CN118564194A - A large outer diameter casing joint connection structure - Google Patents

Abstract

The invention discloses a large-outer-diameter sleeve joint connecting structure which comprises a connecting mechanism, wherein the connecting mechanism is used for installing two large-outer-diameter sleeves and comprises a main connecting pipe; the plug-in component is sleeved at the mounting end of the large-outer-diameter sleeve; a screw member located outside the insert; the extrusion clamping ring is clamped on the surface of the plug-in unit and is in threaded connection with the inside of the threaded piece. The invention aims to solve the technical problems that the existing large-outer-diameter sleeve joint connecting structure is inconvenient to install the large-outer-diameter sleeve rapidly in the using process, the installation efficiency of the large-outer-diameter sleeve is reduced, the large-outer-diameter sleeve is easy to loosen under the influence of external factors after the installation is completed, and the stability of the large-outer-diameter sleeve in the long-term using process is reduced.

Description

A large outer diameter casing joint connection structure

Technical Field

The invention relates to the technical field of well mining, in particular to a casing joint connection structure.

Background Art

Large outer diameter casing is the surface casing used in oil and gas drilling and production. It generally has an outer diameter of 508mm and above. Its main function is to support the well wall of the oil well or gas well to prevent the well wall from collapsing. There are multiple large outer diameter casings, which need to be installed together through threaded joints. The large outer diameter casing joint connection structure refers to a special component used to connect large outer diameter casing in oil and gas wells. It ensures the sealing and mechanical connection between single pipes, so that multiple pipes can be assembled into a continuous pipe string extending to a depth of thousands of meters underground. This connection is essential to maintain the stability and sealing of the wellbore, prevent well fluid leakage and external water and soil intrusion, and avoid groundwater pollution and safety hazards. A well-sealed connection can prevent external water or high-pressure formation fluid from invading the oil pipe, which helps to maintain the pressure balance inside and outside the oil pipe.

A threaded joint for oil casing for high-pressure gas wells with Chinese patent application number 202310074772.9 relates to the technical field of threaded joints for oil casing, including oil casing and threaded joints. An internal thread is provided on the inner wall of the threaded joint near the left pipe opening, and an internal thread is symmetrically provided on the inner wall of the threaded joint near the right pipe opening; the oil casing is symmetrically arranged on the left and right sides of the threaded joint, and an external thread matching the left internal thread of the oil casing is provided on the annular outer side of the left oil casing near the right pipe opening. The threaded joint for oil casing for high-pressure gas wells is provided by arranging a connecting pipe at the center position inside the threaded joint, arranging sealing rings at the left and right ends of the annular outer side of the connecting pipe, and providing sealing grooves matching the sealing rings at corresponding positions on the inner wall of the oil casing. When the two oil casings are screwed into the threaded joint, the sealing rings enter the sealing grooves respectively, thereby improving the sealing between the oil casing and the connecting pipe.

The existing casing joint connection structure suitable for outer diameters of 139.7mm-508mm is not suitable for casings with outer diameters exceeding 508mm, because the larger the outer diameter, the more difficult it is to fasten, and it is more likely to cause wrong fastening, which greatly reduces the screwing efficiency. Moreover, after the large outer diameter casing is screwed, it is easy to be loosened by external factors, which reduces the stability of the large outer diameter casing during long-term use.

Summary of the invention

The technical problem to be solved by the present invention is that the existing large outer diameter sleeve joint connection structure is not convenient for quick installation of the large outer diameter sleeve during use, which reduces the installation efficiency of the large outer diameter sleeve, and the large outer diameter sleeve is easily loosened due to external factors after installation, which reduces the stability of the large outer diameter sleeve during long-term use.

In order to solve the above technical problems, the present invention provides the following technical solutions: a large outer diameter casing joint connection structure, comprising:

A connecting mechanism, the connecting mechanism is used to install two large outer diameter casings, the connecting mechanism includes a main connecting pipe;

A plug-in, which is sleeved on the mounting end of the large outer diameter casing;

A threaded member, the threaded member being located outside the plug-in unit;

An extrusion clamp ring, which is clamped on the surface of the plug-in and is connected to the internal thread of the threaded member;

A sealing mechanism, which is installed inside the connecting mechanism and installed on one side of the extrusion clamp ring to seal the large outer diameter casing;

A locking mechanism is installed on the inner wall of the connecting mechanism and sleeved on the surface of the large outer diameter sleeve to lock it. The locking mechanism is communicated with the sealing mechanism.

As a preferred solution of the large outer diameter sleeve joint connection structure of the present invention, wherein: both left and right ends of the main pipe are provided with fitting joints, and the fitting joints are sleeved on the surface of the large outer diameter sleeve.

As a preferred solution of the large outer diameter sleeve joint connection structure described in the present invention, the plug-in includes a plug ring sleeved on the mounting end of the large outer diameter sleeve, and the inner wall of the plug ring is equipped with a plurality of semicircular sockets connected to the large outer diameter sleeve, and a receiving groove is opened inside the semicircular socket.

As a preferred solution of the large outer diameter casing joint connection structure of the present invention, wherein: the threaded member includes an internal thread seat, and a connecting ring is provided on the surface of the internal thread seat.

As a preferred solution of the large outer diameter sleeve joint connection structure of the present invention, the extrusion clamp ring includes a ring body, a plurality of clamping parts are installed on the ring body, and a semicircular head is movably connected inside the clamping part.

As a preferred solution of the large outer diameter sleeve joint connection structure described in the present invention, wherein: an external threaded tube is installed at one end of the ring body, an extruded arc ring is installed at the other end of the ring body, a movable hole for accommodating a semicircular head is opened on the surface of the ring body, a hollow support frame is fixedly connected to the bottom of the inner wall of the semicircular head, an inclined elastic metal piece is installed on the top of the hollow support frame, and a multi-section bent elastic metal piece connected to the inner wall of the clamp is installed on the top of the inclined elastic metal piece.

As a preferred solution of the large outer diameter sleeve joint connection structure described in the present invention, wherein: the sealing mechanism includes a cylindrical air bag, the surface of the cylindrical air bag is provided with a mounting ring fixedly connected to the inner wall of the main connecting pipe, a movable seat is installed on one side of the cylindrical air bag, and a limiting sliding part movably connected to the inner wall of the main connecting pipe is installed on the surface of the movable seat, and a sealing rubber sleeve is installed on one side of the movable seat, and the surface of the sealing rubber sleeve is respectively provided with a wave sealing protrusion and an arc sealing part, the wave sealing protrusion is located on the inner wall of the large outer diameter sleeve to seal it, and the arc sealing part is located at the installation end of the large outer diameter sleeve to seal it.

As a preferred solution of the large outer diameter sleeve joint connection structure described in the present invention, wherein: a plurality of vent holes are opened on the opposite side of the cylindrical airbag and the movable seat, and the plurality of vent holes connect the cylindrical airbag and the sealing rubber sleeve, and an arc groove is opened on one side of the movable seat.

As a preferred solution of the large outer diameter sleeve joint connection structure described in the present invention, wherein: the locking mechanism includes a hollow ring, conveying racks are installed on the upper and lower sides of the hollow ring, a conveying cavity is opened inside the conveying rack, a rubber ring is connected to the inner wall of the hollow ring, a plurality of sliding locks are arranged on the inner wall of the rubber ring, the sliding lock is movably connected to the inner wall of the hollow ring, a locking head is arranged on the inner side of the sliding lock, and the clamping end of the locking head penetrates into the inner wall of the hollow ring.

As a preferred solution of the large outer diameter casing joint connection structure of the present invention, a plurality of limiting arc plates are installed on the inner wall of the hollow ring, and the surface of the limiting arc plates is connected to the inner wall of the rubber ring.

Beneficial effects of the present invention:

1. The present invention assists the installer to improve the installation efficiency through quick plug-in, and can prevent loosening after quick plug-in, thereby improving the installation stability. When installing the plug-in, the plug-in ring is sleeved on the surface of the large outer diameter sleeve joint, and the semicircular socket is clamped in the installation groove to achieve the connection between the large outer diameter sleeve and the plug-in. After the installation of the plug-in is completed, the large outer diameter sleeve and the plug-in are extended into the connecting mechanism, the connecting mechanism is sleeved on the surface of the large outer diameter sleeve, and the plug-in is clamped in the extrusion clamp ring. When the plug-in and the extrusion clamp ring are clamped, the semicircular socket first squeezes the semicircular head The semicircular head is pressed to retract into the clamping part. During the retraction process, the semicircular head squeezes the inclined elastic metal part and the multi-section bent elastic metal part through the hollow support frame. The inclined elastic metal part and the multi-section bent elastic metal part are deformed and retracted after being subjected to pressure. When the accommodating groove moves to the bottom of the semicircular head, the pressure on the semicircular head disappears, and the multi-section bent elastic metal part and the inclined elastic metal part are deformed and reset downward to drive the semicircular head to be stuck in the accommodating groove. After the semicircular head is stuck in the accommodating groove, the connection between the large outer diameter sleeve, the plug-in and the extrusion clamp is realized.

2. The present invention enhances the physical connection between the large outer diameter sleeve and the connecting mechanism through the coordinated use of the plug-in and the extrusion clamp, and also increases the stability of the connection through the deformation and reset mechanism of the multi-section bent elastic metal parts and the inclined elastic metal parts, thereby reducing the risk of loose connection due to vibration or pressure changes. The threaded connection between the threaded part and the extrusion clamp allows a series of components to be driven to rotate by rotating the large outer diameter sleeve, thereby realizing a relatively simple on-site installation and disassembly process, which is conducive to improving work efficiency and reducing installation time and cost.

3. The present invention effectively seals the connection of the large outer diameter casing and fixes the large outer diameter casing while sealing, thereby preventing the large outer diameter casing from rotating inside the threaded structure, further increasing the stability of the operation of the large outer diameter casing. In addition, the threaded structure is hidden inside, which can prevent the threaded part from being corroded and improve the service life.

4. The present invention not only realizes dynamic sealing by utilizing air pressure in the sealing mechanism, but also can automatically adjust the sealing strength under different pressure conditions, adapt to different working environments and pressure changes, and extend the service life of the seal. By utilizing air pressure to achieve dynamic sealing, this design can better adapt to large fluctuations in temperature and pressure, and is particularly suitable for applications in oil and gas fields with complex geological conditions, large temperature differences, and unstable pressures, ensuring the reliability of the seal and the adaptability of the equipment.

5. The present invention provides an additional locking function for the large outer diameter casing body through the coordinated use of the sliding lock head and the locking head, further stabilizes the overall structure, prevents displacement during high pressure or long-term operation, and ensures the long-term reliability of the connection. During the process of the sealing mechanism sealing the large outer diameter casing, the air inside it will also enter the inner cavity of the hollow ring through the conveying cavity, and the high-pressure air applies pressure to the rubber ring, causing the rubber ring to shrink and deform inwardly. During the process of the rubber ring shrinking inwardly, the limiting arc plate supports part of the rubber ring to prevent it from shrinking inwardly, so that the position where the sliding lock head and the rubber ring are connected is compressed, and the sliding lock head is then driven to press against the surface of the large outer diameter casing body to lock and fix the large outer diameter casing body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front axonometric view of the present invention;

FIG2 is a first front cross-sectional isometric view of the present invention;

FIG3 is a second front cross-sectional isometric view of the present invention;

FIG4 is a front cross-sectional isometric view of the connection mechanism of the present invention;

FIG5 is a front axonometric view of a large outer diameter sleeve and an insert of the present invention;

FIG6 is a front axonometric view of a large outer diameter casing according to the present invention;

FIG. 7 is a main axonometric view of the plug-in of the present invention;

FIG8 is a front axonometric view of a threaded member of the present invention;

FIG9 is a front axonometric view of an extrusion clamp of the present invention;

FIG10 is a front axonometric view of the ring body of the present invention;

FIG11 is a front cross-sectional isometric view of a clamp and a semicircular head of the present invention;

FIG12 is a front isometric view of the sealing mechanism of the present invention;

FIG13 is a front cross-sectional isometric view of the sealing mechanism of the present invention;

FIG14 is a schematic left sectional view of the sealing mechanism of the present invention;

FIG15 is a front isometric view of the locking mechanism of the present invention;

FIG16 is a front cross-sectional isometric view of the locking mechanism of the present invention;

FIG. 17 is a left-side sectional isometric view of the locking mechanism of the present invention.

In the figure: 100, connecting mechanism; 101, main pipe; 102, fitting joint; 200, large outer diameter casing; 201, large outer diameter casing body; 202, large outer diameter casing joint; 203, mounting groove; 300, plug-in; 301, plug ring; 302, semicircular socket; 303, receiving groove; 400, threaded member; 401, internal thread seat; 402, connecting ring; 500, extrusion clamp ring; 501, ring body; 502, clamp; 503, semicircular head; 504, external threaded pipe; 505, movable hole; 506, extrusion arc ring; 507, hollow Empty support frame; 508, inclined elastic metal part; 509, multi-section bending elastic metal part; 600, sealing mechanism; 601, cylindrical airbag; 602, mounting ring; 603, movable seat; 604, wave sealing protrusion; 605, limiting sliding part; 606, arc groove; 607, arc sealing part; 608, sealing rubber sleeve; 609, vent; 700, locking mechanism; 701, hollow ring; 702, conveying frame; 703, locking head; 704, conveying cavity; 705, rubber ring; 706, sliding lock head; 707, limiting arc plate.

DETAILED DESCRIPTION

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

Embodiment 1, as shown in FIG. 1-14 , this embodiment provides a large outer diameter casing joint connection structure, including a connection mechanism 100 , the connection mechanism 100 is used to install two large outer diameter casings 200 , and the connection mechanism 100 includes a main pipe 101 .

Furthermore, both left and right ends of the main pipe 101 are provided with fitting joints 102 , and the fitting joints 102 are sleeved on the surface of the large outer diameter sleeve 200 .

Furthermore, the large outer diameter sleeve 200 includes a large outer diameter sleeve body 201, one end of which is provided with a large outer diameter sleeve joint 202, an insert ring 301 is sleeved on the surface of the large outer diameter sleeve body 201, and the surface of the large outer diameter sleeve joint 202 is provided with an installation groove 203 for accommodating the semicircular socket 302.

Furthermore, it also includes a plug-in 300 , which is sleeved on the installation end of the large outer diameter sleeve 200 .

Furthermore, the plug-in 300 includes an insert ring 301 sleeved on the mounting end of the large outer diameter sleeve 200 , and a plurality of semicircular sockets 302 connected to the large outer diameter sleeve 200 are installed on the inner wall of the insert ring 301 , and a receiving groove 303 is opened inside the semicircular socket 302 .

Furthermore, it also includes a threaded member 400 , which is located outside the plug-in 300 .

Furthermore, the threaded member 400 includes an internal thread seat 401 , and a connecting ring 402 is provided on the surface of the internal thread seat 401 .

Furthermore, the internal thread seat 401 is threadedly sleeved on the surface of the external thread pipe 504 .

Furthermore, the connecting ring 402 is installed on the surface of the hollow ring 701 .

Furthermore, it also includes an extrusion clamp ring 500 , which is clamped on the surface of the plug-in 300 and is threadably connected to the inner part of the threaded member 400 .

The extrusion clamp ring 500 comprises a ring body 501 , on which a plurality of clamping members 502 are mounted, and a semicircular head 503 is movably connected inside the clamping member 502 .

Furthermore, an external threaded tube 504 is installed at one end of the ring body 501, and an extruded arc ring 506 is installed at the other end of the ring body 501. A movable hole 505 is opened on the surface of the ring body 501 to accommodate the semicircular head 503. A hollow support frame 507 is fixedly connected to the bottom of the inner wall of the semicircular head 503. An inclined elastic metal piece 508 is installed on the top of the hollow support frame 507. A multi-section bent elastic metal piece 509 connected to the inner wall of the clamp 502 is installed on the top of the inclined elastic metal piece 508.

Furthermore, the semicircular head 503 is snap-fitted into the receiving groove 303 to limit the semicircular socket 302 , the insert ring 301 and the large outer diameter sleeve 200 .

Furthermore, it also includes a sealing mechanism 600 , which is installed inside the connecting mechanism 100 and installed on one side of the extrusion clamp ring 500 to seal the large outer diameter sleeve 200 .

Furthermore, the sealing mechanism 600 includes a cylindrical airbag 601, a mounting ring 602 fixedly connected to the inner wall of the main connecting pipe 101 is sleeved on the surface of the cylindrical airbag 601, a movable seat 603 is installed on one side of the cylindrical airbag 601, a limiting sliding member 605 movably connected to the inner wall of the main connecting pipe 101 is installed on the surface of the movable seat 603, a sealing rubber sleeve 608 is installed on one side of the movable seat 603, and a wave sealing protrusion 604 and an arc-shaped sealing portion 607 are respectively provided on the surface of the sealing rubber sleeve 608, the wave sealing protrusion 604 is located on the inner wall of the large outer diameter sleeve 200 to seal it, and the arc-shaped sealing portion 607 is located at the mounting end of the large outer diameter sleeve 200 to seal it.

Furthermore, a plurality of vent holes 609 are provided on opposite sides of the cylindrical airbag 601 and the movable seat 603 , and the plurality of vent holes 609 connect the cylindrical airbag 601 and the sealing rubber sleeve 608 . An arc groove 606 is provided on one side of the movable seat 603 .

Furthermore, the extrusion arc ring 506 is located in the inner cavity of the arc groove 606 and is movably connected to the inner wall thereof.

Before installing the large outer diameter sleeve 200 , a mounting groove 203 is opened in advance on the large outer diameter sleeve joint 202 to install the plug-in 300 .

When installing the plug-in 300 , the plug-in ring 301 is sleeved on the surface of the large outer diameter sleeve joint 202 , and the semicircular socket 302 is clamped in the installation groove 203 , so as to realize the connection between the large outer diameter sleeve 200 and the plug-in 300 .

After the installation of the plug-in 300 is completed, the large outer diameter sleeve 200 and the plug-in 300 are extended out of the connecting mechanism 100. The connecting mechanism 100 is sleeved on the surface of the large outer diameter sleeve 200. The plug-in 300 is clamped in the extrusion clamp ring 500. When the plug-in 300 and the extrusion clamp ring 500 are clamped, the semicircular socket 302 first squeezes the semicircular head 503 to make the semicircular head 503 retract into the clamping member 502. During the retraction process, the semicircular head 503 squeezes the inclined elastic metal piece 508 and the multi-segment bent elastic metal piece 509 through the hollow support frame 507. The inclined elastic metal piece 508 and the multi-segment bent elastic metal piece 509 are deformed and retracted after being subjected to pressure. When the accommodating groove 303 moves to the bottom of the semicircular head 503, the pressure on the semicircular head 503 disappears, and the multi-segment bent elastic metal piece 509 and the inclined elastic metal piece 508 are deformed and reset downward to drive the semicircular head 503 to be clamped in the interior of the accommodating groove 303.

After the semicircular head 503 is stuck in the inside of the accommodating groove 303, the connection between the large outer diameter sleeve 200, the plug-in 300 and the extrusion clamp 500 is realized. The staff rotates the large outer diameter sleeve 200 through the tool, and the large outer diameter sleeve 200 drives the extrusion clamp 500 to rotate through the plug-in 300. The extrusion clamp 500 rotates on the inner wall of the threaded part 400 and is squeezed toward the sealing mechanism 600, so that the extrusion clamp 500 can seal the large outer diameter sleeve 200.

Through quick plug-in, it can assist installers to improve installation efficiency, and after quick plug-in, it can prevent loosening and improve installation stability.

The physical connection between the large outer diameter sleeve 200 and the connecting mechanism 100 is enhanced by the use of the plug-in 300 and the extrusion clamp 500. The deformation and reset mechanism of the multi-section bent elastic metal part 509 and the inclined elastic metal part 508 increases the stability of the connection and reduces the risk of loose connection due to vibration or pressure changes.

The threaded connection between the threaded member 400 and the extrusion clamp 500 allows a series of components to be rotated by rotating the large outer diameter sleeve 200, thereby achieving a relatively simple on-site installation and disassembly process, which is beneficial to improving work efficiency and reducing installation time and cost.

When the extrusion clamp 500 rotates inside the threaded part 400, the large outer diameter sleeve joint 202 drives the semicircular socket 302 to rotate through the installation groove 203, the semicircular socket 302 drives the semicircular head 503 to rotate through the accommodating groove 303, the semicircular head 503 drives the ring body 501 to rotate through the clamp 502, and the ring body 501 drives the external threaded tube 504 to rotate on the inner wall of the internal threaded seat 401, thereby realizing the lateral movement of the extrusion clamp 500.

When the extrusion clamp ring 500 extrudes the sealing mechanism 600, the extrusion arc ring 506 rotates on the inner wall of the arc groove 606 and drives the moving seat 603 to move in the direction of the cylindrical airbag 601. During the movement of the moving seat 603, the limiting sliding member 605 is driven to slide on the inner wall of the main pipe 101, thereby limiting the moving seat 603 to prevent it from shaking. After the cylindrical airbag 601 is squeezed, the air inside it enters the sealing rubber sleeve 601 through the vent hole 609. 08, so that the wave sealing protrusion 604 and the arc-shaped sealing part 607 on the surface of the sealing rubber sleeve 608 expand outward, the wave sealing protrusion 604 presses against the inner wall of the large outer diameter sleeve joint 202, and the arc-shaped sealing part 607 presses against one end of the large outer diameter sleeve joint 202, to achieve the sealing of the installation position of the large outer diameter sleeve 200, prevent the liquid from leaking through the connection between the large outer diameter sleeve 200 and the connecting mechanism 100, and pressurize and fix the large outer diameter sleeve joint 202.

The connection of the large outer diameter sleeve 200 is efficiently sealed. While sealing, the large outer diameter sleeve 200 can be fixed to prevent the large outer diameter sleeve 200 from rotating inside the threaded structure, further increasing the stability of the operation of the large outer diameter sleeve 200. In addition, the threaded structure is hidden inside, which can prevent the threaded part from being corroded and increase the service life.

The multi-stage sealing arrangement ensures the sealing effect at the connection of the large outer diameter casing 200, effectively preventing oil and gas leakage and external water and soil intrusion, thereby improving the sealing and safety of the wellbore.

The use of air pressure in the sealing mechanism 600 not only realizes dynamic sealing, but also can automatically adjust the sealing force under different pressure conditions, adapt to different working environments and pressure changes, and extend the service life of the seal. By utilizing air pressure to achieve dynamic sealing, this design can better adapt to large fluctuations in temperature and pressure, and is particularly suitable for applications in oil and gas fields with complex geological conditions, large temperature differences, and unstable pressures, ensuring the reliability of the seal and the adaptability of the equipment.

Compared with traditional mechanical seals, the air-driven sealing mechanism may provide a simpler maintenance method. When the sealing rubber sleeve 608 needs to be replaced, the operation is relatively direct and does not require a complicated disassembly process, thereby reducing maintenance costs and time.

The use of the wave sealing protrusion 604 and the arc-shaped sealing portion 607 is used in combination to reduce the wear caused by direct metal contact, especially inside the large outer diameter sleeve joint 202. Such a non-metallic sealing interface helps to extend the service life of the entire connection system and reduce the risk of leakage caused by wear.

Embodiment 2, as shown in Figures 14-17, is the second embodiment of the present invention. This embodiment is based on the previous embodiment, and differs from the previous embodiment in that it also includes a locking mechanism 700. The locking mechanism 700 is installed on the inner wall of the connecting mechanism 100 and is sleeved on the surface of the large outer diameter sleeve 200 to lock it. The locking mechanism 700 is connected to the sealing mechanism 600.

Furthermore, the locking mechanism 700 includes a hollow ring 701, and a conveying rack 702 is installed on the upper and lower sides of the hollow ring 701. A conveying cavity 704 is opened inside the conveying rack 702. The inner wall of the hollow ring 701 is connected to a rubber ring 705. The inner wall of the rubber ring 705 is provided with a plurality of sliding locks 706. The sliding locks 706 are movably connected to the inner wall of the hollow ring 701. A locking head 703 is provided on the inner side of the sliding lock 706, and the clamping end of the locking head 703 penetrates through the inner wall of the hollow ring 701.

Furthermore, a plurality of limiting arc plates 707 are installed on the inner wall of the hollow ring 701 , and the surfaces of the limiting arc plates 707 are connected to the inner wall of the rubber ring 705 .

Furthermore, the hollow ring 701 is sleeved on the surface of the large outer diameter casing body 201, and the locking head 703 contacts the surface of the large outer diameter casing body 201 to apply pressure thereto.

Furthermore, the air inlet end of the conveying frame 702 penetrates into the inner cavity of the cylindrical airbag 601 , and the conveying cavity 704 opened inside the conveying frame 702 is communicated with the inner cavity of the cylindrical airbag 601 and the inner cavity of the hollow ring 701 respectively.

Furthermore, there are several limiting arc plates 707, which are located at the interval between the sliding lock heads 706 to limit the rubber ring 705 at the interval between the two sliding lock heads 706 to prevent it from being deformed by pressure, so that the rubber ring 705 at the connection with the sliding lock head 706 can be deformed to achieve the purpose of applying pressure only to the sliding lock head 706. After the sliding lock head 706 is subjected to pressure, it drives the locking head 703 to extend inward, and the locking head 703 is pressed against the surface of the large outer diameter sleeve body 201 to lock the large outer diameter sleeve 200 to prevent it from loosening.

When the sealing mechanism 600 is sealing the large outer diameter sleeve 200, the air inside it will also enter the inner cavity of the hollow ring 701 through the conveying cavity 704, and the high-pressure air will exert pressure on the rubber ring 705, causing the rubber ring 705 to shrink and deform inward. During the shrinkage of the rubber ring 705, the limiting arc plate 707 supports part of the rubber ring 705 to prevent it from shrinking, so that the position where the sliding lock head 706 and the rubber ring 705 are connected is compressed, and the sliding lock head 706 is then driven to press the locking head 703 against the surface of the large outer diameter sleeve body 201, thereby locking and fixing the large outer diameter sleeve body 201.

The use of the sliding lock head 706 and the locking head 703 provides an additional locking function for the large outer diameter casing body 201, further stabilizing the overall structure, preventing displacement during high pressure or long-term operation, and ensuring the long-term reliability of the connection.

In a working environment that is subjected to high pressure and vibration for a long time, this locking mechanism can effectively reduce the stress concentration of the large outer diameter casing 200, reduce material fatigue by evenly distributing the force, and extend the service life of the large outer diameter casing 200.

Through mechanical locking and limiting, even under extreme working conditions, such as sudden high pressure fluctuations or accidents, the large outer diameter casing 200 can be effectively prevented from escaping from the connecting mechanism 100, thereby reducing well control risks and improving operation safety.

Claims (10)

1. A large external diameter sleeve joint connection structure, its characterized in that: comprising the steps of (a) a step of,

-A connection mechanism (100), the connection mechanism (100) being for mounting two large outer diameter bushings (200), the connection mechanism (100) comprising a main connection pipe (101);

The plug-in component (300), the said plug-in component (300) is set up in the installation end of the large external diameter sleeve (200);

A screw (400), the screw (400) being located outside the insert (300);

The extrusion clamping ring (500), wherein the extrusion clamping ring (500) is clamped on the surface of the plug-in unit (300) and is in threaded connection with the inside of the threaded piece (400);

the sealing mechanism (600) is arranged in the connecting mechanism (100) and is arranged at one side of the extrusion clamping ring (500) to seal the large-outer-diameter sleeve (200);

and the locking mechanism (700) is arranged on the inner wall of the connecting mechanism (100) and sleeved on the surface of the large-outer-diameter sleeve (200) to lock the large-outer-diameter sleeve, and the locking mechanism (700) is communicated with the sealing mechanism (600).

2. The large outer diameter casing joint connection structure according to claim 1, wherein: the left end and the right end of the main connecting pipe (101) are respectively provided with a joint (102), and the joint joints (102) are sleeved on the surface of the large-outer-diameter sleeve (200).

3. The large outer diameter casing joint connection structure according to claim 1, wherein: the plug-in unit (300) comprises a plug-in ring (301) sleeved at the installation end of the large-outer-diameter sleeve (200), a plurality of semicircular sockets (302) connected with the large-outer-diameter sleeve (200) are installed on the inner wall of the plug-in ring (301), and accommodating grooves (303) are formed in the semicircular sockets (302).

4. The large outer diameter casing joint connection structure according to claim 1, wherein: the threaded piece (400) comprises an inner threaded seat (401), and a connecting ring (402) is arranged on the surface of the inner threaded seat (401).

5. The large outer diameter casing joint connection structure according to claim 1, wherein: the extrusion snap ring (500) comprises a ring body (501), a plurality of clamping pieces (502) are installed on the ring body (501), and semicircular heads (503) are movably connected inside the clamping pieces (502).

6. The large outer diameter casing joint connection structure according to claim 5, wherein: external screw thread pipe (504) are installed to ring body (501) one end, extrusion arc ring (506) are installed to ring body (501) other end, movable hole (505) that semicircle head (503) held are seted up on ring body (501) surface, semicircle head (503) inner wall bottom fixedly connected with fretwork support frame (507), slope elastic metal piece (508) are installed at fretwork support frame (507) top, multistage elastic metal piece (509) of bending that is connected with fastener (502) inner wall are installed at slope elastic metal piece (508) top.

7. The large outer diameter casing joint connection structure according to claim 1, wherein: sealing mechanism (600) are including cylindricality gasbag (601), cylindricality gasbag (601) surface cover is equipped with collar (602) with main takeover (101) inner wall fixed connection, remove seat (603) are installed to cylindricality gasbag (601) one side, remove seat (603) surface mounting have with main takeover (101) inner wall swing joint's spacing slider (605), remove seat (603) one side and install sealing rubber cover (608), sealing rubber cover (608) surface is provided with wave seal protruding (604) and arc sealing portion (607) respectively, wave seal protruding (604) are located big external diameter sleeve pipe (200) inner wall and seal it, arc sealing portion (607) are located big external diameter sleeve pipe (200) installation end and seal it.

8. The large outer diameter casing joint connection structure according to claim 7, wherein: a plurality of vent holes (609) are formed in one side, opposite to the moving seat (603), of the cylindrical air bag (601), the cylindrical air bag (601) is communicated with the sealing rubber sleeve (608) through the vent holes (609), and an arc-shaped groove (606) is formed in one side of the moving seat (603).

9. The large outer diameter casing joint connection structure according to claim 1, wherein: locking mechanism (700) are including cavity ring (701), carriage (702) are all installed to both sides about cavity ring (701), transport chamber (704) have been seted up to carriage (702) inside, cavity ring (701) inner wall is connected with rubber ring (705), rubber ring (705) inner wall is provided with a plurality of slip tapered end (706), slip tapered end (706) and cavity ring (701) inner wall swing joint, slip tapered end (706) inboard is equipped with locking head (703), locking head (703) holding end runs through to cavity ring (701) inner wall.

10. The large outer diameter casing joint connection structure according to claim 9, wherein: the inner wall of the hollow ring (701) is provided with a plurality of limiting arc plates (707), and the surfaces of the limiting arc plates (707) are connected with the inner wall of the rubber ring (705).