Axial and circumferential composite vibration drag reduction drilling tool

Abstract

The present invention discloses an axial-circumferential composite vibration drag reduction drill tool, which includes an outer tube, an upper joint being threadedly connected at the upper end of the outer tube, an oscillator being provided inside the outer tube, and the oscillator including a cover plate and a base plate. Compared with the prior art, the present invention has the following advantages: the present invention has a simple and compact structure, adopts a single feedback channel, has good jet switching stability, is not prone to flow channel blockage, and can generate periodic liquid flow pressure by relying solely on the internal fluid channel setting, pushing the impact block to swing and hitting the left and right walls of the oscillation chamber to generate circumferential vibration. At the same time, the impact force of the fluid flowing through the feedback channel forms axial vibration, causing the drill tool to creep axially, converting static friction into sliding friction, thereby reducing drill pipe friction. Compared with the pulse pressure generated by other types of vibration drag reduction devices, the present device has a simple structure, is easy to control frequency and pressure drop, is short in size, and has a high slope rate, which can effectively improve downhole operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field, in particular to an axial and circumferential composite vibration drag reduction drilling tool. Background Art

[0002] With the deepening of underground resource exploration and underground space development, the complexity of drilling wellbore structures continues to increase, placing new demands on drilling engineering technology. During the drilling of horizontal or directional wells, long horizontal sections and areas with large wellbore curvature generate significant friction, reducing the efficiency of drilling pressure transmission. High friction and insufficient drilling pressure not only reduce drilling speed and affect drilling efficiency, but also increase wear on drilling tools, causing complex downhole accidents such as stuck pipe. To address the problems of increasing the length of horizontal sections in horizontal wells and achieving rapid drilling, adding vibration drag reduction tools to downhole drilling tools is currently a common and effective measure. After adding vibration drag reduction tools, the drill string vibrates at a certain frequency and amplitude along its axis, converting static friction between the drill string and the wellbore wall during sliding drill biting into sliding friction, reducing friction between the pipe string and the wellbore wall, thereby reducing energy loss, preventing the generation of back pressure, and improving drilling efficiency.

[0003] Existing pressure pulse generators primarily utilize the shear valve and rotary valve pulse principles. Their operating principle is to create periodic changes in the flow area of ​​the stator and rotor, thereby generating continuous pressure pulses within the drill string. These pulsed pressure waves are then transmitted to the oscillating mechanism, generating axial vibration. These pressure generators are complex in structure, have numerous vulnerable components, and can only generate single axial or circumferential vibrations, limiting their drag reduction effectiveness under complex downhole conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an axial-circumferential composite vibration drag reduction drilling tool in view of the deficiencies raised in the above background technology.

[0005] To solve the above technical problems, the present invention provides a technical solution: an axial-circumferential composite vibration drag reduction drill tool, which includes an outer tube, an upper joint is threadedly connected to the upper end of the outer tube, an oscillator is provided inside the outer tube, and the oscillator includes a cover plate and a base plate;

[0006] The oscillator includes an inlet and an outlet, which are respectively connected to the outer tube to form a fluid channel for fluid to pass through. A guide block is provided in the oscillator, which divides the interior of the oscillator into a jet oscillation chamber, a vortex chamber, and a feedback channel connecting the oscillation chamber and the vortex chamber.

[0007] The oscillator has a left bump block and a right bump block hingedly provided on both sides of the inner jet oscillation cavity. The oscillator has a left wall surface and a right wall surface of the oscillation cavity that match the left bump block and the right bump block on both sides.

[0008] As an improvement, a splitter tip is provided in the middle of the vortex chamber below the left collision block and the right collision block to facilitate the inner collision of the left collision block and the right collision block and to separate the flow directions.

[0009] As an improvement, the vortex chamber connection is provided with a left pin and a right pin respectively cooperating with the swing of the left bumper block and the right bumper block, thereby facilitating the swing operation of the left bumper block and the right bumper block.

[0010] As an improvement, the inlet is in the shape of a cone, a straight cone or a circular arc inlet, so as to give the fluid a certain initial velocity.

[0011] As an improvement, the upper end of the oscillator contacts and seals with the upper joint, and the lower end of the oscillator contacts and seals with the outer tube, thereby ensuring the sealing performance and uniformity of oscillation of the present application.

[0012] As an improvement, the cover plate and the base plate are respectively provided with an inlet groove and an outlet groove which are connected to the inlet and outlet respectively. The upper joint is provided with an upper joint fluid channel which is connected to the inlet groove, and the bottom of the outer tube is provided with a lower joint fluid channel which is connected to the outlet groove, so as to ensure that the fluid flows smoothly in the fluid channel.

[0013] After adopting the above structure, the present invention has the following advantages: the present invention has a simple and compact structure, adopts a single feedback channel, has good jet switching stability, is not prone to flow channel blockage, and only relies on the internal fluid channel setting to generate periodic liquid flow pressure, push the impact block to swing, hit the left and right side walls of the oscillation chamber, and generate circumferential vibration. At the same time, the impact force of the fluid flowing through the feedback channel forms axial vibration, causing the drill tool to creep axially, and static friction is converted into sliding friction, thereby reducing drill pipe friction. Compared with the pulse pressure generated by other types of vibration drag reduction devices, this device has a simple structure, easy to control frequency and pressure drop, short size, high inclination rate, and can effectively improve downhole operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional view of an axial and circumferential composite vibration drag reduction drilling tool;

[0015] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at the AA position;

[0016] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at the middle BB position.

[0017] As shown in the figure: 1. Upper joint fluid channel; 2. Inlet; 3. Feedback channel; 4. Guide block; 5. Oscillation chamber; 6. Vortex chamber; 7. Left wall of oscillation chamber; 8. Right wall of oscillation chamber; 9. Outlet; 10. Left bumper block; 11. Right bumper block; 12. Lower joint fluid channel; 13. Wedge tip; 14. Left pin; 15. Right pin; 16. Inlet slot; 17. Outlet slot; 18. Outer tube; 19. Upper joint; 20. Oscillator; 21. Cover plate; 22. Base plate. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to the accompanying drawings.

[0019] Combined with attachment Figure 1-3 A composite oscillation generating device comprises an outer tube 19, an upper joint 18 and an oscillator 20 arranged in the outer tube 19, wherein the upper end of the outer tube 19 is threadedly connected to the upper joint 18, and the aforementioned oscillator 20 is composed of a base plate 22 and a cover plate 21. The oscillator 20 comprises an inlet 2 and an outlet 9, wherein the inlet 2 and the outlet 9 are connected to the hollow cylinder formed by the outer tube 19 to form a fluid channel for fluid to pass through. A guide block 4 is also provided in the oscillator 20, which divides the oscillator 20 into an oscillation chamber 5, a vortex chamber 6 and a feedback channel 3 for fluid circulation, wherein the inlet 2 is provided in the oscillation chamber 5, and the outlet 9 is provided in the vortex chamber 6. The oscillation chamber 5, the vortex chamber 6 and the feedback channel 3 are combined as a whole into a channel for fluid circulation and circulation. The liquid flow can generate a periodic force to push the left impact block 10 and the right impact block 11 to move.

[0020] The feedback channel 3 is formed by the left wall surface 7 and the right wall surface 8 of the oscillation cavity and the guide block 4 respectively. The upper joint fluid channel 1 is provided in the upper joint 18. The upper joint fluid channel 1 is connected to the inlet groove 16. The left impact block 10 can rotate around the left pin shaft 14, and the right impact block 11 can rotate around the right pin shaft 15. When stationary, the front ends of the two impact blocks contact the side wall of the wedge tip 13. When the liquid flows, the impact blocks are pushed and moved by the fluid pressure, rotate around the pin shaft, and the front ends of the impact blocks collide with the wall surface of the oscillation cavity.

[0021] In this technical solution, the fluid enters through the inlet 2 and flows out through the opening of the guide block 4. In order to give the fluid a certain initial velocity, the inlet 2 can be selected as one of the conical, straight or arc-shaped ones. The accelerated main jet enters the oscillation cavity 5. Affected by the turbulent effect, the liquid flow will gradually deviate from the central axis of the inlet 2 to one side to form a deflected jet. Subsequently, the deflected jet is separated by the wedge 13 and flows to one side. Figure 1Taking the case as an example, the liquid flow applies fluid pressure and impact force to the right collision block 11, and the right collision block 11 that contacts the wall of the wedge tip 13 moves under the action of pressure and impact force, and the right pin shaft 15 rotates. The front end of the right pin shaft collides with the right wall surface 8 of the oscillation chamber, generating vibration, and pushing the right collision block 11, the deflected liquid flow enters the vortex chamber 6, forming a clockwise high-speed rotating vortex, part of the liquid flow flows out through the outlet 9 into the outlet groove 17, and then enters the lower joint fluid channel 12 to leave, and part of the fluid passes through the right wall surface 8 of the oscillation chamber and enters the feedback channel Channel 3, impacting the channel wall. After circulating once in the feedback channel 3, the fluid re-enters the oscillation chamber 5 through the channel between the right impact block 11 and the guide block 4, and then pushes the left impact block 10 to rotate around the left pin 14, colliding with the left wall 7 of the oscillation chamber, causing the oscillator 20 to vibrate. At the same time, under the action of the fluid pressure, the right impact block 11, which has contacted the right wall 8 of the oscillation chamber after the collision, rotates around the right pin 15, and the front end of the impact block reconnects with the wedge tip 13, restoring the initial state when it was stationary, preparing for the next rotation and swing. At this time, the liquid flow returning to the oscillation chamber 5 through the feedback channel 3 merges with the new liquid flow entering from the inlet 2, pushing away the left impact block 10 and entering the vortex chamber 6, forming a vortex in the vortex chamber 6 in the opposite direction to the previous one. Part of the fluid leaves from the outlet 9, and part of the fluid enters the feedback channel 3, and then repeats the above process.

[0022] Therefore, through the fluid channel design of the oscillator 20, the liquid flow entering the oscillator can push the collision block periodically and regularly, so that the left and right collision blocks can alternately collide and hit the wall of the oscillation cavity. In addition, the impact force of the fluid on the entire oscillator wall during flow jointly forms axial and circumferential vibrations, generates periodic composite pressure fluctuations, forms pressure pulses, and drives the entire oscillator 20 to vibrate.

[0023] In order to ensure smooth flow of fluid in the fluid channel, an inlet groove 16 and an outlet groove 17 are provided on the cover plate 21 and the base plate 22, wherein the inlet groove 16 is provided at the upper end of the oscillator 20, connected to the upper joint fluid channel 1, and the outlet groove 17 is provided at the lower end of the oscillator 20, connected to the lower joint fluid channel 12. To ensure the sealing performance and uniformity of oscillation of the present application, the upper end of the axial-circumferential composite oscillator 20 is in contact with and sealed to the upper joint 18, and preferably a sealing gasket is provided between the two to ensure sealing performance; the lower end of the axial-circumferential composite oscillator 20 is in contact with and pressed against the outer tube 19.

[0024] The above description of the present invention and its embodiments is non-limiting, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the invention, without creatively designing a structure and embodiment similar to the technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. An axial-circumferential composite vibration drag reduction drill tool, characterized by: It comprises an outer tube (19), the upper end of the outer tube (19) is threadedly connected to an upper joint (18), an oscillator (20) is provided inside the outer tube (19), and the oscillator (20) comprises a cover plate (21) and a base plate (22); The oscillator (20) includes an inlet (2) and an outlet (9), the inlet (2) and the outlet (9) are respectively connected to the outer tube (19) to form a fluid channel for fluid to pass through, and the oscillator (20) is provided with a guide block (4), and the guide block (4) divides the interior of the oscillator (20) into a jet oscillation chamber (5), a vortex chamber (6), and a feedback channel (3) connecting the oscillation chamber (5) and the vortex chamber (6); The oscillator (20) is provided with a left bump block (10) and a right bump block (11) hingedly disposed on both sides of the inner jet oscillation cavity (5), and the oscillator (20) is provided with an oscillation cavity left wall surface (7) and an oscillation cavity right wall surface (8) cooperating with the left bump block (10) and the right bump block (11) on both sides. A wedge tip (13) is provided in the middle of the vortex chamber (6) below the left bumper (10) and the right bumper (11); The vortex chamber (6) is connected with a left pin shaft (14) and a right pin shaft (15) which respectively cooperate with the left bump block (10) and the right bump block (11) to swing; The cover plate (21) and the base plate (22) are respectively provided with an inlet groove (16) and an outlet groove (17) respectively connected to the inlet (2) and the outlet (9); the upper joint (18) is provided with an upper joint fluid channel (1) connected to the inlet groove (16); and the bottom of the outer tube (19) is provided with a lower joint fluid channel (12) connected to the outlet groove (17); The liquid flow exerts fluid pressure and impact force on the right collision block (11). The right collision block (11) that contacts the wall of the wedge tip (13) moves under the action of pressure and impact force, and the right pin shaft (15) rotates. The front end of the right pin shaft collides with the right wall surface (8) of the oscillation chamber, generating vibration, pushing the right collision block (11), and deflecting the liquid flow into the vortex chamber (6), forming a clockwise high-speed rotating vortex. Part of the liquid flow flows out through the outlet (9) into the outlet groove (17), and then enters the lower joint fluid channel (12) below to leave. Part of the fluid passes through the right wall surface (8) of the oscillation chamber and enters the feedback channel (3). The fluid impacts the channel wall, and after circulating once in the feedback channel (3), it re-enters the oscillation chamber (5) through the channel between the right impact block (11) and the guide block (4), and then pushes the left impact block (10) to rotate around the left pin shaft (14), colliding with the left wall surface (7) of the oscillation chamber, causing the oscillator (20) to vibrate. At the same time, under the action of the fluid pressure, the right impact block (11) that contacts the right wall surface (8) of the oscillation chamber rotates around the right pin shaft (15), and the front end of the impact block reconnects with the wedge tip (13), restoring the initial state when it was at rest, and preparing for the next rotation and swing.

2. The axial-circumferential composite vibration drag reduction drill tool according to claim 1, characterized in that: The inlet (2) is in the shape of a cone, a straight cone or a circular arc inlet.

3. The axial-circumferential composite vibration drag reduction drill tool according to claim 1, characterized in that: The upper end of the oscillator (20) contacts and seals the upper joint (18), and the lower end of the oscillator (20) contacts and seals the outer tube (19).

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