Throttling kill manifold with pressure adjusting function for offshore oil exploitation

Abstract

The invention discloses a throttling well killing manifold with a pressure adjusting function for offshore oil exploitation, and relates to the technical field of well killing manifolds, the throttling well killing manifold comprises a base, a four-way structure, a filtering device, a throttling device, an external connecting pipe, a liquid injection structure and a vibration reduction support, and the size of filtering holes of a filtering plate can be dynamically adjusted according to the content of gravel in oil gas; when the content of the gravel is high, the size of the filter holes is shrunk so as to achieve a finer filtering effect, and when the content of the gravel is low, the size of the filter holes is increased, the throughput of fluid is improved, pressure loss caused by increase of filter resistance is reduced, the service life of the filter screen is prolonged, and the throttling device can automatically adjust the opening degree of a throttling valve according to the pressure in a pipeline. When the pressure in the pipeline is sharply increased due to abnormal conditions, the throttle valve can be automatically closed to cut off a fluid channel of the pipeline, and meanwhile, the pressure relief device is started to release part of overhigh pressure, so that the pressure in the pipeline rapidly falls back to a safe range.

Description

Technical Field

[0001] The present invention relates to the technical field of kill manifolds, and specifically to a throttle kill manifold for offshore oil exploitation with a pressure regulation function. Background Art

[0002] The throttle kill manifold is an essential device for controlling well kicks and implementing oil and gas well pressure control technology. When the blowout preventer is closed, the throttle kill manifold uses the opening and closing of the throttle valve to control a certain casing pressure, so that the bottom hole pressure is always slightly greater than the formation pressure, and the throttle kill manifold prevents formation fluids from flowing into the well. In addition, when the throttle kill manifold is used for shutting in the well, the throttle manifold can be used to relieve pressure to achieve a soft shut-in. When the throttle kill manifold reaches a certain limit, the wellhead is discharged through the throttle kill manifold to protect the wellhead.

[0003] The prior art has defects: during the process of offshore oil exploitation, oil and gas usually contain impurities such as sediment and water, and sand and gravel are likely to damage the exploitation equipment, increasing the exploitation cost; when the pressure in the pipeline rises, it is difficult to adjust the pipeline pressure in time, and too high pressure will cause the pipeline to deform and leak, affecting normal operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a throttle kill manifold for offshore oil exploitation with a pressure regulation function to solve the problems raised in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: The throttle kill manifold includes a base, a four-way structure is installed on the base, a filtering device, a throttling device and an external connection pipe are sequentially installed on one side of the four-way structure, a liquid injection structure is installed at one end of the four-way structure, and damping brackets are installed at one ends of the filtering device, the throttling device, the external connection pipe and the liquid injection structure, and the damping brackets are installed on the base. During operation, oil and gas flow through the four-way structure into the filtering device, the filtering device filters and discharges impurities such as sand and gravel in the oil and gas, the filtered oil and gas enter the throttling device, the throttling device adjusts the pressure in the pipeline, and finally flows out through the external connection pipe, and the liquid injection structure is used to inject drilling fluid into the wellhead to maintain pressure balance.

[0006] The filtering device includes a filter pipe, one end of the filter pipe is installed on the damping bracket, the filter pipe is installed between the four-way structure and the throttling device, a first protective box is installed on the outer side of the filter pipe, a sand collecting pipe is installed on the filter pipe, a sand discharging pipe is installed on one side of the sand collecting pipe, a sand filtering device is installed in the filter pipe, the sand collecting pipe is located in the first protective box, and one end of the sand discharging pipe is installed with a recovery box.

[0007] The sand filtering device includes a first filter plate and a second filter plate. The first filter plate and the second filter plate are installed in the filter pipe. A first rotating shaft is rotatably connected to the first filter plate and the second filter plate. A first scraper, a drainage fan and a second scraper are installed on the first rotating shaft. The first scraper abuts against one end of the first filter plate. A sealing ring is rotatably connected to the other end of the first filter plate. A third filter plate is installed in the sealing ring. A sector gear is connected to the third filter plate. The second scraper abuts against one end of the second filter plate. When oil and gas flow into the filter pipe, large impurities such as sand and gravel in the oil and gas are blocked by the first filter plate, and small impurities such as dust are blocked by the second filter plate. The oil and gas drive the drainage fan to rotate, the drainage fan drives the first rotating shaft to rotate, the first rotating shaft drives the first scraper and the second scraper to rotate. The first scraper scrapes off the impurities on the surface of the first filter plate, and the second scraper scrapes off the impurities on the surface of the second filter plate. When the drainage fan rotates, a centrifugal force will be formed. Large impurities such as sand and gravel are thrown towards the pipe wall under the action of the centrifugal force and accumulate in the outer shell.

[0008] The sand collecting pipe includes an outer shell. The outer shell is installed on the filter pipe. A sand discharging pipe is installed on one side of the outer shell. A cylindrical slider is slidably connected inside the sand discharging pipe. A guide post is installed at one end of the cylindrical slider. A spring is installed on one side of the cylindrical slider. The other end of the spring is installed on the outer shell. The spring is sleeved on the guide post. A connecting post is installed on the guide post. A first connecting rod is rotatably connected to the connecting post. One end of the first connecting rod is rotatably connected to a second connecting rod. One end of the second connecting rod is rotatably connected to a second rotating shaft. One end of the second rotating shaft is rotatably connected to the outside of the outer shell. A first gear is installed at one end of the second rotating shaft. The first gear meshes with the sector gear. When sand and gravel accumulate in the outer shell, the sand and gravel will press the cylindrical slider to slide in the outer shell towards the direction close to the spring. The cylindrical slider drives the guide post to move, the guide post drives the connecting post to move, the connecting post drives the first connecting rod to rotate, the first connecting rod drives the second connecting rod to rotate, the second connecting rod drives the second rotating shaft to rotate, the second rotating shaft drives the first gear to rotate, the first gear drives the sector gear to rotate, and the sector gear drives the third filter plate and the sealing ring to rotate. Part of the filter holes of the third filter plate cover the filter holes of the first filter plate to achieve a more refined filtering effect. When the cylindrical slider is located below the sand discharging pipe, large impurities such as sand and gravel flow into the recycling box from the sand discharging pipe. When the large impurities such as sand and gravel decrease, the spring stretches and drives the cylindrical slider to slide in the outer shell towards the direction away from the spring. The cylindrical slider drives the guide post to move, the guide post drives the connecting post to move, the connecting post drives the first connecting rod to reverse, the first connecting rod drives the second connecting rod to reverse, the second connecting rod drives the second rotating shaft to reverse, the second rotating shaft drives the first gear to reverse, the first gear drives the sector gear to reverse, and the sector gear drives the third filter plate and the sealing ring to reverse, increasing the size of the filter holes of the first filter plate.

[0009] The throttling device includes a throttle pipe. One end of the throttle pipe is installed on a four-way structure, and a throttle valve is installed at the other end of the throttle pipe. One end of the throttle valve is installed on an external connecting pipe, and a second protective box is installed outside the throttle valve. A connecting pipe is installed on the throttle pipe, and a corrugated pipe is installed on the connecting pipe. A diaphragm is installed between the corrugated pipe and the connecting pipe. The inside of the corrugated pipe is filled with inert gas. One end of the corrugated pipe is installed with a first rack, a pressure regulating device is installed on one side of the first rack, a second rack is connected to one side of the first rack, and a pressure relief device is installed on one side of the second rack. The pressure regulating device and the pressure relief device are installed on the inner wall of the second protective box. When the pressure in the throttle pipe increases, the oil and gas will impact the diaphragm. The diaphragm is deformed under pressure and transmits the pressure to the inert gas, preventing the corrosive medium from directly contacting the corrugated pipe. The pressure in the corrugated pipe increases, and the corrugated pipe expands to drive the first rack to move away from the connecting pipe, and the first rack drives the second rack to move.

[0010] The pressure regulating device includes a fixing plate installed on the inner wall of the second protective box. A third rotating shaft is rotatably connected to the fixing plate. One end of the third rotating shaft rotates on the inner wall of the second protective box, and a first bevel gear is installed at the other end of the third rotating shaft. A second bevel gear is installed on the driving shaft of the throttle valve. The first bevel gear and the second bevel gear are meshed. A second gear is installed on the third rotating shaft, and the second gear meshes with the first rack. When the pressure in the throttle pipe increases, the first rack drives the second gear to rotate, the second gear drives the third rotating shaft to rotate, the third rotating shaft drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the driving shaft of the throttle valve to rotate, and the driving shaft drives the valve opening to decrease. The cross-sectional area through which the oil and gas pass shrinks, the flow rate decreases, and the pipeline pressure drops, keeping the oil and gas flow stable and ensuring that the pressure of the pipeline system is maintained at a stable and safe level.

[0011] The pressure relief device includes a fixed column, one end of which is installed on the inner wall of the second protective box. A third gear is rotatably connected to the fixed column, and a fourth gear is installed on one side of the third gear. The third gear meshes with the second rack. A fourth rotating shaft is rotatably connected to the inner wall of the second protective box, and a fifth gear is installed on the fourth rotating shaft. A belt is installed on the fourth gear and the fifth gear. A pressure relief pipe is installed on the throttle pipe, and a rotating plate is installed in the pressure relief pipe. A fifth rotating shaft is installed on the rotating plate, and the fifth rotating shaft is installed on the fourth rotating shaft. One end of the pressure relief pipe is installed with a buffer pipe. When an abnormal condition causes the pressure in the throttle pipe to rise sharply, at this time, the second rack meshes with the third gear, the second rack drives the third gear to rotate, the third gear drives the fourth gear to rotate, the fourth gear drives the belt to rotate, the belt drives the fifth gear to rotate, the fifth gear drives the fourth rotating shaft to rotate, the fourth rotating shaft drives the fifth rotating shaft to rotate, and the fifth rotating shaft drives the rotating plate to rotate. The high-pressure oil and gas flow out from the pressure relief pipe into the buffer pipe. The spiral pipe of the buffer pipe can reduce the impact force of the high-pressure oil and gas and reduce the impact on the base.

[0012] The filter hole positions of the third filter plate correspond to those of the first filter plate, and the filter hole size of the second filter plate is smaller than that of the first filter plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. The filtering device of the present invention can dynamically adjust the filter hole size of the filter plate according to the sand content in the oil and gas. When the sand content in the oil and gas is high, the filter hole size is reduced to achieve a more refined filtering effect, effectively intercepting larger particles, preventing sand from blocking the pipeline or causing wear to downstream equipment. When the sand content in the oil and gas is low, the filter hole size is increased, thereby increasing the fluid throughput, reducing the pressure loss caused by the increase in filter resistance, and also reducing the burden on the filtering medium, thus prolonging the service life of the filter screen;

[0015] 2. The throttling device of the present invention can automatically adjust the opening degree of the throttle valve according to the pressure in the pipeline. When the pipeline pressure is within the normal range, the device will automatically adjust the pipeline pressure to keep the fluid flow stable and ensure that the pressure of the pipeline system is maintained at a stable and safe level. When an abnormal condition causes the pressure in the pipeline to rise sharply, the throttle valve will automatically close to cut off the fluid passage of the pipeline, and at the same time, the pressure relief device will be activated to release part of the excessive pressure, so that the pipeline pressure quickly drops back to the safe range, thereby effectively preventing damage to the pipeline and related equipment caused by excessive pressure;

[0016] 3. The pressure regulation and filtration technology of the present invention adopts a pure mechanical structure without using electronic controls such as sensors, avoiding the failure problems caused by corrosion interference of electronic components under high-pressure deep-sea conditions. The failure rate under extreme environments is greatly reduced, and the operation is more stable and reliable. At the same time, the pure mechanical system has a simple structure and is easy to maintain, without the need for additional power support, and can ensure a rapid response to pressure changes at critical moments, timely adjust the filtration state, and protect the safety of pipelines and downstream equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the choke and kill manifold of the present invention;

[0018] Figure 2 is a schematic internal structure diagram of the filtration device of the present invention;

[0019] Figure 3 is a perspective view of the sand filtration device of the present invention;

[0020] Figure 4 is a schematic internal structure diagram of the sand collecting pipe of the present invention;

[0021] Figure 5 is a schematic internal structure diagram of the throttling device of the present invention Figure 1 ;

[0022] Figure 6 is a schematic internal structure diagram of the connecting pipe of the present invention;

[0023] Figure 7 is a schematic internal structure diagram of the throttling device of the present invention Figure 2 .

[0024] In the figure: 1, base; 2, four-way structure; 3, filtration device; 31, first protective box; 32, filter pipe; 33, sand filtration device; 331, first filter plate; 332, first scraper; 333, sealing ring; 334, first rotating shaft; 335, drainage fan; 336, second filter plate; 337, second scraper; 338, sector gear; 34, sand collecting pipe; 341, outer shell; 342, cylindrical slider; 343, guide post; 344, spring; 345, first connecting rod; 346, second connecting rod; 347, first gear; 35, sand discharge pipe; 4, throttling device; 41, second protective box; 42, throttle valve; 43, throttle pipe; 44, diaphragm; 45, bellows; 46, first rack; 47, second rack; 48, pressure regulating device; 481, fixing plate; 482, third rotating shaft; 483, second gear; 484, first bevel gear; 485, second bevel gear; 49, pressure relief device; 491, third gear; 492, fourth gear; 493, belt; 494, fifth gear; 495, pressure relief pipe; 496, buffer pipe; 5, external connecting pipe; 6, liquid injection structure; 7, vibration damping bracket. Detailed implementation mode

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment: As Figures 1-7 shown, the present invention provides a technical solution. The throttle kill manifold includes a base 1, on which a four-way structure 2 is installed. On one side of the four-way structure 2, a filtering device 3, a throttling device 4, and an external connecting pipe 5 are sequentially installed. At one end of the four-way structure 2, a liquid injection structure 6 is installed. One ends of the filtering device 3, the throttling device 4, the external connecting pipe 5, and the liquid injection structure 6 are installed with a vibration damping bracket 7, and the vibration damping bracket 7 is installed on the base 1. During operation, the oil and gas flow into the filtering device 3 through the four-way structure 2. The filtering device 3 filters and discharges impurities such as sand and gravel in the oil and gas. The filtered oil and gas enter the throttling device 4, and the throttling device 4 adjusts the pressure in the pipeline and finally flows out through the external connecting pipe 5. The liquid injection structure 6 is used to inject drilling fluid into the wellhead to maintain pressure balance.

[0027] The filtering device 3 includes a filtering pipe 32. One end of the filtering pipe 32 is installed on the vibration damping bracket 7. The filtering pipe 32 is installed between the four-way structure 2 and the throttling device 4. A first protective box 31 is installed on the outer side of the filtering pipe 32. A sand collecting pipe 34 is installed on the filtering pipe 32. A sand discharging pipe 35 is installed on one side of the sand collecting pipe 34. A sand filtering device 33 is installed in the filtering pipe 32. The sand collecting pipe 34 is located in the first protective box 31, and one end of the sand discharging pipe 35 is installed with a recovery box.

[0028] The sand filtering device 33 includes a first filter plate 331 and a second filter plate 336. The first filter plate 331 and the second filter plate 336 are installed in the filtering pipe 32. A first rotating shaft 334 is rotatably connected to the first filter plate 331 and the second filter plate 336. A first scraping plate 332, a liquid discharging fan 335, and a second scraping plate 337 are installed on the first rotating shaft 334. The first scraping plate 332 abuts against one end of the first filter plate 331. A sealing ring 333 is rotatably connected to the other end of the first filter plate 331. A third filter plate is installed in the sealing ring 333. A sector gear 338 is connected to the third filter plate. The second scraping plate 337 abuts against one end of the second filter plate 336. The filter hole positions of the third filter plate correspond to the filter hole positions of the first filter plate 331, and the filter hole size of the second filter plate 336 is smaller than the filter hole size of the first filter plate 331.

[0029] When oil and gas flow into the filter pipe 32, large impurities such as sand and gravel in the oil and gas are blocked by the first filter plate 331, and small impurities such as dust are blocked by the second filter plate 336. The oil and gas drive the drain fan 335 to rotate. The drain fan 335 drives the first rotating shaft 334 to rotate. The first rotating shaft 334 drives the first scraper 332 and the second scraper 337 to rotate. The first scraper 332 scrapes off the impurities on the surface of the first filter plate 331, and the second scraper 337 scrapes off the impurities on the surface of the second filter plate 336. When the drain fan 335 rotates, a centrifugal force will be formed. Large impurities such as sand and gravel are thrown towards the pipe wall under the action of the centrifugal force and accumulate in the housing 341.

[0030] The sand collecting pipe 34 includes a housing 341. The housing 341 is installed on the filter pipe 32. A drain pipe 35 is installed on one side of the housing 341. A cylindrical slider 342 is slidably connected inside the drain pipe 35. One end of the cylindrical slider 342 is installed with a guide post 343. One side of the cylindrical slider 342 is installed with a spring 344. The other end of the spring 344 is installed on the housing 341. The spring 344 is sleeved on the guide post 343. A connecting column is installed on the guide post 343. A first connecting rod 345 is rotatably connected to the connecting column. One end of the first connecting rod 345 is rotatably connected to a second connecting rod 346. One end of the second connecting rod 346 is rotatably connected to a second rotating shaft. One end of the second rotating shaft is rotatably connected to the outside of the housing 341. One end of the second rotating shaft is installed with a first gear 347. The first gear 347 meshes with the sector gear 338.

[0031] When sand and gravel accumulate in the housing 341, the sand and gravel will press the cylindrical slider 342 to slide in the housing 341 in the direction close to the spring 344. The cylindrical slider 342 drives the guide post 343 to move. The guide post 343 drives the connecting column to move. The connecting column drives the first connecting rod 345 to rotate. The first connecting rod 345 drives the second connecting rod 346 to rotate. The second connecting rod 346 drives the second rotating shaft to rotate. The second rotating shaft drives the first gear 347 to rotate. The first gear 347 drives the sector gear 338 to rotate. The sector gear 338 drives the third filter plate and the sealing ring 333 to rotate. The filter holes of the third filter plate cover a part of the filter holes of the first filter plate 331 to achieve a more refined filtering effect. When the cylindrical slider 342 is located below the drain pipe 35, large impurities such as sand and gravel flow into the recovery box from the drain pipe 35. When the large impurities such as sand and gravel decrease, the stretching of the spring 344 drives the cylindrical slider 342 to slide in the housing 341 in the direction away from the spring 344. The cylindrical slider 342 drives the guide post 343 to move. The guide post 343 drives the connecting column to move. The connecting column drives the first connecting rod 345 to reverse. The first connecting rod 345 drives the second connecting rod 346 to reverse. The second connecting rod 346 drives the second rotating shaft to reverse. The second rotating shaft drives the first gear 347 to reverse. The first gear 347 drives the sector gear 338 to reverse. The sector gear 338 drives the third filter plate and the sealing ring 333 to reverse, increasing the size of the filter holes of the first filter plate 331.

[0032] The throttling device 4 includes a throttle pipe 43. One end of the throttle pipe 43 is installed on the four-way structure 2, and a throttle valve 42 is installed at the other end of the throttle pipe 43. One end of the throttle valve 42 is installed on the external connection pipe 5, and a second protective box 41 is installed outside the throttle valve 42. A connecting pipe is installed on the throttle pipe 43, and a bellows 45 is installed on the connecting pipe. A diaphragm 44 is installed between the bellows 45 and the connecting pipe. The inside of the bellows 45 is filled with inert gas. One end of the bellows 45 is installed with a first rack 46. A pressure regulating device 48 is installed on one side of the first rack 46, and a second rack 47 is connected to one side of the first rack 46. A pressure relief device 49 is installed on one side of the second rack 47. The pressure regulating device 48 and the pressure relief device 49 are installed on the inner wall of the second protective box 41. When the pressure in the throttle pipe 43 increases, the oil and gas will impact the diaphragm 44. The diaphragm 44 is deformed under pressure and transmits the pressure to the inert gas, preventing the corrosive medium from directly contacting the bellows 45. The pressure in the bellows 45 increases, and the bellows 45 expands to drive the first rack 46 to move away from the connecting pipe. The first rack 46 drives the second rack 47 to move.

[0033] The pressure regulating device 48 includes a fixing plate 481. The fixing plate 481 is installed on the inner wall of the second protective box 41. A third rotating shaft 482 is rotatably connected to the fixing plate 481. One end of the third rotating shaft 482 rotates on the inner wall of the second protective box 41, and a first bevel gear 484 is installed at the other end of the third rotating shaft 482. A second bevel gear 485 is installed on the driving shaft of the throttle valve 42. The first bevel gear 484 and the second bevel gear 485 are meshed. A second gear 483 is installed on the third rotating shaft 482, and the second gear 483 is meshed with the first rack 46. When the pressure in the throttle pipe 43 increases, the first rack 46 drives the second gear 483 to rotate. The second gear 483 drives the third rotating shaft 482 to rotate. The third rotating shaft 482 drives the first bevel gear 484 to rotate. The first bevel gear 484 drives the second bevel gear 485 to rotate. The second bevel gear 485 drives the driving shaft of the throttle valve 42 to rotate. The driving shaft drives the valve opening to decrease. The cross-sectional area through which the oil and gas pass shrinks, the flow rate decreases, and the pipeline pressure drops back, keeping the oil and gas flow stable and ensuring that the pressure of the pipeline system is maintained at a stable and safe level.

[0034] The pressure relief device 49 includes a fixed column. One end of the fixed column is installed on the inner wall of the second protective box 41. A third gear 491 is rotatably connected to the fixed column. A fourth gear 492 is installed on one side of the third gear 491. The third gear 491 meshes with the second rack 47. A fourth rotating shaft is rotatably connected to the inner wall of the second protective box 41. A fifth gear 494 is installed on the fourth rotating shaft. A belt 493 is installed on the fourth gear 492 and the fifth gear 494. A pressure relief pipe 495 is installed on the throttle pipe 43. A rotating plate is installed in the pressure relief pipe 495. A fifth rotating shaft is installed on the rotating plate. The fifth rotating shaft is installed on the fourth rotating shaft. One end of the pressure relief pipe 495 is installed with a buffer pipe 496.

[0035] When an abnormal condition causes the pressure in the throttle pipe 43 to rise sharply, at this time, the second rack 47 meshes with the third gear 491. The second rack 47 drives the third gear 491 to rotate. The third gear 491 drives the fourth gear 492 to rotate. The fourth gear 492 drives the belt 493 to rotate. The belt 493 drives the fifth gear 494 to rotate. The fifth gear 494 drives the fourth rotating shaft to rotate. The fourth rotating shaft drives the fifth rotating shaft to rotate. The fifth rotating shaft drives the rotating plate to rotate. The high-pressure oil and gas flow out from the pressure relief pipe 495 into the buffer pipe 496. The spiral pipe of the buffer pipe 496 can reduce the impact force of the high-pressure oil and gas and reduce the impact on the base 1.

[0036] The working principle of the present invention:

[0037] During operation, the oil and gas flow into the filter pipe 32 through the four-way structure 2. Large impurities such as sand and gravel in the oil and gas are blocked by the first filter plate 331. Small impurities such as dust are blocked by the second filter plate 336. The oil and gas drive the drain fan 335 to rotate. The drain fan 335 drives the first rotating shaft 334 to rotate. The first rotating shaft 334 drives the first scraper 332 and the second scraper 337 to rotate. The first scraper 332 scrapes the impurities on the surface of the first filter plate 331. The second scraper 337 scrapes the impurities on the surface of the second filter plate 336. When the drain fan 335 rotates, a centrifugal force will be formed. Large impurities such as sand and gravel are thrown towards the pipe wall under the action of the centrifugal force and accumulate in the outer shell 341.

[0038] When sand and gravel accumulate in the outer shell 341, the sand and gravel will press the cylindrical slider 342 to slide in the outer shell 341 towards the direction close to the spring 344. The cylindrical slider 342 drives the guide post 343 to move, the guide post 343 drives the connecting post to move, the connecting post drives the first connecting rod 345 to rotate, the first connecting rod 345 drives the second connecting rod 346 to rotate, the second connecting rod 346 drives the second rotating shaft to rotate, the second rotating shaft drives the first gear 347 to rotate, the first gear 347 drives the sector gear 338 to rotate, the sector gear 338 drives the third filter plate and the sealing ring 333 to rotate, and the filter holes of the third filter plate cover a part of the filter holes of the first filter plate 331 to achieve a more refined filtering effect. When the cylindrical slider 342 is located below the sand discharge pipe 35, large impurities such as sand and gravel flow into the recovery box from the sand discharge pipe 35. When the large impurities such as sand and gravel decrease, the spring 344 stretches and drives the cylindrical slider 342 to slide in the outer shell 341 towards the direction away from the spring 344. The cylindrical slider 342 drives the guide post 343 to move, the guide post 343 drives the connecting post to move, the connecting post drives the first connecting rod 345 to reverse, the first connecting rod 345 drives the second connecting rod 346 to reverse, the second connecting rod 346 drives the second rotating shaft to reverse, the second rotating shaft drives the first gear 347 to reverse, the first gear 347 drives the sector gear 338 to reverse, and the sector gear 338 drives the third filter plate and the sealing ring 333 to reverse, increasing the size of the filter holes of the first filter plate 331.

[0039] The filtered oil and gas enter the throttle pipe 43. When the pressure in the throttle pipe 43 increases, the oil and gas will impact the diaphragm 44. The diaphragm 44 is deformed under pressure and transmits the pressure to the inert gas, avoiding direct contact between the corrosive medium and the bellows 45. The pressure in the bellows 45 increases, and the bellows 45 expands and drives the first rack 46 to move away from the connecting pipe. The first rack 46 drives the second rack 47 to move, the first rack 46 drives the second gear 483 to rotate, the second gear 483 drives the third rotating shaft 482 to rotate, the third rotating shaft 482 drives the first bevel gear 484 to rotate, the first bevel gear 484 drives the second bevel gear 485 to rotate, the second bevel gear 485 drives the drive shaft of the throttle valve 42 to rotate, and the drive shaft drives the valve opening to decrease. The cross-sectional area through which the oil and gas pass shrinks, the flow rate decreases, and the pipeline pressure drops, keeping the oil and gas flow stable and ensuring that the pressure of the pipeline system is maintained at a stable and safe level.

[0040] When an abnormal condition occurs and causes the pressure in the throttle pipe 43 to rise sharply, at this time, the second rack 47 meshes with the third gear 491. The second rack 47 drives the third gear 491 to rotate, the third gear 491 drives the fourth gear 492 to rotate, the fourth gear 492 drives the belt 493 to rotate, the belt 493 drives the fifth gear 494 to rotate, the fifth gear 494 drives the fourth rotating shaft to rotate, the fourth rotating shaft drives the fifth rotating shaft to rotate, and the fifth rotating shaft drives the rotating plate to rotate. The high-pressure oil and gas flows out from the pressure relief pipe 495 into the buffer pipe 496. The spiral pipe of the buffer pipe 496 can reduce the impact force of the high-pressure oil and gas and reduce the impact on the base 1. After the high-pressure oil and gas flows out, the pressure in the pipe quickly drops back to the safe range, effectively preventing damage to the pipe and related equipment caused by excessive pressure. The oil and gas flows out from the outer connection pipe 5 after passing through the throttling device 4.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A throttling and well-killing manifold for offshore oil mining with pressure regulating function, characterized in that: The throttling well-killing manifold comprises a base (1), a four-way structure (2) is installed on the base (1), a filtering device (3), a throttling device (4) and an external pipe (5) are installed in sequence on one side of the four-way structure (2), a liquid injection structure (6) is installed on one end of the four-way structure (2), a vibration-damping bracket (7) is installed on one end of the filtering device (3), the throttling device (4), the external pipe (5) and the liquid injection structure (6), and the vibration-damping bracket (7) is installed on the base (1).

2. A throttling and well-killing manifold for offshore oil mining with pressure regulating function according to claim 1, characterized in that: The filtering device (3) comprises a filtering tube (32), one end of which is mounted on a vibration-damping bracket (7), the filtering tube (32) is mounted between a four-way structure (2) and a throttling device (4), a first protective box (31) is mounted on the outer side of the filtering tube (32), a sand collecting tube (34) is mounted on the filtering tube (32), a sand discharge tube (35) is mounted on one side of the sand collecting tube (34), a sand filtering device (33) is mounted in the filtering tube (32), the sand collecting tube (34) is located in the first protective box (31), and a recovery box is mounted on one end of the sand discharge tube (35).

3. A throttling and well-killing manifold for offshore oil mining with pressure regulating function according to claim 2, characterized in that: The sand filtering device (33) comprises a first filter plate (331) and a second filter plate (336). The first filter plate (331) and the second filter plate (336) are installed in the filter tube (32). The first filter plate (331) and the second filter plate (336) are rotatably connected with a first rotating shaft (334). The first rotating shaft (334) is equipped with a first scraper (332), a liquid discharge fan (335) and a second scraper (337). The first scraper (332) abuts against one end of the first filter plate (331). The other end of the first filter plate (331) is rotatably connected with a sealing ring (333). A third filter plate is installed in the sealing ring (333). The third filter plate is connected with a fan gear (338). The second scraper (337) abuts against one end of the second filter plate (336).

4. A throttling and well-killing manifold for offshore oil mining with pressure regulating function according to claim 3, characterized in that: The sand collecting pipe (34) comprises a shell (341), the shell (341) is mounted on the filter tube (32), the sand discharging pipe (35) is mounted on one side of the shell (341), a cylindrical slider (342) is slidably connected inside the sand discharging pipe (35), one end of the cylindrical slider (342) is mounted with a guide column (343), one side of the cylindrical slider (342) is mounted with a spring (344), the other end of the spring (344) is mounted on the shell (341), and the spring (344) is sleeved The guide column (343) is connected to a connecting column, and a first connecting rod (345) is rotatably connected to the connecting column. One end of the first connecting rod (345) is rotatably connected to a second connecting rod (346), and one end of the second connecting rod (346) is rotatably connected to a second rotating shaft. One end of the second rotating shaft is rotatably connected to the outside of the housing (341), and one end of the second rotating shaft is installed with a first gear (347), which is meshed with the fan gear (338).

5. A throttling and well-killing manifold for offshore oil mining with pressure regulating function according to claim 4, characterized in that: The throttling device (4) comprises a throttling tube (43), one end of which is mounted on the four-way structure (2), the other end of which is mounted with a throttling valve (42), one end of which is mounted on an external pipe (5), a second protective box (41) is mounted on the outer side of the throttling valve (42), a connecting pipe is mounted on the throttling tube (43), a bellows (45) is mounted on the connecting pipe, and a connection between the bellows (45) and the connecting pipe is formed. A diaphragm (44) is installed between the bellows (45), the interior of the bellows (45) is filled with inert gas, a first rack (46) is installed at one end of the bellows (45), a pressure regulating device (48) is installed on one side of the first rack (46), a second rack (47) is connected to one side of the first rack (46), a pressure relief device (49) is installed on one side of the second rack (47), and the pressure regulating device (48) and the pressure relief device (49) are installed on the inner wall of the second protective box (41).

6. A throttling and well-killing manifold for offshore oil mining with pressure regulating function according to claim 5, characterized in that: The pressure regulating device (48) includes a fixed plate (481), which is installed on the inner wall of the second protective box (41); a third rotating shaft (482) is rotatably connected to the fixed plate (481); one end of the third rotating shaft (482) rotates on the inner wall of the second protective box (41); a first bevel gear (484) is installed on the other end of the third rotating shaft (482); a second bevel gear (485) is installed on the driving shaft of the throttle valve (42); the first bevel gear (484) and the second bevel gear (485) are meshed; a second gear (483) is installed on the third rotating shaft (482); the second gear (483) is meshed with the first rack (46).

7. A throttling and well-killing manifold with pressure regulating function for offshore oil mining according to claim 6, characterized in that: The pressure relief device (49) includes a fixed column, one end of which is mounted on the inner wall of the second protective box (41), a third gear (491) is rotatably connected to the fixed column, a fourth gear (492) is mounted on one side of the third gear (491), the third gear (491) is meshed with the second rack (47), a fourth rotating shaft is rotatably connected to the inner wall of the second protective box (41), a fifth gear (494) is mounted on the fourth rotating shaft, a belt (493) is mounted on the fourth gear (492) and the fifth gear (494), a pressure relief pipe (495) is mounted on the throttling pipe (43), a rotating plate is mounted inside the pressure relief pipe (495), a fifth rotating shaft is mounted on the rotating plate, the fifth rotating shaft is mounted on the fourth rotating shaft, and a buffer pipe (496) is mounted on one end of the pressure relief pipe (495).

8. A throttling and well-killing manifold for offshore oil mining with pressure regulating function according to claim 7, characterized in that: The position of the filter holes of the third filter plate corresponds to the position of the filter holes of the first filter plate (331), and the size of the filter holes of the second filter plate (336) is smaller than the size of the filter holes of the first filter plate (331).

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