A riser extension device for offshore drilling with in-situ replaceable seals

Abstract

The present application relates to riser telescoping technical field, specifically to a kind of in-situ replacement sealable riser telescoping device for offshore drilling, including the inner tube and outer tube that can slide to each other, multiple sealing bags are arranged on the outer tube, flange plate is arranged on the upper and lower sides of each sealing bag, when the skeleton moves upward, elastic sealing sleeve can be taken out upward together, simultaneously, through the effect of trapezoidal retaining ring, elastic driving sleeve can be taken out together stably, it is convenient to replace elastic sealing sleeve.Simultaneously when installing downward, by opening water gap, it can make the seawater between them flow into the bottom of inner grommet along water gap, finally along water outlet is discharged, the whole process can automatically discharge seawater, and avoid the difficulty of complete installation due to the obstruction of seawater when installing.And by setting water outlet two, when air inlet pipe supplies air to it, seawater can be squeezed out along water outlet two.

Description

Technical Field

[0001] This invention relates to the field of riser expansion technology, and more specifically to a riser expansion device for marine drilling with a replaceable seal in place. Background Technology

[0002] One component of the riser in offshore drilling is the expansion joint, also known as the expansion device. This expansion device allows the inner and outer edges to slide against each other to accommodate the constantly changing positions between the platform wellhead and the subsea wellhead.

[0003] The expansion joint is equipped with multiple sealing packs, which can operate individually or in combination. The sealing packs create a seal by compressing the elastic sealing sleeve against the inner pipe to prevent seawater from contacting the marine oil inside the pipeline. However, with prolonged use, the seals of some of these packs may fail. If all sealing packs fail, the expansion joint must be disassembled and replaced. Due to the large size of the expansion joint, the replacement process takes a considerable amount of time.

[0004] Therefore, there is a need to design a riser expansion joint with replaceable seals for marine drilling, capable of replacing the elastic sealing sleeve to avoid replacing the entire expansion joint. Chinese patent application number CN201820135732.5 discloses the idea of ​​a replaceable elastic sealing sleeve, but if the elastic sealing sleeve adopts a ring structure, it can be cut with a cutting device during disassembly, but installation is difficult, as it is hard to fit the ring structure onto the outer edge of the inner tube. Furthermore, using seawater for replacement results in some seawater not being completely squeezed out during the replacement and insertion process, making complete insertion difficult due to seawater obstruction, requiring the removal of the obstructing seawater.

[0005] Furthermore, since the elastic sealing sleeve is often made of rubber, when the elastic sealing sleeve is pulled out upwards, the elastic driving sleeve needs to be pulled up as well. If it cannot be pulled up, then when the elastic sealing sleeve is inserted, the friction between the elastic driving sleeve and the elastic sealing sleeve will make it difficult to push the elastic sealing sleeve downwards for installation.

[0006] It should be noted that the elastic sealing sleeve is compressed by continuously introducing high-pressure gas or high-pressure oil. Since multiple sealing sleeves often use a single channel to inject high-pressure gas, when replacing one of the sealing sleeves, the corresponding channel needs to be branched off and closed.

[0007] Therefore, it is necessary to design a riser expansion device for marine drilling with replaceable seals in place, which can facilitate the replacement of elastic sealing sleeves. At the same time, when the elastic sealing sleeve is pulled upward, the elastic drive sleeve can be pulled out synchronously. When it is inserted downward for installation, seawater can be automatically discharged. Before replacement, the channel can be closed by corresponding channel branching. Summary of the Invention

[0008] To address the aforementioned technical shortcomings, the present invention aims to provide a riser expansion device for marine drilling with replaceable seals in place. This device facilitates the replacement of the elastic sealing sleeve, and simultaneously pulls out the elastic drive sleeve when the elastic sealing sleeve is pulled upward. Furthermore, it automatically discharges seawater during downward insertion and can close the corresponding channel branch before replacement.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a riser expansion device for marine drilling with replaceable seals in place, comprising an inner tube and an outer tube that can slide relative to each other. Multiple sealing packages are provided on the outer tube. Flanges are provided on both the upper and lower sides of each sealing package. Each sealing package includes an elastic drive sleeve, an elastic sealing sleeve, a skeleton, a bushing, and an outer tube sleeve. The two ends of the outer tube sleeve are detachably connected to the flanges. The bushing, elastic drive sleeve, and elastic sealing sleeve are sequentially fitted inside the outer tube. The elastic drive sleeve and elastic sealing sleeve are engaged with the skeleton. The flange abuts against the top of the skeleton. The elastic drive sleeve and elastic sealing sleeve are composed of multiple arc-shaped elastic drive sleeves and elastic sealing sleeves.

[0010] Preferably, the frame includes two vertical rods, two inner gaskets, and two outer gaskets. The inner gaskets are fixedly installed at the upper and lower ends of the two vertical rods, and the two outer gaskets are located at the upper and lower ends of the two outer gaskets, respectively. The outer edges of the two vertical rods are in contact with the inner sides of the two outer gaskets. The elastic sealing sleeve includes two arc-shaped sealing sleeves, the two ends of which are respectively fitted with the two vertical rods. The elastic driving sleeve is wrapped around the outer edge of the elastic sealing sleeve, and the two ends of the elastic driving sleeve are fitted with the two vertical rods.

[0011] Preferably, the inward-facing ends of the two vertical rods have a pointed structure.

[0012] Preferably, an annular groove is provided between the outer tube sleeve and the bushing, and multiple rows of extrusion holes are provided on the bushing, which connect the annular groove and the outer wall of the elastic drive sleeve. The multiple rows of extrusion holes are evenly distributed along the circumference of the bushing, and an air inlet pipe connected to the annular groove is provided on the outer edge of the outer tube sleeve.

[0013] Preferably, the flange has a first outlet connected to the bottom of the inner gasket ring located in the lower layer, the outer edge of the outer sleeve has a second outlet connected to the annular groove, and the outer gasket ring located in the lower layer has a water outlet notch.

[0014] Preferably, the inner pad ring located below is provided with a plurality of trapezoidal retaining rings. The inner pad ring is provided with a receiving groove for the trapezoidal retaining rings to be received. The inner pad ring is provided with an elastic seat for pushing the trapezoidal retaining rings toward the outer pad ring. The inclined surface of the trapezoidal retaining ring is located on the side below near the water outlet. One side of the trapezoidal retaining ring is in contact with the bottom of the elastic drive sleeve.

[0015] Preferably, the elastic seat includes a spring, a guide post, and a limiting ring. The guide post is horizontally slidably installed inside the inner pad ring. A guide hole is provided in the inner pad ring for the guide post to slide horizontally. One end of the guide post is fixedly connected to the trapezoidal retaining ring, and the other end of the guide post is fixedly connected to the limiting ring. The spring is used to apply an elastic force to the trapezoidal retaining ring near the water outlet.

[0016] Preferably, multiple sealing packages located in the middle are provided with communicating vessels. Each communicating vessel includes an insert, a sleeve, a gas guide block, a horizontal puller, and a straight pipe. The insert and sleeve are fixedly installed on the upper and lower sides of the straight pipe and are connected to the straight pipe. The gas guide block is inserted in the middle of the straight pipe. The horizontal puller is fixedly installed on the outer edge of the sleeve. The horizontal puller is used to pull the gas guide block to move horizontally and switch positions. The gas guide block has a gas guide bend and a gas guide straight channel. The insert of the lower communicating vessel is inserted into the sleeve of the upper communicating vessel. The side of the uppermost sealing package is provided with a bend that connects to the air inlet pipe, and the insert of the topmost communicating vessel is inserted into the bend.

[0017] Preferably, a screw is fixedly installed on the top of the outer sleeve, and a guide plate is provided on the flange for the screw to be inserted. A nut is engaged on the outer edge of the screw, and the nut abuts against the top of the guide plate.

[0018] The beneficial effects of this invention are as follows: When the frame moves upward, the elastic sealing sleeve is carried upward along with it. Simultaneously, the trapezoidal retaining ring stably carries the elastic driving sleeve out as well, facilitating the replacement of the elastic sealing sleeve. Furthermore, during downward installation, the water outlet allows seawater to flow along the outlet to the bottom of the inner gasket ring, and finally discharge through the first outlet. This automatic drainage process prevents seawater from obstructing the insertion process. Additionally, the second outlet allows seawater to be squeezed out when air is supplied through the air inlet pipe.

[0019] Before replacement, pull the lower air guide block horizontally outward to disconnect the straight air guide channel that was originally connected to the insertion tube and the sleeve. At the same time, the air guide bend is connected to the sleeve, allowing high-pressure gas to be supplied to the sealing package. This seals the connection between the inner and outer tubes, enabling the channel to be closed by corresponding branching before replacement, while still allowing gas to be supplied to the lower sealing package to enable it to work. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a top view of the present invention.

[0022] Figure 2 for Figure 1 A cross-sectional view along line AA.

[0023] Figure 3 for Figure 2 A magnified view of section B.

[0024] Figure 4 This is a partial three-dimensional structural exploded view of the present invention.

[0025] Figure 5 This is a top view of the installation of the vertical rod.

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the inner gasket ring.

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the outer gasket ring.

[0028] Figure 8 for Figure 3 A magnified view of a portion of point D.

[0029] Figure 9 for Figure 2 A magnified view of a portion of point C.

[0030] Figure 10 This is a schematic diagram of the three-dimensional structure of the screw.

[0031] Explanation of reference numerals in the attached drawings: 1. Inner tube; 2. Outer tube; 3. Trapezoidal retaining ring; 4. Sealing package; 4a. Elastic drive sleeve; 4b. Elastic sealing sleeve; 4c. Skeleton; 4c1. Vertical rod; 4c2. Inner gasket ring; 4c3. Outer gasket ring; 4d. Bushing; 4e. Outer tube sleeve; 4f. Annular groove; 4h. Extrusion hole; 4j. Air inlet pipe; 4s. Water outlet two; 4k. Water outlet notch; 5. Connecting flange; 5a. Water outlet one; 6. Screw; 7. Elastic seat; 7a. Spring; 7b. Guide post; 7c. Limiting ring; 8. Communicating device; 8a. Inserted tube; 8b. Sleeve; 8c. Air guide block; 8c1. Air guide bend; 8c2. Air guide straight channel; 8d. Horizontal puller; 8e. Straight tube. Detailed Implementation

[0032] 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.

[0033] Example: This invention provides a riser expansion joint with replaceable seal in place for marine drilling, such as... Figure 1-10 As shown, the device includes an inner tube 1 and an outer tube 2 that can slide relative to each other. Multiple sealing sleeves 4 are provided on the outer tube 2. Each sealing sleeve 4 has a flange 5 on both its upper and lower sides. Each sealing sleeve 4 includes an elastic drive sleeve 4a, an elastic sealing sleeve 4b, a frame 4c, a bushing 4d, and an outer tube sleeve 4e. The two ends of the outer tube sleeve 4e are detachably connected to the flange 5. The bushing 4d, elastic drive sleeve 4a, and elastic sealing sleeve 4b are sequentially fitted inside the 4c. The elastic drive sleeve 4a and elastic sealing sleeve 4b are engaged with the frame 4c. The flange 5 abuts against the top of the frame 4c. The elastic drive sleeve 4a and elastic sealing sleeve 4b are composed of multiple arc-shaped elastic drive sleeves 4a and elastic sealing sleeves 4b. When it is necessary to replace the elastic sealing sleeve 4b, the flange 5 is disassembled from the outer tube sleeve 4e, and the flange 5 is lifted upwards. Finally, the frame 4c is lifted upwards, causing the elastic drive sleeve 4a and elastic sealing sleeve 4b to move upwards along with it. After the rise, the arc-shaped elastic drive sleeve 4a and elastic sealing sleeve 4b can be removed from the side. After replacing the elastic sealing sleeve 4b, the elastic drive sleeve 4a and elastic sealing sleeve 4b are installed and inserted into the bushing 4d.

[0034] The frame 4c includes two vertical rods 4c1, two inner gaskets 4c2, and two outer gaskets 4c3. The inner gaskets 4c2 are fixedly installed at the upper and lower ends of the two vertical rods 4c1, and the two outer gaskets 4c3 are located at the upper and lower ends of the two outer gaskets 4c3, respectively. The outer edges of the two vertical rods 4c1 contact the inner sides of the two outer gaskets 4c3. The elastic sealing sleeve 4b includes two arc-shaped sealing sleeves, with both ends of the elastic sealing sleeve 4b fitting against the two vertical rods 4c1. The elastic driving sleeve 4a wraps around the outer edge of the elastic sealing sleeve 4b, with both ends of the elastic driving sleeve 4a fitting against the two vertical rods 4c1. When the frame 4c is pulled out, the elastic driving sleeve 4a and the elastic sealing sleeve 4b will be pulled out simultaneously. Subsequently, by removing the elastic driving sleeve 4a, the elastic sealing sleeve 4b can be removed and replaced. When the inner pad ring 4c2 is pulled upward, the vertical rod 4c1 and the inner pad ring 4c2 are lifted upward together. The vertical rod 4c1 abuts against the outer pad ring 4c3 located on the upper layer, which is also lifted upward. This allows the elastic drive sleeve 4a located below the outer pad ring 4c3 to move upward without obstruction. After installation, the outer pad ring 4c3 can be automatically inserted along with the inner pad ring 4c2.

[0035] The two vertical rods 4c1 have a pointed end facing inwards. This pointed end ensures that the elastic sealing sleeve 4b is as wide as possible near the inside. This prevents gaps from forming because the sleeve cannot completely wrap around the outer edge of the inner tube 1 when pressed against it.

[0036] An annular groove 4f is formed between the outer sleeve 4e and the bushing 4d. Multiple rows of extrusion holes 4h are formed on the bushing 4d, connecting the annular groove 4f and the outer wall of the elastic drive sleeve 4a. These extrusion holes 4h are evenly distributed along the circumference of the bushing 4d. An air inlet pipe 4j, connected to the annular groove 4f, is provided on the outer edge of the outer sleeve 4e. The number of extrusion holes 4h in each row is not fixed, but there are at least four. High-pressure gas supplied through the air inlet pipe 4j passes through the annular groove 4f and the extrusion holes 4h, applying inward pressure to the elastic drive sleeve 4a, thus causing the elastic drive sleeve 4a to compress the elastic sealing sleeve 4b inward.

[0037] The flange 5 has a water outlet 5a, which connects to the bottom of the inner gasket 4c2 located in the lower layer. The outer sleeve 4e has a water outlet 4s on its outer edge, which connects to the annular groove 4f. The outer gasket 4c3 located in the lower layer has a water outlet notch 4k. During installation, seawater in the middle of the bushing 4d is squeezed out along the water outlet 5a. In the final stage, the outer edge of the lower inner gasket 4c2 fits against the inner edge of the outer gasket 4c3. At this point, the seawater stored between the bottom of the elastic drive sleeve 4a and the outer gasket 4c3 cannot be discharged. However, by opening the water outlet notch 4k, the seawater between them can flow into the bottom of the inner gasket 4c2 along the notch 4k and finally discharge along the water outlet 5a. The entire process automatically discharges seawater and avoids difficulties in complete installation due to seawater obstruction.

[0038] Furthermore, by setting out outlet 2 4s, when air is supplied to it by air inlet pipe 4j, seawater can be squeezed out along outlet 2 4s.

[0039] Multiple trapezoidal retaining rings 3 are disposed within the lower inner gasket ring 4c2. The inner gasket ring 4c2 has a receiving groove for the trapezoidal retaining rings 3 to retract. An elastic seat 7 is also provided on the inner gasket ring 4c2 to push the trapezoidal retaining rings 3 towards the outer gasket ring 4c3. The inclined surface of the trapezoidal retaining ring 3 is located on the lower side near the water outlet 4k, and one side of the trapezoidal retaining ring 3 contacts the bottom of the elastic drive sleeve 4a. When the frame 4c is pulled upwards, the trapezoidal retaining rings 3 contact the bottom of the elastic drive sleeve 4a, allowing the multiple trapezoidal retaining rings 3 to simultaneously pull the elastic drive sleeve 4a upwards. In other words, when the elastic sealing sleeve is pulled upwards, the elastic drive sleeve is synchronously pulled out.

[0040] To prevent the trapezoidal retaining ring 3 from blocking the water outlet 4k during descent, thus preventing seawater from being discharged, the water outlet 4k and the trapezoidal retaining ring 3 are misaligned during descent. As the trapezoidal retaining ring 3 descends, its inclined surface contacts the inner edge of the outer pad ring 4c3, causing the trapezoidal retaining ring 3 to be compressed and retract into the guide groove. After descent, it is rotated so that the trapezoidal retaining ring 3 can be engaged in the water outlet 4k, ensuring that the elastic drive sleeve 4a can move upward together during the upward lifting process.

[0041] The elastic seat 7 includes a spring 7a, a guide post 7b, and a limiting ring 7c. The guide post 7b is horizontally slidable within the inner gasket ring 4c2. A guide hole is formed within the inner gasket ring 4c2 for the horizontal sliding of the guide post 7b. One end of the guide post 7b is fixedly connected to the trapezoidal retaining ring 3, and the other end is fixedly connected to the limiting ring 7c. The spring 7a applies an elastic force to the trapezoidal retaining ring 3 near the outlet notch 4k. When the outlet notch 4k abuts against the outer gasket ring 4c3, the trapezoidal retaining ring 3 pushes the spring 7a to be compressed, allowing the trapezoidal retaining ring 3 to retract into the receiving groove. The guide post 7b provides guidance for the movement of the trapezoidal retaining ring 3.

[0042] Multiple sealing packages 4 located in the middle section are equipped with communicating vessels 8. Each communicating vessel 8 includes an insert tube 8a, a sleeve 8b, a gas guide block 8c, a horizontal puller 8d, and a straight pipe 8e. The insert tube 8a and sleeve 8b are fixedly installed on the upper and lower sides of the straight pipe 8e respectively and are connected to the straight pipe 8e. The gas guide block 8c is inserted in the middle of the straight pipe 8e. The horizontal puller 8d is fixedly installed on the outer edge of the sleeve 8b and is used to pull the gas guide block 8c to move horizontally and switch positions. The gas guide block 8c has a gas guide bend 8c1 and a gas guide straight channel 8c2. The insert tube 8a of the lower communicating vessel 8 is inserted into the sleeve 8b of the upper communicating vessel 8. The side of the uppermost sealing package 4 is provided with a bend that connects to the air inlet pipe 4j, and the insert tube 8a of the topmost communicating vessel 8 is inserted into the bend. The sleeve 8b of the bottommost communicating vessel 8 is connected to the gas supply equipment. By employing a sliding structure between the insertion tube 8a and the sleeve 8b, the sealing package 4 can be easily pulled out and separated during disassembly, making replacement easier. When the elastic sealing sleeve 4b inside the upper sealing package 4 needs to be replaced, the air guide block 8c located below it needs to be pulled horizontally outward. This disconnects the air guide straight channel 8c2, which was originally connected to the insertion tube 8a and the sleeve 8b, and simultaneously establishes a connection between the air guide bend 8c1 and the sleeve 8b, allowing high-pressure gas to be supplied to the sealing package 4. This seals the connection between the inner tube 1 and the outer tube 2, enabling the channel to be closed by corresponding branching before replacement, while still allowing gas to be supplied to the lower sealing package 4 for operation. When not undergoing maintenance, multiple sealing packages 4 are tightly sealed together with the top sealing package 4. That is, there can be at least two sealing packages 4. The air guide block 8c is pulled outward by a horizontal puller 8d.

[0043] A screw 6 is fixedly installed on the top of the outer sleeve 4e. The flange 5 is provided with a guide plate for the screw 6 to be inserted. A nut is engaged on the outer edge of the screw 6, and the nut abuts against the top of the guide plate. The screw 6 guides the vertical movement of the flange 5.

[0044] In use, when it is necessary to replace the elastic sealing sleeve 4b, the flange 5 is disassembled from the outer sleeve 4e, and the flange 5 is lifted downwards. Finally, the skeleton 4c is lifted upwards, causing the elastic drive sleeve 4a and the elastic sealing sleeve 4b to move upwards together. After rising, the arc-shaped elastic drive sleeve 4a and the elastic sealing sleeve 4b can be removed from the side. After replacing the elastic sealing sleeve 4b, the elastic drive sleeve 4a and the elastic sealing sleeve 4b are installed and inserted into the bushing 4d.

[0045] After replacement, the bushing is inserted downwards. During the insertion process, the seawater in the middle of the bushing 4d will be squeezed out along the outlet 5a. In the final stage, the outer edge of the inner ring 4c2 located below will fit with the inner edge of the outer ring 4c3. By opening the outlet gap 4k, the seawater between them can flow into the bottom of the inner ring 4c2 along the outlet gap 4k and finally be discharged along the outlet 5a.

[0046] In the final stage of insertion, the elastic seat 7 will be compressed, and then the trapezoidal retaining ring 3 will be inserted into the water outlet 4k by rotating the frame 4c.

[0047] When the skeleton 4c moves upward, it can bring the elastic sealing sleeve 4b upward along with it. At the same time, through the action of the trapezoidal retaining ring 3, it can stably bring out the elastic driving sleeve 4a as well, making it easy to replace the elastic sealing sleeve. Simultaneously, during downward installation, by opening the water outlet 4k, seawater can flow along the outlet 4k to the bottom of the inner gasket ring 4c2, and finally be discharged through the outlet 5a. The entire process automatically discharges seawater and avoids difficulties in complete installation due to seawater obstruction. Furthermore, by setting the outlet 4s, when air is supplied through the air inlet pipe 4j, seawater can be squeezed out through the outlet 4s.

[0048] Before replacement, pull the lower air guide block 8c horizontally outward to disconnect the air guide straight channel 8c2, which was originally connected to the insertion tube 8a and the sleeve 8b. At the same time, the air guide bend 8c1 is connected to the sleeve 8b, so that high-pressure gas can be supplied to the sealing package 4. This allows the sealing package 4 to seal the connection between the inner tube 1 and the outer tube 2. In other words, before replacement, the channel can be closed by corresponding channel branching, and air can still be supplied to the lower sealing package 4 to enable it to work.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A riser expansion joint with replaceable seal for marine drilling, characterized in that, The device includes an inner tube (1) and an outer tube (2) that can slide against each other. The outer tube (2) is provided with multiple sealing packages (4). Each sealing package (4) has a flange (5) on both the upper and lower sides. Each sealing package (4) includes an elastic drive sleeve (4a), an elastic sealing sleeve (4b), a skeleton (4c), a bushing (4d), and an outer tube sleeve (4e). The two ends of the outer tube sleeve (4e) are detachably connected to the flange (5). The bushing (4d), the elastic drive sleeve (4a), and the elastic sealing sleeve (4b) are sequentially fitted inside the 4c. The elastic drive sleeve (4a) and the elastic sealing sleeve (4b) are engaged with the skeleton. On (4c), the flange (5) abuts against the top of the frame (4c), the elastic drive sleeve (4a) is composed of two arc-shaped elastic drive sleeves, and the elastic sealing sleeve (4b) is composed of two arc-shaped sealing sleeves; an annular groove (4f) is provided between the outer sleeve (4e) and the bushing (4d), and multiple rows of extrusion holes (4h) connecting the annular groove (4f) and the outer wall of the elastic drive sleeve (4a) are provided on the bushing (4d). The multiple rows of extrusion holes (4h) are evenly distributed along the circumference of the bushing (4d), and an air inlet pipe (4j) connected to the annular groove (4f) is provided on the outer edge of the outer sleeve (4e). The frame (4c) includes two vertical rods (4c1), two inner gaskets (4c2), and two outer gaskets (4c3). The inner gaskets (4c2) are fixedly installed at the upper and lower ends of the two vertical rods (4c1). The two outer gaskets (4c3) are located at the upper and lower ends of the two outer gaskets (4c3), respectively. The outer edges of the two vertical rods (4c1) are in contact with the inner sides of the two outer gaskets (4c3). The two ends of the elastic sealing sleeve (4b) are respectively fitted with the two vertical rods (4c1). The elastic driving sleeve (4a) is wrapped around the outer edge of the elastic sealing sleeve (4b), and the two ends of the elastic driving sleeve (4a) are fitted with the two vertical rods (4c1). A water outlet 1 (5a) is provided on the flange (5), which is connected to the bottom of the inner gasket ring (4c2) located in the lower layer. A water outlet 2 (4s) is provided on the outer edge of the outer sleeve (4e), which is connected to the annular groove (4f). A water outlet notch (4k) is provided on the outer gasket ring (4c3) located in the lower layer. Multiple trapezoidal retaining rings (3) are provided inside the inner pad ring (4c2) located below. The inner pad ring (4c2) has a receiving groove for the trapezoidal retaining rings (3) to be received. The inner pad ring (4c2) has an elastic seat (7) for pushing the trapezoidal retaining rings (3) toward the outer pad ring (4c3). The inclined surface of the trapezoidal retaining ring (3) is located on the side near the water outlet (4k) below. One side of the trapezoidal retaining ring (3) is in contact with the bottom of the elastic drive sleeve (4a).

2. The in-situ replaceable seal riser expansion joint for marine drilling as described in claim 1, characterized in that, The two vertical bars (4c1) have a pointed end facing inwards.

3. The in-situ replaceable seal riser expansion joint for marine drilling as described in claim 1, characterized in that, The elastic seat (7) includes a spring (7a), a guide post (7b) and a limiting ring (7c). The guide post (7b) is horizontally slidably installed in the inner pad ring (4c2). The inner pad ring (4c2) has a guide hole for the guide post (7b) to slide horizontally. One end of the guide post (7b) is fixedly connected to the trapezoidal retaining ring (3), and the other end of the guide post (7b) is fixedly connected to the limiting ring (7c). The spring (7a) is used to apply an elastic force to the trapezoidal retaining ring (3) close to the water outlet (4k).

4. The in-situ replaceable seal riser expansion joint for marine drilling as described in claim 1, characterized in that, Multiple sealing packages (4) located in the middle section are equipped with communicating vessels (8). Each communicating vessel (8) includes an insert (8a), a sleeve (8b), a vent block (8c), a horizontal puller (8d), and a straight pipe (8e). The insert (8a) and sleeve (8b) are fixedly installed on the upper and lower sides of the straight pipe (8e) and are connected to the straight pipe (8e). The vent block (8c) is inserted in the middle of the straight pipe (8e), and the horizontal puller (8d) is fixedly installed on the sleeve (8b). The outer edge of the air guide block (8c) is used to pull the air guide block (8c) to move horizontally to switch positions. The air guide block (8c) is provided with an air guide bend (8c1) and an air guide straight channel (8c2). The tube (8a) of the lower communicating vessel (8) is inserted into the sleeve (8b) of the upper communicating vessel (8). The side of the sealing package (4) at the top layer is provided with a bend connected to the air inlet pipe (4j), and the tube (8a) of the top communicating vessel (8) is inserted into the bend.

5. A riser expansion joint with replaceable seal for marine drilling as described in claim 1, characterized in that, A screw (6) is fixedly installed on the top of the outer sleeve (4e), and a guide plate is provided on the flange (5) for the screw (6) to be inserted. A nut is engaged on the outer edge of the screw (6), and the nut abuts against the top of the guide plate.

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