Start-stop multifunctional vibrator for coiled tubing

Abstract

This invention discloses a continuous tubular, startable, and stopable multifunctional oscillator, comprising: an upper connector, the upper end of which is screwed to an upper tubular column; a screw outer cylinder, screwed to the lower part of the upper connector, with a rubber sleeve on its inner wall; an oscillating outer cylinder, screwed to the lower end of the screw outer cylinder; a lower connector, screwed to the lower end of the oscillating outer cylinder; a screw shaft, located in the inner cavity of the screw outer cylinder and having a central channel for the screw shaft, with its outer circumferential spiral engaging with the rubber sleeve; a drive shaft, the upper end of which is connected to the lower end of the screw shaft via a lower universal joint, and extending downward along the axis of the oscillating outer cylinder and the lower connector; and an oscillation mechanism, driven by the drive shaft and located in the inner cavity of the oscillating outer cylinder or the lower connector. The inner cavity of the upper connector is provided with a switching mechanism for controlling the start and stop of the screw shaft; the oscillation mechanism includes a radial vibration mechanism, a rolling mechanism, and an axial vibration mechanism. This multifunctional oscillator can avoid the problem of jamming caused by impurities entering the device, and can realize the start and stop of the hydraulic oscillation function, avoiding idle operation and extending the service life of the device.

Description

Technical Field

[0001] This invention relates to a multifunctional oscillator, and more particularly to a startable and stopable multifunctional oscillator for continuous tubing, belonging to the field of continuous tubing tool technology. Background Technology

[0002] With the increasing development of unconventional oil and gas resources, and the continuous advancement of ultra-deep wells, horizontal wells, and extended-reach wells, coiled tubing operations are gaining popularity due to their high efficiency and low cost. However, in horizontal and extended-reach wells, the wellbore trajectory is complex and variable. Coiled tubing itself is relatively light, and as the tubing string extends deeper, the contact area between the wellbore and the wellbore wall increases, leading to a continuous increase in friction. During operations, drilling pressure cannot be transmitted to the bottom tools, making it extremely difficult to run coiled tubing in horizontal wells or areas with complex wellbore trajectories. Furthermore, during operations such as coiled tubing milling, issues such as pressure buildup and drill skipping can occur, severely impacting the efficiency and effectiveness of coiled tubing operations. This is a significant factor restricting the technological development of coiled tubing in horizontal and extended-reach well operations.

[0003] To address this issue, it is proposed to add a downhole mechanical device capable of generating a certain vibration to the coiled tubing tool string. Currently, this type of downhole mechanical device is called a hydraulic oscillator, and its development is relatively mature. Introducing a hydraulic oscillator into coiled tubing operations can generate periodic vibrations of a certain frequency and amplitude in the drill string, transforming the static friction of the drill string during the feeding process into dynamic friction. This has significant advantages in reducing frictional resistance during feeding, increasing mechanical drilling speed, increasing horizontal footage, and shortening the drilling cycle.

[0004] For example, Chinese invention patent application CN 115961889A discloses a rotary valve type hydraulic oscillator, which relates to the field of oilfield drilling technology. It includes an upper mandrel, an upper connector, a vibration generating mechanism, a rotary valve mechanism, and a lower connector. The upper connector is sleeved on the outer circumference of the upper mandrel, and the upper end of the upper connector is inserted into the outer wall of the upper mandrel. The lower end of the upper connector is connected to one end of the vibration generating mechanism. The upper end of the upper mandrel is used for the introduction of drilling fluid. The lower end of the upper mandrel is connected to the vibration generating mechanism and is internally connected. The outside of the rotary valve mechanism is an outer tube. The lower end of the vibration generating mechanism is connected to the upper end of the outer tube, and the lower end of the outer tube is connected to the upper end of the lower connector.

[0005] Similar existing hydraulic oscillators operate on the principle of water hammer. Their structure mainly consists of a power sub-section, a valve shaft assembly, and an oscillating sub-section. A turbine or screw motor in the power sub-section drives a moving valve plate to rotate continuously. The moving valve plate reciprocates on the upper surface of the stationary valve plate, constantly changing the flow area of ​​the flow channel, thus causing pressure fluctuations in the flow channel. This, in turn, drives the oscillating sub-section to vibrate the tubing string. Although hydraulic oscillators are widely used, existing hydraulic oscillators have the following problems and shortcomings:

[0006] 1. During operation, the end faces of the moving valve plate and the stationary valve plate are in close contact. Relying on the principle of hydraulics, the high-speed fluid scouring is prone to wear, resulting in a short tool life.

[0007] 2. The vibration frequency and amplitude of the existing hydraulic oscillator are determined entirely by the hydraulic parameters of the product flow channel structure. The vibration frequency and amplitude cannot be adjusted on-site according to the operation conditions, making it difficult to control the product operation effect and greatly reducing the performance.

[0008] 3. Existing hydraulic vibrators have high requirements for the working fluid. When the impurity content in the working fluid is high, the impurities can easily clog the moving valve plate, which can lead to pressure buildup and / or damage to other supporting tools.

[0009] 4. Existing hydraulic oscillators produce an oscillation effect during fluid circulation, which makes them unsuitable for certain working conditions where fluid circulation is required but the oscillator is not needed.

[0010] In summary, in order to meet the requirements of field use, there is an urgent need to develop a continuous, multi-functional, start-stop, multi-directional friction-reducing vibrator for pipe applications to improve operational efficiency. Summary of the Invention

[0011] The purpose of this invention is to overcome the problems existing in the prior art and provide a continuous tubular startable and stopable multifunctional oscillator that can avoid the problem of jamming caused by particulate impurities entering the device, and can realize the start and stop of the hydraulic oscillation function, avoid idle time operation, and extend the service life of the device.

[0012] To solve the above technical problems, the present invention provides a continuous tube startable and stopable multifunctional oscillator, comprising:

[0013] The upper connector, with its upper port screwed onto the upper tubing column;

[0014] The screw outer cylinder is screwed to the lower part of the upper connector, and the inner wall is provided with a rubber sleeve;

[0015] An oscillating outer cylinder is screwed onto the lower end of the screw outer cylinder;

[0016] The lower connector is screwed onto the lower end of the outer cylinder of the oscillating device;

[0017] The screw shaft is located in the inner cavity of the outer cylinder of the screw and has a central channel for the screw shaft. The outer circumferential spiral cooperates with the rubber sleeve.

[0018] The drive shaft has its upper end connected to the lower end of the screw shaft via a lower universal joint, and extends downward along the axis of the oscillating outer cylinder and the lower connector;

[0019] An oscillation mechanism, driven by the transmission shaft and located within the cavity of the outer oscillation cylinder or lower connector.

[0020] As an improvement of the present invention, the inner cavity of the upper connector is provided with a switching mechanism for controlling the start and stop of the screw shaft.

[0021] As a further improvement of the present invention, the oscillation mechanism includes a radial vibration mechanism, a rolling mechanism, and an axial vibration mechanism.

[0022] As a further improvement of the present invention, the radial vibration mechanism includes:

[0023] An eccentric wheel is fitted and fixed to the drive shaft;

[0024] The vibrating block is stepped in shape, wider on the inside and narrower on the outside, and is inserted into the square stepped hole of the outer vibrating cylinder;

[0025] An inner disc spring is placed at the bottom of the central countersunk hole of the vibrating block;

[0026] The vibrating rod has one end abutting against the circumference of the eccentric wheel, and the other end inserted into the central countersunk hole of the vibrating block and pressing against the inner disc spring.

[0027] The outer disc spring is located between the large end of the vibrating block and the bottom wall of the large hole of the square stepped hole.

[0028] As a further improvement of the present invention, four vibrating blocks are evenly arranged on the circumference of the outer oscillating cylinder.

[0029] As a further improvement of the present invention, the rolling mechanism includes:

[0030] A rotating disk is fitted and fixed on the drive shaft, and has a through vertical hole for the rotating disk. Multiple column heads are evenly distributed on the circumference of the lower end face.

[0031] Wear-resistant grooved wheels are fixed in the middle of the grooved wheel shaft, and the axis of each grooved wheel shaft is perpendicular to the axis of the transmission shaft and both ends are fixed on the lower joint;

[0032] The wear-resistant grooved wheels are symmetrically distributed around the axis of the drive shaft, and the outer edge of each wear-resistant grooved wheel protrudes outside the window of the lower joint. The outer circumference of the wear-resistant grooved wheel is evenly distributed with tooth grooves extending along a spiral line. The column head of the rotating disk is embedded in the tooth grooves to drive the wear-resistant grooved wheels to rotate continuously.

[0033] As a further improvement of the present invention, four wear-resistant grooved wheels are symmetrically distributed around the axis of the drive shaft, and the outer edge of each wear-resistant grooved wheel abuts against the inner wall of the well barrel and moves downward.

[0034] As a further improvement of the present invention, the lower sidewall of the rotating disk is uniformly provided with inclined holes that communicate with the top of the rotating disk, and fluid is flushed through the inclined holes of the rotating disk to flush the wear-resistant grooved wheel.

[0035] As a further improvement of the present invention, the axial vibration mechanism includes:

[0036] The impact disc is screwed onto the lower end of the drive shaft, and its outer circumference is clearance-fitted with the lower connector. Multiple protrusions are evenly provided on the circumference of the lower end face.

[0037] An impact shaft is located below the impact disc, and its upper end is provided with an expanded diameter impact shaft flange;

[0038] A spring seat is fixed to the lower inner step of the lower connector;

[0039] An impact shaft spring is supported between the impact shaft flange and the spring seat;

[0040] The impact wheels are mounted on the circumference of the impact shaft flange via a bracket and abut against the underside of the corresponding protrusions.

[0041] As a further improvement of the present invention, four sets of protrusions and impact wheels are provided. One side of the protrusion is provided with an inclined surface, and the other side is a vertical plane. When the impact disc rotates, the inclined surface of the protrusion gradually presses down the impact wheel. When it passes the protrusion, the impact shaft rebounds upward under the tension of the impact shaft spring and generates axial vibration.

[0042] As a further improvement of the present invention, a plurality of overflow oblique holes are evenly distributed on the lower circumference of the screw shaft.

[0043] As a further improvement of the present invention, the switching mechanism includes:

[0044] The flow divider is located in the middle inner cavity of the upper connector, and the lower expansion section has flow divider side holes evenly distributed on its circumference, which communicate with the lower expansion section of the upper connector.

[0045] The circulating piston has an outer piston flange at the top and a split structure. The outer piston flange abuts against the inner wall of the upper connector. The upper end of the central channel has a throat, and above the throat is a flared mouth for ball placement. The lower part is inserted into the inner cavity of the flow divider and piston flow holes are evenly distributed on the lower circumference.

[0046] A spring cylinder, the upper end of which is screwed to the lower port of the circulating piston;

[0047] A piston spring is fitted around the outer periphery of the spring cylinder and supported below the circulating piston, with its lower end supported on the mudguard ring formed by the reduced diameter section at the lower end of the distributor cylinder.

[0048] As a further improvement of the present invention, after the ball lands in the flared mouth at the upper end of the circulating piston, the circulating fluid pushes the circulating piston downward to open the piston flow hole. Part of the circulating fluid flows down along the central channel, and the other part enters the outer annulus of the diverter and drives the screw shaft to rotate. The screw shaft drives the oscillation mechanism to work.

[0049] The inner wall of the upper connector is provided with an upper expansion section below the outer flange of the piston. When the outer flange of the piston is located in the upper expansion section of the upper connector, the upper end of the circulating piston opens and the ball falls over the throat.

[0050] As a further improvement of the present invention, the outer periphery of the middle section of the circulating piston is provided with a W-shaped shifting groove that is connected end to end to form a closed loop, and a shifting pin is screwed into the upper screw hole of the flow divider, with the inner end of the shifting pin embedded in the W-shaped shifting groove.

[0051] As a further improvement of the present invention, the W-shaped shifting groove includes alternating upper short grooves and lower long grooves. Both the upper short grooves and the lower long grooves are parallel to the axis of the circulating piston. The lower end of each upper short groove is connected to the upper part of the adjacent lower long groove on the right side through a downward inclined groove. The upper end of each lower long groove is connected to the middle part of the adjacent upper short groove on the right side through an upward inclined groove. All upper short grooves have the same length and position in the axial direction. The lower long groove includes alternating oscillation excitation long grooves and oscillation closure long grooves. The lower ends of each oscillation excitation long groove are flush, and the lower ends of each oscillation closure long groove are flush. The lower end of the oscillation closure long groove is lower than the lower end of the oscillation excitation long groove.

[0052] As a further improvement of the present invention, the lower end of the diverter cylinder is supported above the connecting cylinder by a thrust bearing, and the lower end of the connecting cylinder is connected to the upper end of the screw shaft by an upper universal joint.

[0053] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The ball can be thrown to achieve the conversion between two modes of oscillation excitation and oscillation shutdown, which can be converted multiple times without having to remove the tool again; the multi-functional oscillator relies on the screw to drive the entire spindle component to rotate, and realizes hydraulic oscillation through mechanical principle, avoiding the damage to the product caused by relying on the water hammer principle to achieve oscillation, and there is no problem of short product life caused by high-speed fluid scouring;

[0054] 2. After the oscillation is started, three effects are generated by fluid excitation: radial vibration, axial vibration and rolling. The three effects work together to promote the drag reduction of the tool string, realize the efficient lowering and forward movement of the tubing string, improve work efficiency and effectively meet the work requirements.

[0055] 3. Multiple ball throws are possible without worrying about the ball clogging the water hole; the vibration function is used only when needed, avoiding overwork that could affect the product's actual lifespan. The flow channel is switched by a circulating piston under the action of a spring, and the ball falls and stops in the tool cavity after each throw, without affecting subsequent operations. The large cavity space can store multiple balls, meeting the needs of multiple function start-ups and stops.

[0056] 4. Radial vibration is achieved through the action of the eccentric wheel and controlled by the disc spring to make the radial vibration gentle, avoiding rigid impacts that could affect product life. Radial vibration accelerates the creep of the horizontal well section of the tubing string, increasing the operating footage speed.

[0057] 5. The rolling effect can directly make the tubing string move downward, promote the speed of the tubing string, and directly convert the rotation of the shaft into downward rotation through the rotating disk. Friction is generated between the shaft and the wellbore, and the downward movement directly provides the axial force of the tubing string downward, enhancing the effect of product function. It also has a self-cleaning function to prevent mud packing.

[0058] 6. Compared with oscillators that only produce a single impact effect, this drilling tool is more advanced. From the perspective of product structure, there is no complex fluid channel setting in the structure. When the vibration and impact effect is generated, there is no hydraulic impact inside the tool. The impact of the product is gentle and moderate, the tool itself is less damaged, and it also ensures that each component has a long service life. The overall processing and manufacturing difficulty is not high and the processability is good.

[0059] 7. This tool, while ensuring functionality, avoids the problems of traditional hydraulic oscillators relying on water hammer effect and friction affecting product lifespan.

[0060] 8. This tool eliminates the problem of particulate impurities entering the device and causing valve jamming. It reliably breaks the static friction between the coiled tubing and tool string and the wellbore. The principle is simple and effective, and the process is simple. It does not require the use of other tools. Only conventional ball dropping and increased flow operation are needed to achieve a multi-functional oscillation effect. It can ensure the smooth lowering of the coiled tubing tool string, accelerate the insertion speed of the coiled tubing string into the well, promote the forward efficiency of the coiled tubing string in complex well sections, and reduce various costs in drilling operations. Attached Figure Description

[0061] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0062] Figure 1 This is a schematic diagram of the continuous tube startable and stopable multifunctional oscillator of the present invention;

[0063] Figure 2 This is a schematic diagram of the W-shaped displacement groove on the outer wall of the circulating piston in this invention;

[0064] Figure 3 This is an unfolded view of the W-shaped displacement groove on the outer wall of the circulating piston in this invention;

[0065] Figure 4 A schematic diagram illustrating the principle behind triggering the opening motion after a throw;

[0066] Figure 5 This is a magnified front view of the radial vibration mechanism in this invention;

[0067] Figure 6 This is a cross-sectional view of the radial vibration mechanism in this invention;

[0068] Figure 7 This is a magnified front view of the rolling mechanism in this invention;

[0069] Figure 8 This is a schematic diagram of the rotating disk and wear-resistant grooved wheel transmission structure in this invention;

[0070] Figure 9 This is a magnified front view of the axial vibration mechanism in this invention;

[0071] In the diagram: 1. Upper connector; 1a. Upper expansion section of upper connector; 1b. Lower expansion section of upper connector; 2. Ball; 3. Circulating piston; 3a. Piston flow hole; 3b. W-shaped transposition groove; 3b1. Oscillating closing long groove; 3b2. Upper short groove; 3b3. Oscillating excitation long groove; 4. Diverter cylinder; 4a. Diverter cylinder expansion section; 4b. Diverter side hole; 5. Transposition pin; 6. Diverter cylinder outer seal; 7. Diverter cylinder inner seal; 8. Piston spring; 9. Mudguard ring; 10. Thrust bearing; 11. Combined seal; 12. Spring sleeve; 13. Connecting cylinder; 14. Upper universal joint; 15. Rubber sleeve; 16. Screw shaft; 16a. Overflow oblique hole; 17. Screw outer cylinder; 18. Lower universal joint; 19. Drive shaft; 20. Oscillating outer cylinder; 21. Radial vibration mechanism; 21a. Shaft retaining ring; 21b. Outer disc spring; 21c. Vibrating block; 21d. Inner disc spring; 21e. Vibrating rod; 21f. Eccentric wheel; 21g. Flat key; 22. Rolling mechanism; 22a. Rotary disk; 22a1. Column head; 22a2. Vertical hole of rotating disk; 22a3. Inclined hole of rotating disk; 22b. Wear-resistant grooved wheel; 22c. Radial bearing; 22d. Grooved wheel shaft; 22e. Flat key; 23. Axial vibration mechanism; 23a. Impact disk; 23a1. Flow hole of impact disk; 23a2. Protrusion; 23b. Wheel axle; 23c. Impact wheel; 23d. Impact shaft; 23d1. Impact shaft flange; 23e. Impact shaft spring; 23f. Spring seat; 24. Lower connector. Detailed Implementation

[0072] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0073] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0075] like Figure 1 As shown, the continuous tube startable multifunctional oscillator of the present invention includes an upper connector 1, a circulating piston 3, a flow divider 4, a screw shaft 16, a screw outer cylinder 17, a drive shaft 19, an oscillating outer cylinder 20, a radial vibration mechanism 21, a rolling mechanism 22, an axial vibration mechanism 23, and a lower connector 24. The uppermost upper connector 1 is connected to the upper tube column. The flow divider 4 is installed in the inner cavity of the upper connector 1. The circulating piston 3 is installed in the upper inner cavity of the flow divider 4. The upper half of the circulating piston 3 has a split structure, which can be expanded or reduced. The upper part is provided with an outer flange of the piston, and the outer flange of the piston abuts against the inner wall of the upper connector 1, so that the upper half of the circulating piston 3 is in a contracted state. The upper end of the central channel of the circulating piston 3 is provided with a reduced-diameter throat, and the upper end of the throat is provided with a flared mouth. The inner wall of the upper connector 1, below the outer flange of the piston, is provided with an upper expansion section 1a, which provides space for the outer flange of the piston to expand.

[0076] After ball 2 is inserted, it falls into the flared mouth at the upper end of the circulating piston 3. The fluid pushes the circulating piston 3 downward. When the outer flange of the piston reaches the expansion section 1a of the upper connector, the outer flange of the piston at the upper part of the circulating piston 3 loses its constraint and opens up. Ball 2 passes through the throat and falls down along the large diameter central channel of the circulating piston 3.

[0077] The middle section of the circulating piston 3 is provided with a W-shaped shifting groove 3b. A shifting pin 5 is screwed into the threaded hole at the top of the flow divider 4. The inner end of the shifting pin 5 is embedded in the W-shaped shifting groove 3b of the circulating piston 3. The W-shaped shifting groove 3b is evenly and circulated around the outer periphery of the circulating piston 3 and is connected end to end to form a closed loop.

[0078] When the circulating piston 3 moves up and down, the inner end of the shifting pin 5 is limited in the W-shaped shifting groove 3b, so that the W-shaped shifting groove 3b realizes circumferential shifting. Each shift, the circulating piston 3 rotates by an angle, for example, 30° each time, and shifts the grooves in the circumferential direction.

[0079] like Figure 2 and Figure 3 As shown, the W-type transposition groove includes alternating upper short grooves 3b2 and lower long grooves. Both the upper short grooves 3b2 and the lower long grooves are parallel to the axis of the circulating piston. The lower end of each upper short groove 3b2 is connected to the upper part of the adjacent lower long groove on the right through a downward inclined groove. The upper end of each lower long groove is connected to the middle part of the adjacent upper short groove 3b2 on the right through an upward inclined groove. All upper short grooves 3b2 have the same length and position in the axial direction. The lower long groove includes alternating oscillation closing long grooves 3b1 and oscillation excitation long grooves 3b3. The lower ends of each oscillation excitation long groove 3b3 are flush, and the lower ends of each oscillation closing long groove 3b1 are flush. The lower end of the oscillation closing long groove 3b1 is lower than the lower end of the oscillation excitation long groove 3b3.

[0080] The lower circumference of the circulating piston 3 is uniformly provided with a plurality of piston flow holes 3a extending vertically. Before the ball is thrown, the outer port of the piston flow hole 3a abuts against the inner wall of the diverter cylinder 4, that is, the piston flow hole 3a is in the closed state. At this time, the shifting pin 5 is embedded in the bottom of the oscillation closing groove 3b1.

[0081] The upper outer wall of the diverter cylinder 4 is fitted with an outer seal 6, which seals with the inner wall of the upper connector 1. The upper inner wall of the circulating piston 3 is fitted with an inner seal 7, which seals with the middle outer wall of the circulating piston 3.

[0082] The circulating piston 3 and the diverter cylinder 4 slide against each other. A piston spring 8 is provided between the diverter cylinder 4 and the circulating piston 3. The elastic force of the piston spring 8 provides the reciprocating motion conditions for the interaction between the two. The piston spring 8 is fitted on the outer circumference of the spring cylinder 12. The upper end of the spring cylinder 12 is screwed into the lower end of the circulating piston 3.

[0083] The inner wall of the flow divider 4 is provided with a flow divider expansion section 4a at a position lower than the piston flow passage 3a, forming an annular channel around the outer periphery of the spring cylinder 12. A reduced-diameter mudguard ring 9 is provided at the lower end of the flow divider 4, below the flow divider expansion section 4a. The lower end of the spring cylinder 12 passes through the mudguard ring 9 and is inserted into the upper inner cavity of the connecting cylinder 13. The inner wall of the mudguard ring 9 is fitted with a combined seal 11 to achieve a seal with the outer wall of the spring cylinder 12.

[0084] Multiple diversion side holes 4b are evenly distributed on the lower part of the diversion cylinder 4. The diversion side holes 4b are located above the mudguard ring 9. The annular space between the inner wall of the upper connector lower expansion section 1b at the lower part of the upper connector 1 and the outer wall of the diversion cylinder 4 and the connecting cylinder 13 forms an annular flow channel. The annular space between the inner wall of the diversion cylinder expansion section 4a and the outer wall of the spring cylinder 12 is connected to the annular flow channel on the outer periphery of the diversion cylinder 4 through the diversion side holes 4b.

[0085] A thrust bearing 10 is installed between the bottom of the diverter cylinder 4 and the top of the connecting cylinder 13, so that the upper diverter cylinder 4 will not be driven when the lower screw shaft 16 rotates. The lower end of the connecting cylinder 13 is connected to the upper end of the screw shaft 16 through the upper universal joint 14. The screw shaft 16 is installed in the inner cavity of the screw outer cylinder 17. The inner wall of the screw outer cylinder 17 is provided with a rubber sleeve 15 to cooperate with the screw shaft 16. The length of the screw shaft 16 and the rubber sleeve 15 is sufficient to meet the usage requirements.

[0086] The lower circumference of the screw shaft 16 is provided with uniformly arranged overflow oblique holes 16a. The overflow oblique holes 16a are located below the section where the screw shaft 16 and the rubber sleeve 15 mate. Each overflow oblique hole 16a extends obliquely downward and outward and is continuous. The inner port of each overflow oblique hole 16a is connected to the central channel of the screw shaft 16, and the outer port of each overflow oblique hole 16a is connected to the annular space between the outer wall of the screw shaft 16 and the outer cylinder 17 of the screw.

[0087] The central channel between the overflow oblique hole 16a and the screw hole at the lower end of the screw shaft 16 is a space for accommodating the ball, which can accommodate multiple falling balls 2 to meet the needs of multiple ball throws.

[0088] The lower end of the screw shaft 16 is connected to the upper end of the drive shaft 19 through the lower universal joint 18. The drive shaft 19 is located in the inner cavity of the oscillating outer cylinder 20. The upper end of the oscillating outer cylinder 20 is connected to the lower end of the screw outer cylinder 17 through a thread.

[0089] The drive shaft 19 is equipped with a radial vibration mechanism 21, a rolling mechanism 22 and an axial vibration mechanism 23, which are installed from top to bottom to meet the requirements of radial and axial vibration at the same time. The simultaneous operation of the three mechanisms can greatly improve the efficiency of lowering the tubing string.

[0090] like Figure 5 , Figure 6 As shown, the radial vibration mechanism 21 has an eccentric wheel 21f installed at a corresponding position on the transmission shaft 19. The eccentric wheel 21f is axially fixed in a suitable position by a shaft retaining ring 21a. The eccentric wheel 21f is connected to the transmission shaft 19 by a flat-head key 21g. The corresponding oscillating outer cylinder 20 has four radially penetrating square stepped holes evenly arranged on its circumference. Vibration blocks 21c are inserted into each square stepped hole. Each vibration block 21c can have a square cross-section at the small end and a circular cross-section at the large end to prevent rotation. The corresponding small hole through the square stepped hole is a square hole, and the large end is a circular countersunk hole. An outer disc spring 21b is provided between the large end flange of the vibration block 21c and the bottom of the large hole of the square stepped hole.

[0091] The inner ends of each vibrating rod 21e abut against the outer periphery of the eccentric wheel 21f, and the outer ends of each vibrating rod 21e are inserted into the countersunk hole of the vibrating block 21c and pressed against the inner disc spring 21d. Each inner disc spring 21d is placed at the bottom of the countersunk hole of the vibrating block 21c.

[0092] As the drive shaft 19 rotates, the outer circumference of the eccentric wheel 21f pushes the vibrating rod 21e to perform radial reciprocating motion. The vibrating rod 21e pushes the inner disc spring 21d, which flexibly transmits the vibration to the vibrating block 21c. The eccentric wheel 21f rotates one revolution with the drive shaft 19, and the four vibrating blocks 21c sequentially realize reciprocating vibration along the radial direction of the tool.

[0093] like Figure 7 , Figure 8 As shown, in the rolling mechanism 22, the rotating disk 22a is fixed to the transmission shaft 19 by a flat key 22e and rotates with the transmission shaft 19. The lower connector 24 has four openings on its circumference and a grooved wheel shaft 22d is installed in the opening. A wear-resistant grooved wheel 22b is installed on the grooved wheel shaft 22d. A radial bearing 22c is installed between the wear-resistant grooved wheel 22b and the grooved wheel shaft 22d. The outer circumference of the wear-resistant grooved wheel 22b is evenly provided with multiple tooth grooves extending along a spiral line. The column head 22a1 below the rotating disk 22a is inserted into the tooth groove of the wear-resistant grooved wheel 22b. When the rotating disk 22a rotates, the wear-resistant grooved wheel 22b also rotates, forming a rolling effect and driving the entire tube string to move downward.

[0094] like Figure 9 As shown, the axial vibration mechanism 23 includes an impact disk 23a connected to the lowermost end of the drive shaft 19 via a thread. The outer periphery of the impact disk 23a abuts against the inner wall of the lower connector 24 and can slide up and down. Axially through-holes 23a1 are evenly distributed on the end face circumference of the impact disk 23a to ensure fluid circulation. Four centrally symmetrically distributed protrusions 23a2 are provided on the bottom circumference of the impact disk 23a. One side of each protrusion 23a2 is an inclined surface, and the other side is a vertical plane.

[0095] A spring seat 23f is installed on the lower inner step of the vibrating outer cylinder 20. The inner circumference of the spring seat 23f is uniformly provided with axial flow holes. An impact shaft spring 23e is supported above the spring seat 23f. The impact shaft spring 23e is fitted on the outer circumference of the impact shaft 23d. The upper end of the impact shaft 23d is provided with an impact shaft flange 23d1. The impact shaft flange 23d1 presses against the upper end of the impact shaft spring 23e. The impact shaft flange 23d1 is uniformly provided with axially penetrating flow holes.

[0096] Four impact wheels 23c are installed on the circumference of the top end face of the impact shaft flange 23d1. Each impact wheel 23c has a wheel axle 23b extending radially along the tool installed at its center. When the drive shaft 19 drives the impact disc 23a to rotate, the top of the impact wheel 23c rolls against the protrusion 23a2, and axial vibration is generated under the action of the impact shaft spring 23e.

[0097] like Figure 4As shown, during continuous tube operation, if the oscillator needs to be turned on, a ball is thrown. When ball 2 is thrown, it lands in the upper flared end of the circulating piston 3, sealing the central channel. At this time, under the action of the circulating fluid, ball 2 pushes the circulating piston 3 downward, and the shifting pin 5 moves upward along the W-shaped shifting groove 3b on the circulating piston 3, sliding from the lower end of the oscillation closing long groove 3b1 to the upper end of the upper short groove 3b2. When the circulating piston 3 moves downward to the expansion section 1a on the upper connector, it elastically opens, and ball 2 falls to the bottom of the screw shaft 16. Under the tension of the piston spring 8... Under the action of force, the circulating piston 3 floats up a short distance, and the shifting pin 5 slides from the upper end of the upper short groove 3b2 to the lower end of the oscillation excitation long groove 3b3 and stops. At this time, the piston flow hole 3a reaches the expansion section 4a of the flow divider, that is, the piston flow hole 3a is in the open position. At this time, the fluid is divided into two parts. One part flows down along the central channel, and the other part flows out from the piston flow hole 3a and enters the inner cavity of the expansion section 4a of the flow divider. Then it flows into the annular flow channel along the flow divider side hole 4b on the flow divider 4, and then goes down into the inner cavity of the rubber sleeve 15, driving the entire screw shaft 16 to rotate, thereby making the oscillator start working.

[0098] After ball 2 completes the above actions, screw shaft 16 begins to rotate, driving lower universal joint 18 to drive transmission shaft 19 to transmit power from top to bottom, causing radial vibration mechanism 21, rolling mechanism 22, and axial vibration mechanism 23 to start working, thereby completing rolling, inner radial vibration, and axial vibration within the sleeve.

[0099] The principle of radial vibration inside the casing is as follows: Figure 5 , Figure 6 As shown, the drive shaft 19 drives the eccentric wheel 21f to rotate via the flat-head key 21g. During the rotation, the eccentric wheel 21f and each vibrating rod 21e form a cam mechanism, which causes the vibrating rod 21e to continuously compress the inner disc spring 21d to push each vibrating block 21c, causing each vibrating block 21c to reciprocate. The four vibrating blocks 21c circulate radially. The outer disc spring 21b plays the role of rebounding and retracting the vibrating blocks 21c, while the shaft retaining ring 21a plays the role of axial limiting for the entire radial vibration mechanism 21.

[0100] The principle of the rolling mechanism is as follows: Figure 7 and Figure 8 As shown, the drive shaft 19 drives the rotating disk 22a to rotate via the flat key 22e. The column head 22a1 extending downward from the outer edge of the rotating disk 22a is embedded in the tooth groove of the wear-resistant grooved wheel 22b. During the sliding along the tooth groove, it drives the wear-resistant grooved wheel 22b to rotate around the grooved wheel shaft 22d. The radial bearing 22c is installed between the grooved wheel shaft 22d and the wear-resistant grooved wheel 22b to ensure smooth rotation.

[0101] The rotating disk 22a has vertically downward rotating disk holes 22a2 evenly distributed around its circumference near the center for fluid passage. Simultaneously, the lower sidewall of the rotating disk 22a has evenly distributed inclined rotating disk holes 22a3 communicating with the top of the rotating disk 22a. Fluid flows through the inclined rotating disk holes 22a3 to flush the wear-resistant grooved wheel 22b, preventing it from being covered in mud and affecting its rolling. During its rolling, the wear-resistant grooved wheel 22b travels downwards along the inner wall of the wellbore, driving the entire tool string downwards and improving the efficiency of the tubing string lowering.

[0102] The wear-resistant grooved wheel 22b is made of high-strength wear-resistant alloy steel to ensure the effectiveness of the contact friction between the wear-resistant grooved wheel 22b and the wellbore wall, thus ensuring the downward movement effect.

[0103] The principle of axial vibration mechanism 23 is as follows: Figure 9 As shown, when the drive shaft 19 drives the lower impact disc 23a to rotate, the four protrusions 23a2 at the bottom of the impact disc 23a press against the top of the impact wheel 23c. The impact wheel 23c rolls to reduce friction with the protrusions 23a2. When the impact wheel 23c moves relative to the lowest point of the protrusions 23a2 along the inclined plane, it pushes the impact shaft 23d downward, simultaneously compressing the impact shaft spring 23e to store energy. When the impact wheel 23c moves relative to the end of the protrusions 23a2, that is, when it reaches the vertical plane of the protrusions 23a2, under the tension of the impact shaft spring 23e, the impact shaft 23d quickly rebounds upward, generating axial vibration impact. As the impact disc 23a rotates, it is affected by the rising and falling of the protrusions 23a2, causing the impact wheel 23c to synchronously vibrate up and down with the impact shaft 23d, i.e., generating an axial vibration oscillation effect, which improves the working efficiency of the entire tool string.

[0104] The axial vibration mechanism does not affect the flow of fluid. The fluid can reach the bottom of the impact disk 23a through the axial through hole on the impact disk 23a, flow downward through the axial through hole on the impact shaft flange 23d1, and then flow downward through the axial through hole on the spring seat 23f.

[0105] like Figure 2 and Figure 4As shown, when coiled tubing is difficult in horizontal wells, this multi-functional oscillator operates in oscillation mode by dropping a ball. After the operation is completed and no further oscillation is needed, the oscillation can be stopped by dropping the ball again. Ball 2 lands on the circulating piston 3. Under the action of the circulating fluid, ball 2 pushes the circulating piston 3 downward. The shifting pin 5 moves upward relative to the top of the upper short groove 3b2 along the W-shaped shifting groove 3b on the circulating piston 3. When the circulating piston 3 moves downward to the expansion section 1a on the upper connector, it elastically opens. Ball 2 falls down to the bottom of the screw shaft 16. Under the tension of the piston spring 8, the circulating piston 3 floats up a long distance, causing the shifting pin 5 to stay at the lower end of the oscillating closing long groove 3b1 of the W-shaped shifting groove 3b. At this time, the piston flow hole 3a is located above the expansion section 4a of the diverter cylinder, that is, the piston flow hole 3a returns to the closed position. At this time, the circulating fluid flows downward along the central channel of the diverter cylinder 4. The annular flow channel outside the diverter cylinder 4 no longer flows. The entire screw shaft 16 is no longer driven to rotate. The circulating fluid finally flows out from the symmetrically distributed overflow oblique holes 16a at the bottom of the screw shaft 16.

[0106] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A start-stop multi-functional oscillator for coiled tubing, characterized by, include: The upper connector, with its upper port screwed onto the upper tubing column; The screw outer cylinder is screwed to the lower part of the upper connector, and the inner wall is provided with a rubber sleeve; An oscillating outer cylinder is screwed onto the lower end of the screw outer cylinder; The lower connector is screwed onto the lower end of the outer cylinder of the oscillating device; The screw shaft is located in the inner cavity of the outer cylinder of the screw and has a central channel for the screw shaft. The outer circumferential spiral cooperates with the rubber sleeve. The drive shaft has its upper end connected to the lower end of the screw shaft via a lower universal joint, and extends downward along the axis of the oscillating outer cylinder and the lower connector; An oscillation mechanism, driven by the transmission shaft and located within the cavity of the outer oscillation cylinder or lower connector; The oscillation mechanism includes a radial vibration mechanism, a rolling mechanism, and an axial vibration mechanism. The radial vibration mechanism includes: An eccentric wheel is fitted and fixed to the drive shaft; The vibrating block is stepped in shape, wider on the inside and narrower on the outside, and is inserted into the square stepped hole of the outer vibrating cylinder; An inner disc spring is placed at the bottom of the central countersunk hole of the vibrating block; The vibrating rod has one end abutting against the circumference of the eccentric wheel, and the other end inserted into the central countersunk hole of the vibrating block and pressing against the inner disc spring. The outer disc spring is located between the large end of the vibrating block and the bottom wall of the large hole of the square stepped hole; The rolling mechanism includes: A rotating disk is fitted and fixed on the drive shaft, and has a through vertical hole for the rotating disk. Multiple column heads are evenly distributed on the circumference of the lower end face. Wear-resistant grooved wheels are fixed in the middle of the grooved wheel shaft, and the axis of each grooved wheel shaft is perpendicular to the axis of the transmission shaft and both ends are fixed on the lower joint; The wear-resistant grooved wheels are symmetrically distributed around the axis of the drive shaft, and the outer edge of each wear-resistant grooved wheel protrudes outside the window of the lower joint. The outer circumference of the wear-resistant grooved wheel is evenly distributed with tooth grooves extending along a spiral line. The column head of the rotating disk is embedded in the tooth grooves to drive the wear-resistant grooved wheels to rotate continuously. The axial vibration mechanism includes: The impact disc is screwed onto the lower end of the drive shaft, and its outer circumference is clearance-fitted with the lower connector. Multiple protrusions are evenly provided on the circumference of the lower end face. An impact shaft is located below the impact disc, and its upper end is provided with an expanded diameter impact shaft flange; A spring seat is fixed to the lower inner step of the lower connector; An impact shaft spring is supported between the impact shaft flange and the spring seat; The impact wheels are mounted on the circumference of the impact shaft flange by a bracket and abut against the bottom of the corresponding protrusions. The protruding blocks and impact wheels are provided in four sets. One side of the protruding block has an inclined surface, and the other side is a vertical plane. When the impact disc rotates, the inclined surface of the protruding block gradually presses down the impact wheel. When it passes the protruding block, the impact shaft rebounds upward under the tension of the impact shaft spring, generating axial vibration.

2. The start-stop multi-functional vibrator for coiled tubing of claim 1, wherein, The inner cavity of the upper connector is equipped with a switching mechanism for controlling the start and stop of the screw shaft.

3. The start-stop multi-functional vibrator for coiled tubing of claim 1, wherein, The vibrating blocks are evenly distributed on the circumference of the outer oscillating cylinder.

4. The start-stop multi-functional vibrator for coiled tubing of claim 1, wherein, The wear-resistant grooved wheels are symmetrically distributed around the axis of the drive shaft, and the outer edge of each wear-resistant grooved wheel abuts against the inner wall of the well barrel and moves downward.

5. The start-stop multi-functional vibrator for coiled tubing of claim 1, wherein, The lower sidewall of the rotating disk is uniformly provided with inclined holes that communicate with the top of the rotating disk, and fluid is used to flush the wear-resistant grooved wheel through the inclined holes.

6. The start-stop multi-functional vibrator for coiled tubing of claim 1, wherein, The lower circumference of the screw shaft has multiple overflow oblique holes that are evenly distributed downwards.

7. The start-stop multi-functional vibrator for coiled tubing of claim 2, wherein, The switching mechanism includes: The flow divider is located in the middle inner cavity of the upper connector, and the lower expansion section has flow divider side holes evenly distributed on its circumference, which communicate with the lower expansion section of the upper connector. The circulating piston has an outer piston flange at the top and a split structure. The outer piston flange abuts against the inner wall of the upper connector. The upper end of the central channel has a throat, and above the throat is a flared mouth for ball placement. The lower part is inserted into the inner cavity of the flow divider and piston flow holes are evenly distributed on the lower circumference. A spring cylinder, the upper end of which is screwed to the lower port of the circulating piston; A piston spring is fitted around the outer periphery of the spring cylinder and supported below the circulating piston, with its lower end supported on the mudguard ring formed by the reduced diameter section at the lower end of the distributor cylinder.

8. The continuous tube startable and stopable multifunctional oscillator according to claim 7, characterized in that, After the ball lands in the flared mouth at the top of the circulating piston, the circulating fluid pushes the circulating piston downward to open the piston flow hole. Part of the circulating fluid goes down along the central channel, and the other part enters the outer annulus of the distributor and drives the screw shaft to rotate. The screw shaft drives the oscillation mechanism to work. The inner wall of the upper connector is provided with an upper expansion section below the outer flange of the piston. When the outer flange of the piston is located in the upper expansion section of the upper connector, the upper end of the circulating piston opens and the ball falls over the throat.

9. The continuous tube startable and stopable multifunctional oscillator according to claim 7, characterized in that, The middle section of the circulating piston is provided with a W-shaped shifting groove that is connected end to end to form a closed loop. A shifting pin is screwed into the upper screw hole of the flow divider, and the inner end of the shifting pin is embedded in the W-shaped shifting groove.

10. The continuous tube startable and stopable multifunctional oscillator according to claim 9, characterized in that, The W-shaped transposition groove includes alternating upper short grooves and lower long grooves, both of which are parallel to the axis of the circulating piston. The lower end of each upper short groove is connected to the upper part of the adjacent lower long groove on the right through a downward-sloping lower groove, and the upper end of each lower long groove is connected to the middle part of the adjacent upper short groove on the right through an upward-sloping upper groove. All upper short grooves have the same length and position in the axial direction. The lower long groove includes alternating oscillation excitation long grooves and oscillation closure long grooves. The lower ends of each oscillation excitation long groove are flush, and the lower ends of each oscillation closure long groove are flush, with the lower end of the oscillation closure long groove lower than the lower end of the oscillation excitation long groove.

11. The continuous tube startable and stopable multifunctional oscillator according to claim 7, characterized in that, The lower end of the diverter cylinder is supported above the connecting cylinder by a thrust bearing, and the lower end of the connecting cylinder is connected to the upper end of the screw shaft by an upper universal joint.

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