Pressure-adjustable pressure-control marine riser device

Abstract

The invention discloses a pressure-adjustable pressure control marine riser device which is connected to the lower portion of a marine riser string during working and comprises a middle pipe body, pipe body pressure adjusting structures are arranged on the two sides of the middle pipe body, each pipe body pressure adjusting structure comprises a valve body assembly connected with the middle pipe body, and the valve body assemblies are connected with valve drivers. An upper flange and a lower flange are arranged at the two ends of the middle pipe body respectively, a throttling well killing pipeline, a hydraulic pipeline and a mud pipeline assembly are fixed to the circumferences of the upper flange and the lower flange at the same time, and the upper flange and the lower flange are correspondingly provided with a main bearing nut and a main bearing bolt respectively. While the basic functions of the marine drilling riser device are met, the operation safety of marine drilling riser system equipment can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of marine natural gas hydrate drilling and production equipment, and relates to a pressure-adjustable pressure-controlled watertight pipe device. Background Art

[0002] The offshore drilling riser device is the core equipment for offshore oil and gas development and the main body of the offshore drilling riser system. It has many uses such as connecting the platform with the seabed drilling blowout preventer, circulating mud in the annulus during drilling, guiding drilling tools in the tubing, fixing and connecting auxiliary pipelines, lifting, lowering and installing underwater equipment. It is usually composed of riser connectors, connectors, main pipes, side pipes, seals and other components.

[0003] Traditional riser devices only have the functions of tension, pressure and sealing in connection with the pipe string, and do not have the function of regulating the internal pressure of the pipe string. In addition, the deepwater riser system is equipped with a riser injection valve, which is usually installed 300-600m underwater. The pressure difference inside the pipe can be designed. When in use, if the pressure inside the pipe string decreases and the pressure difference between the inside and outside reaches the designed pressure difference, the injection valve drives the valve body to open automatically or by pressure control, so that seawater is injected into the pipe string to achieve pressure balance. It is a safety device in the field to prevent the pipe string from being crushed by external pressure due to excessive pressure difference between the inside and outside. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure-adjustable pressure-controlled watertight pipe device, which can ensure the operating safety of the marine drilling watertight pipe system equipment while meeting the basic functions of the marine drilling watertight pipe device.

[0005] The technical solution adopted by the present invention is a pressure-adjustable pressure-controlled watertight pipe device, which is connected to the lower part of the watertight pipe string when working, and includes an intermediate pipe body. Both sides of the intermediate pipe body are provided with pipe body pressure regulating structures. The pipe body pressure regulating structure includes a valve body assembly connected to the intermediate pipe body, and the valve body assembly is connected to a valve driver. Upper flange and lower flange are respectively provided at both ends of the intermediate pipe body. Throttling well-pressurizing pipelines, hydraulic pipelines, and mud pipeline assemblies are fixed on the circumference of the upper flange and the lower flange at the same time. The upper flange and the lower flange are respectively provided with main load-bearing nuts and main load-bearing bolts.

[0006] The present invention is also characterized in that:

[0007] The main bearing nut is inlaid with a locking snap ring in the annular groove of the upper flange, and the main bearing nut is locked by a locking block, which is inserted into a groove provided on the outer wall of the main bearing nut, and the locking block is fixed to the upper flange by screws;

[0008] A main bearing washer is arranged between the main bearing bolt and the lower flange, and the main bearing washer is also locked by a locking block. The locking block is inserted into a slot provided on the outer wall of the main bearing washer, and the locking block is fixed to the lower flange by screws.

[0009] The upper flange is fixedly connected with a sealing bushing through a locking pin, and the sealing bushing is provided with multiple main seals.

[0010] The upper flange fixes the side pipe of the riser by arranging a throttling and well-killing pipeline locking nut, a throttling and well-killing pipeline anti-loosening nut, and a hydraulic pipeline anti-loosening nut, and a throttling and well-killing pipeline seal is arranged in the sealing groove at the female joint end of the throttling and well-killing pipeline in the lower flange.

[0011] A sealing ring III is provided between the valve driver and the valve body assembly.

[0012] Both sides of the intermediate pipe body are connected with conversion flanges through bolts, and the conversion flanges are connected with the valve body assembly through conversion flange connecting bolts and conversion flange connecting nuts.

[0013] Sealing ring II is arranged between the intermediate pipe body and the conversion flange, and between the valve body assembly and the conversion flange.

[0014] A fluid channel and a valve body sealing assembly are provided inside the valve body assembly. The valve body sealing assembly is used for opening and closing the fluid channel. The fluid channel is connected with the fluid channel inside the conversion flange and the main channel of the intermediate tube body in sequence. The valve body sealing assembly includes a sealing gate, a valve seat, a valve seat seal, and a screw plug. The sealing gate is connected to the valve driver. The valve driver drives the sealing gate to insert or pull out the valve seat. A discharge hole is provided at the bottom of the valve body assembly. A valve block end flange is provided at the end of the valve body assembly.

[0015] The valve block end flange is fixedly connected to the valve body assembly through the valve body end flange connecting bolts and the valve body end flange connecting nuts.

[0016] A sealing ring I is arranged between the valve body assembly and the end flange of the valve block.

[0017] The beneficial effects of the present invention are:

[0018] The pressure-adjustable pressure-controlled riser device of the present invention is aimed at the natural gas hydrate marine drilling exploration field. It is a special riser short section that can adjust the fluid pressure of the riser pipe string according to the demand for internal pressure control of the riser pipe string. It can be matched with the riser pipe string. The main function is to adjust the valve body through the valve driver to drive the side openings on both sides of the main body to release the internal fluid of the pipe body, thereby achieving the purpose of regulating and balancing the pressure of the pipe string. It fully meets the drilling operations in deep water, ultra-deep water and other working environments in the ocean. While meeting the basic functions of the marine drilling riser device, it can ensure the operation safety of the marine drilling riser system equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a main cross-sectional view of the pressure-adjustable pressure-controlled watertight pipe device of the present invention;

[0020] Figure 2is a top view of the pressure-adjustable pressure-controlled watertight pipe device of the present invention;

[0021] Figure 3 It is an enlarged view of the upper flange connection mechanism of the pressure-adjustable pressure-controlled watertight pipe device of the present invention;

[0022] Figure 4 It is an enlarged view of the lower flange connection mechanism of the pressure-adjustable pressure-controlled watertight pipe device of the present invention;

[0023] Figure 5 This is an enlarged view of the valve body of the pressure-adjustable pressure-controlled watertight pipe device of the present invention.

[0024] In the figure, 1. upper flange, 2. intermediate pipe body 2, 3. lower flange, 4. throttling and well-killing pipeline, 5. sealing bushing, 6. main seal, 7. hydraulic pipeline, 8. throttling and well-killing pipeline locking nut, 9. throttling and well-killing pipeline anti-loosening nut, 10. hydraulic pipeline anti-loosening nut, 11. valve driver, 12. valve body assembly, 13. conversion flange, 14. main bearing bolt, 15. throttling and well-killing pipeline seal, 16. main bearing nut, 17. locking snap ring, 18. locking pin, 19. locking block, 20. screw , 21. Main bearing gasket, 22. Valve body end flange connecting bolts, 23. Valve body end flange connecting nuts, 24. Valve body end flange, 25. Sealing gasket ring I, 26. Sealing plug assembly, 27. Mud pipeline assembly, 28. Conversion flange connecting bolts, 29. Conversion flange connecting nuts, 30. Sealing gasket ring II, 31. Valve driver connecting bolts, 32. Valve driver connecting nuts, 33. Sealing gasket ring III, 34. Valve stem, 35. Sealing gate, 36. Valve seat, 37. Valve seat seal. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] This embodiment provides a pressure-adjustable pressure-controlled watertight pipe device, which is connected to the lower part of the watertight pipe string during operation. Figure 1As shown, it includes an intermediate pipe body 2, and pipe body pressure regulating structures are arranged on both sides of the intermediate pipe body 2. The pipe body pressure regulating structure includes a valve body assembly 12 connected to the intermediate pipe body 2, and the valve body assembly 12 is connected to the valve driver 11 through valve driver connecting bolts 31 and valve driver connecting nuts 32. A sealing gasket ring III 33 is arranged between the valve driver 11 and the valve body assembly 12, and an upper flange 1 and a lower flange 3 are arranged at both ends of the intermediate pipe body 2. A throttling and well-pressurizing pipeline 4, a hydraulic pipeline 7, and a mud pipeline assembly 27 are fixed on the circumference of the upper flange 1 and the lower flange 3 at the same time. The upper flange 1 and the lower flange 3 are respectively provided with main bearing nuts 16 and main bearing bolts 14, and the upper flange 1 and the lower flange 3 are connected to the corresponding single watertight pipe through the main bearing bolts 14 and the main bearing nuts 16.

[0028] like Figure 3 As shown, the main bearing nut 16 is embedded with a locking snap ring 17 in the annular groove of the upper flange 1, and the main bearing nut 16 is locked by a locking block 19, which is inserted into a groove provided on the outer wall of the main bearing nut 16, and the locking block 19 is fixed to the upper flange 1 by screws 20;

[0029] like Figure 4 As shown, a main bearing washer 21 is arranged between the main bearing bolt 14 and the lower flange 3 , and the main bearing washer 21 is also locked by a locking block 19 . The locking block 19 is inserted into a slot provided on the outer wall of the main bearing washer 21 , and the locking block 19 is fixed to the lower flange 3 by screws 20 .

[0030] Example 2

[0031] This embodiment provides a pressure-adjustable pressure-controlled watertight pipe device. On the basis of embodiment 1, 3. According to the pressure-adjustable pressure-controlled watertight pipe device of claim 1, the upper flange 1 is fixedly connected with the sealing bushing 5 through two locking pins 18, and the sealing bushing 5 is provided with four main seals 6. The locking pin 18 is provided at the upper diameter portion of the sealing bushing 5 connected with the upper flange 1. The upper flange 1 matched therewith has a straight groove in the axial portion, and a circumferential annular groove is provided at the bottom of the groove. During installation, the sealing bushing 5 and the two locking pins 18 installed thereon are inserted along the straight groove in the axial portion of the upper flange 1 until the circumferential annular groove is formed, and then the sealing bushing 5 can be connected to the upper flange 1 by rotating 90 degrees.

[0032] The upper flange 1 is fixed to the watertight pipe side pipe by setting the throttling and well-killing pipeline locking nut 8, the throttling and well-killing pipeline anti-loosening nut 9, and the hydraulic pipeline anti-loosening nut 10. The throttling and well-killing pipeline seal 15 is set in the female joint end sealing groove of the throttling and well-killing pipeline 4 in the lower flange 3. Specifically, the throttling and well-killing pipeline 4 is fixedly connected to the upper flange 1 and the lower flange 3 by the throttling and well-killing pipeline locking nut 8, the throttling and well-killing pipeline anti-loosening nut 9 and the throttling and well-killing pipeline 4 itself. Two throttling and well-killing pipeline seals 15 are designed in the female end groove of the throttling and well-killing pipeline. The hydraulic pipeline anti-loosening nut 10 on the hydraulic pipeline 7, the hydraulic pipeline 7, and the mud pipeline assembly 27 are respectively fixedly connected to the upper flange 1 and the lower flange 3 by their corresponding steps, locking nuts, and anti-loosening nuts.

[0033] Example 3

[0034] The present embodiment provides a pressure-adjustable pressure-controlling watertight pipe device. On the basis of Embodiment 2, both sides of the intermediate pipe body 2 are connected with conversion flanges 13 by bolts, and the conversion flange 13 is connected with the valve body assembly 12 by conversion flange connecting bolts 28 and conversion flange connecting nuts 29. Sealing gasket rings II 30 are provided between the intermediate pipe body 2 and the conversion flange 13, and between the valve body assembly 12 and the conversion flange 13.

[0035] like Figure 5 As shown, a fluid channel and a valve body sealing assembly are provided inside the valve body assembly 12. The valve body sealing assembly is used for opening and closing the fluid channel. The fluid channel is sequentially connected to the fluid channel inside the conversion flange 13 and the main channel of the intermediate pipe body 2. The valve body sealing assembly includes a sealing gate 35, a valve seat 36, a valve seat seal 37, and a screw plug 26. The sealing gate 35 is connected to the valve driver 11. The valve driver 11 is a device in which a valve stem normally extends to close the valve body assembly, and a hydraulic or underwater robot drives the valve stem to retract to open the valve body assembly. The valve stem 34 of the valve driver 11 is connected to the sealing gate 35 and drives the sealing gate 35 to insert into the valve seat 36 and seal with the valve seat. 37 together realize the closing and sealing of the fluid channel of the valve body assembly 12, the valve stem drives the sealing gate 35 to separate from the valve seat 36, and realizes the opening of the fluid channel of the valve body assembly 12. A discharge hole is opened at the bottom of the valve body assembly 12, and the fluid in the main channel of the intermediate tube body 2 passes through the internal fluid flow channel of the conversion flange 13, and then is discharged from the internal flow channel of the valve body assembly 12 and its fluid discharge hole. A valve block end flange 24 is arranged at the end of the valve body assembly 12, and a sealing gasket ring I 25 is arranged between the valve body assembly 12 and the valve block end flange 24. The valve block end flange 24 is fixedly connected to the valve body assembly 12 by the valve body end flange connecting bolts 22 and the valve body end flange connecting nuts 23.

[0036] The working principle of the pressure-adjustable pressure-controlled watertight pipe device of the present invention is as follows:

[0037] The pressure-adjustable pressure-controlled watertight pipe device of the present invention is connected to the watertight pipe system when working. First, the watertight pipe lifting tool is inserted into the upper flange 1 of the adjustable pressure-controlled watertight pipe device, and the locking block is pushed out and inserted into the lifting groove of the upper flange 1, thereby connecting the watertight pipe lifting tool with the adjustable pressure-controlled watertight pipe device. Then the lifting tool lifts the adjustable pressure-controlled watertight pipe device and connects it with the single watertight pipe fixed on the turntable. When connecting, the main bearing bolt 14 in the upper flange 1 is first driven to screw into the main bearing nut 16 in the corresponding single lower flange 3 until a predetermined torque is applied. At this time, one end of the locking block 19 is inserted into the slot of the main bearing nut 16 or the main bearing washer 21 to lock the main bearing nut 16 and the main bearing washer 21, providing a reaction torque for the main bearing bolt 14 to screw into the main bearing nut 16, thereby successfully connecting the adjustable pressure-controlled watertight pipe device with the corresponding single watertight pipe. At the same time, the sealing bushing 5, the throttling and well-killing pipeline 4, the hydraulic pipeline 7, and the mud pipeline assembly 27 are also respectively inserted into the corresponding pipelines configured in the watertight pipe system and rely on the seals installed on each component to achieve the internal and external sealing of the corresponding pipelines. During the entire connection process, the sealing bushing 5 is fixedly connected to the upper flange 1 through the locking pin 18, and the throttling and well-killing pipeline 4, the hydraulic pipeline 7, and the mud pipeline assembly 27 are fixedly connected to the adjustable pressure-controlled watertight pipe device through the locking and loosening nuts at the ends of the female joints and male joints that match the step holes of the lower flange. After the adjustable pressure-controlled watertight pipe device is connected to the watertight pipe system, it can realize the functions of circulating mud, lifting and lowering the guide drilling tools in the pipe string, installing underwater equipment, and well control through the main pipe body, throttling and well-killing pipeline, hydraulic pipeline, and mud pipeline assembly.

[0038] During normal production operation of the riser system, the adjustable pressure-controlled riser device adjusts the pressure through two sets of regulating pipe body pressure regulating device valve drivers 11 and valve body assembly 12 arranged on both sides of the intermediate pipe body 2. During pressure adjustment, the pressure is adjusted by adjusting the valve body assembly valve between the intermediate pipe body 2, the conversion flange 13, the valve body assembly 12 and the seawater communication channel of the adjustable pressure-controlled riser device. The driver drives the valve stem 34 and the sealing gate 35 to reciprocate and insert and leave the valve seat 36 to realize the opening and closing of the valve body assembly valve, complete the communication between the main pipe of the adjustable pressure-controlled riser device and the external seawater, and then realize the adjustment of the internal pressure of the adjustable pressure-controlled riser device. In the actual working process, the valve of the valve body assembly adopts a normally closed hydraulic drive to realize remote control, that is, when the hydraulic system pressure is disconnected, the gate valve composed of the sealing gate 35, the valve seat 36, etc. is automatically closed by the reset spring; at the same time, a spare ROV operation interface is provided on the driver. When the hydraulic system fails, the valve can be manually opened by ROV operation.

[0039] From the above content, it can be seen that the pressure-adjustable pressure-controlled watertight pipe device of the present invention, in addition to meeting all the functional requirements of the traditional watertight pipe device, also has the function of regulating and balancing the pressure inside the watertight pipe; the throttling well-pressurizing pipeline, hydraulic pipeline, and mud boosting pipeline are designed with multiple dividing circles, and the miniaturization and multi-dividing circle design of the main bearing bolts and main bearing nuts saves space, optimizes and reduces the size of the upper and lower flanges; the pressure control structure of the symmetrically configured conversion flanges 13 on both sides of the intermediate pipe body 2, the valve body assembly 12 and the valve driver 11, the valve driver hydraulics, and the underwater robot dual backup control can provide an effective control means for the pressure control in the well and provide a barrier for the safety of oil and gas wells.

Claims

1. The pressure-adjustable pressure-controlled watertight pipe device is connected to the lower part of the watertight pipe string during operation, and is characterized by: The invention comprises an intermediate pipe body (2), both sides of which are provided with a pipe body pressure regulating structure, the pipe body pressure regulating structure comprising a valve body assembly (12) connected to the intermediate pipe body (2), the valve body assembly (12) being connected with a valve driver (11), an upper flange (1) and a lower flange (3) being respectively provided at both ends of the intermediate pipe body (2), a throttling well-killing pipeline (4), a hydraulic pipeline (7) and a mud pipeline assembly (27) being simultaneously fixed on the circumference of the upper flange (1) and the lower flange (3), and a main bearing nut (16) and a main bearing bolt (14) being respectively provided on the upper flange (1) and the lower flange (3).

2. The pressure-adjustable pressure-controlled watertight pipe device according to claim 1, characterized in that: The main bearing nut (16) is embedded with a locking snap ring (17) in the annular groove of the upper flange (1), and the main bearing nut (16) is locked by a locking block (19). The locking block (19) is inserted into a groove provided on the outer wall of the main bearing nut (16), and the locking block (19) is fixed to the upper flange (1) by a screw (20); A main bearing washer (21) is arranged between the main bearing bolt (14) and the lower flange (3), and the main bearing washer (21) is also locked by a locking block (19). The locking block (19) is inserted into a slot provided on the outer wall of the main bearing washer (21), and the locking block (19) is fixed to the lower flange (3) by a screw (20).

3. The pressure-adjustable pressure-controlled watertight pipe device according to claim 1, characterized in that: The upper flange (1) is fixedly connected to a sealing bushing (5) via a locking pin (18), and the sealing bushing (5) is provided with a plurality of main seals (6).

4. The pressure-adjustable pressure-controlled watertight pipe device according to claim 1, characterized in that: The upper flange (1) fixes the watertight pipe side pipe by arranging a throttling and well-killing pipeline locking nut (8), a throttling and well-killing pipeline anti-loosening nut (9), and a hydraulic pipeline anti-loosening nut (10), and a throttling and well-killing pipeline seal (15) is arranged in the sealing groove of the female joint end of the throttling and well-killing pipeline (4) in the lower flange (3).

5. The pressure-adjustable pressure-controlled watertight pipe device according to claim 1, characterized in that: A sealing gasket ring III (33) is provided between the valve driver (11) and the valve body assembly (12).

6. The pressure-adjustable pressure-controlled watertight pipe device according to claim 1, characterized in that: Both sides of the intermediate pipe body (2) are connected to conversion flanges (13) via bolts, and the conversion flange (13) is connected to the valve body assembly (12) via conversion flange connecting bolts (28) and conversion flange connecting nuts (29).

7. The pressure-adjustable pressure-controlled watertight pipe device according to claim 6, characterized in that: A sealing ring II (30) is provided between the intermediate pipe body (2) and the conversion flange (13), and between the valve body assembly (12) and the conversion flange (13).

8. The pressure-adjustable pressure-controlled watertight pipe device according to claim 1, characterized in that: The valve body assembly (12) is provided with a fluid channel and a valve body sealing assembly. The valve body sealing assembly is used for opening and closing the fluid channel. The fluid channel is connected with the fluid channel inside the conversion flange (13) and the main channel of the intermediate tube body (2) in sequence. The valve body sealing assembly comprises a sealing gate (35), a valve seat (36), a valve seat seal (37), and a screw plug (26). The sealing gate (35) is connected to the valve driver (11). The valve driver (11) drives the sealing gate (35) to insert or remove the valve seat (36). A discharge hole is provided at the bottom of the valve body assembly (12). A valve block end flange (24) is provided at the end of the valve body assembly (12).

9. The pressure-adjustable pressure-controlled watertight pipe device according to claim 8, characterized in that: The valve block end flange (24) is fixedly connected to the valve body assembly (12) via valve body end flange connecting bolts (22) and valve body end flange connecting nuts (23).

10. The pressure-adjustable pressure-controlled watertight pipe device according to claim 8 or 9, characterized in that: A sealing gasket ring I (25) is provided between the valve body assembly (12) and the valve block end flange (24).

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