An alloy drill bit for rock formation drilling

Abstract

The present invention belongs to the technical field of drill bits, and specifically relates to an alloy drill bit for rock formation drilling, which includes a drill bit base. A cutter wing is installed on the drill bit base, and cutting teeth are evenly installed on the cutter wing. A fixing seat is installed on the upper end surface of the drill bit base. The fixing seats are distributed in a ring shape, and a cone bit is installed on the fixing seat. A liquid spraying hole is formed in the drill bit base, and the outlet of the liquid spraying hole is located at the middle position of the fixing seats distributed in a ring shape. A chip guiding hole is formed in the drill bit base, the inlet of the chip guiding hole is located on the end surface of the drill bit base, and the outlet of the chip guiding hole is located on the side surface of the drill bit base. The inlet of the chip guiding hole surrounds the circumference of the liquid spraying hole, and the chip guiding hole is located between the outlet of the liquid spraying hole and the fixing seat. The structure of the present invention is simple, enabling the drill bit to have a certain buffering capacity, improving the service life of the drill bit, and solving the problem that the size of the rock debris obtained by the drill bit is too small to meet the requirements for identifying rock information in geology.

Description

Technical Field

[0001] The present invention belongs to the technical field of drill bits, and specifically relates to an alloy drill bit for rock formation drilling. Background Art

[0002] Drilling engineering is an important means and link in geological exploration and resource development. A drill bit is an essential drilling tool in the geological drilling industry. The reasonable selection of the drill bit has a huge impact on the drilling quality, drilling speed, and drilling cost.

[0003] In the case of relatively hard formations, roller cone bits are generally not used because they have a slow mechanical drilling speed and a short service life, often resulting in additional trips, increasing the drilling time and operation cost. Therefore, for relatively hard formations, PDC bits with a relatively fast mechanical drilling speed are usually used to improve the drilling speed. However, conventional PDC bits have the problem of relatively small cuttings size, which cannot meet the requirements for identifying rock information in geology. Therefore, in order to obtain cuttings that meet the geological requirements, sometimes roller cone bits still have to be used in relatively hard formations.

[0004] For the existing PDC bits for coring, although micro-core rocks can be formed during drilling, the formed micro-core rocks will fall under the action of gravity after breaking, and the falling micro-core rocks will be damaged due to the high-speed rotation of the PDC bit during the falling process, so relatively complete micro-core rocks still cannot be obtained, which cannot meet the requirements for identifying rock information in geology.

[0005] At the same time, the drill bit has a high operation intensity during drilling, the drill bit is subjected to a large impact, and the drill bit is easily damaged, resulting in the fracture and damage of the drill bit, and the drill bit needs to be frequently replaced, which affects the progress of the drilling work and results in low drilling efficiency. Summary of the Invention

[0006] In order to make up for the deficiencies of the existing technology, enable the drill bit to have a certain buffering ability, improve the service life of the drill bit, and solve the problem that the size of the rock debris obtained by the drill bit is relatively small and cannot meet the requirements for identifying rock information in geology, the present invention proposes an alloy drill bit for rock formation drilling.

[0007] The technical solution adopted by the present invention to solve its technical problems is: 1. An alloy drill bit for rock formation drilling according to the present invention, including a drill bit base, a cutter wing is installed on the drill bit base, cutting teeth are evenly installed on the cutter wing, a fixing base is installed on the upper end surface of the drill bit base, the fixing bases are distributed in a ring shape, and a roller cone is installed on the fixing base;

[0008] A liquid spraying hole is formed in the drill bit seat, and the outlet of the liquid spraying hole is located at the middle position of the annularly distributed fixing seats. A chip guiding hole is formed in the drill bit seat, the inlet of the chip guiding hole is located on the end face of the drill bit seat, and the outlet of the chip guiding hole is located on the side face of the drill bit seat;

[0009] The inlet of the chip guiding hole surrounds the circumference of the liquid spraying hole, and the chip guiding hole is located between the outlet of the liquid spraying hole and the fixing seats.

[0010] Preferably, an installation rod is installed on the end face of the drill bit seat, a recoil plate is installed at the other end of the installation rod, the height of the recoil plate does not exceed the height of the cone bit, and the recoil plate is located at the middle position of the annularly distributed fixing seats;

[0011] The cross section of the recoil plate is arc-shaped, the outlet of the liquid spraying hole is directly opposite to the center position of the recoil plate, and the edge of the recoil plate points to the inlet of the chip guiding hole.

[0012] Preferably, suction holes are formed in the recoil plate, the suction holes are distributed in a circle, the cross section of the suction holes is conical, and the center line of the suction holes is perpendicular to the side face of the recoil plate facing the drill bit seat.

[0013] Preferably, a drainage groove is formed on the side face of the drill bit seat, the side face of the drainage groove close to the cone bit is perpendicular to the center line of the drill bit seat, and the depth of the end of the drainage groove far from the drill bit seat gradually decreases;

[0014] The outlet of the chip guiding hole is located on the side face of the drainage groove close to the cone bit.

[0015] Preferably, a baffle is installed on the upper end face of the drill bit seat, and the baffle is located between the chip guiding hole and the fixing seats.

[0016] Preferably, the baffle does not contact the cone bit and the recoil plate, and the baffle is made of an elastic material.

[0017] Preferably, the drill bit further includes a drill bit base body, a male thread is arranged at the lower end of the drill bit base body, a standard thread is arranged at one end of the drill pipe located in the well, and the drill bit base body is connected to the standard thread on the drill pipe through the male thread;

[0018] An installation cavity is formed on the upper end face of the drill bit base body, the drill bit seat is installed in the installation cavity, the drill bit seat and the drill bit base body are connected by splines, a through hole is formed in the drill bit base body, and the through hole is communicated with the liquid spraying hole through the installation cavity;

[0019] The diameter of the through hole is larger than the diameter of the liquid spraying hole.

[0020] Preferably, a buffer ring is installed on the bottom surface of the installation cavity. The upper end surface of the buffer ring contacts the lower end surface of the drill bit base. The inner diameter of the buffer ring is larger than the diameter of the through hole, and the outer side wall of the buffer ring is closely attached to the inner wall of the installation cavity.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. For the alloy drill bit for rock formation drilling of the present invention, by providing the cone, the backflush plate and the chip guiding hole, during the drilling process, the drill bit obtains relatively large rock debris through the cone, and the rock debris passes through the chip guiding hole and is finally discharged outside the drilling well, enabling the staff to collect sufficient and relatively large rock debris, thereby obtaining sufficient geological information and improving the drilling effect and efficiency.

[0023] 2. For the alloy drill bit for rock formation drilling of the present invention, by providing the drill bit base, the drill bit matrix and the installation cavity, a relative movement space can be formed between the drill bit base and the drill bit matrix under the action of the drilling fluid, so that the drill bit has a certain buffering effect during the drilling process, reducing the impact on the drill bit, avoiding the fracture and damage of the drill bit, and prolonging the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 is the front view of the alloy drill bit of the present invention;

[0026] Figure 2 is the sectional view of the alloy drill bit of the present invention;

[0027] Figure 3 is Figure 2 the partial enlarged view at B in

[0028] Figure 4 is Figure 2 the partial enlarged view at A in

[0029] Figure 5 is Figure 3 the partial enlarged view at C in

[0030] In the figure: drill bit base 1, cutter blade 2, cutting tooth 21, fixing seat 3, cone 31, backflush plate 4, mounting rod 41, suction hole 42, baffle 43, liquid spraying hole 5, chip guiding hole 51, drainage groove 52, buffer ring 53, drill bit matrix 6, male thread 61, through hole 62, installation cavity 621. DETAILED DESCRIPTION OF THE INVENTION

[0031] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0032] As Figures 1 to 5 shown, an alloy drill bit for rock formation drilling according to the present invention includes a drill bit base 1, a cutter wing 2 is installed on the drill bit base 1, cutting teeth 21 are evenly installed on the cutter wing 2, the cutting teeth 21 are made of polycrystalline diamond compact, a fixing base 3 is installed on the upper end surface of the drill bit base 1, the fixing bases 3 are distributed in a ring shape, and a roller cone 31 is installed on the fixing base 3;

[0033] A liquid spraying hole 5 is opened in the drill bit base 1, and external drilling fluid is sent into the liquid spraying hole 5 through a communication hole 62 inside the drill pipe. The outlet of the liquid spraying hole 5 is located at the middle position of the fixing bases 3 distributed in a ring shape. A chip guiding hole 51 is opened in the drill bit base 1. The inlet of the chip guiding hole 51 is located on the end surface of the drill bit base 1, and the outlet of the chip guiding hole 51 is located on the side surface of the drill bit base 1;

[0034] The inlet of the chip guiding hole 51 surrounds the circumference of the liquid spraying hole 5, and the chip guiding hole 51 is located between the outlet of the liquid spraying hole 5 and the fixing base 3;

[0035] During operation, the drill bit base 1 is connected to the drill pipe on the drilling rig, and a PDC drill bit with a relatively high mechanical drilling speed, that is, the cutting teeth 21 on the cutter wing 2, is used for drilling. Therefore, it still has a relatively high drilling speed in places with a relatively high hardness of the underground rock formation, thereby improving the drilling speed and efficiency. At the same time, during the drilling process, the roller cone 31 installed on the end surface of the drill bit base 1 cuts the rock formation, thereby obtaining relatively large-sized rock debris, avoiding the problem that the rock debris drilled by a conventional PDC drill bit during drilling is relatively small in size and cannot meet the requirement for identifying rock information during geological drilling;

[0036] At the same time, during the drilling process, the rock debris drilled by the roller cone 31 on the drill bit base 1 will directly reach the space between the roller cone 31 and the end surface of the drill bit base 1. The drilling fluid sprayed out from the liquid spraying hole 5 on the end surface of the drill bit base 1 will fill the area where the drill bit is located, and under the action of the drilling fluid pressure input from the outside, it will be discharged towards the wellhead from the gap between the drill bit and the well. At this time, the relatively large-sized rock debris located between the roller cone 31 and the end surface of the drill bit base 1 enters the chip guiding hole 51 on the drill bit base 1 along with the drilling fluid, and reaches between the side surface of the drill bit base 1 and the wellbore wall of the well from the chip guiding hole 51. Then, under the pressure of the continuously fed drilling fluid and the extrusion of the subsequent generated rock debris, it moves towards the inlet direction and is discharged outside the wellbore, so that the staff can collect relatively large-sized rock debris at the wellhead, obtain the geological information underground at the drilling point, and improve the efficiency of rock formation drilling.

[0037] As an embodiment of the present invention, an installation rod 41 is installed on the end surface of the drill bit seat 1, and a backflush plate 4 is installed at the other end of the installation rod 41. The height of the backflush plate 4 does not exceed the height of the roller cone 31, and the backflush plate 4 is located at the middle position of the annularly distributed fixing seats 3;

[0038] The cross-section of the backflush plate 4 is arc-shaped. The outlet of the liquid spraying hole 5 faces the central position of the backflush plate 4, and the edge of the backflush plate 4 points to the inlet of the chip guiding hole 51;

[0039] During drilling, the drilling fluid ejected from the liquid spraying hole 5 on the drill bit seat 1 directly impacts the central position of the backflush plate 4. Since the cross-section of the backflush plate 4 is arc-shaped, the drilling fluid impacting the central position of the backflush plate 4 is guided by the shape of the backflush plate 4 itself, and thus scatters and flows along the backflush plate 4 towards the surface of the drill bit seat 1. At the same time, since the edge of the backflush plate 4 points to the inlet of the chip guiding hole 51, the drilling fluid after leaving the backflush plate 4 flows straight towards the inlet of the chip guiding hole 51. Therefore, through the guidance of the backflush plate 4, the relatively large-sized rock debris generated by the cutting of the roller cone 31 is carried by the drilling fluid and driven into the chip guiding hole 51. After passing through the chip guiding hole 51, it reaches between the drill bit seat 1 and the wellbore of the well, and finally is discharged from the wellhead, avoiding the situation that without guidance, most of the relatively large-sized rock debris passes through between the cutter blades 2 and the cutting teeth 21 along with the drilling fluid, and then reaches between the drill bit seat 1 and the wellbore of the well, resulting in the relatively large-sized rock debris being squeezed and broken by the cutter blades 2 and the cutting teeth 21, so that the size of the rock debris finally collected by the staff at the wellhead is small or the number of the relatively large-sized rock debris collected is too small, and the geological information underground at the drilling site cannot be effectively obtained, affecting the progress of the drilling work.

[0040] As an embodiment of the present invention, suction holes 42 are formed on the backflush plate 4. The suction holes 42 are distributed in a circumferential circle. The cross-section of the suction holes 42 is conical, and the center line of the suction holes 42 is perpendicular to the side surface of the backflush plate 4 facing the drill bit seat 1;

[0041] During drilling, after the drilling fluid is ejected from the liquid spraying hole 5, the drilling fluid cannot all enter the chip guiding hole 51 under the guidance of the backflush plate 4. Therefore, the space between the drill bit and the bottom of the well will be filled with the drilling fluid. During this process, the rock debris generated by the cutting of the roller cone 31 on the drill bit seat 1 will be immersed in the drilling fluid. At the same time, since the backflush plate 4 is located at the middle position of the annularly distributed fixing seats 3, the relative position of the rock debris generated by the cutting of the roller cone 31 is close to the backflush plate 4;

[0042] Meanwhile, due to the guidance of the drilling fluid ejected from the liquid ejection holes 5 by the side surface of the recoil plate 4 facing the drill bit seat 1, the flow velocity of the drilling fluid at the side surface of the recoil plate 4 facing the drill bit seat 1 is relatively fast. Therefore, when the drilling fluid crosses the suction holes 42 on the recoil plate 4, there is a difference in the flow velocity of the drilling fluid at both ends of the suction holes 42. According to Bernoulli's theorem, there is a pressure difference between the drilling fluid with a fast flow velocity and the drilling fluid with a slow flow velocity at the other end of the suction hole 42, so that the suction holes 42 generate an attraction force on the rock debris generated by the cutting of the cone 31 near the recoil plate 4, promoting the rock debris generated by the cutting of the cone 31 to pass through the suction holes 42, being driven by the drilling fluid with a fast flow velocity to the entrance of the chip guiding hole 51, and finally passing through the chip guiding hole 51, thereby increasing the number of relatively large-sized rock debris passing through the chip guiding hole 51, improving the possibility for the staff to collect relatively large-sized rock debris at the wellhead of the drilling, and improving the efficiency of obtaining geological information.

[0043] As an embodiment of the present invention, a drainage groove 52 is formed on the side surface of the drill bit seat 1. The side surface of the drainage groove 52 close to the cone 31 is perpendicular to the center line of the drill bit seat 1, and the depth of the end of the drainage groove 52 far from the drill bit seat 1 gradually decreases;

[0044] The outlet of the chip guiding hole 51 is located on the side surface of the drainage groove 52 close to the cone 31;

[0045] During use, the rock debris passing through the chip guiding hole 51 flows in the drainage groove 52 along with the discharged drilling fluid and is discharged towards the wellhead. At the same time, by setting the drainage groove 52 and the outlet of the chip guiding hole 51 on the side surface of the drainage groove 52 close to the cone 31, the rock debris passing through the chip guiding hole 51 will be blocked by the side surface of the drainage groove 52 close to the cone 31, avoiding the rock debris passing through the chip guiding hole 51 from directly sliding down under the action of gravity, resulting in the rock debris passing through the chip guiding hole 51 reaching the blade 2 and the cutting teeth 21 and being squeezed and broken by the blade 2 and the cutting teeth 21. At the same time, since the outlet of the chip guiding hole 51 is located on the side surface of the drainage groove 52 close to the cone 31, after the rock debris passes through the chip guiding hole 51, a relatively closed channel is formed between the drainage groove 52 and the well wall of the drilling. Therefore, under the push of the drilling fluid flowing out of the chip guiding hole 51 synchronously, it effectively promotes the rock debris to move towards the wellhead direction, enabling the rock debris to quickly leave the area where the drill bit is located and reach the area of the drill pipe with a diameter smaller than the drill bit, facilitating the discharge of the rock debris, thereby reducing the possibility that the rock debris passing through the chip guiding hole 51 slides down again during the upward movement and is squeezed and broken by the blade 2 and the cutting teeth 21, improving the possibility and quantity for the staff to obtain relatively large-sized rock debris, ensuring the effective and rapid acquisition of the geological information underground at the drilling site, and improving the drilling effect.

[0046] As an embodiment of the present invention, a baffle plate 43 is installed on the upper end surface of the drill bit base 1, and the baffle plate 43 is located between the chip guiding hole 51 and the fixed seat 3;

[0047] During use, when the drilling fluid ejected from the liquid spraying hole 5 changes its flow direction under the action of the recoil plate 4 and flows towards the entrance of the chip guiding hole 51, since the flow direction of the drilling fluid is inclined towards the entrance of the chip guiding hole 51, the drilling fluid will not / cannot all enter the chip guiding hole 51. The drilling fluid that cannot enter the chip guiding hole 51 flows along the upper end surface of the drill bit base 1 and flows out from the gaps between the cutter wings 2 and the cutting teeth 21 to fill the bottom of the wellbore being drilled. At the same time, through the arranged baffle plate 43, the drilling fluid that has passed over the entrance of the chip guiding hole 51 and failed to enter the chip guiding hole 51 can be blocked to a certain extent, so that this part of the drilling fluid re-enters the chip guiding hole 51, and thus the rock debris carried by this part of the drilling fluid also enters the chip guiding hole 51 together, increasing the number of rock debris passing through the chip guiding hole 51.

[0048] As an embodiment of the present invention, the baffle plate 43 does not contact the cone 31 and the recoil plate 4, and the baffle plate 43 is made of an elastic material;

[0049] During use, due to the cutting of the rock formation by the cone 31, the generated rock debris is relatively hard and has many sharp corners. At the same time, the rock debris carried by the drilling fluid will have a certain speed. By using an elastic material to make the baffle plate 43, the speed of the rock debris can be effectively reduced, making it easier for the rock debris to enter the chip guiding hole 51. At the same time, by using an elastic material to make the baffle plate 43, the cutting of the sharp corners on the rock debris to the baffle plate 43 can be reduced, extending the service life of the baffle plate 43.

[0050] As an embodiment of the present invention, the drill bit further includes a drill bit base body 6. A male thread 61 is provided at the lower end of the drill bit base body 6, and a standard thread is provided at one end of the drill pipe located inside the wellbore. The drill bit base body 6 is connected to the standard thread on the drill pipe through the male thread 61;

[0051] An installation cavity 621 is formed on the upper end surface of the drill bit base body 6. The drill bit base 1 is installed in the installation cavity 621. The drill bit base 1 and the drill bit base body 6 are connected by a spline. A through hole 62 is formed on the drill bit base body 6. The through hole 62 is in communication with the liquid spraying hole 5 through the installation cavity 621;

[0052] The diameter of the through hole 62 is larger than the diameter of the liquid spraying hole 5;

[0053] During drilling, after the drilling fluid conveyed through the drill pipe enters the installation cavity 621 from the through hole 62, since the diameter of the through hole 62 is larger than that of the liquid spraying hole 5, not all of the drilling fluid entering the installation cavity 621 can be discharged from the liquid spraying hole 5, so that the drilling fluid in the installation cavity 621 maintains a certain pressure. In addition, since the drill bit seat 1 is installed in the installation cavity 621 through a spline, relative movement can occur between the drill bit seat 1 and the drill bit matrix 6. Thus, under the action of the pressure of the drilling fluid in the installation cavity 621, the drill bit seat 1 moves relative to the drill bit matrix 6, that is, a certain movement gap is generated between the two. When the drill bit is under high-intensity action, it has a certain buffering and vibration reduction effect on the drill bit, reducing the impact force received by the drill bit, thereby avoiding a large impact force on the drill bit, which may cause the drill bit to break under high-intensity operation, affecting the service life of the drill bit, increasing the replacement frequency of the drill bit, affecting the normal progress of drilling, and reducing the drilling efficiency.

[0054] As an implementation manner of the present invention, a buffer ring 53 is installed on the bottom surface of the installation cavity 621. The upper end surface of the buffer ring 53 contacts the lower end surface of the drill bit seat 1. The inner diameter of the buffer ring 53 is larger than the diameter of the through hole 62, and the outer side wall of the buffer ring 53 is closely attached to the inner wall of the installation cavity 621;

[0055] During use, through the buffer ring 53, the lower end surface of the drill bit seat 1 does not contact the bottom surface of the installation cavity 621 or quickly leaves after the lower end surface of the drill bit seat 1 contacts the bottom surface of the installation cavity 621, so as to avoid the lower end surface of the drill bit seat 1 continuously contacting the bottom surface of the installation cavity 621, making the drilling fluid in the through hole 62 not easy to enter the installation cavity 621 and jack up the drill bit seat 1, generating a buffering effect. At the same time, it can also avoid the lower end surface of the drill bit seat 1 continuously contacting the bottom surface of the installation cavity 621, resulting in overload and damage of the external electric pump and liquid delivery pipeline for conveying drilling fluid. At the same time, by making the outer side wall of the buffer ring 53 closely attached to the inner wall of the installation cavity 621, the sealing effect can be improved to a certain extent, avoiding the direct leakage of the drilling fluid in the installation cavity 621 from the gap between the drill bit seat 1 and the drill bit matrix 6, so that the drilling fluid in the installation cavity 621 cannot effectively jack up the drill bit seat 1 to achieve the buffering effect and affect the service life of the drill bit.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An alloy drill bit for rock formation drilling, comprising a drill bit base (1), a cutter wing (2) is installed on the drill bit base (1), and cutting teeth (21) are evenly installed on the cutter wing (2), and it is characterized in that: A fixing seat (3) is installed on the upper end surface of the drill bit seat (1). The fixing seats (3) are distributed in a ring shape, and a cone bit (31) is installed on the fixing seat (3); A liquid spraying hole (5) is formed in the drill bit seat (1). The outlet of the liquid spraying hole (5) is located at the middle position of the fixing seats (3) distributed in a ring shape. A chip guiding hole (51) is formed in the drill bit seat (1). The inlet of the chip guiding hole (51) is located on the end surface of the drill bit seat (1), and the outlet of the chip guiding hole (51) is located on the side surface of the drill bit seat (1); The inlet of the chip guiding hole (51) surrounds the circumference of the liquid spraying hole (5), and the chip guiding hole (51) is located between the outlet of the liquid spraying hole (5) and the fixing seat (3); An installation rod (41) is installed on the end surface of the drill bit seat (1). The other end of the installation rod (41) is installed with a recoil plate (4). The height of the recoil plate (4) does not exceed the height of the cone bit (31), and the recoil plate (4) is located at the middle position of the fixing seats (3) distributed in a ring shape; The cross section of the recoil plate (4) is arc-shaped. The outlet of the liquid spraying hole (5) is directly opposite to the center position of the recoil plate (4), and the edge of the recoil plate (4) points to the inlet of the chip guiding hole (51).

2. The alloy drill bit for rock formation drilling according to claim 1, characterized in that: Attracting holes (42) are formed in the recoil plate (4). The attracting holes (42) are distributed in a circle. The cross section of the attracting hole (42) is conical, and the center line of the attracting hole (42) is perpendicular to the side surface of the recoil plate (4) facing the drill bit seat (1).

3. The alloy drill bit for rock formation drilling according to claim 1, characterized in that: A drainage groove (52) is formed on the side surface of the drill bit seat (1). The side surface of the drainage groove (52) close to the cone bit (31) is perpendicular to the center line of the drill bit seat (1), and the depth of the end of the drainage groove (52) far from the drill bit seat (1) gradually decreases; The outlet of the chip guiding hole (51) is located on the side surface of the drainage groove (52) close to the cone bit (31).

4. The alloy drill bit for rock formation drilling according to claim 1, wherein: A baffle plate (43) is installed on the upper end surface of the drill bit seat (1). The baffle plate (43) is located between the chip guiding hole (51) and the fixing seat (3).

5. The alloy drill bit for rock formation drilling according to claim 4, wherein: The baffle plate (43) does not contact the cone bit (31) and the recoil plate (4), and the baffle plate (43) is made of an elastic material.

6. The alloy drill bit for rock formation drilling according to claim 1, characterized in that: The drill bit further includes a drill bit matrix (6). A male thread (61) is provided at the lower end of the drill bit matrix (6). A standard thread is provided at one end of the drill pipe connected to the drill bit seat (1) located in the drilling well. The drill bit matrix (6) is connected to the standard thread on the drill pipe through the male thread (61); An installation cavity (621) is formed on the upper end surface of the drill bit matrix (6). The drill bit seat (1) is installed in the installation cavity (621). The drill bit seat (1) and the drill bit matrix (6) are connected by splines. A through hole (62) is formed in the drill bit matrix (6). The through hole (62) is communicated with the liquid spraying hole (5) through the installation cavity (621); The diameter of the through hole (62) is larger than the diameter of the liquid spraying hole (5).

7. The alloy drill bit for rock formation drilling according to claim 6, wherein: A buffer ring (53) is installed on the bottom surface of the installation cavity (621). The upper end surface of the buffer ring (53) contacts the lower end surface of the drill bit seat (1). The inner diameter of the buffer ring (53) is larger than the diameter of the through hole (62), and the outer side wall of the buffer ring (53) is closely attached to the inner wall of the installation cavity (621).

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