A downhole tool with a high-temperature triggered sliding sleeve

Abstract

The present invention belongs to the technical field of downhole tools, and specifically relates to a downhole tool with a high-temperature trigger type sliding sleeve, including a sliding sleeve body. On the left and right sides below the sliding sleeve body, there are fixedly connected guiding plates. An opening is provided on the surface of the sliding sleeve body, and a baffle is slidably installed inside the opening. A pressing block penetrates through the top of the baffle, and a shape memory alloy spring is fixedly connected to the end of the pressing block. The end of the shape memory alloy spring is connected to a heat conducting plate, and the heat conducting plate is fixedly connected to the sliding sleeve body. A first piston is slidably installed inside the sliding sleeve body above the heat conducting plate, and a second piston is slidably installed inside the sliding sleeve body on the left side of the first piston. The front end of the second piston is fixedly connected to a conductive contact piece, and a battery is installed in the upper left of the conductive contact piece, and an electric heating wire is arranged below the battery. This device has the function of completely opening the opening by high-temperature triggering, and can conveniently dock two adjacent sliding sleeves, and has a guiding function during docking.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole tools, and particularly to a downhole tool with a high-temperature triggered sliding sleeve. Background Art

[0002] Downhole tools refer to the tools used in the process of oil well petroleum exploitation. The downhole sliding sleeve tool is one of them. The sliding sleeve acts as a connecting piece to connect the oil well. There are still some defects in the existing downhole sliding sleeve tools during use;

[0003] The existing sliding sleeve cannot adjust its own opening method as needed and cannot automatically maintain a fully open state when the pressure is too high. The existing pressure valve usually opens automatically after the pressure is too high, but will close again after the pressure returns to the normal value and cannot automatically maintain an open state when the pressure reaches a certain value, which affects the use efficiency of downhole tools. Moreover, the existing sliding sleeve type downhole tools usually adopt butt joint methods such as threaded butt joint or snap connection. Although the two connection methods can achieve the butt joint function, when the threaded connection is rotated in the reverse direction later, it is easy to cause the sliding sleeve to fall off, and the stability is poor. In addition, the butt joint steps of the snap connection method are relatively cumbersome, and the existing sliding sleeve does not have a guiding function during downhole butt joint. Summary of the Invention

[0004] In view of the problems existing in the existing downhole tools, the present invention is proposed.

[0005] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided: A downhole tool with a high-temperature triggered sliding sleeve, including a sliding sleeve body. On the left and right sides below the sliding sleeve body, there are fixedly connected guiding plates. An opening is provided on the surface of the sliding sleeve body, and a baffle is slidably installed inside the opening. A pressing block penetrates through the top of the baffle, and a shape memory alloy spring is fixedly connected to the end of the pressing block. The end of the shape memory alloy spring is connected to a heat conducting plate, and the heat conducting plate is fixedly connected to the sliding sleeve body. A first piston is slidably installed inside the sliding sleeve body above the heat conducting plate, and a second piston is slidably installed inside the sliding sleeve body on the left side of the first piston. The front end of the second piston is fixedly connected to a conductive contact piece. A battery is installed above the left of the conductive contact piece, and an electric heating wire is provided below the battery. The baffle is connected to the sliding sleeve body through a first spring. A pressure ring is slidably installed inside the sliding sleeve body. A connecting plate is fixedly connected below the pressure ring. A first rotating plate is rotatably installed on the left side below the connecting plate, and a second rotating plate is rotatably installed on the right side below the connecting plate. Tooth grooves are provided inside the sliding sleeve body above.

[0006] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: the guide plates are symmetrically distributed on the left and right sides of the sleeve body, the guide plates are inclined, and the outer wall of the lower half of the sleeve body is in mutual contact with the inner wall of the upper half of the adjacent sleeve body.

[0007] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: the baffle is slidably connected to the sleeve body, a heat insulation plate is arranged at the lower right of the baffle, the material of the heat insulation plate is aerogel, and the positions of the heat insulation plate and the first spring correspond to each other.

[0008] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: the central axes of the first piston, the second piston and the conductive contact piece are collinear, inclined planes are arranged on both the upper and lower sides of the left half of the conductive contact piece, the positions of the wires below the battery and above the electric heating wire correspond to the position of the conductive contact piece, and the conductive contact piece and the sleeve body form a first sliding structure through the first piston and the second piston.

[0009] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: the pressing block and the baffle form a second sliding structure through the electric heating wire, the heat conducting plate and the shape memory alloy spring, and the pressing blocks are equally spaced on the baffle.

[0010] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: a connecting shaft is fixedly connected to the front end of the bottom of the connecting plate, the pressing ring, the connecting plate and the connecting shaft are integrally formed, a tightening rope is bolted to the lower side of the right side of the pressing ring, a towing steel rope is bolted to the upper side of the right side of the pressing ring, a motor is fixedly connected to the upper right of the sleeve body, the output shaft of the motor is connected with the towing steel rope, and a fixed shaft is fixedly installed at the lower right of the sleeve body, and the fixed shaft and the tightening rope are fixedly connected.

[0011] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: the first rotating plate and the second rotating plate are both connected to the connecting shaft through scroll springs, and the connection mode between the first rotating plate and the second rotating plate is a rotational connection.

[0012] As a preferred embodiment of the downhole tool with a high-temperature trigger sleeve according to the present invention, wherein: the scroll springs on the first rotating plate and the second rotating plate have opposite winding directions, and the first rotating plate and the second rotating plate and the sleeve body and the tooth groove form a pressing structure through the scroll springs.

[0013] As a preferred embodiment of the downhole tool with a high-temperature trigger sliding sleeve according to the present invention, the tooth grooves are equally angularly distributed inside the upper half of the sliding sleeve body, and the positions of the first rotating plate and the second rotating plate correspond to the positions of the tooth grooves.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. By setting the motor box to tow the steel wire, the device can adjust the initial position of the pressing ring. When it is necessary to dock two adjacent sliding sleeve bodies, two vortex springs with opposite directions can be used to make the first rotating plate and the second rotating plate tighten the inner wall of the tooth groove, so that the device can conveniently dock two adjacent sliding sleeve bodies. During the docking process, the two guiding plates at the end of the sliding sleeve body can guide the sliding sleeve, so that even if there is a small error in the downhole docking of the device, the error can be compensated, improving the use effect of the device. Compared with the conventional snap docking and screw docking, the docking of this device is more convenient.

[0016] 2. Through the conductive contact piece, battery and electric heating wire on the device, in cooperation with the heat conducting plate, shape memory alloy spring and pressing block, when the device is under pressure, the conductive contact piece can connect the battery and the electric heating wire to realize the heating function, so that the shape memory alloy spring automatically shortens, or the shape memory alloy spring automatically shortens at high temperature, and then through the first spring, the baffle automatically moves downward to open the opening, realizing the function of the automatic connecting pipe, so that the device can automatically remain in the open state after the pressure reaches a certain value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the drawings and specific embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0018] Figure 1 is a schematic diagram of the overall structure of the downhole tool with a high-temperature trigger sliding sleeve according to the present invention;

[0019] Figure 2 is a schematic diagram of the connection structure of two adjacent sliding sleeve bodies of the present invention;

[0020] Figure 3 is Figure 2 a schematic diagram of the structure at position A in

[0021] Figure 4 is Figure 2 a schematic diagram of the structure at position B in

[0022] Figure 5It is a schematic front sectional view of the sliding sleeve body of the present invention;

[0023] Figure 6 is Figure 5 a schematic view of the structure at position C in

[0024] Figure 7 is Figure 5 a schematic view of the structure at position D in

[0025] Figure 8 It is a schematic view of the connection structure between the connecting shaft and the first rotating plate of the present invention.

[0026] Reference numerals in the figure: 1, sliding sleeve body; 2, guide plate; 3, opening; 4, baffle; 5, first spring; 6, heat insulation plate; 7, first piston; 8, second piston; 9, conductive contact; 10, battery; 11, electric heating wire; 12, heat conducting plate; 13, shape memory alloy spring; 14, pressing block; 15, pressing ring; 16, connecting plate; 17, towing steel rope; 18, motor; 19, fixed shaft; 20, slack rope; 21, connecting shaft; 22, first rotating plate; 23, second rotating plate; 24, tooth groove; 25, scroll spring. Detailed implementation manners

[0027] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a thorough understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation manners disclosed below.

[0029] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the implementation manners of the present invention, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general ratio, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0030] Embodiment

[0031] To make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation manners of the present invention in conjunction with the accompanying drawings in detail.

[0032] Such as Figures 1-8As shown in the figure, a downhole tool with a high-temperature trigger sleeve includes a sleeve body 1. On the left and right sides below the sleeve body 1, there are fixedly connected guide plates 2. An opening 3 is provided on the surface of the sleeve body 1. Inside the opening 3, there is a sliding baffle 4. A pressure block 14 penetrates through the top of the baffle 4. The end of the pressure block 14 is fixedly connected to a shape memory alloy spring 13. The end of the shape memory alloy spring 13 is connected to a heat conducting plate 12. The heat conducting plate 12 is fixedly connected to the sleeve body 1. Inside the sleeve body 1 above the heat conducting plate 12, there is a sliding first piston 7. Inside the sleeve body 1 on the left side of the first piston 7, there is a sliding second piston 8. The front end of the second piston 8 is fixedly connected to a conductive contact 9. Above the left upper part of the conductive contact 9, there is a battery 10. Below the battery 10, there is an electric heating wire 11. The baffle 4 is connected to the sleeve body 1 through a first spring 5. Inside the sleeve body 1, there is a sliding pressure ring 15. When the device encounters high temperature or excessive pressure, the second piston 8 and the first piston 7 make the conductive contact 9 connect the electric heating wire 11 and the battery 10, so that the electric heating wire 11 automatically heats up. In actual use, a low-voltage battery 10 needs to be used to avoid the electric heating wire 11 from getting too hot. The electric heating wire 11 heats the shape memory alloy spring 13, so that the baffle 4 is no longer clamped by the pressure block 14. At this time, the first spring 5 makes the baffle 4 automatically move downward, thus opening the opening 3. Below the pressure ring 15, there is a connecting plate 16. On the left side below the connecting plate 16, there is a rotatably installed first rotating plate 22. On the right side below the connecting plate 16, there is a rotatably installed second rotating plate 23. Inside the upper part of the sleeve body 1, there is a tooth groove 24. Through the tooth groove 24 on the device cooperating with the first rotating plate 22 and the second rotating plate 23, the first rotating plate 22 and the second rotating plate 23 can abut against the inner wall of the tooth groove 24, so that the device can stably dock two adjacent sleeve bodies 1, improving the convenience of the device during use.

[0033] In this example, the guide plates 2 are symmetrically distributed on the left and right sides of the sleeve body 1. The guide plates 2 are inclined. The outer wall of the lower half of the sleeve body 1 fits with the inner wall of the upper half of the adjacent sleeve body 1, so that the two adjacent sleeve bodies 1 maintain an overall sealing effect after docking, improving the stability of the device during operation.

[0034] In this example, the baffle 4 is slidably connected to the sleeve body 1. An insulating plate 6 is provided at the lower right of the baffle 4. The material of the insulating plate 6 is aerogel. The positions of the insulating plate 6 and the first spring 5 correspond to each other. Through the insulating plate 6 on the device, before the baffle 4 is triggered to move forward abnormally, the adverse effect of high temperature on the first spring 5 is reduced as much as possible, so that the first spring 5 can work normally.

[0035] In this example, the central axes of the first piston 7, the second piston 8, and the conductive contact piece 9 are collinear. Oblique cutting surfaces are provided on both the upper and lower sides of the left half of the conductive contact piece 9. The positions of the wires below the battery 10 and above the electric heating wire 11 correspond to the position of the conductive contact piece 9. The conductive contact piece 9 forms a first sliding structure with the sliding sleeve body 1 through the first piston 7 and the second piston 8. Through the first sliding structure on the device, when the external pressure of the device is too high, the first piston 7 and the second piston 8 automatically move to the left, thereby driving the conductive contact piece 9 to move to the left, so that the conductive contact piece 9 contacts the battery 10, in order to realize the trigger heating function subsequently.

[0036] In this example, the pressing block 14 forms a second sliding structure with the baffle 4 through the electric heating wire 11, the heat conducting plate 12, and the shape memory alloy spring 13. The pressing blocks 14 are evenly distributed on the baffle 4. When the shape memory alloy spring 13 on the device is heated and shrinks, the pressing block 14 can slide to the right after being heated, so that the pressing block 14 disengages from the clamping engagement with the baffle 4, enabling the baffle 4 to be automatically opened under high temperature and high pressure environments.

[0037] In this example, a connecting shaft 21 is fixedly connected to the front end of the bottom of the connecting plate 16. The pressing ring 15, the connecting plate 16, and the connecting shaft 21 are integrally formed. A tightening rope 20 is bolted to the lower side of the right side of the pressing ring 15, and a traction steel rope 17 is bolted to the upper side of the right side of the pressing ring 15. A motor 18 is fixedly connected to the upper right of the sliding sleeve body 1, and the traction steel rope 17 is connected to the output shaft of the motor 18. A fixed shaft 19 is fixedly installed on the lower right of the sliding sleeve body 1, and the fixed shaft 19 and the tightening rope 20 are fixedly connected. Through the fixed shaft 19 and the tightening rope 20 on the device, the pressing ring 15 is always kept in a state of being pulled down, so that two adjacent sliding sleeve bodies 1 can be stably butted. Subsequently, the motor 18 can wind the traction steel rope 17, enabling two adjacent sliding sleeve bodies 1 to be disengaged, which is convenient for adjusting the number of sliding sleeve bodies 1 installed.

[0038] In this example, both the first rotating plate 22 and the second rotating plate 23 are connected to the connecting shaft 21 through scroll springs 25. The connection mode between the first rotating plate 22 and the second rotating plate 23 is a rotational connection. The scroll springs 25 enable the first rotating plate 22 and the second rotating plate 23 on the device to tighten against the inner wall of the sliding sleeve, ensuring the stability during the docking of the sliding sleeves.

[0039] In this example, the scroll springs 25 on the first rotating plate 22 and the scroll springs 25 on the second rotating plate 23 have opposite winding directions. The first rotating plate 22 and the second rotating plate 23 form a pressing structure with the sliding sleeve body 1 and the tooth groove 24 through the scroll springs 25. Through the pressing structure on the device, the first rotating plate 22 is squeezed to the left, and the second rotating plate 23 is squeezed to the right, improving the overall stability of the device after docking.

[0040] In this embodiment, the tooth grooves 24 are equally angularly distributed inside the upper half of the sliding sleeve body 1. The positions of the first rotating plate 22 and the second rotating plate 23 correspond to the positions of the tooth grooves 24. Through the tooth grooves 24, the first rotating plate 22 and the second rotating plate 23 can abut against the inner walls of the tooth grooves 24 when moving downward, enabling the device to move up and down stably.

[0041] It should be noted that the present invention is a downhole tool with a high-temperature trigger type sliding sleeve. First, as Figure 1 、 Figure 2 and Figures 5-8 shown, during the use of the device, through the guide plate 2 below the sliding sleeve body 1, when adjacent two sliding sleeve bodies 1 are docked, the guide plate 2 can enable the adjacent two sliding sleeve bodies 1 not to be completely aligned. After the docking is completed, the output shaft of the motor 18 rotates, and the traction steel rope 17 wound around the output shaft of the motor 18 becomes slack. The slack traction steel rope 17 can cause the pressure ring 15 to be pulled downward under the action of the loose-tightening rope 20 above the fixed shaft 19. At this time, combined with Figures 5-8 shown, the connecting plate 16 extends into the lower sliding sleeve body 1, and the first rotating plate 22 and the second rotating plate 23 automatically unfold under the action of the scroll spring 25 outside the fixed shaft 19. The first rotating plate 22 and the second rotating plate 23 abut against the inner walls of the tooth grooves 24, completing the docking work of the adjacent two sliding sleeve bodies 1;

[0042] As Figures 1-5 shown, when the device encounters high temperature, the heat on the heat conduction plate 12 causes the shape memory alloy spring 13 to automatically contract, and the pressing block 14 moves to the right. At this time, the pressing block 14 automatically disengages from the inside of the baffle 4, so that the baffle 4 on the device can automatically move downward under the pulling force of the first spring 5, thereby automatically opening the opening 3. The heat insulation plate 6 enables the high temperature outside the device not to affect the normal operation of the first spring 5. When the device is in use, it can also automatically open the opening 3 when the pressure is too high. When the pressure is too high, the first piston 7 moves to the left under the action of the pressure, thereby pushing the second piston 8 to the left. At this time, the upper and lower sides of the conductive contact piece 9 connect the battery 10 and the electric heating wire 11. It should be noted that the battery 10 uses a low-voltage power supply to avoid danger caused by the overheating of the electric heating wire 11. When the temperature rises, the baffle 4 is automatically opened again and remains in the open state all the time, enabling the device to automatically trigger the opening of the opening 3 at high temperature or high pressure and continuously maintain the open state.

[0043] Although the present invention has been described above with reference to the embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in the present invention can be combined with each other in any way, and the exhaustive description of these combinations is not given in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A downhole tool with a high-temperature trigger sleeve, comprising a sleeve body (1), characterized in that: On the left and right sides below the sliding sleeve body (1), there are fixedly connected guiding plates (2). An opening (3) is arranged on the surface of the sliding sleeve body (1). A baffle plate (4) is slidably installed inside the opening (3). A pressing block (14) penetrates through the top of the baffle plate (4). The end of the pressing block (14) is fixedly connected to a shape memory alloy spring (13). The end of the shape memory alloy spring (13) is connected to a heat conducting plate (12). The heat conducting plate (12) and the sliding sleeve body (1) are fixedly connected. Inside the sliding sleeve body (1) above the heat conducting plate (12), a first piston (7) is slidably installed. Inside the sliding sleeve body (1) on the left side of the first piston (7), a second piston (8) is slidably installed. The front end of the second piston (8) is fixedly connected to a conductive contact piece (9). Above the left upper side of the conductive contact piece (9), a battery (10) is installed. Below the battery (10), there is an electric heating wire (11). The baffle plate (4) is connected to the sliding sleeve body (1) through a first spring (5). Inside the sliding sleeve body (1), a pressing ring (15) is slidably installed. Below the pressing ring (15), there is a connecting plate (16) fixedly connected. On the left side below the connecting plate (16), a first rotating plate (22) is rotatably installed. On the right side below the connecting plate (16), a second rotating plate (23) is rotatably installed. Inside the upper part of the sliding sleeve body (1), a tooth groove (24) is opened.

2. The downhole tool with a high-temperature trigger sleeve according to claim 1, wherein: The guiding plates (2) are symmetrically distributed on the left and right sides of the sliding sleeve body (1). The guiding plates (2) are inclined. The outer wall of the lower half of the sliding sleeve body (1) is in mutual contact with the inner wall of the upper half of the adjacent sliding sleeve body (1).

3. The downhole tool with a high-temperature trigger sliding sleeve according to claim 1, characterized in that: The baffle plate (4) is in sliding connection with the sliding sleeve body (1). An insulating plate (6) is arranged at the lower right of the baffle plate (4). The material of the insulating plate (6) is aerogel. The positions of the insulating plate (6) and the first spring (5) correspond to each other.

4. The downhole tool with a high-temperature trigger sleeve according to claim 1, characterized in that: The central axes of the first piston (7), the second piston (8), and the conductive contact piece (9) are collinear. Oblique cutting surfaces are arranged on both the upper and lower sides of the left half of the conductive contact piece (9). The positions of the wires below the battery (10) and above the electric heating wire (11) correspond to the position of the conductive contact piece (9). The conductive contact piece (9) and the sliding sleeve body (1) form a first sliding structure through the first piston (7) and the second piston (8).

5. The downhole tool with a high-temperature triggered sliding sleeve according to claim 1, wherein: The pressing block (14) and the baffle plate (4) form a second sliding structure through the electric heating wire (11), the heat conducting plate (12), and the shape memory alloy spring (13). The pressing blocks (14) are equally spaced on the baffle plate (4).

6. The downhole tool with a high-temperature trigger sliding sleeve according to claim 1, characterized in that: A connecting shaft (21) is fixedly connected to the front end of the bottom of the connecting plate (16). The pressing ring (15), the connecting plate (16) and the connecting shaft (21) are integrally formed. A tensioning rope (20) is bolted to the lower part on the right side of the pressing ring (15), and a towing steel rope (17) is bolted to the upper part on the right side of the pressing ring (15). A motor (18) is fixedly connected to the upper right of the sliding sleeve body (1). The output shaft of the motor (18) is connected to the towing steel rope (17). A fixed shaft (19) is fixedly installed at the lower right of the sliding sleeve body (1), and the fixed shaft (19) and the tensioning rope (20) are fixedly connected.

7. The downhole tool with a high-temperature triggered sliding sleeve according to claim 1, wherein: Both the first rotating plate (22) and the second rotating plate (23) are connected to the connecting shaft (21) through a scroll spring (25), and the connection mode between the first rotating plate (22) and the second rotating plate (23) is a rotating connection.

8. The downhole tool with a high-temperature trigger sleeve according to claim 7, characterized in that: The scroll springs (25) on the first rotating plate (22) and the second rotating plate (23) have opposite winding directions, and the first rotating plate (22) and the second rotating plate (23) form a pressing structure with the sliding sleeve body (1) and the tooth groove (24) through the scroll spring (25).

9. The downhole tool with a high-temperature trigger sleeve according to claim 8, characterized in that: The tooth grooves (24) are equiangularly distributed inside the upper half of the sliding sleeve body (1), and the positions of the first rotating plate (22) and the second rotating plate (23) correspond to the positions of the tooth grooves (24).

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