CN107654775B - An underwater pipeline connection flange - Google Patents

Abstract

The invention relates to an underwater pipeline connection flange, which is composed of a shell system, a holding system and a sealing system. Pipes are installed inside. Working principle: screw the nut to move the moving flange axially, the moving flange moves axially and then pushes the clamping cylinder to move axially, the clamping cylinder axially causes the clamping column to extend radially, and the clamping column extends radially So as to hold the pipeline tightly; by screwing the top tightening bolt, the pressure degree of the metal sealing ring can be changed, so as to achieve the purpose of changing the sealing force. Compared with the prior art, the present invention can independently adjust the radial holding force and sealing pressure of the device, and can quickly install flanges for the subsea pipeline under water, so as to realize the rapid repair connection of the subsea pipeline, thereby shortening the repair cycle of the subsea pipeline. 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 emergency repair equipment for oil and natural gas submarine pipelines, 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 carried out exploration and exploitation of offshore oil and gas resources, and the exploration and exploitation of marine oil and gas resources has gradually become the main trend of domestic and foreign oil and gas industry development. In addition, with the sustained and rapid growth of my country's economy, insufficient supply of oil and gas resources will become the main contradiction that hinders economic development. In order to increase the possession of oil and gas resources, the exploration and exploitation of offshore oil and gas has become the strategic focus of my country's sustainable energy development.

Submarine pipelines undertake important tasks such as liquid production from underwater oil and gas wells, transportation of submarine crude oil, natural gas and associated gas medium. Therefore, the safe and stable operation of submarine pipelines is of great significance to the development and utilization of offshore oil and gas resources. Due to the seabed operating conditions and the special environment of the surrounding seawater, the submarine pipelines have risks such as fatigue damage, geological disaster damage, corrosion damage, ship anchor damage, and third-party damage in marine exploration and development. 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 oilfield production.

If the submarine pipeline is damaged or damaged during operation, it needs to be repaired or strengthened. At present, there are three main subsea pipeline repair technologies: pipe plug plugging, composite material reinforcement and underwater pipe section replacement. Among them, the composite material reinforcement technology, such as epoxy resin injection 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, the on-site material self-made and the underwater operation process are complex, all of which are It is not conducive to the rapid repair of submarine pipelines. The pipeline plugging and repairing technology adopts mechanical plugging, which has the advantages of simple implementation and short operation cycle. It can be used for pipeline leakage caused by corrosion, base metal defects, cracks, etc. in the Bohai Sea. When there is a large deformation and the submarine pipeline is in a deep or deep water area, this technology is difficult to achieve effective plugging and repairing. The subsea pipe section replacement and repair technology is characterized by a wide range of applications, which can complete various forms of subsea pipeline damage repairs such as corrosion or fracture; subsea pipe section replacement is divided into: subsea pipeline welding and replacement technology and subsea pipeline connector connection technology. The subsea pipeline welding replacement technology has many processes, 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 subsea pipeline connector technology can solve the above problems, but the disadvantage is that The production of repairing mechanical connectors, a key spare part, and its repairing operation devices and operation procedures have always been in the hands of foreign professional companies, and there are few domestic corresponding equipment and technologies. In addition, the equipment for replacing subsea pipe sections at home and abroad is mainly based on connectors. For example, Patent No. CN201620156196.8 discloses a new type of subsea pipeline connector, and Patent No. CN201510054118.7 discloses a subsea pipeline clamp repair connector , Patent No. CN201621328659.0 discloses a plugging device for submarine pipelines and a split type plugging fixture for submarine pipelines, and Patent No. CN201610319504.9 is an adjustable deflection type quick repair connection device for submarine pipelines. The middle sealing force of the above device is determined by the pre-tightening force of the bolts, and the bolts not only need to radially hold the pipeline, but also realize the connection between the flange end caps, so that the sealing force cannot be adjusted independently; If the bolt pre-tightening force is too small, the sealing force will be too small and the sealing force will not be enough to cause leakage. If the bolt pre-tightening force is too large, the service life of the sealing system will be reduced. Therefore, there is an urgent need to design a device in which the radial holding force and the sealing force can be independently adjusted.

SUMMARY 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 has a sealing force and radial holding force. The size can be adjusted independently, so as to realize the rapid repair and connection of subsea pipelines and shorten the repair cycle of subsea pipelines.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

An underwater pipeline connection flange is composed of a shell system 1, a holding system 2 and a sealing system 3, and is characterized in that: a 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 on the right side of the inner surface; the inner surfaces of the clamping system 2 and the sealing system 3 are respectively in contact with the pipeline 4;

The housing system 1 includes a movable flange 11 and a fixed flange 12; the movable flange 11 is in the form of a hollow circular ring, and the left end surface of the circular ring is designed with regular hexagonal blind holes, which are installed in the regular hexagonal blind holes. The bolt head, the bottom surface of the hexagonal blind hole is designed with a circular through hole, and the bolt passes through the circular through hole to form a bolted connection between the movable flange 11 and the fixed flange 12; the inner side of the left end face of the movable flange 11 is designed with a small Through hole, the small through hole has the smooth rod of the jacking bolt 31 passing through, and the bolt head of the jacking bolt 31 is in close contact with the moving flange 11; the right end face of the moving flange 11 is designed with an annular protrusion 13, which The outer surface of the lift 13 is in contact with the inner surface of the stepped cylinder 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. The sealing system 3 is installed in the stepped hole 15, and the rubber gasket 34 is installed in the small stepped hole 16; the end face of the middle stepped hole 15 is designed with a first annular groove, and a metal sealing ring 33 is installed in the first annular groove; the fixing method The middle part of the outer surface of the flange 12 is designed with a step extending outward, and the end face of the step is designed with uniformly distributed first through holes, and the bolts pass through the first through holes and nuts to form a tight connection between the movable flange 11 and the fixed flange 12; The right end face of the fixed flange 12 is designed with uniformly distributed second through holes, and another bolt passes through the second through holes to form a bolted connection between the fixed flange 12 and the prefabricated flange pipeline 5;

The holding system 2 includes a stepped cylinder 21, a holding cylinder 22, a holding column 23, a trapezoidal block 24, and a positioning pin 25; 26. The end face of the long through hole 26 is designed with a threaded hole, and the inner thread of the threaded hole and the outer thread of the tightening bolt 31 are mutually engaged; , a positioning pin 25 is installed in the blind hole; the inner surface of the stepped cylinder 21 is in contact with the outer surface of the clamping cylinder 22, and the inner surface of the clamping cylinder 22 is designed with a wedge surface uniformly distributed along the circumferential direction; the wedge surface of the clamping cylinder 22 In contact with the top of the holding column 23, the holding column 23 is installed in the trapezoidal block 24; The wedge surfaces of the clasps slide with each other; 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 bottom of the compression 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 vertical through hole, and the vertical through hole is inserted There is a holding column 23; the right end face of the step block is designed with a blind hole, and a positioning pin 25 is fitted 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 cylinder 21;

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 is in contact with the moving flange 11, and the external thread of the jacking bolt 31 is The inner thread of the stepped cylinder 21 is matched, and the right end face of the jacking bolt 31 is in contact with the moving ring 32; the right end face of the moving ring 32 is designed with a second annular groove, and a metal sealing ring 33 is installed in the second annular groove. The metal sealing ring 33 is H-shaped; the inner surface of the metal sealing ring 33 is provided with a third annular groove;

Compared with the prior art, the beneficial effects of the present invention are: (1) Quickly make a flange for the replacement section of the submarine pipeline, so as to realize the quick connection of the replacement section of the pipeline; (2) The size of the sealing force of the device can be independently adjusted, and then To ensure the safety and reliability of the flange connection and sealing; (3) The radial clamping force of the device on the pipeline can also be adjusted independently, so that the adjustment of the radial clamping force and the adjustment of the sealing force are separated, ensuring that the device The radial holding capacity of the pipe; (4) the ball head holding column of the device is in contact with the pipe, thereby reducing the holding damage of the holding system to the pipe.

Description of drawings

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

Figure 2 is a three-dimensional schematic view of the present invention.

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

Figure 4 is a three-dimensional plan cross-sectional view of the present invention.

5 is a three-dimensional cross-sectional view of the housing system.

FIG. 6 is a three-dimensional plan cross-sectional view of the housing system.

Figure 7 Schematic diagram of the connection of the moving flange and the bolts.

Figure 8 is a schematic diagram of the connection between the fixing flange and the bolt.

FIG. 9 is a three-dimensional schematic diagram of the holding system.

Figure 10 Schematic diagram of the three-dimensional explosion of the holding system.

Figure 11. A three-dimensional plane cross-sectional view of a stepped cylinder.

FIG. 12 is a three-dimensional plane cross-sectional view of the holding cylinder.

Figure 13 Schematic diagram of the installation of the holding column and the trapezoidal block.

Figure 14 Schematic diagram of the installation of a single group of holding columns and holding blocks.

Figure 15 is a three-dimensional cross-sectional view of the holding column and the holding block.

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

Figure 17 is a three-dimensional planar solid view of a trapezoidal block.

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

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

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

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

1. Shell system, 2. Clamping system, 3. Sealing system, 4. Sleeve, 5. Prefabricated flanged pipe; 11. Moving flange, 12. Fixed flange, 13. Ring protrusion, 14. Large step hole, 15. Middle step hole, 16. Small step hole; 21. Step cylinder, 22. Hold cylinder, 23. Hold column, 24. Trapezoid block, 25. Positioning pin, 26. Long through hole, 27 .Inner step; 31. Top tightening bolt, 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 Figures 1 to 3 and Figure 21, an underwater pipeline connection flange 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 holding system 2, a sealing system 3 is installed on the right side of the inner surface of the housing system 1, and a pipe 4 is in contact with the inner surface of the holding system 2 and the sealing system 3. Its working principle is: screw the nut to make the moving flange 11 move axially in the direction of the fixed flange 12, the moving flange 11 moves axially to push the clamping cylinder 22 to move axially, and the clamping cylinder 22 moves axially to make the clamping cylinder 22 move axially. The holding cylinder 22 and the holding column 23 slip relative to each other, and the holding column 23 relatively slips so that the holding column 23 radially protrudes from the outer surface of the tight pipe, thereby realizing the radially holding the pipe by the holding column 23. and applying different pre-tightening forces to the bolts, different radial holding forces can be obtained, so as to achieve the purpose of independently adjusting the radial holding forces; screw the jacking bolts 31, and the jacking bolts 31 move axially to push 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 pressure degree of 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.

4 to 7 , the housing system 1 includes a movable flange 11 and a fixed flange 12 . The moving flange 11 is used for axially pressing against the holding cylinder 22, and forms a sealed cavity with the housing. The movable flange 11 is in the shape of a hollow ring, and the left end face of the ring is designed with regular hexagonal blind holes. The bolt head, 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 form a bolted connection between the moving flange 11 and the fixed flange 12 . A small through hole is designed on the inner side of the left end face of the moving flange 11, and the small through hole 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 moving flange 11. Close contact. The right end surface of the moving flange 11 is designed with a circular ring protrusion 13, which is used to insert into the stepped hole, so that the outer surface of the circular ring protrusion 13 contacts the inner surface of the stepped cylinder 21, so as to bear the bending of the pipeline load.

Referring to FIGS. 8 and 21 , the fixing flange 12 is used to install the holding 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 to install the holding system 2 , the middle stepped hole 15 is used to install the sealing system 3 , and the small stepped hole 16 is used to install the rubber gasket 34 . The end face of the middle stepped hole 15 is designed with a semi-H-shaped annular groove, and a metal sealing ring 33 is installed in the annular groove to prevent oil and gas leakage. The middle of the outer surface of the fixed flange 12 is designed with a step protruding outward, and the end face of the step is designed with evenly distributed through holes, the end face of the through hole is contacted with a nut, and the bolt passes through the through hole and the nut to make the movable flange 11 and the fixed flange 12. Form a tight connection. The right end face of the fixing flange 12 is designed with evenly distributed through holes, and bolts pass through the through holes to form a bolted connection between the fixing flange 12 and the prefabricated flange pipe 5 .

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

Referring to FIG. 12 , the tightening cylinder 22 is used to push the tightening column 23 to move radially, so as to realize the radial tightening function of the tightening column 23 . The holding cylinder 22 is in the shape of a hollow cylinder, and the inner surface of the cylinder is designed with 12 wedge surfaces evenly distributed along the circumferential direction. When the holding cylinder 22 moves axially, the holding column 23 radially extends, so that the holding column 23 radially holds the pipeline.

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

17, the trapezoidal block 24 is used to install the holding column 23 and support 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 circular through holes, which are used to install the holding column 23 . The right end face of the step block is designed with a blind hole, and the blind hole is used to install the positioning pin 25 . The right end face of the trapezoidal block 24 is in contact with the inner step 27 of the stepped cylinder 21 , and the positioning pin 25 is installed in the blind hole of the trapezoidal block 24 and the stepped cylinder 21 .

18 , the sealing system 3 includes a top bolt 31 , a moving ring 32 , a metal sealing ring 33 , and a rubber gasket 34 . The jacking bolt 31 is used to adjust the sealing force of the metal sealing ring 33 . The bolt head of the jacking bolt 31 is in contact with the moving flange 11 , and the outer thread of the jacking bolt 31 is matched with the inner thread of the stepped sleeve. The right end face of the jacking bolt 31 is in contact with the moving ring 32 , and the moving ring 32 is moved axially by screwing the tightening bolt, and the moving ring 32 moves axially so that the metal sealing ring 33 seals the pipeline.

19 to 20 , the moving ring 32 is used for pressing the metal sealing ring 33 . The right end surface of the moving ring 32 is designed with a semi-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 for the pipeline; the inner surface of the metal sealing ring 33 is provided with an annular groove, and the annular groove is used to release the part of the deformation process of the metal sealing ring 33 stress. The rubber gasket is the first seal of the device 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, consisting of a shell system (1), a holding system (2) and a sealing system (3), is characterized in that: the inner surface of the shell system (1) is installed on the left side There is a holding system (2), and a sealing system (3) is installed on the right side of the inner surface of the housing system (1); the inner surfaces of the holding system (2) and the sealing system (3) are respectively contacted with pipes (4) ; The housing system (1) includes a movable flange (11) and a fixed flange (12); the movable flange (11) is in the form of a hollow annular ring, and the left end face of the annular ring is designed with uniformly distributed regular hexagonal blind holes, A bolt head is installed in the regular hexagonal blind hole, 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 so that the movable flange (11) and the fixed flange (12) form bolt fastening. Connection; a small through hole is designed on the inner side of the left end face of the moving flange (11), and the polished rod of the jacking bolt (31) passes through the small through hole, and the bolt head of the jacking bolt (31) is tightly connected with the moving flange (11). Contact; the right end face of the moving flange (11) is designed with a circular protrusion (13), and the outer surface of the circular protrusion (13) is in contact with the inner surface of the stepped cylinder (21); the inner surface of the fixed flange (12) The large stepped hole (14), the middle stepped hole (15) and the small stepped hole (16) are designed on the surface. The large stepped hole (14) is installed with a holding system (2), and the middle stepped hole (15) is installed with a sealing system (3), a rubber gasket (34) is installed in the small stepped hole (16); a first annular groove is designed on the end face of the middle stepped hole (15), and a metal sealing ring (33) is installed in the first annular groove; The middle part of the outer surface of the fixed flange (12) is designed with a step protruding outward, and the end face of the step is designed with uniformly distributed first through holes, and the bolts pass through the first through holes and nuts to make the movable flange (11) and the fixed flange (12) form a tight connection; the right end face of the fixing flange (12) is designed with second through holes evenly distributed, and another bolt passes through the second through holes to connect the fixing flange (12) with the prefabricated flange pipe (5). ) to form a bolted connection; The holding system (2) comprises a stepped cylinder (21), a holding cylinder (22), a holding column (23), a trapezoidal block (24), and a positioning pin (25); the stepped cylinder (21) is a hollow stepped circle cylindrical, the left end face of the stepped cylinder (21) is designed with a long through hole (26), the end face of the long through hole (26) is designed with a threaded hole, and the inner thread of the threaded hole and the outer thread of the jacking bolt (31) are engaged with each other; An inner step (27) is designed on the right end face of the stepped cylinder (21), blind holes are evenly distributed on the left end face of the inner step (27), and a positioning pin (25) is fitted in the blind hole; The outer surface of the holding cylinder (22) is in contact, and the inner surface of the holding cylinder (22) is designed with a wedge surface evenly distributed along the circumferential direction; the wedge surface of the holding cylinder (22) contacts the top of the holding column (23), and the The column (23) is installed in the trapezoidal block (24); the holding column (23) is cylindrical, the top of the holding column (23) is designed with a wedge surface, and the wedge surface of the holding column (23) is connected with the holding cylinder (23). The wedge surfaces of 22) 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 of the holding column (23) is designed with a stepped shaft, The lower end surface of the stepped shaft is in contact with a compression spring, and the bottom of the compression spring is in contact with a trapezoidal block (24). Both are designed with vertical through holes, and the vertical through holes are inserted with holding posts (23). The right end face is in contact with the inner step (27) of the step cylinder (21); 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 The flange (11) is in contact, the outer thread of the jacking bolt (31) is matched with the inner thread of the stepped cylinder (21), and the right end face of the jacking bolt (31) is in contact with the moving ring (32); the right end face of the moving ring (32) A second annular groove is designed, a metal sealing ring (33) is installed in the second annular groove, and the metal sealing ring (33) is H-shaped; the inner surface of the metal sealing ring (33) is provided with a third annular groove; The rubber gasket (34) is installed between the pipe and the small stepped hole (16) of the fixing flange (12).