Novel variable-diameter anti-jamming coupling positioner for drill

Abstract

The utility model belongs to the technical field of oil and gas wells, and particularly relates to a novel variable-diameter anti-jamming coupling positioner which comprises a center rod, a shaft shoulder arranged at the upper end of the center rod, a first sleeve and a second sleeve which are sleeved on the center rod at intervals, the upper end of the first sleeve is in contact with the shaft shoulder, and a positioning claw is arranged between the first sleeve and the second sleeve. A bow-shaped spring is arranged between the inner wall of the positioning claw and the outer wall of the center rod, the two ends of the bow-shaped spring are connected with the positioning claw, the outer wall of the first sleeve is in threaded connection with a first limiting sleeve, the outer wall of the second sleeve is in threaded connection with a second limiting sleeve, a groove is formed in the position, close to the second sleeve, of the outer wall of the center rod, and the second sleeve is connected with the center rod through a shear pin. If the casing pipe deforms, the positioning claw cannot be retracted in time, so that the shear force is increased when the lifting tonnage is too large, the shear pin is cut off, the bow-shaped spring falls into the groove and loses support, and the positioning claw retracts, so that the positioner can pass through the deformed casing pipe, and the effect of preventing the drill from being stuck is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas well technology, specifically relating to a new type of variable diameter anti-sticking coupling positioner. Background Technology

[0002] In the exploration and development of resources such as oil and natural gas, drilling operations are a crucial step. During drilling, the coupling locator, as an important downhole tool, is used to determine the position of the casing coupling, thus providing accurate depth references for subsequent logging, cementing, and other operations. The coupling locator uses a spring to engage a locating claw in the gap between the two casing sections. This causes a certain tonnage fluctuation in the claw's position each time the tubing string is pulled up, and the depth is calibrated by comparing the depth of this fluctuation with the actual coupling depth. The locator remains firmly against the casing wall under the spring's action. If there are foreign objects in the casing or the casing is deformed, the locating claw may not retract in time, posing a risk of stuck pipe, damaging downhole tools, interrupting drilling operations, and other serious consequences, increasing operating costs and safety risks. Utility Model Content

[0003] Therefore, this utility model aims to solve the problem in the prior art that if there are foreign objects in the casing or the casing is deformed, the positioning claw cannot retract in time, which will lead to the risk of the drill getting stuck.

[0004] Therefore, the technical solution adopted is a novel variable-diameter anti-jamming coupling positioner of this utility model, comprising: a central rod, a shoulder provided at the upper end of the central rod, a first sleeve and a second sleeve sleeved at intervals on the central rod, the upper end of the first sleeve contacting the shoulder, a positioning grab provided between the first sleeve and the second sleeve, an arc-shaped spring provided between the inner wall of the positioning grab and the outer wall of the central rod, the two ends of the arc-shaped spring being connected to the positioning grab, a first limiting sleeve threadedly connected to the outer wall of the first sleeve, a second limiting sleeve threadedly connected to the outer wall of the second sleeve, a groove provided on the outer wall of the central rod near the second sleeve, and the second sleeve being connected to the central rod by a shear pin.

[0005] Preferably, the lower end of the first limiting sleeve is provided with a first slot, the upper end of the positioning grabber is installed in the first slot, the upper end of the second limiting sleeve is provided with a second slot, and the lower end of the positioning grabber is installed in the second slot.

[0006] Preferably, both the outer walls of the first and second limiting sleeves are provided with anti-slip textures.

[0007] Preferably, a liquid channel is provided through the center rod.

[0008] Preferably, the positioning gripper has a protrusion on its outer wall.

[0009] Preferably, multiple shear pins are provided circumferentially on the outer wall of the second sleeve.

[0010] The advantages of this utility model are as follows: If the casing deforms during the lifting process of the locator inside the casing, and the locating claw cannot retract in time, resulting in excessive lifting tonnage, simply continue lifting. The shear force increases until the shear pin is cut off, the bow spring falls into the groove, the bow spring loses its support, the locating claw retracts, the equivalent radius becomes smaller, and the locator can pass through the deformed casing, thus preventing stuck drill bit, improving drilling efficiency, and ensuring operational safety.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0012] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a half-sectional structural diagram of the present invention;

[0016] Among them, 1. center rod; 2. shoulder; 3. first sleeve; 4. second sleeve; 5. positioning gripper; 6. bow spring; 7. first limiting sleeve; 8. second limiting sleeve; 9. groove; 10. shear pin; 11. first slot; 12. second slot; 13. liquid channel. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] This utility model provides a novel variable-diameter anti-jamming coupling positioner, such as... Figure 1-2 As shown, it includes: a central rod 1, a shoulder 2 at the upper end of the central rod 1, a first sleeve 3 and a second sleeve 4 spaced apart on the central rod 1, the upper end of the first sleeve 3 contacting the shoulder 2, a positioning grab 5 between the first sleeve 3 and the second sleeve 4, an arc-shaped spring 6 between the inner wall of the positioning grab 5 and the outer wall of the central rod 1, the two ends of the arc-shaped spring 6 being connected to the positioning grab 5, a first limiting sleeve 7 threadedly connected to the outer wall of the first sleeve 3, a second limiting sleeve 8 threadedly connected to the outer wall of the second sleeve 4, a groove 9 on the outer wall of the central rod 1 near the second sleeve 4, and the second sleeve 4 being connected to the central rod 1 by a shear pin 10.

[0022] The lower end of the first limiting sleeve 7 is provided with a first slot 11, and the upper end of the positioning grab 5 is installed in the first slot 11. The upper end of the second limiting sleeve 8 is provided with a second slot 12, and the lower end of the positioning grab 5 is installed in the second slot 12, which can fix the positioning grab 5 more securely. The outer walls of both the first limiting sleeve 7 and the second limiting sleeve 8 are provided with anti-slip textures to increase friction and facilitate the rotation of the first limiting sleeve 7 and the second limiting sleeve 8. A liquid channel 13 is provided through the center rod 1 for water injection to clean the various components. The outer wall of the positioning grab 5 is provided with a boss, which can apply greater pressure to the inner wall of the sleeve, and the positioning grab can be more securely fixed to the inner wall of the sleeve. Multiple shear pins 10 are provided circumferentially on the outer wall of the second sleeve 4 to improve the stability of the connection.

[0023] The working principle and beneficial technical effects of the above technical solution are as follows: During the lifting process of the locator inside the casing, if the casing deforms and the locating claw 5 cannot retract in time, resulting in excessive lifting tonnage, it is only necessary to continue lifting, increasing the shear force until the shear pin 10 is cut off. The first casing 3, the first limiting sleeve 7, the locating claw 5, the bow spring 6, the second limiting sleeve 8, and the second casing 4 form a whole and move downward relative to the center rod 1. The bow spring 6 falls into the groove 9, loses its support, the locating claw 5 retracts, and the equivalent radius becomes smaller. The locator can then pass through the deformed casing, playing a role in preventing stuck drill bit, improving drilling efficiency, and ensuring operational safety.

[0024] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A novel variable-diameter anti-jamming coupling positioner, characterized in that, include: A central rod (1) is provided with a shoulder (2) at its upper end. A first sleeve (3) and a second sleeve (4) are sleeved on the central rod (1) at intervals. The upper end of the first sleeve (3) contacts the shoulder (2). A positioning grab (5) is provided between the first sleeve (3) and the second sleeve (4). A bow-shaped spring (6) is provided between the inner wall of the positioning grab (5) and the outer wall of the central rod (1). The two ends of the bow-shaped spring (6) are connected to the positioning grab (5). A first limiting sleeve (7) is threaded on the outer wall of the first sleeve (3). A second limiting sleeve (8) is threaded on the outer wall of the second sleeve (4). A groove (9) is provided on the outer wall of the central rod (1) near the second sleeve (4). The second sleeve (4) is connected to the central rod (1) by a shear pin (10).

2. The novel variable-diameter anti-jamming coupling positioner according to claim 1, characterized in that, The lower end of the first limiting sleeve (7) is provided with a first slot (11), and the upper end of the positioning grab (5) is installed in the first slot (11). The upper end of the second limiting sleeve (8) is provided with a second slot (12), and the lower end of the positioning grab (5) is installed in the second slot (12).

3. A novel variable-diameter anti-jamming coupling positioner according to claim 1, characterized in that, Anti-slip textures are provided on the outer walls of both the first limiting sleeve (7) and the second limiting sleeve (8).

4. A novel variable-diameter anti-jamming coupling positioner according to claim 1, characterized in that, A liquid channel (13) is provided through the center rod (1).

5. A novel variable-diameter anti-jamming coupling positioner according to claim 1, characterized in that, The positioning gripper (5) has a boss on its outer wall.

6. A novel variable-diameter anti-jamming coupling positioner according to claim 1, characterized in that, The second sleeve (4) has multiple shear pins (10) arranged circumferentially on its outer wall.

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