Resonance elimination stabilizer

Abstract

The resonance elimination stabilizer comprises an upper connector, the upper connector is a transmission shaft with crowned teeth on the lower portion, a spherical connector is formed at the bottom end of the transmission shaft, and a middle rubber sleeve is further arranged at the position of the spherical connector; an upper rubber sleeve is arranged in the middle of the outer wall of the upper connector, a connector is arranged on one side of the upper rubber sleeve, and a gap is formed between the upper rubber sleeve and the connector. The connector is in threaded connection with the stabilizing sleeve, the lower portion of the connector makes contact with the anti-falling clamping ring, and the upper connector is sleeved with the anti-falling clamping ring. Crowned teeth are arranged in the stabilizing sleeve, the crowned teeth are matched with the crowned teeth of the upper joint, one end, far away from the upper joint, of the stabilizing sleeve is in threaded connection with the lower joint, a ball seat is arranged in the lower joint, and the spherical joint at the bottom end of the upper joint is arranged in the ball seat; a core pipe penetrates through the upper connector and the ball seat, and the lower end of the core pipe abuts against the lower body. Various vibrations between the drill bit and the drilling tool can be overcome and reduced, self-centering of the drill bit in the dynamic state is kept, and various vibrations generated by the drill bit are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well drilling and completion, and particularly relates to a resonance elimination stabilizer. Background Art

[0002] During the drilling process, due to the rock-breaking characteristics of the drill bit, longitudinal, torsional and lateral impact vibrations are generated in the downhole drill string, especially more intense when drilling hard formations or hard-soft interbeds. The vibrations of the drill bit and drill pipe bring great harm to the drilling operation, mainly manifested in: 1. Unable to apply the drilling pressure and torque evenly, resulting in early damage to the drill bit, affecting the drill bit life and drilling speed; 2. Accelerating the fatigue damage of the drill string, especially serious at the connection parts of the drill string components, often occurring stabbing, sticking and fracture accidents; 3. Damaging the surface equipment. 4. The wellbore is irregular. At present, there is no good method for eliminating the vibrations of the drill bit and drill pipe. The use effects of some shock absorbers are not ideal. Therefore, it is necessary to study an effective speed-up shock absorption stabilizer to reduce the vibrations of the drill bit and drill pipe and further solve the problems brought by the vibrations of the drill bit and drill pipe during the drilling process. Summary of the Invention

[0003] In order to solve the problem of vibrations of the drill bit and drill pipe, the present invention provides a resonance elimination stabilizer. By reducing the vibrations of the drill bit and drill pipe, the present invention can improve the life of the drill bit and drill pipe, increase the drilling speed, and moreover, by reducing the vibrations of the drill bit and drill pipe, the drill pipe can also rotate smoothly and keep the wellbore regular.

[0004] The present invention is achieved by adopting the following technical solutions.

[0005] A resonance elimination stabilizer includes an upper sub. The upper sub is a transmission shaft with drum-shaped teeth at the lower part. The bottom end of the transmission shaft forms a spherical joint, and a middle rubber sleeve is also provided at the spherical joint. An upper rubber sleeve is provided in the middle of the outer wall of the upper sub. A joint is provided on one side of the upper rubber sleeve, and a gap is formed between the upper rubber sleeve and the joint. The joint is threadedly connected to a stabilizer sleeve, and the lower part of the joint contacts an anti-drop snap ring, and the anti-drop snap ring is sleeved on the upper sub. The stabilizer sleeve internally has drum-shaped teeth, and the drum-shaped teeth match the drum-shaped teeth of the upper sub. One end of the stabilizer sleeve away from the upper sub is threadedly connected to a lower sub. A ball seat is provided in the lower sub, and the spherical joint at the bottom end of the upper sub sits in the ball seat. A core tube passes through the upper sub and the ball seat, and the lower end of the core tube abuts against the lower body.

[0006] By adopting the above technical solution, when the bottom drill bit contacts the rock and generates vibrations, the vibrations are transmitted upward to the lower body and the middle body. The drum-shaped tooth shaft at the lower part of the upper sub is a spherical involute drum-shaped tooth, and the drum-shaped tooth shaft can swing freely; the connection part between the anti-drop snap ring and the upper sub is arc-shaped, and the anti-drop snap ring is concentric with the spherical joint and the spherical drum-shaped tooth. Therefore, the upper sub can rotate freely relative to the ball seat. Through the rotation of the upper sub, the joint connected to the middle body touches the upper rubber sleeve back and forth, thereby consuming the vibrations on the upper rubber sleeve. Since the spherical joint at the lower part of the upper sub sits in the ball seat of the lower body and can rotate freely, when the vibrations are transmitted, the spherical joint at the lower part of the upper sub can rotate in the ball seat. Therefore, when the lower body tilts or vibrates irregularly, the lower body and the middle body will rotate slightly along the spherical joint at the bottom of the upper sub, and the rotation will cause the bending of the core tube. The core tube will generate a resilience force to make the resonance elimination stabilizer return to the original state.

[0007] Further, the anti-drop snap ring is clamped at the annular protrusion formed on the outer wall of the upper sub, and the contact part between the anti-drop snap ring and the upper sub is arc-shaped.

[0008] Further, an O-ring seal three is provided between the stabilizing sleeve and the lower sub.

[0009] 4. A resonance elimination stabilizer according to claim 1, wherein: O-ring seals five and four are respectively provided on the inner and outer walls at the lower end of the ball seat.

[0010] Further, a lower rubber sleeve is provided between the ball seat and the lower sub.

[0011] Further, a compression cap is provided at the upper end of the core tube, and a sealing sleeve is sleeved on the core tube at the lower end of the compression cap.

[0012] Furthermore, O-ring seals two and one are respectively provided on the inner and outer walls of the sealing sleeve.

[0013] This application has the following beneficial effects.

[0014] The present invention can overcome and reduce various vibrations between the drill bit and the drill string, maintain the self-centering of the drill bit in dynamic state, reduce various vibrations generated by the drill bit, and keep the bite between the drill bit and the formation even when the drill string is tilted; the present invention reduces the dynamic influence of the drill bit on the BHA (bottom hole assembly) through flexible connection, reduces the resonance of the drill bit on the upper screw or BHA, the shock absorption and impact structure reduces the eccentricity of the drill bit, improves the service life of the drill bit, and improves the ROP (drilling rate); reduces the sticking of the drill string, improves the quality of the wellbore, improves the wellbore trajectory, extends the service life of the drill string, and reduces the accident risk of the top drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic structural diagram of the present invention;

[0016] Figure 2 It is an original state diagram of the resonance elimination stabilizer of the present invention;

[0017] Figure 3 It is a movement position state diagram of the resonance elimination stabilizer of the present invention;

[0018] Figure 4 It is a schematic structural diagram of the upper joint of the present invention;

[0019] Figure 5 It is Figure 4 A sectional view along line V-V in

[0020] Figure 6 It is a schematic structural diagram of the stabilizing sleeve of the present invention;

[0021] Figure 7 It is Figure 6 A sectional view along line B-B in

[0022] Among them, 1. Upper joint; 2. Compression cap; 3. O-ring seal one; 4. O-ring seal two; 5. Sealing sleeve; 6. Core tube; 7. Upper rubber sleeve; 8. Joint; 9. Stabilizing sleeve; 10. Anti-falling snap ring; 11. Middle rubber sleeve; 12. Ball seat; 13. O-ring seal three; 14. Lower rubber sleeve; 15. O-ring seal four; 16. O-ring seal five; 17. Lower joint; 18. Oil plug. Specific embodiments

[0023] The present invention will be further described below in conjunction with the drawings and embodiments.

[0024] As Figures 1-7 shown, a resonance elimination stabilizer includes three parts: an upper body, an intermediate body, and a lower body. The upper body includes an upper joint 1, a compression cap 2, a sealing sleeve 5, a core tube 6, an upper rubber sleeve 7, an anti-falling snap ring 10, and a middle rubber sleeve 11. The intermediate body includes a joint 8 and a stabilizing sleeve 9 with drum-shaped teeth inside. The lower body includes a ball seat 12, a lower rubber sleeve 14, and a lower joint 17.

[0025] In the resonance elimination stabilizer of the present application, the upper body and the intermediate body are connected by an anti-falling snap ring 10, and the intermediate body and the lower body are connected by a thread. When the lower body tilts or vibrates irregularly, the lower body and the intermediate body will rotate slightly along the spherical joint at the bottom of the upper joint 1, transmitting the vibration to the upper rubber sleeve 7 and the middle rubber sleeve 11, playing a role of buffering and shock absorption.

[0026] Specifically, the lower part of the upper sub 1 is a transmission shaft with drum-shaped teeth, and the bottom end of the transmission shaft forms a spherical joint. Correspondingly, the inner part of the stabilizer sleeve 9 is also provided with drum-shaped teeth. The drum-shaped teeth used for the cooperation between the upper sub 1 and the stabilizer sleeve 9 can transmit the torque required for the rotation of the drill string during drilling, and the drum-shaped teeth cooperation allows the axes of the transmission shaft and the stabilizer sleeve to swing. A core tube 6 is inserted into the upper sub 1. The core tube 6 is located inside the entire resonance elimination stabilizer. The core tube 6 penetrates through the ball seat 12 and its lower part abuts against the lower body 17. The upper part of the core tube 6 is pressed tightly by a compression cap 2, and a sealing sleeve 5 is sleeved on the core tube 6 at the lower end of the compression cap 2. O-ring seals II 4 and O-ring seals I 3 are respectively arranged on the inner and outer walls of the sealing sleeve 5, which are respectively used for sealing between the sealing sleeve 5 and the core tube 6 and between the sealing sleeve 5 and the upper sub 1.

[0027] An upper rubber sleeve 7 is arranged at the junction of the middle part of the outer wall of the upper sub 1 and the stabilizer sleeve 9. A joint 8 is arranged on one side of the upper rubber sleeve 7, and there is a certain gap between the upper rubber sleeve 7 and the joint 8. The joint 8 is threadedly connected with the stabilizer sleeve 9, and the lower part of the joint 8 contacts the anti-drop snap ring 10. The anti-drop snap ring 10 is composed of two semi-circular snap rings. The anti-drop snap ring 10 is clamped at the annular protrusion formed on the outer wall of the upper sub 1, which is used to limit the movement of the joint 8, and the contact part between the anti-drop snap ring 10 and the upper sub 1 is of an arc design. A middle rubber sleeve 11 is also arranged at the spherical joint at the bottom of the upper sub 1.

[0028] The lower sub 17 is threadedly connected with the stabilizer sleeve 9, and an O-ring seal III 13 is arranged between the lower sub 17 and the stabilizer sleeve 9. A ball seat 12 is arranged inside the lower sub 17. O-ring seals V 16 and O-ring seals IV 15 are respectively arranged on the inner and outer walls at the lower end of the ball seat 12, which are respectively used for sealing between the core tube 6 and the ball seat 12 and between the ball seat 12 and the lower sub 17. In addition, a lower rubber sleeve 14 is arranged between the lower sub 17 and the ball seat 12 in this application. The spherical joint at the bottom of the upper sub 1 of this application sits in the ball seat 12 of the lower body 17, and the two can rotate freely.

[0029] An oil plug 18 is also arranged on the stabilizer sleeve 9 in this invention. Specifically, a sealed threaded hole is machined on the side of the stabilizer sleeve 9, and hydraulic oil can be injected through this hole, so that the spherical joint at the bottom end of the upper sub 1 is in a lubricated state when it contacts the ball seat 12, reducing the contact wear between the two and increasing the tool life; it can also lubricate the drum-shaped teeth cooperation between the upper sub 1 and the stabilizer sleeve 9 and the contact between the anti-drop snap ring 10 and the upper sub 1, reducing the contact wear and increasing the tool life.

[0030] The working principle of this invention is as follows: Since the lower body and the middle body are threadedly connected, the lower body and the middle body are always in a coaxial state. When the resonance elimination stabilizer is in the original state ( Figure 2When shown as such, the upper body and the middle body are also in a coaxial state, and the entire tool axis is on a straight line. Due to the concentric design of the spherical drum teeth at the lower part of the upper body, the spherical joint at the lowermost end of the upper body, and the anti-drop snap ring 10, the resonance elimination stabilizer can make a slight rotation in any direction. When the lower drill bit contacts the formation and transmits the contact force upward, the resonance elimination stabilizer will make a slight rotation in the direction opposite to the drill bit force Figure 3 as shown, and transmit the force to the upper rubber sleeve 7 and the middle rubber sleeve 11. At this time, the core tube 6 inside the resonance elimination stabilizer is stressed and bent. Since the core tube 6 is made of an elastic material, the core tube 6 will generate a resilience force on the middle body and the lower body in the direction opposite to the bending direction, so as to quickly return the resonance elimination stabilizer to its original state and maintain the dynamic self-centering of the drill bit. Since the drill bit constantly contacts and is stressed by the formation underground, it will constantly make slight rotations, and the above-mentioned movement process will constantly repeat.

[0031] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A resonance elimination stabilizer, characterized in that: The invention comprises an upper joint (1), wherein the upper joint (1) is a transmission shaft with drum-shaped teeth at the bottom, and a spherical joint is formed at the bottom end of the transmission shaft, and a middle rubber sleeve (11) is also provided at the spherical joint; an upper rubber sleeve (7) is provided at the middle of the outer wall of the upper joint (1), and a joint (8) is provided at one side of the upper rubber sleeve (7), and a gap is formed between the upper rubber sleeve (7) and the joint (8); the joint (8) is threadedly connected to a stabilizing sleeve (9), and the lower part of the joint (8) is in contact with an anti-drop clamping ring (10), and the anti-drop clamping ring (10) is in contact with the stabilizing sleeve (9). ) is sleeved on the upper joint (1); the stabilizing sleeve (9) is provided with drum-shaped teeth inside, and the drum-shaped teeth match the drum-shaped teeth of the upper joint (1); the end of the stabilizing sleeve (9) away from the upper joint (1) is threadedly connected to the lower joint (17); a ball seat (12) is provided in the lower joint (17), and the ball joint at the bottom end of the upper joint (1) is seated in the ball seat (12); a core tube (6) is passed through the upper joint (1) and the ball seat (12), and the lower end of the core tube (6) is against the lower body (17).

2. A resonance elimination stabilizer according to claim 1, characterized in that: The anti-drop clamp ring (10) is clamped on the annular protrusion formed on the outer wall of the upper joint (1), and the contact portion between the anti-drop clamp ring (10) and the upper joint (1) is arc-shaped.

3. A resonance elimination stabilizer according to claim 1, characterized in that: An O-type sealing ring (13) is provided between the stabilizing sleeve (9) and the lower joint (17).

4. A resonance elimination stabilizer according to claim 1, characterized in that: The inner and outer walls of the lower end of the ball seat (12) are respectively provided with an O-type sealing ring five (16) and an O-type sealing ring four (15).

5. A resonance elimination stabilizer according to claim 1, characterized in that: A lower rubber sleeve (14) is provided between the ball seat (12) and the lower joint (17).

6. A resonance elimination stabilizer according to claim 1, characterized in that: A pressure cap (2) is provided at the upper end of the core tube (6), and a sealing sleeve (5) is sleeved on the core tube (6) at the lower end of the pressure cap (2).

7. A resonance elimination stabilizer according to claim 6, characterized in that: An O-type sealing ring 2 (4) and an O-type sealing ring 1 (3) are respectively arranged on the inner and outer walls of the sealing sleeve (5).

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