characterized in that, The inner cone comprises: The pointed head is connected to the connecting rod; The main body is connected to the pointed head; The tail section is connected to the body, and the guide sleeve is fitted onto the tail section. The tapered inner hole extends from the tail to the connection between the body and the pointed head.

8. The drill pipe retrieval tool as described in claim 1, characterized in that, The inner wall of the inner cone is provided with a number of grooves, which are evenly distributed along the inner wall of the inner cone.

9. The drill pipe retrieval tool as described in claim 7, characterized in that, The guide sleeve shown includes: The fixing part is sleeved on the tail; The fishing section is connected to the fixing section; The outer diameter of the fixing part is the same as that of the fishing part; The fishing section is spiral-shaped; The inner hole of the fishing section is correspondingly provided with the conical inner hole, and the center lines of the inner hole and the conical inner hole coincide.

10. The drill pipe retrieval tool as described in claim 9, characterized in that, The outer diameter of the fixing part is the same as the outer diameter of the body.

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