A high-strength wear-resistant drill bit

Abstract

The present invention relates to the field of drill bits, and in particular to a high-strength wear-resistant drill bit, comprising a rod and a crown welded as one, the crown comprising blades and water holes; the blades comprising four main blades and two side blades, a circle of protrusions is provided at the connection between the crown and the rod, a reverse scoring structure is provided on the protrusion, a composite sheet is welded close to the reverse scoring structure in the direction of the crown, the contour curve of the composite sheet is in an arc shape, and the crown of the composite sheet is in an elliptical shape, which solves the technical defects of high wear, low life and easy drill jamming in the existing technical problems. The present invention provides a drill bit with wear resistance, high life and not easy drill jamming performance.

Description

Technical Field

[0001] The invention relates to the field of drill bits, and in particular to a high-strength wear-resistant drill bit. Background Art

[0002] In the drilling process and technology chain, the drill bit has always been at the forefront and core. The essence of drilling is to break rocks. Other drilling technologies, such as information, control, and mud, are all serving the purpose of breaking rocks. Although the drill bit is the first choice, it does not mean that the importance of other aspects should be reduced. The spatial structural parameters of the cutting teeth of the drill bit composite piece directly affect the crushing effect of the drill bit. The inclination angle of the composite piece is also one of the spatial structural parameters. When drilling in soft or medium-hard formations, the drill bit has the advantages of high drilling speed and long drilling life; however, in the process of drilling in medium-hard abrasive formations and hard formations, it has the defects of high wear and short service life; in some special cases, such as when there is a depression in the underground layer, the drill will be stuck, resulting in delays in the construction period and even serious accidents such as ground collapse. Summary of the invention

[0003] Aiming at the technical defects of high wear, low life and easy drill sticking in the prior art, the present invention provides a new high-strength wear-resistant drill bit, which has the performance of wear resistance, high life and not easy to get stuck.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A high-strength wear-resistant drill bit, comprising a drill bit, the drill bit comprising a rod portion and a crown portion welded as one, the crown portion comprising blades and water holes; the blades comprising four main blades and two side blades, the main blades comprising a main blade A, a main blade B, a main blade C and a main blade D, the side blades comprising a side blade A and a side blade B, the top of the crown portion being evenly arranged according to the main blade A, the main blade B, the side blade A, the main blade C, the main blade D and the side blade B; the cutting surfaces of the main blade and the side blade are in an arc shape, and the arc shape extends to the outside of the drill bit. The deviation direction of one side of the circle is opposite to the rotation direction of the drill bit; the blade is evenly provided with cutting teeth, the cutting teeth are cylindrical, and the angle between the cutting teeth and the center line of the drill bit is α, α is 35°-60°; the side of the blade is provided with a gauge section, and the gauge section is provided with gauge teeth; the water hole is provided in the groove between each blade and on the blade, and the water hole is connected with the water channel in the middle of the drill body; the side blade is provided between the two main blades, which increases the stability of the crown during rotation and reduces the centrifugal force caused by uneven mass distribution;

[0006] A circle of protrusions is provided at the connection between the crown and the rod, and an inverted eye structure is provided on the protrusion. The inverted eye structure is welded with a composite sheet close to the crown. The contour curve of the composite sheet is arc-shaped, the crown of the composite sheet is elliptical, the edge groove pressure angle of the composite sheet is 30°, and the radius of the transition fillet at the bottom of the composite sheet is 1.4 cm.

[0007] As a further improvement, the reverse scoring structure is sharp teeth, and the sharp teeth are all inclined in the opposite direction to the center line of the drill bit. The arrangement in the opposite direction effectively reduces the drill sticking situation when the drill bit is working underground.

[0008] As a further improvement, the crown of the composite piece is elliptical, and the distance from the center of the circle to the top of the crown is the short semi-axis. The length of the short semi-axis is 0.4 times the long semi-axis. Different values ​​of the inclination angle of the composite piece will cause significant changes in the wear of the composite piece on the drill bit. Setting the contour of the crown of the composite piece to an elliptical shape effectively reduces wear during drilling work compared to the traditional cylindrical shape.

[0009] As a further improvement, the connection transition between the crown and the rod is in an arc shape, and the fillet radius of the connection is 1 / 3 of the radius of the center line of the drill bit. The rod is a cylindrical structure that is wide at the top and narrow at the bottom. The angle between the rod and the crown is 60°-70°. A bevel is retained at the connection transition between the rod and the crown. Compared with traditional right-angle connections, the edges are easily worn during underground operations. The bevel reduces friction and reduces wear during high-speed rotation of the drill bit.

[0010] As a further improvement, the top side surfaces of the main blades are provided with inverted eyelet structures, which can increase the number of inverted eyelet structures while keeping the overall length of the drill bit unchanged, effectively reducing the drill bit getting stuck in wellbores that are prone to shrinkage. The drill bit can be lifted up through the inverted eyelet structures, making it less likely to get stuck.

[0011] As a further improvement, a nozzle is arranged on the water hole arranged in the groove, the nozzle is threadedly connected to the water hole, and a nozzle sleeve, a sealing ring and a buffer pad are arranged in the nozzle in sequence.

[0012] As a further improvement, a layer of alloy powder is sprayed on the outer layer of the drill bit, thereby increasing the corrosion resistance and wear resistance of the drill bit.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] Effect 1: The blades in the present invention include four main blades and two side blades, which are evenly arranged at the top of the crown of the drill bit according to the main blade A, main blade B, side blade A, main blade C, main blade D and side blade B. The side blade is arranged between the two main blades, and the stability of the crown of the drill bit during high-speed rotation is ensured without increasing the overall mass of the drill bit, so that the overall mass distribution of the drill bit is uniform. As the angular velocity increases, the rotation speed of the drill bit also increases, and the torque is basically linearly distributed, which reduces the centrifugal force caused by the uneven mass distribution when the drill bit rotates at high speed;

[0015] Effect 2: Cutting teeth are evenly arranged on the blade, and the cutting teeth are cylindrical. The angle between the cutting teeth and the center line of the drill bit is α, and α is 35°-60°. The cutting teeth mainly rotate around the axis of the drill bit and move downward with the drill bit at the bottom of the well. As the angle between the cutting teeth and the center line of the drill bit increases, the blade inclination angle and the effective cutting edge length also increase, while the cutting area and the cutting arc length decrease. The wear ratio of the composite sheet increases with the increase of the bevel angle, and the volume wear of the composite sheet decreases accordingly, which increases the wear resistance of the drill bit to a certain extent.

[0016] Effect three: a circle of protrusions is provided at the connection between the crown and the rod, and an inverted eye structure is provided on the protrusion. The inverted eye structure is welded with a composite sheet close to the direction of the crown, and the contour curve of the composite sheet is arc-shaped. The inverted eye structure is sharp teeth, and the sharp teeth are all inclined in the opposite direction of the drill center line. The arrangement in the opposite direction effectively reduces the drill bit getting stuck when working underground, and the drill bit can be lifted up through the inverted eye structure to save effort; and the inverted eye and the composite sheet are arranged close together. In the case of drill getting stuck, the composite sheet can protect the inverted eye structure and the gauge teeth to continue the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structural diagram of the drill bit;

[0018] Figure 2 Schematic diagram of the drill crown structure;

[0019] Figure 3 It is the side view of the drill bit;

[0020] Figure 4 It is the structural diagram of the composite sheet;

[0021] In the figure, 1-rod, 2-crown, 3-blade, 4-water hole, 5-cutting tooth, 6-gauge protection section, 7-gauge protection tooth, 8-main blade A, 9-main blade B, 10-side blade A, 11-main blade C, 12-main blade D, 13-side blade B, 14-water channel, 15-composite sheet, 16-protrusion, 17-inverted eye structure. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0026] Example

[0027] The present embodiment provides a high-strength wear-resistant drill bit, including a drill bit, the drill bit including a rod portion 1 and a crown portion 2 welded as one, the crown portion 2 including blades 3 and a water hole 4; the blades 3 including four main blades and two side blades, the main blades including main blades A8, main blades B9, main blades C11 and main blades D12, the side blades including side blades A10 and side blades B13, the top of the crown portion 2 is evenly arranged according to the main blades A8, main blades B9, side blades A10, main blades C11, main blades D12 and side blades B13, the distances between the blades are equal, the stability of the crown during high-speed rotation makes the overall mass distribution of the drill bit even, as the angular velocity increases, the rotation speed of the drill bit also increases, the torque base The main blade 3 is linearly distributed, which reduces the centrifugal force caused by the uneven mass distribution when the drill bit rotates at high speed; the contours of the cutting surfaces of the main blade and the side blade are arc-shaped, and the deviation direction of the arc to the outer circle of the drill bit is opposite to the rotation direction of the drill bit; the blade 3 is evenly provided with cutting teeth 5, and the cutting teeth 5 are cylindrical. The angle between the cutting teeth 5 and the center line of the drill bit is α, and α is 35°-60°. As the angle between the cutting teeth and the center line of the drill bit increases, the blade inclination angle and the effective cutting edge length also increase, while the cutting area and the cutting arc length decrease. The wear ratio of the composite sheet increases with the increase of the bevel angle, and the volume wear of the composite sheet decreases accordingly, which increases the wear resistance of the drill bit to a certain extent. After experimental testing, α is 35°-60° The wear on the composite sheet is smaller, and the distribution of the cutting teeth closer to the center of the drill bit is denser; the side of the blade wing 3 is provided with a gauge section 6, and the gauge section 6 is provided with a gauge tooth 7; the water hole 4 is provided in the groove between the blade wings 3 and on the blade wing 3, and the water hole 4 is connected to the water channel 14 in the middle of the drill body; a circle of protrusions 16 is provided at the connection between the crown 2 and the rod 1, and a reverse eye structure 17 is provided on the protrusion 16, and the reverse eye structure 17 is a sharp tooth. The outer layer of the drill bit is sprayed with a layer of alloy powder, which increases the corrosion resistance and wear resistance of the drill bit. The sharp teeth are all inclined in the opposite direction of the center line of the drill bit. The arrangement in the opposite direction effectively reduces the jamming of the drill bit when the drill bit works underground. The drill bit is lifted by the reverse eye structure, which saves effort. The inverted eye structure 17 is welded closely to the crown direction with a composite sheet 15, the contour curve of the composite sheet 15 is arc-shaped, the crown of the composite sheet 15 is elliptical, the edge groove pressure angle of the composite sheet 15 is 30°, the radius of the transition fillet at the bottom of the composite sheet 15 is 1.4 cm, the crown of the composite sheet 15 is elliptical, and the short semi-axis is from the center of the circle to the top of the crown, and the length of the short semi-axis is 0.4 times the long semi-axis. The top side of the main blade is provided with an inverted eye structure, and the inverted eye and the composite sheet are arranged closely together. In the case of drill jamming, the composite sheet can protect the inverted eye structure and the gauge tooth and continue to operate. As the inclination angle α increases, the friction force on the edge of the composite sheet decreases, and the volume wear decreases, that is, the service life of the composite sheet is extended.

[0028] Specifically, the connection transition between the crown 2 and the rod 1 is arc-shaped, and the fillet radius of the connection is 1 / 3 of the radius of the drill centerline. The rod 1 is a cylindrical structure that is wide at the top and narrow at the bottom, and the angle between the rod 1 and the crown 2 is 60°-70°.

[0029] Specifically, a nozzle is arranged on the water hole 4 arranged in the groove, the nozzle is threadedly connected to the water hole 4, and a nozzle sleeve, a sealing ring and a buffer pad are arranged in the nozzle in sequence.

[0030] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A high-strength wear-resistant drill bit, comprising a drill bit, wherein the drill bit comprises a rod portion (1) and a crown portion (2) welded together, It is characterized in that The crown (2) comprises a blade (3) and a water hole (4); the blade (3) comprises four main blades and two side blades, the main blades comprising a main blade A (8), a main blade B (9), a main blade C (11) and a main blade D (12), the side blades comprising a side blade A (10) and a side blade B (13), the top of the crown (2) being evenly arranged according to the main blade A (8), the main blade B (9), the side blade A (10), the main blade C (11), the main blade D (12) and the side blade B (13); the cutting surfaces of the main blade and the side blade are in the shape of an arc, and the deviation direction of the arc to the outer circle of the drill bit is opposite to the rotation direction of the drill bit; the blade (3) is evenly provided with cutting teeth (5), the cutting teeth (5) are cylindrical, and the angle between the cutting teeth (5) and the center line of the drill bit is " , " of 35°-60°; The side of the blade (3) is provided with a gauge section (6), and the gauge section (6) is provided with a gauge tooth (7); the water hole (4) is provided in the groove between each blade (3). The water hole (4) on the groove and the blade (3) is connected to the water channel (14) in the middle of the drill body; A circle of protrusions (16) is provided at the connection between the crown (2) and the rod (1), and an inverted eye structure (17) is provided on the protrusion (16). The inverted eye structure (17) is welded closely to a composite sheet (15) in the direction of the crown, and the contour curve of the composite sheet (15) is in the shape of an arc. The crown of the composite sheet (15) is in the shape of an ellipse. The pressure angle of the blade groove of the composite sheet (15) is 30°, and the radius of the transition fillet at the bottom of the composite sheet (15) is 1.4 cm. The inverted eye structure (17) is a sharp tooth, and the sharp teeth are all inclined in the opposite direction to the center line of the drill bit. The crown of the composite sheet (15) is in the shape of an ellipse, and the distance from the center of the circle to the top of the crown is a short semi-axis, and the length of the short semi-axis is 0.4 times the long semi-axis.

2. The high-strength wear-resistant drill bit according to claim 1, It is characterized in that The crown (2) and the shaft (1) The connection transition is in an arc shape, and the fillet radius of the connection is 1 / 3 of the radius of the drill centerline.

3. The high-strength wear-resistant drill bit according to claim 2, It is characterized in that The rod (1) is wide at the top and narrow at the bottom. Cylindrical structure.

4. The high-strength wear-resistant drill bit according to claim 1, It is characterized in that The top side surfaces of the main blades are both provided with It has an inverted eye structure.

5. The high-strength wear-resistant drill bit according to claim 1, It is characterized in that The water hole (4) provided in the groove A nozzle is arranged on the top, the nozzle is threadedly connected to the water hole (4), and a nozzle sleeve, a sealing ring and a buffer pad are arranged in sequence in the nozzle.

6. The high-strength wear-resistant drill bit according to claim 1, It is characterized in that The outer layer of the drill bit is sprayed with a layer of alloy powder.

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