Anti-falling directional drilling rod with centralizer

Abstract

The utility model relates to the technical field of well drilling drill rod discloses a prevent slipping directional drill rod with centralizing, including drill rod body, centralizing subassembly, centralizing subassembly is sleeved in the outside of drill rod body, and centralizing subassembly includes ring seat and a plurality of centralizing blocks, and ring seat is rotatably connected with drill rod body, and a plurality of centralizing blocks are installed on ring seat through telescopic part, and a plurality of centralizing blocks evenly distribute along the circumferential side of ring seat, and a plurality of centralizing blocks abut with the inner wall of borehole and realize the centralizing orientation of drill rod body, prevent slipping subassembly, prevent slipping subassembly is installed on drill rod body, and adjacent drill rod body is connected through prevent slipping subassembly. Through adjustable centralizing subassembly realizes the accurate control of drill rod drilling track, and through prevent slipping subassembly ensures the reliability of drill rod connection, solves the technical problem of poor centralizing effect and easy tripping in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of drilling pipe technology, and more specifically, to a directional drill pipe with a centering function to prevent detachment. Background Technology

[0002] Directional drill pipe is a core component of directional drilling operations, requiring it to simultaneously meet the core requirements of directional guidance and stable, anti-disengagement drilling. Existing drill pipes mostly employ a fixed stabilizer ring structure, where the contact force between the stabilizer ring and the wellbore wall is not adjustable. If the contact is too loose, it cannot effectively resist the centrifugal force during drill pipe rotation and the axial deviation force during drilling, easily causing the drilling trajectory to deviate from the designed path. If the contact is too tight, it increases the frictional resistance between the drill pipe and the wellbore, not only consuming additional power but also accelerating stabilizer ring wear and shortening its service life. Furthermore, during directional drilling, the drill pipe must withstand complex torque, axial pressure, and radial impact forces. Traditional drill pipes rely solely on threaded connections, and the threaded mating surfaces are prone to gaps due to vibration. After long-term operation, thread wear can lead to joint disengagement, which can range from interrupting drilling operations to causing drill pipe falls into the well and other safety accidents.

[0003] Therefore, there is an urgent need for a directional drill pipe that combines adjustable alignment and reliable anti-dislodgement to adapt to the complex working conditions of directional drilling. Utility Model Content

[0004] The purpose of this invention is to provide a directional drill rod with a centering mechanism and anti-disengagement design. The adjustable centering component enables precise control of the drill rod's drilling trajectory, while the anti-disengagement component ensures the reliability of the drill rod connection, thus solving the technical problems of poor centering effect and easy disengagement in the prior art.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a directional drill pipe with a centering mechanism and anti-detachment feature, comprising: a drill pipe body; a centering assembly, wherein the centering assembly is sleeved on the outside of the drill pipe body, the centering assembly includes a ring seat and a plurality of centering blocks, the ring seat is rotatably connected to the drill pipe body, the plurality of centering blocks are installed on the ring seat through telescopic members, the plurality of centering blocks are evenly distributed along the circumference of the ring seat, and the plurality of centering blocks abut against the inner wall of the wellbore to achieve centering and orientation of the drill pipe body; and an anti-detachment assembly, wherein the anti-detachment assembly is installed on the drill pipe body, and adjacent drill pipe bodies are connected through the anti-detachment assembly.

[0006] According to the present invention, a directional drill rod with a centering function and anti-detachment features a bearing groove on the inner side wall of the ring seat and a bearing is installed on the outer side wall of the drill rod body. The ring seat and the drill rod body are rotatably connected through the bearing and the bearing groove.

[0007] According to the present invention, a directional drill rod with a straightening function and anti-detachment is provided, wherein a plurality of mounting grooves are provided on the outer wall of the ring seat, a telescopic component is installed in the mounting groove, and the straightening block is installed at the other end of the telescopic component.

[0008] According to the present invention, a directional drill rod with a straightening function is provided, wherein the telescopic component is an electro-hydraulic telescopic rod, one end of which is fixedly installed on the inner side wall of the mounting groove, and the other end is fixedly connected to the straightening block.

[0009] According to the present invention, a directional drill pipe with a centering block is provided, wherein the centering block has an arc-shaped structure, and the electro-hydraulic telescopic rod can make the centering block abut against the wellbore sidewall when extended.

[0010] According to the present invention, a directional drill rod with anti-dislodgement component is provided, wherein the anti-dislodgement component includes an external threaded connector, an internal threaded connector and a limiting member. The external threaded connector is fixedly connected to the top of the drill rod body, the internal threaded connector is located at the bottom of the drill rod body, the external threaded connector matches the internal threaded connector, and the limiting member is provided between adjacent external threaded connectors and internal threaded connectors, the limiting member enabling a stable connection between adjacent drill rod bodies.

[0011] According to the present invention, a directional drill rod with a centering function and anti-detachment features is provided. The limiting component includes a limiting block and a limiting groove. The limiting block is fixedly connected to the external threaded joint, and the limiting groove is opened at the internal threaded joint. The limiting block and the limiting groove are adapted to each other.

[0012] According to the present invention, a directional drill rod with a centering function and anti-detachment features is provided, wherein the limiting block has an umbrella-shaped structure and the limiting groove has an annular structure distributed on the side wall of the internal threaded joint.

[0013] The present invention discloses the following technical effects:

[0014] In this invention, a centering component is fitted onto the outside of the drill pipe body. During drilling, the angle at which the drill pipe descends can be adjusted to ensure that the drill pipe always descends vertically. Several centering blocks are evenly distributed around the annular seat. The contact force between different centering blocks and the wellbore sidewall is adjusted by telescopic components, thereby applying different guiding forces to the drill pipe body and adjusting the drilling direction. Anti-detachment components are installed between adjacent drill pipe bodies to make the connection between the drill pipe bodies more stable and avoid accidents such as drill pipe falling into the well. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of another structural state of the present invention;

[0018] Figure 3 This is a schematic diagram of the uprighting component in this utility model;

[0019] Figure 4 This is a schematic diagram of the internal threaded connector in this utility model;

[0020] The components include: 1. Drill rod body; 2. Ring seat; 3. Straightening block; 4. Electro-hydraulic telescopic rod; 5. Mounting groove; 6. Bearing groove; 7. External threaded joint; 8. Internal threaded joint; 9. Limiting block; 10. Limiting groove. Detailed Implementation

[0021] 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.

[0022] The following embodiments involve drill pipe, drill bit, and drive components that rotate the drill pipe. The drill pipe is a hollow cylindrical metal rod, typically made of high-strength alloy steel such as 35CrMo or 42CrMo, with a smooth inner wall to reduce drilling fluid flow resistance. Both ends are machined with API standard trapezoidal threads for end-to-end connection to form a drill string. The drill pipe receives torque and axial pressure from the surface drive components and transmits it to the drill bit. Internal through-holes serve as a drilling fluid circulation path, cooling the drill bit, carrying cuttings, and balancing formation pressure. Multiple drill pipes are connected in series to form a drill string hundreds to thousands of meters long, supporting the drill bit's working position within the wellbore.

[0023] Drill bits are the final execution tools for rock breaking. Common types include PDC drill bits, which are inlaid with polycrystalline diamond composite discs and are suitable for soft to medium-hard formations, breaking rock through rotary cutting; roller cone drill bits, which are equipped with rotating roller cones and have carbide teeth welded to their surface, suitable for hard formations, breaking rock through crushing impact; and core drill bits, which have a ring structure with a core channel in the center for geological sampling. They all have a female threaded connector at the top for mating with the male drill pipe connector, and the bottom features cutting teeth, roller cones, or water channels, depending on the type.

[0024] The drive unit is the power source for rotating the drill pipe. It is a hydraulic or electric drive device on the top of the derrick, and the spindle is directly connected to the top of the drill pipe string.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 4 As shown, this utility model provides a directional drill pipe with a centering mechanism and anti-detachment feature, comprising: a drill pipe body 1; a centering assembly, which is sleeved on the outside of the drill pipe body 1, the centering assembly including a ring seat 2 and a plurality of centering blocks 3, the ring seat 2 being rotatably connected to the drill pipe body 1, the plurality of centering blocks 3 being installed on the ring seat 2 through a telescopic component, the plurality of centering blocks 3 being evenly distributed along the circumference of the ring seat 2, and the plurality of centering blocks 3 abutting against the inner wall of the wellbore to achieve centering and orientation of the drill pipe body 1; and an anti-detachment assembly, which is installed on the drill pipe body 1, and adjacent drill pipe bodies 1 are connected through the anti-detachment assembly.

[0027] The drill pipe body 1 is a hollow cylindrical structure made of high-strength alloy steel. Its axis coincides with the center of the drill pipe. Its internal hollow channel is used to transport drilling fluid, realize the function of cooling the drill bit and carrying rock cuttings. The outer wall of the drill pipe body 1 is smooth, and the installation structure is only set in specific areas to ensure the connection with other components. The drill pipe body 1 at the end is connected to a spiral cutter, i.e., the drill bit, as the end drilling component. The drill pipe body 1 at the top is connected to a motor as the driving component. The connection method of the motor and the drill bit adopts existing technology, which will not be described in detail here.

[0028] The centering assembly is fitted onto the outer middle area of ​​the drill pipe body 1, specifically including a ring seat 2, a centering block 3, and a telescopic component. The ring seat 2 is circular, and its inner sidewall has a bearing groove 6. A bearing is installed in the bearing groove 6, and the bearing is rotatably connected to the outer sidewall of the drill pipe body 1. This design allows the ring seat 2 to rotate relative to the drill pipe body 1, reducing the friction and wear between the centering block 3 and the inner wall of the wellbore. The outer sidewall of the ring seat 2 has several mounting grooves 5 evenly distributed around the circumference for installing the telescopic component and the centering block 3.

[0029] Several straightening blocks 3 are evenly distributed along the periphery of the ring seat 2. In this embodiment, four straightening blocks 3 are provided, which are in an arc shape. Each straightening block 3 is installed in the mounting groove 5 of the ring seat 2 through a telescopic component. The arc-shaped outer surface of the straightening block 3 contacts the inner wall of the wellbore, thereby straightening and orienting the drill pipe body 1. The number of mounting grooves 5 matches the number of straightening blocks 3.

[0030] The telescopic component is an electro-hydraulic telescopic rod 4, model HT-M50, with a cylinder diameter of 25mm, a stroke of 20mm, and a rated working pressure of 10MPa. One end is fixed to the bottom of the mounting slot 5 with bolts, and the other end is fixedly connected to the centralizing block 3. The hydraulic system is powered by the drilling platform and connected to each electro-hydraulic telescopic rod 4 through oil pipes. The telescopic movement of the electro-hydraulic telescopic rod 4 can drive the centralizing block 3 to move radially, adjusting the contact force between the centralizing block 3 and the inner wall of the wellbore, thereby applying different guiding forces to the drill pipe body 1 to adjust the drilling direction.

[0031] The anti-detachment component is installed at both ends of the drill pipe body 1 to achieve a reliable connection between adjacent drill pipe bodies 1. It includes an external threaded connector 7, an internal threaded connector 8 and a limiting component. The external threaded connector 7 is fixedly connected to the top of the drill pipe body 1, and the internal threaded connector 8 is located at the bottom of the drill pipe body 1. The thread structures of the two are matched and can be initially connected by screwing.

[0032] The limiting component includes a limiting block 9 and a limiting groove 10. The limiting block 9 is fixedly connected to the external threaded connector 7 and has an umbrella-shaped structure. The limiting groove 10 is opened at the internal threaded connector 8 and is distributed in a ring shape on the side wall of the internal threaded connector 8, which is adapted to the limiting block 9. When the external threaded connector 7 and the internal threaded connector 8 are screwed to a certain position, the limiting block 9 is embedded in the limiting groove 10 to limit the adjacent drill pipe body 1 and prevent the connector from disengaging. In this embodiment, the limiting block 9 is made of 65Mn spring steel. The limiting block 9 has high strength and elasticity, with a tensile strength ≥980MPa, a yield strength ≥785MPa, and a high elastic limit. It can withstand the radial extrusion force during interference fit and is not prone to permanent deformation after long-term extrusion. It also has wear resistance and fatigue resistance. After quenching and medium-temperature tempering, a uniform martensitic structure is formed on the surface, which has excellent wear resistance and can resist friction and wear with the inner wall of the internal threaded connector 8 during screwing, thus extending the service life. The limiting block 9 is designed in an umbrella shape to prevent it from disengaging from the limiting groove 10 when it is engaged with the limiting groove 10, thereby enhancing the stability of the connection between the drill pipe bodies 1.

[0033] Working principle: When adjacent drill pipe bodies 1 are connected, the external threaded joint 7 of the previous drill pipe is screwed into the internal threaded joint 8 of the next drill pipe. The external threaded joint 7 and the internal threaded joint 8 are initially fixed by the screwing, and part of the torque and axial force are transmitted. As the screwing goes deeper, the umbrella-shaped limiting block 9 on the external threaded joint 7 gradually aligns with the annular limiting groove 10 on the internal threaded joint 8. When the screwing reaches the predetermined position, the limiting block 9 is embedded in the limiting groove 10, forming a mechanical limit. The cooperation between the umbrella-shaped limiting block 9 and the annular limiting groove 10 can effectively resist the reverse torque and axial force, prevent the joint from disengaging, and ensure the reliability of the drill pipe connection.

[0034] When the drill pipe is directionally drilled, the contact state between the centralizing block 3 and the inner wall of the wellbore can be adjusted by controlling the extension and retraction of the electro-hydraulic telescopic rod 4. When it is necessary to keep the drill pipe centered during drilling, the electro-hydraulic telescopic rod 4 corresponding to each centralizing block 3 is controlled to extend synchronously, so that the centralizing block 3 evenly contacts the inner wall of the wellbore, resisting the centrifugal force and axial deviation force of the drill pipe rotation, and ensuring that the drill pipe drills along the designed trajectory. When it is necessary to adjust the drilling direction, the extension amount of the centralizing block 3 in the corresponding direction is controlled to be greater than that in other directions. The contact force between the centralizing block 3 and the inner wall of the wellbore generates a guiding torque, pushing the drill pipe to deflect in the target direction, thus achieving directional drilling. Since the ring seat 2 and the drill pipe body 1 are rotatably connected by bearings, the ring seat 2 can remain relatively stationary when the drill pipe rotates, reducing the wear of the centralizing block 3.

[0035] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 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.

[0036] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A type of anti-detachment directional drill rod with a centering function, characterized in that, include: Drill pipe body (1); A straightening assembly is sleeved on the outside of the drill pipe body (1). The straightening assembly includes a ring seat (2) and a plurality of straightening blocks (3). The ring seat (2) is rotatably connected to the drill pipe body (1). The plurality of straightening blocks (3) are installed on the ring seat (2) through telescopic components. The plurality of straightening blocks (3) are evenly distributed along the periphery of the ring seat (2). The plurality of straightening blocks (3) abut against the inner wall of the wellbore to achieve straightening and orientation of the drill pipe body (1). An anti-detachment component is installed on the drill rod body (1), and adjacent drill rod bodies (1) are connected through the anti-detachment component.

2. The anti-detachment directional drill rod with centering as described in claim 1, characterized in that: The inner wall of the ring seat (2) is provided with a bearing groove (6), and the outer wall of the drill rod body (1) is provided with a bearing. The ring seat (2) and the drill rod body (1) are rotatably connected through the bearing and the bearing groove (6).

3. The anti-detachment directional drill rod with centering as described in claim 1, characterized in that: The outer wall of the ring seat (2) is provided with several mounting grooves (5), and a telescopic component is installed in the mounting groove (5). The straightening block (3) is installed at the other end of the telescopic component.

4. The anti-detachment directional drill rod with centering as described in claim 3, characterized in that: The telescopic component is an electro-hydraulic telescopic rod (4), one end of which is fixedly installed on the inner side wall of the mounting groove (5), and the other end is fixedly connected to the straightening block (3).

5. The anti-detachment directional drill rod with centering as described in claim 4, characterized in that: The centralizing block (3) has an arc-shaped structure, and the electric hydraulic telescopic rod (4) can extend to make the centralizing block (3) abut against the wellbore sidewall.

6. The anti-detachment directional drill rod with centering as described in claim 1, characterized in that: The anti-detachment component includes an external threaded connector (7), an internal threaded connector (8), and a limiting member. The external threaded connector (7) is fixedly connected to the top of the drill rod body (1), and the internal threaded connector (8) is located at the bottom of the drill rod body (1). The external threaded connector (7) matches the internal threaded connector (8). The limiting member is provided between adjacent external threaded connectors (7) and internal threaded connectors (8). The limiting member enables the connection between adjacent drill rod bodies (1) to be stable.

7. The anti-detachment directional drill rod with centering as described in claim 6, characterized in that: The limiting component includes a limiting block (9) and a limiting groove (10). The limiting block (9) is fixedly connected to the external threaded joint (7), and the limiting groove (10) is opened at the internal threaded joint (8). The limiting block (9) and the limiting groove (10) are adapted to each other.

8. The anti-detachment directional drill pipe with centering as described in claim 7, characterized in that: The limiting block (9) has an umbrella-shaped structure, and the limiting groove (10) has an annular structure distributed on the side wall of the internal threaded joint (8).

Images