Centralizer for well drilling

Abstract

The centralizer for well drilling comprises an outer barrel and an inner rod, the inner rod is rotationally connected to the interior of the outer barrel, an upper connector is installed at the upper end of the inner rod, a connecting piece is connected to the outer end face of the upper connector in a threaded mode, the bottom of the inner rod is connected with a lower connector through a second limiting piece, and the lower connector is connected with the outer end face of the inner rod. A plurality of supporting mechanisms which are distributed at intervals are arranged on the peripheral wall of the outer cylinder; the supporting mechanism comprises a mounting sliding groove block, a mounting assembly, a mounting plate, buffer rods, a connecting assembly and a side plate, the mounting sliding groove block is arranged on the peripheral wall of the outer cylinder, the side, away from the outer cylinder, of the mounting sliding groove block is connected with the mounting plate, the multiple buffer rods are arranged on the peripheral wall of the mounting plate, and the connecting assembly is connected with the side plate. The sides, away from the outer cylinder, of the multiple buffer rods are connected with the side plates through the connecting assemblies correspondingly. According to the utility model, the overall durability and reliability are improved, the service life is effectively prolonged, and waste caused by damage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, and in particular to a drilling centralizer. Background Technology

[0002] A centralizer, also known as a stabilizer, is a tool used to stabilize downhole drilling tools and prevent deviation. It is connected to the drill string and is used to stabilize the drilling direction. It is an important tool in oil, gas and geological exploration drilling projects to prevent well deviation changes.

[0003] Chinese Patent 202420446887.6 provides a centralizer for oil drilling, comprising: a rotating drum; an outer cylinder fixedly connected to the circumferential side of the rotating drum, and multiple sets of outer cylinders are provided; an inner groove is opened inside the outer cylinder; a sliding rod is slidably connected inside the inner groove; a spring is fixedly connected to the left end of the sliding rod; the spring matches the inner groove; and a limiting plate is provided inside the inner groove. This utility model provides a centralizer for oil drilling, which can easily correct the rotating drum to the center of the oil well through the inclined surface of the inclined plate. After the device is lowered into the oil well, the rotating roller contacts the inner wall of the oil well. When the device rises and falls, the rotation of the rotating roller prevents the side plate from rubbing against the inner wall of the oil well. The elasticity of the limiting plate allows the sliding rod to move outward from the outer cylinder, thereby making the rotating roller tightly adhere to the inner wall of the oil well. At this time, the left and right friction of the rotating roller prevents the side plate from rotating along the oil well. The sliding of the sliding rod inside the outer cylinder can adjust the distance between the side plate and the rotating drum, thus allowing the device to adapt to oil wells of different diameters.

[0004] However, the aforementioned centralizer uses a fixed connection design between its side plate and outer cylinder. When a local side plate is worn or damaged due to long-term exposure to complex stress, high temperature and high pressure, and drilling fluid erosion, the entire centralizer often needs to be replaced. This not only significantly increases maintenance costs but also causes serious material waste. Therefore, a drilling centralizer is proposed to solve the above problems. Utility Model Content

[0005] (a) Purpose of the utility model

[0006] To address the technical problems existing in the background art, this utility model proposes a drilling centralizer, which improves overall durability and reliability through a support mechanism, effectively extends service life, and reduces waste caused by damage.

[0007] (II) Technical Solution

[0008] This utility model provides a drilling centralizer, including an outer cylinder and an inner rod. The inner rod is rotatably connected to the inside of the outer cylinder. An upper connector is installed on the upper end of the inner rod, and a connecting piece is threaded onto the outer end face of the upper connector. The bottom of the inner rod is connected to the lower connector through a second limiting piece. Multiple spaced support mechanisms are provided on the outer peripheral wall of the outer cylinder. Each support mechanism includes a mounting slide block, a mounting assembly, a mounting plate, a buffer rod, a connecting assembly, and a side plate. The mounting slide block is located on the outer peripheral wall of the outer cylinder, and the side of the mounting slide block away from the outer cylinder is connected to the mounting plate. Multiple buffer rods are located on the outer peripheral wall of the mounting plate, and the sides of the multiple buffer rods away from the outer cylinder are respectively connected to the side plate through the connecting assembly.

[0009] Preferably, the mounting assembly includes a fixed threaded rod, a fixed nut, a limiting block, and a limiting hole. The fixed threaded rod is disposed on the inner bottom wall of the mounting slide block, the limiting hole penetrates vertically through the limiting block, the limiting block is inserted into the interior of the mounting slide block, and the fixed threaded rod is inserted into the limiting hole. The fixed nut is threaded onto the upper end of the fixed threaded rod, and the mounting plate is disposed on the side of the limiting block away from the outer cylinder.

[0010] Preferably, the height of the limiting block is the same as the height of the mounting groove inside the mounting slide block, and the height of the fixing threaded rod is higher than the height of the limiting hole.

[0011] Preferably, the connecting assembly includes an alignment groove block, a fixing screw, and an alignment block. The alignment block is located on the side of the buffer rod away from the outer cylinder, the alignment groove block is located on the side of the side plate near the outer cylinder, the alignment block is inserted into the alignment groove block, the fixing screw passes through the outer end face of the alignment groove block and extends into the interior of the alignment block, and the fixing screw and the alignment block are connected by a thread.

[0012] Preferably, the side plate is rotatably connected to a plurality of rollers on the side away from the outer cylinder, and the bottom of the side plate is provided with an inclined plate.

[0013] Preferably, the connector includes a threaded cylinder and a first limiting plate. The threaded cylinder is coaxially disposed on the upper end face of the first limiting plate. Both the first limiting plate and the threaded cylinder pass through the upper connector. The threaded cylinder and the outer end face of the upper connector are connected by a thread.

[0014] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0015] This drilling centralizer, through its installation components, allows for easy assembly and disassembly of the mounting plate, and through its connecting components, it allows for the assembly and disassembly of the side plates, thus improving overall durability and reliability, effectively extending its service life, and reducing waste caused by damage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a drilling centralizer proposed in this utility model.

[0017] Figure 2 This is a partial exploded view of a drilling centralizer proposed in this utility model.

[0018] Figure 3 This is an exploded view of the installation components in a drilling centralizer proposed in this utility model.

[0019] Figure 4 This utility model proposes a drilling centralizer. Figure 1 A magnified view of A in the middle.

[0020] Reference numerals: 1. Upper connector; 2. Threaded cylinder; 3. First limiting piece; 4. Lower connector; 5. Second limiting piece; 6. Inclined plate; 7. Mounting slide block; 8. Mounting plate; 9. Roller; 10. Side plate; 11. Buffer rod; 12. Outer cylinder; 13. Inner rod; 14. Fixing nut; 15. Fixing threaded rod; 16. Alignment groove block; 17. Limiting hole; 18. Limiting block; 19. Fixing screw; 20. Alignment block. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, such as welding, riveting, or bonding; it can also be a detachable connection, such as threaded connection, keyed connection, or pin connection; or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1-4 As shown, the present invention proposes a drilling centralizer, which includes an outer cylinder 12 and an inner rod 13. The inner rod 13 is rotatably connected to the inside of the outer cylinder 12. An upper connector 1 is installed on the upper end of the inner rod 13. A connecting piece is threaded on the outer end face of the upper connector 1. The bottom of the inner rod 13 is connected to the lower connector 4 through a second limiting piece 5. Multiple spaced support mechanisms are provided on the outer peripheral wall of the outer cylinder 12.

[0025] In this utility model, during installation, the inner rod 13 is inserted into the inside of the outer cylinder 12, and then the inner rod 13 is installed inside the outer cylinder 12 by rotating the connecting piece. Then the upper connector 1 and the lower connector 4 are connected to the drill string respectively, and the equipment can then be installed in the well.

[0026] With multiple installation mechanisms, damaged parts can be replaced, improving overall durability and reliability, effectively extending service life, and reducing waste caused by damage.

[0027] In an optional embodiment, the support mechanism includes a mounting slide block 7, a mounting assembly, a mounting plate 8, buffer rods 11, a connecting assembly, and a side plate 10. The mounting slide block 7 is disposed on the outer peripheral wall of the outer cylinder 12, and the side of the mounting slide block 7 away from the outer cylinder 12 is connected to the mounting plate 8. A plurality of buffer rods 11 are disposed on the outer peripheral wall of the mounting plate 8, and the sides of the plurality of buffer rods 11 away from the outer cylinder 12 are respectively connected to the side plate 10 through the connecting assembly.

[0028] It should be noted that the installation components facilitate the replacement of damaged parts on the mounting plate 8, and the connecting components facilitate the replacement of partially damaged parts; the buffer rod 11 can be adapted to different wellheads.

[0029] In an optional embodiment, the mounting assembly includes a fixed threaded rod 15, a fixed nut 14, a limiting block 18, and a limiting hole 17. The fixed threaded rod 15 is disposed on the inner bottom wall of the mounting slide block 7, and the limiting hole 17 penetrates vertically through the limiting block 18. The limiting block 18 is inserted into the interior of the mounting slide block 7, and the fixed threaded rod 15 is inserted into the limiting hole 17. The fixed nut 14 is threaded onto the upper end of the fixed threaded rod 15. The mounting plate 8 is disposed on the side of the limiting block 18 away from the outer cylinder 12. The height of the limiting block 18 is the same as the height of the mounting groove inside the mounting slide block 7, and the height of the fixed threaded rod 15 is higher than the height of the limiting hole 17.

[0030] It should be noted that when the limiting block 18 needs to be removed from the inside of the mounting slide block 7, the fixing threaded rod 15 is separated from the fixing nut 14 by rotating the fixing nut 14, and then the limiting block 18 is removed from the inside of the mounting slide block 7; during installation, the limiting block 18 is installed inside the mounting slide block 7, and the fixing threaded rod 15 is inserted into the limiting hole 17 to ensure the stability of the installation, and the limiting block 18 is fixed inside the mounting slide block 7 by rotating the fixing nut 14 in the opposite direction.

[0031] In an optional embodiment, the connecting assembly includes an alignment groove 16, a fixing screw 19, and an alignment block 20. The alignment block 20 is located on the side of the buffer rod 11 away from the outer cylinder 12, and the alignment groove 16 is located on the side of the side plate 10 near the outer cylinder 12. The alignment block 20 is inserted into the alignment groove 16. The fixing screw 19 passes through the outer end face of the alignment groove 16 and extends into the interior of the alignment block 20. The fixing screw 19 and the alignment block 20 are threaded together. The alignment block 20 is rectangular, and the alignment groove 16 is adapted to the alignment block 20.

[0032] It should be noted that when the side plate 10 is damaged, a tool is used to rotate the fixing screws 19 of the multiple alignment groove blocks 16 on the side plate 10, and then the fixing screws 19 are pulled out from the inside of the alignment block 20, and the alignment block 20 is pulled out from the inside of the alignment groove block 16. A usable side plate 10 is prepared, and the multiple alignment groove blocks 16 on the side plate 10 are fitted into the inside of the multiple alignment blocks 20. The fixing screws 19 are rotated in the opposite direction by the tool so that the alignment block 20 can be fixed inside the alignment groove block 16; thus, a part can be replaced.

[0033] In an optional embodiment, a plurality of rollers 9 are rotatably connected to the side of the side plate 10 away from the outer cylinder 12, and an inclined plate 6 is provided at the bottom of the side plate 10.

[0034] It should be noted that the inclined plate 6 facilitates the lowering of the equipment into the well; and the multiple rollers 9 reduce friction during the lifting and lowering of the equipment.

[0035] In an optional embodiment, the connector includes a threaded cylinder 2 and a first limiting plate 3. The threaded cylinder 2 is coaxially disposed on the upper end face of the first limiting plate 3. Both the first limiting plate 3 and the threaded cylinder 2 pass through the upper connector 1, and the threaded cylinder 2 and the outer end face of the upper connector 1 are connected by threads.

[0036] It should be noted that after the inner rod 13 is installed inside the outer cylinder 12, the threaded cylinder 2 is rotated a certain number of times to make the threaded cylinder 2 threadedly connected to the upper connector 1, thereby installing the inner rod 13.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drilling centralizer, comprising an outer cylinder (12) and an inner rod (13), wherein the inner rod (13) is rotatably connected to the interior of the outer cylinder (12), an upper connector (1) is installed at the upper end of the inner rod (13), a connecting piece is threadedly connected to the outer end face of the upper connector (1), and the bottom of the inner rod (13) is connected to a lower connector (4) via a second limiting piece (5), characterized in that, The outer cylinder (12) has multiple spaced support mechanisms on its outer peripheral wall; the support mechanism includes a mounting slide block (7), a mounting assembly, a mounting plate (8), a buffer rod (11), a connecting assembly, and a side plate (10). The mounting slide block (7) is located on the outer peripheral wall of the outer cylinder (12), and the side of the mounting slide block (7) away from the outer cylinder (12) is connected to the mounting plate (8). Multiple buffer rods (11) are located on the outer peripheral wall of the mounting plate (8), and the side of the multiple buffer rods (11) away from the outer cylinder (12) is connected to the side plate (10) through the connecting assembly.

2. A drilling centralizer according to claim 1, characterized in that, The mounting assembly includes a fixed threaded rod (15), a fixed nut (14), a limiting block (18), and a limiting hole (17). The fixed threaded rod (15) is located on the inner bottom wall of the mounting slide block (7). The limiting hole (17) passes vertically through the limiting block (18). The limiting block (18) is inserted into the mounting slide block (7), and the fixed threaded rod (15) is inserted into the limiting hole (17). The fixed nut (14) is threaded onto the upper end of the fixed threaded rod (15). The mounting plate (8) is located on the side of the limiting block (18) away from the outer cylinder (12).

3. A drilling centralizer according to claim 2, characterized in that, The height of the limiting block (18) is the same as the height of the mounting groove inside the mounting slide block (7), and the height of the fixing threaded rod (15) is higher than the height of the limiting hole (17).

4. A drilling centralizer according to claim 1, characterized in that, The connecting assembly includes a positioning groove block (16), a fixing screw (19), and a positioning block (20). The positioning block (20) is located on the side of the buffer rod (11) away from the outer cylinder (12). The positioning groove block (16) is located on the side of the side plate (10) close to the outer cylinder (12). The positioning block (20) is inserted into the positioning groove block (16). The fixing screw (19) passes through the outer end face of the positioning groove block (16) and extends into the interior of the positioning block (20). The fixing screw (19) and the positioning block (20) are connected by threads.

5. A drilling centralizer according to claim 1, characterized in that, The side plate (10) away from the outer cylinder (12) is rotatably connected to a plurality of rollers (9), and the bottom of the side plate (10) is provided with an inclined plate (6).

6. A drilling centralizer according to claim 1, characterized in that, The connector includes a threaded cylinder (2) and a first limiting plate (3). The threaded cylinder (2) is coaxially disposed on the upper end face of the first limiting plate (3). The first limiting plate (3) and the threaded cylinder (2) both pass through the upper connector (1). The outer end face of the threaded cylinder (2) and the upper connector (1) are connected by threads.

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