Double-stage reducing drill bit
By designing a double-stage variable diameter drill bit, increasing the number and type of cutting teeth, and improving the stability of the drill bit through nozzle design, the two-stage drill bits are solved. The drill bit has been stuck and mechanical drilling speeds in hard and heterogeneous formations. The problem is that longer lifespan and higher sizing capacity are achieved.
Patent Information
- Application Number
- CN202411861449.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-02-21
AI Technical Summary
双级钻头在硬地层,特别是具有夹层的非均质地层中,存在卡钻、机械钻速低、寿命短的问题;同时在定向井、水平井、大位移井等井型中,工具面 Unstable and difficult to increase directional tilt.
A two-stage variable diameter drill bit is designed, including a drill bit body, a connecting head, a tool wing, a first and a second stage water holes, a main cutting teeth and a secondary cutting teeth. The drill bit increases the number and type of cutting teeth through a two-stage variable diameter structure and nozzle design, and improves the stability and rock breaking ability of the drill bit.
Compared with single-stage drill bits, the life of the double-stage variable diameter drill bit has a longer life, with a 2-3-fold increase in scale capacity, an increase in mechanical drilling speed by more than 20%, and improve tool surface stability and directional tilt in heterogeneous formations. Convenience.
Smart Images
Figure CN119491655A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of roller cone drill bits, in particular to a double-stage variable diameter drill bit. Background Art
[0002] With the extensive use of single-stage drill bits, and continuous research and improvement, there is less and less room for improvement; researchers have focused their research on two-stage drill bits. Two-stage drill bits can achieve good results in soft to medium-hard formations and are widely used in drilling. However, in hard formations, especially in heterogeneous formations with interlayers, two-stage drill bits have problems such as stuck drill, low mechanical drilling speed, and short life; in directional wells, horizontal wells, large-reach wells and other well types, there are bottleneck problems such as unstable tool face and difficulty in directional inclination, which need to be solved urgently. Summary of the invention
[0003] In order to effectively solve the problems in the above-mentioned background technology, the present invention proposes a double-stage variable diameter drill bit.
[0004] The specific technical solutions are as follows:
[0005] A double-stage variable-diameter drill bit comprises a drill bit body (1), a connector (2), a blade (4), a first-stage water hole (5), a main cutting tooth (6), an auxiliary cutting tooth (7), a first-stage drill bit body (8), a second-stage drill bit body (9) and a second-stage water hole (10); the drill bit body (1) is provided with a first-stage water hole (5) and a second-stage water hole (10); the first-stage water hole (5) and the second-stage water hole (10) are connected to a water channel in the middle of the drill bit body (1); fixed nozzles or replaceable nozzles are installed on the first-stage water hole (5) and the second-stage water hole (10) near the top of the first-stage drill bit body (8) and the bottom of the drill bit body (9); the nozzle of the first-stage drill bit body (8) faces the bottom of the drill bit body, and the nozzle of the second-stage drill bit body (9) faces the side of the drill bit body; the blade (8) comprises a main tooth composite piece (6) and an auxiliary tooth composite piece (7).
[0006] Preferably, the auxiliary tooth composite plate (7) is 0.5-1 mm lower in height than the main tooth composite plate (6).
[0007] Preferably, the rearward inclination angle of the main tooth composite plate (6) and the auxiliary tooth composite plate (7) is between 17 and 32 degrees;
[0008] Preferably, the diameter of the first-stage drill bit body (8) is 120 mm, and the diameter of the second-stage drill bit body (9) is 152.4 mm;
[0009] Preferably, the first-stage drill bit body (8) has three blades, and the second-stage drill bit body (9) has six blades;
[0010] Preferably, the crown profiles of the first-stage drill bit body (8) and the second-stage drill bit body (9) are both short parabolas.
[0011] Preferably, the blades are brazed with passive gauge teeth.
[0012] Preferably, the blade wings are brazed with undercut eye teeth.
[0013] Compared with the prior art, the beneficial effects of the present invention are: the drill bit of the utility model can arrange more main cutting teeth than the single-stage drill bit, so that the drill bit has a longer service life, and the drill bit penetration is 2-3 times that of the single-stage drill bit;
[0014] The drill bit of the utility model can be equipped with more auxiliary cutting teeth than a single-stage drill bit, which increases the service life of the drill bit and can better protect the welding layer, thereby increasing the maintenance frequency of the drill bit;
[0015] The two-stage drill bit of the utility model breaks the rock twice, which can effectively destroy the internal stress of the rock and increase the mechanical drilling speed of the drill bit by more than 20%;
[0016] The two-stage drill bit of the utility model has better stability during the drilling process, can effectively prevent the composite piece from breaking teeth in rocks with cracks and mixed layers, and increases the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the overall structure of this embodiment;
[0018] Figure 2 The distance dimension on the right is a schematic diagram of the height difference between the main gear and the auxiliary gear;
[0019] In the figure: 1. drill body; 2. connector; 3. first chip groove; 4. blade; 5. first-stage water hole; 6. main cutting tooth; 7. auxiliary cutting tooth; 8. first-stage drill body; 9. second-stage drill body; 10. water hole; 11. second chip groove. DETAILED DESCRIPTION
[0020] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.
[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings and preferred embodiments. Figure 1 As shown, the present invention proposes a double-stage variable diameter drill bit, including a drill bit body 1, a first-stage drill bit body 8, a second-stage drill bit body 9, a connector 2, a blade 4, a first-stage chip removal groove 3, a second-stage chip removal groove 11, a first-stage water hole 5, a second-stage water hole 10, a main cutting tooth 6, and an auxiliary cutting tooth 7; the drill bit body 1 is provided with a water hole 510, and the water hole 510 is connected with the water channel in the middle of the drill bit body 1, and the water hole 510 near the top 8 and the bottom 9 of the drill bit body is installed with a fixed nozzle or a replaceable nozzle, the nozzle of the top 8 of the drill bit body faces the bottom of the drill bit body, and the nozzle of the bottom 9 of the drill bit body faces the side of the drill bit body, and the nozzles on the water holes at both ends of the drill bit body are arranged in opposite directions, so that the well wall can be sprayed. The debris on the surface can be washed away, and the dirt in the chip groove can also be washed away to prevent the occurrence of mud packing. The spray angle of the nozzle points to the chip groove. The replaceable nozzle is threadedly connected to the water hole. The nozzle is provided with a nozzle sleeve and a sealing ring in sequence. The inner diameter of the nozzle spray port is 8-13mm. The nozzle is a nozzle of the prior art. The sealing ring and can prevent water leakage. If the inner diameter of the nozzle spray port is too small, it is easy to block the water hole. If it is too large, the impact force is insufficient and it cannot be thoroughly cleaned. The blade wing 8 includes a main tooth composite piece 6 and a secondary tooth composite piece 7. The secondary tooth composite piece 7 is 0.5-1mm lower than the main tooth composite piece 6. The back angle of the composite piece 67 is between 17 and 32 degrees. The diameter of the first-stage drill body is 120mm, and the diameter of the second-stage drill body is 152.4mm; the first-stage drill body has 3 blade wings, and the second-stage drill body has 6 blade wings; the crown profiles of the first-stage and second-stage drill bodies are both short parabolas. The blade wings are all brazed with passive gauge teeth. The blade wings are all brazed with undercut eye teeth.
[0022] 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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A two-stage variable diameter drill bit, characterized in that: The drill bit comprises a drill body (1), a connector (2), a blade (4), a first-stage water hole (5), a main cutting tooth (6), an auxiliary cutting tooth (7), a first-stage drill body (8), a second-stage drill body (9) and a second-stage water hole (10); the drill bit body (1) is provided with a first-stage water hole (5) and a second-stage water hole (10); the first-stage water hole (5) and the second-stage water hole (10) are connected to a water channel in the middle of the drill bit body (1); fixed nozzles or replaceable nozzles are installed on the first-stage water hole (5) and the second-stage water hole (10) near the top of the first-stage drill bit body (8) and the bottom of the drill bit body (9); the nozzle of the first-stage drill bit body (8) faces the bottom of the drill bit body, and the nozzle of the second-stage drill bit body (9) faces the side of the drill bit body; the blade (8) comprises a main tooth composite piece (6) and an auxiliary tooth composite piece (7).
2. The double-stage variable diameter drill bit according to claim 1, characterized in that: The auxiliary tooth composite plate (7) is 0.5-1 mm lower in height than the main tooth composite plate (6).
3. The double-stage variable diameter drill bit according to claim 1, characterized in that: The rearward tilt angle of the main tooth composite plate (6) and the auxiliary tooth composite plate (7) is between 17 and 32 degrees; 4. The double-stage variable diameter drill bit according to claim 1, characterized in that: The diameter of the first-stage drill bit body (8) is 120 mm, and the diameter of the second-stage drill bit body (9) is 152.4 mm; 5. The double-stage variable diameter drill bit according to claim 1, characterized in that: The first-stage drill bit body (8) has three blades, and the second-stage drill bit body (9) has six blades; 6. The double-stage variable diameter drill bit according to claim 1, characterized in that: The crown profiles of the first-stage drill bit body (8) and the second-stage drill bit body (9) are both short parabolas.
7. The double-stage variable diameter drill bit according to claim 1, characterized in that: The blades are all brazed with passive gauge teeth.
8. The double-stage variable diameter drill bit according to claim 1, characterized in that: The blade wings are all brazed with inverted eye teeth.