Hydraulic whipstock close to well wall
By using a single-cylinder hydraulic guide valve that rests against the well wall, and employing a wedge-shaped support slip and a conical design, the problems of complex and wasteful guide valve structures have been solved, achieving the effects of simplified processing, reduced costs, and improved window opening efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2026-03-03
AI Technical Summary
Existing non-recoverable guide vanes are complex in structure, difficult to manufacture, and wasteful in side-drilling wells where guide vanes do not need to be recovered.
The wellbore hydraulic guide tool with a single-cylinder structure uses a wedge-shaped support slip and a conical body design. The drilling fluid pushes the conical body and plunger to slide in opposite directions, pushing the support slip and longitudinal slip to extend, so that the back of the guide tool's wedge iron is in contact with the wellbore wall, eliminating gaps and setting the seal.
The simplified guide vane structure reduces manufacturing difficulty and cost, while ensuring the smoothness and efficiency of window opening operations, avoiding drill string collisions and jamming problems, making it suitable for sidetracking wells that do not require guide vane retrieval.
Smart Images
Figure CN223964432U_ABST
Abstract
Description
Technical Field
[0001] This utility model pertains to well repair tools, and specifically relates to a hydraulic guide device that rests against the well wall. Background Technology
[0002] A guide vane is a tool used for sidetracking and windowing in a well. Existing guide vanes can be divided into two types: retrievable and non-retrievable, with non-retrievable guide vanes being more commonly used. Due to the guide vane's high rigidity and long axial dimension, to ensure its smooth deployment to the predetermined position in the well, its diameter is generally 8-10 mm smaller than the casing's inner diameter and it is centered in the wellbore after setting. Therefore, there is inevitably a 4-5 mm gap between the top outer edge of the guide vane's wedge and the wellbore wall. This creates a protruding jamming edge at the top of the guide vane's wedge in the wellbore. During subsequent sidetracking operations, the drill bit, drilling tools, logging instruments, and completion casing may collide with or even be obstructed when passing through this area. This is especially problematic when using cylindrical fishing tools to handle complex downhole conditions or when using coring tools, as these tools are prone to getting stuck at this point and unable to pass through.
[0003] To address the aforementioned issues, CN218971113U discloses a retrievable hydraulic guide tool that rests against the well wall, comprising a hollow joint, an infeeder, a guide tool wedge, and a setting and anchoring device connected in sequence. Its key feature is that a well wall-resting device is provided between the guide tool wedge and the setting and anchoring device. This device includes a plunger sleeve and supporting slips. Inside the plunger sleeve are a plunger and an upper limit tube connected to each other. The upper end of the plunger sleeve is fixedly connected to the guide tool wedge, and the lower end is connected to the cylinder sleeve of the setting and anchoring device via a core. The joint is fixedly connected, with the two ends of the central hole of the core joint being fixedly connected to the lower end of the upper limit tube and the upper end of the central tube of the setting and anchoring device, respectively. Multiple strip-shaped holes are evenly distributed on the outer wall of the upper limit tube for introducing drilling fluid into the plunger sleeve to push the plunger upward. The support slip is wedge-shaped and fixed in the wedge-shaped groove at the lower end of the guide wedge with shear screws. The center line of the inclined surface of the support slip is aligned with the center line of the inclined surface of the guide wedge, and the lower end is inserted into the plunger sleeve and rests against the top surface of the plunger. A jet tube is inserted between the plunger and the central hole of the guide wedge.
[0004] This guide rail allows the back of the inclined iron to adhere to the well wall and can be recovered after sidetracking. However, the overall structure of the guide rail is relatively complex, making it difficult to process and manufacture, and the manufacturing cost is high. Moreover, since there are relatively few branch wells and fishbone wells in the current oilfield, most sidetracked wells do not require the recovery of the guide rail. Using the above-mentioned recoverable hydraulic guide rail that adheres to the well wall for sidetracked wells that do not require the recovery of the guide rail is a waste of resources and causes a great deal of waste. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide a hydraulic guide device that is simple in structure and easy to process and manufacture, especially suitable for side-drilling wells that do not require the recovery of the guide device.
[0006] The technical solution of this utility model is as follows:
[0007] A hydraulic guide tool for wellbore drilling includes a guide wedge and a setting and anchoring device connected sequentially below an infeeder or milling cone. A wedge-shaped support slip is fixed in a wedge-shaped groove at the lower end of the guide wedge by shear screws. The support slip is aligned with the center line of the inclined surface of the guide wedge. The setting and anchoring device includes a conical body and a limiting tube disposed within a cylinder liner. Radial slips are evenly distributed along the circumferential direction on the outer edge of the conical body by shear screws. Its characteristic feature is:
[0008] The setting and anchoring device also includes a plunger located inside the cylinder liner above the conical body. The lower end of the plunger is fixedly connected to the upper end of the limiting tube. The supporting slip is embedded in the notch at the upper end of the cylinder liner and abuts against the upper end face of the plunger. Two wedge-shaped limiting grooves are symmetrically provided on the outer edge of the plunger. Longitudinal slips that can extend from the window on the cylinder liner are fixed in the limiting grooves by shear screws. The two longitudinal slips are located on both sides of the supporting slip. A jet tube is connected between the upper end of the plunger and the wedge of the guide.
[0009] As a further preferred embodiment, the slope ratio of the wedge-shaped groove to the limiting groove is 1.8:1 to 2.0:1, and the slope of the limiting groove is equal to the taper of the outer edge of the cone-shaped body.
[0010] As a further preferred option, the two longitudinal slips are arranged perpendicular to the supporting slips.
[0011] As a further preferred embodiment, the conical body and the limiting tube are connected by a fine-tooth sawtooth thread, with the thread tips on the limiting tube facing downwards, so that the conical body and the plunger can slide in opposite directions under the push of the drilling fluid, thereby pushing the radial slips and longitudinal slips out of the cylinder liner to achieve setting.
[0012] As a further preferred embodiment, the upper end of the cone and the outer edge of the plunger are fitted with the inner wall of the cylinder liner through a sliding clearance, and O-rings are respectively provided between the outer edges of the opposite ends of the cone and the plunger and the cylinder liner.
[0013] As a further optimization, multiple strip holes are evenly distributed around the circumference of the limiting tube, so that the drilling fluid entering the cylinder liner can push the cone and the plunger to slide in opposite directions.
[0014] As a further preferred embodiment, a ball seat is provided at the lower end of the cone-shaped body, and a seated ball is engaged therein.
[0015] The beneficial effects of this utility model are:
[0016] 1. Since the setting and anchoring device also includes a plunger located above the conical body inside the cylinder liner, with the lower end of the plunger fixedly connected to the upper end of the limiting tube, when drilling fluid enters between the conical body and the plunger through the limiting tube, it can push the conical body and the plunger to slide in opposite directions. This pushes the support slip, which rests against the upper end face of the plunger, out of the wedge-shaped groove and gradually presses the back of the guide wedge against the well wall, thereby eliminating the gap between the guide wedge and the well wall and preventing the top of the guide wedge from forming an abrupt jamming edge in the wellbore; not only in During milling cone window opening operations, the amplitude of the inclined surface of the guide wedge is reduced, making the window opening operation more stable, avoiding milling cone tooth damage, and improving the window opening speed and efficiency. Moreover, it can avoid collisions and obstructions of drill bits, drilling tools, logging instruments, completion casing or core sampling tools when passing the top of the guide wedge during subsequent sidetracking operations. Especially when it is necessary to use cylindrical fishing tools to deal with complex downhole conditions or to use core sampling tools, it can ensure that the cylindrical fishing tools or core sampling tools can pass smoothly through the top of the guide wedge into the window and the new sidetracked wellbore.
[0017] 2. Because two wedge-shaped limiting grooves are symmetrically provided on the outer edge of the plunger, and longitudinal slips that can extend from the window on the cylinder liner are fixed in the limiting grooves by shear screws. The two longitudinal slips are arranged perpendicular to the supporting slips. Therefore, when the drilling fluid pushes the cone and the plunger to slide in opposite directions, the radial slips and the longitudinal slips can be pushed to extend from the cylinder liner at the same time to stick to the well wall to achieve setting and sealing. This can prevent the guide wedge from sliding down and ensure the smooth completion of window side drilling and its subsequent operations.
[0018] 3. Since the guide rod can achieve both the setting of the guide rod and the contact with the well wall simultaneously through the single-cylinder structure of the setting and anchoring device, it has the advantages of simple structure, easy processing and manufacturing, saving raw materials and low manufacturing cost compared with the existing double-cylinder structure; it is especially suitable for side-drilling wells that do not require the recovery of the guide rod. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the upper part of Embodiment 1 of this utility model.
[0020] Figure 2 This is a schematic diagram of the lower half of Embodiment 2 of this utility model.
[0021] Figure 3 This is a schematic diagram of the upper part of Embodiment 2 of this utility model.
[0022] Figure 4 This is a schematic diagram of the lower half of Embodiment 2 of this utility model.
[0023] Figure 5 yes Figure 2 or Figure 4 AA sectional view.
[0024] In the diagram: 1. Hollow connector; 2. Positioning key; 3. Feeder; 4. Support sleeve; 27. Fastening screw; 6. Guide wedge; 601. Wedge groove; 7. Split retaining ring; 8. Elbow body; 9. Hook body; 10. Limiting screw; 11. Elbow seat; 12. Liquid guide tube; 13. Jet tube; 14. Cylinder liner; 15. Plunger; 151. Limiting groove; 16. Limiting tube; 161. Strip hole; 17. Conical body; 18. Shearing screw; 19. Radial slip; 20. Sealing ball; 21. Ball seat; 22. Support slip; 23. Longitudinal slip. Detailed Implementation
[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0026] Example 1
[0027] like Figure 1 , Figure 2 and Figure 5 As shown, this utility model relates to a hydraulic guide device for wellbore inclination, comprising an infeeder 3, a guide wedge 6, and a setting and anchoring device connected in sequence. A hollow connector 1 is threadedly connected to the upper end of the infeeder 3. A positioning key 2 is fixed radially on the connector 1, protruding from the inner wall of the connector 1 and aligned with the center line of the inclined surface of the guide wedge 6. A fluid guide pipe 12 is provided inside the guide wedge 6, connecting the inner hole of the infeeder 3 and the setting and anchoring device.
[0028] The feeder 3 presses against the inclined surface of the guide wedge 6. A hook body 9 is threadedly connected to the lower end of the feeder 3. An elbow body 8 is inserted into the hook body 9. The upper end of the elbow body 8 passes through the central hole of the hook body 9 and is then sealed and inserted into the central hole of the feeder 3. An annular groove is provided on the upper part of the outer edge of the elbow body 8. A split retaining ring 7 is sleeved in the annular groove between the hook body 9 and the feeder 3 to hold the elbow body 8 in place.
[0029] A bend seat 11 is embedded and welded onto the wedge 6 of the guide tool, corresponding to the bend body 8. The bend seat 11 has an arc-shaped groove, and an integral arc-shaped hook on the hook body 9 is engaged within the arc-shaped groove. This allows the feeder 3 to be disengaged from the guide tool 6 by rotating the drill bit after setting. The lower end of the bend body 8 is inserted into the bend seat 11 and communicates with the fluid guide pipe 12. A limiting screw 10 for connecting the arc-shaped hook is provided radially on the bend seat 11. A support sleeve 4 is fixed to the outer edge of the middle part of the feeder 3. A fastening screw 27 is inserted radially into the wedge 6 of the guide tool, with the front end of the fastening screw 27 threadedly connected to the support sleeve 4 to support the feeder 3.
[0030] A wedge-shaped groove 601 is provided on the lower outer edge of the guide wedge 6. A wedge-shaped support slip 22 is embedded in the wedge-shaped groove 601 and fixed by a shear screw 18. The support slip 22 is aligned with the center line of the inclined surface of the guide wedge 6 and its lower end is inserted into the seat anchoring device.
[0031] The setting and anchoring device includes a cylinder liner 14, the upper end of which is threadedly fixed to the lower end of the guide wedge 6. A conical body 17 and a limiting tube 16 are provided inside the cylinder liner 14. Radial slips 19 are evenly distributed circumferentially along the outer edge of the conical body 17 via shear screws 18. A hollow plunger 15 is provided above the conical body 17 inside the cylinder liner 14. The lower center hole of the plunger 15 is fixedly connected to the upper end of the limiting tube 16 via coarse thread. The supporting slips 22 are embedded in the cylinder liner. The upper end of the cylinder liner 14 is notched and rests against the upper end face of the piston 15. Two wedge-shaped limiting grooves 151 are symmetrically provided on the outer edge of the piston 15. Longitudinal slips 23 are fixed in the limiting grooves by shear screws 18. The two longitudinal slips 23 are located on both sides of the supporting slips 22 and are arranged perpendicular to the supporting slips 22. The longitudinal slips 23 and radial slips 19 are respectively embedded in the windows provided on the cylinder liner 14. A jet tube 13 is inserted between the upper end of the piston 15 and the guide wedge 6.
[0032] The slope ratio of the wedge-shaped groove 601 to the limiting groove 151 is 1.8:1 to 2.0:1, which allows the supporting slip 22 to reach the well wall before the longitudinal slip 23, thereby pushing the guide wedge 6 to the other side of the well wall; the slope of the limiting groove 151 is equal to the taper of the outer edge of the cone 17, which allows the longitudinal slip 23 and the radial slip 19 to reach the well wall simultaneously, achieving setting and sealing;
[0033] The conical body 17 and the limiting tube 16 are connected by a fine-tooth sawtooth thread, with the thread tips on the limiting tube 16 facing downwards. This allows the conical body 17 and the plunger 15 to slide in opposite directions under the pressure of the drilling fluid, thereby pushing the radial slips 19 and the longitudinal slips 23 out of the cylinder liner 14 to achieve setting. Multiple strip-shaped holes are evenly distributed around the circumference of the limiting tube 16, allowing the drilling fluid to enter the cylinder liner 14 and push the conical body 17 and the plunger 15 to slide in opposite directions.
[0034] The upper diameter of the cone 17 is larger than the lower diameter. The upper end of the cone 17 and the outer edge of the plunger 15 are fitted with the inner wall of the cylinder liner 14 through a sliding clearance. O-rings are respectively provided between the outer edges of the opposite ends of the cone 17 and the plunger 15 and the cylinder liner 14. A ball seat 21 is fixed in the central hole at the lower end of the cone 17, and a seat ball 20 is engaged.
[0035] The specific operating steps for performing the task are as follows:
[0036] 1. Connect the guide tool to the drill string via connector 1 and lower it to the predetermined position in the well. For side-drilling wells requiring directional drilling, directly lower the logging tool. Place the logging tool on the positioning key 2 via the keyway of the logging tool guide tool to begin the directional operation. After the guide tool wedge 6 is positioned, remove the logging tool. Connect the angular drill pipe or top drive via the drill string to start the pump for pressurization.
[0037] 2. After the pump is started and pressurized, the high-pressure drilling fluid sequentially passes through the drill string inner bore, hollow joint 1, feeder 3, elbow body 8, guide pipe 12, jet pipe 13, plunger 15, and limit pipe 16 to reach the setting ball 20 inside the ball seat 21 to begin pressurization, filling the drill string with high-pressure drilling fluid. The drilling fluid enters between the conical body 17 and the plunger 15 through the strip-shaped hole 161. The drilling fluid pushes the conical body 17 and the limit pipe 16 to "slip," causing the plunger 15 and the conical body 17 to slide in opposite directions within the cylinder liner 14. When the plunger 15 slides upward, it pushes the support slip 22 to shear the shear screw 18 and squeeze it out into the guide. Between the inclined plate 6 and the well wall; simultaneously, the longitudinal slip 23 is pushed to cut off the shear screw 18 and squeeze it out between the cylinder liner 14 and the well wall; when the conical body 17 slides downward, it pushes the radial slip 19 to cut off the shear screw 18 and squeeze it out between the cylinder liner 14 and the well wall; since the slope ratio of the wedge groove 601 to the limiting groove 151 is 1.8:1 to 2.0:1, the supporting slip 22 can reach the well wall before the longitudinal slip 23, thereby pushing the inclined plate 6 to the other side of the well wall until the radial slip 19 and the longitudinal slip 23 are squeezed out of the cylinder liner 14 and stuck on the well wall to achieve setting.
[0038] 3. After depressurization, rotate the drill string forward. The drill string drives the feeder 3 to rotate, cutting off the fastening screw 27 and the limit screw 10. This causes the arc-shaped hook on the hook body 9 to unscrew from the arc-shaped slot. After rotating 270 degrees, the hook is engaged on the inclined surface of the elbow seat 11, and the lower end of the elbow body 8 is pulled out from the elbow seat 11. Then, the drill string is pulled out, and the connector 1, feeder 3, hook body 9 and elbow body 8 are also brought out from the well. Then, the milling cone is lowered along the inclined surface of the guide wedge 6 to perform window-opening side-drilling operations. After the window is opened, the drill bit is lowered to perform subsequent side-drilling operations.
[0039] Example 2
[0040] like Figures 3-5 As shown, the present invention relates to a hydraulic guide device for well walls, comprising a milling cone 24, a guide wedge 6 and a setting and anchoring device connected in sequence. A positioning key 2 is fixed radially on the milling cone 24. The positioning key 2 protrudes from the inner wall of the milling cone 24 and is aligned with the center line of the inclined surface of the guide wedge 6.
[0041] The milling cone 24 presses against the upper part of the inclined surface of the guide wedge 8. The upper end of the inclined surface of the guide wedge 8 and the positioning key 2 are located on opposite sides of the axis of the milling cone 24. A liquid guide tube 7 is provided inside the guide wedge 8, connecting the inner hole of the milling cone 24 and the inner cavity of the setting and anchoring device. A positioning block 26 is inserted and welded radially into the upper part of the guide wedge 8. The guide wedge 8 is secured in the arc-shaped dovetail groove located at the lower part of the milling cone 24 by the positioning block 26. A fastening screw 27 is radially connected between the positioning block 26 and the milling cone 24. A positioning screw 25 is radially connected between the upper end of the guide wedge 8 and the milling cone 24.
[0042] A secondary water hole is provided radially on the milling cone 24 at the location corresponding to the positioning screw 25. A blind hole communicating with the secondary water hole is provided on the positioning screw 25. When the guide wedge 8 is not disengaged from the milling cone 24, the positioning screw 25 blocks the secondary water hole. When the guide wedge 8 is disengaged from the milling cone 24, that is, after the positioning screw 25 is sheared, the inner hole of the milling cone 24 communicates with the outside through the secondary water hole and the blind hole of the positioning screw 25.
[0043] A milling cone head 28 is threadedly connected to the lower end of the milling cone 24. A nozzle hole communicating with the inner hole of the milling cone 24 is provided on the milling cone head 28. The upper end of the liquid guide tube 7 extends from the upper part of the inclined surface of the guide wedge 8 and is inserted into the nozzle hole. Other structures in this embodiment are the same as in Embodiment 1 and will not be described again.
[0044] The specific operating steps for performing the task are as follows:
[0045] 1. Connect the guide tool to the drill string via the milling cone 24 and lower it to the predetermined position in the well. For side-drilling wells that require directional drilling, directly lower the logging tool. Place the logging tool on the positioning key 2 via the keyway of the logging tool guide tool to begin the directional operation. After the guide tool wedge 6 is positioned, remove the logging tool. Connect the angular drill pipe or top drive via the drill string to start the pump and pressurize.
[0046] 2. After the pump is started and pressurized, the high-pressure drilling fluid passes sequentially through the milling cone 24, the fluid guide pipe 12, the jet pipe 13, the plunger 15, and the limiting pipe 16 to reach the setting ball 20 inside the ball seat 21 to begin pressurization, filling the drill string with high-pressure drilling fluid. The drilling fluid enters between the cone 17 and the plunger 15 through the strip-shaped hole 161. The drilling fluid pushes the cone 17 and the limiting pipe 16 to "slip," causing the plunger 15 and the cone 17 to slide in opposite directions within the cylinder liner 14. When the plunger 15 slides upward, it pushes the support slip 22 to shear the shear screw 18 and squeeze it out between the guide wedge 6 and the well wall. Simultaneously, the longitudinal slip 23 is pushed to cut off the shearing screw and squeeze it between the cylinder liner 14 and the well wall; when the conical body 17 slides downward, it pushes the radial slip 19 to cut off the shearing screw 18 and squeeze it between the cylinder liner 14 and the well wall; since the slope ratio of the wedge groove 601 to the limiting groove 151 is 1.8:1 to 2.0:1, the supporting slip 22 can reach the well wall before the longitudinal slip 23 and the radial slip 19, thereby pushing the guide wedge 6 to the other side of the well wall until the radial slip 19 and the longitudinal slip 23 are squeezed out of the cylinder liner 14 and stuck on the well wall to achieve setting.
[0047] 3. After depressurization, rotate the drill bit forward. The drill bit drives the milling cone 24 to rotate, which will cut off the fastening screw 27 and the positioning screw 25, thereby opening the auxiliary water hole. At the same time, the arc-shaped dovetail groove on the milling cone will disengage from the positioning block 26. Continue to rotate the drill bit, so that the fluid guide tube 12 is broken at the outlet of the milling cone nozzle hole, and the nozzle hole will naturally form the milling cone nozzle. At this time, the guide wedge 6 and the milling cone 24 are completely disengaged, and the pump can be restarted to circulate the drilling fluid. Rotate the drill bit and apply drilling pressure to perform window side drilling.
[0048] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A hydraulic guide tool for wellbore drilling, comprising a guide wedge and a setting and anchoring device sequentially connected below an infeeder or milling cone, wherein wedge-shaped support slips are fixed in a wedge-shaped groove at the lower end of the guide wedge by shear screws, the support slips being aligned with the center line of the inclined surface of the guide wedge, and the setting and anchoring device comprising a conical body and a limiting tube disposed within a cylinder liner, wherein radial slips are evenly distributed along the circumferential direction on the outer edge of the conical body by shear screws; characterized in that: The setting and anchoring device also includes a plunger that is slidably disposed inside the cylinder liner above the cone. The lower end of the plunger is fixedly connected to the upper end of the limiting tube. The supporting slip is embedded in the notch at the upper end of the cylinder liner and abuts against the upper end face of the plunger. Two wedge-shaped limiting grooves are symmetrically provided on the outer edge of the plunger. Longitudinal slips that can extend from the window on the cylinder liner are fixed in the limiting grooves by shear screws. The two longitudinal slips are located on both sides of the supporting slip. A jet tube is connected between the upper end of the plunger and the wedge of the guide.
2. The hydraulic guide device against the well wall according to claim 1, characterized in that: The slope ratio of the wedge-shaped groove to the limiting groove is 1.8:1 to 2.0:1, and the slope of the limiting groove is equal to the taper of the outer edge of the cone.
3. The hydraulic guide device against the well wall according to claim 1, characterized in that: The two longitudinal clamps are arranged perpendicularly to the supporting clamps.
4. The hydraulic guide device against the well wall according to claim 1, characterized in that: The conical body and the limiting tube are connected by a fine-tooth sawtooth thread. The thread tips on the limiting tube face downwards, which allows the conical body and the plunger to slide in opposite directions under the push of the drilling fluid, thereby pushing the radial slips and longitudinal slips out of the cylinder liner to achieve setting.
5. The hydraulic guide vane against the wellbore wall according to any one of claims 1-4, characterized in that: The upper end of the cone and the outer edge of the plunger are fitted with the inner wall of the cylinder liner through a sliding clearance, and O-rings are respectively provided between the outer edges of the opposite ends of the cone and the plunger and the cylinder liner.
6. The hydraulic guide device against the well wall according to claim 5, characterized in that: in The limiting tube has multiple strip holes evenly distributed around its circumference, which allows the drilling fluid entering the cylinder liner to push the cone and plunger to slide in opposite directions.
7. The hydraulic guide vane against the well wall according to claim 1 or 6, characterized in that: A ball seat is provided at the lower end of the cone-shaped body, and a seated ball is engaged.