An automatic choke manifold for managed pressure drilling

Abstract

The application discloses a kind of automatic throttle manifolds of pressure control drilling, it is related to marine oil drilling equipment technical field, support seat is installed for being connected with wellhead equipment liquid inlet pipeline, both sides of liquid inlet pipeline are connected with throttle pipeline by the broken filter assembly of inclination arrangement, the height of the end of broken filter assembly close to liquid inlet pipeline distance support seat is higher than the height of the end of broken filter assembly away from liquid inlet pipeline distance support seat;Liquid inlet pipeline is connected with the blow-off pipeline away from wellhead equipment, every side of blow-off pipeline is connected with a throttle pipeline, and both sides of blow-off pipeline away from throttle pipeline are connected with flow monitoring pipeline;Broken filter assembly is used to break and filter the liquid from downhole, and the recovery pipeline for collecting filtered foreign matter is connected to the broken filter assembly, the application can not only realize pressure regulation by throttle pipeline, but also can break and filter the downhole liquid returned, ensure the stability of throttle manifold operation.

Description

Technical Field

[0001] This invention relates to the field of offshore oil drilling equipment technology, and in particular to an automatic throttling manifold for pressure-controlled drilling. Background Technology

[0002] In the process of oil drilling, the choke manifold plays a crucial role in wellbore pressure control. The choke manifold can control the wellbore pressure, thereby protecting the wellhead equipment and drilling equipment. When the wellbore pressure is too high, the pressure can be reduced by adjusting the choke manifold to prevent damage to the wellhead equipment and drilling equipment.

[0003] While existing throttling manifolds can regulate pressure and release pressure when it is too high, they cannot filter the return fluid, which can easily lead to blockage of the throttling line and affect the subsequent pressure reduction function. Although some existing throttling manifolds have filtration mechanisms, most of them only use filter cylinders with filter screens to achieve filtration, resulting in poor filtration effect and low filtration efficiency. They also require frequent cleaning and maintenance and cannot break up large-sized rock cuttings and other foreign objects. It should be noted that this invention can be used in marine drilling. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes an automatic choke manifold for pressure-controlled drilling, applicable to offshore drilling. The manifold includes a support base and an external control system. The support base is equipped with an inlet pipe for connection to wellhead equipment. Both sides of the inlet pipe are connected to choke pipes via inclined break-and-filter assemblies. The distance from the end of the break-and-filter assembly closer to the inlet pipe to the support base is higher than the distance from the end of the break-and-filter assembly farther from the inlet pipe. A venting pipe is connected to the end of the inlet pipe farther from the wellhead equipment. Each side of the venting pipe is connected to a choke pipe, and flow monitoring pipes are connected to both sides of the venting pipe farther from the choke pipe. The break-and-filter assembly is used to break and filter the fluid returning from downhole. An external recovery pipe is connected to the break-and-filter assembly for collecting filtered foreign matter. The inlet pipe, break-and-filter assembly, choke pipe, venting pipe, and flow monitoring pipes are all controlled by the external control system.

[0005] Furthermore, the crushing and filtering assembly includes a support mechanism, a crushing mechanism, and a filtering mechanism. The support mechanism is mounted on a support base and is disposed on the side of the liquid inlet pipe. The crushing mechanism and the filtering mechanism are both inclinedly disposed on the support base through the support mechanism. The crushing mechanism is connected to the liquid inlet pipe, one end of the filtering mechanism is connected to the throttling pipe, and the other end of the filtering mechanism is connected to an external recovery pipe.

[0006] Furthermore, the crushing mechanism includes a feed cylinder, a feed pipe, a second support frame, a first motor, a second filter cylinder, and a crushing shaft. The feed cylinder is fixedly installed at one end of the support mechanism and is rotatably connected to the filter mechanism. The second support frame is fixedly installed at the other end of the support mechanism. The feed pipe is fixedly installed on the feed cylinder and is connected to the liquid inlet pipe through the feed pipe. The first motor is fixedly installed on the second support frame. The crushing shaft is coaxially rotatably installed inside the feed cylinder and is disposed inside the filter mechanism. The crushing shaft passes through the filter mechanism and the second support frame and is coaxially fixedly connected to the output shaft of the first motor. Multiple sets of crushing cones are evenly spaced on the crushing shaft, and each set of crushing cones has multiple cones evenly arranged in a circumferential shape.

[0007] Further, the filtration mechanism includes a discharge pipe 1, a discharge pipe 2, a belt drive assembly, a motor 2, a filter cylinder 1, a filter cylinder 2, and a support ring. The discharge pipe 1 is fixedly installed at the end of the support mechanism near the feed cylinder, and the discharge pipe 2 is fixedly installed at the end of the support mechanism away from the feed cylinder. The support mechanism is connected to a throttling pipeline through the discharge pipe 2. The filter cylinder 1 is fixedly installed inside the support mechanism, and the filter cylinder 2 is rotatably installed inside the support mechanism. The support ring is coaxially fixedly installed inside the filter cylinder 1 near the feed cylinder. The filter cylinder 2 is rotatably installed inside the filter cylinder 1 through the support ring. The motor 2 is fixedly installed above the support cylinder. The end of the filter cylinder 2 near the support frame 2 is connected to the output shaft of the motor 2 through the belt drive assembly. The output shaft of the motor 2 drives the filter cylinder 2 to rotate through the belt drive assembly. A spiral conveying blade is fixedly installed on the filter cylinder two. The filter cylinder two is connected to the recycling pipeline through the discharge pipe one. The end of the filter cylinder two near the support frame two has multiple discharge ports evenly opened in a circular shape for discharging filtered foreign objects. The filter cylinder two drives the rotation of the spiral conveying blade to transport the filtered foreign objects to the discharge pipe one, and then discharge them into the recycling pipeline for recycling. The side of the filter cylinder two near the discharge port has multiple filter holes one evenly opened. The side of the filter cylinder two near the support ring is set as a closed section. The filter cylinder one has multiple filter holes two evenly opened. The crushing shaft is coaxially rotatably installed in the filter cylinder two. The filter cylinder two is coaxially rotatably connected to the feed cylinder. The crushing shaft passes through the support frame two and the belt drive assembly. The height of one end of the feed pipe from the support base is higher than the height of one end of the filter cylinder two from the support base.

[0008] Furthermore, the liquid inlet pipeline includes a five-way connector, a connecting pipe, a flat valve, a pressure gauge, a flat valve, and a four-way connector. The five-way connector is fixedly installed on the support base. The flat valve is connected to the five-way connector via the connecting pipe. A pressure gauge is installed on the flat valve. Both sides of the five-way connector are connected to the four-way connector via the flat valve. The four-way connector is connected to the feed pipe.

[0009] Furthermore, the throttling pipeline includes a throttling valve, a support frame three, a connecting pipe two, a connecting pipe three, and a connecting pipe four. The throttling valve is fixedly installed on the support base and is connected to the discharge pipe two. The throttling valve is connected to a four-way connector two through the connecting pipe two. The four-way connector two is connected to a flat valve three through the connecting pipe three. The flat valve three is connected to the discharge pipeline through the connecting pipe four. The support frame three and the four-way connector two are both fixedly installed on the support base. Multiple support frames three are provided. The throttling valve and the connecting pipe two are connected through one support frame three. The connecting pipe three and the flat valve three are connected through one support frame three. The flat valve three and the connecting pipe four are connected through one support frame three.

[0010] Furthermore, the discharge pipeline includes a four-way connector three, a flat valve four, a connecting pipe five, a support frame four, a connecting pipe six, a four-way connector four, and a flat valve five. The four-way connector three, the support frame four, the four-way connector four, and the four-way connector five are all fixedly installed on the support base. The connecting pipe five is connected to the five-way connector. The connecting pipe five is connected to the four-way connector three through the flat valve four. The flat valve four and the connecting pipe five are connected through the support frame four. The four-way connector three is connected to the four-way connector four through the connecting pipe six. The four-way connector four is connected to the four-way connector five through the flat valve five. The four-way connector four and the four-way connector five are both connected to the flow monitoring pipeline. The connecting pipe four is connected to the four-way connector three.

[0011] Furthermore, the flow monitoring pipeline includes a flow meter, a support frame five, a flat valve six, a four-way connector six, a connecting pipe seven, a four-way connector seven, a connecting pipe eight, and a flat valve seven. The support frame five, four-way connector six, and four-way connector seven are all fixedly installed on the support base. Multiple support frames five are provided. The flat valve six is ​​connected to the four-way connector four. The flat valve six is ​​connected to the flow meter through a support frame five. The flow meter is connected to the four-way connector six. The four-way connector six is ​​connected to the four-way connector seven through the connecting pipe seven. The four-way connector seven is connected to the flat valve seven through the connecting pipe eight. The connecting pipe eight and the flat valve seven are connected through a support frame five. The flat valve seven is connected to the four-way connector five.

[0012] Furthermore, the support mechanism includes a support cylinder and a support frame one. The support frame one is fixedly installed on a support base. The support cylinder is inclinedly installed on the support base via the support frame one. The feed cylinder and the support frame two are respectively fixedly installed at both ends of the support cylinder. The discharge pipe one is fixedly installed below the end of the support cylinder near the feed cylinder. The discharge pipe two is fixedly installed below the end of the support cylinder away from the feed cylinder. The support cylinder is connected to a throttling pipe via the discharge pipe two. The filter cylinder is coaxially fixedly installed inside the support cylinder. The filter cylinder two is coaxially rotatably installed inside the support cylinder.

[0013] Furthermore, the belt drive assembly includes a first pulley, a belt, and a second pulley. The first pulley is coaxially and fixedly installed at the end of the filter cylinder two away from the feed cylinder. The crushing shaft passes through the first pulley. The second pulley is coaxially and fixedly installed on the output shaft of the second motor. The first pulley and the second pulley are connected by a belt.

[0014] The beneficial effects of this invention compared with the prior art are: (1) This invention can fully crush and filter the mud and rock cuttings in the well through the crushing and filtering assembly. The crushed small-sized mud and rock cuttings enter the support cylinder through the filter hole, filter cylinder one, and filter hole two with the liquid, and then enter the throttling pipeline from filter cylinder two. The large-sized mud and rock cuttings that are not completely crushed are thrown out of the discharge port to the outside of filter cylinder two under the action of centrifugal force. Through the rotation of the spiral conveying blades on filter cylinder two, the large-sized mud and rock cuttings can be discharged into the recovery pipeline for recycling, thereby greatly improving the treatment of downhole liquids, mud and rock cuttings. The crushing and filtering effect can avoid clogging the subsequent throttling pipeline, ensuring the stability of the throttling manifold operation. It also solves the technical problem that the existing technology can only crush or filter separately, improving work efficiency and effect while saving space and cost. (2) By setting two sets of throttling pipelines and flow monitoring pipelines, the present invention can stably achieve pressure reduction and monitoring, and can realize one set in operation and one set in standby, thereby preventing the problem of pressure reduction monitoring being affected by the failure of one set. (3) The present invention can achieve pressure reduction by releasing the venting manifold when the pressure is too high and the throttling pressure reduction cannot meet the requirements, thus improving safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the throttling manifold structure of the present invention.

[0016] Figure 2 This is a front view of the throttling manifold of the present invention.

[0017] Figure 3 This is a top view of the throttling manifold of the present invention.

[0018] Figure 4 This is a side view of the throttling manifold of the present invention.

[0019] Figure 5 This is a schematic diagram of the crushing and filtering component structure of the present invention.

[0020] Figure 6 This is a schematic diagram of a partial structure of the crushing and filtering component of the present invention. Figure 1 .

[0021] Figure 7 This is a schematic diagram of a partial structure of the crushing and filtering component of the present invention. Figure 2 .

[0022] Figure 8 This is a top view of the crushing and filtering assembly of the present invention.

[0023] Figure 9 For the present invention Figure 8 A cross-sectional view along the AA direction.

[0024] Figure 10 This is a partial structural diagram of the liquid inlet pipeline of the present invention.

[0025] Figure 11 This is a schematic diagram of the throttling pipeline structure of the present invention.

[0026] Figure 12 This is a schematic diagram of the discharge pipeline and flow monitoring pipeline of the present invention.

[0027] Reference numerals: 101-Support base; 201-Five-way connector; 202-Connecting pipe one; 203-Flat valve one; 204-Pressure gauge; 205-Flat valve two; 206-Four-way connector one; 301-Support cylinder; 302-Support frame one; 303-Feed cylinder; 304-Feed pipe; 305-Discharge pipe one; 306-Discharge pipe two; 307-Support frame two; 308-Motor one; 309-Belt drive assembly; 310-Motor two; 311-Filter cylinder one; 312-Filter cylinder two; 313-Screw conveyor blade; 314-Discharge port; 315-Support ring; 316-Crushing cone; 317-Crushing... Shaft; 401-Throttle valve; 402-Support frame three; 403-Connecting pipe two; 404-Four-way connector two; 405-Connecting pipe three; 406-Flat valve three; 407-Connecting pipe four; 501-Four-way connector three; 502-Flat valve four; 503-Connecting pipe five; 504-Support frame four; 505-Connecting pipe six; 506-Four-way connector four; 507-Flat valve five; 508-Four-way connector five; 601-Flow meter; 602-Support frame five; 603-Flat valve six; 604-Four-way connector six; 605-Connecting pipe seven; 606-Four-way connector seven; 607-Connecting pipe eight; 608-Flat valve seven. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0029] Example: Figures 1-12 The automatic choke manifold for controlled pressure drilling shown includes a support base 101 and an external control system. The support base 101 is equipped with an inlet pipe for connection to wellhead equipment. Both sides of the inlet pipe are connected to choke pipes through inclined crushing and filtering components. The height of the end of the crushing and filtering component closer to the inlet pipe from the support base 101 is higher than the height of the end of the crushing and filtering component farther from the inlet pipe from the support base 101. The inlet pipeline is connected to a venting pipeline at the end furthest from the wellhead equipment. Each side of the venting pipeline is connected to a choke pipeline, and flow monitoring pipelines are connected to both sides of the venting pipeline furthest from the choke pipelines. The break-and-filter assembly is used to break and filter the fluid returning from downhole. The break-and-filter assembly is externally connected to a recovery pipeline for collecting filtered foreign matter. The inlet pipeline, break-and-filter assembly, choke pipeline, venting pipeline, and flow monitoring pipeline are all controlled by an external control system.

[0030] The crushing and filtering assembly includes a support mechanism, a crushing mechanism, and a filtering mechanism. The support mechanism is mounted on a support base 101 and is located on the side of the liquid inlet pipe. The crushing mechanism and the filtering mechanism are both inclinedly mounted on the support base 101 through the support mechanism. The crushing mechanism is connected to the liquid inlet pipe, one end of the filtering mechanism is connected to the throttling pipe, and the other end of the filtering mechanism is connected to an external recovery pipe.

[0031] The crushing mechanism includes a feed cylinder 303, a feed pipe 304, a second support frame 307, a first motor 308, a second filter cylinder 312, and a crushing shaft 317. The feed cylinder 303 is fixedly installed at one end of the support mechanism and is rotatably connected to the filter mechanism. The second support frame 307 is fixedly installed at the other end of the support mechanism. The feed pipe 304 is fixedly installed on the feed cylinder 303 and is connected to the liquid inlet pipe through the feed pipe 304. The first motor 308 is fixedly installed on the second support frame 307. The crushing shaft 317 is coaxially rotatably installed inside the feed cylinder 303 and is located inside the filter mechanism. The crushing shaft 317 passes through the filter mechanism and the second support frame 307 and is coaxially fixedly connected to the output shaft of the first motor 308. Multiple sets of crushing cones 316 are evenly spaced on the crushing shaft 317, and each set of crushing cones 316 has multiple cones evenly arranged in a circumferential shape.

[0032] The filtration mechanism includes a first discharge pipe 305, a second discharge pipe 306, a belt drive assembly 309, a second motor 310, a first filter cartridge 311, a second filter cartridge 312, and a support ring 315. The first discharge pipe 305 is fixedly installed at the end of the support mechanism near the feed cylinder 303, and the second discharge pipe 306 is fixedly installed at the end of the support mechanism away from the feed cylinder 303. The support mechanism is connected to a throttling pipeline through the second discharge pipe 306. The first filter cartridge 311 is fixedly installed inside the support mechanism, and the second filter cartridge 312 is rotatably installed on... Inside the support mechanism, a support ring 315 is coaxially fixedly installed inside filter cylinder one 311 at one end near the feed cylinder 303. Filter cylinder two 312 is rotatably installed inside filter cylinder one 311 via the support ring 315. Motor two 310 is fixedly installed above the support cylinder 301. The end of filter cylinder two 312 near the support frame two 307 is connected to the output shaft of motor two 310 via belt drive assembly 309. The output shaft of motor two 310 drives filter cylinder two 312 to rotate via belt drive assembly 309. A spiral conveying blade 313 is fixedly installed on filter cylinder 312. Filter cylinder 312 is connected to the recovery pipeline through discharge pipe 305. Multiple discharge ports 314, evenly spaced in a circular shape, are evenly distributed on one end of filter cylinder 312 near support frame 307 to discharge filtered foreign matter. The rotation of the spiral conveying blade 313 driven by filter cylinder 312 transports the filtered foreign matter to discharge pipe 305, from where it is discharged into the recovery pipeline for recycling. The side of filter cylinder 312 near the discharge ports 314... Multiple filter holes are evenly provided. The side of the filter cylinder 312 near the support ring 315 is set as a closed section. Multiple filter holes are evenly provided on the filter cylinder 311. The crushing shaft 317 is coaxially rotatably installed in the filter cylinder 312. The filter cylinder 312 is coaxially rotatably connected to the feed cylinder 303. The crushing shaft 317 passes through the support frame 307 and the belt drive assembly 309. The height of one end of the feed pipe 304 from the support base 101 is higher than the height of one end of the filter cylinder 312 from the support base 101.

[0033] The liquid inlet pipeline includes a five-way connector 201, a connecting pipe 1 202, a flat valve 1 203, a pressure gauge 204, a flat valve 2 205, and a four-way connector 1 206. The five-way connector 201 is fixedly installed on the support base 101. The flat valve 1 203 is connected to the five-way connector 201 through the connecting pipe 1 202. The pressure gauge 204 is installed on the flat valve 1 203. The four-way connector 1 206 is connected to both sides of the five-way connector 201 through the flat valve 2 205. The four-way connector 1 206 is connected to the feed pipe 304.

[0034] The throttling pipeline includes a throttling valve 401, a support frame 402, a connecting pipe 403, a connecting pipe 405, and a connecting pipe 407. The throttling valve 401 is fixedly installed on the support base 101 and is connected to the discharge pipe 306. The throttling valve 401 is connected to a four-way connector 404 via the connecting pipe 403. The four-way connector 404 is connected to a flat valve 406 via the connecting pipe 405. The flat valve 406 is connected to the discharge pipeline via the connecting pipe 407. The support frame 402 and the four-way connector 404 are both fixedly installed on the support base 101. Multiple support frames 402 are provided. The throttling valve 401 and the connecting pipe 403 are connected by one support frame 402. The connecting pipe 405 and the flat valve 406 are connected by one support frame 402. The flat valve 406 and the connecting pipe 407 are connected by one support frame 402.

[0035] The discharge pipeline includes a four-way connector 3501, a flat valve 4502, a connecting pipe 503, a support frame 4504, a connecting pipe 6505, a four-way connector 4506, and a flat valve 507. Four-way connector 3501, support frame 4504, four-way connector 4506, and four-way connector 508 are all fixedly installed on the support base 101. Connecting pipe 503 is connected to the five-way connector 201. Connecting pipe 503 is connected to four-way connector 3501 via flat valve 4502. Flat valve 4502 and connecting pipe 503 are connected via support frame 4504. Four-way connector 3501 is connected to four-way connector 4506 via connecting pipe 6505. Four-way connector 4506 is connected to four-way connector 508 via flat valve 507. Four-way connectors 4506 and 4-way connector 508 are both connected to the flow monitoring pipeline. Connecting pipe 407 is connected to four-way connector 3501.

[0036] The flow monitoring pipeline includes a flow meter 601, a support frame 602, a flat valve 603, a four-way connector 604, a connecting pipe 605, a four-way connector 606, a connecting pipe 607, and a flat valve 608. The support frame 602, four-way connector 604, and four-way connector 606 are all fixedly installed on the support base 101. Multiple support frames 602 are provided. The flat valve 603 is connected to the four-way connector 4 506. The flat valve 603 is connected to the flow meter 601 through a support frame 602. The flow meter 601 is connected to the four-way connector 604. The four-way connector 604 is connected to the four-way connector 7 606 through a connecting pipe 7 605. The four-way connector 7 606 is connected to the flat valve 7 608 through a connecting pipe 8 607. The connecting pipe 8 607 and the flat valve 7 608 are connected through a support frame 602. The flat valve 7 608 is connected to the four-way connector 5 508.

[0037] The support mechanism includes a support cylinder 301 and a support frame 302. The support frame 302 is fixedly installed on the support base 101. The support cylinder 301 is inclinedly installed on the support base 101 through the support frame 302. The feed cylinder 303 and the support frame 307 are respectively fixedly installed at both ends of the support cylinder 301. The discharge pipe 305 is fixedly installed below the end of the support cylinder 301 near the feed cylinder 303. The discharge pipe 306 is fixedly installed below the end of the support cylinder 301 away from the feed cylinder 303. The support cylinder 301 is connected to the throttling pipeline through the discharge pipe 306. The filter cylinder 311 is coaxially fixedly installed inside the support cylinder 301. The filter cylinder 312 is coaxially rotatably installed inside the support cylinder 301.

[0038] The belt drive assembly 309 includes a pulley 1, a belt and a pulley 2. The pulley 1 is coaxially and fixedly installed on the end of the filter cylinder 2 312 away from the feed cylinder 303. The crushing shaft 317 passes through the pulley 1. The pulley 2 is coaxially and fixedly installed on the output shaft of the motor 2 310. The pulley 1 and the pulley 2 are connected by a belt.

[0039] The working principle of this invention is as follows: When the crushing and filtering assembly is working: Downhole fluid (mud, rock cuttings, etc.) enters the feed cylinder 303 through the feed pipe 304, and then enters the filter cylinder 312. The output shaft of motor 308 drives the crushing shaft 317 to rotate. The rotation of the crushing shaft 317 drives multiple crushing cones 316 to rotate. Simultaneously, the output shafts of the crushing cones 316 drive the pulleys on the belt drive assembly 309 to rotate. The pulleys drive the pulleys, which in turn drive the filter cylinder 312 to rotate via a belt. It should be noted that the filter cylinder 312 and the crushing shaft... The opposite rotation direction of 317 ensures that the mud and rock fragments inside the filter cylinder 312 can fully contact the crushing cone 316, thereby improving the crushing effect on the mud and rock fragments inside the filter cylinder 312. Because the crushing and filtering assembly is inclined (the height of one end of the feed pipe 304 from the support base 101 is higher than the height of one end of the filter cylinder 312 from the support base 101), and the side of the filter cylinder 312 near the support ring 315 is a closed section, the liquid entering the filter cylinder 312 will not fall directly into the discharge pipe 305 below, preventing liquid from flowing out... The problem of direct discharge from the discharge pipe 305 is addressed by multiple rotating crushing cones 316, which crush large-sized mud and rock fragments in the liquid. The crushed smaller mud and rock fragments enter the filter cylinder 311 through filter hole 1, then through filter hole 2 on filter cylinder 311 into the support cylinder 301, and finally through the discharge pipe 306 into the throttling pipeline. Meanwhile, the large-sized mud and rock fragments that are not completely crushed are thrown out of the discharge port 314 by centrifugal force to the outside of filter cylinder 312, where they are conveyed by the spiral conveyor blades 313. The rotating conveyor allows large-sized mud and rock cuttings to move towards the discharge pipe 305 along with the spiral conveyor blades 313. When they reach the discharge pipe 305, they are discharged from the discharge pipe 305 into the recovery pipeline for recycling. This greatly improves the crushing and filtering effect on downhole liquids, mud, and rock cuttings, avoids clogging of subsequent throttling pipelines, ensures the stability of the throttling manifold operation, and solves the technical problem that existing technologies can only perform crushing or filtering separately. This improves work efficiency and effectiveness while saving space and cost.

[0040] When pressure reduction is required on one side of the throttling pipeline, open the corresponding flat valve 205 on the inlet pipeline and the corresponding flat valve 406 in the throttling pipeline, while simultaneously closing the other side's flat valves 205 and 406, and closing flat valve 402. If flow monitoring of the throttling pipeline is not required, close both flat valves 603 and 608, and open flat valve 507. The downhole fluid flows through the five-way connector. The feed tube 201 passes through flat valve 205 and four-way connector 206 into the crushing and filtering assembly for crushing and filtration. It then passes through throttle valve 401 for pressure reduction, and then through connecting pipe 203, four-way connector 204, connecting pipe 305, flat valve 306, and connecting pipe 407 into four-way connector 301. Finally, it is discharged externally through four-way connector 301, connecting pipe 605, four-way connector 406, flat valve 507, and four-way connector 508. In the recovery pool; if it is necessary to use the flow monitoring pipeline to monitor the flow of the throttling pipeline, close the flat valve 507, and open one side of the flat valve 603 and flat valve 7 608. The downhole fluid enters the crushing and filtering assembly through the five-way connector 201, flat valve 205, and four-way connector 1 206 for crushing and filtering, then passes through the throttling valve 401 for pressure reduction, and then through connecting pipe 2 403, four-way connector 2 404, connecting pipe 3 405, and flat valve 3 406. 06. Connecting pipe 407 enters four-way connector 3501, and then passes through four-way connector 3501, connecting pipe 6505, four-way connector 4506, and flat valve 603 before entering flow meter 601 for flow monitoring. Then, it is discharged into the external recovery tank through four-way connector 604, four-way connector 7606, connecting pipe 8607, flat valve 7608, and four-way connector 5508, thus facilitating the monitoring of the flow in the throttling pipeline through the flow monitoring pipeline.

[0041] When the pressure is too high and the throttling pipeline cannot meet the pressure reduction requirements, open the flat plate valve 4 502 and the flat plate valve 5 507, and close the two flat plate valves 2 205, 6 603 and 7 608. Use the venting pipeline to release and reduce pressure. During the venting and pressure reduction, the downhole fluid is discharged into the recovery pool through the connecting pipe 5 503, the flat plate valve 4 502, the four-way connector 3 501, the connecting pipe 6 505, the four-way connector 4 506, the flat plate valve 5 507 and the four-way connector 5 508.

[0042] It should be noted that when reducing pressure, only one of the two throttling lines is used, with the other as a backup. If one of the throttling lines fails, the other is used to reduce pressure, thus avoiding the inability to achieve the required pressure reduction due to a throttling line failure. In addition, both flow monitoring lines can monitor the flow of both throttling lines. Only one flow monitoring line is used to monitor the flow of one throttling line at a time, thereby ensuring the stability of flow monitoring.

Claims

1. A pressure-controlled drilling automatic choke manifold, comprising a support base (101) and an external control system, characterized in that, The support base (101) is equipped with an inlet pipe for connecting to the wellhead equipment. Both sides of the inlet pipe are connected to throttling pipes through inclined crushing and filtering components. The height of the end of the crushing and filtering component near the inlet pipe from the support base (101) is higher than the height of the end of the crushing and filtering component away from the inlet pipe from the support base (101). The inlet pipeline is connected to a venting pipeline at the end furthest from the wellhead equipment. Each side of the venting pipeline is connected to a throttling pipeline, and flow monitoring pipelines are connected to both sides of the venting pipeline furthest from the throttling pipelines. The crushing and filtering assembly is used to crush and filter the fluid returning from downhole. The crushing and filtering assembly is externally connected to a recovery pipeline for collecting filtered foreign matter. The inlet pipeline, crushing and filtering assembly, throttling pipeline, venting pipeline, and flow monitoring pipeline are all controlled by an external control system.

2. The automatic choke manifold for controlled pressure drilling as described in claim 1, characterized in that, The crushing and filtering assembly includes a support mechanism, a crushing mechanism, and a filtering mechanism. The support mechanism is mounted on a support base (101) and is located on the side of the liquid inlet pipe. The crushing mechanism and the filtering mechanism are both inclinedly mounted on the support base (101) through the support mechanism. The crushing mechanism is connected to the liquid inlet pipe, one end of the filtering mechanism is connected to the throttling pipe, and the other end of the filtering mechanism is connected to an external recovery pipe.

3. The automatic choke manifold for pressure-controlled drilling as described in claim 2, characterized in that, The crushing mechanism includes a feed cylinder (303), a feed pipe (304), a second support frame (307), a first motor (308), a second filter cylinder (312), and a crushing shaft (317). The feed cylinder (303) is fixedly installed at one end of the support mechanism and is rotatably connected to the filter mechanism. The second support frame (307) is fixedly installed at the other end of the support mechanism. The feed pipe (304) is fixedly installed on the feed cylinder (303), and the feed cylinder (303) is connected to the filter mechanism via the feed pipe (304). The liquid inlet pipe is connected, the motor (308) is fixedly installed on the support frame (307), the crushing shaft (317) is coaxially rotatably installed in the feed cylinder (303), the crushing shaft (317) is set in the filter mechanism, the crushing shaft (317) passes through the filter mechanism and the support frame (307) and is coaxially fixedly connected to the output shaft of the motor (308), and multiple sets of crushing cones (316) are evenly spaced on the crushing shaft (317), and each set of crushing cones (316) is evenly arranged in a circumferential shape.

4. The automatic choke manifold for pressure-controlled drilling as described in claim 3, characterized in that, The filtration mechanism includes a discharge pipe 1 (305), a discharge pipe 2 (306), a belt drive assembly (309), a motor 2 (310), a filter cylinder 1 (311), a filter cylinder 2 (312), and a support ring (315). The discharge pipe 1 (305) is fixedly installed at one end of the support mechanism near the feed cylinder (303), and the discharge pipe 2 (306) is fixedly installed at the other end of the support mechanism away from the feed cylinder (303). The support mechanism is connected to a throttling pipeline through the discharge pipe 2 (306). The filter cylinder 1 (311) is fixedly installed inside the support mechanism, and the filter cylinder 2 (312) is rotatably installed. Within the support mechanism, the support ring (315) is coaxially fixedly installed inside the first filter cylinder (311) at one end near the feed cylinder (303). The second filter cylinder (312) is rotatably installed inside the first filter cylinder (311) via the support ring (315). The second motor (310) is fixedly installed above the support cylinder (301). The end of the second filter cylinder (312) near the second support frame (307) is connected to the output shaft of the second motor (310) via a belt drive assembly (309). The output shaft of the second motor (310) drives the second filter cylinder (312) to rotate via the belt drive assembly (309). The filter cylinder two (312) is fixedly equipped with spiral conveying blades (313). The filter cylinder two (312) is connected to the recycling pipeline through the discharge pipe one (305). The end of the filter cylinder two (312) near the support frame two (307) is evenly provided with multiple discharge ports (314) for discharging filtered foreign objects in a circular shape. The filter cylinder two (312) drives the spiral conveying blades (313) to rotate and transport the filtered foreign objects to the discharge pipe one (305). The foreign objects are discharged through the discharge pipe one (305) into the recycling pipeline for recycling. The side of the filter cylinder two (312) near the discharge port (314) is evenly provided with multiple discharge ports (314). Multiple filter holes are evenly provided. The side of the filter cylinder (312) near the support ring (315) is set as a closed section. Multiple filter holes are evenly provided on the filter cylinder (311). The crushing shaft (317) is coaxially and rotatably installed in the filter cylinder (312). The filter cylinder (312) is coaxially and rotatably connected to the feed cylinder (303). The crushing shaft (317) passes through the support frame (307) and the belt drive assembly (309). The height of one end of the feed pipe (304) from the support seat (101) is higher than the height of one end of the filter cylinder (312) from the support seat (101).

5. The automatic choke manifold for pressure-controlled drilling as described in claim 4, characterized in that, The liquid inlet pipeline includes a five-way connector (201), a connecting pipe (202), a flat valve (203), a pressure gauge (204), a flat valve (205), and a four-way connector (206). The five-way connector (201) is fixedly installed on the support base (101). The five-way connector (201) is connected to the flat valve (203) through the connecting pipe (202). The flat valve (203) is equipped with a pressure gauge (204). Both sides of the five-way connector (201) are connected to the four-way connector (206) through the flat valve (205). The four-way connector (206) is connected to the feed pipe (304).

6. The automatic choke manifold for controlled pressure drilling as described in claim 5, characterized in that, The throttling pipeline includes a throttling valve (401), a support frame three (402), a connecting pipe two (403), a connecting pipe three (405), and a connecting pipe four (407). The throttling valve (401) is fixedly installed on the support base (101). The throttling valve (401) is connected to the discharge pipe two (306). The throttling valve (401) is connected to a four-way connector two (404) through the connecting pipe two (403). The four-way connector two (404) is connected to a flat valve three (406) through the connecting pipe three (405). The flat valve three (406) is open to... The four connecting pipes (407) are connected to the discharge pipe. The three support frames (402) and the four-way connector (404) are both fixedly installed on the support base (101). There are multiple three support frames (402). The throttle valve (401) and the two connecting pipes (403) are connected through one three support frame (402). The three connecting pipes (405) and the three flat valves (406) are connected through one three support frame (402). The three flat valves (406) and the four connecting pipes (407) are connected through one three support frame (402).

7. The automatic choke manifold for pressure-controlled drilling as described in claim 6, characterized in that, The discharge pipeline includes a four-way connector three (501), a flat valve four (502), a connecting pipe five (503), a support frame four (504), a connecting pipe six (505), a four-way connector four (506), and a flat valve five (507). The four-way connector three (501), support frame four (504), four-way connector four (506), and four-way connector five (508) are all fixedly installed on the support base (101). The connecting pipe five (503) is connected to the five-way connector (201). The connecting pipe five (503) is connected to the flat valve four (502) through the flat valve four (502). The four-way connector is connected to the four-way connector three (501). The four-way valve four (502) and the connecting pipe five (503) are connected by the support frame four (504). The four-way connector three (501) is connected to the four-way connector four (506) through the connecting pipe six (505). The four-way connector four (506) is connected to the four-way connector five (508) through the four-way valve five (507). The four-way connector four (506) and the four-way connector five (508) are both connected to the flow monitoring pipeline. The connecting pipe four (407) is connected to the four-way connector three (501).

8. The automatic choke manifold for pressure-controlled drilling as described in claim 7, characterized in that, The flow monitoring pipeline includes a flow meter (601), a support frame five (602), a flat valve six (603), a four-way connector six (604), a connecting pipe seven (605), a four-way connector seven (606), a connecting pipe eight (607), and a flat valve seven (608). The support frame five (602), the four-way connector six (604), and the four-way connector seven (606) are all fixedly installed on the support base (101). Multiple support frames five (602) are provided. The flat valve six (603) is connected to the four-way connector four (606). 603) is connected to the flow meter (601) via a support frame five (602), the flow meter (601) is connected to the four-way connector six (604), the four-way connector six (604) is connected to the four-way connector seven (606) via a connecting pipe seven (605), the four-way connector seven (606) is connected to the flat valve seven (608) via a connecting pipe eight (607), the connecting pipe eight (607) and the flat valve seven (608) are connected via a support frame five (602), and the flat valve seven (608) is connected to the four-way connector five (508).

9. The automatic choke manifold for controlled pressure drilling as described in claim 8, characterized in that, The support mechanism includes a support cylinder (301) and a support frame one (302). The support frame one (302) is fixedly installed on the support base (101). The support cylinder (301) is inclinedly installed on the support base (101) through the support frame one (302). The feed cylinder (303) and the support frame two (307) are respectively fixedly installed at both ends of the support cylinder (301). The discharge pipe one (305) is fixedly installed below the end of the support cylinder (301) near the feed cylinder (303). The discharge pipe two (306) is fixedly installed below the end of the support cylinder (301) away from the feed cylinder (303). The support cylinder (301) is connected to the throttling pipeline through the discharge pipe two (306). The filter cylinder one (311) is coaxially fixedly installed inside the support cylinder (301). The filter cylinder two (312) is coaxially rotatably installed inside the support cylinder (301).

10. The automatic choke manifold for pressure-controlled drilling as described in claim 9, characterized in that, The belt drive assembly (309) includes a pulley one, a belt and a pulley two. The pulley one is coaxially fixedly installed at the end of the filter cylinder two (312) away from the feed cylinder (303). The crushing shaft (317) passes through the pulley one. The pulley two is coaxially fixedly installed on the output shaft of the motor two (310). The pulley one and the pulley two are connected by a belt.

Images