Throttling well killing manifold sand prevention device

Abstract

The invention relates to the technical field of oil and gas exploitation equipment, and discloses a throttling well killing manifold sand prevention device which comprises a sand prevention cylinder, a first flow guide pipe and a second flow guide pipe are arranged on the sand prevention cylinder and communicate with other assemblies of a well killing manifold, a sand discharging pipe is arranged on the sand prevention cylinder, a separation cylinder is rotationally installed in the sand prevention cylinder, and a sand discharging pipe is arranged on the separation cylinder. According to the well killing manifold, gravel in the fluid is filtered through the separation barrel and the filtering holes in the separation barrel, the sand prevention function of the well killing manifold is guaranteed, in the process that the gravel in the fluid is filtered through the separation barrel, the gravel in the fluid is filtered through the separation barrel, the separation barrel is not prone to falling off, and the separation barrel is not prone to falling off. Impact force generated after fluid enters the sand prevention barrel can drive the fan plates to rotate, so that the separation barrel is driven to rotate, the separation barrel has centrifugal force, the probability that sand blocks the filtering holes can be reduced through the centrifugal force, and the normal filtering function of the separation barrel is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas production equipment, and specifically to a sand prevention device for a choke and kill manifold. Background Technique

[0002] The kill manifold is an important part of the pressure control equipment for oil and gas wells. It is mainly used to control the well pressure and carry out the kill operation. Its main functions include: the kill operation, that is, when the well pressure rises abnormally, heavy drilling fluid is injected into the well through the kill manifold to restore the bottom hole pressure balance and prevent blowout; emergency treatment, that is, when a blowout gets out of control or a blowout catches fire, clear water or fire extinguishing agent is injected through the kill manifold to control the fire or dilute the combustible gas; pressure control, that is, during the drilling process, the wellhead pressure is adjusted in cooperation with the choke manifold to ensure the safety of the drilling operation.

[0003] During the use of the kill manifold, solid particles such as sand and cuttings are accompanied in the flowing fluid. These impurities will cause wear and blockage inside the manifold, and even cause equipment failures. Therefore, a sand prevention device is needed to filter and remove solid particles such as sand and cuttings to ensure the normal use of the kill manifold. Most of the current sand prevention devices are composed of components with filtering performance.

[0004] For example, in the prior art, there is a sand prevention device for a choke and kill manifold (publication number: CN111636856A). It uses a conical sand prevention orifice plate to preliminarily filter the sand, and a filtering component for secondary filtering. The effect of removing sand is achieved through two - stage filtering, effectively avoiding damage to the equipment downstream of the filtering component due to the impact and friction of impurities, and protecting the choke and kill manifold from being damaged. However, in the actual use process, the conical sand prevention orifice plate is easily blocked by sand during the preliminary filtering, hindering the normal flow of the fluid and affecting the normal use of the kill manifold. Summary of the Invention

[0005] The purpose of the present invention is to provide a sand prevention device for a choke and kill manifold to solve the problems raised in the above - mentioned background technique.

[0006] To solve the above - mentioned technical problems, the present invention is realized through the following technical solutions: The present invention is a sand prevention device for a throttle kill manifold, which includes a sand prevention cylinder. A first diversion pipe and a second diversion pipe are arranged on the sand prevention cylinder. The first diversion pipe and the second diversion pipe are connected to other components of the kill manifold. A sand discharge pipe is arranged on the sand prevention cylinder. A separation cylinder is rotatably installed in the sand prevention cylinder. The separation cylinder is provided with filter holes for filtering and separating impurities in the fluid. The second diversion pipe is in a connected state with the separation cylinder. A fan plate is arranged on the separation cylinder. The number of fan plates is set to be multiple and they are annularly distributed on the separation cylinder. The connection between the first diversion pipe and the sand prevention cylinder is inclined, and the inclination angle is between 45 degrees and 60 degrees, which is used to increase the impact force of the fluid on the fan plate and facilitate the rotation of the fan plate.

[0007] Further, an installation bracket is arranged on the sand prevention cylinder. The sand prevention cylinder is inclined, and the inclination angle is between 45 degrees and 60 degrees.

[0008] Further, the separation cylinder is divided into upper and lower chambers. The upper and lower chambers are connected through a calabash through groove, and the inner diameters of the upper and lower chambers are both larger than the inner diameter of the calabash through groove. The filter holes are connected to the lower chamber. An overflow port is opened on the separation cylinder. A first filter net is arranged in the overflow port. The overflow port is used to increase the fluid volume in the sand prevention cylinder when the filter holes are blocked, and assist in fluid filtration through the overflow port, reducing the increase in fluid pressure in the separation cylinder caused by the blockage of the filter holes.

[0009] Further, hook bars are installed on the fan plate. A rubber pad is arranged on the side of the fan plate where the hook bars are provided. The hook bars are used to increase the impact force of the fluid on the fan plate and improve the rotation efficiency of the fan plate. The setting of the rubber pad can reduce the damage caused by the impact of impurities in the fluid on the fan plate and ensure the service life of the fan plate.

[0010] Further, a frame cover is arranged on the sand prevention cylinder. A sealing disc is installed on the frame cover. The sealing disc is used to block one end of the separation cylinder. An air guide pipe is installed on the sealing disc. A branch pipe is installed on the air guide pipe. A resisting disc is slidably sleeved on the air guide pipe. The outer ring of the resisting disc contacts the inner wall of the separation cylinder. A corrugated air bag is installed on the resisting disc. The other side of the corrugated air bag is connected to the sealing disc. A return spring is sleeved on the air guide pipe. One end of the return spring is connected to the resisting disc, and the other end of the return spring is connected to the sealing disc. A three-way air supply pipe is arranged in the frame cover. One end of the three-way air supply pipe is connected to the corrugated air bag, one end of the three-way air supply pipe is connected to the air guide pipe, and one end of the three-way air supply pipe is connected to the inner cavity of the frame cover. An air vent is opened on the frame cover. A second filter net is arranged in the air vent.

[0011] Further, two one-way valves are arranged on the three-way air supply pipe. One one-way valve is located at the port of the three-way air supply pipe connected to the inner cavity of the frame cover, so that the air flow in the inner cavity of the frame cover can only flow into the three-way air supply pipe. The other one-way valve is located at the port of the three-way air supply pipe connected to the air guide pipe, so that the air flow entering the three-way air supply pipe can only flow into the air guide pipe.

[0012] Further, a positioning ring is arranged in the branch pipe. A piston sheet is arranged on the positioning ring. The piston sheet is used to block the inner ring of the positioning ring, thereby forming a blockage in the branch pipe. A reset assembly is arranged in the branch pipe and is used to make the piston sheet closely connected to the positioning ring when the piston sheet is not subject to external force.

[0013] Further, a water guiding through port is formed in the branch pipe. The water guiding through port is inclined. During the rotation of the separation cylinder, the fluid in the sand prevention cylinder will be driven to rotate, forming a vortex. Part of the fluid enters the branch pipe through the water guiding through port. And during this process, the fluid has an impact force. Under the action of this impact force, the fluid sprays out through the port of the branch pipe and acts on the filtering holes on the separation cylinder, completing the cleaning operation of the filtering holes.

[0014] Further, a corrugated buffer sleeve is arranged on the inner ring of the sand prevention cylinder. The outer ring of the corrugated buffer sleeve is cylindrical and is connected to the inner wall of the sand prevention cylinder. The inner ring is corrugated and a plurality of through grooves are formed in the inner ring. During the rotation of the fluid along with the separation cylinder, a centrifugal force will be formed. Under the action of the centrifugal force, the impurities in the fluid will move outwards and then collide with the corrugated buffer sleeve. The corrugated buffer sleeve buffers the collision force, reducing the damage to the sand prevention cylinder and at the same time reducing the noise generated by the collision.

[0015] Further, after the impact force formed when the fluid enters the sand prevention cylinder through the first diversion pipe acts on the fan plate, the fan plate rotates accordingly, which is used to buffer the impact force and reduce the damage caused by the fluid impact force to the separation cylinder, ensuring the service life of the separation cylinder.

[0016] The present invention has the following beneficial effects: (1). An independent sand prevention assembly is arranged on the kill line manifold of the present invention and is used to filter the sand and gravel in the fluid flowing in the kill line manifold. Specifically, the sand and gravel in the fluid are filtered through the separation cylinder and the filtering holes thereon, ensuring the sand prevention function of the kill line manifold. During the process of the separation cylinder filtering the sand and gravel in the fluid, the impact force of the fluid after entering the sand prevention cylinder will drive the fan plate to rotate, thereby driving the separation cylinder to rotate, so that the separation cylinder has a centrifugal force. Through this centrifugal force, the probability of the filtering holes being blocked by sand and gravel can be reduced, ensuring the normal filtering function of the separation cylinder.

[0017] (2). Hook bars and rubber pads are arranged on the fan plate of the present invention. Through the arrangement of the hook bars, a resistance can be given to the fluid when the fluid contacts the fan plate. Under the action of this resistance, the fan plate can receive the impact force of the fluid more comprehensively, making the fan plate in a strong rotating state. The rubber pad can form a buffer during the contact between the fluid and the fan plate, reducing the damage caused by the sand and gravel in the fluid to the collision of the fan plate, ensuring the service life of the fan plate. And when the fan plate is in a strong rotating state, the centrifugal force given to the separation cylinder is synchronously enhanced, increasing the effect of preventing the filtering holes from being blocked.

[0018] (3) When the filter holes of the present invention are blocked, the flow rate of the fluid passing through the filter holes decreases, and the flow rate inside the sand control cylinder increases. As the fluid volume increases, it will push the abutment plate upward, and then the gas in the corrugated airbag will enter the guide pipe through the three-way gas transmission pipe, and then be discharged through the branch pipe. The impurities in the filter holes are impacted by the impact of the gas, thereby reducing the probability of blockage of the filter holes.

[0019] (4) By providing a water guiding opening on the branch pipe, part of the fluid can enter the branch pipe through the water guiding opening and still have impact force during the rotation of the separation cylinder with the fluid. Under the action of the branch pipe, the impact force is concentrated, increasing the impact effect of the fluid on the filter holes, completing the impact cleaning of the filter holes, and forming a stronger impact under the combined action of the air flow in the guide pipe, improving the cleaning effect on the filter holes.

[0020] (5) In the present invention, by providing a corrugated buffer sleeve on the inner wall of the sand control cylinder, when the fluid rotates with the separation cylinder, some of the outward moving sand and gravel will contact the corrugated buffer sleeve. The impact of the sand and gravel can be buffered through the corrugated buffer sleeve, reducing the wear of the inner wall of the sand control cylinder by the sand and gravel, reducing the noise generated by the collision, and at the same time avoiding the reverse impact generated when the sand and gravel contact the inner wall of the sand control cylinder, preventing the sand and gravel from entering the filter holes due to the reverse impact force and causing blockage of the filter holes, further preventing the blockage of the filter holes, and at the same time increasing the comprehensiveness of the filter holes against blockage.

[0021] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional structure diagram of the sand control cylinder in the present invention; Figure 3 is a schematic connection structure diagram of the sand control cylinder and the first diversion pipe in the present invention; Figure 4 is a schematic connection structure diagram of the separation cylinder and the fan plate in the present invention; Figure 5 is a schematic structure diagram of the frame cover, the sealing disc, the corrugated airbag and the guide pipe in the present invention; Figure 6 Schematic diagram of the connection structure of the corrugated airbag, air guide pipe and three-way air delivery pipe in the present invention; Figure 7 Schematic cross-sectional structure diagram of the branch pipe in the present invention; Figure 8 Schematic diagram of the structure of the corrugated buffer sleeve in the present invention.

[0024] In the accompanying drawings, the list of components represented by each reference numeral is as follows: In the figure: 1, sand prevention cylinder; 2, installation bracket; 3, first diversion pipe; 4, second diversion pipe; 5, sand discharge pipe; 6, separation cylinder; 7, fan plate; 8, hook strip; 9, abutting disc; 10, corrugated airbag; 11, return spring; 12, air guide pipe; 13, three-way air delivery pipe; 14, frame cover; 15, branch pipe; 16, water guide port; 17, positioning ring; 18, piston piece; 19, shielding plate; 20, return assembly; 21, corrugated buffer sleeve; 22, sealing disc. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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] Please refer to Figures 1-8As shown in the figure, the present invention is a sand control device for a throttle kill manifold, which includes a sand control cylinder 1. A first diversion pipe 3 and a second diversion pipe 4 are arranged on the sand control cylinder 1. The first diversion pipe 3 and the second diversion pipe 4 are connected to other components of the kill manifold. A sand discharge pipe 5 is arranged on the sand control cylinder 1, and a valve is arranged on the sand discharge pipe 5 to control the discharge of sand and gravel. A separation cylinder 6 is rotatably installed in the sand control cylinder 1. Filter holes are arranged on the separation cylinder 6 to filter and separate impurities in the fluid. The second diversion pipe 4 is in a connected state with the separation cylinder 6; a fan plate 7 is arranged on the separation cylinder 6. The number of fan plates 7 is set to be multiple and is annularly distributed on the separation cylinder 6. The connection between the first diversion pipe 3 and the sand control cylinder 1 is inclined, and the inclination angle is between 45 degrees and 60 degrees to increase the impact force of the fluid on the fan plate 7 to facilitate the rotation of the fan plate 7. An installation bracket 2 is arranged on the sand control cylinder 1. The sand control cylinder 1 is inclined, and the inclination angle is between 45 degrees and 60 degrees. The separation cylinder 6 is divided into upper and lower chambers, and the upper and lower chambers are connected through a gourd through groove. The inner diameters of the upper and lower chambers are both larger than the inner diameter of the gourd through groove. The filter holes are connected to the lower chamber. An overflow port is opened on the separation cylinder 6, and a first filter screen is arranged in the overflow port. The overflow port is used to increase the fluid volume in the sand control cylinder 1 when the filter holes are blocked, and assist in fluid filtration through the overflow port to reduce the increase in fluid pressure in the separation cylinder 6 caused by the blockage of the filter holes. In the actual use process, a pressure sensor needs to be arranged on the sand control cylinder 1 to detect the fluid pressure in the sand control cylinder 1 and generate an alarm when the pressure is too high to remind the maintenance personnel to carry out maintenance. The function of setting the overflow port is to provide time for the maintenance personnel to come for maintenance. Hook bars 8 are installed on the fan plate 7, and a rubber pad is arranged on the side of the fan plate 7 where the hook bars 8 are arranged. The hook bars 8 are used to increase the impact force of the fluid on the fan plate 7 and improve the rotation efficiency of the fan plate 7. The setting of the rubber pad can reduce the damage caused by the impact of impurities in the fluid on the fan plate 7 and ensure the service life of the fan plate 7.

[0027] A frame cover 14 is provided on the sand control cylinder 1. The frame cover 14 is connected to the sand control cylinder 1 by threaded sealing. A sealing disc 22 is installed on the frame cover 14. The sealing disc 22 is used to block one end of the separation cylinder 6. An air guide pipe 12 is installed on the sealing disc 22. A branch pipe 15 is installed on the air guide pipe 12. A pressing disc 9 is slidably sleeved on the air guide pipe 12. The outer ring of the pressing disc 9 contacts the inner wall of the separation cylinder 6. A corrugated airbag 10 is installed on the pressing disc 9. The other side of the corrugated airbag 10 is connected to the sealing disc 22. A return spring 11 is sleeved on the air guide pipe 12. One end of the return spring 11 is connected to the pressing disc 9, and the other end of the return spring 11 is connected to the sealing disc 22. A three-way air delivery pipe 13 is arranged in the frame cover 14. One end of the three-way air delivery pipe 13 is communicated with the corrugated airbag 10, one end of the three-way air delivery pipe 13 is communicated with the air guide pipe 12, and one end of the three-way air delivery pipe 13 is communicated with the inner cavity of the frame cover 14. An air vent opening is formed on the frame cover 14. A second filter screen is arranged in the air vent opening. Two one-way valves are arranged on the three-way air delivery pipe 13. One of the one-way valves is located at the port of the three-way air delivery pipe 13 communicated with the inner cavity of the frame cover 14, so that the air flow in the inner cavity of the frame cover 14 can only flow into the three-way air delivery pipe 13. The other one-way valve is located at the port of the three-way air delivery pipe 13 communicated with the air guide pipe 12, so that the air flow entering the three-way air delivery pipe 13 can only flow into the air guide pipe 12.

[0028] A positioning ring 17 is arranged in the branch pipe 15. A piston sheet 18 is arranged on the positioning ring 17. The piston sheet 18 is used to block the inner ring of the positioning ring 17, thereby forming a blockage in the branch pipe 15. A reset assembly 20 is arranged in the branch pipe 15. The reset assembly 20 is specifically composed of a fixed cylinder, a telescopic rod and a telescopic spring. The fixed cylinder is installed in the branch pipe 15. The telescopic rod is slidably installed in the fixed cylinder, and the top end of the telescopic rod extends outside the fixed cylinder and is connected to the piston sheet 18. The bottom end of the telescopic rod is installed with a bottom plate. The telescopic spring is sleeved on the telescopic rod. One end of the telescopic spring is connected to the bottom plate, and the other end of the telescopic spring is connected to the fixed cylinder, so as to make the piston sheet 18 closely connected to the positioning ring 17 when the piston sheet 18 is not subjected to external force. A water guide opening 16 is formed on the branch pipe 15. The water guide opening 16 is inclined. During the rotation of the separation cylinder 6, the fluid in the sand control cylinder 1 will be driven to rotate, forming a vortex. Part of the fluid enters the branch pipe 15 through the water guide opening 16. And during this process, the fluid has an impact force. Under the action of this impact force, the fluid sprays out from the port of the branch pipe 15 and acts on the filter holes on the separation cylinder 6 to complete the cleaning operation of the filter holes. A shielding plate 19 is installed at the bottom of the piston sheet 18. The shielding plate 19 extends below the positioning ring 17 and is slidably connected to the positioning ring 17. The shielding plate 19 is used to block the side facing the water guide opening 16 when the gas is discharged through the positioning ring 17, so as to ensure that the gas flow will not affect the fluid from entering the water guide opening 16.

[0029] A corrugated buffer sleeve 21 is arranged on the inner ring of the sand control cylinder 1. Rubber sleeves are sleeved on both the inner wall and the outer wall of the corrugated buffer sleeve 21 to ensure buffering when it contacts with sand and gravel. The outer ring of the corrugated buffer sleeve 21 is cylindrical and is connected to the inner wall of the sand control cylinder 1. The inner ring is corrugated and is provided with a plurality of through grooves. During the rotation of the separation cylinder 6 with the fluid, a centrifugal force will be formed. Under the action of the centrifugal force, the impurities in the fluid will move outward and then collide with the corrugated buffer sleeve 21. The corrugated buffer sleeve 21 buffers the collision force, reduces the damage to the sand control cylinder 1, and at the same time reduces the noise generated by the collision. After the fluid enters the sand control cylinder 1 through the first guide pipe 3, the impact force formed acts on the fan plate 7, and the fan plate 7 rotates accordingly to buffer the impact force and reduce the damage caused by the fluid impact force to the separation cylinder 6, ensuring the service life of the separation cylinder 6.

[0030] During use, the sand control cylinder 1 is installed into the kill line manifold assembly through the first guide pipe 3 and the second guide pipe 4, which is convenient for filtering sand and gravel in the fluid flowing in the kill line manifold. Specifically, the fluid enters the sand control cylinder 1 through the first guide pipe 3, and the sand and gravel in the fluid can be filtered through the separation cylinder 6 and the filter holes thereon. The filtered fluid is discharged through the second guide pipe 4, thus completing the sand and gravel filtering operation of the fluid. After the fluid enters the sand control cylinder 1, an impact will be formed. The impact force of the fluid acts on the fan plate 7, pushing the fan plate 7 to rotate and driving the separation cylinder 6 to rotate accordingly. During the rotation of the separation cylinder 6, a centrifugal force will be formed. Under the action of the centrifugal force, the probability of sand and gravel blocking the filter holes can be reduced, ensuring the normal filtration of the separation cylinder 6. When the filter holes are blocked, the fluid volume in the sand control cylinder 1 increases, resulting in an increase in the pressure inside the sand control cylinder 1. In this case, the fluid will push the abutment plate 9 upward, causing the corrugated airbag 10 to contract. The air flow in the corrugated airbag 10 enters the guide pipe 12 through the three-way air delivery pipe 13 and is then discharged through the branch pipe 15. This can provide pressurization for the fluid entering the branch pipe 15 through the water guide opening 16, enabling the fluid to better impact the filter holes on the separation cylinder 6, further reducing the blockage of the filter holes. At the same time, during the rotation of the separation cylinder 6, it will drive the surrounding fluid to form rotation. The centrifugal force will throw the impurities in the fluid away from the outer wall of the separation cylinder 6. The corrugated buffer sleeve 21 can buffer the sand and gravel, reduce the wear on the inner wall of the sand control cylinder 1, and at the same time reduce the generation of collision noise. It also avoids the rebound force generated by the collision between the sand and gravel and the inner wall of the sand control cylinder 1 from making the sand and gravel rebound and impact into the filter holes to cause blockage of the filter holes, further ensuring the normal filtration of the separation cylinder 6 for sand and gravel.

[0031] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A sand control device for a choke and kill manifold, comprising a sand control cylinder (1). A first diversion pipe (3) and a second diversion pipe (4) are arranged on the sand control cylinder (1). The first diversion pipe (3) and the second diversion pipe (4) are communicated with other components of the kill manifold. A sand discharge pipe (5) is arranged on the sand control cylinder (1), and it is characterized in that: A separation cylinder (6) is rotatably installed in the sand control cylinder (1). The separation cylinder (6) is provided with filter holes for filtering and separating impurities in the fluid. The second diversion pipe (4) is in a communicated state with the separation cylinder (6); A fan plate (7) is arranged on the separation cylinder (6). The number of the fan plates (7) is set to be multiple and is annularly distributed on the separation cylinder (6). The connection part between the first diversion pipe (3) and the sand control cylinder (1) is inclined, and the inclination angle is between 45 degrees and 60 degrees, so as to increase the impact force of the fluid on the fan plate (7) and facilitate the rotation of the fan plate (7); The separation cylinder (6) is divided into upper and lower two chambers, and the upper and lower two chambers are communicated through a gourd through groove. The inner diameters of the upper and lower two chambers are both larger than the inner diameter of the gourd through groove. The filter holes are communicated with the lower chamber. An overflow port is arranged on the separation cylinder (6), and a first filter net is arranged in the overflow port. The overflow port is used for when the filter holes are blocked, the fluid volume in the sand control cylinder (1) increases, and the overflow port is used to assist the fluid filtration, so as to reduce the increase of the fluid pressure in the separation cylinder (6) caused by the blockage of the filter holes.

2. The sand prevention device for a throttle and kill manifold according to claim 1, characterized in that: An installation bracket (2) is arranged on the sand control cylinder (1). The sand control cylinder (1) is inclined, and the inclination angle is between 45 degrees and 60 degrees.

3. The sand prevention device for a choke and kill manifold according to claim 2, characterized in that: Hook bars (8) are installed on the fan plate (7). A rubber pad is arranged on one side of the fan plate (7) where the hook bars (8) are provided. The hook bars (8) are used to increase the impact force of the fluid on the fan plate (7) and improve the rotation efficiency of the fan plate (7). The setting of the rubber pad can reduce the damage caused by the impact of impurities in the fluid on the fan plate (7) and ensure the service life of the fan plate (7).

4. The sand control device for a throttle and kill manifold according to claim 3, characterized in that: A frame cover (14) is arranged on the sand control cylinder (1). A sealing disc (22) is installed on the frame cover (14). The sealing disc (22) is used to block one end of the separation cylinder (6). An air guide pipe (12) is installed on the sealing disc (22). A branch pipe (15) is installed on the air guide pipe (12). A resisting disc (9) is slidably sleeved on the air guide pipe (12). The outer circle of the resisting disc (9) is in contact with the inner wall of the separation cylinder (6). A corrugated air bag (10) is installed on the resisting disc (9). The other side of the corrugated air bag (10) is connected with the sealing disc (22). A return spring (11) is sleeved on the air guide pipe (12). One end of the return spring (11) is connected with the resisting disc (9), and the other end of the return spring (11) is connected with the sealing disc (22). A three-way air pipe (13) is arranged in the frame cover (14). One end of the three-way air pipe (13) is communicated with the corrugated air bag (10), one end of the three-way air pipe (13) is communicated with the air guide pipe (12), and one end of the three-way air pipe (13) is communicated with the inner cavity of the frame cover (14). An air vent is arranged on the frame cover (14), and a second filter net is arranged in the air vent.

5. The sand prevention device for a choke and kill manifold according to claim 4, characterized in that: There are two one-way valves provided on the three-way gas pipeline (13). One of the one-way valves is located at the port of the three-way gas pipeline (13) that communicates with the inner cavity of the frame cover (14), so that the air flow in the inner cavity of the frame cover (14) can only flow into the three-way gas pipeline (13). The other one-way valve is located at the port of the three-way gas pipeline (13) that communicates with the guide pipe (12), so that the air flow entering the three-way gas pipeline (13) can only flow into the guide pipe (12).

6. The sand control device for a throttle and kill manifold according to claim 5, characterized in that: A positioning ring (17) is provided in the branch pipe (15). A piston sheet (18) is provided on the positioning ring (17). The piston sheet (18) is used to block the inner ring of the positioning ring (17), thereby forming a blockage in the branch pipe (15). A reset assembly (20) is provided in the branch pipe (15) to make the piston sheet (18) closely connected to the positioning ring (17) when the piston sheet (18) is not under external force.

7. The sand prevention device for a throttle and kill manifold according to claim 6, characterized in that: A water guide opening (16) is formed in the branch pipe (15). The water guide opening (16) is inclined. During the rotation of the separation cylinder (6), the fluid in the sand prevention cylinder (1) will be driven to rotate, forming a vortex. Part of the fluid enters the branch pipe (15) through the water guide opening (16). And during this process, the fluid has an impact force. Under the action of this impact force, the fluid sprays out through the port of the branch pipe (15) and acts on the filter holes on the separation cylinder (6), completing the cleaning operation of the filter holes.

8. The sand control device for a throttle and kill manifold according to claim 7, characterized in that: A corrugated buffer sleeve (21) is provided on the inner ring of the sand prevention cylinder (1). The outer ring of the corrugated buffer sleeve (21) is cylindrical and is connected to the inner wall of the sand prevention cylinder (1). The inner ring is corrugated and has a plurality of through grooves. During the rotation of the fluid with the separation cylinder (6), a centrifugal force will be formed. Under the action of the centrifugal force, the impurities in the fluid will move outwards and then collide with the corrugated buffer sleeve (21). The corrugated buffer sleeve (21) buffers the collision force, reduces the damage to the sand prevention cylinder (1), and at the same time reduces the noise generated by the collision.

9. The sand control device for a throttle and kill manifold according to claim 8, characterized in that: After the impact force formed when the fluid enters the sand prevention cylinder (1) through the first guide pipe (3) acts on the fan plate (7), the fan plate (7) rotates accordingly to buffer the impact force, reduce the damage caused by the fluid impact force to the separation cylinder (6), and ensure the service life of the separation cylinder (6).

Images