Pressure control device for pressure-controlled drilling

Abstract

The utility model belongs to the technical field of well drilling pressure control, and particularly relates to a pressure control well drilling pressure control device which comprises a well control body, a first mud return pipeline installed on the well control body and a conveying pipe arranged on one side of the first mud return pipeline. A cleaning assembly is mounted between the first slurry return pipeline and the conveying pipe; the cleaning assembly comprises a treatment box arranged between the first slurry returning pipeline and the conveying pipe, a first connecting pipe fixed to one end of the first slurry returning pipeline and a second connecting pipe fixed to the surface of the first slurry returning pipeline in a communicating mode. The impurity rock debris filtered by the filter screen can be cleaned without stopping the equipment, the shutdown waiting time is less, the working continuity is more ideal, the labor intensity of workers is reduced, and the use effect of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling pressure control, and in particular relates to a pressure control device for pressure-controlled drilling. Background Art

[0002] With the rapid development of drilling technology, the development trend of oil exploration in the world has shifted from shallow wells to deep wells and ultra-deep wells. Ultra-deep wells refer to wells with a depth of 6000m to 8000m. The deeper the well, the more sensitive the formation is to the density of the drilling fluid. In the process of drilling in a narrow pressure window of high-temperature and high-pressure ultra-deep well containing hydrogen sulfide, overflow or leakage will cause serious consequences. Generally, in order to prevent the occurrence of overflow, a sufficient positive pressure difference is maintained at the bottom of the well. When designing the drilling fluid, the fine pressure-controlled drilling technology takes the drilling state as the standard. When designing the drilling fluid, it is required that the bottom hole pressure is equal to the formation pressure during the drilling process to achieve the purpose of safe drilling. The method of realization is to realize dynamic and adaptive control of the annulus pressure through the combination of pressure-controlled drilling equipment and process technology. However, due to Due to the uncertainty of geological conditions and formation heterogeneity, formation pressure prediction is inaccurate, and the pressure in some formations is too high, which poses the risk of overflow accidents. During fine pressure-controlled drilling, the density of the drilling fluid is unevenly distributed. In order to maintain a constant bottomhole pressure, throttling operations must be performed continuously. The throttle valve is always in operation, resulting in high equipment wear and tear. Conventional drilling methods use simple drilling equipment with low operating costs, but cannot apply back pressure at the wellhead, making them unsuitable for high-temperature, high-pressure, ultra-deep wells with narrow pressure windows. The drilling equipment used in fine pressure-controlled drilling can effectively control wellbore pressure by adjusting the wellhead back pressure during drilling in high-temperature, high-pressure, ultra-deep wells with narrow pressure windows, but it has the problems of complex equipment, high equipment wear and tear, high drilling costs, and the need for a professional team for on-site implementation, making it difficult to promote.

[0003] Upon investigation, the publication (announcement) number CN210768666U discloses an ultra-deep well drilling pressure control device. This technology discloses "including a mud input pipeline, a first mud return pipeline, a second mud return pipeline, a well killing pipeline, a back-pressure pipeline, a choke pipeline and a well control device; one end of the well killing pipeline is connected to the inlet of the well control device base, and the other end is connected to the mud input pipeline; a back-pressure pipeline is provided between the mud input pipeline and the first mud return pipeline. The technical solution has the advantages of eliminating equipment such as a back-pressure pump, simplifying the control device of the choke pipeline, reducing equipment costs, simplifying on-site construction processes, and ensuring safe and efficient pressure control. Even in the event of drilling suspension and equipment loss of control, a positive pressure differential at the bottom of the well can be maintained to prevent overflow and other complex situations downhole."

[0004] When the above design is used, although it eliminates the need for equipment such as a back pressure pump, simplifies the control device of the throttling pipeline, reduces equipment costs, simplifies on-site construction processes, and is safe and efficient in terms of pressure control, it often requires personnel to regularly stop the machine to clean the impurities and rock chips filtered by the filter screen, which consumes a lot of downtime and waiting time, resulting in unsatisfactory work continuity, increased labor intensity of the staff, and reduced use effect of the device;

[0005] In order to solve the above problems, this application proposes a pressure control device for managed pressure drilling. Utility Model Content

[0006] In order to solve the problems raised in the above background technology, the utility model provides a pressure control device for pressure-controlled drilling, which has the characteristics of not needing to stop the equipment to clean the impurities and cuttings filtered by the filter screen, consuming less downtime and waiting time, making the work continuity more ideal, while reducing the labor intensity of the staff and improving the use effect of the device.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a pressure control device for managed pressure drilling, comprising a well control body, a first mud return line installed on the well control body, and a delivery pipe arranged on one side of the first mud return line, a flow meter fixedly installed on the delivery pipe, and a cleaning assembly installed between the first mud return line and the delivery pipe;

[0008] The cleaning assembly includes a processing box arranged between the first mud return pipeline and the conveying pipe, a first connecting pipe fixed at one end of the first mud return pipeline, and a second connecting pipe connected and fixed to the surface of the first mud return pipeline, the interior of the first connecting pipe is installed with a control valve 1, the interior of the second connecting pipe is installed with a control valve 2, the interior of the processing box is fixedly welded with a partition, the interior of the processing box is divided into a first chamber and a second chamber by the partition, the first chamber and the second chamber are both provided with filter screens, one end of the first connecting pipe and the second connecting pipe are fixedly connected to the processing box, one side of the processing box is installed with symmetrically arranged driving push rods, the output end of the driving push rod is fixed with a guide rod by a screw, one end of the guide rod is fixed with a sealing plate, and the surface of the guide rod is also fixed with a push plate, and a discharge port is opened on the side of the processing box surface close to the sealing plate.

[0009] As a preferred pressure control device for pressure-controlled drilling of the utility model, one end of the delivery pipe is fixed to the surface of the processing box and is connected to the processing box, and each side of the filter screen is fixedly connected to the surface of the processing box and the partition respectively, and the first connecting pipe and the second connecting pipe correspond to the first chamber and the second chamber respectively, and are connected to the processing box, and a U-shaped plate is fixedly installed on one side of the processing box by bolts, and two groups of driving push rods are fixed to the surface of the U-shaped plate by bolts, and the push plate is located inside the processing box, and the sealing plate is located outside the processing box, and the partition is designed to be non-contact with the bottom of the processing box, and a through hole is opened on the surface of the processing box to match the guide rod, and the guide rod and the processing box are slidably connected through this through hole, and a sealing ring is provided in the through hole, and the sealing ring is fixedly connected to the processing box and fits tightly with the surface of the guide rod.

[0010] As a preferred embodiment of the pressure control device for managed pressure drilling of the present invention, the bottom of the push plate is in contact with the surface of the filter screen.

[0011] As a preferred embodiment of the pressure control device for managed pressure drilling of the present invention, a sealing gasket is fixedly mounted on the inner side wall of the blocking plate.

[0012] As a preferred embodiment of the pressure control device for pressure-controlled drilling of the present invention, a receiving box is fixedly mounted on one side of the processing box by bolts, and a sewage inlet is provided on a side of the surface of the receiving box close to the two sets of blocking plates.

[0013] As a preferred pressure control device for pressure-controlled drilling of the utility model, a driving motor is fixedly installed on one side of the storage box by bolts, a spiral conveying rod is fixed to the output end of the driving motor, the spiral conveying rod is rotatably connected to the storage box through a bearing, the spiral conveying rod is located at the bottom of the inner cavity of the storage box, a circular opening is opened on the side of the storage box away from the driving motor, a sealing disk is provided on the side of the storage box close to the circular opening, and the sealing disk is fixedly connected to the storage box by two sets of fastening bolts.

[0014] As a preferred embodiment of the pressure control device for managed pressure drilling of the present invention, an adapter cover adapted to the spiral conveying rod is fixedly mounted on the bottom of the inner cavity of the storage box, and the surfaces of the spiral conveying rod and the adapter cover are in contact with each other.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By setting up a cleaning component, there is no need to stop the equipment to clean the impurities and rock chips filtered by the filter screen, which consumes less downtime and waiting time, making work continuity more ideal, while reducing the labor intensity of the staff and improving the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a structural cross-sectional view of the storage box in the present invention;

[0020] Figure 3 This is a top sectional view of the structure of the processing box in the utility model;

[0021] Figure 4 This is a side sectional view of the structure of the processing box in the utility model.

[0022] In the figure: 1. Well control body; 2. First mud return pipeline; 3. Delivery pipe; 4. Flow meter; 5. Cleaning assembly; 501. Processing box; 502. First connecting pipe; 503. Second connecting pipe; 504. Control valve 1; 505. Control valve 2; 506. U-shaped plate; 507. Drive push rod; 508. Filter screen; 509. Partition; 510. Push plate; 511. Sealing plate; 512. Sealing gasket; 513. Storage box; 514. Drive motor; 515. Screw delivery rod; 516. Adapter cover; 517. Sealing disk; 518. Guide rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figure 1 As shown:

[0026] A pressure control device for managed pressure drilling comprises a well control body 1, a first mud return pipeline 2 installed on the well control body 1, and a delivery pipe 3 arranged on one side of the first mud return pipeline 2. A flow meter 4 is fixedly installed on the delivery pipe 3.

[0027] In this embodiment: the existing device {publication (announcement) number}: CN210768666U discloses an ultra-deep well drilling pressure control device. The well control body 1 in this application document adopts the same technical means in this prior art. This technical means will not be described in detail here. This application makes further improvements to this existing body. For details, please refer to the disclosed technology below; in order to solve the technical problems existing in this prior art, as disclosed in the background technology above, "the above-mentioned design, when used, eliminates the need for equipment such as a back pressure pump, simplifies the control device of the throttling pipeline, reduces equipment costs, simplifies the on-site construction process, and is safe and efficient in pressure control. However, the method of filtering and intercepting by a simple filter box in combination with a filter screen often requires personnel to regularly shut down the machine to clean the impurities and rock chips filtered by the filter screen, which consumes a lot of downtime waiting time, the work continuity is not ideal, and the labor intensity of the staff is increased, reducing the use effect of the device." In terms of use, this problem is obviously a real and difficult problem to solve. In view of this, in order to solve this technical problem, a cleaning component 5 is added to the application document. The electrical equipment involved in this product is all powered by an external power supply.

[0028] More specifically:

[0029] like Figure 1-Figure 4 As shown:

[0030] In combination with the above content: a cleaning assembly 5 is installed between the first mud return pipeline 2 and the delivery pipe 3, and the cleaning assembly 5 includes a processing box 501 arranged between the first mud return pipeline 2 and the delivery pipe 3, a first connecting pipe 502 fixed at one end of the first mud return pipeline 2, and a second connecting pipe 503 connected and fixed to the surface of the first mud return pipeline 2, a control valve 1 504 is installed inside the first connecting pipe 502, a control valve 2 505 is installed inside the second connecting pipe 503, a partition 509 is fixedly welded inside the processing box 501, and the processing box 501 The interior is divided into a first chamber and a second chamber by a partition 509. The first chamber and the second chamber are both provided with a filter screen 508. One end of the first connecting pipe 502 and the second connecting pipe 503 are fixedly connected to the processing box 501. One side of the processing box 501 is installed with symmetrically arranged driving push rods 507. The output end of the driving push rod 507 is fixedly installed with a guide rod 518 by screws. A sealing plate 511 is fixed to one end of the guide rod 518. A push plate 510 is also fixedly installed on the surface of the guide rod 518. A discharge port is opened on the side of the surface of the processing box 501 near the sealing plate 511.

[0031] One end of the conveying pipe 3 is fixed on the surface of the processing box 501 and is connected to the processing box 501. The side surfaces of the filter screen 508 are fixedly connected to the surfaces of the processing box 501 and the partition 509 respectively. The first connecting pipe 502 and the second connecting pipe 503 correspond to the first chamber and the second chamber respectively, and are connected to the processing box 501. A U-shaped plate 506 is fixedly installed on one side of the processing box 501 by bolts. Two sets of driving push rods 507 are fixed to the surface of the U-shaped plate 506 by bolts. The push plate 510 is located inside the processing box 501, and the sealing plate 511 is located outside the processing box 501. The partition 509 is designed to be non-contact with the bottom of the processing box 501. A through hole compatible with the guide rod 518 is opened on the surface of the processing box 501. The guide rod 518 and the processing box 501 are slidably connected through this through hole. A sealing ring is provided in the through hole, and the sealing ring is fixedly connected to the processing box 501 and fits tightly with the surface of the guide rod 518.

[0032] In this embodiment, when the pressure-controlled drilling pressure control device is in use, the returned mud first enters the processing box 501 through the first mud return pipeline 2, and then passes through the filter 508 inside the processing box 501 for filtration. The filtered liquid flows to the right through the delivery pipe 3 and enters the flow meter 4. The flow meter 4 measures the mud passing amount. During this process, when it is necessary to clean the large particles of impurities and cuttings filtered by the filter 508, a PLC controller (not shown in the figure) is used to control a group of driving push rods 507 to start, and at the same time control the control Valve 1 504 and control valve 2 505 make control valve 1 504 close the first connecting pipe 502 to block, and control valve 2 505 opens the second connecting pipe 503 to release the blockage. At this time, mud enters the second chamber and is filtered through the filter 508, and then enters the inside of the delivery pipe 3. At the same time, no mud will enter the first chamber, so that it is convenient to clean the large particles of impurities and rock chips filtered by the first chamber. In this process, the push rod 507 is driven to start and the guide rod 518 is driven to extend. The push plate 510 is moved, and the blocking plate 511 is moved synchronously. The blocking of the discharge port is released by the movement of the blocking plate 511. At the same time, the push plate 510 moves and the large particles of impurities and debris filtered by the filter screen 508 are discharged from the discharge port. After the cleaning is completed, the push rod 507 is reset and the push plate 510 and the blocking plate 511 are reset. At this time, the blocking plate 511 blocks the discharge port again. When cleaning is performed again later, the PLC controller controls the control valve 504 and Control valve 2 505 causes control valve 1 504 to open the first connecting pipe 502 to release the blockage, and at the same time control valve 2 505 closes the second connecting pipe 503 to seal it. At this time, the mud enters the first chamber through the first connecting pipe 502, and it is convenient to clean the second chamber. Through this operation, when cleaning, there is no need to stop the equipment to clean the impurities and rock chips filtered by the filter screen 508, which consumes less downtime and waiting time, and the work continuity is more ideal. At the same time, the labor intensity of the staff is reduced and the use effect of the device is improved.

[0033] It should be noted that the PLC controller can periodically start the driving push rod 507, control valve 1 504 and control valve 2 505 to start, which is well known to those skilled in the art and is a conventional means or common knowledge. Those skilled in the art can make any selection according to their needs or convenience. The CNC programming control method of the programmable controller well known to those skilled in the art is a conventional means or common knowledge and will not be repeated here.

[0034] Going further;

[0035] In an optional embodiment, the bottom of the push plate 510 is in contact with the surface of the filter screen 508 .

[0036] In this embodiment, the bottom of the push plate 510 is in contact with the surface of the filter screen 508 , which can provide a better cleaning effect for the impurities and debris on the filter screen 508 .

[0037] Going further;

[0038] In an optional embodiment, a sealing gasket 512 is fixedly mounted on the inner wall of the blocking plate 511 .

[0039] In this embodiment, the blocking plate 511 blocks the discharge port again. At this time, the provision of the sealing gasket 512 can increase the sealing performance between the blocking plate 511 and the processing box 501, thereby improving the blocking effect.

[0040] Going further;

[0041] In an optional embodiment, a receiving box 513 is fixedly installed on one side of the processing box 501 by bolts, and a sewage inlet is opened on the surface of the receiving box 513 on one side close to the two sets of blocking plates 511.

[0042] In this embodiment, the push plate 510 pushes the filtered impurity rock chips out of the discharge port and enters the interior of the receiving box 513 through the sewage inlet, and the pushed impurity rock chips are collected by the receiving box 513.

[0043] Going further;

[0044] In an optional embodiment, a drive motor 514 is fixedly installed on one side of the storage box 513 by bolts, and a spiral conveying rod 515 is fixed to the output end of the drive motor 514. The spiral conveying rod 515 is rotatably connected to the storage box 513 through a bearing, and the spiral conveying rod 515 is located at the bottom of the inner cavity of the storage box 513. A circular opening is provided on the side of the storage box 513 away from the drive motor 514, and a sealing disk 517 is provided on the side of the storage box 513 close to the circular opening. The sealing disk 517 is fixedly connected to the storage box 513 by two sets of fastening bolts.

[0045] In this embodiment: when it is necessary to discharge the impurities and rock chips inside the storage box 513, the sealing disk 517 is then opened, and then the drive motor 514 is started, thereby driving the spiral conveying rod 515 to rotate. Through the rotation of the spiral conveying rod 515, the impurities and rock chips inside the storage box 513 can be better discharged.

[0046] Going further;

[0047] In an optional embodiment, an adapting cover 516 adapted to the spiral conveying rod 515 is fixedly installed at the bottom of the inner cavity of the storage box 513, and the surfaces of the spiral conveying rod 515 and the adapting cover 516 are in contact with each other.

[0048] In this embodiment, by providing the adapter cover 516 , the impurities and rock chips are collected in the adapter cover 516 , so that the impurities and rock chips can be discharged better, thereby improving the cleaning effect and making the cleaning more thorough.

[0049] The working principle and use process of the utility model are as follows: when the pressure-controlled drilling pressure control device is in use, the returned mud first enters the processing box 501 through the first mud return pipeline 2, and then passes through the filter 508 inside the processing box 501 for filtration. The filtered liquid enters the flow meter 4 to the right through the delivery pipe 3. The flow meter 4 measures the mud passing amount. During this process, when it is necessary to clean the large particles of impurities and rock cuttings filtered by the filter 508, a PLC controller (not shown in the figure) is used to control a group of driving push rods 507 to start, and at the same time control the control valve 1 504 and the control valve 2 505, so that the control valve 1 504 closes the first connecting pipe 502 for sealing, and the control valve 2 505 opens the second connecting pipe 503 for sealing. The blockage is released, and the mud enters the second chamber and is filtered through the filter screen 508, and then enters the inside of the conveying pipe 3. At the same time, no mud will enter the first chamber, which makes it convenient to clean the large particles of impurities and rock debris filtered by the first chamber. In this process, the push rod 507 is driven to start and the guide rod 518 is extended. The guide rod 518 drives the push plate 510 to move, and at the same time drives the blocking plate 511 to move synchronously. The movement of the blocking plate 511 is used to release the blockage of the discharge port, and at the same time, the push plate 510 moves, and the large particles of impurities and rock debris filtered by the filter screen 508 are discharged from the discharge port. After cleaning is completed, the push rod 507 is driven to reset, and the push plate 510 and the blocking plate 511 are driven to move. After the closure is reset, the blocking plate 511 blocks the discharge port again. At this time, the setting of the sealing gasket 512 can increase the sealing performance between the blocking plate 511 and the processing box 501, thereby improving the blocking effect. When cleaning is performed again in the later stage, the PLC controller controls the control valve 1 504 and the control valve 2 505, so that the control valve 1 504 opens the first connecting pipe 502 to release the blockage, and the control valve 2 505 closes the second connecting pipe 503 for blocking. At this time, the mud enters the first chamber through the first connecting pipe 502, and it is convenient to clean the second chamber. Through this operation, when cleaning, there is no need to stop the equipment to clean the impurities and rock chips filtered by the filter screen 508, which consumes less downtime and waiting time, and the work continuity is better. Ideal, while reducing the labor intensity of the staff and improving the use effect of the device, the push plate 510 pushes the filtered impurity rock chips out of the discharge port and enters the interior of the receiving box 513 through the sewage inlet, and the pushed impurity rock chips are collected by the receiving box 513. When the impurity rock chips inside the receiving box 513 need to be discharged, the sealing disk 517 is then opened, and then the drive motor 514 is started, thereby driving the spiral conveying rod 515 to rotate. Through the rotation of the spiral conveying rod 515, the impurity rock chips inside the receiving box 513 can be better discharged. At the same time, through the setting of the adapter cover 516, the impurity rock chips are gathered into the adapter cover 516, which can better discharge the impurity rock chips, improve the cleaning effect, and make the cleaning more thorough.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressure control device for managed pressure drilling, comprising a well control body (1), a first mud return line (2) installed on the well control body (1), and a delivery pipe (3) arranged on one side of the first mud return line (2), wherein a flow meter (4) is fixedly installed on the delivery pipe (3), characterized in that: A cleaning assembly (5) is installed between the first mud return pipeline (2) and the delivery pipe (3); The cleaning assembly (5) comprises a treatment box (501) arranged between the first mud return pipeline (2) and the delivery pipe (3), a first connecting pipe (502) fixed at one end of the first mud return pipeline (2), and a second connecting pipe (503) connected and fixed on the surface of the first mud return pipeline (2), a control valve 1 (504) is installed inside the first connecting pipe (502), a control valve 2 (505) is installed inside the second connecting pipe (503), a partition (509) is fixedly welded inside the treatment box (501), and the interior of the treatment box (501) is divided into a first chamber and a second chamber by the partition (509). The first chamber and the second chamber are both provided with a filter screen (508), one end of the first connecting pipe (502) and the second connecting pipe (503) are fixedly connected to the processing box (501), one side of the processing box (501) is equipped with symmetrically arranged driving push rods (507), the output end of the driving push rod (507) is fixedly installed with a guide rod (518) by a screw, one end of the guide rod (518) is fixed with a sealing plate (511), and the surface of the guide rod (518) is also fixedly installed with a push plate (510), and a discharge port is provided on the side of the surface of the processing box (501) close to the sealing plate (511).

2. The pressure control device for managed pressure drilling according to claim 1, characterized in that: One end of the delivery pipe (3) is fixed to the surface of the processing box (501) and is connected to the processing box (501). The sides of the filter screen (508) are fixedly connected to the surface of the processing box (501) and the partition (509). The first connecting pipe (502) and the second connecting pipe (503) correspond to the first chamber and the second chamber respectively and are connected to the processing box (501). A U-shaped plate (506) is fixedly installed on one side of the processing box (501) by bolts. The two sets of driving push rods (507) are fixed by bolts. On the surface of the U-shaped plate (506), the push plate (510) is located inside the processing box (501), the blocking plate (511) is located outside the processing box (501), the partition (509) is designed to be non-contact with the bottom of the processing box (501), and a through hole compatible with the guide rod (518) is opened on the surface of the processing box (501). The guide rod (518) and the processing box (501) are slidably connected through this through hole. A sealing ring is provided in the through hole, and the sealing ring is fixedly connected to the processing box (501) and tightly fits the surface of the guide rod (518).

3. The pressure control device for managed pressure drilling according to claim 1, characterized in that: The bottom of the push plate (510) is in contact with the surface of the filter screen (508).

4. The pressure control device for managed pressure drilling according to claim 2, characterized in that: A sealing gasket (512) is fixedly mounted on the inner side wall of the blocking plate (511).

5. The pressure control device for managed pressure drilling according to claim 1, characterized in that: A receiving box (513) is fixedly mounted on one side of the processing box (501) by means of bolts, and a sewage inlet is provided on a side of the surface of the receiving box (513) close to the two sets of blocking plates (511).

6. The pressure control device for managed pressure drilling according to claim 5, characterized in that: A driving motor (514) is fixedly installed on one side of the storage box (513) by means of bolts. A spiral conveying rod (515) is fixed to the output end of the driving motor (514). The spiral conveying rod (515) is rotatably connected to the storage box (513) via a bearing. The spiral conveying rod (515) is located at the bottom of the inner cavity of the storage box (513). A circular opening is provided on the side of the storage box (513) away from the driving motor (514). A sealing disk (517) is provided on the side of the storage box (513) close to the circular opening. The sealing disk (517) is fixedly connected to the storage box (513) by means of two sets of fastening bolts.

7. The pressure control device for managed pressure drilling according to claim 6, characterized in that: An adapting cover (516) adapted to the spiral conveying rod (515) is fixedly mounted on the bottom of the inner cavity of the storage box (513), and the surfaces of the spiral conveying rod (515) and the adapting cover (516) are in contact with each other.

Images