Concentric casing drilling tool

Abstract

The utility model provides a concentric casing drilling tool. The concentric casing drilling tool comprises a rod stabilizer, a central drill bit, a rotor wing and a pipe shoe, one end of the rod stabilizer is rotatably clamped in the center drill bit through a clamping structure, the pipe shoe is arranged at the joint of the center drill bit and the rod stabilizer in a sleeved mode, arc-shaped limiting blocks which are diverged outwards from the axis to the circumferential face are arranged on the lower end face of the rod stabilizer and correspond to the opening, and arc-shaped sliding grooves are formed in the rotor wings and correspond to the arc-shaped limiting blocks. The rotor wings are clamped to the rod stabilizer through matching of the arc-shaped limiting blocks and the arc-shaped sliding grooves, openings for the rotor wings to penetrate through are formed in the positions, corresponding to the rotor wings, of the center drill bit in the circumferential radial direction, and the rotor wings can be driven to stretch out and retract from the openings of the center drill bit through rotation of the rod stabilizer. According to the utility model, the arc-shaped limiting block is matched with the arc-shaped sliding chute, so that the stable unfolding and folding of the rotor wing in the drilling process are ensured, the possible shaking of the traditional wing block type drilling tool is reduced, and the stability and the reliability of the drilling tool are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of drilling tools, especially to a concentric follow-up pipe drilling tool. BACKGROUND

[0002] The follow-up pipe drilling tool is designed for the difficulty of hole forming when drilling in loose soil complex strata such as river pebbles and karst caves. This drilling tool leads the steel pipe (casing) into the strata at the same time when drilling, so that the strata will not be filled, and after the hole is formed, the drill bit is used to excavate to meet the drilling requirements. It is widely used in excavation construction of infrastructure, farmland irrigation, domestic water, oil exploitation, etc. There are many forms of traditional follow-up pipe drilling tools. The existing three-wing concentric drilling tool is composed of a center drill bit, a stabilizer, a wing block and a locking system. The wing block is usually set between the center drill bit and the stabilizer in multiple pieces, and is locked by the locking system (using a cross pin + split pin form). When the drilling tool is not in working state, the wing block is in a closed state. When working, the wing block is extended due to the pressure of the strata on the center drill bit (or wing block) contacting the ground, achieving the purpose of drilling and following up. However, the current wing block type concentric drilling tool is prone to falling off and failure due to wear and vibration of the drilling tool locking system during use, causing the wing block and center drill bit to fall off, or the drilling tool to be stuck or the wing block and center drill bit to be broken due to changes in the strata, and the stabilizer to crack, resulting in the abandonment of the wellhead.

[0003] A three-wing concentric follow-up pipe drilling tool is disclosed in the prior art CN202221419638.5, which comprises a center drill bit, a stabilizer and a locking pin assembly. Three wing blocks are evenly distributed in the circumferential direction at one end of the stabilizer. The center drill bit limits the radial position of the wing blocks after being inserted into the stabilizer, so that the wing blocks fit tightly and do not swing. The center drill bit is connected with the stabilizer by the locking pin assembly. Although this utility model improves the connection between the center drill bit and the stabilizer to prevent the wing blocks from falling off, it still has the following problems:

[0004] 1. The wing blocks and the center drill bit of this utility model are still connected by a shaft. Although the new locking pin assembly improves stability, long-term work can cause wear and vibration, which may affect the reliability and stability of the locking system, and further cause the wing blocks and the center drill bit to fall off.

[0005] 2. The utility model expands the wing blocks outward by pressure. When the gap between the wing blocks and the drill bit is large, especially in soft or loose strata, mud is easily stuck in the gap, which not only reduces the drilling efficiency, but also may cause the wing blocks to be unable to fully close, affecting the removal of the center drill bit. SUMMARY

[0006] Therefore, the concentric follow-up pipe drilling tool is provided, the cooperation of the arc-shaped limiting blocks and the arc-shaped sliding grooves is adopted, the stable unfolding and retracting of the rotors in the drilling process are ensured, the shaking of the traditional wing block type drilling tool is reduced, and the stability and reliability of the drilling tool are improved.

[0007] The utility model discloses a technical scheme that solves the technical problems:

[0008] Provide a kind of concentric follow-up pipe drilling tool, comprising: stabilizer, center drill, rotor and pipe shoe;The one end of the stabilizer is rotatably clamped in center drill by clamping structure, the pipe shoe is set in the junction of center drill and stabilizer,

[0009] Corresponding opening is equipped with arc-shaped limiting block from axis to the circular surface on the lower end surface of the stabilizer, corresponding arc-shaped limiting block is equipped with arc-shaped sliding groove on the rotor, the rotor is clamped on the stabilizer by the cooperation of arc-shaped limiting block and arc-shaped sliding groove, and arc-shaped limiting block is moved in arc-shaped sliding groove by the rotation of stabilizer, the opening for rotor to pass through is set on the center drill along the circumferential radial direction corresponding rotor, and rotor can be driven to extend and retract from the opening of center drill by the rotation of stabilizer.

[0010] It should be noted that, since arc-shaped limiting block is from the axis of stabilizer to the circular surface, arc-shaped limiting block cannot completely separate from the sliding groove of rotor, can effectively prevent the falling of rotor, is connected by clamping structure and center drill, allows relative rotation between the two, and ensures the stable unfolding and retracting of rotor in the drilling process by the cooperation of arc-shaped limiting block and arc-shaped sliding groove, reduces the shaking that can occur to traditional wing block type drilling tool.

[0011] Preferably, the opening is three, and is evenly distributed in the circumferential direction of center drill, the end of the stabilizer is provided with three arc-shaped arc-shaped blocks, and the rotor is arranged in the three openings and connected with the corresponding arc-shaped limiting blocks.

[0012] It should be noted that, rotor can be simultaneously unfolded and retracted, the layout of three rotors makes the load of drilling tool more balanced in the drilling process, improves the overall stability and service life of drilling tool, and rotor can adjust the effective diameter of drilling tool according to actual needs, suitable for various geological conditions.

[0013] Preferably, the clamping structure comprises a clamping ring and a clamping groove, the clamping groove is arranged on the outer wall of the stabilizer along the circumferential direction of the stabilizer, the inner wall of the center drill is provided with a positioning groove corresponding to the clamping groove, the clamping ring is clamped in the clamping groove, and the rotatable connection of the stabilizer and the center drill can be realized by the cooperation of the positioning groove and the clamping groove.

[0014] It should be noted that the cooperation of the snap ring and the snap groove enables the stabilizer to rotate in the center drill bit, thereby realizing the unfolding and folding of the rotor. Through the cooperation of the snap ring and the snap groove, and the design of the positioning groove, the stable connection between the stabilizer and the center drill bit is ensured, and even in the drilling process, a good connection state can be maintained.

[0015] Preferably, a latch hole is arranged on the upper end outer wall of the center drill bit corresponding to the positioning groove, and a fixed pin is arranged in the latch hole in an interference fit. The fixed pin is clamped in the snap groove through the latch hole.

[0016] It should be noted that the interference fit means that the fixed pin and the latch hole are in close cooperation, which ensures that the fixed pin is firmly fixed in the latch hole and avoids loosening of the fixed pin due to vibration during drilling; the fixed pin is not only connected with the center drill bit through the latch hole, but also clamped in the snap groove through the latch hole, thereby firmly connecting the center drill bit and the stabilizer together, ensuring the stable relative position of the two, preventing the center drill bit from falling off the stabilizer, and allowing relative rotation between them.

[0017] Preferably, the snap ring is composed of at least two circular arc segments, and the fixed pin is clamped in the gap between adjacent circular arc segments.

[0018] It should be noted that the snap ring is composed of at least two circular arc segments, and the fixed pin is clamped in the gap between adjacent circular arc segments, which enhances the stability of the connection, reduces the reliability problems caused by wear and vibration, improves the stability and reliability of the drilling tool, reduces the shaking problem that may occur in the traditional wing block type drilling tool, and thus improves the overall performance of the drilling tool.

[0019] Preferably, limit holes are arranged on both sides of the fixed pin along the axis of the latch hole, the axis of the limit hole is perpendicular to the axis of the stabilizer, the middle part of the limit hole intersects with the latch hole, a limit pin is arranged in the limit hole, a limit groove is arranged on the fixed pin corresponding to the limit pin, and the limit pin can prevent the fixed pin from sliding out of the latch hole through cooperation with the limit groove.

[0020] It should be noted that the design of the limit hole ensures that the fixed pin can be accurately fixed in the latch hole, and when the drilling tool is subjected to external force, the fixed pin can be effectively prevented from sliding out of the latch hole. The limit pin, through cooperation with the limit groove on the fixed pin, has a double locking effect, which ensures that the position of the fixed pin will not change due to vibration during the working process of the drilling tool. This design not only strengthens the connection between the center drill bit and the stabilizer, but also improves the overall stability and reliability of the drilling tool, especially during the drilling process, which can better resist the displacement or damage of parts caused by vibration or external force.

[0021] Preferably, the rotor is made of high-strength material.

[0022] It should be noted that the high-strength material can be a hard alloy sintered from tungsten carbide particles and cobalt binder commonly used in existing drill bits, diamond, etc. The selection of high-strength material is to ensure that the rotor can maintain sufficient strength and durability when subjected to high load and impact during drilling. The rotor made of high-strength material can better cope with different types of rock strata and improve the stability and efficiency of the drilling tool during drilling.

[0023] The utility model discloses the beneficial effects of:

[0024] The utility model provides a concentric follow -up pipe drilling tool, through the cooperation of arc limit piece and arc slide, ensure that the rotor is stable to spread and retract in the process of drilling, has reduced the possible shaking of traditional wing block type drilling tool, the layout of three rotors makes the drilling tool more balanced in the process of drilling, improves the overall stability and service life of the drilling tool, the cooperation of snap ring and card slot makes that the steady pole ware can rotate in the center drill, through the cooperation of snap ring and card slot, plus the design of positioning groove, guarantee the stable connection between steady pole ware and center drill, even in the process of drilling, can keep good connection state under the vibration, the cooperation of fixed pin and limit pin can play the effect of double locking, ensure that the relative position between steady pole ware and center drill does not change because of the vibration of drilling tool in the working process, the selection of high-strength material ensures that the rotor can maintain sufficient strength and durability when subjected to high load and impact during drilling, improves the overall performance of the drilling tool. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic view of a concentric follow -up pipe drilling tool of the utility model embodiment 1.

[0026] Figure 2 It is a connection three-dimensional schematic view of steady pole ware and center drill of the utility model embodiment 1.

[0027] Figure 3 It is a sectional view of a concentric follow -up pipe drilling tool of the utility model embodiment 1.

[0028] Figure 4 It is the internal connection structure schematic view of a concentric follow -up pipe drilling tool of the utility model embodiment 1.

[0029] Figure 5 It is a three-dimensional structure schematic view of center drill of the utility model embodiment 1.

[0030] Figure 6 It is the connection structure schematic view of steady pole ware and arc limit piece of the utility model embodiment 1.

[0031] Figure 7 It is the three-dimensional structure schematic view of the rotor of the utility model embodiment 1.

[0032] Figure 8 It is the snap ring structure schematic view of the utility model embodiment 1.

[0033] In the drawing: 1, stabilizer; 2, center drill bit; 21, opening; 3, rotor; 31, arc-shaped sliding groove; 4, pipe shoe; 5, arc-shaped limiting block; 6, clamping structure; 61, snap ring; 62, clamping groove; 63, positioning groove; 7, bolt hole; 8, fixed pin; 81, limiting groove; 9, limiting hole; 10, limiting pin.

[0034] It should be noted that these drawings and textual descriptions do not indicate in any way limit the concept range of the utility model, but through reference to specific embodiments illustrate the concept of the utility model for those skilled in the art. DETAILED DESCRIPTION

[0035] The technical solutions in the utility model embodiments will be clearly and completely described below in conjunction with the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0036] Embodiment 1

[0037] As shown in Figures 1-8 A concentric pipe drill tool, comprising: stabilizer 1, center drill bit 2, rotor 3 and pipe shoe 4; one end of the stabilizer 1 is rotatably clamped in the center drill bit 2 through the clamping structure 6, the pipe shoe 4 is sleeved at the intersection of the center drill bit 2 and the stabilizer 1,

[0038] The lower end face of the stabilizer 1 is provided with arc-shaped limiting blocks 5 corresponding to the openings 21 and diverging from the axis to the circumferential surface, the rotor 3 is provided with arc-shaped sliding grooves 31 corresponding to the arc-shaped limiting blocks 5, the rotor 3 is clamped on the stabilizer 1 through the cooperation of the arc-shaped limiting blocks 5 and the arc-shaped sliding grooves 31, and the arc-shaped limiting blocks 5 are moved in the arc-shaped sliding grooves 31 through the rotation of the stabilizer 1, the center drill bit 2 is provided with openings 21 corresponding to the rotor 3 along the circumferential radial direction, the rotor 3 passes through the openings 21, and the rotor 3 can be extended and retracted from the openings 21 of the center drill bit 2 through the rotation of the stabilizer 1.

[0039] The openings 21 are three and uniformly distributed in the circumferential direction of the center drill bit 2, the end of the stabilizer 1 is provided with three arc-shaped limiting blocks corresponding to the uniform distribution, the rotor 3 is correspondingly arranged in the three openings 21, and is connected with the corresponding arc-shaped limiting blocks 5 respectively.

[0040] The clamping structure 6 comprises a clamping ring 61 and a clamping groove 62, the clamping groove 62 is arranged on the outer wall of the stabilizer 1 along the circumferential direction of the stabilizer 1, the inner wall of the center drill bit 2 is provided with a positioning groove 63 corresponding to the clamping groove 62, the clamping ring 61 is clamped in the clamping groove 62, and the rotatable connection of the stabilizer 1 and the center drill bit 2 can be realized by cooperation of the positioning groove 63 and the clamping groove 62.

[0041] The upper end outer wall of the center drill bit 2 is provided with a latch hole 7 corresponding to the positioning groove 63, the latch hole 7 is provided with a fixed pin 8 in interference fit, and the fixed pin 8 is clamped in the clamping groove 62 through the latch hole 7.

[0042] The clamping ring 61 is composed of at least two circular arc segments, and the fixed pin 8 is clamped in the gap between adjacent circular arc segments.

[0043] The fixed pin 8 is provided with a limiting hole 9 on both sides along the axial direction of the latch hole 7, the axial direction of the limiting hole 9 is perpendicular to the axial direction of the stabilizer 1, the middle part of the limiting hole 9 intersects with the latch hole 7, the limiting hole 9 is provided with a limiting pin 10, the fixed pin 8 is provided with a limiting groove 81 corresponding to the limiting pin 10, and the limiting pin 10 can prevent the fixed pin 8 from sliding out of the latch hole 7 by cooperating with the limiting groove 81.

[0044] The rotor 3 is made of high-strength material.

[0045] The working principle and use method of the concentric follow-up pipe drilling tool of the embodiment are as follows:

[0046] The embodiment provides a concentric follow-up drilling tool, a stabilizer 1 is located at the center position of the drilling tool, one end is connected with a center drill bit 2 through a clamping structure 6 and can rotate relative to the center drill bit 2, the clamping structure 6 is composed of a clamping ring 61 and a clamping groove 62, the clamping ring 61 is clamped in the clamping groove 62 and realizes the rotatable connection of the stabilizer 1 and the center drill bit 2 by cooperation of a positioning groove 63 and the clamping groove 62; the center drill bit 2 serves as a front end part of the drilling tool and is responsible for actual drilling work; the inner wall of the center drill bit 2 is provided with the positioning groove 63 and is used for cooperating with the clamping groove 62 of the stabilizer 1, the rotatable connection between the stabilizer 1 and the center drill bit 2 is realized through cooperation of the positioning groove 63 and the clamping groove 62, the upper end outer wall of the center drill bit 2 is provided with a latch hole 7, a fixed pin 8 is arranged in the latch hole 7 in an interference fit, passes through the latch hole 7 and is clamped in the clamping groove 62, so that the stable connection of the stabilizer 1 and the center drill bit 2 is ensured and the stabilizer 1 and the center drill bit 2 are prevented from being separated; the fixed pin 8 is provided with a limiting hole 9 in the axial direction along the latch hole 7 on the two sides, a limiting pin 10 is arranged in the limiting hole 9, a limiting groove 81 is arranged on the fixed pin 8 corresponding to the limiting pin 10, the limiting pin 10 prevents the fixed pin 8 from sliding out of the latch hole 7 through cooperation of the limiting groove 81, and the double locking effect is realized; the three rotors 3 are uniformly distributed in the circumferential direction of the center drill bit 2, each rotor 3 is provided with an arc-shaped sliding groove 31 matched with the arc-shaped limiting block 5 of the stabilizer 1, the rotor 3 can be stretched out or folded through movement of the arc-shaped limiting block 5 in the arc-shaped sliding groove 31, a pipe shoe 4 is sleeved at the joint of the center drill bit 2 and the stabilizer 1, plays a protection role and is helpful to the guidance of the drilling tool. When the stabilizer 1 rotates, the arc-shaped limiting block 5 moves along the arc-shaped sliding groove 31 on the rotor 3, so that the rotor 3 is stretched out or folded from the opening 21 of the center drill bit 2, when the rotor 3 is stretched out, the diameter of the drilling tool is increased, so that the hole diameter is enlarged in the drilling process and the casing is smoothly followed up; when the rotor 3 is folded, the diameter of the drilling tool is reduced, and the drilling tool is conveniently taken out or further drilled.

[0047] In use, first, the drilling tool is assembled: one end of the stabilizer 1 is clamped into the center drill bit 2 through the clamping structure 6, and the clamping ring 61, the clamping groove 62 and the positioning groove 63 are aligned, one end of the rotor 3 arc-shaped sliding groove 31 is inserted into the center drill bit 2 through the opening 21 of the center drill bit 2, the rotor 3 is installed on the stabilizer 1 through the cooperation of the arc-shaped limiting block 5 and the arc-shaped sliding groove 31, and the outer side of the rotor 3 is located at the opening 21 position on the center drill bit 2, then the fixing pin 8 is clamped into the clamping groove 62 through the insertion pin hole 7, and the limiting pin 10 is used to cooperate with the limiting groove 81 on the fixing pin 8, so that the connection of the stabilizer 1 and the center drill bit 2 is stable; finally, the pipe shoe 4 is sleeved at the joint of the center drill bit 2 and the stabilizer 1, so as to provide guidance and support for the drilling tool, and the assembly of the drilling tool is completed; then, the assembled drilling tool is installed on the drilling machine, drilling operation is started, the drilling machine is started, and the drilling tool starts to rotate, the stabilizer 1 rotates, the rotor 3 is driven to extend from the opening 21 of the center drill bit 2, as the drilling tool advances downward, the rotor 3 expands to enlarge the aperture, and the casing follows to ensure that the hole is not blocked by the cuttings; after drilling is completed, the stabilizer 1 is reversely rotated to make the rotor 3 fold, then the drilling tool is pulled out of the casing, and the drilling operation is completed.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present application, and is only used to illustrate the technical scheme of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application are included in the protection scope of the present application.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A concentric trailing pipe drilling tool, comprising: A stabilizer (1), a center drill bit (2), a rotor (3) and a pipe shoe (4); one end of the stabilizer (1) is rotatably clamped in the center drill bit (2) through a clamping structure (6), and the pipe shoe (4) is sleeved at the joint of the center drill bit (2) and the stabilizer (1), characterized in that: An arc-shaped limiting block (5) is arranged on the lower end face of the stabilizer (1) and diverges from the shaft center to the circumferential face corresponding to the opening (21), an arc-shaped sliding groove (31) is arranged on the rotor (3) corresponding to the arc-shaped limiting block (5), the rotor (3) is clamped on the stabilizer (1) through the cooperation of the arc-shaped limiting block (5) and the arc-shaped sliding groove (31), and the arc-shaped limiting block (5) is moved in the arc-shaped sliding groove (31) through the rotation of the stabilizer (1), and the center drill bit (2) is provided with an opening (21) for the rotor (3) to pass through along the circumferential direction corresponding to the rotor (3), and the rotor (3) can be driven by the rotation of the stabilizer (1) to extend out of or be retracted into the opening (21) of the center drill bit (2).

2. A concentrically trailing pipe drill tool as defined in claim 1, wherein: The opening (21) is three, and is uniformly distributed in the circumferential direction of the center drill bit (2), the end of the stabilizer (1) is provided with three arc-shaped limiting blocks corresponding to the uniform distribution, and the rotor (3) is arranged in the three openings (21) and is connected with the corresponding arc-shaped limiting blocks (5) respectively.

3. A concentrically trailing pipe drill tool as defined in claim 1, wherein: The clamping structure (6) comprises a clamping ring (61) and a clamping groove (62), the clamping groove (62) is arranged on the outer wall of the stabilizer (1) along the circumferential direction of the stabilizer (1), the inner wall of the center drill bit (2) is provided with a positioning groove (63) corresponding to the clamping groove (62), the clamping ring (61) is clamped in the clamping groove (62), and the rotatable connection of the stabilizer (1) and the center drill bit (2) can be realized through the cooperation of the positioning groove (63) and the clamping groove (62).

4. A concentrically trailing pipe drill tool as defined in claim 3, wherein: The upper end outer wall of the center drill bit (2) is provided with a latch hole (7) corresponding to the positioning groove (63), the latch hole (7) is provided with a fixed pin (8) in interference fit, and the fixed pin (8) is clamped in the clamping groove (62) through the latch hole (7).

5. A concentrically trailing pipe drill tool as defined in claim 4, wherein: The clamping ring (61) is composed of at least two circular arc segments, and the fixed pin (8) is clamped in the gap between adjacent circular arc segments.

6. A concentrically trailing pipe drill tool as defined in claim 4, wherein: Limiting holes (9) are arranged on both sides of the fixed pin (8) along the axis of the latch hole (7), the axes of the limiting holes (9) are perpendicular to the axis of the stabilizer (1), the middle part of the limiting hole (9) intersects with the latch hole (7), a limiting pin (10) is arranged in the limiting hole (9), a limiting groove (81) is arranged on the fixed pin (8) corresponding to the limiting pin (10), and the limiting pin (10) can prevent the fixed pin (8) from sliding out of the latch hole (7) through the cooperation with the limiting groove (81).

7. A concentrically trailing pipe drill tool as defined in claim 1, wherein: The rotor (3) is made of high-strength material.

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