Hydraulic control steering gear and operation method thereof

Abstract

The invention relates to a hydraulic control steering gear and an operation method thereof. The steering gear comprises an upper connector, a spring barrel, a spring barrel connector, a torque outer barrel, a rotating outer barrel, a conversion connector, a bearing outer barrel, an outer barrel and a lower connector which are sequentially connected. A ball seat is installed in the spring barrel and fixedly connected with a spring mandrel, a spring is installed between the ball seat and the spring barrel connector, and the spring mandrel is sleeved with the spring. The spring mandrel is fixedly connected with the driving shaft, the exterior of the driving shaft is of a gear worm structure, and a limiting cylinder and a torque cylinder are installed in the rotating outer cylinder; the inner surface of the upper section of the torque cylinder is designed into an inner gear structure, and the inner surface of the lower section of the torque cylinder is designed into an inclined triangular inner gear structure; and a gear worm structure outside the driving shaft is matched with an inner gear structure at the upper section of the torque cylinder. The coiled tubing rotating device is reasonable in structural design and convenient to use and operate, solves the problems that an existing coiled tubing cannot rotate in the operation processes of fishing, orientation, well drilling and the like, and cannot adjust the angle of a fishing tool or other downhole operation tools, and is wide in applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole tools in the oil and gas industry, and more specifically to a hydraulically controlled steering device and an operating method thereof. Background Art

[0002] As shale gas is buried deeper, the wellbore trajectory becomes more complex, the downhole pressure gradually increases, and the working conditions of the entire fracturing and gas testing stage become more complicated. During this period, various forms of construction will be carried out, such as pumping bridge plug segmented fracturing, continuous tubing drilling bridge plug, and pressure-operated machine production string. During the construction process, there may be a variety of complex situations where downhole objects occur, such as the bridge plug pump falling off the well, the drilling plug tool breaking off, the continuous tubing breaking, and the tubing fatigue breaking. In order to salvage the downhole objects, the continuous tubing pressure salvage operation method is generally used. This method can use the continuous tubing's own blowout preventer, blowout preventer, blowout preventer box and other combinations to achieve dynamic sealing, control the pressure in the well, and complete the salvage of downhole objects under pressure conditions. It will not cause reservoir damage due to well pressure. It is a common method for shale gas wells to deal with complex downhole objects. However, the coiled tubing is a continuous thin-walled welded pipe. The pipe body itself cannot rotate, and the salvage barrel connected to the coiled tubing cannot rotate at a low speed, making it difficult for fallen objects in the well to enter the salvage barrel, resulting in a low success rate for salvage. This is the main reason why the salvage effect of the coiled tubing is unfavorable compared to the salvage operation of the workover rig. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulically controlled steering device and an operating method thereof, which can realize that the continuous oil pipe drives the overshot tube to rotate at a low speed, move the fallen objects in the well so that they can enter the overshot tube smoothly, and improve the success rate of salvage.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct a hydraulic control steering gear, including an upper joint, a spring cylinder, a spring cylinder joint, a torque outer cylinder, a rotating outer cylinder, a conversion joint, a bearing outer cylinder, an outer cylinder and a lower joint connected in sequence from top to bottom;

[0005] A nozzle is fixed in the lower joint, a ball seat is installed in the spring cylinder, the ball seat is fixedly connected to the spring core shaft, a spring is installed between the ball seat and the spring cylinder joint, and the spring is sleeved outside the spring core shaft; the spring core shaft is fixedly connected to the drive shaft, the outside of the drive shaft is a gear worm structure, and a limit cylinder and a torque cylinder are installed inside the rotating outer cylinder; the inner surface of the upper section of the torque cylinder is designed as an internal gear structure, and the inner surface of the lower section of the torque cylinder is designed as an oblique triangle internal gear structure; the gear worm structure outside the drive shaft cooperates with the internal gear structure of the upper section of the torque cylinder;

[0006] The driving shaft is also connected to the ratchet mandrel, the ratchet mandrel is fixedly connected to the ratchet joint, and a ratchet baffle and a ratchet spring are installed between the flower-shaped structure of the ratchet mandrel and the oblique triangular internal gear structure of the torque cylinder;

[0007] The ratchet joint is fixedly connected to the bearing core shaft, the bearing core shaft is fixedly connected to the rotating core shaft, and the rotating core shaft is fixedly connected to the lower joint.

[0008] In the above scheme, a convex key is provided on the outer surface of the bearing core shaft, and a convex key is provided on the inner surface of the bearing outer cylinder. A one-way bearing is installed between the convex key of the bearing core shaft and the convex key of the bearing outer cylinder, and both ends of the one-way bearing are tightly attached to the ratchet joint and the rotating core shaft.

[0009] In the above scheme, a one-way thrust ball bearing is installed between the rotating core shaft and the bearing outer cylinder, and both ends of the one-way thrust ball bearing are closely attached to the rotating core shaft and the outer cylinder.

[0010] In the above scheme, a one-way thrust ball bearing is installed between the rotating core shaft and the outer cylinder, and both ends of the one-way thrust ball bearing are closely attached to the outer cylinder and the lower joint.

[0011] In the above solution, a grease injection hole is provided on the wall of the torque outer cylinder.

[0012] In the above solution, an elastic retaining ring is installed on the ratchet core shaft to prevent the ratchet baffle and the ratchet spring from escaping from the flower-shaped structure.

[0013] In the above scheme, the lower joint of the spring core shaft is an external hexagonal structure, the interior of the torque outer cylinder is an internal hexagonal structure, and the spring core shaft moves along the axis in the torque outer cylinder.

[0014] In the above solution, the ball seat is provided with an inner hexagonal groove.

[0015] The present invention also provides an operating method of a hydraulically controlled steering gear, comprising the following steps:

[0016] S1. When the downhole tool needs to be rotated, liquid is pumped into the pipe string. When the liquid passes through the nozzle at high speed, throttling is formed to generate flow pressure;

[0017] S2, the flow pressure acts on the ball seat, causing the ball seat to move rightward, compressing the spring, driving the spring core shaft and the drive shaft to move rightward accordingly, causing the torque cylinder to rotate clockwise, and through the ratchet baffle, pushing the ratchet core shaft to rotate clockwise accordingly, driving the ratchet joint, the bearing core shaft, the rotating core shaft, and the lower joint to rotate clockwise accordingly. When the ball seat moves to the right to the maximum position, the lower joint rotates clockwise to the maximum angle, and the fishing tool connected to the lower joint also rotates clockwise to the maximum angle accordingly;

[0018] S3, stop pumping liquid into the pipe column, the ball seat moves leftward under the restoring force of the spring, driving the spring mandrel and the drive shaft to move leftward accordingly, so that the torque cylinder rotates counterclockwise, and since the oblique triangular internal gear structure will not push the ratchet baffle, the ratchet mandrel will not rotate accordingly; the ratchet mandrel, ratchet joint, bearing mandrel, rotating mandrel and lower joint will not rotate counterclockwise, and the salvage tool connected to the lower joint will not rotate counterclockwise;

[0019] S4. Repeating steps S1-S3 can make the salvage tool connected to the lower joint rotate continuously clockwise, and by counting the number of rotations, the total clockwise rotation angle of the salvage tool is calculated.

[0020] The hydraulic control steering gear and the operating method thereof of the present invention have the following beneficial effects:

[0021] 1. The present invention can rotate the fishing tool or other downhole operation tools at any number of times and any angle, and the rotation angle is controllable, which is conducive to the refinement of downhole operation;

[0022] 2. The present invention can withstand a certain amount of reverse torque, and can ensure that the fishing tool or other downhole operation tools will not rotate unexpectedly; the present invention can achieve rotation only by pumping liquid, without additional action or energy, and has strong operability;

[0023] 3. The present invention has a reasonable structural design and is easy to use and operate. It solves the problem that the existing continuous oil pipe cannot rotate during operations such as salvage, orientation, and drilling, and cannot adjust the angle of the salvage tool or other downhole operating tools. It has a wide range of applicability and makes a great contribution to the expansion of the business scope of continuous oil pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0025] Figure 1 It is a structural schematic diagram of the hydraulic control steering gear of the present invention;

[0026] Figure 2 yes Figure 1 AA section view in;

[0027] Figure 3 It is a schematic diagram of the structure of the tee;

[0028] Figure 4 yes Figure 3 Side view of

[0029] Figure 5 It is a schematic diagram of the structure of the torque cylinder;

[0030] Figure 6 yes Figure 5 AA section view in;

[0031] Figure 7 It is a schematic diagram of the structure of the drive shaft;

[0032] Figure 8 yes Figure 7 AA section view in;

[0033] Fig. 9 It is a schematic diagram of the structure of the torque cylinder;

[0034] Fig.10 yes Fig. 9 AA section view in;

[0035] Fig.11 yes Fig.10 The enlarged view of point 1 in the figure;

[0036] Fig.12 yes Fig. 9 BB section view in;

[0037] Fig.13 It is a schematic diagram of the structure of the ratchet mandrel;

[0038] Fig.14 yes Fig.13 AA section view in;

[0039] Fig.15 It is a schematic diagram of the structure of the bearing mandrel;

[0040] Fig.16 yes Fig.15 AA section view in;

[0041] Fig.17 It is a schematic diagram of the structure of the rotating mandrel;

[0042] Fig.18 yes Fig.17 AA section view in;

[0043] In the figure: 1-upper joint, 2-ball seat, 3-spring cylinder, 4-spring cylinder joint, 5-spring core shaft, 6-torque outer cylinder, 7-rotating outer cylinder, 8-torque cylinder, 9-limit cylinder, 10-ratchet baffle, 11-drive shaft, 12-conversion joint, 13-ratchet core shaft, 14-ratchet joint, 15-bearing outer cylinder, 16-bearing core shaft, 17-rotating core shaft, 18-outer cylinder, 19-lower joint, 20-nozzle, 21-spring, 22-ratchet spring, 23-27-support seal, 28-36-O-ring, 37-one-way bearing, 38-one-way thrust ball bearing, 39-set screw, 40-elastic retaining ring, 41-plug. DETAILED DESCRIPTION

[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0045] like Figure 1 As shown, a hydraulic control steering gear provided by the present invention includes: an upper joint 1, a ball seat 2, a spring cylinder 3, a spring cylinder joint 4, a spring core shaft 5, a torque outer cylinder 6, a rotating outer cylinder 7, a torque cylinder 8, a limit cylinder, a ratchet baffle 10, a drive shaft 11, a conversion joint 12, a ratchet core shaft 13, a ratchet joint 14, a bearing outer cylinder 15, a bearing core shaft 16, a rotating core shaft 17, an outer cylinder 18, a lower joint 19, a nozzle 20, a spring 21, a ratchet spring 22, a one-way bearing 37, a one-way thrust ball bearing 38, a set screw 39, an elastic retaining ring 40 and a plug 41.

[0046] The upper joint 1 is fixedly connected to the spring cylinder 3 by threads, and an O-ring is installed at the connection. The spring cylinder 3 is fixedly connected to the spring cylinder joint 4 by threads, and an O-ring is installed at the connection. The spring cylinder joint 4 is fixedly connected to the torque outer cylinder 6 by threads, and an O-ring is installed at the connection. The torque outer cylinder 6 is fixedly connected to the rotating outer cylinder 7 by threads, and an O-ring is installed at the connection. The rotating outer cylinder 7 is fixedly connected to the conversion joint 12 by threads, and an O-ring is installed at the connection. The conversion joint 12 is fixedly connected to the bearing outer cylinder 15 by threads, and an O-ring is installed at the connection. The bearing outer cylinder 15 is fixedly connected to the outer cylinder 18 by threads, and an O-ring is installed at the connection. A support seal and an O-ring are installed between the outer cylinder 18 and the lower joint 19.

[0047] The nozzle 20 is fixed in the lower joint 19 by threads. A support seal and an O-ring are installed between the outer tube 18 and the lower joint 19. The ball seat 2 is fixedly connected to the spring core shaft 5 by threads, and an O-ring is installed at the connection. The ball seat 2 is installed in the spring tube 3, and a support seal and an O-ring are installed between the ball seat 2 and the spring tube 3. The spring 21 is installed between the ball seat 2 and the spring tube joint 4, and is sleeved outside the spring core shaft 5. The spring 21 is compressed when the ball seat 2 is pushed by the liquid pressure, and pushes the ball seat 2 back to its original position after the liquid pressure disappears. A support seal and an O-ring are installed between the spring core shaft 5 and the spring tube joint 4.

[0048] The spring mandrel 5 is fixedly connected to the drive shaft 11 through a thread, and an O-ring is installed at the connection. The limit cylinder 9, the torque cylinder 8, and the one-way thrust ball bearing 38 are installed in the rotating outer cylinder 7, and a support seal is installed between the torque cylinder 8 and the rotating outer cylinder 7. This installation method prevents the torque cylinder 8 from axially moving in the rotating outer cylinder 7, but allows rotational movement.

[0049] The ratchet mandrel 13 is fixedly connected to the ratchet joint 14 through a thread, and an O-ring is installed at the connection. A support seal and an O-ring are installed between the ratchet mandrel 13 and the drive shaft 11. Two elastic retaining rings 40 are installed on the ratchet mandrel 13, and the function of the elastic retaining ring 40 is to prevent the ratchet baffle 10 and the ratchet spring 22 from falling out of the flower-shaped structure.

[0050] The ratchet joint 14 is fixedly connected to the bearing mandrel 16 by a thread, and an O-ring is installed at the connection. The bearing mandrel 16 is fixedly connected to the rotating mandrel 17 by a thread, and an O-ring is installed at the connection. The rotating mandrel 17 is fixedly connected to the lower joint 19 by a thread, and an O-ring and a set screw 39 are installed at the connection.

[0051] A grease injection hole is processed on the wall of the torque outer cylinder 6, and grease is injected into the inner cavity through the grease injection hole to ensure flexible movement of the entire internal system of the tool. After the grease is filled, the grease injection hole is closed with a plug 41 to prevent water from entering.

[0052] like Figure 3-4 As shown, the ball seat 2 is designed with an inner hexagonal groove for easy installation.

[0053] like Figure 5-6 As shown, the interior of the torque outer cylinder 6 is designed as an inner hexagonal structure, and the exterior of the lower joint of the spring core shaft 5 is designed as an outer hexagonal structure. The spring core shaft 5 moves along the axis in the torque outer cylinder 6. Due to the constraint of the hexagonal structure, the spring core shaft 5 and the torque outer cylinder 6 cannot rotate relative to each other.

[0054] like Figure 7-8 As shown, the exterior of the drive shaft 11 is designed as a gear worm structure; Figure 6As shown, the upper inner surface of the torque cylinder 8 is designed as an internal gear structure, and the lower inner surface of the torque cylinder 8 is designed as an oblique triangle internal gear structure. The external gear worm structure of the drive shaft 11 cooperates with the upper inner gear structure of the torque cylinder 8. When the drive shaft 11 moves to the right along the axis, the torque cylinder 8 rotates clockwise, and when the drive shaft 11 moves to the left along the axis, the torque cylinder 8 rotates counterclockwise. By adjusting the design parameters of the internal gear structure, the maximum rotation angle can be changed.

[0055] like Figure 2-Figure 14 As shown, the middle part of the ratchet mandrel 13 is designed as a flower-shaped structure, and a ratchet baffle 10 and a ratchet spring 22 are installed between the flower-shaped structure of the ratchet mandrel 13 and the oblique triangular internal gear structure of the torque cylinder 8. When the torque cylinder 8 rotates clockwise, the oblique triangular internal gear structure pushes the ratchet baffle 10, and the ratchet mandrel 13 rotates clockwise accordingly; when the torque cylinder 8 rotates counterclockwise, the oblique triangular internal gear structure will not push the ratchet baffle 10, and the ratchet mandrel 13 will not rotate.

[0056] like Figure 15-16 As shown, the outer surface of the bearing core shaft 16 is designed with a convex key; Figure 17-18 As shown, the inner surface of the bearing outer cylinder 15 is designed with a convex key. A set of one-way bearings 37 are installed between the convex key of the bearing core shaft 16 and the convex key of the bearing outer cylinder 15, and are tightly pressed by the ratchet joint 14 and the two ends of the rotating core shaft 17. The one-way bearing 37 is a common bearing on the market that can only rotate in one direction and lock in the opposite direction. The number of one-way bearings 37 installed is determined according to the torque that the hydraulic control steering gear needs to withstand. A set of one-way thrust ball bearings 38 are installed between the rotating core shaft 17 and the bearing outer cylinder 15, and are tightly pressed by the two ends of the rotating core shaft 17 and the outer cylinder 18. Another set of one-way thrust ball bearings 38 are installed between the rotating core shaft 17 and the outer cylinder 18, and are tightly pressed by the two ends of the outer cylinder 18 and the lower joint 19. The function of the two sets of one-way thrust ball bearings 38 is to prevent the rotating core shaft 17 and the lower joint 19 from being affected by tension or pressure, which causes the rotation of the rotating core shaft 17 and the lower joint 19 to be inflexible.

[0057] The present invention also provides an operating method of a hydraulically controlled steering gear, the specific steps of which are as follows:

[0058] S1. When the downhole tool needs to be rotated, liquid is pumped into the pipe string. When the liquid passes through the nozzle 20 at high speed, throttling is formed to generate flow pressure.

[0059] S2, the flow pressure acts on the ball seat 2, causing the ball seat 2 to move rightward, compressing the spring 21, driving the spring core shaft 5 and the drive shaft 11 to move rightward accordingly, causing the torque cylinder 8 to rotate clockwise, and through the ratchet baffle 10, pushing the ratchet core shaft 13 to rotate clockwise accordingly, driving the ratchet joint 14 and the bearing core shaft 16, the rotating core shaft 17, and the lower joint 19 to rotate clockwise accordingly. When the ball seat 2 moves to the right to the maximum position, the lower joint 19 rotates clockwise to the maximum angle, and the salvage tool connected to the lower joint 19 also rotates clockwise to the maximum angle accordingly;

[0060] S3, stop pumping liquid into the pipe column, the ball seat 2 moves to the left under the restoring force of the spring 21, driving the spring mandrel 5 and the drive shaft 11 to move to the left, so that the torque cylinder 8 rotates counterclockwise, and the ratchet baffle 10 will not be pushed by the oblique triangle internal gear structure, and the ratchet mandrel 13 will not rotate accordingly; at the same time, due to the effect of the one-way bearing 37, the ratchet mandrel 13 and the ratchet joint 14, the bearing mandrel 16, the rotating mandrel 17, and the lower joint 19 will not rotate counterclockwise, and the salvage tool connected to the lower joint 19 will not rotate counterclockwise;

[0061] S4. Repeating steps S1-S3 can make the salvage tool connected to the lower connector 19 rotate continuously clockwise. By counting the number of rotations, the total clockwise rotation angle of the salvage tool can be calculated.

[0062] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A hydraulically controlled steering gear, characterized in that: It comprises an upper joint (1), a spring cylinder (3), a spring cylinder joint (4), a torque outer cylinder (6), a rotating outer cylinder (7), a conversion joint (12), a bearing outer cylinder (15), an outer cylinder (18) and a lower joint (19) which are connected in sequence from top to bottom; A nozzle 20 is fixed inside the lower joint (19); a ball seat (2) is installed inside the spring cylinder (3); the ball seat (2) is fixedly connected to the spring core shaft (5); a spring (21) is installed between the ball seat (2) and the spring cylinder joint (4); the spring (21) is sleeved outside the spring core shaft (5); the spring core shaft (5) is fixedly connected to the drive shaft (11); the outside of the drive shaft (11) is a gear worm structure; a limit cylinder (9) and a torque cylinder (8) are installed inside the rotating outer cylinder (7); the inner surface of the upper section of the torque cylinder (8) is designed as an internal gear structure, and the inner surface of the lower section of the torque cylinder (8) is designed as an oblique triangle internal gear structure; the gear worm structure outside the drive shaft (11) and the upper section internal gear structure of the torque cylinder (8) cooperate with each other; The driving shaft (11) is also connected to a ratchet core shaft (13), and the ratchet core shaft (13) is fixedly connected to a ratchet joint (14). A ratchet baffle (10) and a ratchet spring (22) are installed between the flower-shaped structure of the ratchet core shaft (13) and the oblique triangular internal gear structure of the torque cylinder (8); The ratchet joint (14) is fixedly connected to the bearing core shaft (16), the bearing core shaft (16) is fixedly connected to the rotating core shaft (17), and the rotating core shaft (17) is fixedly connected to the lower joint (19).

2. The hydraulically controlled steering gear according to claim 1, characterized in that: The outer surface of the bearing core shaft (16) is provided with a convex key, and the inner surface of the bearing outer cylinder (15) is provided with a convex key. A one-way bearing (37) is installed between the convex key of the bearing core shaft (16) and the convex key of the bearing outer cylinder (15), and both ends of the one-way bearing (37) are tightly attached to the ratchet joint (14) and the rotating core shaft (17).

3. The hydraulically controlled steering gear according to claim 1, characterized in that: A one-way thrust ball bearing (38) is installed between the rotating core shaft (17) and the bearing outer cylinder (15), and both ends of the one-way thrust ball bearing (38) are closely attached to the rotating core shaft (17) and the outer cylinder (18).

4. The hydraulically controlled steering gear according to claim 1, characterized in that: A one-way thrust ball bearing (38) is installed between the rotating core shaft (17) and the outer cylinder (18), and both ends of the one-way thrust ball bearing (38) are closely attached to the outer cylinder (18) and the lower joint (19).

5. The hydraulically controlled steering gear according to claim 1, characterized in that: The wall of the torque outer cylinder (6) is provided with a grease injection hole.

6. The hydraulically controlled steering gear according to claim 1, characterized in that: An elastic retaining ring (40) for preventing the ratchet baffle (10) and the ratchet spring (22) from falling out of the flower-shaped structure is installed on the ratchet core shaft (13).

7. The hydraulically controlled steering gear according to claim 1, characterized in that: The lower joint of the spring core shaft (5) is an external hexagonal structure, the interior of the torque outer cylinder (6) is an internal hexagonal structure, and the spring core shaft (5) moves along the axis in the torque outer cylinder (6).

8. The hydraulically controlled steering gear according to claim 1, characterized in that: The ball seat (2) is provided with an inner hexagonal groove.

9. An operating method of a hydraulically controlled steering gear according to claim 1, characterized in that: The following steps are involved: S1. When the downhole tool needs to be rotated, liquid is pumped into the pipe string. When the liquid passes through the nozzle 20 at high speed, throttling is formed to generate flow pressure; S2, the flow pressure acts on the ball seat (2), causing the ball seat (2) to move rightward, compressing the spring (21), driving the spring core shaft (5) and the drive shaft (11) to move rightward accordingly, causing the torque cylinder (8) to rotate clockwise, and through the ratchet baffle (10), pushing the ratchet core shaft (13) to rotate clockwise accordingly, driving the ratchet joint (14) and the bearing core shaft (16), the rotating core shaft (17), and the lower joint (19) to rotate clockwise accordingly. When the ball seat (2) moves rightward to the maximum position, the lower joint (19) rotates clockwise to the maximum angle, and the fishing tool connected to the lower joint (19) also rotates clockwise to the maximum angle; S3, stop pumping liquid into the pipe column, the ball seat (2) moves leftward under the restoring force of the spring (21), driving the spring core shaft (5) and the drive shaft (11) to move leftward accordingly, causing the torque cylinder (8) to rotate counterclockwise. Since the oblique triangular internal gear structure will not push the ratchet baffle (10), the ratchet core shaft (13) will not rotate accordingly; the ratchet core shaft (13), the ratchet joint (14), the bearing core shaft (16), the rotating core shaft (17) and the lower joint (19) will not rotate counterclockwise, and the salvage tool connected to the lower joint (19) will not rotate counterclockwise; S4. Repeating steps S1-S3 can make the salvage tool connected to the lower joint (19) rotate continuously clockwise. By counting the number of rotations, the total clockwise rotation angle of the salvage tool is calculated.

Images