CN107654775A - A kind of submarine pipeline adpting flange - Google Patents

Abstract

The invention relates to an underwater pipeline connection flange, which is composed of a shell system, a tightening system and a sealing system. Pipes are installed inside. Working principle: Turn the nut to make the moving flange move axially, the moving flange moves axially and then pushes the holding cylinder to move axially, the holding cylinder axially makes the holding column extend radially, and the holding column extends radially So as to hold the pipeline tightly; turn the jacking bolt to change the pressure degree of the metal sealing ring, so as to achieve the purpose of changing the size of the sealing force. Compared with the prior art, the present invention can independently adjust the diameter holding force and sealing pressure of the device, and quickly install flanges for underwater submarine pipelines to realize the rapid repair and connection of submarine pipelines, thereby shortening the repair period of submarine pipelines, Reduce labor intensity and reduce the overall cost of offshore oil and gas transportation.

Description

An underwater pipeline connection flange

technical field

The invention relates to the technical field of oil and gas submarine pipeline emergency repair equipment, in particular to an underwater pipeline connection flange.

Background technique

With the shortage of land oil and gas resources, the world's coastal countries have successively explored and exploited offshore oil and gas resources, and the exploration and exploitation of offshore oil and gas resources has gradually become the main trend of the development of the oil and gas industry at home and abroad. In addition, as my country's economy continues to grow rapidly, insufficient supply of oil and gas resources will become the main contradiction hindering economic development. In order to increase the possession of oil and gas resources, offshore oil and gas exploration and exploitation have become the strategic focus of my country's sustainable energy development.

Submarine pipelines undertake important tasks such as the output of underwater oil and gas wells, the transportation of subsea crude oil, natural gas and associated gas media, so the safe and stable operation of submarine pipelines is of great significance to the development and utilization of marine oil and gas resources. Due to the operating conditions of the seabed and the special environment of the surrounding seawater, the submarine pipeline has risks such as fatigue damage, geological disaster damage, corrosion damage, ship anchor damage, and third-party damage in marine exploration and development. Once a submarine pipeline leaks, it will not only damage the downstream and The normal production and life of end users will be adversely affected, and it will also cause marine environmental pollution, waste of oil and gas resources, and interruption of oil field production.

If the submarine pipeline is damaged or damaged during operation, it needs to be repaired or reinforced. At present, there are three main subsea pipeline repair technologies: pipe clamp plugging, composite material reinforcement and underwater pipe section replacement. Among them, the composite material reinforcement technology, such as injection of epoxy resin and other materials, is easy to cause impact damage to the pipe body of the submarine pipeline, and the injection machine equipment is complex and huge, and the on-site materials are self-made and the underwater operation process is complicated. It is not conducive to the rapid repair of submarine pipelines. The leak plugging and repair technology of pipe clamps adopts mechanical plugging, which has the advantages of simple implementation and short operation period. It can be used for pipeline leakage caused by corrosion, base metal defects, cracks and other reasons in the Bohai Sea area. However, once the submarine pipeline is severely damaged or When there is a large deformation and the submarine pipeline is in a deep or deep water area, it is difficult for this technology to achieve effective plugging and repair. Submarine pipeline section replacement and repair technology is characterized by a wide range of applications, and can complete various forms of submarine pipeline damage repairs such as corrosion or fracture; submarine pipeline section replacement is divided into: submarine pipeline welding replacement technology and submarine pipeline connector connection technology. However, the submarine pipeline welding replacement technology has many procedures, high environmental requirements, complex structure, and cannot achieve rapid replacement. Therefore, the replacement efficiency of the pipe section is not high, and the reliability of the connection is not ideal; the submarine pipeline connector technology can solve the above problems, but the disadvantages are The production of key spare parts such as mechanical connectors for repair and its repair operation equipment and operation process have always been in the hands of foreign professional companies, and there are few corresponding domestic equipment and technologies. In addition, at present, the equipment for subsea pipeline section replacement at home and abroad is mainly based on connectors. For example, patent number CN201620156196.8 discloses a new type of submarine pipeline connector, and patent number CN201510054118.7 discloses a submarine pipeline clamp repair connector. , Patent No. CN201621328659.0 discloses a submarine pipeline plugging device and a split submarine pipeline plugging fixture, and Patent No. CN201610319504.9 is an adjustable and partial submarine pipeline quick repair connection device. The medium sealing force of the above-mentioned device is determined by the pre-tightening force of the bolts, and the bolts not only need to radially hold the pipeline tightly, but also realize the connection between the flange end covers, so the sealing force cannot be adjusted independently; If the pre-tightening force of the bolts is too small, the sealing force will be too small and insufficient to cause leakage. If the pre-tightening force of the bolts is too large, the service life of the sealing system will be reduced. Therefore, it is urgent to design a device with independently adjustable radial holding force and sealing force.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the existing subsea pipe section replacement equipment, the purpose of the present invention is to provide an underwater pipeline connection flange, which can quickly install flanges for underwater subsea pipelines, and the sealing force, radial holding force The size can be adjusted independently, so as to realize the rapid repair connection of submarine pipelines and shorten the repair period of submarine pipelines.

In order to achieve the above object, the technical solution of the present invention is achieved in that:

An underwater pipeline connection flange, which is composed of a shell system 1, a holding system 2 and a sealing system 3, and is characterized in that: the holding system 2 is installed on the left side of the inner surface of the shell system 1, and the shell system 1 A sealing system 3 is installed in the right side of the inner surface of the inner surface; a pipe 4 is in contact with the inner surface of the tight system 2 and the sealing system 3;

The housing system 1 includes a movable flange 11 and a fixed flange 12; the movable flange 11 is in the shape of a hollow ring, and the left end surface of the ring is designed with uniformly distributed regular hexagonal blind holes, and the regular hexagonal blind holes are installed with The bolt head, the bottom surface of the positive six-deformed blind hole is designed with a circular through hole, and the bolt passes through the circular through hole to make the movable flange 11 and the fixed flange 12 form a bolted connection; the inner side of the left end of the movable flange 11 is designed with a small through hole. In the small through hole, the polished rod of the jacking bolt 31 passes through, and the bolt head of the jacking bolt 31 is in close contact with the moving flange 11; the right end surface of the moving flange 11 is designed with a ring protrusion 13, and the ring protrusion The outer surface of 13 is in contact with the inner surface of the stepped barrel 21; the inner surface of the fixed flange 12 is designed with a large stepped hole 14, a middle stepped hole 15 and a small stepped hole 16, and the large stepped hole 14 is equipped with a holding system 2, the middle stepped hole The sealing system 3 is installed in the hole 15, and the rubber gasket 34 is installed in the small stepped hole 16; the end surface of the middle stepped hole 15 is designed with an annular groove, and a metal sealing ring 33 is installed in the annular groove; the middle part of the outer surface of the fixed flange 12 It is designed with a step protruding outward, and the end face of the step is designed with uniform through holes, and the bolts pass through the through holes and nuts to form a fast connection between the movable flange 11 and the fixed flange 12; the right end face of the fixed flange 12 is designed with Evenly distributed through holes, the bolts pass through the through holes so that the fixed flange 12 and the prefabricated flange pipe 5 form a bolt fastened connection;

The clamping system 2 includes a stepped tube 21, a clamping tube 22, a clamping column 23, a trapezoidal block 24, and a positioning pin 25; the stepped tube 21 is in the shape of a hollow stepped cylinder, and the left end surface of the stepped tube 21 is designed with a long through hole 26. The end surface of the long through hole 26 is designed with a threaded hole, and the internal thread of the threaded hole and the external thread of the jacking bolt 31 interlock; the right end surface of the stepped barrel 21 is designed with an inner step 27, and the left end surface of the inner step 27 is evenly distributed with blind holes , the positioning pin 25 is installed in the blind hole; the inner surface of the stepped tube 21 is in contact with the outer surface of the holding tube 22, and the inner surface of the holding tube 22 is designed with a wedge surface uniformly distributed along the circumferential direction; the wedge surface of the holding tube 22 Contact with the top of the tight column 23, the tight column 23 is installed in the support block; The wedge surfaces cooperate with each other to slide; the bottom end of the holding column 23 is designed with a ball, and the ball passes through the trapezoidal block 24 to contact the pipeline; the middle part of the holding column 23 is designed with a stepped shaft, and the lower end of the stepped shaft is in contact with a compression spring , the bottom of the clip spring is in contact with a trapezoidal block 24; the inner surface of the trapezoidal block 24 is arc-shaped, the outer surface of the trapezoidal block 24 is stepped, and the surface of each step is designed with a circular through hole, and the circular through hole is inserted with Hold the column 23 tightly; the right end face of the step block is designed with a blind hole, and a positioning pin 25 is installed in the blind hole, and the right end face of the trapezoidal block 24 is in contact with the inner step 27 of the step tube 21;

The sealing system 3 includes a tightening bolt 31, a moving ring 32, a metal sealing ring 33, and a rubber gasket 34; the bolt head of the tightening bolt 31 is in contact with the movable flange 11, and the external thread of the tightening bolt 31 is in contact with the stepped sleeve The internal thread is matched, and the right end surface of the tightening bolt 31 is in contact with the moving ring 32; the right end surface of the moving ring 32 is designed with an annular groove, and a metal sealing ring 33 is installed in the annular groove, and the metal sealing ring 33 is H-shaped; the metal sealing ring The inner surface of the ring 33 has an annular groove; the rubber gasket 34 is installed between the pipe and the small stepped hole 16 of the fixed flange 12 .

Compared with the prior art, the beneficial effects of the present invention are: (1) Quickly manufacture flanges for the replacement section of the submarine pipeline, thereby realizing quick connection of the replacement pipeline; (2) The sealing force of the device can be independently adjusted, and then Ensure the safety and reliability of the flange connection seal; (3) The radial clamping force of the device to the pipeline can also be adjusted independently, so that the adjustment of the radial clamping force is separated from the adjustment of the sealing force, ensuring that the device Radial clamping ability to the pipeline; (4) The ball clamping column of the device is in contact with the pipeline, thereby reducing the clamping damage of the clamping system to the pipeline.

Description of drawings

Figure 1 is a cross-sectional plan view of the present invention.

Fig. 2 is a three-dimensional schematic diagram of the present invention.

Figure 3 is a three-dimensional sectional view of the present invention.

Fig. 4 is a three-dimensional plane sectional view of the present invention.

Figure 5 Three-dimensional cross-sectional view of the shell system.

Figure 6 is a three-dimensional plan view of the shell system.

Figure 7 is a schematic diagram of the connection between the mobile flange and the bolts.

Figure 8 is a schematic diagram of the connection between the fixed flange and the bolts.

Figure 9 is a three-dimensional schematic diagram of the clinging system.

Figure 10 is a schematic diagram of a three-dimensional explosion of the clinging system.

Fig. 11 is a three-dimensional plane sectional view of the stepped cylinder.

Fig. 12 is a three-dimensional plane sectional view of the clasping cylinder.

Figure 13 is a schematic diagram of the installation of the tight column and the trapezoidal block.

Figure 14 is a schematic diagram of installation of a single set of holding columns and holding blocks.

Fig. 15 is a three-dimensional sectional view of the clamping column and the clamping block.

Fig. 16 is an exploded schematic view of the holding block, the trapezoidal block and the positioning pin.

Fig. 17 is a three-dimensional plane entity diagram of a trapezoidal block.

Fig. 18 is a three-dimensional schematic diagram of the sealing system.

Fig. 19 is a three-dimensional sectional view of the moving ring.

Fig. 20 is a three-dimensional sectional view of the metal sealing ring.

Figure 21 is a schematic diagram of the connection between the pipe and the prefabricated flange.

1. Shell system, 2. Clamping system, 3. Sealing system, 4. Casing, 5. Prefabricated flange pipe; 11. Moving flange, 12. Fixed flange, 13. Ring protrusion, 14. Large stepped hole, 15. Medium stepped hole, 16. Small stepped hole; 21. Ladder tube, 22. Clamping tube, 23. Clamping column, 24. Trapezoidal block, 25. Locating pin, 26. Long through hole, 27 .Inner ladder; 31. Jacking bolts, 32. Moving ring, 33. Metal sealing ring, 34. Rubber gasket.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Referring to Fig. 1~Fig. 3, Fig. 21, an underwater pipeline connection flange is composed of a shell system 1, a holding system 2 and a sealing system 3, and its feature is: the inner surface of the shell system 1 is installed inside the left side There is a tightening system 2, a sealing system 3 is installed on the right side of the inner surface of the shell system 1, and a pipe 4 is in contact with the inner surface of the tightening system 2 and the sealing system 3. Its working principle is: turn the nut to make the movable flange 11 move axially along the direction of the fixed flange 12, the movable flange 11 moves axially to push the holding cylinder 22 to move axially, and the holding cylinder 22 moves axially so that The tightening cylinder 22 and the tightening column 23 have relative slippage, and the tightening column 23 has relatively slipped, so that the tightening column 23 radially protrudes and tightens the outer surface of the pipeline, and then realizes that the tightening column 23 radially hugs the pipeline purpose, and by applying different pretightening forces to the bolts, different radial holding forces can be obtained, thereby achieving the purpose of independently adjusting the radial holding force; screwing the jacking bolt 31, the jacking bolt 31 moves axially and then pushes the The moving ring 32 moves axially, and the moving ring 32 moves axially so that the metal sealing ring 33 is in close contact with the fixed flange 12. By adjusting the axial movement distance of the jacking bolt 31, the degree of pressure on the metal sealing ring 33 can be changed , so as to achieve the purpose of changing the size of the sealing force, and the size of the sealing force can be adjusted independently.

Referring to FIGS. 4 to 7 , the housing system 1 includes a movable flange 11 and a fixed flange 12 . The movable flange 11 is used to axially tighten the clamping cylinder 22 and form a sealed cavity with the casing. The movable flange 11 is in the shape of a hollow ring, and the left end of the ring is designed with evenly distributed regular hexagonal blind holes. The regular hexagonal blind holes are used to carry the counter torque of the bolts when the bolts are pre-tightened; The bolt head and the bottom surface of the positive six-deformation blind hole are designed with a circular through hole, and the bolt passes through the circular through hole to make the movable flange 11 and the fixed flange 12 form a bolt fastening connection. The inner side of the left end face of the mobile flange 11 is designed with a small through hole, which is used to install the jacking bolt 31; the polished rod of the jacking bolt 31 passes through the small through hole, and the bolt head of the jacking bolt 31 is connected to the movable flange 11. Close contact. The right end surface of the movable flange 11 is designed with a ring protrusion 13, which is used to insert into the stepped hole, so that the outer surface of the ring protrusion 13 is in contact with the inner surface of the stepped cylinder 21, thereby supporting the bending of the pipe. load.

Referring to FIG. 8 and FIG. 21 , the fixing flange 12 is used for installing the clamping system 2 and the sealing system 3 . The fixed flange 12 is in the shape of a hollow stepped shaft, and the inner surface of the fixed flange 12 is designed with a large stepped hole 14 , a middle stepped hole 15 and a small stepped hole 16 . The large stepped hole 14 is used for installing the clamping system 2 , the middle stepped hole 15 is used for installing the sealing system 3 , and the small stepped hole 16 is used for installing the rubber gasket 34 . The end face of the middle step hole 15 is designed with a half H-shaped annular groove, and a metal sealing ring 33 is installed in the annular groove, thereby preventing oil and gas leakage. The middle part of the outer surface of the fixed flange 12 is designed with an outwardly protruding step, and the end face of the step is designed with uniformly distributed through holes. The end face of the through hole is in contact with a nut. Form a tight connection. The right end surface of the fixing flange 12 is designed with evenly distributed through holes, and the bolts pass through the through holes so that the fixing flange 12 and the prefabricated flange pipe 5 form a bolted connection.

Referring to FIGS. 9 to 11 , the tightening system 2 includes a stepped cylinder 21 , a tightening cylinder 22 , a tightening column 23 , a trapezoidal block 24 , and a positioning pin 25 . The stepped cylinder 21 is used for installing the clamping cylinder 22 and the tightening bolt 31 . The holding cylinder 22 is in the shape of a hollow stepped cylinder, and the left end surface of the stepped cylinder 21 is designed with a long through hole 26, which is used to install the jacking bolt 31; the end surface of the long through hole 26 is designed with a threaded hole, and the inner surface of the threaded hole The screw thread and the external thread of the tightening bolt 31 engage with each other, so that the tightening bolt 31 tightens the moving ring 32 when the tightening bolt 31 rotates. The right end surface of the stepped barrel 21 is designed with an inner step 27, which is used for positioning and installing the trapezoidal block 24; the left end surface of the inner step 27 is evenly distributed with blind holes, and a positioning pin 25 is installed in the blind hole, and the positioning pin 25 is used for installation. Trapezoidal block 24. The inner surface of the stepped cylinder 21 is in contact with the outer surface of the clinging cylinder 22, so as to bear the bending load of the pipeline.

Referring to FIG. 12 , the clamping cylinder 22 is used to push the radial movement of the clamping column 23 to realize the radial clamping function of the clamping column 23 . The holding cylinder 22 is hollow cylindrical, and the inner surface of the cylinder is designed with 12 wedge surfaces uniformly distributed along the circumferential direction. The wedge surfaces of the holding cylinder 22 are in contact with the holding column 23 and can slide relative to each other. When the tightening cylinder 22 moves axially, the tightening column 23 is stretched out radially, so that the tightening column 23 radially hugs the pipeline.

Referring to Figures 13-16, the clamping column 23 is used to tighten the pipeline radially and reduce damage to the pipeline. The tightening column is cylindrical, and the top of the holding column 23 is designed with a wedge surface. The wedge surface of the holding column 23 and the wedge surface of the holding cylinder 22 cooperate with each other to slide, and when the holding cylinder 22 moves axially, the holding The post 23 extends radially, so that the holding post 23 radially holds the pipeline tightly. The bottom end of the tight column 23 is designed with a ball, which passes through the trapezoidal block 24 and contacts the pipeline. The contact between the ball and the pipeline can reduce the damage of the tight column 23 to the outer surface of the pipeline. The middle part of the holding column 23 is designed with a stepped shaft, and the lower side of the stepped shaft is covered with a compression spring, which is used to overcome the gravity of the holding column 23, thereby preventing the holding column 23 from drooping due to gravity and hindering the installation of the pipeline; the compression spring The bottom is in contact with the trapezoidal block 24 .

Referring to FIG. 17 , the trapezoidal block 24 is used to install the holding post 23 and supports the compression spring. The inner surface of the trapezoidal block 24 is arc-shaped, and the outer surface of the trapezoidal block 24 is stepped. The bottom surface of each step is designed with a circular through hole. The right end face of the step block is designed with a blind hole, and the blind hole is used for installing the positioning pin 25 . The right end surface of the trapezoidal block 24 is in contact with the inner step 27 of the stepped barrel 21 , and the positioning pin 25 is installed in the blind hole of the trapezoidal block 24 and the stepped barrel 21 .

Referring to FIG. 18 , the sealing system 3 includes a tightening bolt 31 , a moving ring 32 , a metal sealing ring 33 , and a rubber gasket 34 . The tightening bolt 31 is used to adjust the sealing force of the metal sealing ring 33 . The bolt heads of the tightening bolts 31 are in contact with the movable flange 11, and the external threads of the tightening bolts 31 cooperate with the internal threads of the stepped sleeve. The right end surface of the tightening bolt 31 is in contact with the moving ring 32, and the moving ring 32 will be pushed to move axially by turning the set bolt, and the moving ring 32 will move axially so that the metal sealing ring 33 can seal the pipeline.

Referring to FIGS. 19-20 , the moving ring 32 is used to compress the metal sealing ring 33 . The right end surface of the moving ring 32 is designed with a half H-shaped annular groove, and a metal sealing ring 33 is installed in the annular groove. The metal sealing ring 33 is H-shaped, and the H-shaped metal sealing ring 33 can form two seals on the pipeline; the inner surface of the metal sealing ring 33 has an annular groove, and the annular groove is used to release the deformation process of the metal sealing ring 33 stress. The rubber gasket is the first seal of the device and is used to prevent oil and gas leakage in the pipeline; the rubber gasket 34 is installed between the pipeline and the small stepped hole 16 of the fixed flange 12 .

Claims (1)

1. An underwater pipeline connection flange, which is composed of a shell system (1), a holding system (2) and a sealing system (3), and is characterized in that: the inner surface of the shell system (1) is installed on the left side There is a tightening system (2), and a sealing system (3) is installed on the right side of the inner surface of the shell system (1); the inner surface of the tightening system (2) and the sealing system (3) is in contact with a pipe (4); The housing system (1) includes a movable flange (11) and a fixed flange (12); the movable flange (11) is in the shape of a hollow ring, and the left end of the ring is designed with regular hexagonal blind holes evenly distributed, The bolt head is installed in the regular hexagonal blind hole, and the bottom surface of the regular hexagonal blind hole is designed with a circular through hole, and the bolt passes through the circular through hole to make the movable flange (11) and the fixed flange (12) form a bolt fastened connection ;The inner side of the left end face of the movable flange (11) is designed with a small through hole, and the polished rod of the tightening bolt (31) passes through the small through hole, and the bolt head of the tightening bolt (31) is in close contact with the movable flange (11) ;The right end surface of the movable flange (11) is designed with a ring protrusion (13), and the outer surface of the ring protrusion (13) is in contact with the inner surface of the stepped cylinder (21); the inner surface of the fixed flange (12) Design the large stepped hole (14), the middle stepped hole (15) and the small stepped hole (16), the large stepped hole (14) is installed with a holding system (2), and the middle stepped hole (15) is equipped with a sealing system ( 3), a rubber gasket (34) is installed in the small stepped hole (16); an annular groove is designed on the end surface of the middle stepped hole (15), and a metal sealing ring (33) is installed in the annular groove; the fixed flange (12 ) in the middle of the outer surface is designed with a step protruding outward, and the end face of the step is designed with uniform through holes, and the bolts pass through the through holes and nuts to form a fast connection between the movable flange (11) and the fixed flange (12); The right end surface of the flange (12) is designed with evenly distributed through holes, and the bolts pass through the through holes to form a bolted connection between the fixed flange (12) and the prefabricated flange pipe (5); The clamping system (2) includes a stepped tube (21), a clamping tube (22), a clamping column (23), a trapezoidal block (24), and a positioning pin (25); the stepped tube (21) is a hollow stepped circle Cylindrical, the left end surface of the stepped cylinder (21) is designed with a long through hole (26), and the end surface of the long through hole (26) is designed with a threaded hole, and the internal thread of the threaded hole and the external thread of the jacking bolt (31) interlock; The right end surface of the stepped barrel (21) is designed with an inner step (27), and the left end surface of the inner step (27) is evenly distributed with blind holes, and positioning pins (25) are installed in the blind holes; the inner surface of the stepped barrel (21) is aligned with the The outer surface of the holding tube (22) contacts, and the inner surface of the holding tube (22) is designed with a wedge surface uniformly distributed along the circumference; the wedge surface of the holding tube (22) contacts the top of the holding column (23), and the holding Column (23) is installed in the support block; Hold tight column (23) is cylindrical, and the top of hold tightly column (23) is designed with wedge surface, the wedge surface of hold tightly column (23) and hold tightly tube (22) The wedge surfaces cooperate with each other to slide; the bottom end of the holding column (23) is designed with a ball, which passes through the trapezoidal block (24) and contacts the pipeline; the middle part of the holding column (23) is designed with a stepped shaft, and the stepped shaft The lower end face is contacted with a compression spring, and the bottom of the compression spring is in contact with a trapezoidal block (24); the inner surface of the trapezoidal block (24) is arc-shaped, and the outer surface of the trapezoidal block (24) is stepped, and the surface of each step is designed with Circular through hole, the circular through hole is inserted with holding post (23); The right end face of step block is designed with blind hole, is equipped with positioning pin (25) in the blind hole, the right end face of trapezoidal block (24) and The inner ladder (27) of the ladder barrel (21) contacts; The sealing system (3) includes a jacking bolt (31), a moving ring (32), a metal sealing ring (33), and a rubber gasket (34); the bolt head on the left side of the jacking bolt (31) and the moving method flange (11), the external thread of the jacking bolt (31) cooperates with the internal thread of the stepped sleeve, and the right end surface of the jacking bolt (31) is in contact with the moving ring (32); the right end surface of the moving ring (32) is designed with Annular groove, a metal sealing ring (33) is installed in the annular groove, and the metal sealing ring (33) is H-shaped; the inner surface of the metal sealing ring (33) has an annular groove; the rubber gasket (34) is installed on Between the pipe and the small stepped hole (16) of the fixed flange (12).