Drill bit applied to shallow geothermal well drilling

Abstract

The utility model relates to the technical field of geothermal drilling, and discloses a drill bit applied to shallow geothermal drilling, which comprises a drill rod, an octagonal connecting column is inserted in the drill rod, two mounting holes are arranged on the surface of the drill rod, mounting components are inserted in the mounting holes, and the octagonal connecting column is connected with the mounting components. The bottom end of the octagonal connecting column is fixedly connected with a drill column, and the bottom end of the drill column is fixedly connected with a drill bit. According to the drill bit applied to shallow geothermal well drilling, through the arrangement of the abrasion assembly, the installation assembly, the octagonal connecting column and the insertion ring, when the drill bit is used, whether tungsten carbide cutting teeth are abraded to the positions of color observation strips or not is observed, and when replacement is conducted, the octagonal connecting column is connected to a drill rod, and the installation column is used for limiting; and compared with a common round or threaded shape, the contact area can be increased, so that the stability of the drill bit in the downward drilling process is improved, quick replacement is achieved, and the time for rotating and replacing the threads is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal drilling, in particular to a drill bit used for shallow geothermal drilling. Background Art

[0002] Shallow geothermal heat refers to the low-temperature heat stored in the soil, sand and groundwater within hundreds of meters of the earth's shallow surface. It is mainly sourced from solar radiation, and a small part comes from the heat of the earth's core. It is a renewable energy source with a generally constant temperature. Shallow geothermal heat has the advantages of huge reserves, wide distribution, green environmental protection, and recyclability. When exploiting and using geothermal energy, geothermal drilling will be used. Geothermal drilling is used for drilling geothermal steam and geothermal water. It is an important special technology and a necessary means for the exploration and exploitation of geothermal fluids. In the process of shallow geothermal exploitation, the drill bit plays the role of breaking rocks and forming wellbores. In the process of rotating and descending the drill bit, it may encounter very hard rocks. The torque at the moment of contact between the drill bit and the hard rock can easily cause damage to the drill bit.

[0003] In actual use, most of the existing geothermal drilling drill bits are directly fixed to the drill pipe by threads. However, the drill bit needs to be replaced after long-term use. The thread groove will wear over time, which is not conducive to extending the service life and stability of the drill pipe.

[0004] After searching the existing patents: A special drill bit based on geothermal exploration drilling (Announcement No.: CN217813319U), the utility model relates to a special drill bit based on geothermal exploration drilling, including a connecting rod, the bottom of the connecting rod is fixedly connected with a protection component, the bottom of the protection component is fixedly connected with a drill rod, and the bottom of the drill rod is fixedly connected with a drill bit body. In the process of geothermal exploration drilling, the protection pin mainly bears the torque that drives the drill bit body to rotate. When the drill bit body encounters soft soil or hard rock, it can work normally. When the drill bit body encounters harder rock, the instantaneous excessive torque will cause the protection pin to break, causing the connecting rod to idle, thereby protecting the drill bit body. The setting of the anti-drop component prevents the drill bit body from falling to the bottom of the well after the protection pin breaks, which is convenient for recovery. The overall structure achieves the purpose of good protection effect of the special drill bit based on geothermal exploration drilling, and reduces the possibility of excessive damage to the drill bit.

[0005] Although the above patent can prevent the drill bit from falling, during use, the cutting teeth will generate vibration when they come into contact with the rock to break it, causing the drill bit to shake left and right, which is not conducive to improving the stability and accuracy of the drill bit.

[0006] Therefore, it is necessary to invent a drill bit for shallow geothermal drilling to solve the above problems. Utility Model Content

[0007] 1. Technical issues to be solved

[0008] The technical problem solved by the utility model is to provide a drill bit for shallow geothermal drilling that is highly practical, can be simply operated, and has a relatively simple structure. It solves the problem raised in the above background technology that during use, the cutting teeth contact and crush the rocks to generate vibration, causing the drill bit to shake left and right, making it inconvenient to improve the stability and accuracy of the drill bit.

[0009] (II) Technical solution

[0010] To achieve the above objectives, the utility model is implemented through the following technical solutions: a drill bit used for shallow geothermal drilling, comprising a drill rod, an octagonal connecting column is inserted into the interior of the drill rod, two mounting holes are provided on the surface of the drill rod, a mounting assembly is inserted into the interior of the mounting holes, the bottom end of the octagonal connecting column is fixedly connected to a drill string, the bottom end of the drill string is fixedly connected to a drill bit, four crushing assemblies are fixedly connected to the surface of the drill bit, an observation groove is provided on one side of the crushing assembly, a wear assembly is fixedly connected to the interior of the observation groove, a plurality of buffer rods are fixedly connected to the top surface of the drill bit, a buffer assembly is sleeved on the surface of the buffer rod, a limiting ring is fixedly connected to the top surface of the buffer assembly, a fixing block is fixedly connected to the surface of the limiting ring, a supporting spring is fixedly connected to the top of the limiting ring, and a spiral cone drill is fixedly connected to the bottom end of the drill bit.

[0011] As a further solution of the utility model, the mounting assembly includes a mounting column inserted into the mounting hole, and both ends of the mounting column are threadedly connected with mounting nuts, and the mounting nuts are convenient for fixing the mounting column.

[0012] As a further solution of the utility model, two limiting holes are provided on the surface of the octagonal connecting column, and the limiting holes are adapted to the mounting column, so that the limiting holes facilitate the installation of the octagonal connecting column.

[0013] As a further solution of the utility model, the crushing assembly includes a crushing steel plate fixedly connected to the surface of the drill bit, and a plurality of tungsten carbide cutting teeth are fixedly connected to one side of the crushing steel plate. The tungsten carbide cutting teeth facilitate crushing soil or other soil layers.

[0014] As a further solution of the utility model, the wear assembly includes a color observation bar fixedly connected to the inside of the observation slot, and the surface of the color observation bar is fixedly connected with an anti-corrosion layer, and the color observation bar facilitates observation of the degree of wear.

[0015] As a further solution of the utility model, the buffer assembly includes a buffer spring sleeved on the surface of the buffer rod, and the top surface of the buffer spring is fixedly connected to a buffer frame, which is convenient for mitigating impact force.

[0016] As a further solution of the utility model, a groove is provided on the surface of the drill string, and an insert ring is fixedly connected to the bottom end of the drill rod. The groove is matched with the insert ring, and the insert ring is convenient for improving thermal stability.

[0017] As a further solution of the utility model, dispersion grooves are provided around the drill bit, and water holes are provided on the inner walls of the dispersion grooves. The dispersion grooves are convenient for quickly dispersing the crushed rock chips or other cuttings.

[0018] (III) Beneficial effects

[0019] The utility model provides a drill bit for shallow geothermal drilling, which has the following beneficial effects:

[0020] 1. The drill bit used for shallow geothermal drilling is provided with a spiral cone drill, a drill bit, a crushing assembly and a dispersion groove. When performing shallow geothermal operations, the spiral cone drill is first lowered, and the tungsten carbide cutting teeth cut and crush the borehole formed during the lowering process. The dispersion groove increases the speed of diversion and chip removal, and quickly cleans the cut rock chips or other cuttings, thereby improving the working efficiency of the drilling and extending the service life of the drill bit.

[0021] 2. The drill bit used for shallow geothermal drilling is provided with a wear assembly, a mounting assembly, an octagonal connecting column, and an insert ring. When in use, observe whether the tungsten carbide cutting teeth are worn to the position of the color observation strip. When replacing, connect the octagonal connecting column to the drill pipe and use the mounting column for limiting. Because the connecting column is octagonal, compared with the common circular or threaded shape, the contact area can be increased, so that the drill bit has improved stability during drilling, and can be quickly replaced, reducing the time for thread rotation replacement.

[0022] 3. The drill bit used for shallow geothermal drilling has a buffer rod, a buffer assembly, a support spring and a fixed block. When in use, the tungsten carbide cutting teeth and the rock formation will produce vibration when drilling down and cutting, which is transmitted to the drill rod, causing the drill bit to shake. The buffer rod runs through the middle of the buffer spring, the buffer frame and the support spring. When the vibration is felt, the buffer spring is squeezed downward, the buffer rod rises, the support spring and the buffer frame provide support for the buffer rod, and the buffer spring disperses the impact force, thereby achieving a buffering effect, avoiding the transmission of vibration to the drill bit during the drilling process, improving the drilling efficiency, and reducing the wear and energy consumption of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the installation assembly structure of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the buffer component of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the wear component of the utility model.

[0027] In the figure: 1. drill rod; 2. octagonal connecting column; 3. mounting assembly; 301. mounting column; 302. mounting nut; 4. drill column; 5. drill bit; 6. crushing assembly; 601. crushing steel plate; 602. tungsten carbide cutting tooth; 7. wear assembly; 701. color observation strip; 702. anti-corrosion layer; 8. buffer rod; 9. buffer assembly; 901. buffer spring; 902. buffer frame; 10. limit ring; 11. fixing block; 12. support spring; 13. spiral cone drill; 14. insert ring; 15. dispersion groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figures 1 to 4The utility model provides a technical solution: a drill bit used for shallow geothermal drilling, comprising a drill rod 1, an octagonal connecting column 2 is inserted into the interior of the drill rod 1, two mounting holes are provided on the surface of the drill rod 1, a mounting assembly 3 is inserted into the interior of the mounting hole, a drill column 4 is fixedly connected to the bottom end of the octagonal connecting column 2, a drill bit 5 is fixedly connected to the bottom end of the drill column 4, four crushing assemblies 6 are fixedly connected to the surface of the drill bit 5, an observation groove is provided on one side of the crushing assembly 6, a wear assembly 7 is fixedly connected to the interior of the observation groove, and through the arrangement of the wear assembly 7, the mounting assembly 3, the octagonal connecting column 2, and the insert ring 14, in use When the drill bit 5 is drilled, observe whether the tungsten carbide cutting teeth 602 are worn to the position of the color observation strip 701. When replacing, connect the octagonal connecting column 2 to the drill rod 1 and use the mounting column 301 to limit the position. Because the connecting column is octagonal, compared with the common circular or threaded shape, the contact area can be increased, so that the drill bit 5 can improve the stability during the drilling process, and can be quickly replaced, reducing the time for thread rotation replacement. The top surface of the drill bit 5 is fixedly connected to a plurality of buffer rods 8, and the surface of the buffer rod 8 is sleeved with a buffer assembly 9. The top surface of the buffer assembly 9 is fixedly connected to a limiting ring 10, and the surface of the limiting ring 10 is fixedly connected to The top of the fixed block 11 and the limit ring 10 are fixedly connected with a support spring 12. Through the arrangement of the buffer rod 8, the buffer assembly 9, the support spring 12 and the fixed block 11, when in use, the tungsten carbide cutting teeth 602 and the rock formation will produce a vibration when drilling down, which is transmitted to the drill rod 1, causing the drill bit 5 to shake. The buffer rod 8 passes through the middle of the buffer spring 901, the buffer frame 902 and the support spring 12. When the vibration is felt, the buffer spring 901 is squeezed downward, the buffer rod 8 rises, the support spring 12 and the buffer frame 902 provide support for the buffer rod 8, and the buffer spring 901 disperses the impact force, thereby achieving the buffering effect. The invention can avoid the vibration of the drill bit 5 during the drilling process, improve the drilling efficiency, and reduce the wear and energy consumption of the drill bit 5. The bottom end of the drill bit 5 is fixedly connected with a spiral cone drill 13. Through the arrangement of the spiral cone drill 13, the drill bit 5, the crushing assembly 6 and the dispersion groove 15, when performing shallow geothermal operations, the spiral cone drill 13 is firstly lowered, and the tungsten carbide cutting teeth 602 cut and crush the borehole formed during the lowering process. The dispersion groove 15 increases the speed of diversion and chip removal, and quickly cleans the cut rock chips or other cut objects, thereby improving the working efficiency of the drilling and extending the service life of the drill bit 5.

[0030] The mounting assembly 3 includes a mounting column 301 inserted into the mounting hole, and both ends of the mounting column 301 are threadedly connected with mounting nuts 302. The setting of the mounting assembly 3 plays a role in installation limit.

[0031] Two limiting holes are provided on the surface of the octagonal connecting column 2, and the limiting holes are adapted to the mounting column 301. The setting of the octagonal connecting column 2 increases the connection stability.

[0032] The crushing assembly 6 includes a crushing steel plate 601 fixedly connected to the surface of the drill bit 5, and a plurality of tungsten carbide cutting teeth 602 are fixedly connected to one side of the crushing steel plate 601. The arrangement of the crushing assembly 6 facilitates the crushing of rock formations.

[0033] The wear assembly 7 includes a color observation strip 701 fixedly connected to the inside of the observation slot, and the surface of the color observation strip 701 is fixedly connected with an anti-corrosion layer 702. The setting of the wear assembly 7 plays a role in observing the degree of wear;

[0034] The buffer assembly 9 includes a buffer spring 901 sleeved on the surface of the buffer rod 8, and a buffer frame 902 is fixedly connected to the top surface of the buffer spring 901. The buffer assembly 9 is provided to disperse the force and extend the service life of the drill bit 5.

[0035] A slot is provided on the surface of the drill string 4, and an insert ring 14 is fixedly connected to the bottom end of the drill rod 1. The slot is adapted to the insert ring 14, and the insert ring 14 is provided to connect the drill rod 1 and the drill string 4.

[0036] The drill bit 5 is provided with dispersion grooves 15 on all sides thereof, and the inner wall of the dispersion grooves 15 is provided with water holes. The dispersion grooves 15 are provided to disperse and discharge rock chips or other cuttings.

[0037] In the utility model, the working steps of the device are as follows:

[0038] Step 1: When performing shallow geothermal operations, the spiral cone drill 13 is first lowered, and the tungsten carbide cutting teeth 602 cut and crush the drill holes formed during the lowering process, and the speed of chip removal is increased through the dispersion groove 15;

[0039] Step 2: During use, observe whether the tungsten carbide cutting teeth 602 are worn to the position of the color observation strip 701. When replacing, connect the octagonal connecting column 2 to the drill pipe 1 and use the mounting column 301 for positioning. Because the connecting column is octagonal, it can increase the contact area compared to the common circular or threaded shapes.

[0040] The third step: when in use, the tungsten carbide cutting teeth 602 will produce vibration when drilling and cutting with the rock formation, which is transmitted to the drill rod 1, causing the drill bit 5 to shake. The buffer rod 8 passes through the middle of the buffer spring 901, the buffer frame 902 and the support spring 12. When the vibration is felt, the buffer spring 901 is squeezed downward, the buffer rod 8 rises, the support spring 12 and the buffer frame 902 provide support for the buffer rod 8, and the buffer spring 901 disperses the impact force.

[0041] It should be noted that the equipment structure and drawings of the utility model mainly describe the principle of the utility model. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above utility model, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field;

[0042] The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drill bit for shallow geothermal drilling, comprising a drill rod (1), characterized in that: An octagonal connecting column (2) is inserted into the interior of the drill rod (1), two mounting holes are provided on the surface of the drill rod (1), and mounting components (3) are inserted into the interior of the mounting holes. The bottom end of the octagonal connecting column (2) is fixedly connected to a drill column (4), and the bottom end of the drill column (4) is fixedly connected to a drill bit (5). Four crushing components (6) are fixedly connected to the surface of the drill bit (5). An observation groove is provided on one side of the crushing component (6), and a wear component (7) is fixedly connected to the interior of the observation groove. A plurality of buffer rods (8) are fixedly connected to the top surface of the drill bit (5), and a buffer component (9) is sleeved on the surface of the buffer rod (8). A limiting ring (10) is fixedly connected to the top surface of the buffer component (9), and a fixing block (11) is fixedly connected to the surface of the limiting ring (10). A support spring (12) is fixedly connected to the top end of the limiting ring (10), and a spiral cone drill (13) is fixedly connected to the bottom end of the drill bit (5).

2. A drill bit for shallow geothermal drilling according to claim 1, characterized in that: The mounting assembly (3) comprises a mounting column (301) inserted into the mounting hole, and both ends of the mounting column (301) are threadedly connected with mounting nuts (302).

3. A drill bit for shallow geothermal drilling according to claim 1, characterized in that: Two limiting holes are provided on the surface of the octagonal connecting column (2), and the limiting holes are adapted to fit the mounting column (301).

4. A drill bit for shallow geothermal drilling according to claim 1, characterized in that: The crushing assembly (6) comprises a crushing steel plate (601) fixedly connected to the surface of the drill bit (5), and a plurality of tungsten carbide cutting teeth (602) are fixedly connected to one side of the crushing steel plate (601).

5. The drill bit for shallow geothermal drilling according to claim 1, characterized in that: The wear assembly (7) comprises a color observation strip (701) fixedly connected to the inside of the observation slot, and an anti-corrosion layer (702) is fixedly connected to the surface of the color observation strip (701).

6. A drill bit for shallow geothermal drilling according to claim 1, characterized in that: The buffer assembly (9) comprises a buffer spring (901) sleeved on the surface of the buffer rod (8), and the top surface of the buffer spring (901) is fixedly connected to a buffer frame (902).

7. A drill bit for shallow geothermal drilling according to claim 1, characterized in that: A clamping groove is provided on the surface of the drill column (4), and an inserting ring (14) is fixedly connected to the bottom end of the drill rod (1), and the clamping groove is matched with the inserting ring (14).

8. The drill bit for shallow geothermal drilling according to claim 1, characterized in that: The drill bit (5) is provided with dispersion grooves (15) on all sides thereof, and the inner wall of the dispersion groove (15) is provided with water holes.

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