A large-displacement steam pipeline device and heat injection method for a mobile marine heat injection system

Abstract

The present invention relates to a large-displacement steam pipeline device and a heat injection method for a marine mobile heat injection system. The steam pipeline device includes a fixed-end steam pipeline, a mobile-end steam pipeline, a pier, and a compensating steam pipeline. The compensating steam pipeline is respectively formed with a first U-shaped bend portion, a second U-shaped bend portion, and a third U-shaped bend portion. One end of the compensating steam pipeline is connected to a wellhead on a fixed platform through a fixed-end steam pipeline, and the other end is connected to a boiler on a mobile platform through a mobile-end steam pipeline. The heat injection method includes the installation of the steam pipeline device, heat injection, and separation of the steam pipeline device. The present invention utilizes the arrangement of multiple expansion bend structures to absorb the displacement stress caused by the pier displacement and thermal expansion displacement, so as to eliminate pipeline fatigue damage caused by wave periodic motion and increase the life of the overall device. The device is applicable to the heat injection needs of nearby heavy oil fields.

Description

Technical Field

[0001] The present invention relates to the technical field of marine petroleum engineering, and in particular to a large-displacement steam pipeline device and a heat injection method for a marine mobile heat injection system. Background Art

[0002] Unconventional heavy oil reserves are abundant in the Bohai Sea, and offshore thermal recovery is becoming a new driver of offshore oil production growth. However, the relatively fragmented nature of the Bohai Sea's heavy oil resource blocks makes development difficult, while traditional development models are costly and generally offer poor economic returns. These issues hinder the development of these resources in my country's Bohai Sea.

[0003] Currently, heavy oil development is mostly carried out through mobile heat injection platforms, which can provide flexible steam throughput and steam drive thermal recovery facilities for the blocks, and can achieve coordinated optimization among multiple blocks to achieve economies of scale, ultimately reducing development difficulty and improving overall economic efficiency.

[0004] Mobile heat injection platforms are different from conventional jacket-type fixed platforms. In marine mobile heat injection systems, relative displacement between the mobile and fixed platforms occurs due to the influence of wind and waves, causing the steam pipeline connecting the two platforms to experience horizontal and vertical tension and compression. This poses a challenge to the design of the high-temperature, high-pressure steam pipeline between the mobile heat injection platform and the fixed thermal recovery wellhead platform. Summary of the Invention

[0005] The purpose of the present invention is to provide a large-displacement steam pipeline device and heat injection method for a mobile ocean heat injection system, so as to solve the problem in the prior art that large shaking and displacement between the mobile platform and the fixed platform of the mobile ocean heat injection system under the influence of the ocean environment easily occur, resulting in difficulty in steam pipeline heat injection.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a large-displacement steam pipeline device for a mobile ocean heat injection system. The mobile ocean heat injection system includes a fixed platform and a mobile platform. The steam pipeline device includes a fixed-end steam pipeline, a mobile-end steam pipeline, a pier, and a compensating steam pipeline.

[0008] The trestle is horizontally erected between the fixed platform and the mobile platform, the compensating steam pipeline is horizontally arranged on the trestle, and one end of the compensating steam pipeline is connected to the wellhead on the fixed platform through the fixed end steam pipeline, and the other end of the compensating steam pipeline is connected to the boiler on the mobile platform through the mobile end steam pipeline;

[0009] The compensating steam pipeline is formed with a first U-shaped bend portion in a horizontal direction above the trestle at a position close to the fixed platform, a second U-shaped bend portion in a horizontal direction above the trestle at a position close to the mobile platform, and a third U-shaped bend portion in a vertical direction on the side of the trestle at a position close to the first U-shaped bend portion;

[0010] The first U-shaped bend portion and the third U-shaped bend portion constitute an expansion bend structure for naturally compensating for the displacement of the trestle, and the second U-shaped bend portion constitutes an expansion bend structure for naturally compensating for the thermal displacement of the compensation steam pipeline.

[0011] Furthermore, the U-shaped openings of the first U-shaped bend portion and the second U-shaped bend portion are both horizontally facing the side where the third U-shaped bend portion is located, the U-shaped opening of the third U-shaped bend portion is vertically facing upward, and the third U-shaped bend portion is arranged between the first U-shaped bend portion and the second U-shaped bend portion, and forms a continuous U-shaped bend structure with the first U-shaped bend portion.

[0012] Furthermore, the first U-shaped bend portion, the second U-shaped bend portion and the third U-shaped bend portion are respectively arranged on the trestle through first sliding brackets, and a group of the first sliding brackets are respectively arranged at the tube body in the length direction and width direction of the U-shaped bend portion.

[0013] Furthermore, a first flange is provided on the end side of the pier close to the fixed platform, and one end of the compensation steam pipeline is connected to the fixed end steam pipeline through the first flange. A second flange is provided on the end side of the pier close to the mobile platform, and the other end of the compensation steam pipeline is connected to the mobile end steam pipeline through the second flange. The pipe body between the first U-shaped bend portion and the first flange forms a first straight pipe portion vertically arranged on the end side of the pier, the pipe body between the third U-shaped bend portion and the second U-shaped bend portion forms a second straight pipe portion horizontally arranged above the pier, and the pipe body between the second U-shaped bend portion and the second flange forms a third straight pipe portion horizontally arranged above the pier, wherein the first flange and the second flange are respectively arranged on the pier through flange brackets.

[0014] Furthermore, a first connecting pipeline is provided between the compensating steam pipeline and the fixed-end steam pipeline, one end of the first connecting pipeline is connected to the compensating steam pipeline through the first flange, and the other end of the first connecting pipeline is connected to the fixed-end steam pipeline through a third flange, and a second connecting pipeline is provided between the compensating steam pipeline and the mobile-end steam pipeline, one end of the second connecting pipeline is connected to the compensating steam pipeline through the second flange, and the other end of the second connecting pipeline is connected to the mobile-end steam pipeline through a fourth flange, wherein the third flange and the fourth flange are respectively arranged on corresponding platforms through flange brackets.

[0015] Furthermore, the first straight pipe portion, the second straight pipe portion and the third straight pipe portion are respectively arranged on the trestle via second sliding brackets.

[0016] Furthermore, the first straight pipe portion and the second straight pipe portion are respectively arranged on the trestle through a first guide bracket for horizontal limitation, and the second straight pipe portion is also arranged on the trestle through a second guide bracket for axial limitation, wherein multiple brackets at the same position on the pipeline are arranged at intervals.

[0017] Furthermore, the pipe body of the fixed-end steam pipeline close to the fixed platform is set on the fixed platform through a first fixed bracket, and the pipe body of the mobile-end steam pipeline close to the mobile platform is set on the mobile platform through a second fixed bracket, and the fixed-end steam pipeline and the mobile-end steam pipeline are also respectively set on the corresponding platforms through a third sliding bracket.

[0018] Furthermore, the pipe bodies of the fixed-end steam pipeline, the mobile-end steam pipeline and the compensation steam pipeline are all hard pipe structures, and the outer side of the steam pipeline is covered with an insulation layer, and the insulation layer is a glass wool material layer.

[0019] Based on the above-mentioned large-displacement steam pipeline device of the marine mobile heat injection system, the present invention also provides a heat injection method, comprising:

[0020] The flange interface, the compensating steam pipeline, and the brackets on the compensating steam pipeline are constructed and installed together with the trestle; the flange interface, the fixed end steam pipeline, and the brackets on the fixed end steam pipeline are constructed and installed together with the fixed platform; the flange interface, the mobile end steam pipeline, and the brackets on the mobile end steam pipeline are constructed and installed together with the mobile platform;

[0021] The trestle is installed on the mobile platform through a rotating device, and after the trestle and its rotating device are installed and debugged on the mobile platform, the rotating device is controlled to rotate the fixed end of the trestle to the fixed platform;

[0022] Connecting the mobile end steam pipeline to the compensating steam pipeline through a flange interface, connecting the fixed end steam pipeline to the compensating steam pipeline through a flange interface, and after the trestle and the fixed platform are debugged at sea, controlling the boiler to inject heat;

[0023] After the heat injection is completed, the flanges at both ends of the trestle are removed, and the compensating steam pipeline is controlled to rotate back to the mobile platform together with the trestle.

[0024] The present invention adopts the above technical solution, which has the following beneficial effects:

[0025] 1. The arrangement of multiple expansion elbow structures can absorb the displacement stress caused by trestle displacement and thermal expansion displacement, so as to meet the heat injection requirements of nearby heavy oil fields and eliminate pipeline fatigue damage caused by wave periodic motion;

[0026] 2. The steam pipeline is connected by a hard pipe that is resistant to high temperature and high pressure, which overcomes the temperature and pressure limitations of the hose connection, making the system operation safer and more reliable and reducing costs;

[0027] 3. The expansion bend is used for natural compensation, and the overall structure does not need to be replaced during its service life, saving operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. Throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of a steam pipeline device provided by an embodiment of the present invention;

[0030] Figure 2 This is a structural schematic diagram of the connection between the first U-shaped bend portion and the third U-shaped bend portion of a steam pipeline device provided by an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the assembly structure of the connecting pipelines of a steam pipeline device provided by an embodiment of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the distribution positions of various supports of a steam pipeline device provided by an embodiment of the present invention.

[0033] The symbols in the accompanying drawings represent the following:

[0034] 1. Fixed-end steam pipeline; 2. Mobile-end steam pipeline; 3. Trestle; 4. Compensating steam pipeline; 41. First U-shaped bend; 42. Second U-shaped bend; 43. Third U-shaped bend; 44. First flange; 45. Second flange; 46. First straight pipe; 47. Second straight pipe; 48. Third straight pipe; 5. First connecting pipeline; 51. Third flange; 6. Second connecting pipeline; 61. Fourth flange. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0036] Because the mobile platform and fixed platform of a traditional marine mobile heat injection system are prone to large swaying displacement under the influence of the marine environment, steam pipeline heat injection becomes difficult. The present invention provides a large-displacement steam pipeline device and heat injection method for a marine mobile heat injection system. By disposing a fixed-end steam pipeline, a mobile-end steam pipeline, a pier, and a compensating steam pipeline between the fixed platform and the mobile platform, the first U-shaped bend and the third U-shaped bend on the compensating steam pipeline form an expansion bend structure for absorbing the displacement of the pier, and the second U-shaped bend forms an expansion bend structure for absorbing the thermal displacement of the steam pipeline. This achieves compensation for large displacements between the mobile platform and the fixed platform caused by marine environmental factors, as well as displacement compensation due to thermal expansion and contraction of the pipeline itself. This makes it suitable for the heat injection needs of nearby heavy oil fields and can eliminate pipeline fatigue damage caused by periodic wave motion.

[0037] The scheme of the present invention is described in detail below through examples.

[0038] Example

[0039] like Figure 1 The present invention provides a large-displacement steam pipeline system for a mobile marine heat injection system. The system comprises a conventional fixed platform and a mobile platform. The fixed platform houses the wellhead to be injected with heat, while the mobile platform houses the boiler performing the injection. Based on this heat injection system, the steam pipeline system of the present invention comprises a fixed-end steam pipeline 1, a mobile-end steam pipeline 2, a trestle 3, and a compensating steam pipeline 4.

[0040] The trestle 3 is horizontally erected between the fixed platform and the mobile platform, and the compensating steam pipeline 4 is horizontally arranged on the trestle 3. One end of the compensating steam pipeline 4 is connected to the wellhead on the fixed platform via the fixed end steam pipeline 1, and the other end of the compensating steam pipeline 4 is connected to the boiler on the mobile platform via the mobile end steam pipeline 2. The compensating steam pipeline 4 has a first horizontal U-shaped bend 41 formed above the trestle 3 near the fixed platform; a second horizontal U-shaped bend 42 formed above the trestle 3 near the mobile platform; and a third vertical U-shaped bend 43 formed on the side of the trestle near the first U-shaped bend 41 (see FIG. 4 ). Figure 2 The first U-shaped bend 41 and the third U-shaped bend 43 constitute an expansion bend structure for naturally compensating for the displacement of the trestle 3 , and the second U-shaped bend 42 constitutes an expansion bend structure for naturally compensating for the thermal displacement of the compensation steam pipeline 4 .

[0041] Furthermore, the U-shaped openings of the first U-shaped bend portion 41 and the second U-shaped bend portion 42 are both horizontally oriented to the side of the third U-shaped bend portion 43, while the U-shaped opening of the third U-shaped bend portion 43 is vertically upward. The third U-shaped bend portion 43 is disposed between the first U-shaped bend portion 41 and the second U-shaped bend portion 42, and the third U-shaped bend portion 43 forms a continuous U-shaped bend structure with the first U-shaped bend portion 41. Preferably, the side arm of the first U-shaped bend portion 41 is 4.5 meters long and 3.8 meters wide; the side arm of the second U-shaped bend portion 42 is 2 meters long and 3.2 meters wide; and the side arm of the third U-shaped bend portion 43 is 4 meters long and 3.2 meters wide. Through the arrangement of this structure, the first U-shaped bend portion 41 and the third U-shaped bend portion 43 are utilized to absorb the displacement stress of the horizontal and axial displacements of the pier 3 caused by marine environmental factors, and the second U-shaped bend portion 42 absorbs the thermal displacement stress of the pipeline itself caused by high-temperature steam, thereby eliminating pipeline fatigue damage caused by periodic wave motion.

[0042] Furthermore, the first U-bend 41, the second U-bend 42, and the third U-bend 43 are each mounted on the trestle 3 via a first sliding bracket, and a set of first sliding brackets (not shown) are provided on the length and width of each U-bend. This structure utilizes the sliding brackets to support the pipes at each U-bend, preventing the pipes from bending and damaging due to their own weight, and limiting only the vertical downward displacement of the pipes.

[0043] Furthermore, a first flange 44 is provided on the end of the trestle 3 near the fixed platform, through which one end of the compensating steam pipeline 4 is connected to the fixed-end steam pipeline 1. A second flange 45 is provided on the end of the trestle 3 near the mobile platform, through which the other end of the compensating steam pipeline 4 is connected to the mobile-end steam pipeline 2. Preferably, the specifications of the first flange 44 and the second flange 45 are ASME B16.5, CL2500. Arranging the flanges on the end of the trestle 3 and along the axial direction of the trestle 3 can effectively reduce leakage at the flanges. The first flange 44 and the second flange 45 are respectively mounted on the trestle 3 via flange brackets.

[0044] As described above, the tube between the first U-bend 41 and the first flange 44 forms a first straight tube section 46, vertically positioned at the end of the trestle 3. The tube between the third and second U-bends 43 and 44 forms a second straight tube section 47, horizontally positioned above the trestle 3. The tube between the second U-bend 42 and the second flange 45 forms a third straight tube section 48, horizontally positioned above the trestle 3. The first, second, and third straight tube sections 46, 47, and 48 are each mounted on the trestle 3 via a second sliding bracket. This structural arrangement, utilizing the sliding bracket, supports each straight tube section, preventing the pipe from bending and damaging due to its own weight and limiting only vertical downward displacement of the pipe.

[0045] Furthermore, the first straight pipe portion 46 and the second straight pipe portion 47 are each provided on the trestle 3 via a first guide bracket for horizontal positioning. The first guide bracket can limit the horizontal displacement of the pipeline due to thermal expansion and contraction. The second straight pipe portion 47 is also provided on the trestle 3 via a second guide bracket for axial positioning. The second guide bracket can limit the axial displacement of the pipeline due to thermal expansion and contraction. Multiple brackets at the same position on the pipeline are spaced apart, with the maximum horizontal spacing preferably being 5m. This guide bracket structure ensures that the modal frequency of the pipeline system is increased without affecting the absorption of the displacement of the trestle 3.

[0046] Furthermore, the pipe body of the fixed-end steam pipeline 1 close to the fixed platform is set on the fixed platform through a first fixed bracket, and the pipe body of the mobile-end steam pipeline 2 close to the mobile platform is set on the mobile platform through a second fixed bracket. By utilizing the setting of the fixed bracket, due to the limitation of the fixed bracket, the influence of the displacement of the trestle 3 will not affect the pipelines inside the platform, especially the pipeline layout inside the fixed platforms of different oil fields will not be affected by the pipelines on the trestle 3. Combined with the setting of the flange, the compensating steam pipeline 4 on the trestle 3 is relatively independent of the pipeline design inside the platform, thereby having better adaptability. Among them, the fixed-end steam pipeline 1 and the mobile-end steam pipeline 2 are also respectively set on the corresponding platform through a third sliding bracket. The setting of the sliding bracket is utilized to support the pipelines of each steam pipeline, prevent the pipelines from being bent and damaged due to their own gravity, and only limit the vertical downward displacement of the pipelines.

[0047] Furthermore, the fixed-end steam pipeline 1, the mobile-end steam pipeline 2, and the compensating steam pipeline 4 are all rigid pipe structures. The high-temperature steam pipeline is connected by rigid pipes, overcoming the temperature and pressure limitations of flexible pipe connections. This ensures safer and more reliable system operation and reduces costs. The steam pipeline is also covered with an insulation layer, preferably a glass wool layer with a thickness of 50 mm.

[0048] A preferred embodiment is as follows: a first connecting pipeline 5 is provided between the compensating steam pipeline 4 and the fixed-end steam pipeline 1, one end of the first connecting pipeline 5 is connected to the compensating steam pipeline 4 via a first flange 44, and the other end of the first connecting pipeline 5 is connected to the fixed-end steam pipeline 1 via a third flange 51. A second connecting pipeline 6 is provided between the compensating steam pipeline 4 and the mobile-end steam pipeline 2, one end of the second connecting pipeline 6 is connected to the compensating steam pipeline 4 via a second flange 45, and the other end of the second connecting pipeline 6 is connected to the mobile-end steam pipeline 2 via a fourth flange 61. The third flange 51 and the fourth flange 61 are respectively provided on corresponding platforms via flange brackets. With this structural arrangement, when removing the compensating steam pipeline 4, the compensating steam pipeline 4 can be separated by removing the first connecting pipeline 5 and the second connecting pipeline 6, thereby facilitating the installation and removal of the compensating steam pipeline 4.

[0049] As mentioned above, Figure 4 Point A is an example of the installation position of the first sliding bracket, point B is an example of the installation position of the flange bracket, point C is an example of the installation position of the second sliding bracket, point D is an example of the installation position of the first guide bracket, point E is an example of the installation position of the second guide bracket, point F is an example of the installation position of the first fixed bracket, point G is an example of the installation position of the second fixed bracket, and point H is an example of the installation position of the third sliding bracket.

[0050] Based on the above-mentioned large-displacement steam pipeline device of the marine mobile heat injection system, the present invention also provides a heat injection method, comprising:

[0051] The flange interface, the compensating steam pipeline 4, and the brackets on the compensating steam pipeline 4 are constructed and installed together with the trestle 3. The flange interface, the fixed-end steam pipeline 1, and the brackets on the fixed-end steam pipeline 1 are constructed and installed together with the fixed platform. The flange interface, the mobile-end steam pipeline 2, and the brackets on the mobile-end steam pipeline 2 are constructed and installed together with the mobile platform.

[0052] The trestle 3 is installed on the mobile platform through the rotating device, and after the trestle 3 and its rotating device are installed and debugged on the mobile platform, the rotating device is controlled to rotate the fixed end of the trestle 3 to the fixed platform;

[0053] Connect the mobile end steam pipeline 2 to the compensation steam pipeline 4 through the flange interface, and connect the fixed end steam pipeline 1 to the compensation steam pipeline 4 through the flange interface. After the trestle 3 and the fixed platform are debugged at sea, control the boiler to inject heat;

[0054] After the heat injection is completed, the flanges at both ends of the trestle 3 are removed, and the compensating steam pipeline 4 is controlled to rotate back to the mobile platform together with the trestle 3.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A large-displacement steam pipeline device for a mobile ocean heat injection system, comprising a fixed platform and a mobile platform, characterized in that: The steam pipeline device includes a fixed end steam pipeline, a movable end steam pipeline, a trestle and a compensating steam pipeline; The trestle is horizontally erected between the fixed platform and the mobile platform, the compensating steam pipeline is horizontally arranged on the trestle, and one end of the compensating steam pipeline is connected to the wellhead on the fixed platform through the fixed end steam pipeline, and the other end of the compensating steam pipeline is connected to the boiler on the mobile platform through the mobile end steam pipeline; The compensating steam pipeline is formed with a first U-shaped bend portion in a horizontal direction above the trestle at a position close to the fixed platform, a second U-shaped bend portion in a horizontal direction above the trestle at a position close to the mobile platform, and a third U-shaped bend portion in a vertical direction on the side of the trestle at a position close to the first U-shaped bend portion; The first U-shaped bend portion and the third U-shaped bend portion constitute an expansion bend structure for naturally compensating for displacement of the trestle, and the second U-shaped bend portion constitutes an expansion bend structure for naturally compensating for thermal displacement of the compensation steam pipeline. The U-shaped openings of the first U-shaped bend portion and the second U-shaped bend portion are both horizontally oriented toward the side where the third U-shaped bend portion is located, the U-shaped opening of the third U-shaped bend portion is vertically upward, and the third U-shaped bend portion is arranged between the first U-shaped bend portion and the second U-shaped bend portion, and forms a continuous U-shaped bend structure with the first U-shaped bend portion; The first U-shaped bend pipe portion, the second U-shaped bend pipe portion and the third U-shaped bend pipe portion are respectively arranged on the trestle via first sliding brackets, and a set of the first sliding brackets is respectively provided at the pipe body in the length direction and the width direction of the U-shaped bend pipe portion; The end side of the pier close to the fixed platform is provided with a first flange, and one end of the compensating steam pipeline is connected to the fixed end steam pipeline through the first flange. The end side of the pier close to the mobile platform is provided with a second flange, and the other end of the compensating steam pipeline is connected to the mobile end steam pipeline through the second flange. The pipe body between the first U-shaped bend portion and the first flange forms a first straight pipe portion vertically arranged at the end side of the pier, the pipe body between the third U-shaped bend portion and the second U-shaped bend portion forms a second straight pipe portion horizontally arranged above the pier, and the pipe body between the second U-shaped bend portion and the second flange forms a third straight pipe portion horizontally arranged above the pier, wherein the first flange and the second flange are respectively arranged on the pier through flange brackets.

2. The large-displacement steam pipeline device for a mobile marine heat injection system according to claim 1, characterized in that: A first connecting pipeline is provided between the compensating steam pipeline and the fixed-end steam pipeline, one end of the first connecting pipeline is connected to the compensating steam pipeline through the first flange, and the other end of the first connecting pipeline is connected to the fixed-end steam pipeline through a third flange, and a second connecting pipeline is provided between the compensating steam pipeline and the movable-end steam pipeline, one end of the second connecting pipeline is connected to the compensating steam pipeline through the second flange, and the other end of the second connecting pipeline is connected to the movable-end steam pipeline through a fourth flange, wherein the third flange and the fourth flange are respectively arranged on corresponding platforms through flange brackets.

3. The large-displacement steam pipeline device for a mobile marine heat injection system according to claim 1, characterized in that: The first straight pipe portion, the second straight pipe portion and the third straight pipe portion are respectively arranged on the trestle via second sliding brackets.

4. The large-displacement steam pipeline device for a mobile marine heat injection system according to claim 3, characterized in that: The first straight pipe portion and the second straight pipe portion are respectively arranged on the trestle through a first guide bracket for horizontal limitation, and the second straight pipe portion is also arranged on the trestle through a second guide bracket for axial limitation, wherein multiple brackets at the same position on the pipeline are arranged at intervals.

5. The large-displacement steam pipeline device for a mobile marine heat injection system according to claim 4, characterized in that: The pipe body of the fixed-end steam pipeline close to the fixed platform is set on the fixed platform through a first fixed bracket, and the pipe body of the mobile-end steam pipeline close to the mobile platform is set on the mobile platform through a second fixed bracket, and the fixed-end steam pipeline and the mobile-end steam pipeline are also respectively set on corresponding platforms through a third sliding bracket.

6. The large-displacement steam pipeline device for a mobile marine heat injection system according to claim 1, characterized in that: The pipe bodies of the fixed-end steam pipeline, the mobile-end steam pipeline and the compensation steam pipeline are all hard pipe structures, and the outer side of the steam pipeline is covered with an insulation layer, which is a glass wool material layer.

7. A heat injection method, comprising: performing heat injection according to a large displacement steam pipeline device of a mobile marine heat injection system according to any one of claims 1 to 6, characterized in that: The heat injection method comprises: The flange interface, the compensating steam pipeline, and the brackets on the compensating steam pipeline are constructed and installed together with the trestle; the flange interface, the fixed end steam pipeline, and the brackets on the fixed end steam pipeline are constructed and installed together with the fixed platform; the flange interface, the mobile end steam pipeline, and the brackets on the mobile end steam pipeline are constructed and installed together with the mobile platform; The trestle is installed on the mobile platform through a rotating device, and after the trestle and its rotating device are installed and debugged on the mobile platform, the rotating device is controlled to rotate the fixed end of the trestle to the fixed platform; Connecting the mobile end steam pipeline to the compensating steam pipeline through a flange interface, connecting the fixed end steam pipeline to the compensating steam pipeline through a flange interface, and after the trestle and the fixed platform are debugged at sea, controlling the boiler to inject heat; After the heat injection is completed, the flanges at both ends of the trestle are removed, and the compensating steam pipeline is controlled to rotate back to the mobile platform together with the trestle.

Images