Automatic throttle manifold for pressure-controlled drilling

Abstract

The invention discloses an automatic throttle manifold for pressure-controlled drilling, and relates to the technical field of offshore oil drilling equipment, a liquid inlet pipeline used for being connected with wellhead equipment is mounted on a supporting seat, and throttle pipelines are connected to the two sides of the liquid inlet pipeline through crushing and filtering assemblies which are obliquely arranged; the distance between one end, close to the liquid inlet pipeline, of the crushing and filtering assembly and the supporting seat is larger than that between one end, away from the liquid inlet pipeline, of the crushing and filtering assembly and the supporting seat; one end, far away from the wellhead equipment, of the liquid inlet pipeline is connected with a blow-off pipeline, each side of the blow-off pipeline is connected with a throttling pipeline, and two sides, far away from the throttling pipelines, of the blow-off pipeline are connected with flow monitoring pipelines; the breaking and filtering assembly is used for breaking and filtering liquid returned from the underground, the breaking and filtering assembly is externally connected with a recycling pipeline used for collecting and filtering foreign matter, pressure adjustment can be achieved through the throttling pipeline, meanwhile, the returned underground liquid can be broken and filtered, and the running stability of the throttling manifold is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore oil drilling equipment, and particularly relates to an automatic throttle manifold for pressure control drilling. BACKGROUND

[0002] In the process of oil drilling, the throttle manifold plays a very key role in wellbore pressure control, and can control the wellbore pressure to protect the wellhead device and drilling equipment. When the wellbore pressure is too high, the pressure is reduced through the adjustment of the throttle manifold to prevent the wellhead device and drilling equipment from being damaged.

[0003] Although the throttle manifold in the prior art can realize the functions of adjusting the pressure and reducing the pressure by blowout when the pressure is too high, the throttle manifold in the prior art cannot filter the return liquid, which easily causes the throttle pipeline to be blocked and affects the subsequent pressure reduction function. Although some throttle manifolds in the prior art have a filtering mechanism, most of them only use a filter cartridge with a filter screen to realize filtering, and the filtering effect is poor, the filtering efficiency is low, and cleaning and maintenance need to be frequently performed. In addition, the filtering mechanism cannot crush large-size debris and other foreign matters, and needs to be noticed that the present application can be used in offshore drilling. SUMMARY

[0004] In view of the above technical problems, the present application provides an automatic throttle manifold for pressure control drilling, which can be used in offshore drilling and comprises a supporting seat and an external control system. A liquid inlet pipeline for connecting with a wellhead device is installed on the supporting seat. Throttle pipelines are connected to the liquid inlet pipeline through obliquely arranged crushing and filtering assemblies on both sides of the liquid inlet pipeline. The height of the end of the crushing and filtering assembly close to the liquid inlet pipeline from the supporting seat is higher than the height of the end of the crushing and filtering assembly away from the liquid inlet pipeline from the supporting seat. A blowout pipeline is connected to the end of the liquid inlet pipeline away from the wellhead device. Each side of the blowout pipeline is connected with a throttle pipeline. Flow monitoring pipelines are connected to both sides of the blowout pipeline away from the throttle pipelines. The crushing and filtering assemblies are used for crushing and filtering the liquid returned from the well. The crushing and filtering assemblies are externally connected with recovery pipelines for collecting filtered foreign matters. The liquid inlet pipeline, the crushing and filtering assemblies, the throttle pipelines, the blowout pipeline and the flow monitoring pipelines are controlled by the external control system.

[0005] Further, the crushing and filtering assemblies comprise supporting mechanisms, crushing mechanisms and filtering mechanisms. The supporting mechanisms are installed on the supporting seat and arranged on the side of the liquid inlet pipeline. The crushing mechanisms and the filtering mechanisms are obliquely arranged on the supporting seat through the supporting mechanisms. The crushing mechanisms are connected with the liquid inlet pipeline. One end of the filtering mechanisms is connected with the throttle pipelines. The other end of the filtering mechanisms is connected with the external recovery pipelines.

[0006] Further, the crushing mechanism comprises a feeding cylinder, a feeding pipe, a support frame two, a motor one, a filtering cylinder two and a crushing shaft, the feeding cylinder is fixedly installed at one end of the support mechanism, the feeding cylinder is rotationally connected with the filtering mechanism, the support frame two is fixedly installed at the other end of the support mechanism, the feeding pipe is fixedly installed on the feeding cylinder, the feeding cylinder is connected with the liquid inlet pipeline through the feeding pipe, the motor one is fixedly installed on the support frame two, the crushing shaft is coaxially rotationally installed in the feeding cylinder, the crushing shaft is arranged in the filtering mechanism, the crushing shaft is coaxially fixedly connected with the output shaft of the motor one and penetrates through the filtering mechanism and the support frame two, a plurality of groups of crushing cones are uniformly and spacedly arranged on the crushing shaft, and each group of crushing cones is circumferentially and uniformly provided with a plurality of crushing cones.

[0007] Further, the filtering mechanism comprises a discharging pipe one, a discharging pipe two, a belt transmission assembly, a motor two, a filtering cylinder one, a filtering cylinder two and a support ring, the discharging pipe one is fixedly installed at one end of the support mechanism close to the feeding cylinder, the discharging pipe two is fixedly installed at the other end of the support mechanism away from the feeding cylinder, the support mechanism is connected with the throttle pipeline through the discharging pipe two, the filtering cylinder one is fixedly installed in the support mechanism, the filtering cylinder two is rotationally installed in the support mechanism, the support ring is coaxially fixedly installed at one end of the filtering cylinder one close to the feeding cylinder, the filtering cylinder two is rotationally installed in the filtering cylinder one through the support ring, the motor two is fixedly installed above the support cylinder, one end of the filtering cylinder two close to the support frame two is connected with the output shaft of the motor two through the belt transmission assembly, the output shaft of the motor two drives the filtering cylinder two to rotate through the belt transmission assembly, the filtering cylinder two is fixedly provided with a spiral conveying blade, the filtering cylinder two is connected with the recovery pipeline through the discharging pipe one, a plurality of discharging ports for discharging filtered foreign matters are circumferentially and uniformly arranged at one end of the filtering cylinder two close to the support frame two, the filtering cylinder two drives the spiral conveying blade to rotate, the filtered foreign matters are conveyed to the discharging pipe one, and the filtered foreign matters are discharged into the recovery pipeline through the discharging pipe one to be recovered, a plurality of filtering holes one are uniformly arranged at one side of the filtering cylinder two close to the discharging ports, one side of the filtering cylinder two close to the support ring is arranged as a closed section, a plurality of filtering holes two are uniformly arranged on the filtering cylinder one, the crushing shaft is coaxially rotationally installed in the filtering cylinder two, the filtering cylinder two is coaxially rotationally connected with the feeding cylinder, the crushing shaft penetrates through the support frame two and the belt transmission assembly, and the height of one end of the feeding pipe away from the support base is higher than the height of one end of the filtering cylinder two away from the support base.

[0008] Further, the liquid inlet pipeline comprises a five-way joint, a connecting pipe one, a flat valve one, a pressure gauge, a flat valve two and a four-way joint one, the five-way joint is fixedly installed on the support base, the flat valve one is connected with the five-way joint through the connecting pipe one, the pressure gauge is installed on the flat valve one, the four-way joint one is connected with the feeding pipe through the flat valve two arranged on the two sides of the five-way joint.

[0009] Further, the throttle pipeline comprises a throttle valve, a support frame three, a connecting pipe two, a connecting pipe three and a connecting pipe four, the throttle valve is fixedly installed on the support seat, the throttle valve is connected with the discharge pipe two, the throttle valve is connected with the four-way joint two through the connecting pipe two, the four-way joint two is connected with the flat valve three through the connecting pipe three, the flat valve three is connected with the blow-off pipeline through the connecting pipe four, the support frame three and the four-way joint two are fixedly installed on the support seat, the support frame three is provided in plurality, the throttle valve and the connecting pipe two are connected through a support frame three, the connecting pipe three and the flat valve three are connected through a support frame three, and the flat valve three and the connecting pipe four are connected through a support frame three.

[0010] Further, the blow-off pipeline comprises a four-way joint three, a flat valve four, a connecting pipe five, a support frame four, a connecting pipe six, a four-way joint four and a flat valve five, the four-way joint three, the support frame four, the four-way joint four and the four-way joint five are fixedly installed on the support seat, the connecting pipe five is connected with the five-way joint, the connecting pipe five is connected with the four-way joint 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 joint three is connected with the four-way joint four through the connecting pipe six, the four-way joint four is connected with the four-way joint five through the flat valve five, the four-way joint four and the four-way joint five are connected with the flow monitoring pipeline, and the connecting pipe four is connected with the four-way joint three.

[0011] Further, the flow monitoring pipeline comprises a flow meter, a support frame five, a flat valve six, a four-way joint six, a connecting pipe seven, a four-way joint seven, a connecting pipe eight and a flat valve seven, the support frame five, the four-way joint six and the four-way joint seven are fixedly installed on the support seat, the support frame five is provided in plurality, the flat valve six is connected with the four-way joint four, the flat valve six is connected with the flow meter through a support frame five, the flow meter is connected with the four-way joint six, the four-way joint six is connected with the four-way joint seven through the connecting pipe seven, the four-way joint seven is connected with 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, and the flat valve seven is connected with the four-way joint five.

[0012] Further, the support mechanism comprises a support cylinder and a support frame one, the support frame one is fixedly installed on the support seat, the support cylinder is inclinedly arranged on the support seat through the support frame one, the feeding cylinder and the support frame two are respectively fixedly installed at two ends of the support cylinder, the discharge pipe one is fixedly installed below one end of the support cylinder close to the feeding cylinder, the discharge pipe two is fixedly installed below one end of the support cylinder away from the feeding cylinder, the support cylinder is connected with the throttle pipeline through the discharge pipe two, the filter cylinder one is coaxially fixedly installed in the support cylinder, and the filter cylinder two is coaxially rotatably installed in the support cylinder.

[0013] Further, the belt transmission assembly comprises a belt pulley I, a belt and a belt pulley II, the belt pulley I is coaxially fixedly installed at one end of the filter cylinder II away from the feeding cylinder, the crushing shaft penetrates through the belt pulley I, the belt pulley II is coaxially fixedly installed on the output shaft of the motor II, and the belt pulley I and the belt pulley II are connected through the belt.

[0014] Compared with the prior art, the present application has the following beneficial effects: (1) The present application can fully crush and filter the mud and cuttings in the well through the crushing and filtering assembly. The small-size mud and cuttings after crushing are filtered into the support cylinder from the filter hole one and the filter hole two together with the liquid, and then into the throttle pipeline from the filter cylinder II, while the large-size mud and cuttings that are not completely crushed are thrown out of the filter cylinder II to the outside of the filter cylinder II under the action of centrifugal force, and are conveyed by the rotation of the spiral conveying blades on the filter cylinder II, so that the large-size mud and cuttings can be discharged into the recovery pipeline for recovery treatment, thereby greatly improving the crushing and filtering effect of the liquid, mud and cuttings in the well, avoiding the blockage of the subsequent throttle pipeline, ensuring the stability of the operation of the throttle manifold, solving the technical problem of only crushing or filtering in the prior art, improving the work efficiency and effect, and saving space and cost; (2) The present application can stably realize pressure reduction and monitoring through the two sets of throttle pipelines and the flow monitoring pipeline, can realize one set in operation and one set in standby, thereby preventing the problem that the pressure reduction and monitoring are affected by the failure of one set; (3) The present application can realize blowdown pressure reduction when the throttle pressure reduction cannot meet the requirements, thereby improving the safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the throttle manifold structure of the present application.

[0016] Figure 2 It is a front view of the throttle manifold of the present application.

[0017] Figure 3 It is a top view of the throttle manifold of the present application.

[0018] Figure 4 It is a side view of the throttle manifold of the present application.

[0019] Figure 5 It is a schematic view of the crushing and filtering assembly structure of the present application.

[0020] Figure 6 It is a schematic view of the local structure of the crushing and filtering assembly of the present application. Figure 1 .

[0021] Figure 7 It is a schematic view of the local structure of the crushing and filtering assembly of the present application. 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 end of the liquid inlet pipeline away from the wellhead equipment is connected with a blow-off pipeline, each side of the blow-off pipeline is connected with a throttle pipeline, and the two sides of the blow-off pipeline away from the throttle pipeline are connected with flow monitoring pipelines; the broken filter assembly is used for breaking and filtering the liquid returned from the well, and the broken filter assembly is externally connected with a recovery pipeline for collecting filtered foreign matters; the liquid inlet pipeline, the broken filter assembly, the throttle pipeline, the blow-off pipeline and the flow monitoring pipeline are controlled by an externally connected control system.

[0030] The broken filter assembly comprises a support mechanism, a breaking mechanism and a filtering mechanism, the support mechanism is installed on the support seat 101 and arranged on the side of the liquid inlet pipeline, the breaking mechanism and the filtering mechanism are both obliquely arranged on the support seat 101 through the support mechanism, the breaking mechanism is connected with the liquid inlet pipeline, one end of the filtering mechanism is connected with the throttle pipeline, and the other end of the filtering mechanism is connected with the externally connected recovery pipeline.

[0031] The breaking mechanism comprises a feeding cylinder 303, a feeding pipe 304, a support frame two 307, a motor one 308, a filtering cylinder two 312 and a breaking shaft 317, the feeding cylinder 303 is fixedly installed at one end of the support mechanism, the feeding cylinder 303 is rotationally connected with the filtering mechanism, the support frame two 307 is fixedly installed at the other end of the support mechanism, the feeding pipe 304 is fixedly installed on the feeding cylinder 303, the feeding cylinder 303 is connected with the liquid inlet pipeline through the feeding pipe 304, the motor one 308 is fixedly installed on the support frame two 307, the breaking shaft 317 is coaxially rotationally installed in the feeding cylinder 303, the breaking shaft 317 is arranged in the filtering mechanism, the breaking shaft 317 is coaxially fixedly connected with the output shaft of the motor one 308 by penetrating through the filtering mechanism and the support frame two 307, and a plurality of groups of breaking cones 316 are uniformly and spacedly arranged on the breaking shaft 317, each group of breaking cones 316 is circumferentially and uniformly arranged with a plurality of breaking cones.

[0032] The filtering mechanism comprises a first discharge pipe 305, a second discharge pipe 306, a belt drive assembly 309, a second motor 310, a first filter cylinder 311, a second filter cylinder 312 and a support ring 315. The first discharge pipe 305 is fixedly installed on the support mechanism near one end of the feeding cylinder 303. The second discharge pipe 306 is fixedly installed on the support mechanism away from the feeding cylinder 303. The support mechanism is connected with the throttle pipeline through the second discharge pipe 306. The first filter cylinder 311 is fixedly installed in the support mechanism. The second filter cylinder 312 is rotatably installed in the support mechanism. The support ring 315 is coaxially and fixedly installed inside the first filter cylinder 311 near one end close to the feeding cylinder 303. The second filter cylinder 312 is rotatably installed in the first filter cylinder 311 through the support ring 315. The second motor 310 is fixedly installed above the support cylinder 301. One end of the second filter cylinder 312 close to the second support frame 307 is connected with the output shaft of the second motor 310 through the belt drive assembly 309. The output shaft of the second motor 310 drives the second filter cylinder 312 to rotate through the belt drive assembly 309. The second filter cylinder 312 is fixedly installed with helical conveying blades 313. The second filter cylinder 312 is connected with the recovery pipeline through the first discharge pipe 305. The one end of the second filter cylinder 312 close to the second support frame 307 is uniformly and circularly provided with a plurality of discharge ports 314 for discharging filtered foreign matters. The filtered foreign matters are conveyed to the first discharge pipe 305 through the rotation of the helical conveying blades 313 driven by the second filter cylinder 312, discharged to the recovery pipeline through the first discharge pipe 305 and recovered. The side of the second filter cylinder 312 close to the discharge ports 314 is uniformly provided with a plurality of first filter holes. The side of the second filter cylinder 312 close to the support ring 315 is a closed section. The first filter cylinder 311 is uniformly provided with a plurality of second filter holes. The crushing shaft 317 is coaxially and rotatably installed in the second filter cylinder 312. The second filter cylinder 312 is coaxially and rotatably connected with the feeding cylinder 303. The crushing shaft 317 penetrates through the second support frame 307 and the belt drive assembly 309. The height of one end of the feeding pipe 304 away from the support base 101 is higher than the height of one end of the second filter cylinder 312 away from the support base 101.

[0033] The liquid inlet pipeline comprises a five-way joint 201, a connecting pipe 202, a flat valve 203, a pressure gauge 204, a flat valve 205 and a four-way joint 206. The five-way joint 201 is fixedly installed on the support base 101. The five-way joint 201 is connected with the flat valve 203 through the connecting pipe 202. The flat valve 203 is installed with the pressure gauge 204. The two sides of the five-way joint 201 are connected with the four-way joint 206 through the flat valve 205. The four-way joint 206 is connected with the feeding pipe 304.

[0034] The throttle pipeline comprises a throttle valve 401, a support frame three 402, a connecting pipe two 403, a connecting pipe three 405, and a connecting pipe four 407. The throttle valve 401 is fixedly installed on the support seat 101, and is connected with the discharge pipe two 306. The throttle valve 401 is connected with a four-way joint two 404 through the connecting pipe two 403. The four-way joint two 404 is connected with a flat valve three 406 through the connecting pipe three 405. The flat valve three 406 is connected with the blow-off pipeline through the connecting pipe four 407. The support frame three 402 and the four-way joint two 404 are both fixedly installed on the support seat 101. The support frame three 402 is provided in plurality. The throttle valve 401 and the connecting pipe two 403 are connected through one support frame three 402. The connecting pipe three 405 and the flat valve three 406 are connected through one support frame three 402. The flat valve three 406 and the connecting pipe four 407 are connected through one support frame three 402.

[0035] The blow-off pipeline comprises a four-way joint 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 joint four 506, and a flat valve five 507. The four-way joint three 501, the support frame four 504, the four-way joint four 506, and a four-way joint five 508 are all fixedly installed on the support seat 101. The connecting pipe five 503 is connected with the five-way joint 201. The connecting pipe five 503 is connected with the four-way joint three 501 through the flat valve four 502. The flat valve four 502 and the connecting pipe five 503 are connected through the support frame four 504. The four-way joint three 501 is connected with the four-way joint four 506 through the connecting pipe six 505. The four-way joint four 506 is connected with the four-way joint five 508 through the flat valve five 507. The four-way joint four 506 and the four-way joint five 508 are both connected with the flow monitoring pipeline. The connecting pipe four 407 is connected with the four-way joint three 501.

[0036] The flow monitoring pipeline comprises a flow meter 601, a support frame five 602, a flat valve six 603, a four-way joint six 604, a connecting pipe seven 605, a four-way joint seven 606, a connecting pipe eight 607, and a flat valve seven 608. The support frame five 602, the four-way joint six 604, and the four-way joint seven 606 are all fixedly installed on the support seat 101. The support frame five 602 is provided in plurality. The flat valve six 603 is connected with the four-way joint four 506. The flat valve six 603 is connected with the flow meter 601 through one support frame five 602. The flow meter 601 is connected with the four-way joint six 604. The four-way joint six 604 is connected with the four-way joint seven 606 through the connecting pipe seven 605. The four-way joint seven 606 is connected with the flat valve seven 608 through the connecting pipe eight 607. The connecting pipe eight 607 and the flat valve seven 608 are connected through one support frame five 602. The flat valve seven 608 is connected with the four-way joint five 508.

[0037] The supporting mechanism comprises a supporting cylinder 301 and a supporting frame 302, the supporting frame 302 is fixedly installed on the supporting base 101, the supporting cylinder 301 is obliquely arranged on the supporting base 101 through the supporting frame 302, a feeding cylinder 303 and a supporting frame 307 are respectively fixedly installed at two ends of the supporting cylinder 301, a discharging pipe 305 is fixedly installed below one end of the supporting cylinder 301 close to the feeding cylinder 303, a discharging pipe 306 is fixedly installed below one end of the supporting cylinder 301 away from the feeding cylinder 303, the supporting cylinder 301 is connected with the throttling pipeline through the discharging pipe 306, a filtering cylinder 311 is coaxially fixedly installed in the supporting cylinder 301, and a filtering cylinder 312 is coaxially rotatably installed in the supporting cylinder 301.

[0038] The belt driving assembly 309 comprises a belt pulley 1, a belt and a belt pulley 2, the belt pulley 1 is coaxially fixedly installed at one end of the filtering cylinder 312 away from the feeding cylinder 303, a crushing shaft 317 penetrates through the belt pulley 1, the belt pulley 2 is coaxially fixedly installed on the output shaft of the motor 2 310, and the belt pulley 1 and the belt pulley 2 are connected through the belt.

[0039] The working principle of the present application is as follows: When the crushing and filtering assembly works: the downhole liquid (mud, debris, etc.) enters the feeding pipe 304 into the feeding cylinder 303, and then enters the filtering cylinder two 312, the output shaft of the motor one 308 drives the crushing shaft 317 to rotate, and the crushing shaft 317 drives the plurality of crushing cones 316 to rotate, at the same time, the output shaft of the crushing cone 316 drives the belt pulley two on the belt transmission assembly 309 to rotate, the belt pulley two drives the belt pulley one to rotate through the belt, and the belt pulley one drives the filtering cylinder two 312 to rotate, it should be noted that the rotating directions of the filtering cylinder two 312 and the crushing shaft 317 are opposite, so that the mud and debris in the filtering cylinder two 312 can fully contact with the crushing cone 316, so as to improve the crushing effect of the mud and debris in the filtering cylinder two 312, since the crushing and filtering assembly is inclined (the height of one end of the feeding pipe 304 away from the support base 101 is higher than the height of one end of the filtering cylinder two 312 away from the support base 101), and the side of the filtering cylinder two 312 close to the support ring 315 is set as a closed section, therefore, the liquid entering the filtering cylinder two 312 will not directly fall into the discharge pipe one 305 below, avoiding the problem that the liquid directly flows out from the discharge pipe one 305, the plurality of crushing cones 316 rotate to crush the large-size mud and debris in the liquid, the small-size mud and debris after crushing enter the filtering cylinder one 311 from the filtering hole one together with the liquid, and then enter the support cylinder 301 from the filtering hole two on the filtering cylinder one 311, and then enter the throttle pipeline from the discharge pipe two 306, while the large-size mud and debris that are not completely crushed are thrown out of the filtering cylinder two 312 from the discharge port 314 under the action of centrifugal force, and are moved to the direction of the discharge pipe one 305 along with the helical conveying blade 313 through the rotation of the helical conveying blade 313 on the filtering cylinder two 312, and are discharged from the discharge pipe one 305 to the recycling pipeline for recycling treatment, thereby greatly improving the crushing and filtering effect of the downhole liquid, mud and debris, avoiding the blockage of the subsequent throttle pipeline, ensuring the stability of the operation of the throttle manifold, and solving the technical problems that the prior art can only crush or filter separately, improving the working efficiency and effect, and saving space and cost.

[0040] When one side of the throttle pipeline needs to work to reduce pressure, open the flat valve two 205 on the corresponding side of the liquid inlet pipeline and the flat valve three 406 in the corresponding throttle pipeline, and at the same time, make the flat valve two 205 and the flat valve three 406 on the other side closed, and close the flat valve four 502. If the flow monitoring pipeline is not needed to monitor the flow of the throttle pipeline, close the two flat valve six 603, the flat valve seven 608, open the flat valve five 507, and the downhole liquid passes through the five-way joint 201, the flat valve two 205, the four-way joint one 206, enters the crushing and filtering assembly for crushing and filtering, then passes through the throttle valve 401 for pressure reduction, and then passes through the connecting pipe two 403, the four-way joint two 404, the connecting pipe three 405, the flat valve three 406, the connecting pipe four 407 into the four-way joint three 501, and then passes through the four-way joint three 501, the connecting pipe six 505, the four-way joint four 506, the flat valve five 507 and the four-way joint five 508 to be discharged into the external recovery tank. If the flow monitoring pipeline is needed to monitor the flow of the throttle pipeline, close the flat valve five 507, open one side of the flat valve six 603 and the flat valve seven 608, and the downhole liquid passes through the five-way joint 201, the flat valve two 205, the four-way joint one 206, enters the crushing and filtering assembly for crushing and filtering, then passes through the throttle valve 401 for pressure reduction, and then passes through the connecting pipe two 403, the four-way joint two 404, the connecting pipe three 405, the flat valve three 406, the connecting pipe four 407 into the four-way joint three 501, and then passes through the four-way joint three 501, the connecting pipe six 505, the four-way joint four 506, the flat valve six 603 into the flow meter 601 for flow monitoring, and then passes through the four-way joint six 604, the four-way joint seven 606, the connecting pipe eight 607, the flat valve seven 608 and the four-way joint five 508 to be discharged into the external recovery tank, so as to facilitate monitoring the flow of the throttle pipeline through the flow monitoring pipeline.

[0041] When the pressure is too high and the throttle pipeline cannot meet the pressure reduction requirement, open the flat valve four 502 and the flat valve five 507, and close the two flat valve two 205, the flat valve six 603 and the flat valve seven 608, and use the blow-off pipeline for blow-off pressure reduction. When blow-off pressure reduction, the downhole liquid passes through the connecting pipe five 503, the flat valve four 502, the four-way joint three 501, the connecting pipe six 505, the four-way joint four 506, the flat valve five 507 and the four-way joint five 508 to be discharged into the recovery tank.

[0042] It should be particularly noted that when pressure reduction is performed, only one side of the throttle pipeline is used, and the other side is used as a backup. When one of the throttle pipelines fails, the other one is used for pressure reduction to avoid the failure of the throttle pipeline also unable to achieve the requirement of pressure reduction. In addition, the two flow monitoring pipelines can monitor the flow of the two throttle pipelines, and only one flow monitoring pipeline is used to monitor the flow of one throttle pipeline each time, so as to ensure 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.

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