PDC (Polycrystalline Diamond Compact) drill bit with staggered blades

Abstract

The utility model relates to a blade staggered type PDC (Polycrystalline Diamond Compact) drill bit which comprises a body, a joint is arranged at the bottom of the body, the body is cylindrical, a blade group is arranged on the top surface of the body, and the blade group comprises a long blade and three short blades which are integrally formed; the long blades comprise three inner-section long blades, the three inner-section long blades are arranged in a fan-shaped radial shape, and an outer-section long blade is arranged at the tail part of each inner-section long blade; the top edges of the inner-section long blades and the outer-section long blades are arranged in a staggered mode, and a short blade is arranged between every two outer-section long blades on the top face of the body. The blade staggered type PDC drill bit has the advantages that stress is dispersed, and drilling efficiency is improved; and 2, a smoother fluid channel is provided, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits for oil and natural gas drilling, in particular to a blade-staggered PDC drill bit. Background Art

[0002] Drilling is a crucial step in the exploration and development of oil and natural gas. The drill bit is an essential tool in the geological drilling industry. Choosing the right drill bit significantly impacts drilling quality, speed, and cost.

[0003] During the oil and gas exploration and development work in deep wells, ultra-deep wells, and large-diameter well sections, traditional PDC drill bits have low rock breaking efficiency and slow mechanical drilling speed during the drilling process. Falling rock debris blocks the drill bit. At the same time, the blockage of drilling fluid and poor circulation cause incomplete heat dissipation, resulting in serious drill bit failure and a short drill bit life.

[0004] Therefore, a blade-staggered PDC drill bit is designed to solve the above problems. Summary of the Invention

[0005] In order to overcome the above shortcomings, the utility model provides a PDC drill bit with staggered blades, comprising a body, a joint being provided at the bottom of the body, the body being cylindrical, a blade assembly being provided on the top surface of the body, the blade assembly comprising an integrally formed long blade and three short blades; the long blade comprises three inner long blades, the three inner long blades being radially arranged in a fan shape, an outer long blade being provided at the tail of each inner long blade; the top edges of the inner long blade and the outer long blade are staggered, a short blade is provided between every two outer long blades on the top surface of the body;

[0006] The inner long blade wing is provided with a first cutting tooth on one side, the outer long blade wing is provided with a second cutting tooth on one side, and the short blade wing is provided with a third cutting tooth on one side;

[0007] The top surface of the body is provided with an inner nozzle, and the top surface of the body is provided with an outer nozzle; the inner nozzle and the outer nozzle pass through the upper and lower top surfaces of the body, and the inner nozzle and the outer nozzle are used for the circulation of drilling fluid;

[0008] The side walls of the main body are grooved to form a first outer flow channel and a second outer flow channel, which pass through the top and bottom surfaces of the main body from top to bottom; a notch-shaped connecting channel is provided on the top surface of the main body, and the connecting channel connects the first outer flow channel and the second outer flow channel.

[0009] Preferably, there are three inner nozzles and three outer nozzles, all of which are circular; the top surface of the body between two adjacent inner long blade wings is provided with an inner nozzle, and the top surface of the body between two adjacent outer long blade wings and short blade wings is provided with an outer nozzle.

[0010] Preferably, the line connecting the centers of the three inner nozzles can form a circle No. 1 concentric with the body; the line connecting the centers of the three outer nozzles can form a circle No. 2 concentric with the body; the diameter of circle No. 1 is smaller than the diameter of circle No. 2, and circle No. 1, circle No. 2 and the body are concentric.

[0011] Preferably, the side walls of the peripheral side of the main body on both sides of the short blade wing are grooved to form a first outer flow channel and a second outer flow channel, and a notch-shaped connecting channel is provided on the outer side of the short blade wing.

[0012] The beneficial effects of the utility model are:

[0013] The utility model discloses a PDC drill bit with staggered blades, which has the following advantages:

[0014] 1. The inner and outer long blades are staggered to encourage cuttings evacuation during drilling. Cutting teeth at different positions on the inner, outer, and short blades act on rocks at different locations, dispersing stress and improving drilling efficiency.

[0015] 2. The drilling fluid ejected from the inner and outer nozzles forms a smoother fluid channel through the connecting channel on the top surface of the body and the first and second outer flow channels on the side wall of the body, which can quickly discharge the scattered rock debris accumulated on the drill bit to obtain a clean drill bit, minimize the temperature of the tool during drilling, and extend the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a PDC drill bit with staggered blades;

[0017] Figure 2 This is a front view of a PDC drill bit with staggered blades;

[0018] Figure 3 A three-dimensional diagram of a PDC drill bit with staggered blades;

[0019] Figure 4 Schematic diagram of the arrangement of the three inner nozzles and the three outer nozzles (the center of the circle is located on the edge line of the two concentric circles);

[0020] in:

[0021] 1-body; 2-connector; 3-inner long blade; 4-outer long blade; 5-first cutting tooth; 6-second cutting tooth; 7-short blade; 8-third cutting tooth; 9-connecting channel; 10-inner nozzle; 11-outer nozzle; 12-first outer flow channel; 13-second outer flow channel; DETAILED DESCRIPTION

[0022] A PDC drill bit with staggered blades includes a body 1, a joint 2 being provided at the bottom of the body 1, the body 1 being cylindrical, and a blade assembly being provided on the top surface of the body 1, the blade assembly comprising an integrally formed long blade and three short blades 7; the long blades comprising three inner long blades 3, the three inner long blades 3 being radially arranged in a fan-shaped pattern, and an outer long blade 4 being provided at the tail of each inner long blade 3; the top edges of the inner long blades 3 and the outer long blades 4 being staggered, and a short blade 7 being provided between every two outer long blades 4 on the top surface of the body 1;

[0023] The inner long blade wing 3 is provided with a first cutting tooth 5 on one side, the outer long blade wing 4 is provided with a second cutting tooth 6 on one side, and the short blade wing 7 is provided with a third cutting tooth 8 on one side;

[0024] Three inner nozzles 10 and three outer nozzles 11 are provided, all of which are circular. An inner nozzle 10 is provided on the top surface of the body 1 between two adjacent inner long blade wings 3, and an outer nozzle 11 is provided on the top surface of the body 1 between the adjacent outer long blade wings 4 and short blade wings 7. The inner nozzles 10 and the outer nozzles 11 pass through the upper and lower top surfaces of the body 1 and are used for the circulation of drilling fluid.

[0025] The center line of the three inner nozzles 10 can form a circle No. 1 that is concentric with the body 1; the center line of the three outer nozzles 11 can form a circle No. 2 that is concentric with the body 1; the diameter of the circle No. 1 is smaller than the diameter of the circle No. 2. Figure 4 As shown, circle 1, circle 2 and body 1 are concentric.

[0026] The side walls of the main body 1 are grooved to form a first outer flow channel 12 and a second outer flow channel 13. The first outer flow channel 12 and the second outer flow channel 13 on both sides of the short blade wing 7 pass through the top and bottom surfaces of the main body 1 from top to bottom; a notch-shaped connecting channel 9 is provided on the top surface of the main body 1 outside the short blade wing 7, and the connecting channel 9 connects the first outer flow channel 12 and the second outer flow channel 13.

[0027] Directions:

[0028] In the actual operation of the drill bit, when advancing in the rock formation, the cutting teeth of a PDC drill bit with staggered blades participate in cutting. The inner long blade wing 3 and the outer long blade wing 4 adopt a staggered layout, which can stimulate the evacuation of rock chips during drilling, so that the cutting teeth at different positions on the inner long blade wing 3, the outer long blade wing 4 and the short blade wing 7 act on the rock at different positions, dispersing the stress and improving the drilling efficiency.

[0029] At the same time, thanks to the staggered structure of the blades, the drilling fluid sprayed outward from the inner nozzle 10 and the outer nozzle 11 forms a smoother fluid channel through the connecting channel 9 on the top surface of the main body 1 and the first outer flow channel 12 and the second outer flow channel 13 on the side wall of the main body 1, which can quickly discharge the scattered rock debris accumulated on the drill bit to obtain a clean drill bit, reduce the temperature of the tool during drilling as much as possible, and increase the service life of the drill bit.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A blade staggered PDC drill bit, comprising a body (1), characterized in that: The bottom of the body (1) is provided with a joint (2), the body (1) is cylindrical, and the top surface of the body (1) is provided with a knife group, the knife group includes an integrally formed long knife wing and three short knife wings (7); the long knife wing includes three inner long knife wings (3), the three inner long knife wings (3) are arranged in a fan-shaped radial shape, and an outer long knife wing (4) is provided at the tail of each inner long knife wing (3); the top edges of the inner long knife wings (3) and the outer long knife wings (4) are staggered, and a short knife wing (7) is provided between every two outer long knife wings (4) on the top surface of the body (1); A first cutting tooth (5) is provided on one side of the inner long blade wing (3), a second cutting tooth (6) is provided on one side of the outer long blade wing (4), and a third cutting tooth (8) is provided on one side of the short blade wing (7); The top surface of the body (1) is provided with an inner nozzle (10), and the top surface of the body (1) is provided with an outer nozzle (11); the inner nozzle (10) and the outer nozzle (11) pass through the upper and lower top surfaces of the body (1), and the inner nozzle (10) and the outer nozzle (11) are used for the circulation of drilling fluid; The side wall of the main body (1) is grooved to form a first outer flow channel (12) and a second outer flow channel (13), and the first outer flow channel (12) and the second outer flow channel (13) pass through the top and bottom surfaces of the main body (1) from top to bottom; a notch-shaped connecting channel (9) is provided on the top surface of the main body (1), and the connecting channel (9) connects the first outer flow channel (12) and the second outer flow channel (13).

2. The blade-staggered PDC drill bit according to claim 1, characterized in that: Three inner nozzles (10) and three outer nozzles (11) are provided, and all are circular; the inner nozzles (10) are provided on the top surface of the body (1) between two adjacent inner long blade wings (3), and the outer nozzles (11) are provided on the top surface of the body (1) between the adjacent outer long blade wings (4) and short blade wings (7).

3. The blade-staggered PDC drill bit according to claim 2, characterized in that: The center lines of the three inner nozzles (10) can form a circle No. 1 that is concentric with the body (1); the center lines of the three outer nozzles (11) can form a circle No. 2 that is concentric with the body (1); the diameter of the circle No. 1 is smaller than the diameter of the circle No. 2, and the circle No. 1, the circle No. 2 and the body (1) are concentric.

4. The blade-staggered PDC drill bit according to claim 1, characterized in that: The side walls of the main body (1) on both sides of the short blade wing (7) are grooved to form a first outer flow channel (12) and a second outer flow channel (13), and a notch-shaped connecting channel (9) is provided outside the short blade wing (7).

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