A manually operated single rotary lever control dual flapper blowout preventer and sealing method

Abstract

This invention discloses a manually operated single-rotor-controlled double-gate blowout preventer (BOP) device and sealing method. The device includes a flange housing, a fully sealed gate assembly, a fully sealed gate moving piston, a semi-sealed gate assembly, and a semi-sealed gate moving piston; it also includes a linkage control mechanism; the linkage control mechanism is mounted on the fully sealed gate moving piston; the semi-sealed gate moving piston has a structure for connecting the linkage control mechanism. This invention can be used to prevent blowouts and well kicks during routine drilling and workover operations. While it adopts a conventional BOP gate structure design, its structure and method of pushing the gate sealing tubing and wellhead differ from conventional BOPs. This device allows a single rotating rod to push both the semi-sealed and fully sealed gates through a conversion rod to seal the tubing and wellhead.

Description

Technical Field

[0001] This invention relates to the field of drilling and repair technology for deep, low-permeability oil reservoirs, specifically to a manually operated single-rotor-controlled double-gate blowout preventer and its sealing method. Background Technology

[0002] In deep, low-permeability oil reservoir operations, where pressure is high, double-gate blowout preventers (BOPs), also known as full-sealed or semi-sealed gate BOPs, are commonly used in oil and water well operations to prevent pressure surges and ensure on-site safety. Conventional double-gate BOPs are widely used as core components of field well control equipment. However, due to their large size (approximately 520 kg and 600 mm in height), they increase wellhead height, causing inconvenience during construction. Furthermore, their installation, dismantling, and transportation require multiple personnel for hoisting, resulting in lengthy relocation times, high labor intensity, complex procedures, and significant risks of mechanical injury.

[0003] Therefore, in response to this situation, a manual single-rotation lever controlled double-gate blowout preventer and sealing method suitable for routine minor repair operations were invented.

[0004] Publication (Announcement) No.: CN103806859A, Publication (Announcement) Date: 2014-05-21 discloses a highly practical double-gate blowout preventer, including a body, a side door, an upper flange connected to the upper surface of the body, a lower flange connected to the lower surface of the body, a semi-sealed gate sealing core assembly, a fully sealed gate sealing core assembly, and a gate shaft seal. The body is equipped with two layers of sealing gates: the upper layer is the semi-sealed gate sealing core assembly, and the lower layer is the fully sealed gate sealing core assembly. The gate shaft seal is located between the semi-sealed and fully sealed gate sealing core assemblies. The side door is installed on the side of the body. This structure divides the body into two layers, allowing the gate to be closed both when tubing is present and when no tubing is present, providing different treatments for different situations, resulting in better blowout prevention and expanding its application range.

[0005] Publication (Announcement) No.: CN105781470A, Publication (Announcement) Date: 2016-07-20. This invention provides a gate blowout preventer with a double-layer pressure relief and balancing valve assembly, including a main body, an upper flange, a tubing insert, a gate blowout preventer drive device, a double-layer pressure relief and balancing valve assembly, and an annular hollow capsule. The main body has a vertical cavity penetrating its upper and lower ends. The lower end of the tubing insert is inserted into the cavity of the main body, and the upper end is connected to the main body via the upper flange. The annular hollow capsule is located between the tubing insert and the cavity wall of the main body, and is situated at the upper part of the main body. Multiple gate blowout preventer drive devices are symmetrically arranged on both sides of the main body and communicate with the cavities of the main body. A double-layer pressure relief and balancing valve assembly is provided on the front of the main body. The channels of the double-layer pressure relief and balancing valve assembly are connected to the channels at the upper and lower positions of the gate hole in the main body. Operating each valve assembly achieves hydraulic pressure relief and balancing between the gate layers and the annular blowout preventer.

[0006] Publication (Announcement) No.: CN110080711A, Publication (Announcement) Date: 2019-08-02. Belonging to the field of petroleum equipment technology, this invention relates to a gate blowout preventer, specifically a gate blowout preventer with composite side doors. It includes a housing with a built-in gate and side doors on both sides of the housing. A gate shaft, connected to the gate, passes through the side doors. The key feature is that the side doors include an outer door and an inner door. The outer door is bolted to the housing, while the inner door's front end is positioned within the outer door's cavity using a claw-type connecting device. The inner door has a cavity and mounting hole adapted to the gate and gate shaft. An opening / closing rod passes through the inner and outer doors and is positioned on the housing. Both the inner and outer doors have direct opening and closing freedom along the opening / closing rod. The double-layer side door structure, with the inner door capable of opening and closing independently, makes the overall side door structure compact, effortless, and quick to operate.

[0007] Publication (Announcement) No.: CN111155956A, Publication (Announcement) Date: 2020-05-15 discloses a dual-piston composite dual-gate blowout preventer and a method for suspending tubing and sealing the wellhead. The device includes a housing, within which symmetrically installed, from top to bottom, a shearing full-sealing gate assembly for shearing the tubing and sealing the wellhead, and a suspended semi-sealing gate assembly for suspending the tubing and sealing the wellhead. The shearing full-sealing gate assembly is connected to a first driving device, and the suspended semi-sealing gate assembly is connected to a second driving device, which includes a suspended piston driving mechanism and a semi-sealing piston driving mechanism. The suspended semi-sealing gate assembly includes a suspended gate body, within which a semi-sealing pre-seal and a floating slip are installed. The semi-sealing pre-seal is connected to the semi-sealing piston driving mechanism, and the slip is connected to the suspended piston driving mechanism. This design enables the semi-sealing pre-seal and the floating slip to function independently when the suspended gate is closed, achieving tubing suspension and wellhead sealing. More importantly, the sealing is reliable and does not easily damage the coiled tubing.

[0008] Publication No.: CN201318148Y Publication Date: 2009-09-30 This publication discloses a manually operated double-gate blowout preventer (BOP) for use in the petroleum industry. Installed at the wellhead during tubing tripping and open well operations, it seals the annulus or closes the well when blowout signs or occurrences occur, achieved manually. The device comprises a main body, side doors, an upper flange, and a lower flange. The annulus sealing assembly and the open well sealing assembly are stacked within the main body. The upper and lower flanges are installed at the upper and lower ends of the main body, respectively. Both the upper and lower flanges are wellhead flanges for easy connection to the wellhead and installation of other devices. This single sealing device can seal both the annulus and the open well, offering a simple structure, reliable sealing, and strong practicality. The lead screw and bushing are self-locking, preventing the gates from retracting after closing and affecting the sealing effect.

[0009] Publication (Announcement) No.: CN205225161U, Publication (Announcement) Date: 2016-05-11 A combined blowout preventer is provided, including a main body with side doors on both sides. Inside the main body, from top to bottom, there are a semi-sealed gate and a fully sealed gate. Inside the semi-sealed gate, there is a gate shaft in the center, and at the end of the gate shaft, there is a semi-sealed gate rubber core. At the beginning of the gate shaft, there is a bearing, and at the top of the bearing, there is a lead screw. Inside the fully sealed gate, there is a gate shaft in the center, and at the top of the gate shaft, there is a bearing, and at the top of the bearing, there is a lead screw. At the end of the gate shaft, there is a fully sealed gate rubber core. A gate shaft seal is provided between the semi-sealed gate and the fully sealed gate. A sealing steel ring groove is provided below the fully sealed gate. The aforementioned combined blowout preventer, with its double-layer gate design, enables immediate well sealing during downhole workover operations, regardless of the presence of tubing within the well site, in the event of a blowout or the occurrence of a blowout. In case of an accident, turning the handle can promptly rotate the lead screw to prevent a blowout. It features a simple structure, ease of use, and high safety and reliability.

[0010] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding the more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0011] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide a manually operated single-rotor-controlled double-gate blowout preventer (BOP) device and sealing method. This device can be used to prevent blowouts and well kicks during routine drilling and workover operations. While it employs a conventional BOP gate structure design, its structure and method of pushing the gates to seal the tubing string and wellhead differ from conventional BOPs. This device allows a single rotating rod to push two gates, partially and fully sealing the tubing string and wellhead, via a conversion rod.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] A manually operated single-rotation lever controlled double-gate blowout preventer includes a flange housing, a fully sealed gate assembly, a fully sealed gate moving piston, a semi-sealed gate assembly, and a semi-sealed gate moving piston.

[0014] It also includes a linkage control mechanism;

[0015] The linkage control mechanism is installed on the moving piston of the fully enclosed gate plate;

[0016] The semi-sealed gate moving piston has a structure for connecting the linkage control mechanism.

[0017] Furthermore, the linkage control mechanism is a conversion rod, which is installed in the conversion hole opened in the moving piston of the fully sealed gate plate;

[0018] The semi-sealed gate moving piston is provided with a plug hole, which corresponds to the lower end of the conversion rod, and serves as a structure for connecting the linkage control mechanism;

[0019] The inner diameter of the insertion hole is greater than or equal to the outer diameter of the lower end of the conversion rod.

[0020] Furthermore, the conversion rod is a bolt, the conversion hole is a threaded hole, and the bolt is installed in the threaded hole.

[0021] Furthermore, the fully sealed gate moving piston is installed in a radially sealed piston cavity opened in the flange housing;

[0022] The fully enclosed gate assembly is connected to the radial inner end of the fully enclosed gate moving piston, and the linkage control mechanism is located at the radial outer end of the fully enclosed gate moving piston.

[0023] Furthermore, a fully sealed end cap is installed at the outer port of the fully sealed piston cavity. The fully sealed end cap has a through hole for the moving piston of the fully sealed gate to pass through. That is, the fully sealed end cap and the moving piston of the fully sealed gate form a sliding sealing pair.

[0024] Furthermore, the semi-sealed gate moving piston is installed in a radial semi-sealed piston cavity opened in the flange housing;

[0025] The semi-sealed gate assembly is connected to the radial inner end of the semi-sealed gate moving piston, and the radial outer end of the semi-sealed gate moving piston is connected to the radial telescopic control mechanism, which is the rotary rod handle assembly.

[0026] Furthermore, a semi-sealed end cap is installed at the outer port of the semi-sealed piston cavity. The semi-sealed end cap has a through hole for the moving piston of the semi-sealed gate to pass through. That is, the semi-sealed end cap and the moving piston of the semi-sealed gate form a sliding sealing pair.

[0027] Furthermore, the radial telescopic control mechanism includes a lead screw, a support sleeve, and a bearing;

[0028] The lead screw is placed inside the support sleeve, and a bearing is installed between the lead screw and the support sleeve. The radial inner end of the support sleeve is connected to a semi-sealed end cap.

[0029] The radial inner end of the lead screw is fitted into the thread hole opened by the moving piston of the semi-sealed gate.

[0030] To achieve the above objectives, the present invention adopts the following technical solution:

[0031] A sealing method for a manually operated single-rotor-controlled double-gate blowout preventer includes the following steps:

[0032] When it is necessary to close the semi-sealing gate to seal the well, first ensure that the switching rod is rotated upwards to disengage from the moving piston of the fully sealing gate. Then, rotate the rotating rod handle assembly towards the wellhead, which in turn pushes the moving piston of the semi-sealing gate towards the wellhead, further driving the semi-sealing gate assembly towards the wellhead to complete the semi-sealing well sealing. To open, rotate the rotating rod handle assembly in the opposite direction to make it move in the opposite direction, which will drive the moving piston of the semi-sealing gate and thus drive the semi-sealing gate assembly to move in the opposite direction to complete the opening action of the semi-sealing gate.

[0033] Furthermore, it includes the following steps:

[0034] When it is necessary to close the full-sealing gate for well sealing, first rotate the conversion rod downwards and screw it into the insertion hole of the full-sealing gate moving piston. After the two are connected, rotate the rotating rod handle assembly towards the wellhead. At this time, due to the connecting action of the conversion rod, the rotating rod handle assembly can simultaneously push the half-sealing gate moving piston and the full-sealing gate moving piston together towards the wellhead, further driving the half-sealing gate assembly and the full-sealing gate assembly to move towards the wellhead, completing the full-sealing well sealing. When opening, rotate the rotating rod handle assembly in the opposite direction to make it move in the opposite direction, which can drive the half-sealing gate moving piston and the full-sealing gate moving piston, and then drive the half-sealing gate assembly and the full-sealing gate assembly to move in the opposite direction, completing the opening action of the full-sealing gate.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] This device is designed for safe wellhead sealing using gate blowout preventers (BOPs) to prevent blowouts and kicks during conventional oil and water well operations. By using a switching rod, a single rotating rod can simultaneously control the operation of both gates of the BOP. Compared to conventional BOPs, this device has a lower overall height, facilitating wellhead operations, and a lighter weight, reducing worker workload. Therefore, this device significantly improves the efficiency and safety of wellhead operations. Attached Figure Description

[0037] Figure 1This is a schematic diagram of the structure of a manually operated single-rotation rod controlled double-gate anti-spray device according to the present invention.

[0038] In the diagram: 1-Flange housing; 2-Fully sealed gate assembly; 3-Fully sealed gate moving piston; 4-Fully sealed end cap; 5-Semi-sealed gate assembly; 6-Semi-sealed gate moving piston; 7-Semi-sealed end cap; 8-Converting rod; 9-Rotating rod handle assembly. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] Please see Figure 1 The present invention provides a technical solution:

[0042] A manually operated single-rotation rod controlled double-gate blowout preventer includes a flange housing 1, a fully sealed gate assembly 2, a fully sealed gate moving piston 3, a semi-sealed gate assembly 5, and a semi-sealed gate moving piston 6.

[0043] It also includes a linkage control mechanism;

[0044] The linkage control mechanism is installed on the moving piston of the fully enclosed gate plate;

[0045] The semi-sealed gate moving piston has a structure for connecting the linkage control mechanism.

[0046] Furthermore, the linkage control mechanism is a conversion rod 8, which is installed in the conversion hole opened by the moving piston of the fully sealed gate plate;

[0047] The semi-sealed gate moving piston is provided with a plug hole, which corresponds to the lower end of the conversion rod, and serves as a structure for connecting the linkage control mechanism;

[0048] The inner diameter of the insertion hole is greater than or equal to the outer diameter of the lower end of the conversion rod.

[0049] Furthermore, the conversion rod is a bolt, the conversion hole is a threaded hole, and the bolt is installed in the threaded hole.

[0050] Furthermore, the fully sealed gate moving piston is installed in a radially sealed piston cavity opened in the flange housing;

[0051] The fully enclosed gate assembly is connected to the radial inner end of the fully enclosed gate moving piston, and the linkage control mechanism is located at the radial outer end of the fully enclosed gate moving piston.

[0052] Furthermore, a fully sealed end cap 4 is installed at the outer port of the fully sealed piston cavity. The fully sealed end cap has a through hole for the moving piston of the fully sealed gate to pass through. That is, the fully sealed end cap and the moving piston of the fully sealed gate constitute a sliding sealing pair.

[0053] Furthermore, the semi-sealed gate moving piston is installed in a radial semi-sealed piston cavity opened in the flange housing;

[0054] The semi-sealed gate assembly is connected to the radial inner end of the semi-sealed gate moving piston, and the radial outer end of the semi-sealed gate moving piston is connected to the radial telescopic control mechanism, which is the rotary rod handle assembly 9.

[0055] Furthermore, a semi-sealed end cap 7 is installed at the outer port of the semi-sealed piston cavity. The semi-sealed end cap has a through hole for the moving piston of the semi-sealed gate to pass through. That is, the semi-sealed end cap and the moving piston of the semi-sealed gate form a sliding sealing pair.

[0056] Furthermore, the radial telescopic control mechanism includes a lead screw, a support sleeve, and a bearing;

[0057] The lead screw is placed inside the support sleeve, and a bearing is installed between the lead screw and the support sleeve. The radial inner end of the support sleeve is connected to a semi-sealed end cap. The semi-sealed end cap has a radially long slot that allows the linkage control mechanism to run freely in the radial direction.

[0058] The radial inner end of the lead screw is fitted into the thread hole opened by the moving piston of the semi-sealed gate.

[0059] 2-The fully sealed gate assembly is connected to 3-The fully sealed gate moving piston. The movement of 2-The fully sealed gate assembly is controlled by the movement of 3-The fully sealed gate moving piston. 5-The semi-sealed gate assembly is connected to 6-The semi-sealed gate moving piston. The movement of 5-The semi-sealed gate assembly is controlled by the movement of 6-The semi-sealed gate moving piston. 4-The fully sealed end cap and 7-The semi-sealed end cap are used to seal the fully sealed gate moving piston and the semi-sealed gate moving piston of the blowout preventer, respectively. 8-The switching rod is installed at the tail of 3-The fully sealed gate moving piston and can rotate up and down. 9-The rotating rod handle assembly can be manually rotated to move the gate moving piston, thereby opening and closing the gate assembly. 9-The rotating rod handle assembly has a threaded hole, which can be screwed into when 8-The switching rod is rotated downwards.

[0060] When it is necessary to close the semi-sealing gate for well sealing, first ensure that the 8-converter rod is in the upward position, disengaged from the moving piston of the full-sealing gate. Then, rotate the 9-rotating rod handle assembly towards the wellhead, which in turn pushes the 6-semi-sealing gate moving piston towards the wellhead, further driving the 5-semi-sealing gate assembly towards the wellhead, completing the semi-sealing well sealing. To open, rotate the 9-rotating rod handle assembly in the opposite direction, causing it to move in the opposite direction. This will drive the 6-semi-sealing gate moving piston, which in turn drives the 5-semi-sealing gate assembly in the opposite direction, completing the opening action of the semi-sealing gate.

[0061] When the full-sealing gate needs to be closed for well sealing, first rotate the 8-converter rod downwards and screw it into the threaded hole of the full-sealing gate moving piston. After the connection is complete, rotate the 9-rotary rod handle assembly towards the wellhead. At this time, due to the connecting action of the 8-converter rod, the 9-rotary rod handle assembly can simultaneously push the 6-semi-sealing gate moving piston and the 3-full-sealing gate moving piston towards the wellhead, further driving the 5-semi-sealing gate assembly and the 2-full-sealing gate assembly towards the wellhead, completing the full-sealing well sealing. To open, rotate the 9-rotary rod handle assembly in the opposite direction to move it in the opposite direction, which will drive the 6-semi-sealing gate moving piston and the 3-full-sealing gate moving piston, and then drive the 5-semi-sealing gate assembly and the 2-full-sealing gate assembly in the opposite direction, completing the opening action of the full-sealing gate.

[0062] The semi-sealing gate designed in this invention can operate independently, while the full-sealing gate requires the semi-sealing gate to operate simultaneously. During field operations, a tubing string is usually present in the well, requiring the semi-sealing gate to be used for sealing. Full sealing is only necessary when there is no tubing string in the well and operations have ceased, at which point the full-sealing gate is closed. Therefore, the semi-sealing gate is used far more frequently than the full-sealing gate, making this invention fully capable of meeting actual field needs.

[0063] Example 2:

[0064] Please see Figure 1 The present invention provides a technical solution:

[0065] A manually operated single-rotation rod controlled double-gate blowout preventer includes a flange housing 1, a fully sealed gate assembly 2, a fully sealed gate moving piston 3, a semi-sealed gate assembly 5, and a semi-sealed gate moving piston 6.

[0066] It also includes a linkage control mechanism;

[0067] The linkage control mechanism is installed on the moving piston of the fully enclosed gate plate;

[0068] The semi-sealed gate moving piston has a structure for connecting the linkage control mechanism.

[0069] Furthermore, the linkage control mechanism is a conversion rod 8, which is installed in the conversion hole opened by the moving piston of the fully sealed gate plate;

[0070] The semi-sealed gate moving piston is provided with a plug hole, which corresponds to the lower end of the conversion rod, and serves as a structure for connecting the linkage control mechanism;

[0071] The inner diameter of the insertion hole is greater than or equal to the outer diameter of the lower end of the conversion rod.

[0072] Furthermore, the conversion rod is a bolt, the conversion hole is a threaded hole, and the bolt is installed in the threaded hole.

[0073] Furthermore, the fully sealed gate moving piston is installed in a radially sealed piston cavity opened in the flange housing;

[0074] The fully enclosed gate assembly is connected to the radial inner end of the fully enclosed gate moving piston, and the linkage control mechanism is located at the radial outer end of the fully enclosed gate moving piston.

[0075] Furthermore, a fully sealed end cap 4 is installed at the outer port of the fully sealed piston cavity. The fully sealed end cap has a through hole for the moving piston of the fully sealed gate to pass through. That is, the fully sealed end cap and the moving piston of the fully sealed gate constitute a sliding sealing pair.

[0076] Furthermore, the semi-sealed gate moving piston is installed in a radial semi-sealed piston cavity opened in the flange housing;

[0077] The semi-sealed gate assembly is connected to the radial inner end of the semi-sealed gate moving piston, and the radial outer end of the semi-sealed gate moving piston is connected to the radial telescopic control mechanism, which is the rotary rod handle assembly 9.

[0078] Example 3:

[0079] Please see Figure 1 The present invention provides a technical solution:

[0080] A manually operated single-rotation rod controlled double-gate blowout preventer includes a flange housing 1, a fully sealed gate assembly 2, a fully sealed gate moving piston 3, a semi-sealed gate assembly 5, and a semi-sealed gate moving piston 6.

[0081] It also includes a linkage control mechanism;

[0082] The linkage control mechanism is installed on the moving piston of the fully enclosed gate plate;

[0083] The semi-sealed gate moving piston has a structure for connecting the linkage control mechanism.

[0084] Furthermore, the linkage control mechanism is a conversion rod 8, which is installed in the conversion hole opened by the moving piston of the fully sealed gate plate;

[0085] The semi-sealed gate moving piston is provided with a plug hole, which corresponds to the lower end of the conversion rod, and serves as a structure for connecting the linkage control mechanism;

[0086] The inner diameter of the insertion hole is greater than or equal to the outer diameter of the lower end of the conversion rod.

[0087] Although all the above embodiments use Figure 1 However, those skilled in the art will clearly understand that separate drawings are not necessary; simply removing missing components or structural features from the drawings is sufficient. This is clear to those skilled in the art. Of course, embodiments with more components are merely optimal embodiments, while embodiments with fewer components are basic embodiments, but all can achieve the basic objectives of the present invention. Therefore, all these modified embodiments are within the scope of protection of the present invention.

[0088] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field and will not be elaborated upon further. Examples include welding and threaded connections.

[0089] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A manually operated single-rotation lever controlled double-gate blowout preventer, comprising a flange housing, a fully sealed gate assembly, a fully sealed gate moving piston, a semi-sealed gate assembly, and a semi-sealed gate moving piston; characterized in that It also includes a linkage control mechanism; The linkage control mechanism is a conversion rod, which is installed in the conversion hole of the moving piston of the fully sealed gate. The conversion rod is a bolt, the conversion hole is a threaded hole, and the bolt is installed in the threaded hole. The semi-sealed gate moving piston is provided with a plug hole, which corresponds to the lower end of the conversion rod, and serves as a structure for connecting the linkage control mechanism; The inner diameter of the insertion hole is greater than or equal to the outer diameter of the lower end of the conversion rod; By using a switching rod, the operation of both gates of the blowout preventer can be controlled simultaneously with a single rotating rod.

2. A manually operated single rotary lever control double flashboard blowout preventer according to claim 1, wherein, The fully sealed gate moving piston is installed in a radially sealed piston cavity opened in the flange housing; The fully enclosed gate assembly is connected to the radial inner end of the fully enclosed gate moving piston, and the linkage control mechanism is located at the radial outer end of the fully enclosed gate moving piston.

3. A manually operated single rotary lever control double flashboard blowout preventer according to claim 2, wherein, The fully sealed piston cavity is fitted with a fully sealed end cap at its outer port. The fully sealed end cap has a through hole for the fully sealed gate moving piston to pass through. That is, the fully sealed end cap and the fully sealed gate moving piston form a sliding sealing pair.

4. A manually operated single rotary lever control double flashboard blowout preventer according to claim 1 or 3, wherein, The semi-sealed gate moving piston is installed in a radial semi-sealed piston cavity opened in the flange housing; The semi-sealed gate assembly is connected to the radial inner end of the semi-sealed gate moving piston, and the radial outer end of the semi-sealed gate moving piston is connected to the radial telescopic control mechanism, which is the rotary rod handle assembly.

5. A manually operated single rotary lever control double flashboard blowout preventer according to claim 4, wherein, A semi-sealed end cap is installed at the outer port of the semi-sealed piston cavity. The semi-sealed end cap has a through hole for the moving piston of the semi-sealed gate to pass through. That is, the semi-sealed end cap and the moving piston of the semi-sealed gate form a sliding sealing pair.

6. A manually operated single rotary lever control double flashboard blowout preventer according to claim 5, wherein, The radial telescopic control mechanism includes a lead screw, a support sleeve, and a bearing; The lead screw is placed inside the support sleeve, and a bearing is installed between the lead screw and the support sleeve. The radial inner end of the support sleeve is connected to a semi-sealed end cap. The radial inner end of the lead screw is fitted into the thread hole opened by the moving piston of the semi-sealed gate.

7. A method of sealing a double ram blowout preventer controlled by a manual single rotary lever as defined in claim 1, wherein, Includes the following steps: When it is necessary to close the semi-sealing gate for well sealing, first ensure that the switching rod is rotated upwards and disengaged from the semi-sealing gate moving piston. Then, rotate the rotating rod handle assembly towards the wellhead, which in turn pushes the semi-sealing gate moving piston towards the wellhead, further driving the semi-sealing gate assembly towards the wellhead to complete the semi-sealing well sealing. To open, rotate the rotating rod handle assembly in the opposite direction to make it move in the opposite direction, which will drive the semi-sealing gate moving piston and thus drive the semi-sealing gate assembly to move in the opposite direction to complete the opening action of the semi-sealing gate. When it is necessary to close the full-sealing gate for well sealing, first rotate the conversion rod downwards and screw it into the insertion hole of the semi-sealing gate moving piston. After the two are connected, rotate the rotating rod handle assembly towards the wellhead. At this time, due to the connecting action of the conversion rod, the rotating rod handle assembly can simultaneously push the semi-sealing gate moving piston and the full-sealing gate moving piston together towards the wellhead, further driving the semi-sealing gate assembly and the full-sealing gate assembly to move towards the wellhead, completing the full-sealing well sealing. When opening, rotate the rotating rod handle assembly in the opposite direction to make it move in the opposite direction, which can drive the semi-sealing gate moving piston and the full-sealing gate moving piston, and then drive the semi-sealing gate assembly and the full-sealing gate assembly to move in the opposite direction, completing the opening action of the full-sealing gate.

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