Drill pipe centralizer apparatus and method for subsea drilling in situ

Abstract

The application discloses a drill rod centering device and method for seabed in-situ drilling, which comprises a pair of fixed frame rods arranged side by side, and a swing arm located in a horizontal plane is rotationally connected to each side of the two fixed frame rods close to each other, and a semicircular clamp shoe is fixedly connected to the free end of the swing arm, a hydraulic cylinder is connected between the outer wall of the clamp shoe and the fixed frame rod on the same side, the openings of the two clamp shoes are opposite to each other and can be combined to form a cylindrical clamp coaxial with a wellhead, and a conical guide ring is formed at the top end of the clamp and outwardly flared. In the process of drilling by the seabed drilling machine, the working space is limited, so when the drill rod butt joint operation is performed, the hydraulic cylinder is elongated to drive the swing arm to make the clamp shoe reach the center position of the wellhead and form a clamp for clamping the lower drill rod, and the upper drill rod is then lowered to the vertical plane of the clamp through the inclined surface of the guide ring, so that the upper and lower drill rods are located at the same center, and the situation that the drill rods cannot be centered and the connection process may damage the buckle type is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of equipment for offshore oil and gas field exploration and development, specifically relating to a drill pipe alignment device for in-situ subsea drilling. This invention also relates to a drill pipe alignment method for in-situ subsea drilling. Background Technology

[0002] In the exploration and development of offshore oil and gas fields, drilling depths of thousands or even tens of thousands of meters are required. The ability to quickly and efficiently connect drill pipes during the drilling string setup process is crucial to drilling efficiency. To address the issue of rapid drill pipe connection, a device is needed to ensure that the centers of the male and female threads of two drill pipe sections are aligned on a central line during connection. Existing adjustment mechanisms cannot meet the drill pipe alignment requirements in offshore (submarine) drilling. Therefore, there is an urgent need to develop a drill pipe alignment device for in-situ submarine drilling to fulfill the requirements of related operations. Summary of the Invention

[0003] The purpose of this invention is to provide a drill pipe alignment device for in-situ subsea drilling, which solves the problem of drill pipe connection misalignment during subsea drilling, leading to damage to the threaded connection during the threading process.

[0004] Another object of the present invention is to provide a drill pipe alignment method for in-situ subsea drilling.

[0005] The first technical solution adopted in this invention is: a drill pipe centering device for in-situ drilling on the seabed, comprising a pair of fixed frame rods arranged in parallel, with a swing arm located in the horizontal plane rotatably connected to the side of the two fixed frame rods that are close to each other, and a semi-circular clamping pad fixedly connected to the free end of the swing arm, with a hydraulic cylinder connected between the outer wall of the clamping pad and the fixed frame rod on the same side, the openings of the two clamping pads facing each other and able to be combined to form a cylindrical clamp coaxial with the wellhead, and the top of the clamping pad flaring outward to form a conical guide ring.

[0006] The first technical solution of the present invention is further characterized in that, Two fixed support rods are horizontally fixed on the derrick on both sides of the wellhead. Below each of the two fixed support rods, there is another fixed support rod fixed on the derrick. Each of the lower fixed support rods is rotatably connected to a diagonal brace. The free ends of the diagonal braces are all fixed to the free ends of the swing arm on the same side.

[0007] Each fixed support rod on the outside of the derrick is equipped with a back plate at both ends. Each back plate is connected to the fixed support rod by a double-ended bolt, and each double-ended bolt is fitted with an anti-loosening nut.

[0008] Pads are installed on the inner side of the derrick and at the corresponding position of the back plate between each fixed support rod.

[0009] A horizontal single lug plate is fixed at the position where the fixed frame rod connects to the swing arm, hydraulic cylinder, or diagonal brace. A double lug plate that engages with the single lug plate is fixed on the swing arm, hydraulic cylinder, or diagonal brace. A longitudinal pin passes through the holes of the double lug plate and the single lug plate.

[0010] The bottom end of the pin has a pin hole, and a safety pin passes through the pin hole.

[0011] An arc-shaped lug is connected between the hydraulic cylinder and the outer wall of the clamping pad. The inner wall of the arc-shaped lug is adapted to the shape of the outer wall of the clamping pad and is fixedly connected. A hole is opened at the end of the arc-shaped lug near the hydraulic cylinder and is movably connected to the telescopic end of the hydraulic cylinder.

[0012] The second technical solution adopted in this invention is: a drill pipe alignment method for in-situ subsea drilling, comprising the following steps: Step 1: Start the hydraulic cylinder. The extension hydraulic cylinder drives the two swing arms to rotate to the drill rod connection position. At the same time, the openings of the two clamping shoes close together, clamping the lower drill rod in the vertical plane of the clamp. Step 2: Slide the upper drill rod along the inclined surface of the guide ring at the top of the clamp, and use the guiding effect of the inclined surface to make it slide down to the vertical surface of the clamp; Step 3: After aligning the upper and lower drill pipe sections, perform the threaded connection operation.

[0013] The beneficial effects of this invention are as follows: The drill pipe alignment device and method of this invention for in-situ subsea drilling addresses the limited working space during subsea drilling. During drill pipe docking, the hydraulic cylinder extends, driving the swing arm to bring the clamping shoes to the center of the wellhead, forming a clamp to hold the lower drill pipe. The upper drill pipe then slides down the inclined surface of the guide ring to the vertical surface of the clamp, ensuring that the upper and lower drill pipe sections are centered and preventing misalignment and potential damage to the threaded connection. After docking is completed, the hydraulic cylinder retracts, driving the swing arm away from the wellhead without affecting other drilling operations, thus improving work efficiency and significantly reducing drilling exploration costs. This invention can be used on a large scale in offshore drilling. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the drill pipe alignment device for in-situ subsea drilling according to the present invention; Figure 2 This is a top view of the drill pipe centering device of the present invention during centering. Figure 3 This is a top view of the drill pipe alignment device of the present invention when it is opened for in-situ subsea drilling. Figure 4 This is a schematic diagram of the clamping structure in the drill pipe centering device for in-situ subsea drilling of the present invention; Figure 5This is a schematic diagram of the arc-shaped lug in the drill pipe centering device for in-situ subsea drilling of the present invention.

[0015] In the diagram, 1. Fixed support rod, 2. Swing arm, 3. Clamping shoe, 4. Hydraulic cylinder, 5. Guide ring, 6. Diagonal brace, 7. Back plate, 8. Double-ended bolt, 9. Anti-loosening nut, 10. Spacer block, 11. Single ear plate, 12. Double ear plate, 13. Pin, 14. Pin, 15. Arc-shaped ear plate, 16. Wellhead, 17. Derrick, 18. Drill pipe. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Example 1 This invention provides a drill pipe alignment device for in-situ subsea drilling, such as... Figures 1 to 5 As shown, a pair of fixed support rods 1 are horizontally fixed side by side on the derrick 17 on both sides of the wellhead 16. Each fixed support rod 1 has a back plate 7 at both ends on the outer side of the derrick 17. Each back plate 7 is connected to the fixed support rod 1 by a double-ended bolt 8, and each double-ended bolt 8 is fitted with an anti-loosening nut 9. A swing arm 2 located in the horizontal plane is rotatably connected to the side of the two fixed support rods 1 that are close to each other. A semi-circular clamping plate 3 is fixedly connected to the free end of each swing arm 2. A hydraulic cylinder 4 is connected between the outer wall of the clamping plate 3 and the fixed support rod 1 on the same side. A horizontal single ear plate 11 is fixed at the connection point between the fixed support rod 1 and the swing arm 2 or hydraulic cylinder 4. A double ear plate 12, which engages with the single ear plate 11, is fixed to each swing arm 2 or hydraulic cylinder 4. A longitudinal pin 13 passes through the holes of the double ear plate 12 and the single ear plate 11. The bottom end of the pin 13 has a... A pin hole is provided, through which a pin 14 passes. An arc-shaped ear plate 15 connects the hydraulic cylinder 4 to the outer wall of the clamping shoe 3. The inner wall of the arc-shaped ear plate 15 is conforming to the shape of the outer wall of the clamping shoe 3 and is fixedly connected. A hole is opened at the end of the arc-shaped ear plate 15 near the hydraulic cylinder 4, and it is movably connected to the telescopic end of the hydraulic cylinder 4. Alternatively, a single or double ear connection can be used, where the arc-shaped ear plate 15 is configured as an upper and lower double layer. The telescopic end of the hydraulic cylinder 4 is fitted into the double-layered arc-shaped ear plate 15 and has an ear hole, which is then connected to the hole of the arc-shaped ear plate 15 via a pin. The openings of the two clamping shoes 3 face each other and can be combined to form a cylindrical clamp coaxial with the wellhead 16. The top of the clamp flares outward to form a conical guide ring 5.

[0018] Through the above-described method, the drill pipe alignment device of the present invention for in-situ subsea drilling addresses the limited working space during subsea drilling. Therefore, during the drill pipe 18 docking operation, the hydraulic cylinder 4 extends, driving the swing arm 2 to bring the clamping shoe 3 to the center position of the wellhead 16, forming a clamping fixture for the lower drill pipe 18. The upper drill pipe 18 then slides down the inclined surface of the guide ring 5 to the vertical surface of the clamp, ensuring that the upper and lower drill pipe sections 18 are centered, avoiding misalignment and potential damage to the threaded connection during the connection process. After the docking operation is completed, the hydraulic cylinder retracts, driving the swing arm to disengage from the wellhead, without affecting other operations during drilling, thus improving work efficiency and significantly saving drilling exploration costs. This device can be used on a large scale in offshore drilling operations.

[0019] Example 2 This invention provides a drill pipe alignment method for in-situ subsea drilling, employing a drill pipe alignment device for in-situ subsea drilling, such as... Figures 1 to 5 As shown, a pair of fixed support rods 1 are horizontally fixed side by side on the derrick 17 on both sides of the wellhead 16. Each fixed support rod 1 has a back plate 7 at both ends on the outer side of the derrick 17. Each back plate 7 is connected to the fixed support rod 1 by a double-ended bolt 8, and each double-ended bolt 8 is fitted with an anti-loosening nut 9. A swing arm 2 located in the horizontal plane is rotatably connected to the side of the two fixed support rods 1 that are close to each other. A semi-circular clamping plate 3 is fixedly connected to the free end of each swing arm 2. A hydraulic cylinder 4 is connected between the outer wall of the clamping plate 3 and the fixed support rod 1 on the same side. A horizontal single ear plate 11 is fixed at the connection point between the fixed support rod 1 and the swing arm 2 or hydraulic cylinder 4. A double ear plate 12, which engages with the single ear plate 11, is fixed to each swing arm 2 or hydraulic cylinder 4. A longitudinal pin 13 passes through the holes of the double ear plate 12 and the single ear plate 11. The bottom end of the pin 13 has a... A pin hole is provided, through which a pin 14 passes. An arc-shaped ear plate 15 connects the hydraulic cylinder 4 and the outer wall of the clamping shoe 3. The inner wall of the arc-shaped ear plate 15 is adapted to the shape of the outer wall of the clamping shoe 3 and is fixedly connected. A hole is opened at the end of the arc-shaped ear plate 15 near the hydraulic cylinder 4, and it is movably connected to the telescopic end of the hydraulic cylinder 4. Alternatively, a single or double ear connection can be used, where the arc-shaped ear plate 15 is configured as an upper and lower double layer. The telescopic end of the hydraulic cylinder 4 is fitted into the double-layered arc-shaped ear plate 15 and has an ear hole, which is then connected to the hole of the arc-shaped ear plate 15 via a pin. The openings of the two clamping shoes 3 face each other and can be combined to form a cylindrical clamp coaxial with the wellhead 16. The top of the clamp flares outward to form a conical guide ring 5. The following steps are included: Step 1: Start the hydraulic cylinder 4. By extending the hydraulic cylinder 4, the two swing arms 2 are rotated to the connection position of the drill rod 18. At the same time, the openings of the two clamping shoes 3 are closed, and the lower drill rod 18 is clamped in the vertical plane of the fixture. Step 2: Slide the upper drill rod 18 along the inclined surface of the guide ring 5 at the top of the clamp, and use the inclined surface to guide it down to the vertical surface of the clamp. Step 3: After aligning the upper and lower drill rod sections 18, perform the threaded connection operation.

[0020] Example 3 This invention provides a drill pipe alignment device for in-situ subsea drilling, such as... Figures 1 to 5 As shown, the device includes a pair of horizontally parallel fixed support rods 1 on the derrick 17 on both sides of the wellhead 16. Each of the two fixed support rods 1 has a swing arm 2 rotatably connected to its closest side in the horizontal plane. Below each of the two fixed support rods 1, another fixed support rod 1 is arranged parallel to it and fixed to the derrick 17. A diagonal brace 6 is rotatably connected to each of the lower fixed support rods 1. The free ends of the diagonal braces 6 are fixed to the free ends of the swing arms 2 on the same side to prevent the swing arms 2 from sagging during operation and affecting the centering effect. Back plates 7 are provided at both ends of each fixed support rod 1 on the outer side of the derrick 17. Each back plate 7 is connected to the fixed support rod 1 by a double-ended bolt 8, and each double-ended bolt 8 is fitted with an anti-loosening nut 9. The free ends of the swing arm 2 are all fixedly connected to semi-circular clamping plates 3. Hydraulic cylinders 4 are connected between the outer wall of the clamping plates 3 and the fixed support rod 1 on the same side. Horizontal single-ear plates 11 are fixed at the connection points between the fixed support rod 1 and the swing arm 2, hydraulic cylinder 4, or diagonal support 6. Double-ear plates 12, which engage with the single-ear plates 11, are fixed on the swing arm 2, hydraulic cylinder 4, or diagonal support 6. A longitudinal pin 13 passes through the holes of both the double-ear plates 12 and the single-ear plates 11. A pin hole is provided at the bottom of the pin 13, and a [missing information - likely a pin or pin inserted] passes through the pin hole. Pin 14; An arc-shaped ear plate 15 connects the hydraulic cylinder 4 and the outer wall of the clamping shoe 3. The inner wall of the arc-shaped ear plate 15 is adapted to the shape of the outer wall of the clamping shoe 3 and is fixedly connected. The end of the arc-shaped ear plate 15 near the hydraulic cylinder 4 has a hole and is movably connected to the telescopic end of the hydraulic cylinder 4. In specific connection, a single or double ear connection method can also be adopted, that is, the arc-shaped ear plate 15 is set as an upper and lower double layer. The telescopic end of the hydraulic cylinder 4 is fitted into the double-layer arc-shaped ear plate 15 and has an ear hole, and is then connected to the hole of the arc-shaped ear plate 15 through a pin. The openings of the two clamping shoes 3 face each other and can be combined to form a cylindrical clamp coaxial with the wellhead 16. The top of the clamp flares outward to form a conical guide ring 5.

[0021] Example 4 This invention provides a drill pipe alignment method for in-situ subsea drilling, employing a drill pipe alignment device for in-situ subsea drilling, such as... Figures 1 to 5As shown, the device includes a pair of horizontally parallel fixed support rods 1 on the derrick 17 on both sides of the wellhead 16. Each of the two fixed support rods 1 has a swing arm 2 rotatably connected to its closest side in the horizontal plane. Below each of the two fixed support rods 1, another fixed support rod 1 is arranged parallel to it and fixed to the derrick 17. A diagonal brace 6 is rotatably connected to each of the lower fixed support rods 1. The free ends of the diagonal braces 6 are fixed to the free ends of the swing arms 2 on the same side to prevent the swing arms 2 from sagging during operation and affecting the centering effect. Back plates 7 are provided at both ends of each fixed support rod 1 on the outer side of the derrick 17. Each back plate 7 is connected to the fixed support rod 1 by a double-ended bolt 8, and each double-ended bolt 8 is fitted with an anti-loosening nut 9. The free ends of the swing arm 2 are all fixedly connected to semi-circular clamping plates 3. Hydraulic cylinders 4 are connected between the outer wall of the clamping plates 3 and the fixed support rod 1 on the same side. Horizontal single-ear plates 11 are fixed at the connection points between the fixed support rod 1 and the swing arm 2, hydraulic cylinder 4, or diagonal support 6. Double-ear plates 12, which engage with the single-ear plates 11, are fixed on the swing arm 2, hydraulic cylinder 4, or diagonal support 6. A longitudinal pin 13 passes through the holes of both the double-ear plates 12 and the single-ear plates 11. A pin hole is provided at the bottom of the pin 13, and a [missing information - likely a pin or pin inserted] passes through the pin hole. Pin 14; An arc-shaped ear plate 15 connects the hydraulic cylinder 4 and the outer wall of the clamping shoe 3. The inner wall of the arc-shaped ear plate 15 is adapted to the shape of the outer wall of the clamping shoe 3 and is fixedly connected. The end of the arc-shaped ear plate 15 near the hydraulic cylinder 4 has a hole and is movably connected to the telescopic end of the hydraulic cylinder 4. In specific connection, a single or double ear connection method can also be adopted, that is, the arc-shaped ear plate 15 is set as an upper and lower double layer. The telescopic end of the hydraulic cylinder 4 is fitted into the double-layer arc-shaped ear plate 15 and has an ear hole, and is then connected to the hole of the arc-shaped ear plate 15 through a pin. The openings of the two clamping shoes 3 face each other and can be combined to form a cylindrical clamp coaxial with the wellhead 16. The top of the clamp flares outward to form a conical guide ring 5. The following steps are included: Step 1: Start the hydraulic cylinder 4. By extending the hydraulic cylinder 4, the two swing arms 2 are rotated to the connection position of the drill rod 18. At the same time, the openings of the two clamping shoes 3 are closed, and the lower drill rod 18 is clamped in the vertical plane of the fixture. Step 2: Slide the upper drill rod 18 along the inclined surface of the guide ring 5 at the top of the clamp, and use the inclined surface to guide it down to the vertical surface of the clamp. Step 3: After aligning the upper and lower drill rod sections 18, perform the threaded connection operation.

[0022] Example 5 This invention provides a drill pipe alignment device for in-situ subsea drilling, such as... Figures 1 to 5As shown, the device includes a pair of horizontally parallel fixed support rods 1 on the derrick 17 on both sides of the wellhead 16. A back plate 7 is provided at both ends of each fixed support rod 1 on the outer side of the derrick 17. Each back plate 7 is connected to the fixed support rod 1 by a double-ended bolt 8, and each double-ended bolt 8 is fitted with an anti-loosening nut 9. Leveling blocks 10 are provided on the inner side of the derrick 17, corresponding to the back plate 7, to ensure the entire device is on the same horizontal plane. Two fixed support rods 1 are rotatably connected to a swing arm 2 located in the horizontal plane on their adjacent sides. A semi-circular clamping plate 3 is fixedly connected to the free end of each swing arm 2. A hydraulic cylinder 4 is connected between the outer wall of the clamping plate 3 and the fixed support rod 1 on the same side. A horizontal single-ear plate 11 is fixed at the connection point between the fixed support rod 1 and the swing arm 2 or hydraulic cylinder 4. A double-ear plate 12, which engages with the single-ear plate 11, is fixed to each swing arm 2 or hydraulic cylinder 4. A longitudinal pin 13 passes through the holes of both the double-ear plate 12 and the single-ear plate 11. The bottom end of the pin 13 has a... A pin hole is provided, through which a pin 14 passes. An arc-shaped ear plate 15 connects the hydraulic cylinder 4 to the outer wall of the clamping shoe 3. The inner wall of the arc-shaped ear plate 15 is conforming to the shape of the outer wall of the clamping shoe 3 and is fixedly connected. A hole is opened at the end of the arc-shaped ear plate 15 near the hydraulic cylinder 4, and it is movably connected to the telescopic end of the hydraulic cylinder 4. Alternatively, a single or double ear connection can be used, where the arc-shaped ear plate 15 is configured as an upper and lower double layer. The telescopic end of the hydraulic cylinder 4 is fitted into the double-layered arc-shaped ear plate 15 and has an ear hole, which is then connected to the hole of the arc-shaped ear plate 15 via a pin. The openings of the two clamping shoes 3 face each other and can be combined to form a cylindrical clamp coaxial with the wellhead 16. The top of the clamp flares outward to form a conical guide ring 5.

[0023] Example 6 This invention provides a drill pipe alignment method for in-situ subsea drilling, employing a drill pipe alignment device for in-situ subsea drilling, such as... Figures 1 to 5As shown, the device includes a pair of horizontally parallel fixed support rods 1 on the derrick 17 on both sides of the wellhead 16. A back plate 7 is provided at both ends of each fixed support rod 1 on the outer side of the derrick 17. Each back plate 7 is connected to the fixed support rod 1 by a double-ended bolt 8, and each double-ended bolt 8 is fitted with an anti-loosening nut 9. Leveling blocks 10 are provided on the inner side of the derrick 17, corresponding to the back plate 7, to ensure the entire device is on the same horizontal plane. Two fixed support rods 1 are rotatably connected to a swing arm 2 located in the horizontal plane on their adjacent sides. A semi-circular clamping plate 3 is fixedly connected to the free end of each swing arm 2. A hydraulic cylinder 4 is connected between the outer wall of the clamping plate 3 and the fixed support rod 1 on the same side. A horizontal single-ear plate 11 is fixed at the connection point between the fixed support rod 1 and the swing arm 2 or hydraulic cylinder 4. A double-ear plate 12, which engages with the single-ear plate 11, is fixed to each swing arm 2 or hydraulic cylinder 4. A longitudinal pin 13 passes through the holes of both the double-ear plate 12 and the single-ear plate 11. The bottom end of the pin 13 has a... A pin hole is provided, through which a pin 14 passes. An arc-shaped ear plate 15 connects the hydraulic cylinder 4 and the outer wall of the clamping shoe 3. The inner wall of the arc-shaped ear plate 15 is adapted to the shape of the outer wall of the clamping shoe 3 and is fixedly connected. A hole is opened at the end of the arc-shaped ear plate 15 near the hydraulic cylinder 4, and it is movably connected to the telescopic end of the hydraulic cylinder 4. Alternatively, a single or double ear connection can be used, where the arc-shaped ear plate 15 is configured as an upper and lower double layer. The telescopic end of the hydraulic cylinder 4 is fitted into the double-layered arc-shaped ear plate 15 and has an ear hole, which is then connected to the hole of the arc-shaped ear plate 15 via a pin. The openings of the two clamping shoes 3 face each other and can be combined to form a cylindrical clamp coaxial with the wellhead 16. The top of the clamp flares outward to form a conical guide ring 5. The following steps are included: Step 1: Start the hydraulic cylinder 4. By extending the hydraulic cylinder 4, the two swing arms 2 are rotated to the connection position of the drill rod 18. At the same time, the openings of the two clamping shoes 3 are closed, and the lower drill rod 18 is clamped in the vertical plane of the fixture. Step 2: Slide the upper drill rod 18 along the inclined surface of the guide ring 5 at the top of the clamp, and use the inclined surface to guide it down to the vertical surface of the clamp. Step 3: After aligning the upper and lower drill rod sections 18, perform the threaded connection operation.

Claims

1. A drill pipe alignment device for in-situ subsea drilling, characterized in that, It includes a pair of fixed frame rods (1) arranged side by side. The two fixed frame rods (1) are rotatably connected to a swing arm (2) located in the horizontal plane on the side close to each other. The free ends of the swing arms (2) are fixedly connected to a semi-circular clamping tile (3). The outer wall of the clamping tile (3) is connected to the fixed frame rod (1) on the same side by a hydraulic cylinder (4). The openings of the two clamping tiles (3) face each other and can be combined to form a cylindrical clamp coaxial with the wellhead (16). The top of the clamp is flared outward to form a conical guide ring (5).

2. The drill pipe alignment device for in-situ subsea drilling as described in claim 1, characterized in that, The two fixed support rods (1) are respectively horizontally fixed on the derrick (17) on both sides of the wellhead (16). Below each of the two fixed support rods (1), there is another fixed support rod (1) fixed on the derrick (17) in parallel. The lower fixed support rods (1) are rotatably connected to the inclined support frame (6). The free end of the inclined support frame (6) is fixed to the free end of the swing arm (2) on the same side.

3. The drill pipe alignment device for in-situ subsea drilling as described in claim 2, characterized in that, The outer side of the derrick (17) is provided with a back plate (7) at both ends of each fixed frame rod (1). Each back plate (7) is connected to the fixed frame rod (1) by a double-headed bolt (8). Each double-headed bolt (8) is fitted with a lock nut (9).

4. The drill pipe alignment device for in-situ subsea drilling as described in claim 3, characterized in that, Pads (10) are provided on the inner side of the derrick (17) and at the position corresponding to the back plate (7) between each fixed support rod (1).

5. The drill pipe alignment device for in-situ subsea drilling as described in claim 2, characterized in that, The fixed frame rod (1) is fixed with a horizontal single ear plate (11) at the position where it connects to the swing arm (2), hydraulic cylinder (4) or diagonal support frame (6). The swing arm (2), hydraulic cylinder (4) or diagonal support frame (6) is fixed with a double ear plate (12) that engages with the single ear plate (11). The holes of the double ear plate (12) and the single ear plate (11) are connected by a longitudinal pin (13).

6. The drill pipe alignment device for in-situ subsea drilling as described in claim 5, characterized in that, The bottom end of the pin (13) is provided with a pin hole, and a pin (14) passes through the pin hole.

7. The drill pipe alignment device for in-situ subsea drilling as described in claim 1, characterized in that, An arc-shaped ear plate (15) is connected between the hydraulic cylinder (4) and the outer wall of the clamping tile (3). The inner wall of the arc-shaped ear plate (15) is adapted to the shape of the outer wall of the clamping tile (3) and is fixedly connected. A hole is opened at one end of the arc-shaped ear plate (15) near the hydraulic cylinder (4) and is movably connected to the telescopic end of the hydraulic cylinder (4).

8. A method for aligning drill pipes using the drill pipe alignment device for in-situ subsea drilling as described in claim 1, characterized in that, Includes the following steps: Step 1: Start the hydraulic cylinder (4). The extension hydraulic cylinder (4) drives the two swing arms (2) to rotate to the drill rod (18) connection position. At the same time, the two clamping shoes (3) close their openings and clamp the lower drill rod (18) in the vertical plane of the clamp. Step 2: Slide the upper drill rod (18) along the inclined surface of the guide ring (5) at the top of the clamp, and use the guiding effect of the inclined surface to make it slide down to the vertical surface of the clamp; Step 3: After the upper and lower drill rod sections (18) are aligned, perform the threaded connection operation.

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