A petroleum drill tool swivel joint

Abstract

The utility model belongs to the technical field of drill tool joint, especially an oil drilling tool conversion joint, including drill rod, fixed end and drill bit end, the top fixedly connected with drill tool joint of drill rod, the top fixedly connected with fixed end of drill tool joint, the top of fixed end is equipped with the locating ring, the inside fixed mounting of fixed end has the support ball head, the lower end fixedly connected with the butt joint ring of drill bit end, the butt joint ring with the locating ring is connected fixed through at least one locating bolt, the inside of butt joint ring is equipped with the locating pin rod, one end of locating pin rod is equipped with the locating nut, through the cooperation of support ball head and drill bit end inner chamber ball socket, realized automatic centering, effectively compensated the processing and installation error, reduced the eccentric wear and vibration significantly, through the main connection of threaded end and threaded installation groove, the circumferential locking of locating bolt to locating ring and butt joint ring, and the penetration of anti-loose of locating pin rod, formed the three -fold protection mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of drill joint technology, specifically relating to an oil drilling tool conversion joint. Background Technology

[0002] In oil drilling operations, the drill pipe and drill bit need to be connected and power transmitted through adapters.

[0003] Currently, widely used adapters primarily rely on large-diameter precision threads for connection. While this connection method is structurally simple, it has revealed numerous problems in practical use.

[0004] During drilling in deep, ultra-deep, or horizontally extended wells, the drill string is subjected to complex alternating stresses, severe vibrations, and impact loads. After prolonged stress, purely threaded joints are prone to slight plastic deformation or wear, causing the drill bit centerline to deviate from the drill pipe centerline. This moderate deterioration can lead to abnormal vibrations throughout the drill string, exacerbating uneven wear and stress concentration at the joint threads. This not only significantly shortens the service life of the drill bit and joint themselves but also seriously affects drilling quality and wellbore trajectory control. Therefore, we propose an oil drilling tool conversion joint. Utility Model Content

[0005] To address the issues raised in the background section regarding drilling in deep, ultra-deep, or horizontally extended wells, where the drill string is subjected to complex alternating stresses, severe vibrations, and impact loads, and where purely threaded connections are prone to minor plastic deformation or wear after prolonged stress, leading to a misalignment between the drill bit centerline and the drill pipe centerline, this moderate deterioration can cause abnormal vibrations throughout the drill string, exacerbate uneven wear and stress concentration at the threaded joint, significantly shorten the service life of both the drill bit and the joint, and severely impact drilling quality and wellbore trajectory control. This invention provides an oil drilling tool adapter.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an oil drilling tool adapter, comprising a drill rod, a fixed end, and a drill bit end, wherein a drill tool connector is fixedly connected to the top of the drill rod, a fixed end is fixedly connected above the drill tool connector, a positioning ring is provided at the top of the fixed end, and a support ball head is fixedly installed inside the fixed end;

[0007] A drill bit end is detachably mounted on the upper part of the fixed end. A mating ring is fixedly connected to the lower end of the drill bit end. The mating ring and the positioning ring are connected and fixed by at least one positioning bolt. Horizontal through slots are opened at corresponding positions of the support ball head and the drill bit end. A positioning pin passes through the through slot, and a positioning nut is fitted on one end of the positioning pin.

[0008] As a preferred embodiment of the oil drilling tool conversion joint of this utility model, an annular threaded mounting groove is formed between the supporting ball head and the inner wall of the fixed end.

[0009] As a preferred embodiment of the oil drilling tool conversion connector of this utility model, the lower end of the drill bit is also fixedly connected to a threaded end, which is threadedly engaged with the threaded mounting groove.

[0010] In a preferred embodiment of this utility model, the positioning ring is welded to the top of the fixed end.

[0011] As a preferred embodiment of the oil drilling tool conversion joint of this utility model, the mating ring and the drill bit end are an integral structure.

[0012] As a preferred embodiment of the oil drilling tool conversion joint of this utility model, the bottom of the inner cavity of the drill bit end is provided with a groove that matches the spherical shape of the supporting ball head.

[0013] As a preferred embodiment of the oil drilling tool conversion joint of this utility model, the positioning pin is a pin with external threads machined at one end.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By using the cooperation between the support ball head and the inner cavity ball socket of the drill bit end, automatic alignment is achieved, effectively compensating for processing and installation errors, and significantly reducing wear and vibration. Through the main connection between the threaded end and the threaded mounting groove, the circumferential locking of the positioning ring and the mating ring by the positioning bolt, and the through-hole anti-loosening of the positioning pin, a triple protection mechanism is formed. This multi-locking structure greatly improves the reliability and safety of the joint under high pressure, high torque and strong vibration conditions, fundamentally eliminating loosening accidents and preventing the problem of difficulty in ensuring centering after long-term stress on a purely threaded connection joint. Attached Figure Description

[0015] 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:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the fixed end of this utility model;

[0018] Figure 3 This is a schematic diagram of the connection structure between the fixed end and the drill bit end of this utility model;

[0019] Figure 4 This is a schematic diagram of the drill bit end of this utility model.

[0020] In the diagram: 1. Drill pipe; 2. Drill tool connector; 3. Fixed end; 4. Positioning ring; 5. Support ball head; 6. Threaded mounting groove; 7. Butt ring; 8. Drill bit end; 9. Positioning bolt; 10. Threaded end; 11. Through slot; 12. Positioning pin; 13. Positioning nut. 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] Example 1

[0023] like Figures 1-4 As shown;

[0024] An oil drilling tool adapter includes a drill pipe 1, a fixed end 3, and a drill bit end 8. A drill tool connector 2 is fixedly connected to the top of the drill pipe 1, and the fixed end 3 is fixedly connected above the drill tool connector 2. A positioning ring 4 is provided on the top of the fixed end 3, and a support ball head 5 is fixedly installed inside the fixed end 3. The drill bit end 8 is detachably installed above the fixed end 3, and a mating ring 7 is fixedly connected to the lower end of the drill bit end 8. The mating ring 7 and the positioning ring 4 are connected and fixed by at least one positioning bolt 9. Horizontal through slots 11 are opened at corresponding positions of the support ball head 5 and the drill bit end 8. A positioning pin 12 passes through the through slot 11, and a positioning nut 13 is sleeved on one end of the positioning pin 12.

[0025] In this implementation plan: automatic alignment is achieved by the cooperation between the support ball head 5 and the inner cavity ball socket of the drill bit end 8, which effectively compensates for machining and installation errors and significantly reduces uneven wear and vibration. A triple protection mechanism is formed by the main connection between the threaded end 10 and the threaded mounting groove 6, the circumferential locking of the positioning bolt 9 to the positioning ring 4 and the mating ring 7, and the through-hole anti-loosening of the positioning pin 12. This multi-locking structure greatly improves the reliability and safety of the joint under high pressure, high torque and strong vibration conditions, and fundamentally eliminates loosening accidents.

[0026] In an optional embodiment, an annular threaded mounting groove 6 is formed between the support ball head 5 and the inner wall of the fixed end 3.

[0027] In this implementation scheme: the threaded mounting groove 6 is an annular space formed by the outer wall of the supporting ball head 5 and the inner wall of the fixed end 3. The threaded pair that bears the main torque is set inside the fixed end 3, making the structure more compact and with good overall rigidity. It can effectively withstand the high torque generated during drilling and provide a natural guide and positioning reference for the threaded end 10 at the lower end of the drill bit end 8. In conjunction with the spherical guiding effect of the supporting ball head 5, it ensures the initial alignment when the threads are engaged.

[0028] In an optional embodiment, the lower end of the drill bit end 8 is also fixedly connected to a threaded end 10, which is threadedly engaged with the threaded mounting groove 6.

[0029] In this implementation plan, the main connection and primary locking mechanism of the adapter are formed. The tight fit between the threaded end 10 and the threaded mounting groove 6 is the main channel for transmitting drilling power from the drill pipe 1 to the drill bit end 8, which can reliably transmit huge drilling torque. By tightening the threads, a strong axial tensile force can be generated on the drill bit end 8, so that the mating ring 7 at its lower part is pressed against the positioning ring 4 at the top of the fixed end 3, providing a stable foundation for subsequent bolt locking.

[0030] In an optional embodiment, the positioning ring 4 is welded to the top of the fixed end 3.

[0031] In this implementation scheme, welding ensures that the positioning ring 4 and the fixed end 3 are integrated, avoiding loosening or relative rotation that may occur under vibration, and ensuring the reliability of the circumferential locking reference surface.

[0032] In an optional embodiment, the mating ring 7 and the drill bit end 8 are an integral structure.

[0033] In this implementation plan, the weak link that may be caused by the use of threads or bolts between the mating ring 7 and the drill bit end 8 is eliminated, stress concentration is avoided, and the component can withstand greater bending and torsional loads.

[0034] In an optional embodiment, the bottom of the inner cavity of the drill bit end 8 is provided with a groove that matches the spherical shape of the supporting ball head 5.

[0035] In this implementation scheme, the fit between the spherical surface and the socket is adaptive. In the initial stage of installation, when the groove of the drill bit end 8 is fitted onto the supporting ball head 5, even if there are slight manufacturing or installation deviations, the spherical contact can guide the drill bit end 8 to automatically adjust to the center position, which greatly improves the straightness of the drill string.

[0036] In an optional embodiment, the locating pin 12 is a pin with external threads machined at one end.

[0037] In this implementation scheme: the threaded end allows for easy locking with just one locating nut 13, simplifying operation. The locating pin 12 runs horizontally through the entire connection core, forming a final mechanical anti-loosening safety measure. Even in the event of extreme accidental loosening of the threaded and bolted connections at the front end, this pin effectively prevents the drill bit end 8 from falling off, ensuring extremely high safety.

[0038] Working principle:

[0039] During installation, first, the inner cavity at the lower end of the drill bit 8, that is, the ball-and-socket shape that matches the support ball head 5, is fitted onto the support ball head 5 inside the fixed end 3. The drill bit 8 can automatically align itself, so that its axis is initially aligned with the axis of the fixed end 3, reducing installation errors from the source. Then, rotate the drill bit 8 so that its lower threaded end 10 is screwed into the annular threaded mounting groove 6 formed between the inner wall of the fixed end 3 and the support ball head 5, until it is tightened. This tightening direction is consistent with the working rotation direction of the drill bit.

[0040] Once the threaded connection is in place, the mating ring 7 at the lower part of the drill bit end 8 will fit tightly with the positioning ring 4 welded to the top of the fixed end 3. Multiple positioning bolts 9 are passed through the corresponding bolt holes on the mating ring 7 and the positioning ring 4, and locked with nuts at the lower end, achieving rigid locking of the drill bit end 8 and the fixed end 3 in the circumferential direction, effectively preventing relative rotation of the threaded pair that may occur under high torque and vibration conditions.

[0041] At this time, the slots 11 at the corresponding positions of the top of the support ball head 5 and the top of the drill bit end 8 will align with each other. Insert the positioning pin 12 horizontally into the aligned slots 11, and then screw the positioning nut 13 onto the protruding end of the positioning pin 12 and tighten it. The positioning pin 12, as the last line of defense, penetrates the core components of the connection. Even if the first two levels of connection become extremely loose, it can prevent the drill bit end 8 from separating from the main body, thus playing the ultimate safety role.

[0042] During disassembly, operate in reverse order: first remove the positioning nut 13 and positioning pin 12, then unscrew the positioning bolt 9, and finally reverse the drill bit end 8 to remove it.

[0043] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are 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. An oil drilling tool adapter, comprising a drill pipe (1), a fixed end (3), and a drill bit end (8), characterized in that: The drill pipe (1) is fixedly connected to the top of the drill joint (2), and a fixed end (3) is fixedly connected above the drill joint (2). The fixed end (3) is provided with a positioning ring (4) at the top, and a support ball head (5) is fixedly installed inside the fixed end (3). A drill bit end (8) is detachably installed above the fixed end (3). A mating ring (7) is fixedly connected to the lower end of the drill bit end (8). The mating ring (7) is connected and fixed to the positioning ring (4) by at least one positioning bolt (9). A horizontal through slot (11) is opened at the corresponding position of the support ball head (5) and the drill bit end (8). A positioning pin (12) passes through the through slot (11). A positioning nut (13) is sleeved on one end of the positioning pin (12).

2. The oil drilling tool adapter according to claim 1, characterized in that: An annular threaded mounting groove (6) is formed between the supporting ball head (5) and the inner wall of the fixed end (3).

3. The oil drilling tool adapter according to claim 2, characterized in that: The lower end of the drill bit end (8) is also fixedly connected to a threaded end (10), which is threadedly engaged with the threaded mounting groove (6).

4. The oil drilling tool adapter according to claim 1, characterized in that: The positioning ring (4) is welded to the top of the fixed end (3).

5. The oil drilling tool adapter according to claim 1, characterized in that: The docking ring (7) and the drill bit end (8) are an integral structure.

6. The oil drilling tool adapter according to claim 1, characterized in that: The bottom of the inner cavity of the drill bit end (8) is provided with a groove that matches the spherical shape of the supporting ball head (5).

7. The oil drilling tool adapter according to claim 1, characterized in that: The positioning pin (12) is a pin with external threads machined at one end.

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