Gas lift reverse circulation drilling machine using threaded connection drill rod

Abstract

The utility model discloses a gas lift reverse circulation drilling machine using a threaded connection drill rod, which comprises a speed reducer, the power input end of the speed reducer is provided with a driving motor, the lower end of the speed reducer is provided with a drilling mechanism, and the speed reducer is provided with a gas guide mechanism; the drilling mechanism comprises a rotating sleeve, a conversion pipe, a threaded pipe, a hollow drill rod and a drill bit; the air guide mechanism comprises a slurry discharging pipe, an end cover, an air inlet, an air inlet hole, a first rotating sealing ring, a protective pipe, a second rotating sealing ring, an air guide channel and an air guide disc. The drilling tool has the advantages that a plurality of drilling rods are connected through threads, labor intensity of workers is reduced when the drilling rods are disassembled and assembled, working efficiency is improved, air leakage can be prevented by installing the first rotating sealing rings at the upper end and the lower end of the rotating sleeve, and the drilling tool is safe and reliable. And the air can be conveniently guided into the lowest drill rod through the air guide channel and the air guide disc, so that the air can be conveniently discharged.

Description

Technical Field

[0001] This utility model relates to the field of rock drilling equipment technology, and more specifically, to an air-lift reverse circulation drilling machine using threaded connection drill rods. Background Technology

[0002] The working principle of an air-lift reverse circulation drilling rig is to create a density difference between the inside and outside of the drill pipe using compressed air, thereby achieving reverse circulation drilling. Specifically, compressed air is injected into the annulus of the double-layer drill string through an air-water tap or air injection connector. After the gas flows to the bottom of the drill pipe, it is injected into the inner tube through an air mixer, forming a low-density gas-liquid mixture. This mixture creates a pressure difference between the wellbore and the cuttings discharge pipe, causing the mixture to flow upward at a high velocity, thereby continuously discharging the core or cuttings from the bottom of the hole to the surface.

[0003] In existing technologies, as the drilling depth increases, the number of drill pipes needs to be increased. Generally, drill pipes are connected by flanges. When disassembling and assembling drill pipes, workers need to unscrew multiple bolts before installation, which increases the labor intensity of workers and also reduces work efficiency.

[0004] It should be noted that the above content falls within the scope of the technical knowledge of the utility model owner and does not necessarily constitute prior art. Utility Model Content

[0005] The purpose of this invention is to solve the above problems by designing an air-lift reverse circulation drilling machine that uses a threaded connection drill rod.

[0006] The technical solution of this utility model to achieve the above objectives is as follows: an air-lift reverse circulation drilling machine using a threaded connection drill rod, including a reducer, the reducer having two power input ends, a drive motor installed at the power input ends of the reducer, a drilling mechanism installed at the lower end of the reducer, and an air guiding mechanism installed on the reducer.

[0007] The drilling mechanism includes a rotating sleeve installed at the power output end of the reducer. A conversion tube is fixedly connected to the lower end of the rotating sleeve. A threaded tube is fixedly connected to the lower end of the conversion tube. The threaded tube has an external thread at its lower end. Multiple hollow drill rods are connected to the lower end of the threaded tube. The hollow drill rods have internal threads at their upper ends and external threads at their lower ends. Adjacent hollow drill rods are connected by threads. The uppermost hollow drill rod is connected to the threaded tube by threads. A drill bit is connected to the lowermost hollow drill rod.

[0008] The air guiding mechanism includes a slurry discharge pipe located at the upper end of the reducer, an end cap installed on the slurry discharge pipe, the end cap being bolted to the upper end of the reducer, the lower end of the slurry discharge pipe extending into the rotating sleeve, an air inlet on one side of the upper end of the reducer, and multiple air inlets at the upper end of the rotating sleeve, with first rotating sealing rings installed above and below the air inlets between the rotating sleeve and the reducer, a protective pipe installed at the lower end of the slurry discharge pipe, a gap existing between the protective pipe and the rotating sleeve, multiple second rotating sealing rings installed between the slurry discharge pipe and the protective pipe, the lower end of the protective pipe being fixedly connected to the lower end of the rotating sleeve via multiple connecting rods, an air guiding channel installed at the lower end of the rotating sleeve, and an air guiding disc installed on the hollow drill rod, the air guiding channel guiding air into the air guiding disc, and the air guiding disc guiding air to the drill bit.

[0009] Furthermore, the lower end of the rotating sleeve is connected to the conversion pipe via a first flange, and the lower end of the conversion pipe is connected to the threaded pipe via a second flange.

[0010] Furthermore, the lower end of the protective tube extends into the inside of the first flange, a fixed sealing ring is installed between the protective tube and the first flange, and vent holes are opened on both sides of the first flange and the second flange, and the two ends of the air guide channel are respectively connected to the vent holes on the first flange and the second flange.

[0011] Furthermore, the air guide plate includes a fixed platform installed at both ends of the hollow drill rod. The fixed platform has an annular groove on one side surface located on the outer side. Two air guide holes are opened in the annular groove. The air guide holes at corresponding positions on the two air guide plates are connected by a connecting pipe. A sealing gasket is placed inside the air guide plate at the upper end of the hollow drill rod.

[0012] Furthermore, the sealing gasket includes a first annular rubber gasket, and a second annular rubber gasket is provided inside the first annular rubber gasket. The first annular rubber gasket and the second annular rubber gasket are concentrically corresponding, and the first annular rubber gasket and the second annular rubber gasket are connected by multiple rubber strips.

[0013] Furthermore, the number of rubber strips is odd, the thickness of the rubber strips is thinner than the thickness of the first and second annular rubber pads, and the rubber strips are evenly distributed circumferentially between the first and second annular rubber pads.

[0014] The beneficial effects of this utility model are: multiple drill rods are connected by threads, which reduces the labor intensity of workers and improves work efficiency when disassembling and assembling drill rods; by installing the first rotating sealing ring at the upper and lower ends of the rotating sleeve, air leakage can be prevented; and air can be easily introduced into the lowermost drill rod through the air guide channel and air guide plate, which facilitates the discharge of air.

[0015] When connecting the drill rods, the two fixed platforms can be pressed together and sealed with a gasket to prevent air leakage. Furthermore, no matter what position the drill rod is rotated to, air can be discharged through the annular groove and air guide hole, making it more convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an air-lift reverse circulation drilling rig using a threaded connection drill rod as described in this utility model;

[0017] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0018] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0019] Figure 4 yes Figure 1 A magnified view of a section at point C;

[0020] Figure 5 yes Figure 1 A magnified view of a section at point D;

[0021] Figure 6 This is a schematic diagram showing the connection relationship between the first and second annular rubber pads of this utility model.

[0022] Figure 7 This is a schematic diagram showing the positional relationship between the first annular rubber pad, the second annular rubber pad, and the rubber strip of this utility model;

[0023] In the diagram, 1. Reducer; 2. Drive motor; 3. Rotating sleeve; 4. Converter pipe; 5. Threaded pipe; 6. Hollow drill rod; 8. Drill bit; 9. Slurry discharge pipe; 10. End cap; 11. Air inlet; 12. Air inlet hole; 13. First rotating sealing ring; 14. Protective pipe; 15. Second rotating sealing ring; 16. Connecting rod; 17. Air guide channel; 18. Air guide plate; 19. First flange; 20. Second flange; 21. Fixed sealing ring; 22. Vent hole; 23. Fixed platform; 24. Circular groove; 25. Air guide hole; 26. Connecting pipe; 27. Sealing gasket; 28. First circular rubber gasket; 29. ​​Second circular rubber gasket; 30. Rubber strip. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] This utility model provides, for example Figure 1-7The air-lift reverse circulation drilling rig using threaded drill rods, as shown, includes a reducer 1 with two power input ends. A drive motor 2 is installed at each power input end of the reducer 1. A drilling mechanism is installed at the lower end of the reducer 1, and an air guiding mechanism is also installed on the reducer 1. The drilling mechanism includes a rotating sleeve 3 installed at the power output end of the reducer 1. A conversion pipe 4 is fixedly connected to the lower end of the rotating sleeve 3. A threaded pipe 5 is fixedly connected to the lower end of the conversion pipe 4. The threaded pipe 5 has external threads at its lower end and multiple hollow drill rods 6 are connected to its lower end. Each hollow drill rod 6 has internal threads at its upper end and external threads at its lower end. Adjacent hollow drill rods 6 are connected by threads. The uppermost hollow drill rod 6 is threaded to the threaded pipe 5, and a drill bit 8 is connected to the lowermost hollow drill rod 6. The air guiding mechanism includes a discharge valve located at the upper end of the reducer 1. The slurry pipe 9 has an end cap 10 installed on it. The end cap 10 is bolted to the upper end of the reducer 1. The lower end of the slurry pipe 9 extends into the rotating sleeve 3. The reducer 1 has an air inlet 11 on one side of its upper end. The rotating sleeve 3 has multiple air inlets 12 on its upper end. The air inlets 12 are equipped with first rotating sealing rings 13 installed between the rotating sleeve 3 and the reducer 1. The lower end of the slurry pipe 9 has a protective pipe 14 installed. There is a gap between the protective pipe 14 and the rotating sleeve 3. Multiple second rotating sealing rings 15 are installed between the slurry pipe 9 and the protective pipe 14. The lower end of the protective pipe 14 is fixedly connected to the lower end of the rotating sleeve 3 through multiple connecting rods 16. The lower end of the rotating sleeve 3 has an air guide channel 17 installed. The hollow drill rod 6 has an air guide plate 18 installed. The air guide channel 17 can guide air into the air guide plate 18. The air guide plate 18 can guide air to the drill bit 8.

[0027] The drilling process of this device is as follows: The drive motor 2 is started and rotated, which in turn drives the reducer 1 to rotate. After being reduced in speed by the reducer 1, the rotating sleeve 3 rotates. The rotating sleeve 3 is fixedly connected to the conversion pipe 4, which is also fixedly connected to the threaded pipe 5. The threaded pipe 5 is connected to the hollow drill rod 6 via threads. Thus, when the rotating sleeve 3 rotates, it drives the hollow drill rod 6 to rotate, which in turn drives the drill bit 8 to rotate. The reducer 1 is installed on a lifting platform, which allows the reducer 1 to move up and down. When the drill bit 8 rotates, it moves downwards. During drilling, an external air pump draws air and introduces it into the reducer 1 through the air inlet 11. The first rotating sealing ring 13 prevents air leakage, allowing air to enter the inside of the rotating sleeve 3 through the air inlet 12. The end cap 10 prevents air from leaking out from above. The second rotating... The sealing ring 15 prevents air from entering the protective tube 14, allowing the air to move downwards. The air is then guided to the drill bit 8 through the air guide channel 17 and the air guide plate 18. The air mixes with the mud at the drill bit 8, reducing the mud density. Under pressure, the mud is discharged through the hollow drill rod 6, threaded tube 5, conversion tube 4, protective tube 14, and discharge pipe 9. When it is necessary to increase the number of hollow drill rods 6, the uppermost hollow drill rod 6 is clamped with a chuck, and the drive motor 2 is reversed, which drives the rotating sleeve 3, conversion tube 4, and threaded tube 5 to rotate. This allows the threaded tube 5 to separate from the uppermost hollow drill rod 6. The elevator then drives the reducer 1, rotating sleeve 3, conversion tube 4, and threaded tube 5 upwards to add new hollow drill rods 6. The rotation of the rotating sleeve 3, conversion tube 4, and threaded tube 5 connects the hollow drill rods 6.

[0028] Refer to the instruction manual appendix Figure 1 Included with instruction manual Figure 4 The holding rack 6 includes a rotating shaft 8. The lower end of the rotating sleeve 3 is connected to the conversion pipe 4 through the first flange 19. The lower end of the conversion pipe 4 is connected to the threaded pipe 5 through the second flange 20. When the rotating sleeve 3 rotates, it can drive the conversion pipe 4 and the threaded pipe 5 to rotate.

[0029] Refer to the instruction manual appendix Figure 1 Included with instruction manual Figure 4The lower end of the protective tube 14 extends into the inside of the first flange 19. A fixed sealing ring 21 is installed between the protective tube 14 and the first flange 19. Vent holes 22 are opened on both sides of the first flange 19 and the second flange 20. The two ends of the air guide channel 17 are connected to the vent holes 22 on the first flange 19 and the second flange 20, respectively. The air between the rotating cylinder 3 and the protective tube 14 can be blocked by the fixed sealing ring 21, so that the air can flow downward through the vent holes 22 on the first flange 19. Then, the air can be introduced into the vent holes 22 on the second flange 20 through the air guide channel 17. The vent holes 22 on the second flange 20 can introduce the air into the air guide plate 18 below.

[0030] Refer to the instruction manual appendix Figure 1 Instruction manual attached Figure 5 Included with instruction manual Figure 6 The air guide plate 18 includes a fixed platform 23 installed at both ends of the hollow drill rod 6. The outer side surface of the fixed platform 23 has an annular groove 24. Two air guide holes 25 are opened in the annular groove 24. The air guide holes 25 at corresponding positions on the two air guide plates 18 are connected by a connecting pipe 26. A sealing gasket 27 is placed inside the air guide plate 18 at the upper end of the hollow drill rod 6. The air discharged from the air guide channel 17 can enter the annular groove 24 inside the fixed platform 23. The sealing gasket 27 can prevent air leakage. In this way, the air can move downward through the air guide hole 25 and the connecting pipe 26 and enter the annular groove 24 inside the lower fixed platform 23. The fixed platforms 23 on the two hollow drill rods 6 are tightly attached together. The sealing gasket 27 can prevent air leakage. In this way, the air can move through the lower annular groove 24 and the air guide hole 25. In this way, the air can enter the lowermost drill bit 8.

[0031] Refer to the instruction manual appendix Figure 6 The sealing gasket 27 includes a first annular rubber gasket 28, and a second annular rubber gasket 29 is provided inside the first annular rubber gasket 28. The first annular rubber gasket 28 and the second annular rubber gasket 29 are concentrically corresponding. The first annular rubber gasket 28 and the second annular rubber gasket 29 are connected by a plurality of rubber strips 30. The first annular rubber gasket 28 and the second annular rubber gasket 29 can prevent air from leaking out from both sides of the fixed platform 23. The rubber strips 30 can connect the first annular rubber gasket 28 and the second annular rubber gasket 29 into a whole.

[0032] Refer to the instruction manual appendix Figure 6 Included with instruction manual Figure 7The number of rubber strips 30 is odd, and the thickness of the rubber strips 30 is thinner than the thickness of the first annular rubber pad 28 and the second annular rubber pad 29. The rubber strips 30 are evenly distributed in a circle between the first annular rubber pad 28 and the second annular rubber pad 29. When the first annular rubber pad 28 and the second annular rubber pad 29 are squeezed, the thinner rubber strips 30 allow air to pass under them, facilitating airflow. The air guide holes 25 are located on both sides inside the annular groove 24. The number of rubber strips 23 is odd and they are evenly distributed, eliminating the possibility of both air guide holes 25 being blocked at the same time, thus facilitating airflow.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas lift reverse circulation drilling rig using threaded connection drill rods, comprising a reducer (1), wherein the reducer (1) is provided with two power input ends, and a drive motor (2) is installed at the power input ends of the reducer (1), characterized in that, A drilling mechanism is installed at the lower end of the reducer (1), and an air guiding mechanism is installed on the reducer (1); The drilling mechanism includes a rotating sleeve (3) installed at the power output end of the reducer (1). A conversion tube (4) is fixedly connected to the lower end of the rotating sleeve (3). A threaded tube (5) is fixedly connected to the lower end of the conversion tube (4). The threaded tube (5) has an external thread at its lower end. Multiple hollow drill rods (6) are connected to the lower end of the threaded tube (5). The hollow drill rods (6) have internal threads at their upper ends and external threads at their lower ends. Adjacent hollow drill rods (6) are connected by threads. The uppermost hollow drill rod (6) is connected to the threaded tube (5) by threads. A drill bit (8) is connected to the lowermost hollow drill rod (6). The air guiding mechanism includes a slurry discharge pipe (9) located at the upper end of the reducer (1), an end cap (10) is installed on the slurry discharge pipe (9), the end cap (10) is connected to the upper end of the reducer (1) by bolts, the lower end of the slurry discharge pipe (9) extends into the rotating sleeve (3), an air inlet (11) is opened on one side of the upper end of the reducer (1), and multiple air inlets (12) are opened at the upper end of the rotating sleeve (3). A first rotating sealing ring (13) is installed above and below the air inlet (12) between the rotating sleeve (3) and the reducer (1), and a protective seal is installed at the lower end of the slurry discharge pipe (9). There is a gap between the protective pipe (14) and the rotating sleeve (3). Multiple second rotating sealing rings (15) are installed between the slurry discharge pipe (9) and the protective pipe (14). The lower end of the protective pipe (14) is fixedly connected to the lower end of the rotating sleeve (3) through multiple connecting rods (16). An air guide channel (17) is installed at the lower end of the rotating sleeve (3). An air guide plate (18) is installed on the hollow drill rod (6). The air guide channel (17) can guide air into the air guide plate (18), and the air guide plate (18) can guide air to the drill bit (8).

2. The air-lift reverse circulation drilling rig using threaded drill pipe as described in claim 1, characterized in that, The lower end of the rotating sleeve (3) is connected to the conversion pipe (4) through the first flange (19), and the lower end of the conversion pipe (4) is connected to the threaded pipe (5) through the second flange (20).

3. A gas-lift reverse circulation drilling rig using threaded drill rods according to claim 2, characterized in that, The lower end of the protective tube (14) extends into the inside of the first flange (19). A fixed sealing ring (21) is installed between the protective tube (14) and the first flange (19). Vent holes (22) are opened on both sides of the first flange (19) and the second flange (20). The two ends of the air guide channel (17) are connected to the vent holes (22) on the first flange (19) and the second flange (20) respectively.

4. A gas lift reverse circulation drilling rig using threaded drill pipes according to claim 1, characterized in that, The air guide plate (18) includes a fixed platform (23) installed at both ends of the hollow drill rod (6). The fixed platform (23) has an annular groove (24) on one side surface located on the outside. Two air guide holes (25) are opened in the annular groove (24). The air guide holes (25) at corresponding positions on the two air guide plates (18) are connected by a connecting pipe (26). A sealing gasket (27) is placed inside the air guide plate (18) at the upper end of the hollow drill rod (6).

5. A gas lift reverse circulation drilling rig using threaded drill rods according to claim 4, characterized in that, The sealing gasket (27) includes a first annular rubber gasket (28), and a second annular rubber gasket (29) is provided inside the first annular rubber gasket (28). The first annular rubber gasket (28) and the second annular rubber gasket (29) are concentrically corresponding, and the first annular rubber gasket (28) and the second annular rubber gasket (29) are connected by multiple rubber strips (30).

6. A gas lift reverse circulation drilling rig using threaded drill rods according to claim 5, characterized in that, The number of rubber strips (30) is odd, and the thickness of the rubber strips (30) is thinner than the thickness of the first annular rubber pad (28) and the second annular rubber pad (29). The rubber strips (30) are evenly distributed in a circle between the first annular rubber pad (28) and the second annular rubber pad (29).

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