Thermal expansion and contraction device for heavy oil injection and production

Abstract

The application belongs to the technical field of heavy oil exploitation equipment, and particularly relates to a heat insulation telescopic device for heavy oil injection and production, which comprises an outer pipeline, an inner pipeline movably connected to the inner side of the outer pipeline, a hollow cavity with a ring-shaped cross section is formed on the inner wall of the outer pipeline, and a ring-shaped partition plate is integrally formed at the hollow cavity of the outer pipeline, a power chamber and a telescopic transmission chamber are formed above and below the ring-shaped partition plate respectively, a ring-shaped lifting plate is movably arranged at the telescopic transmission chamber of the outer pipeline, and the inner wall of the ring-shaped lifting plate is fixedly connected with the outer wall of the inner pipeline. The power chamber and the telescopic transmission chamber are arranged on the inner wall of the outer pipeline, and are matched with the arrangement of a plurality of threaded rods, transmission gears and toothed rings, so that stable telescopic transmission of the inner pipeline can be realized, the problems that the telescopic stability is insufficient, the telescopic device is prone to jamming, and the adjusted position is prone to deviation due to the lack of effective positioning structure in the prior art heat insulation telescopic device for heavy oil injection and production are solved.

Description

Technical Field

[0001] This invention relates to the field of heavy oil extraction equipment technology, specifically a heavy oil injection and production thermal insulation expansion device. Background Technology

[0002] Heavy oil has the characteristics of high viscosity and high pour point, which requires high adaptability of injection and production equipment during the extraction process. As a core supporting equipment, the heavy oil injection and production thermal insulation expansion device needs to realize the flexible expansion and contraction adjustment of the pipeline, while having good thermal insulation and sealing performance to ensure the fluidity of heavy oil in the wellbore.

[0003] In existing technologies, such as the heavy oil injection and production thermal insulation expansion joint with authorization announcement number CN218439258U, a single-drive threaded rod combined with a moving block is used to achieve the expansion and contraction adjustment of the inner pipeline. This single-drive structure has obvious defects in actual use: under the action of a single driving force, uneven force is prone to occur when the inner pipeline expands and contracts, resulting in insufficient stability of expansion and contraction adjustment, and it is very easy to get stuck, affecting the normal use of the equipment; at the same time, this structure lacks an effective positioning and locking component. After the inner pipeline is expanded and contracted to the target position, it is easy to deviate from its position due to factors such as vibration and fluid impact in the wellbore, which cannot guarantee the stability of injection and production operations. Therefore, there are certain defects and deficiencies, and improvements are needed. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a heavy oil injection and production thermal insulation expansion device. By setting a power chamber and an expansion transmission chamber on the inner wall of the outer pipeline, and cooperating with multiple threaded rods, transmission gears and toothed rings, stable expansion and contraction transmission of the inner pipeline can be achieved. This solves the problems of insufficient expansion and contraction stability and easy jamming caused by the single drive structure of existing heavy oil injection and production thermal insulation expansion devices, and the lack of an effective positioning structure that makes the position easily deviate after adjustment.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0008] A thermally insulating and expandable device for heavy oil injection and production includes an outer pipe and an inner pipe movably connected to the inner side of the outer pipe. The inner wall of the outer pipe has a hollow cavity with an annular cross-section, and an annular partition is integrally formed on the outer pipe at the hollow cavity. A power chamber and a telescopic transmission chamber are formed above and below the annular partition, respectively. An annular lifting plate is movably installed at the telescopic transmission chamber of the outer pipe. The inner wall of the annular lifting plate is connected and fixed to the outer wall of the inner pipe, realizing the telescopic sliding of the inner pipe inside the outer pipe. An array of screws is rotatably connected to the telescopic transmission chamber of the outer pipe, and the annular lifting plate has screw holes corresponding to the screws that are adapted to the screws.

[0009] Furthermore, the screw is rotatably connected to the outer pipe and the annular partition via a bearing, and the upper end of the screw extends through the annular partition into the power chamber and is fixedly connected to a transmission gear. A gear ring is rotatably connected to the inner wall of the power chamber, and the gear ring meshes with the transmission gear. An array of limiting rods is fixedly connected in the telescopic transmission chamber, and the annular lifting plate has a limiting hole corresponding to the limiting rod.

[0010] Furthermore, a rotating shaft is rotatably connected to the outer pipe via a bearing. One end of the rotating shaft extends into the power chamber and is fixedly connected to a drive bevel gear. The upper end of one of the screws is coaxially fixedly connected to a driven bevel gear, and the drive bevel gear meshes with the driven bevel gear.

[0011] Furthermore, a rotating block is fixedly connected to the other end of the rotating shaft.

[0012] Furthermore, the outer wall of the outer pipe is fixedly connected to a support on the outside of the rotating shaft, and an array of locking grooves are opened on one side of the support around the circumference of the rotating shaft. A locking rod is inserted into the rotating block, and one end of the locking rod is threaded to the locking groove. The locking groove is a threaded groove, and the locking rod is a threaded rod.

[0013] Furthermore, a vacuum insulation layer is provided axially inside the inner pipe, and a sealing layer is provided at the connection between the outer wall of the inner pipe and the outer pipe.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, the present invention provides a thermal insulation expansion joint for heavy oil injection and production, which has the following beneficial effects:

[0016] 1. This invention employs an array-distributed multi-screw drive structure, utilizing the multi-stage linkage of the driving bevel gear, driven bevel gear, transmission gear, and gear ring to achieve synchronous rotation of all screws. This provides a uniform, multi-point synchronous driving force for the annular lifting plate, fundamentally solving the problem of uneven force distribution during internal pipe expansion and contraction caused by existing single-drive structures, and significantly improving adjustment stability. Simultaneously, the guide and limiting structure with limit rods and limit holes effectively prevents the annular lifting plate from deflecting, completely avoiding expansion and contraction jamming and ensuring smooth equipment operation.

[0017] 2. This invention achieves precise positioning and locking of the inner pipeline after expansion and contraction adjustment through the cooperation of the rotating block, support, locking groove and locking rod. After the rotating shaft drives the inner pipeline to the target position, the locking rod is threaded into the corresponding locking groove, which can effectively fix the position of the rotating shaft and prevent it from rotating due to wellbore vibration, fluid impact and other factors, thereby avoiding the displacement of the inner pipeline position, ensuring the stability of heavy oil injection and production operations, and solving the defect of existing devices without an effective positioning structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional perspective view of the present invention;

[0020] Figure 3 This is a three-dimensional cross-sectional view of the external pipeline in this invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged view of the structure at point A in the middle;

[0022] Figure 5 This is a three-dimensional cross-sectional view of the inner pipe in this invention.

[0023] In the diagram: 1. External pipe; 2. Internal pipe; 3. Power chamber; 4. Annular lifting plate; 5. Limiting rod; 6. Telescopic transmission chamber; 7. Screw; 8. Annular partition; 9. Transmission gear; 10. Driven bevel gear; 11. Gear ring; 12. Driven bevel gear; 13. Rotating shaft; 14. Support; 15. Locking groove; 16. Rotating block; 17. Locking rod; 18. Vacuum insulation layer; 19. Sealing layer. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example

[0026] like Figures 1-5 As shown, an embodiment of the present invention provides a thermal insulation and expansion device for heavy oil injection and production, comprising an outer pipe 1 and an inner pipe 2 movably connected to the inner side of the outer pipe 1. The inner wall of the outer pipe 1 has a hollow cavity with an annular cross-section, and an annular partition 8 is integrally formed at the hollow cavity of the outer pipe 1. A power chamber 3 and an expansion transmission chamber 6 are formed above and below the annular partition 8, respectively. An annular lifting plate 4 is movably arranged at the expansion transmission chamber 6 of the outer pipe 1. The inner wall of the annular lifting plate 4 is connected and fixed to the outer wall of the inner pipe 2, realizing the expansion and contraction sliding of the inner pipe 2 inside the outer pipe 1. An array of screws 7 are rotatably connected to the expansion transmission chamber 6 of the outer pipe 1, and the annular lifting plate 4 has screw holes adapted to the screws 7 at the corresponding screws 7.

[0027] It should be noted that the inner pipe 2 is movably sleeved inside the outer pipe 1. The inner wall of the outer pipe 1 has an annular hollow cavity. An integrally formed annular partition 8 in this hollow cavity divides it into an upper power chamber 3 and a lower telescopic transmission chamber 6. An annular lifting plate 4 is installed in the telescopic transmission chamber 6, and its inner wall is fixedly connected to the outer wall of the inner pipe 2. The outer pipe 1 is rotatably connected to an array of screws 7 at the telescopic transmission chamber 6. When the screws 7 rotate, they will form a threaded transmission with the matching screw holes on the annular lifting plate 4, driving the annular lifting plate 4 to move axially up and down along the screws 7. This, in turn, pulls the inner pipe 2 to complete a stable telescopic sliding inside the outer pipe 1, realizing the telescopic sliding of the inner pipe 2 inside the outer pipe 1 and adjusting the overall length. This adjustment method is more stable and has a better effect.

[0028] like Figure 3 and Figure 4 As shown, in some embodiments, the screw 7 is rotatably connected to the outer pipe 1 and the annular partition 8 via a bearing, and the upper end of the screw 7 extends through the annular partition 8 into the power chamber 3 and is fixedly connected to a transmission gear 9. A gear ring 11 is rotatably connected to the inner wall of the power chamber 3, and the gear ring 11 meshes with the transmission gear 9. An array of limiting rods 5 are fixedly connected in the telescopic transmission chamber 6, and the annular lifting plate 4 has a limiting hole corresponding to the limiting rod 5 that is adapted to the limiting rod 5.

[0029] It should be noted that the screw 7 is rotatably connected to the outer pipe 1 and the annular partition 8 through bearings. The upper end of the screw 7 extends through the annular partition 8 into the power chamber 3 and is fixedly connected to the transmission gear 9. The inner wall of the power chamber 3 is rotatably connected to the gear ring 11, and the gear ring 11 meshes with all the transmission gears 9. When a single screw 7 rotates, it can drive the gear ring 11 to rotate synchronously through the transmission gear 9, thereby driving the other screws 7 to rotate together, realizing the synchronous transmission of multiple screws 7. At the same time, the telescopic transmission chamber 6 is fixed with an array of limiting rods 5. The limiting rods 5 pass through the matching limiting holes on the annular lifting plate 4, which plays a precise guiding role for the movement of the annular lifting plate 4 and effectively limits its circumferential deflection. This transmission method has high stability and good performance.

[0030] like Figure 4 As shown, in some embodiments, a rotating shaft 13 is rotatably connected to the outer pipe 1 via a bearing. One end of the rotating shaft 13 extends into the power chamber 3 and is fixedly connected to a drive bevel gear 12. The upper end of one of the screws 7 is coaxially fixedly connected to a driven bevel gear 10, and the drive bevel gear 12 meshes with the driven bevel gear 10.

[0031] It should be noted that a rotating shaft 13 is rotatably connected to the outer pipe 1 via a bearing. One end of the rotating shaft 13 extends into the power chamber 3 and is fixedly connected to a drive bevel gear 12. A driven bevel gear 10 is coaxially fixed to the upper end of one of the screws 7. The drive bevel gear 12 and the driven bevel gear 10 mesh with each other. When the rotating shaft 13 is rotated, the drive bevel gear 12 will drive the driven bevel gear 10 to rotate synchronously, thereby driving the screw 7 connected to it to rotate, providing the initial power input for the entire transmission structure and starting the linkage transmission of the multiple screws 7.

[0032] like Figure 4 As shown, in some embodiments, a rotating block 16 is fixedly connected to the other end of the rotating shaft 13.

[0033] It should be noted that the rotation control of the rotating shaft 13 is achieved by fixing the rotating block 16 at the other end of the rotating shaft 13.

[0034] like Figure 4 As shown, in some embodiments, the outer wall of the outer pipe 1 is fixedly connected to a support 14 on the outside of the rotating shaft 13, and an array of locking grooves 15 are opened on one side of the support 14 around the circumference of the rotating shaft 13. A locking rod 17 is inserted into the rotating block 16, and one end of the locking rod 17 is threaded to the locking groove 15. The locking groove 15 is a threaded groove, and the locking rod 17 is a threaded rod.

[0035] It should be noted that a support 14 is fixedly connected to the outer wall of the outer pipe 1 at the position outside the rotating shaft 13. An array of locking grooves 15 are opened on one side of the support 14 around the circumference of the rotating shaft 13. A locking rod 17 is inserted into the rotating block 16. The locking groove 15 is a threaded groove and the locking rod 17 is a threaded rod. When the inner pipe 2 is adjusted to the target position, the locking rod 17 is screwed into the corresponding locking groove 15. The position of the rotating block 16 is fixed by the tightness of the threaded connection, thereby restricting the rotation of the rotating shaft 13. This achieves precise positioning and locking after the device is adjusted to prevent position deviation.

[0036] like Figure 5 As shown, in some embodiments, a vacuum insulation layer 18 is provided axially inside the inner pipe 2, and a sealing layer 19 is provided at the connection between the outer wall of the inner pipe 2 and the outer pipe 1.

[0037] It should be noted that a vacuum insulation layer 18 is provided axially inside the inner pipe 2. By utilizing the characteristic that there is no heat conduction medium in the vacuum environment, heat transfer during the transportation of heavy oil is effectively blocked. At the same time, a sealing layer 19 is provided at the connection between the outer wall of the inner pipe 2 and the outer pipe 1. The sealing layer 19 can tightly fill the gap between the two, which can not only prevent fluid leakage during the transportation of heavy oil, but also improve the overall sealing performance of the device.

[0038] The working principle and usage steps of this invention are as follows: Rotating the rotating block 16 drives the rotating shaft 13 to rotate, the rotating shaft 13 drives the active bevel gear 12 to rotate, the active bevel gear 12 meshes with the driven bevel gear 10 to make the corresponding screw 7 rotate, the screw 7 drives the transmission gear 9 to rotate, the transmission gear 9 meshes with the toothed ring 11 to make all the transmission gears 9 rotate synchronously, and then drives all the arrayed screws 7 to rotate synchronously. The screw 7 is threadedly engaged with the screw hole of the annular lifting plate 4. Under the guidance and limitation of the limiting rod 5, the annular lifting plate 4 moves axially up and down along the screw 7. The annular lifting plate 4 drives the inner pipe 2 to complete the telescopic sliding inside the outer pipe 1. After adjusting to the target position, the locking rod 17 is screwed into the corresponding locking groove 15 on the support 14 to fix the position of the rotating block 16 and the rotating shaft 13, and complete the positioning and locking of the inner pipe 2. During operation, the vacuum insulation layer 18 of the inner pipe 2 achieves heat insulation, and the sealing layer 19 achieves the sealing at the connection between the outer pipe 1 and the inner pipe 2.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermal insulation expansion joint for heavy oil injection and production, comprising an outer pipe (1) and an inner pipe (2) movably connected to the inner side of the outer pipe (1), characterized in that: The inner wall of the outer pipe (1) is provided with a hollow cavity with an annular cross section, and the outer pipe (1) is integrally formed with an annular partition (8) at the hollow cavity. The upper and lower parts of the annular partition (8) are respectively formed with a power chamber (3) and a telescopic transmission chamber (6). An annular lifting plate (4) is movably provided at the telescopic transmission chamber (6) of the outer pipe (1). The inner wall of the annular lifting plate (4) is connected and fixed to the outer wall of the inner pipe (2), so as to realize the telescopic sliding of the inner pipe (2) inside the outer pipe (1). The telescopic transmission chamber (6) of the outer pipe (1) is rotatably connected to an array of screws (7), and the annular lifting plate (4) is provided with screw holes that are compatible with the screws (7) at the corresponding screws (7).

2. The heavy oil injection and production thermal insulation expansion joint device according to claim 1, characterized in that: The screw (7) is rotatably connected to the outer pipe (1) and the annular partition (8) through the bearing, and the upper end of the screw (7) extends through the annular partition (8) into the power chamber (3) and is fixedly connected to the transmission gear (9). A toothed ring (11) is rotatably connected to the inner wall of the power chamber (3), and the toothed ring (11) meshes with the transmission gear (9). An array of limiting rods (5) is fixedly connected in the telescopic transmission chamber (6), and the annular lifting plate (4) has a limiting hole that matches the limiting rod (5) at the corresponding position of the limiting rod (5).

3. The heavy oil injection and production thermal insulation expansion device according to claim 2, characterized in that: The outer pipe (1) is rotatably connected to a rotating shaft (13) via a bearing. One end of the rotating shaft (13) extends into the power chamber (3) and is fixedly connected to an active bevel gear (12). The upper end of one of the screws (7) is coaxially fixedly connected to a driven bevel gear (10). The active bevel gear (12) meshes with the driven bevel gear (10).

4. The heavy oil injection and production thermal insulation expansion device according to claim 3, characterized in that: A rotating block (16) is fixedly connected to the other end of the rotating shaft (13).

5. A heavy oil injection and production thermal insulation expansion joint according to claim 4, characterized in that: The outer wall of the outer pipe (1) is fixedly connected to a support (14) on the outside of the rotating shaft (13), and an array of locking grooves (15) are opened on one side of the support (14) around the circumference of the rotating shaft (13). A locking rod (17) is inserted into the rotating block (16), and one end of the locking rod (17) is threaded onto the locking groove (15). The locking groove (15) is a threaded groove, and the locking rod (17) is a threaded rod.

6. The heavy oil injection and production thermal insulation expansion joint according to claim 1, characterized in that: The inner pipe (2) has a vacuum insulation layer (18) axially arranged inside, and a sealing layer (19) is provided at the connection between the outer wall of the inner pipe (2) and the outer pipe (1).

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