A drill bit straightening and retrieval device

Abstract

This utility model relates to the field of salvage device technology, and more specifically, to a drill bit straightening and salvage device. It includes a connecting body, a straightening mechanism, and a grabbing mechanism. The connecting body is configured from top to bottom as an upper layer, a middle layer, and a lower layer. The top of the upper layer has a first threaded hole, and second threaded holes are opened on both sides of the first threaded hole. The straightening mechanism is located in the middle layer, which is a solid structure and not connected to the upper or lower layers. The grabbing mechanism is located in the lower layer. The upper layer is solid and primarily reinforces the load-bearing core. The upper layer is designed as a "solid metal segment with only functional holes," retaining most of the metal volume at the top of the connecting body. The metal wall thickness around the internal threaded holes effectively disperses concentrated stress during lifting, preventing deformation or breakage of the threaded holes due to excessive hollowness, thus solving the problems existing in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of salvage device technology, and more specifically, to a drill bit straightening and salvage device. Background Technology

[0002] In the construction processes of mineral resource exploration, coalbed methane exploration and development, water resource exploration and development, hydrogeological exploration, and geothermal well development, accidents such as drill string burial, stuck drill string, and dropped drill string frequently occur due to complex construction techniques and geological formations, large borehole diameters, and operational errors. Furthermore, the top of the drill string in these accidents is often not in the center of the borehole, but rather against the inner side of the borehole wall. To ensure drilling quality and reduce economic losses caused by accidents, it is necessary to promptly retrieve the damaged drill string from the borehole, thus requiring the design of a drill string straightening and retrieval device. However, existing technologies still have some limitations, such as the inability to guarantee load-bearing capacity. Utility Model Content

[0003] This invention aims to overcome the problem of insufficient load-bearing strength by providing a technical solution that addresses the aforementioned issues.

[0004] A drill bit straightening and retrieval device includes a connecting body, a straightening mechanism, and a capture mechanism. The connecting body is configured as an upper layer, a middle layer, and a lower layer from top to bottom. The top of the upper layer is provided with a first threaded hole, and second threaded holes are provided on both sides of the first threaded hole. The straightening mechanism is located in the middle layer. The middle layer is a solid structure and is not connected to the upper and lower layers. The capture mechanism is located in the lower layer.

[0005] Furthermore, it includes a mounting base, a straightening arm, a wear-resistant rubber buffer layer, a mechanical pressure regulating valve, and a first spring. The middle layer has a groove with a manual pressure regulating rod inside. The mounting base has a ring structure, and the middle layer sidewall has mounting grooves evenly distributed around its circumference. One end of the straightening arm is connected to the mounting groove via a hinge, and the other end is a free end. The wear-resistant rubber buffer layer is wrapped around the outer surface of the straightening arm through a vulcanization process. The mechanical pressure regulating valve is fixed inside the mounting base and connected to the built-in air chamber of the straightening arm via an air pipe. The top of the mechanical pressure regulating valve is connected to the connecting rod. The first spring is sleeved on the outside of the connecting rod, with its two ends abutting against the connecting body and the mechanical pressure regulating valve, respectively.

[0006] Furthermore, it includes an arc-shaped locking clip and a spring push rod. The lower inner wall has a first groove evenly opened around its circumference. The arc-shaped locking clip is slidably set in the first groove. A pre-compressed spring push rod is installed between the outer side of the arc-shaped locking clip and the bottom of the first groove. The inner side of the arc-shaped locking clip is fixed by adhesive bonding. It is a composite structure of serrations and elastic pads.

[0007] Furthermore, it also includes a mechanical locking mechanism and a pressure feedback plate. The mechanical locking mechanism includes a locking pin and a locking spring. A radial locking hole is opened on the lower side wall. The locking pin is slidably set in the locking hole. The locking spring is sleeved on the outside of the locking pin, so that one end of the locking pin extends into the groove. A locking groove matching the locking pin is opened on the outside of the arc-shaped slip. The pressure feedback plate is fixed on the inside of the arc-shaped slip.

[0008] Furthermore, the mechanical pressure regulating valve has air outlets evenly distributed circumferentially in the lower middle part of its side wall, and the air outlets adopt an external thread and conical sealing surface structure.

[0009] Furthermore, circumferentially evenly distributed tracheal interface holes are opened on the outer wall of the mounting groove, and the tracheal interface holes are aligned with the air chamber interface holes of the straightening arm.

[0010] Furthermore, the straightening arm includes a fixed section and a working section. The fixed section has a hinge shaft hole and an air chamber interface hole. The working section has an arc-shaped gradual change structure and an axial air chamber inside. The air chamber is connected to the air outlet of the mechanical pressure regulating valve through an air pipe.

[0011] Furthermore, carbide serrations are arranged on the inner side of the arc-shaped chuck.

[0012] Furthermore, a connecting rod is provided on the manual pressure regulating rod, which extends out of the top surface of the connecting body. When pulled up, the connecting rod compresses the first spring, pushing the mechanical pressure regulating valve down to increase the pressure. When released, the first spring returns to its original position, causing the mechanical pressure regulating valve to move up to decrease the pressure.

[0013] Furthermore, both the righting mechanism and the arresting mechanism are welded using a full circumferential welding process.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Compared to existing technologies, the drill string straightening and retrieval device of this utility model requires the connecting body to simultaneously bear the axial tensile force and radial pressure of lifting the drill string. The axial layered design, through "differentiated structural distribution," fundamentally resolves the contradiction between "functional openings" and "structural strength." The upper layer is solid and dominant, reinforcing the core load-bearing structure. The upper layer is designed as a solid metal section with internally threaded holes, retaining over 90% of the metal volume at the top of the connecting body. The metal wall thickness around the internally threaded holes effectively disperses concentrated stress during lifting, preventing deformation or breakage of the threaded holes due to excessive hollowness. Simultaneously, the absence of additional slots or cavities ensures that the lifting force can be stably transmitted to the lower section and the module below through the solid metal structure. The load-bearing reliability is improved by more than 60% compared to the "fully hollow" design. The mid-layer localized slotting balances guidance and strength, providing precise axial sliding guidance for the manual pressure adjusting rod while avoiding the weakening of the sidewall strength caused by full-section slotting. The remaining metal wall thickness can withstand radial pressure and forms a continuous load-bearing skeleton with the upper solid structure, ensuring that the mid-section will not deform due to wellbore compression when the device is lowered into the well. The lower layer is partially hollow, balancing functionality and rigidity. Through a "non-penetrating + annular stepped surface" structure, this design ensures that the hollow area occupies only 30% of the lower section's volume, allowing the remaining solid metal to continue transmitting lifting tension and radial pressure, while preventing mud from seeping into the hollow area through the top internal threaded hole. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a cross-sectional view of the drill bit straightening and retrieval device of this utility model.

[0018] Figure 2 This is a partial structural diagram of the capture mechanism in this utility model.

[0019] Figure 3 This is a schematic diagram of the overall structure of the drill bit straightening and retrieval device in this utility model.

[0020] In the diagram: 1. Connecting body; 2. Upper layer; 3. Middle layer; 4. Lower layer; 5. Slide groove; 6. First threaded hole; 7. Second threaded hole; 8. Straightening mechanism; 801. Manual pressure adjusting rod; 802. Connecting rod; 803. Mechanical pressure regulating valve; 804. Connecting rod; 805. Spring; 806. Mounting groove; 807. Straightening arm; 9. Grabbing mechanism; 901. Arc-shaped slip; 10. Second groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1 As shown, the drill bit straightening and retrieval device in this embodiment includes a connecting body 1, a straightening mechanism 8, and a grabbing mechanism 9. The connecting body 1 is configured from top to bottom as an upper layer 2, a middle layer 3, and a lower layer 4. The top of the upper layer 2 is provided with a first threaded hole 6, and the two sides of the first threaded hole 6 are provided with second threaded holes 7. The straightening mechanism 8 is located in the middle layer 3. The middle layer 3 is a solid structure and is not connected to the upper layer 2 and the lower layer 4. The grabbing mechanism 9 is located in the lower layer 4.

[0023] In this utility model, such as Figure 1-3 As shown, the device includes a mounting base, a straightening arm 807, a wear-resistant rubber buffer layer, a mechanical pressure regulating valve 803, and a first spring 805. The middle layer 3 has a groove 5, within which a manual pressure regulating rod 801 is installed. The mounting base is annular, and mounting grooves 806 are evenly distributed around the sidewalls of the middle layer 3. One end of the straightening arm 807 is connected to the mounting groove 806 via a hinge, while the other end is free. The wear-resistant rubber buffer layer is wrapped around the outer surface of the straightening arm 807 using a vulcanization process. The mechanical pressure regulating valve 803... 3. Fixed inside the mounting base, connected to the built-in air chamber of the straightening arm 807 through an air pipe, the top of the mechanical pressure regulating valve 803 is connected to the connecting rod 804, the first spring 805 is sleeved on the outside of the connecting rod 804, and the two ends respectively abut against the connecting body 1 and the mechanical pressure regulating valve 803. The straightening arm 807 includes a fixed section and a working section. The fixed section has a hinge shaft hole and an air chamber interface hole. The working section has an arc-shaped gradual structure and an axial air chamber inside. The air chamber is connected to the air outlet of the mechanical pressure regulating valve 803 through an air pipe.

[0024] The lower layer 4 has a first groove 10 evenly distributed around its inner wall. An arc-shaped slip 901 is slidably disposed in the first groove 10. A pre-compressed spring push rod is installed between the outer side of the arc-shaped slip 901 and the bottom of the first groove 10. The inner side of the arc-shaped slip 901 is fixed by adhesive bonding. The mechanical locking mechanism includes a locking pin and a locking spring. The lower layer 4 has a radial locking hole on its side wall. The locking pin is slidably disposed in the locking hole. The locking spring is sleeved on the outer side of the locking pin, so that one end of the locking pin extends into the groove. A locking groove matching the locking pin is opened on the outer side of the arc-shaped slip 901. A pressure feedback plate is fixed on the inner side of the arc-shaped slip 901. Hard alloy serrations are arranged on the inner side of the arc-shaped slip 901.

[0025] In this invention, the outer wall of the mounting groove 806 has circumferentially evenly distributed air pipe interface holes, which are aligned with the air chamber interface holes of the straightening arm 807. The mechanical pressure regulating valve 803 has circumferentially evenly distributed air outlets on its lower side wall, and these outlets employ an external thread and a tapered sealing surface structure.

[0026] In this utility model, a connecting rod 802 is provided on the manual pressure regulating rod 801, which extends out of the top surface of the connecting body 1. When it is pulled up, the first spring 805 is compressed through the connecting rod 804, which pushes the mechanical pressure regulating valve 803 to move down to increase the pressure. When it is released, the first spring 805 returns to its original position, which drives the mechanical pressure regulating valve 803 to move up to reduce the pressure.

[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A drill bit straightening and retrieval device, characterized in that: The device includes a connecting body (1), a straightening mechanism (8), and a capturing mechanism (9). The connecting body (1) is configured from top to bottom as an upper layer (2), a middle layer (3), and a lower layer (4). The top of the upper layer (2) is provided with a first threaded hole (6), and the two sides of the first threaded hole (6) are provided with second threaded holes (7). The straightening mechanism (8) is located in the middle layer (3). The middle layer (3) is a solid structure and is not connected to the upper layer (2) and the lower layer (4). The capturing mechanism (9) is located in the lower layer (4). The device includes a mounting base, a straightening arm (807), a wear-resistant rubber buffer layer, a mechanical pressure regulating valve (803), and a first spring (805). The middle layer (3) has a groove (5) and a manual pressure regulating rod (801) is installed in the groove (5). The mounting base is a ring structure. The middle layer (3) has a mounting groove (806) evenly distributed around its side wall. One end of the straightening arm (807) is connected to the mounting groove (806) by a hinge, and the other end is a free end. The wear-resistant rubber buffer layer is wrapped around the outer surface of the straightening arm by a vulcanization process. The mechanical pressure regulating valve (803) is fixed inside the mounting base and connected to the built-in air chamber of the straightening arm (807) through an air pipe. The top of the mechanical pressure regulating valve (803) is connected to the connecting rod (804). The first spring (805) is sleeved on the outside of the connecting rod (804) and its two ends abut against the connecting body (1) and the mechanical pressure regulating valve (803) respectively. Includes an arc-shaped locking plate (901) and a spring push rod. The inner wall of the lower layer (4) is uniformly provided with a first groove (10) in the circumferential direction. The arc-shaped locking plate (901) is slidably disposed in the first groove (10). A pre-compressed spring push rod is installed between the outer side of the arc-shaped locking plate (901) and the bottom of the first groove (10). The inner side of the arc-shaped locking plate (901) is fixed by adhesive bonding. It is a composite structure of serrations and elastic pads.

2. The drill bit straightening and retrieval device according to claim 1, characterized in that: It also includes a mechanical locking mechanism and a pressure feedback plate. The mechanical locking mechanism includes a locking pin and a locking spring. A radial locking hole is opened on the side wall of the lower layer (4). The locking pin is slidably disposed in the locking hole. The locking spring is sleeved on the outside of the locking pin so that one end of the locking pin extends into the groove. A locking groove matching the locking pin is opened on the outside of the arc-shaped slip (901). The pressure feedback plate is fixed on the inside of the arc-shaped slip (901).

3. The drill bit straightening and retrieval device according to claim 2, characterized in that: The mechanical pressure regulating valve (803) has air outlets evenly distributed circumferentially in the lower middle part of its side wall, and the air outlets adopt an external thread and a conical sealing surface structure.

4. The drill bit straightening and retrieval device according to claim 3, characterized in that: The outer wall of the mounting groove (806) has circumferentially evenly distributed tracheal interface holes, which are aligned with the air cavity interface holes of the straightening arm (807).

5. The drill bit straightening and retrieval device according to claim 4, characterized in that: The straightening arm (807) includes a fixed section and a working section. The fixed section has a hinge shaft hole and an air chamber interface hole. The working section has an arc-shaped gradual change structure and an axial air chamber inside. The air chamber is connected to the air outlet of the mechanical pressure regulating valve (803) through an air pipe.

6. The drill bit straightening and retrieval device according to claim 5, characterized in that: The inner side of the arc-shaped chuck (901) is arranged with carbide serrations.

7. A drill bit straightening and retrieval device according to claim 6, characterized in that: The manual pressure regulating rod (801) is provided with a connecting rod (802) that extends out of the top surface of the connecting body (1). When it is pulled up, the connecting rod (804) compresses the first spring (805), pushing the mechanical pressure regulating valve (803) to move down and increase the pressure. When it is released, the first spring (805) resets and drives the mechanical pressure regulating valve (803) to move up and decrease the pressure.

8. The drill bit straightening and retrieval device according to claim 7, characterized in that: The welding of the straightening mechanism (8) and the capture mechanism (9) both adopts the circumferential full welding process.

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