Downhole PDC (polycrystalline diamond compact) micro-reaming drilling tool while drilling

Abstract

The utility model discloses an underground while-drilling PDC (Polycrystalline Diamond Compact) micro-reaming drilling tool which comprises a pipe body, two sides of the pipe body are respectively connected with a female buckle and a male buckle, the outer side wall of the pipe body is fixedly connected with a plurality of PDC reaming pieces, the PDC reaming pieces can cut a well wall under the action of centrifugal force in the drilling process, so that the diameter expansion is realized, and the drilling efficiency is improved. Meanwhile, in the process of lifting and lowering a drill column, forward reaming or backward reaming can be achieved, slight dog legs are eliminated, a rock debris bed is stirred, the two containing barrels are detachably arranged on the two sides of the pipe body respectively, the multiple supporting air bags are linearly distributed on one side of each containing barrel, and the supporting assemblies are arranged on the two sides of the pipe body respectively. The supporting assemblies are arranged between the containing barrels and the adjacent supporting air bags. According to the downhole while-drilling PDC micro-reaming drilling tool, the abrasion condition of the PDC micro-reaming drill bit during transportation can be reduced conveniently, and therefore the reaming effect of drilling can be improved conveniently.

Description

Technical Field

[0001] This utility model relates to the field of PDC micro-reaming drill bit technology, specifically to a downhole PDC micro-reaming drilling tool. Background Technology

[0002] Well reaming is an operation that enlarges the diameter of an existing wellbore during the drilling process. It is widely used in oil and gas extraction, geological exploration, and engineering construction. PDC microreaming while drilling can not only enlarge the well diameter and facilitate casing running, but also eliminate minor doglegs and agitate the cuttings bed. PDC microreaming while drilling usually uses PDC cutting tools to cut rocks at high speed by rotating at high speed using the hardness and wear resistance of diamond.

[0003] For example, a downhole microreamer drilling tool with patent publication number CN205370445U uses PDC teeth and wear-resistant columns brazed on an eccentric centralizing wing. The wear-resistant columns are 0.5-1mm higher than the PDC teeth, which can effectively protect the PDC teeth. It can not only enlarge the well diameter, but also solve the problem of stuck drill bits in cuttings beds. Although it is convenient for downhole microreamer drilling, the overall shape of this downhole PDC microreamer drill bit is irregular. It is prone to shaking or even wear during transportation, which will affect the final drilling and reaming effect. Although the downhole PDC microreamer drill bit can be protected by multiple layers of protective padding during transportation, the packaging and disassembly time is long, which can easily affect the efficiency of downhole microreamer drilling. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a downhole PDC micro-reamer drilling tool to solve the problem of wear and tear on PDC micro-reamers during transportation, as mentioned in the background technology.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a downhole PDC micro-reaming drilling tool, comprising a pipe body, with female and male threads respectively connected to both sides of the pipe body, and multiple PDC reaming plates fixedly connected to the outer wall of the pipe body, and further comprising a placement cylinder, a support airbag, a support assembly, a movable plate, an anti-sway frame, and a rotation assembly;

[0008] The placement cylinder is provided in two parts, and the two placement cylinders are detachably disposed on both sides of the tube body;

[0009] The support airbags are configured as multiple airbags, which are linearly distributed on one side of each placement cylinder;

[0010] The support assembly is disposed between each of the placement cylinders and the adjacent plurality of support airbags;

[0011] The movable plate is movably disposed within each of the placement cylinders;

[0012] The anti-sway frame is rotatably mounted on each of the movable plates;

[0013] The rotating assembly is installed between each of the anti-sway frames and the adjacent movable plate.

[0014] Furthermore, the support component includes:

[0015] A support ring, wherein multiple support rings are provided, and the multiple support rings are respectively disposed on multiple support airbags;

[0016] The support column is provided in multiple ways, and the multiple support columns are respectively fixedly connected between the multiple support rings;

[0017] A support plate, which is fixedly connected to one of the multiple support columns;

[0018] Two support screws are provided, and the two support screws are symmetrically threaded between the support plate and the placement cylinder.

[0019] Furthermore, the rotating assembly includes:

[0020] Two fixed plates are provided, and the two fixed plates are symmetrically and detachably connected to each of the movable plates;

[0021] A rotating rod is rotatably disposed between the two fixed plates, and the fixed plates are provided with a rotating groove for the rotating rod to rotate, and the rotating rod is fixedly connected to the movable plate.

[0022] Furthermore, multiple connecting pipes are connected between the multiple supporting airbags, and an air inlet pipe is connected to one of the multiple connecting pipes, and an air inlet valve is provided on the air inlet pipe.

[0023] Furthermore, the placement cylinder has a movable cavity for the movable plate to move, and two limiting blocks are symmetrically connected on the movable plate. The inner sidewall of the placement cylinder has a limiting groove for the limiting blocks to slide.

[0024] Furthermore, each of the anti-sway brackets is provided with an anti-sway screw hole, and each of the anti-sway screw holes is threaded with an anti-sway screw.

[0025] Furthermore, the movable plate has an installation opening that matches the anti-sway frame, and a pull ring is fixedly connected to one side of the movable plate.

[0026] Furthermore, each of the movable plates has two symmetrically arranged fixing holes that match the fixed plate, and the fixed plate has two symmetrically connected fixing blocks. The movable plate has a fixing groove that matches the fixing block, and each fixing block is threadedly connected to the movable plate with a fixing screw.

[0027] (III) Beneficial Effects

[0028] Compared with the prior art, this utility model provides a downhole PDC micro-reaming drilling tool, which has the following beneficial effects:

[0029] 1. In this utility model, the PDC micro-reaming drill bit is easily assembled by the pipe body, female thread, male thread and multiple PDC reaming plates, so as to facilitate downhole PDC micro-reaming operation and thus facilitate stable reaming operation in drilling;

[0030] 2. In this utility model, the tube body facilitates the separate placement of the two placement cylinders, and the two support components facilitate the separate connection of multiple support airbags, so that the multiple support airbags can provide internal support to the tube body. This can increase the stability of the placement cylinders placed in the tube body, and at the same time, it can reduce internal shock absorption of the tube body, which can reduce the impact of vibration generated during transportation on the PDC micro-reaming drill bit, thereby improving the transportation efficiency of the PDC micro-reaming drill bit.

[0031] 3. In this utility model, the sliding of the movable plate within the placement cylinder facilitates the adjustment of the anti-sway frame's position. The rotating component allows for easy rotation of the anti-sway frame, ensuring it is installed vertically. Furthermore, the cooperation between the anti-sway frame and the anti-sway screws allows for the fixation of the anti-sway frame, movable plate, placement cylinder, and pipe body on the transport vehicle. This improves the stability of the PDC micro-reamer during transport, reduces wear on the PDC micro-reamer during transport, and enhances the reaming effect during drilling. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of this application;

[0033] Figure 2 For this application Figure 1 A magnified schematic diagram of the local structure at point A;

[0034] Figure 3 This is a cross-sectional structural diagram showing the fit between the placement cylinder, support column, and limiting block in this application.

[0035] Figure 4This is a structural diagram showing the assembly of the movable plate, anti-sway frame, and pull ring in this application;

[0036] Figure 5 This is an exploded structural diagram showing the assembly of the anti-sway frame, the fixing plate, and the rotating rod in this application;

[0037] Figure 6 This is a schematic diagram of the planar structure of the tube body, female thread and PDC expansion plate of this application.

[0038] In the diagram: 1. Tube body; 2. Female thread; 3. Male thread; 4. PDC expansion plate; 5. Placement cylinder; 6. Support airbag; 7. Movable plate; 8. Anti-sway frame; 9. Support ring; 10. Support column; 11. Support plate; 12. Support screw; 13. Fixing plate; 14. Rotating rod; 15. Connecting pipe; 16. Inlet pipe; 17. Limiting block; 18. Anti-sway screw; 19. Pull ring; 20. Fixing block; 21. Fixing screw. Detailed Implementation

[0039] 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.

[0040] Please see Figures 1 to 6 A downhole PDC micro-reaming drilling tool includes a pipe body 1, with female threads 2 and male threads 3 connected to both sides of the pipe body 1. Multiple PDC reaming blades 4 are fixedly connected to the outer wall of the pipe body 1 to facilitate the assembly of the PDC micro-reaming drill bit. During drilling, the PDC reaming blades 4 cut the well wall under centrifugal force, thereby achieving diameter enlargement. Simultaneously, during the raising and lowering of the drill string, forward or reverse reaming can be achieved, eliminating slight doglegs and disturbing the cuttings bed. The tool also includes a placement cylinder 5, a support airbag 6, a support assembly, a movable plate 7, an anti-sway frame 8, and a rotating assembly. Two placement cylinders 5 are provided, each... The support airbags 6 are detachably mounted on both sides of the tube body 1. Multiple support airbags 6 are arranged linearly on one side of each placement cylinder 5. The support assembly is set between each placement cylinder 5 and the adjacent multiple support airbags 6. The movable plate 7 is movably set inside each placement cylinder 5. The anti-sway frame 8 is rotatably mounted on each movable plate 7. The rotating assembly is installed between each anti-sway frame 8 and the adjacent movable plate 7. The movable plate 7 has a mounting opening that matches the anti-sway frame 8. When the anti-sway frame 8 rotates into the mounting opening and maintains a horizontal state, its bottom end is flush with the bottom end of the movable plate 7, which allows the movable plate 7 to move stably into the placement cylinder 5 for storage.

[0041] refer to Figure 3 The support assembly includes a support ring 9, a support column 10, a support plate 11, and a support screw 12. Multiple support rings 9 are provided and are respectively provided on multiple support airbags 6. Multiple support columns 10 are provided and are respectively fixedly connected between multiple support rings 9. The support plate 11 is fixedly connected to one of the multiple support columns 10. Two support screws 12 are provided and are symmetrically threaded between the support plate 11 and the placement cylinder 5. The placement cylinder 5 and the support column 10 can be connected and disassembled through the support screw 12 and the support plate 11, so that multiple support columns 10, multiple support rings 9 and multiple support airbags 6 can be disassembled from one side of the placement cylinder 5.

[0042] Multiple support columns 10 and support rings 9 can stably support multiple support airbags 6, so that multiple support airbags 6 can be moved into the tube body 1 in sequence.

[0043] refer to Figure 4 as well as Figure 5 The rotating assembly includes a fixed plate 13 and a rotating rod 14. There are two fixed plates 13, which are symmetrically and detachably connected to each movable plate 7. The rotating rod 14 is rotatably disposed between the two fixed plates 13, and the fixed plate 13 is provided with a rotating groove for the rotating rod 14 to rotate. The rotating rod 14 is fixedly connected to the movable plate 7.

[0044] After the movable plate 7 is moved to a suitable position outside the tube body 1, the anti-sway frame 8 is rotated by the rotating rod 14 and the rotating groove, so that the anti-sway frame 8 is in a vertical state, and the anti-sway frame 8 can be stably installed on the transport vehicle.

[0045] refer to Figure 2 as well as Figure 3 Multiple supporting airbags 6 are connected by multiple connecting pipes 15, and one of the multiple connecting pipes 15 is connected to an air inlet pipe 16, and an air inlet valve is provided on the air inlet pipe 16.

[0046] The air inlet pipe 16 can be connected to an external air intake device. When the air intake valve is opened, air can be supplied to multiple support airbags 6 in sequence through the air inlet pipe 16 and multiple connecting pipes 15. This causes the multiple support airbags 6 to gradually open and provide stable internal support to the inner wall of the tube body 1. At the same time, the support airbags 6 will be fixed inside the tube body 1, and can also fix the position of the placement cylinder 5 inside the tube body 1. In addition, the multiple support airbags 6 can reduce the impact of vibration generated during transportation on the tube body 1, thereby reducing the impact of transportation vibration on the PDC micro-reaming drill bit.

[0047] refer to Figure 3The placement cylinder 5 has a movable cavity for the movable plate 7 to move. A pull ring 19 is fixedly connected to one side of the movable plate 7, which can stably pull out or push the movable plate 7 in the movable cavity. Two limiting blocks 17 are symmetrically connected to the movable plate 7. A limiting groove for the limiting blocks 17 to slide is provided on the inner side wall of the placement cylinder 5.

[0048] When the movable plate 7 moves inside and outside the movable cavity, the position of the anti-sway frame 8 and the like can be adjusted so that the anti-sway frame 8 and the like can be moved to a suitable position. At the same time, when the movable plate 7 moves, the limiting block 17 will move in the limiting groove, so that the movable plate 7 and the anti-sway frame 8 and the like can move stably in the placement cylinder 5.

[0049] refer to Figure 5 Each anti-sway bracket 8 is provided with an anti-sway screw hole, and each anti-sway screw hole is threaded with an anti-sway screw 18.

[0050] When the anti-sway bracket 8 is rotated to the vertical installation position, the anti-sway screw 18 is tightened between the anti-sway screw hole and the pad between the transport vehicle. This fixes the anti-sway bracket 8, the movable plate 7, and the placement cylinder 5 on the transport vehicle, thereby providing stable support for the pipe body 1 on the transport vehicle and preventing the PDC micro-reamer from shaking and wearing during transportation.

[0051] refer to Figure 5 Each movable plate 7 has two symmetrically opened fixing holes that match the fixed plate 13, and two fixing blocks 20 are symmetrically connected on the fixed plate 13. The movable plate 7 has a fixing groove that matches the fixing block 20, and each fixing block 20 is threadedly connected to the movable plate 7 with a fixing screw 21.

[0052] When the two fixing plates 13 are placed in the two fixing openings respectively, the two fixing blocks 20 will enter the two fixing slots respectively, and the fixing screws 21 will be turned between the fixing blocks 20 and the movable plate 7. The fixing blocks 20 and the fixing plates 13 can be stably installed on the movable plate 7, so that the rotating rod 14 and the anti-sway bracket 8 can be installed and removed on the movable plate 7.

[0053] In summary, when transporting PDC micro-reaming drill bits, two placement cylinders 5 are placed on both sides of the tube body 1, and multiple support airbags 6 are inflated through two air inlet pipes 16 and multiple connecting pipes 15, so that the multiple support airbags 6 gradually unfold to provide internal support for the tube body 1. Then, the movable plate 7 is pulled inside the placement cylinder 5. After the movable plate 7 moves to the appropriate position, the anti-sway frame 8 is rotated to a vertical position, and the anti-sway screw 18 is tightened between the anti-sway frame 8 and the pad of the transport tool. The anti-sway frame 8, movable plate 7, placement cylinder 5 and tube body 1 are fixed on the transport tool, so that the tube body 1 can be stably supported during transportation, which improves the stability of transporting PDC micro-reaming drill bits, reduces the shaking and wear of PDC micro-reaming drill bits during transportation, and thus improves the PDC micro-reaming effect during downhole drilling.

[0054] 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 downhole PDC micro-reaming drilling tool, comprising a pipe body (1), wherein female threads (2) and male threads (3) are respectively connected to both sides of the pipe body (1), and a plurality of PDC reaming plates (4) are fixedly connected to the outer side wall of the pipe body (1), characterized in that, Also includes: Placement cylinder (5), wherein two placement cylinders (5) are provided, and the two placement cylinders (5) are respectively detachably disposed on both sides of the tube body (1); Support airbags (6), wherein multiple support airbags (6) are arranged in a linear distribution on one side of each placement cylinder (5); A support assembly is disposed between each of the placement cylinders (5) and the adjacent plurality of support airbags (6); Movable plate (7), which is movably disposed within each of the placement cylinders (5); Anti-sway frame (8), which is rotatably mounted on each of the movable plates (7); A rotating assembly is installed between each of the anti-sway brackets (8) and the adjacent movable plate (7).

2. The downhole PDC micro-reaming drilling tool according to claim 1, characterized in that, The support components include: Support ring (9), wherein multiple support rings (9) are provided, and the multiple support rings (9) are respectively provided on multiple support airbags (6); Support column (10), wherein multiple support columns (10) are provided, and the multiple support columns (10) are respectively fixedly connected between multiple support rings (9); A support plate (11) is fixedly connected to one of the plurality of support columns (10); Support screws (12), two support screws (12) are provided, and the two support screws (12) are symmetrically threaded between the support plate (11) and the placement cylinder (5).

3. The downhole PDC micro-reaming drilling tool according to claim 2, characterized in that, The rotating assembly includes: Fixed plate (13), the fixed plate (13) is configured as two, the two fixed plates (13) are symmetrically and detachably connected to each of the movable plates (7); A rotating rod (14) is rotatably disposed between two fixed plates (13), and the fixed plates (13) are provided with a rotating groove for the rotating rod (14) to rotate, and the rotating rod (14) is fixedly connected to the movable plate (7).

4. The downhole PDC micro-reaming drilling tool according to claim 3, characterized in that, Multiple connecting pipes (15) are connected to the multiple supporting airbags (6), and an air inlet pipe (16) is connected to one of the multiple connecting pipes (15), and an air inlet valve is provided on the air inlet pipe (16).

5. The downhole PDC micro-reaming drilling tool according to claim 4, characterized in that, The placement cylinder (5) has a movable cavity for the movable plate (7) to move, and two limiting blocks (17) are symmetrically connected on the movable plate (7). The inner side wall of the placement cylinder (5) has a limiting groove for the limiting blocks (17) to slide.

6. The downhole PDC micro-reaming drilling tool according to claim 5, characterized in that, Each of the anti-sway brackets (8) is provided with an anti-sway screw hole, and each of the anti-sway screw holes is threaded with an anti-sway screw (18).

7. The downhole PDC micro-reaming drilling tool according to claim 6, characterized in that, The movable plate (7) has an opening that matches the anti-sway frame (8), and a pull ring (19) is fixedly connected to one side of the movable plate (7).

8. A downhole PDC micro-reaming drilling tool according to claim 7, characterized in that, Each of the movable plates (7) has two symmetrically opened fixing ports that match the fixed plate (13), and two fixing blocks (20) are symmetrically connected on the fixed plate (13). The movable plate (7) has a fixing groove that matches the fixing block (20), and each fixing block (20) is threadedly connected to the movable plate (7) with a fixing screw (21).

Images