Riser joint construction, riser and method of use

Abstract

The present application relates to the technical field of oil pipeline, and particularly provides a riser joint structure, a riser and a use method. The structure comprises a first connecting end and a second connecting end. The first connecting end comprises a first connecting plate arranged on a first male joint of a main pipe and a shape memory alloy arranged on a second male joint of an auxiliary pipeline. The second connecting end comprises a first female joint arranged on the main pipe and a second female joint arranged on the auxiliary pipeline. The first connecting plate is provided with a limiting hole for the second male joint to pass through. The second male joint can be sealingly connected with the second female joint. The first male joint and the first female joint can be sealed by a sealing element between the contact surfaces of the first male joint and the first female joint. The first male joint and the first female joint can be connected by a clamping element. The shape memory alloy can be deformed by heating, and can be used to support the first connecting plate. The axial tension of the main pipe is shared by the auxiliary pipeline, and the risk of breakage of the main pipe is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of oil pipeline technology, and in particular to a structure of a riser joint, a riser pipe, and a method of use. Background Technology

[0002] Riser pipes are indispensable equipment in offshore oil and gas exploration and development. They are used to isolate seawater during drilling, protect drill pipes and drill tools, withstand downhole pressure, prevent blowouts and other safety accidents, and ensure the smooth progress of drilling operations. The riser pipe includes the main body and its surrounding auxiliary pipelines such as choke and kill lines, mud booster lines, and hydraulic lines. Its main functions are to control the flow of drilling fluid, maintain downhole pressure balance, increase drilling fluid pressure, and provide power to drilling equipment, thereby ensuring the smooth progress of drilling operations and the stability of the downhole environment.

[0003] The riser joint is a key component connecting the various riser sections. Its function is to ensure that the risers can be tightly and reliably connected to form a continuous pipeline, so as to maintain the integrity and stability of the entire drilling system and prevent the connection from coming apart or breaking under tension. The main pipe is provided with a limiting hole at the riser joint to allow auxiliary pipelines to pass through, ensuring that the auxiliary pipelines are deployed along the axis of the main pipe.

[0004] The riser system, as a vertical pipe suspended from the drilling platform to the seabed wellhead, can weigh hundreds of tons. Combined with dynamic loads such as platform heave and current impact, the riser and its joints must withstand enormous axial tensile forces. While existing technologies have extensively studied the connection stability of riser joints, the axial tensile forces that the main riser must withstand increase with drilling depth, making the risk of breakage significant. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that existing riser pipes may break due to large axial tensile forces, and to provide a riser pipe joint structure, a riser pipe, and a method of use.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, a water-tight pipe joint structure is provided, including a first connecting end and a second connecting end. The first connecting end includes a first connecting plate disposed on a first male connector of a main pipe and a shape memory alloy component disposed on a second male connector of an auxiliary pipeline. The second connecting end includes a first female connector disposed on a main pipe and a second female connector disposed on an auxiliary pipeline. The first connecting plate is provided with a limiting hole for the second male connector to pass through. The second male connector can be sealed to the second female connector. The first male connector and the first female connector can be sealed by a sealing component between their contact surfaces. The first male connector and the first female connector can be connected by a snap-fit ​​component. The shape memory alloy component can deform when heated, thereby supporting the first connecting plate.

[0008] The first male connector, the second male connector, the first female connector, and the second female connector at the joint are connected to two different segments. That is, correspondingly, the two ends of a main pipeline segment are usually connected to the first male connector and the first female connector, and the two ends of an auxiliary pipeline segment are connected to the second male connector and the second female connector, respectively, to connect with the adjacent segments.

[0009] The number and shape of the snap-fit ​​components can be found in the snap-fit ​​designs in the prior art.

[0010] The first male connector and the first female connector are connected by a snap-fit ​​fitting, while the sealing is achieved through a seal between their contact surfaces. The snap-fit ​​fitting, used for connection, does not participate in the sealing, creating a design concept that separates load-bearing and sealing functions. This improves the axial tensile strength, reliability, and connection efficiency of the snap-fit ​​fitting. The shape memory alloy component, after deformation, provides axial support to the first connecting plate, allowing auxiliary pipelines to work together with the main pipe to withstand the axial tensile force of the main pipe. This effectively reduces the risk of main pipe breakage, and the cooperative load-bearing effect of the auxiliary pipelines further enhances with the increase in the number of auxiliary pipelines. Under constant load-bearing capacity, this effectively reduces the wall thickness of the riser main pipe, helping to reduce the overall weight of the riser and thus reducing the axial tensile force on the riser, significantly improving the stability and reliability of the riser.

[0011] The riser connector structure described in this invention utilizes a shape memory alloy component on the second male connector of the auxiliary pipeline. This component, after being deformed by heat, provides axial support to the first connecting plate, sharing the axial tensile force borne by the main pipe and effectively reducing the risk of main pipe breakage. Combined with a snap-fit ​​structure, it achieves the connection between the main pipe and the auxiliary pipeline, ensuring connection accuracy and sealing performance while significantly improving the overall stability and reliability of the riser connection. This design is suitable for suspended riser installations in deep-sea operations, enhancing the overall service life and safety of the riser system and adapting to complex load conditions in marine drilling environments.

[0012] Optionally, the outer wall of the second male connector is provided with an annular groove, and the shape memory alloy part has a C-shaped structure, and the shape memory alloy part is adapted to be installed in the annular groove.

[0013] The installation structure of shape memory alloy parts is simple, requiring no major modifications to the original second male connector structure, making them easy to process, form, and assemble on-site.

[0014] Optionally, the outer wall of the first male connector is provided with a first circumferential groove, and the outer wall of the first female connector is provided with a second circumferential groove. The snap-fit ​​component includes a first protrusion and a second protrusion, which are respectively used to adapt and snap into the first circumferential groove and the second circumferential groove.

[0015] Both the first and second circumferential grooves have side walls. By having two protrusions engage with the corresponding circumferential grooves, the axial positioning of the first male connector and the first female connector can be quickly achieved. The engagement operation is simple, the positioning effect is stable, and the axial tensile strength is strong. After the first and second protrusions are engaged with the two circumferential grooves respectively, the initial positioning of the first male connector and the first female connector can be achieved, providing a stable foundation for subsequent load bearing.

[0016] The side of the first and second protrusions away from the mating surface of the first male or female connector is set as a plane, which can directly abut against the corresponding side wall of the corresponding slot, which is conducive to uniformly transmitting axial tensile force, avoiding stress concentration, and improving safety and reliability.

[0017] Optionally, it may also include a driving component, which is used to drive the latching member to complete the latching or unlocking action.

[0018] Optionally, the back of the snap-fit ​​component is a concave arc surface, and the driving component includes a driving ring. The inner side of the driving ring has a convex arc surface that adapts to the concave arc surface. When the driving ring moves along the axial direction of the main pipe, it can drive the snap-fit ​​component to move radially through the cooperation of the convex arc surface and the concave arc surface, thereby realizing snap-fit ​​or unlocking. The transmission is smooth and reliable, the structure is simple and easy to process, and it is convenient to install several snap-fit ​​components arranged in the circumferential direction in one go.

[0019] Optionally, the first connecting plate is provided with a sleeve on the side facing the opening of the first male connector. The sleeve is used to guide the axial movement of the drive ring, to prevent the drive ring from deviating during the movement, to ensure that the drive ring can accurately drive the snap-fit ​​part to move, and to improve the stability of the docking process.

[0020] Optionally, the contact surfaces of the first male connector and the first female connector have a staggered structure, and the sealing element is located on the inner side of the contact surface. The sealing element has a double conical structure.

[0021] The staggered structure can achieve initial axial positioning during docking and further enhance the sealing effect, ensuring the reliability of the design that separates load-bearing and sealing functions. The double-cone sealing structure can adapt to the slight deformation caused by axial tension, improving the sealing reliability of the main pipe docking.

[0022] Optionally, the first female connector has a second connecting plate, the second connecting plate is provided with a limiting hole for the second female connector to pass through, the second female connector has a boss, the limiting hole of the second connecting plate can engage the boss to complete the axial limiting of the second female connector, the second male connector and the second female connector are plugged into each other, and a sealing ring is provided at the contact surface of the second male connector and the second female connector to ensure the sealing performance of the auxiliary pipeline connection.

[0023] In a second aspect, a water-proof pipe is provided, comprising at least two water-proof pipe segments, wherein two adjacent water-proof pipe segments are connected by a water-proof pipe joint structure as described above.

[0024] The riser pipe described in this invention uses shape memory alloy components to support and distribute the axial tensile force of the main pipe, enabling the riser pipe to withstand greater axial loads, adapt to complex working conditions in marine environments, and achieve higher connection stability and safety.

[0025] Thirdly, a method for using a water-proof pipe is provided, applicable to the aforementioned water-proof pipe joint structure or the aforementioned water-proof pipe, comprising the following steps: S1. Insert the second male connector containing the shape memory alloy part into the limiting hole of the first connecting plate, so that the first connecting end, the second connecting end and the sealing part are in place respectively; S2. Insert the connector to connect the first connection end and the second connection end; S3. Lower the water-proof pipe, and fill it with process fluid through the auxiliary pipeline to heat and deform the shape memory alloy part to support the first connecting plate. S4. The main pipeline shall carry out drilling operations, while the auxiliary pipelines shall be kept full of fluid and pressurized.

[0026] The method of using a riser as described in this invention involves first completing the synchronous connection and positioning of the main pipe and auxiliary pipelines. After lowering, the shape memory alloy component is heated and deformed by the temperature of the process fluid filling the pipeline, automatically forming a support for the first connecting plate. No additional manual intervention is required. During drilling operations, the axial tensile force of the main pipe is gradually distributed automatically. The operation process is simple and suitable for the operation method of lowering and connecting risers section by section. It can effectively reduce the difficulty of operation, improve the operability of joint connection, meet the usage requirements of deep-sea riser suspension operation, effectively reduce the risk of main pipe breakage, and improve the stability of riser connection.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The riser joint structure described in this invention distributes the axial tensile force borne by the main pipe through auxiliary pipelines, avoiding the clamping component bearing all the tensile force alone. Furthermore, by adjusting the position of the sealing component, the sealing function and the load-bearing function are made independent, effectively reducing the risk of main pipe breakage, significantly improving the overall stability and reliability of the riser, reducing the overall weight of the riser, adapting to the suspended arrangement of risers in deep-sea operations, improving the overall service life and safety of the riser system, and adapting to the complex load conditions in the marine drilling environment.

[0028] 2. The riser pipe described in this invention can withstand greater axial loads, adapt to complex working conditions in marine environments, and has higher connection stability and safety.

[0029] 3. The method of using a riser as described in this invention involves first completing the synchronous connection and positioning of the main pipe and auxiliary pipelines. After lowering, the shape memory alloy parts are heated and deformed by the temperature of the process fluid filling the pipeline, automatically forming a support for the first connecting plate. No additional manual intervention is required. During the drilling operation, the axial tensile force of the main pipe is gradually distributed automatically. The operation process is simple and suitable for the operation method of lowering and connecting risers section by section. It can effectively reduce the difficulty of operation, improve the operability of joint connection, meet the usage requirements of deep-sea riser suspension operation, effectively reduce the risk of main pipe breakage, and improve the stability of riser connection. Attached Figure Description

[0030] Figure 1 This is a three-dimensional schematic diagram of a water-proof pipe joint structure; Figure 2 This is a schematic elevation view of a water-proof pipe joint structure; Figure 3 This is a cross-sectional schematic diagram of a water-proof pipe joint structure; Figure 4 This is a schematic diagram of the initial installation state of the shape memory alloy component; Figure 5 This is a schematic diagram of the thermal deformation of a shape memory alloy part; Figure 6 This is a diagram showing the unlocked state of the card connector; Figure 7 This is a cross-sectional view of the snap-fit ​​connector.

[0031] Reference numerals: 1-Main pipe, 2-First male connector, 21-First connecting plate, 3-Drive ring, 4-Snap-fit ​​component, 41-First protrusion, 42-Second protrusion, 5-Seal, 6-First female connector, 61-Second connecting plate, 7-Shape memory alloy component, 8-Second male connector, 9-Sealing ring, 10-Second female connector, 11-Sleeve. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] Unless otherwise specified, the terms indicating orientation or positional relationship appearing in the description of specific embodiments of the present invention are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms of orientation or positional relationship are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and are not intended to indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship, and therefore should not be construed as limiting the present invention.

[0035] Furthermore, the use of terms such as "first" and "second" in terminology is merely for distinguishing descriptions of identical or similar components, and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0036] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set," "install," "connect," "provided with," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0037] Example 1 like Figures 1-3As shown, the water-tight pipe joint structure adopted in this invention includes a first connecting end and a second connecting end. The first connecting end includes a first connecting plate 21 provided on a first male connector 2 of the main pipe 1 and a shape memory alloy part 7 provided on a second male connector 8 of the auxiliary pipeline. The second connecting end includes a first female connector 6 provided on the main pipe 1 and a second female connector 10 provided on the auxiliary pipeline. The first female connector 6 has a second connecting plate 61, and the second connecting plate 61 is provided with a limiting hole for the second female connector 10 to pass through. The second female connector 10 has a boss, and the limiting hole of the second connecting plate 61 can engage the boss. The first connecting plate 21 is provided with a limiting hole for the second male connector 8 to pass through. The second male connector 8 can be sealed to the second female connector 10. The first male connector 2 and the first female connector 6 can be sealed by a sealing member 5 between their contact surfaces. The first male connector 2 and the first female connector 6 can be connected by a snap-fit ​​member 4. The shape memory alloy part 7 can deform when heated, and thus can be used to support the first connecting plate 21.

[0038] Specifically, as in this embodiment, the main pipe 1 can be made of high-strength alloy steel, and a first male connector 2 and a first female connector 6 are welded to both ends of the main pipe 1, respectively. Figures 1-3 This diagram illustrates the male and female connectors of two adjacent riser pipe sections, ensuring the normal delivery of drilling fluid within the main pipe 1. Installed... Figures 1-3 The first male connector 2, located at the lower end of the upper main pipe 1, is cylindrical with a tapered protrusion at the end for initial mating with the first female connector 6, forming a staggered mating surface. The inner side of the staggered mating surface of the first male connector 2 and the first female connector 6 has a sealing element 5. The sealing element 5 can be a metal sealing ring with a double-conical structure (such as RX or BX type), made of specially treated metal, possessing good elasticity and sealing performance, suitable for harsh environments such as high pressure, low temperature, and corrosion. Installed... Figures 1-3 The upper end of the lower main pipe 1 is a first female connector 6, with a concave structure on its end face matching the conical boss of the first male connector 2. The outer wall of the first male connector 2 has a first circumferential groove, and the outer wall of the first female connector 6 has a second circumferential groove. The snap-fit ​​component 4 includes a first protrusion 41 and a second protrusion 42, which are respectively used to fit and snap into the first and second circumferential grooves, enabling the snap-fit ​​component 4 to effectively engage. The number of snap-fit ​​components is determined according to actual needs, such as 8-12, evenly distributed around the circumference of the first male connector 2 to form a segmented structure, and can be made of high-strength alloy steel. The driving component includes an external hydraulic or pneumatic caliper-assisted actuating structure and a driving ring 3. The inner side of the driving ring 3 has a convex arc surface that matches the concave arc surface on the back of the snap-fit ​​component 4. The caliper actuates the driving ring 3 to slide along the concave arc on the back of the snap-fit ​​component 4, pushing the snap-fit ​​component 4 inward through the curved surface, thus achieving a quick connection between the first male connector 2 and the first female connector 6. Figure 3As shown; or it may cause the snap-fit ​​component 4 to detach outward, thereby unlocking the first male connector 2 and the first female connector 6, as shown. Figure 6 As shown. A sleeve 11 is also welded to the side of the first connecting plate 21 facing the opening of the first male connector 2, which is used to limit and guide the movement of the drive ring 3.

[0039] like Figure 7 As shown, the first protrusion 41 of the snap-fit ​​component 4 has a greater embedding depth in the first male connector 2 than the second protrusion 42 has a greater embedding depth in the first female connector 6, the height of the first protrusion 41 is greater than the height of the second protrusion 42, and the surface of the first protrusion 41 facing the second protrusion 42 is an inclined surface. Figure 7 The lower side of the first protrusion 41), the surface of the second protrusion 42 facing the first protrusion 41 is also a slope ( Figure 7 The upper side of the second protrusion 42 is tilted at an angle that is set according to actual needs. The surface of the first protrusion 41 away from the second protrusion 42 is flat and makes planar contact with the corresponding side wall of the first circumferential groove. The surface of the second protrusion 42 away from the first protrusion 41 is also flat. The corresponding side wall of the second circumferential groove is inclined, so that the groove opening size is larger than the groove bottom size, which facilitates the second protrusion 42 to snap on.

[0040] The first connecting plate 21 and the second connecting plate 61 each have a plurality of limiting holes. As in this embodiment, the main pipe 1 is surrounded by at least three auxiliary pipelines. Figures 1-3 The one located at the top is the second male connector 8 for the auxiliary pipeline. Figures 1-3 The second female connector 10 located at the bottom is the auxiliary pipeline. The second male connector 8 and the second female connector 10 are connected by plug-in connection. The inner wall of the second female connector 10 is provided with a sealing groove, and a sealing ring 9 is provided in the sealing groove. It is made of oil-resistant and corrosion-resistant rubber and forms a reliable seal after compression.

[0041] The outer wall of the second male connector 8 has an annular groove. The material of the shape memory alloy part 7 can be selected according to actual needs, such as being made of NiTi shape memory alloy, in the shape of an open ring, and fitted into the annular groove. At room temperature, the outer diameter of the shape memory alloy ring is small, which does not affect the insertion of auxiliary pipelines through the limiting hole. Figure 4 As shown; when the temperature rises and a phase change occurs, the shape memory alloy part 7 expands radially, and its outer diameter is larger than the diameter of the limiting hole of the first connecting plate 21. It axially presses against the bottom surface of the first connecting plate 21 of the first male connector 2, so that the auxiliary pipeline and the main pipe 1 can jointly bear the axial tensile force, as shown. Figure 5 As shown.

[0042] In some alternative embodiments, the positional relationship between the first male connector 2 and the first female connector 6 can be interchanged, and correspondingly, the shape memory alloy part 7 can also be adjusted in position to be used for support.

[0043] In some alternative embodiments, the snap-fit ​​connector may also take other structural forms.

[0044] The riser joint structure described in this invention distributes the axial tensile force borne by the main pipe through auxiliary pipelines, preventing the snap-fit ​​component from bearing all the tensile force alone. Furthermore, by adjusting the position of the sealing component, the sealing function and load-bearing function become independent, eliminating the need for the snap-fit ​​component to be specifically designed for sealing. This effectively reduces the risk of main pipe breakage, ensuring not only connection accuracy and sealing performance but also significantly improving the overall stability and reliability of the riser joint connection, reducing the overall weight of the riser, and adapting to the suspended arrangement of risers in deep-sea operations. This enhances the overall service life and safety of the riser system and adapts to the complex load conditions in marine drilling environments.

[0045] Example 2 like Figures 1-7 As shown, a water-proof pipe includes at least two water-proof pipe segments, and two adjacent water-proof pipe segments are connected by a water-proof pipe joint structure as described in Embodiment 1.

[0046] That is, it includes at least two interconnected riser pipe segments, each riser pipe segment including a main pipe 1 and at least one auxiliary pipe. The main pipe 1 is connected by a first male connector 2 and a first female connector 6, and the auxiliary pipe is connected by a second male connector 8 and a second female connector 10.

[0047] The riser pipe described in this invention can withstand greater axial loads, adapt to complex working conditions in marine environments, and offer higher connection stability and safety.

[0048] Example 3 A method of using a water-proof pipe, applied to a water-proof pipe joint structure as described in Example 1 or a water-proof pipe as described in Example 2, see [link / reference]. Figures 1-7 It includes the following steps: S1. Insert the second male connector 8, which is equipped with the shape memory alloy part 7, into the limiting hole of the first connecting plate 21, so that the first connecting end, the second connecting end and the sealing part 5 are in place respectively; S2. Insert the connector 4 to connect the first connection end and the second connection end; S3. Lower the water-proof pipe, and fill it with process fluid through the auxiliary pipeline to heat and deform the shape memory alloy part 7 to support the first connecting plate 21. S4, the main pipeline 1 carries out drilling operations, while the auxiliary pipelines are kept full of fluid and under pressure.

[0049] Specifically, firstly, the first and second connecting ends that need to be connected are pre-installed. For example, the drive ring 3 is pre-inserted from the lower part of the first male connector 2 and placed inside the sleeve 11, located at the root of the first male connector 2, in the unlocked position; the snap-fit ​​part 4 is circumferentially installed in the first circumferential slot of the first male connector 2, and is limited by the drive ring 3, in the open state (unlocked state); the auxiliary pipelines have been inserted or placed in the predetermined positions through the holes around the first connecting plate 21 and the second connecting plate 61 respectively; the shape memory alloy part 7 is pre-installed in the annular groove of the second male connector 8 of the auxiliary pipeline; and the O-ring seal 9 is located in the groove of the second female connector 10.

[0050] The first male connector 2 and the first female connector 6 are initially aligned so that their end faces contact, and the sealing element 5 is pre-placed at the contact position. The driving component drives the driving ring 3 downward, pushing all the snap-fit ​​parts 4 to tighten radially. The second protrusion 42 is embedded into the second circumferential groove of the first female connector 6 to form a mechanical interlock, while simultaneously pressing the sealing element 5. At this time, the second male connector 8 also synchronously completes the insertion and sealing with the second female connector 10, realizing the synchronous connection between the main pipe 1 and the auxiliary pipeline.

[0051] After the water-tight pipe is lowered to the underwater working position, the auxiliary pipeline is first filled with process fluid, vented, pressure tested, and pressure stabilized to keep it full, air-free, and unblocked. Continuous circulation is not performed; it is simply kept statically full and pressure ready. The filled process fluid causes the shape memory alloy part 7 to undergo shape memory deformation when heated. The deformed shape memory alloy part 7 expands radially, with its outer diameter larger than the diameter of the limiting hole in the first connecting plate 21. Ultimately, it is supported on the bottom surface of the first connecting plate 21, providing axial support force to the first connecting plate 21, thereby sharing the axial tensile force borne by the main pipe.

[0052] The main pump 1 first circulates at a low flow rate to establish a return flow from the wellhead to the riser and then to the platform. Then, the flow rate is gradually increased, and the pump is started to begin drilling operations. Auxiliary pipelines are kept full of fluid and under pressure to maintain the expansion of the shape memory alloy component 7. After the process fluid is shut off, the shape memory alloy component 7 contracts.

[0053] The process fluids for auxiliary pipelines are selected according to the corresponding functions of the auxiliary pipelines, such as drilling fluid and hydraulic oil.

[0054] The method of using a riser as described in this invention involves first completing the synchronous connection of the main pipe and auxiliary pipelines. After the riser is lowered into the deep-sea environment, the temperature of the corresponding process fluid in the auxiliary pipeline causes the shape memory alloy component to deform under heat, automatically forming a support for the first connecting plate. This method can gradually strengthen the load-bearing structure during deep-sea operations, achieving the distribution of axial tensile force on the main pipe without additional heating. The connection operation is simple, the load-bearing structure can automatically adapt, and the reliability is high. It meets the usage requirements of deep-sea riser suspension operations, effectively reducing the risk of main pipe breakage and improving the stability of the riser connection.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-proof pipe joint structure, characterized in that, The device includes a first connecting end and a second connecting end. The first connecting end includes a first connecting plate (21) on a first male connector (2) of the main pipe (1) and a shape memory alloy part (7) on a second male connector (8) of the auxiliary pipeline. The second connecting end includes a first female connector (6) on the main pipe (1) and a second female connector (10) on the auxiliary pipeline. The first connecting plate (21) has a limiting hole for the second male connector (8) to pass through. The second male connector (8) can be sealed to the second female connector (10). The first male connector (2) and the first female connector (6) can be sealed by a sealing part (5) between their contact surfaces. The first male connector (2) and the first female connector (6) can be connected by a snap-fit ​​part (4). The shape memory alloy part (7) can be deformed by heat and can be used to support the first connecting plate (21).

2. The structure of a water-proof pipe joint according to claim 1, characterized in that, The outer wall of the second male connector (8) is provided with an annular groove, and the shape memory alloy part (7) is a C-shaped structure, and the shape memory alloy part (7) is disposed in the annular groove.

3. The structure of a water-tight pipe joint according to claim 1, characterized in that, The outer wall of the first male connector (2) is provided with a first circumferential groove, and the outer wall of the first female connector (6) is provided with a second circumferential groove. The snap-fit ​​component (4) includes a first protrusion (41) and a second protrusion (42). The first protrusion (41) and the second protrusion (42) are respectively used to adapt and snap-fit ​​the first circumferential groove and the second circumferential groove.

4. The structure of a water-proof pipe joint according to claim 3, characterized in that, It also includes a driving component, which is used to drive the latch (4) to latch or unlock.

5. The structure of a water-proof pipe joint according to claim 4, characterized in that, The back of the snap-fit ​​component (4) is a concave arc surface. The driving component includes a driving ring (3). The inner side of the driving ring (3) has a convex arc surface that adapts to the concave arc surface. The driving ring (3) can drive the snap-fit ​​component (4) to snap or unlock by moving along the axial direction of the main pipe (1).

6. The structure of a water-proof pipe joint according to claim 5, characterized in that, The first connecting plate (21) is provided with a sleeve (11) on the side facing the opening of the first male connector (2), and the sleeve (11) is used to guide the movement of the drive ring (3).

7. A water-tight pipe joint structure according to any one of claims 1-6, characterized in that, The contact surfaces of the first male connector (2) and the first female connector (6) are staggered, and the sealing element (5) is located on the inner side of the contact surface. The sealing element (5) has a double conical structure.

8. The structure of a water-proof pipe joint according to claim 7, characterized in that, The first female connector (6) has a second connecting plate (61), the second connecting plate (61) is provided with a limiting hole for the second female connector (10) to pass through, the second female connector (10) has a boss, the limiting hole of the second connecting plate (61) can engage the boss, the second male connector (8) and the second female connector (10) are plugged into each other, and a sealing ring (9) is provided at the contact surface of the second male connector (8) and the second female connector (10).

9. A water-resistant pipe, characterized in that, It includes at least two riser pipe segments, and two adjacent riser pipe segments are connected by a riser pipe joint structure as described in any one of claims 1-8.

10. A method of using a water-resistant pipe, characterized in that, The application of a water-tight pipe joint structure as described in any one of claims 1-8 or a water-tight pipe as described in claim 9 includes the following steps: S1. Insert the second male connector (8) containing the shape memory alloy part (7) into the limiting hole of the first connecting plate (21) so that the first connecting end, the second connecting end and the sealing part (5) are in place respectively. S2. Insert the card connector (4) to connect the first connection end and the second connection end; S3. Lower the water-proof pipe and fill it with process fluid through the auxiliary pipeline to heat and deform the shape memory alloy part (7) to support the first connecting plate (21). S4. The main pipeline (1) carries out drilling operations, while the auxiliary pipelines are kept full of liquid and under pressure.

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