Intelligent self-locking casing head device and pressure control system

Abstract

The application provides a kind of intelligent self-locking casing head device and pressure control system, it is related to casing head technical field, intelligent self-locking casing head device includes casing head main part, center hole is arranged in casing head main part center, hanger is arranged in center hole, annular sealing groove is arranged on the upper surface of casing head main part, metal ring pad is arranged in annular sealing groove, flange connecting piece is arranged on the top of casing head main part, sealing pressure sleeve is arranged on the outer wall of flange connecting piece, sealing pressure sleeve lower end extends into annular sealing groove and contacts with the upper surface of metal ring pad.In the application, through the close contact of sealing pressure sleeve and metal ring pad, metal ring pad can be stably kept in annular sealing groove, and sealing structure is formed between sealing pressure sleeve and metal ring pad, which significantly improves the sealing performance between casing head main part and flange connecting piece, and reduces the risk of leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casing head, in particular to an intelligent self-locking casing head device and pressure control system. BACKGROUND

[0002] The casing head is the core component of the wellhead device, mainly bearing the weight of the suspended casing, sealing the annular pressure, connecting the wellhead equipment and providing an emergency treatment channel and the like. Specifically, it includes supporting various layers of casing columns, isolating the pressure between casings, providing an installation base for blowout preventers and Christmas trees, and realizing special operations such as cement or well killing fluid injection through side ports.

[0003] The Chinese patent with the authorized publication number CN117418805B discloses an intelligent self-locking casing head device and pressure control system, which comprises a casing head body, a mounting cavity penetrating an inner middle position, a hydraulic oil cavity being formed on the side of the inside of the casing head body close to the mounting cavity, a connecting flange being arranged on the top of the casing head body, a hanger being arranged in the mounting cavity, the casing head body providing clamping force for the hanger through the oil pressure of the hydraulic oil cavity, and a control structure being arranged on the outer side of the casing head body, which is used for sealing the hydraulic oil cavity when the hanger is installed; the greater the extrusion force of the self-locking latch tongue on the hanger is, the more firm the hanger is, the firmness of the hanger is directly related to the pressure at one end of the inside of the casing head body, so that the hanger can be provided with insurance, the stability of the hanger can still be ensured when the one end of the inside of the casing head body is suddenly impacted by a larger pressure, and the hanger has the effect of explosion prevention, thereby improving the safety of the casing head body.

[0004] However, the casing head body and the connecting flange of the casing head device lack a sealing structure, which leads to a decline in the sealing performance between the casing head body and the connecting flange, and greatly increases the risk of leakage. SUMMARY

[0005] The present application provides an intelligent self-locking casing head device and pressure control system to solve the technical problem that the casing head body and the connecting flange lack a sealing structure, which leads to a decline in the sealing performance between the casing head body and the connecting flange, and greatly increases the risk of leakage.

[0006] To solve the above technical problems, the present application discloses an intelligent self-locking casing head device, which comprises a casing head body, a center hole being arranged in the center of the casing head body, a hanger being arranged in the center hole, an annular sealing groove being arranged on the upper surface of the casing head body, a metal ring pad being arranged in the annular sealing groove, a flange connecting piece being arranged on the top of the casing head body, a sealing pressure sleeve being arranged on the outer wall of the flange connecting piece, and the lower end of the sealing pressure sleeve extending into the annular sealing groove and being in contact with the upper surface of the metal ring pad.

[0007] Preferably, a support mechanism is arranged in the annular sealing groove, the support mechanism comprising a support ring, a side wall of the support ring being in sealing sliding connection with an inner wall of the annular sealing groove, and a bottom wall of the support ring being provided with a plurality of elastic supporting members.

[0008] Preferably, an annular hole is arranged in the sealing pressure sleeve, a lower end of the annular hole penetrating through a bottom wall of the sealing pressure sleeve, a sliding sleeve being arranged in the annular hole, a side wall of the sliding sleeve being in up-down sliding connection with an inner wall of the annular hole, and an upper end of the sliding sleeve being connected with a top wall of the annular hole through a plurality of first springs.

[0009] Preferably, the sliding sleeve is sequentially provided with a main body section, a transition section and a sealing section from top to bottom, an outer diameter of the sealing section being smaller than an outer diameter of the main body section, one end of the transition section being connected with the main body section, the other end of the transition section being connected with the sealing section, and the outer diameter of the transition section gradually decreasing from top to bottom.

[0010] Preferably, an outer diameter of the upper end of the transition section is equal to an outer diameter of the lower end of the main body section, and an outer diameter of the lower end of the transition section is equal to an outer diameter of the upper end of the sealing section.

[0011] Preferably, a retaining ring is arranged near the upper end of the annular sealing groove, an outer wall of the retaining ring being connected with a side wall of the annular sealing groove, and an inner wall of the retaining ring being in up-down sliding connection with an outer wall of the sealing pressure sleeve, a plurality of transverse holes being arranged in the side wall of the sealing pressure sleeve, a contact plate being slidably arranged in the transverse holes, one end of the contact plate near the sliding sleeve being semicircular, the other end of the contact plate extending to outside of the transverse holes, a guide groove being arranged in an inner wall of the transverse hole, a moving block being slidably arranged in the guide groove, the moving block being connected with the inner wall of the guide groove through a second spring, and one end of the moving block extending to outside of the guide groove and being connected with the contact plate.

[0012] Preferably, a plurality of sliding holes are arranged in the side wall of the sealing pressure sleeve, a pull plate being slidably arranged in the sliding holes, one end of the pull plate being connected with an outer wall of the sliding sleeve, and the other end of the pull plate extending to outside of the sealing pressure sleeve.

[0013] Preferably, a rotating shaft is arranged at the end of the pull plate away from the sliding sleeve, one end of the rotating shaft being rotatably connected with a side wall of the pull plate, the other end of the rotating shaft being provided with a swing plate, a torsional spring being sleeved on the rotating shaft, one end of the torsional spring being connected with the swing plate, the other end of the torsional spring being connected with the pull plate, and a clamping plate being arranged at an upper end of the swing plate, one end of the clamping plate away from the swing plate being clamped into a clamping groove arranged on an outer wall of the sealing pressure sleeve.

[0014] Preferably, the clamping plate is made of an elastic plate.

[0015] The application further discloses a pressure control system for the intelligent self-locking casing head device, comprising a controller, a fluid pressure sensor and a pressure relief valve, the fluid pressure sensor being arranged in the central hole for monitoring fluid pressure in the central hole, the pressure relief valve being arranged outside the casing head body and being in communication with the central hole at one end, the controller being arranged outside the casing head body, and the fluid pressure sensor and the pressure relief valve being electrically connected with the controller respectively.

[0016] The technical solution of this invention has the following advantages: This invention provides an intelligent self-locking sleeve head device and pressure control system, relating to the field of sleeve head technology. The intelligent self-locking sleeve head device includes a sleeve head body, a central hole at the center of the sleeve head body, a hanger inside the central hole, an annular sealing groove on the upper surface of the sleeve head body, a metal ring gasket inside the annular sealing groove, a flange connector at the top of the sleeve head body, a sealing sleeve on the outer wall of the flange connector, and the lower end of the sealing sleeve extending into the annular sealing groove and contacting the upper surface of the metal ring gasket. In this invention, through the tight contact between the sealing sleeve and the metal ring gasket, the metal ring gasket can be stably held within the annular sealing groove, and a sealing structure is formed between the sealing sleeve and the metal ring gasket, significantly improving the sealing performance between the sleeve head body and the flange connector and reducing the risk of leakage.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of an intelligent self-locking sleeve head device according to the present invention;

[0021] Figure 2 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0022] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point B in the middle;

[0023] Figure 4 For the present invention Figure 1 Enlarged view of the structure at point C;

[0024] Figure 5 This is a partial structural diagram of the drive rod and sliding block in this invention;

[0025] Figure 6 This is a schematic diagram of the assembly of the flange connector and the sleeve head body in this invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged view of the structure at point D;

[0027] Figure 8 For the application Figure 6 Enlarged view of the structure at E in the application

[0028] Figure 9 For the application

[0029] In the figure: 1, casing head body; 2, center hole; 3, hanger; 4, annular sealing groove; 5, metal ring pad; 6, flange connector; 7, sealing sleeve; 8, support ring; 9, elastic support; 10, annular hole; 11, sliding sleeve; 12, first spring; 13, stop ring; 14, transverse hole; 15, contact plate; 16, guide groove; 17, moving block; 18, second spring; 19, sliding hole; 20, pull plate; 21, rotating shaft; 22, swing plate; 23, clamping plate; 24, mounting cavity; 25, plugging plate; 26, sliding block; 27, sliding groove; 28, rotating ring; 29, arc-shaped hole; 30, sliding column; 31, spring rod; 32, sliding block; 33, fixed block; 34, drive rod; 35, sealing hole; 36, third spring; 37, arc-shaped rod; 38, limiting groove; 39, push plate. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present application will be described herein below with reference to the accompanying drawings, in which it is understood that the described preferred embodiments are merely for the purpose of illustrating and explaining the present application, and are not intended to limit the present application.

[0031] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and does not mean to particularly indicate the order or sequence, nor to limit the present application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0032] Example 1:

[0033] The embodiment of the present application provides an intelligent self-locking casing head device, such as Figure 1 , Figure 2As shown, it includes: a sleeve head body 1, a central hole 2 at the center of the sleeve head body 1, a hanger 3 inside the central hole 2, an annular sealing groove 4 on the upper surface of the sleeve head body 1, a metal ring gasket 5 inside the annular sealing groove 4, a flange connector 6 at the top of the sleeve head body 1, a sealing sleeve 7 on the outer wall of the flange connector 6, and the lower end of the sealing sleeve 7 extending into the annular sealing groove 4 and contacting the upper surface of the metal ring gasket 5.

[0034] The working principle and beneficial effects of the above technical solution are as follows: A central hole 2 is provided inside the main body 1 of the sleeve head. The central hole 2 has a countersunk hole structure. The upper outer wall of the hanger 3 is adapted to the inner wall of the central hole 2, so that the hanger 3 can be installed in the central hole 2. During assembly, the hanger 3 is first inserted into the central hole 2. After the hanger 3 is installed, a metal ring gasket 5 is placed in the annular sealing groove 4. Then, the flange connector 6 is installed. The upper end of the hanger 3 is inserted into the central hole of the flange connector 6, and the flange connector 6 is installed downward along the hanger 3. A sealing sleeve 7 is installed on the wall. The sealing sleeve 7 can be connected to the flange connector 6 by welding without changing the internal structure of the flange connector 6, thus reducing costs and improving applicability. As the flange connector 6 is installed downwards, the lower end of the sealing sleeve 7 enters the annular sealing groove 4 and contacts the upper surface of the metal ring gasket 5. The flange connector 6 is pushed downwards until the lower surface of the flange connector 6 contacts the upper surface of the sleeve head body 1. Then, the flange connector 6 can be connected to the sleeve head body 1 with bolts, thereby completing the installation of the flange connector 6. In this invention, the tight contact between the sealing sleeve 7 and the metal ring gasket 5 ensures that the metal ring gasket 5 is stably held within the annular sealing groove 4, and a sealing structure is formed between the sealing sleeve 7 and the metal ring gasket 5, significantly improving the sealing performance between the sleeve head body 1 and the flange connector 6 and reducing the risk of leakage.

[0035] Example 2:

[0036] Based on the above embodiment 1, as follows Figure 2 As shown, a support mechanism is provided inside the annular sealing groove 4. The support mechanism includes a support ring 8. The side wall of the support ring 8 is slidably connected to the inner wall of the annular sealing groove 4. Several elastic support members 9 are provided on the bottom wall of the support ring 8.

[0037] The working principle and beneficial effects of the above technical solution are as follows: after the metal ring pad 5 is put into the annular sealing groove 4, the flange connecting piece 6 is installed, the sealing pressure sleeve 7 slides along the annular sealing groove 4 downwards, the sealing pressure sleeve 7 contacts the metal ring pad 5 and drives the metal ring pad 5 to slide downwards along the annular sealing groove 4, the metal ring pad 5 contacts the supporting ring 8 and drives the supporting ring 8 to slide downwards along the annular sealing groove 4, and the elastic supporting piece 9 is compressed. The elastic supporting piece 9 can be a spring, and a plurality of elastic supporting pieces 9 are arranged at equal intervals, thereby providing stable support for the metal ring pad 5. Under the elastic force of the elastic supporting piece 9, the metal ring pad 5 is in close contact with the sealing pressure sleeve 7, thereby improving the sealing performance of the sealing pressure sleeve 7.

[0038] Embodiment 3

[0039] On the basis of embodiment 2, as shown in Figure 2 The annular hole 10 is arranged in the sealing pressure sleeve 7, the lower end of the annular hole 10 penetrates the bottom wall of the sealing pressure sleeve 7, the sliding sleeve 11 is arranged in the annular hole 10, the side wall of the sliding sleeve 11 is connected to the inner wall of the annular hole 10 in a sliding manner, and the upper end of the sliding sleeve 11 is connected to the top wall of the annular hole 10 through the first springs 12.

[0040] The sliding sleeve 11 is sequentially provided with a main body section, a transition section and a sealing section from top to bottom, the outer diameter of the sealing section is smaller than that of the main body section, one end of the transition section is connected to the main body section, the other end of the transition section is connected to the sealing section, and the outer diameter of the transition section gradually decreases from top to bottom.

[0041] The outer diameter of the upper end of the transition section is equal to that of the lower end of the main body section, and the outer diameter of the lower end of the transition section is equal to that of the upper end of the sealing section.

[0042] The working principle and beneficial effects of the above technical solution are as follows: the sliding sleeve 11 is arranged in the annular hole 10 of the sealing pressure sleeve 7, when the flange connecting piece 6 is not installed, the lower end of the sliding sleeve 11 is located outside the annular hole 10 under the elastic force of the first springs 12; when the flange connecting piece 6 is installed, the inner wall of the sealing pressure sleeve 7 slides along the inner wall of the annular sealing groove 4 downwards, the sliding sleeve 11 first contacts the upper surface of the metal ring pad 5, the sliding sleeve 11 gradually slides upwards along the annular hole 10 under the action of the supporting ring 8, the first springs 12 are gradually compressed, the metal ring pad 5 is stably kept in the annular sealing groove 4 through the extrusion of the sliding sleeve 11 and the supporting ring 8, the sliding sleeve 11 has a ring structure, the lower surface of the sliding sleeve 11 is in close contact with the upper surface of the metal ring pad 5 under the elastic force of the first springs 12, the fluid leaking from between the casing head main body 1 and the flange connecting piece 6 reaches the sealing pressure sleeve 7 and is blocked by the first layer, then flows into the annular sealing groove 4 and is blocked by the second layer of the sliding sleeve 11, the sealing performance between the casing head main body 1 and the flange connecting piece 6 is further improved through the formation of multiple layers of blocking, and the risk of leakage is reduced.

[0043] Embodiment 4

[0044] On the basis of Embodiment 3, as shown in Figures 1-3 The annular sealing groove 4 is provided with a stop ring 13 near the upper end position, the outer wall of the stop ring 13 is connected with the side wall of the annular sealing groove 4, the inner wall of the stop ring 13 is slidingly connected with the outer wall of the sealing pressure sleeve 7, a plurality of horizontal holes 14 are arranged on the side wall of the sealing pressure sleeve 7, a contact plate 15 is slidingly arranged in the horizontal hole 14, one end of the contact plate 15 near the sliding sleeve 11 is semicircular, the other end of the contact plate 15 extends to the outside of the horizontal hole 14, a guide groove 16 is arranged on the inner wall of the horizontal hole 14, a moving block 17 is slidingly arranged in the guide groove 16, the moving block 17 is connected with the inner wall of the guide groove 16 through a second spring 18, one end of the moving block 17 extends to the outside of the guide groove 16 and is connected with the contact plate 15;

[0045] A plurality of sliding holes 19 are arranged on the side wall of the sealing pressure sleeve 7, a pull plate 20 is slidingly arranged in the sliding hole 19, one end of the pull plate 20 is connected with the outer wall of the sliding sleeve 11, the other end of the pull plate 20 extends to the outside of the sealing pressure sleeve 7.

[0046] The working principle and beneficial effects of the above technical scheme are as follows: the stop ring 13 is arranged on the inner wall of the annular sealing groove 4, when the flange connecting piece 6 is installed, the inner ring of the stop ring 13 is in contact with the outer wall of the sealing pressure sleeve 7, when installing, the sliding sleeve 11 is first pulled upward by the pull plate 20, so that the sealing section of the sliding sleeve 11 reaches the position of the contact plate 15, due to the small diameter of the sealing section, under the elastic force of the second spring 18, the moving block 17 slides in the guide groove 16 to the direction close to the sliding sleeve 11, and drives the contact plate 15 to slide in the horizontal hole 14, so that the outer end of the contact plate 15 enters the horizontal hole 14, at this time, the sealing pressure sleeve 7 can be inserted into the annular sealing groove 4, when the height of the contact plate 15 is lower than the height of the stop ring 13, the pull plate 20 is loosened, under the elastic force of the first spring 12, the sliding sleeve 11 slides downward, and the contact plate 15 is extruded outward by the transition section, so that the outer end of the contact plate 15 slides to the outside of the horizontal hole 14 again, the upper surface of the contact plate 15 is in contact with the lower surface of the stop ring 13, at this time, the flange connecting piece 6 is connected with the stop ring 13 through the contact plate 15 in the sealing pressure sleeve 7, and the connection with the sleeve head main body 1 is realized; when disassembling, the pull plate 20 is first pulled upward, so that the sealing section of the sliding sleeve 11 reaches the position of the contact plate 15, under the elastic force of the second spring 18, the contact plate 15 slides into the horizontal hole 14, and the contact plate 15 is separated from the stop ring 13, at this time, the flange connecting piece 6 can be pulled upward, so that the sealing pressure sleeve 7 is pulled out of the annular sealing groove 4, and the separation of the flange connecting piece 6 and the sleeve head main body 1 is realized. In the above scheme, the connection of the contact plate 15 and the stop ring 13 can replace the traditional bolt connection mode, the flange connecting piece 6 can be disassembled and assembled only by pulling the pull plate 20, which can not only significantly improve the disassembly or installation efficiency of the flange connecting piece 6, but also realize labor-saving disassembly and assembly, and reduce the labor intensity of workers;

[0047] Additionally, an electric push rod is installed on the inner wall of the top of the annular hole 10, a second controller and an indicator are installed on the outside of the flange connector 6, a first contact pressure sensor is installed at the bottom of the sealing sleeve 7 to monitor the pressure of the sealing sleeve 7 on the metal ring gasket 5, and a second contact pressure sensor is installed at the bottom of the sliding sleeve 11 to monitor the pressure of the sliding sleeve 11 on the metal ring gasket 5. The electric push rod, the first contact pressure sensor, the second contact pressure sensor, and the indicator are electrically connected to the second controller. During installation, the operator first pulls the pull plate 20 upwards so that the contact plate 15 enters the transverse hole 14, and then pushes the sealing sleeve 7 downwards. The sealing sleeve 7 first contacts the surface of the metal ring gasket 5. When the pressure of the sealing sleeve 7 on the metal ring gasket 5 is greater than the first preset pressure, it indicates that the height of the contact plate 15 is lower than the height of the retaining ring 13. At this time, the indicator sounds a warning, and the operator releases the pull plate 20 according to the warning. Under the elastic force of the first spring 12, the sliding sleeve 11 slides downwards along the inner wall of the annular hole 10, and one end of the contact plate 15 extends out of the transverse hole 14 and contacts the retaining ring 13. This completes the installation of flange connector 6. Then, the bottom of the sliding sleeve 11 contacts the upper surface of the metal ring gasket 5, improving the sealing performance. Next, the second controller controls the electric push rod to push downwards. The electric push rod contacts the sliding sleeve 11 and pushes downwards, increasing the pressure of the sliding sleeve 11 on the metal ring gasket 5. Simultaneously, it enhances the contact pressure between the contact plate 15 and the retaining ring 13, improving the reliability of the connection between the contact plate 15 and the retaining ring 13, making flange connector 6 more stable. When the pressure monitored by the second contact pressure sensor exceeds the second preset pressure, the second controller... The controller determines that the sleeve head body 1 has been locked with the flange connector 6. At this time, the electric push rod stops moving, so that the pressure of the sliding sleeve 11 on the metal ring gasket 5 is greater than the second preset pressure, completing the intelligent self-locking process, enhancing the tightness of the connection between the sliding sleeve 11 and the metal ring gasket 5, and further improving the sealing performance. When removing the flange connector 6, first control the electric push rod to retract, then manually pull the pull plate 20 upward, so that the contact plate 15 slides into the transverse hole 14, and pull the flange connector 6 upward, so that the flange connector 6 can be quickly removed from the sleeve head body 1.

[0048] Example 5:

[0049] Based on Example 4, such as Figure 2 As shown, a rotating shaft 21 is provided at the end of the pull plate 20 away from the sliding sleeve 11. One end of the rotating shaft 21 is rotatably connected to the side wall of the pull plate 20. A swing plate 22 is provided at the other end of the rotating shaft 21. A torsion spring is sleeved on the rotating shaft 21. One end of the torsion spring is connected to the swing plate 22, and the other end of the torsion spring is connected to the pull plate 20. A retaining plate 23 is provided at the upper end of the swing plate 22. The end of the retaining plate 23 away from the swing plate 22 is inserted into a retaining groove. The retaining groove is provided on the outer wall of the sealing sleeve 7.

[0050] The card plate 23 is made of a flexible plate.

[0051] The working principle and beneficial effects of the above technical solution are as follows: After the flange connector 6 is installed onto the sleeve head body 1, the swing plate 22 is rotated so that the end of the swing plate 22 away from the pull plate 20 rotates towards the sealing sleeve 7. Then, the clamping plate 23 is inserted into the clamping groove, and the upper surface of the clamping plate 23 contacts the top wall of the clamping groove. There is a gap between the bottom of the clamping plate 23 and the clamping groove. When the metal ring gasket 5 is first installed, the upper surface of the clamping plate 23 can contact the top wall of the clamping groove because the metal ring gasket 5 is intact. As the usage time increases, the thickness of the metal ring gasket 5 gradually decreases under the compression of the support ring 8 and the sliding sleeve 11. Under the elastic force of the first spring 12 and the second spring 18, the support ring 8 and the sliding sleeve 11 can still contact the metal ring gasket 5. The contact of the ring gasket 5 ensures sealing performance. When the thickness of the metal ring gasket 5 decreases to the preset value, the sliding sleeve 11 moves downward and drives the pull plate 20 to slide downward. The pull plate 20 drives the swing plate 22 to move downward. The swing plate 22 drives the clamping plate 23 to slide downward in the clamping groove. The upper end of the clamping plate 23 separates from the top wall of the clamping groove. Under the action of the torsion spring, the upper end of the swing plate 22 swings away from the sealing sleeve 7, so that the clamping plate 23 separates from the clamping groove. Based on the separated clamping plate 23, the operator can remove the flange connector 6 to inspect the metal ring gasket 5. Finally, replace the metal ring gasket 5 with one that is thinner than the preset value to improve the reliability of the metal ring gasket 5, enhance the sealing performance, and reduce the risk of leakage.

[0052] Example 6:

[0053] Based on any one of Examples 2-5, such as Figures 1-9 As shown, the main body 1 of the sleeve head is provided with an installation cavity 24. The side of the installation cavity 24 near the central hole 2 is connected to the central hole 2 through two connecting holes. The two connecting holes are symmetrically arranged. A sealing plate 25 is provided in the connecting hole. The sealing plate 25 is slidably connected to the connecting hole in a sealing manner. The sealing plate 25 is semi-circular and its diameter is larger than the diameter of the central hole 2. One end of the sealing plate 25 extends into the installation cavity 24 and is provided with a slider 26. The upper end of the slider 26 is slidably connected to the inner wall of the slide groove 27. The slide groove 27 is located on the top wall of the installation cavity 24. A rotating ring 28 is provided below the sealing plate 25. The inner ring of the rotating ring 28 is rotatably connected to the inner wall of the installation cavity 24. Two sets of driving mechanisms are provided in the installation cavity 24. The two sets of driving mechanisms are centrally symmetrically distributed about the central axis of the central hole 2. The driving mechanisms are used to drive the slider 26 to slide left and right in the slide groove 27.

[0054] The driving mechanism comprises an arc-shaped hole 29, a sliding column 30, a spring rod 31, a sliding block 32, a fixed block 33 and a driving rod 34, the arc-shaped hole 29 is obliquely arranged in the rotating ring 28, one end of the arc-shaped hole 29 is close to the central hole 2, the other end of the arc-shaped hole 29 is away from the central hole 2, the sliding column 30 is slidably arranged in the arc-shaped hole 29, the spring rod 31 is arranged at the upper end of the sliding column 30, one end of the spring rod 31 is connected with the sliding block 26, the sliding block 32 is arranged on the outer wall of the rotating ring 28, the driving rod 34 is arranged above the sliding block 32, the driving rod 34 is slidably arranged in a sealing hole 35, the sealing hole 35 is vertically arranged in the sleeve head main body 1, one end of the sealing hole 35 is communicated with the mounting cavity 24, the other end of the sealing hole 35 is communicated with the annular sealing groove 4, the upper end of the driving rod 34 is connected with the bottom wall of the supporting ring 8, the lower end of the driving rod 34 is provided with a first inclined surface, the end of the sliding block 32 close to the driving rod 34 is provided with a second inclined surface matched with the first inclined surface, the fixed block 33 is arranged on the inner wall of the mounting cavity 24, the fixed block 33 and the sliding block 32 are connected through a third spring 36, an arc-shaped groove is arranged in the fixed block 33, an arc-shaped rod 37 is slidably arranged in the arc-shaped groove, one end of the arc-shaped rod 37 passes through the third spring 36 and is connected with the sliding block 32.

[0055] The working principle and beneficial effects of the above technical scheme are as follows: the outer wall of the hanger 3 is provided with two limiting grooves 38, the lower end of the limiting groove 38 is provided with a chamfer, the lower end of the hanger 3 is provided with a push plate 39, the push plate 39 is in the shape of an isosceles triangle, the two blocking plates 25 are provided with a third inclined surface at one end close to each other, and the third inclined surface is matched with the side wall of the push plate 39; when the hanger 3 is not installed, under the action of the third spring 36, the sliding column 30 is located at one end of the arc-shaped hole 29 away from the center hole 2, the spring rod 31 is in an extended state, and the sliding block 26 pushes the blocking plate 25 into the center hole 2, the two blocking plates 25 are in contact at the end, thereby blocking the center hole 2, and preventing external impurities from entering the inside of the center hole 2; when the hanger 3 is installed, the push plate 39 of the hanger 3 is placed downward, when the push plate 39 contacts the blocking plate 25, the blocking plate 25 can be pushed to both sides, so that the blocking plate 25 slides inward in the communication hole, the spring rod 31 is compressed for the first time, then the blocking plate 25 slides along the outer wall of the hanger 3, and the blocking plate 25 enters the limiting groove 38 on the outer wall of the hanger 3 under the elastic force of the spring rod 31, so as to clamp and fix the middle position of the hanger 3, thereby improving the stability of the hanger 3, then when the flange connecting piece 6 is installed, the sliding sleeve 11 presses the metal ring pad 5 downward, the metal ring pad 5 drives the supporting ring 8 to slide downward, the supporting ring 8 drives the driving rod 34 to slide downward in the sealing hole 35, the first inclined surface at the lower end of the driving rod 34 contacts the second inclined surface of the sliding block 32, then slides along the second inclined surface through the first inclined surface, and simultaneously drives the sliding block 32 to slide toward the fixed block 33, the arc-shaped rod 37 slides in the arc-shaped groove, the third spring 36 is compressed, the sliding block 32 drives the rotating ring 28 to rotate in the installation cavity 24 when sliding, the rotating ring 28 drives the arc-shaped hole 29 to move, the sliding column 30 in the arc-shaped hole 29 slides toward the center hole 2 along the arc-shaped hole 29, the sliding column 30 drives the spring rod 31 to move, the spring rod 31 drives the sliding block 26 to slide linearly in the sliding groove 27, so that the spring rod 31 is compressed for the second time, and the compression of the spring rod 31 further improves the extrusion force of the blocking plate 25 on the hanger 3, thereby enhancing the stability of the hanger 3.

[0056] Example 7:

[0057] On the basis of any one of examples 1-6, further comprising a pressure control system for the above-mentioned intelligent self-locking casing head device, comprising: a controller, a fluid pressure sensor and a pressure relief valve, the fluid pressure sensor is arranged in the center hole 2, used for monitoring the fluid pressure in the center hole 2, the pressure relief valve is arranged outside the casing head body 1, one end of the pressure relief valve is communicated with the center hole 2, the controller is arranged outside the casing head body 1, and the fluid pressure sensor and the pressure relief valve are electrically connected with the controller respectively.

[0058] The working principle and beneficial effects of the technical scheme are as follows: the fluid pressure sensor is arranged in the center hole 2, the fluid pressure sensor can monitor the fluid pressure in the center hole 2, when the fluid pressure in the center hole 2 monitored by the fluid pressure sensor is greater than the preset pressure, the controller can control the pressure relief valve to open, and part of the fluid is discharged through the pressure relief valve, so as to release the pressure in the casing head body 1, when the fluid pressure in the center hole 2 monitored by the fluid pressure sensor reaches the preset pressure range, the controller controls the pressure relief valve to close, so as to realize the pressure control in the casing head body 1, and the controller is in communication connection with the second controller, when the fluid pressure in the center hole 2 monitored by the fluid pressure sensor is greater than the preset pressure, the second controller can control the electric push rod to push downward by a preset length, increase the pressure of the sliding sleeve 11 on the metal ring pad 5, and enhance the sealing performance of the sliding sleeve 11.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] Although the embodiments of the present application have been disclosed as above, it is not limited to the application and implementation listed in the specification and embodiments, and it can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A smart self-locking casing head device, characterized in that, The utility model relates to a casing head, which comprises a casing head body (1) provided with a central hole (2) in the center, a hanger (3) arranged in the central hole (2), an annular sealing groove (4) arranged on the upper surface of the casing head body (1), a metal ring pad (5) arranged in the annular sealing groove (4), a flange connecting piece (6) arranged on the top of the casing head body (1), and a sealing pressing sleeve (7) arranged on the outer wall of the flange connecting piece (6) and extending into the annular sealing groove (4) and being in contact with the upper surface of the metal ring pad (5). The annular sealing groove (4) is provided with a supporting mechanism, which comprises a supporting ring (8) that is in sealing sliding connection with the inner wall of the annular sealing groove (4), and the bottom wall of the supporting ring (8) is provided with a plurality of elastic supporting pieces (9). The sealing pressing sleeve (7) is provided with an annular hole (10) therein, the lower end of the annular hole (10) penetrates through the bottom wall of the sealing pressing sleeve (7), a sliding sleeve (11) is arranged in the annular hole (10), the side wall of the sliding sleeve (11) is in up-down sliding connection with the inner wall of the annular hole (10), and the upper end of the sliding sleeve (11) is connected with the top wall of the annular hole (10) through a plurality of first springs (12). The sliding sleeve (11) is sequentially provided with a main body section, a transition section and a sealing section from top to bottom, the outer diameter of the sealing section is smaller than that of the main body section, one end of the transition section is connected with the main body section, the other end of the transition section is connected with the sealing section, and the outer diameter of the transition section gradually decreases from top to bottom. The outer diameter of the upper end of the transition section is equal to that of the lower end of the main body section, and the outer diameter of the lower end of the transition section is equal to that of the upper end of the sealing section. The annular sealing groove (4) is provided with a stop ring (13) near the upper end, the outer wall of the stop ring (13) is connected with the side wall of the annular sealing groove (4), the inner wall of the stop ring (13) is in up-down sliding connection with the outer wall of the sealing pressing sleeve (7), the side wall of the sealing pressing sleeve (7) is provided with a plurality of transverse holes (14), a contact plate (15) is slidably arranged in the transverse hole (14), one end of the contact plate (15) is semicircular and close to the sliding sleeve (11), the other end of the contact plate (15) extends to the outside of the transverse hole (14), a guide groove (16) is arranged in the inner wall of the transverse hole (14), a moving block (17) is slidably arranged in the guide groove (16), the moving block (17) is connected with the inner wall of the guide groove (16) through a second spring (18), and one end of the moving block (17) extends to the outside of the guide groove (16) and is connected with the contact plate (15). The side wall of the sealing pressing sleeve (7) is provided with a plurality of sliding holes (19), a pull plate (20) is slidably arranged in the sliding hole (19), one end of the pull plate (20) is connected with the outer wall of the sliding sleeve (11), and the other end of the pull plate (20) extends to the outside of the sealing pressing sleeve (7). One end of the pull plate (20) away from the sliding sleeve (11) is provided with a rotating shaft (21), the other end of the rotating shaft (21) is provided with a swing plate (22), a torsional spring is sleeved on the rotating shaft (21), one end of the torsional spring is connected with the swing plate (22), the other end of the torsional spring is connected with the pull plate (20), the upper end of the swing plate (22) is provided with a clamping plate (23), and the end of the clamping plate (23) away from the swing plate (22) is clamped into a clamping groove arranged on the outer wall of the sealing pressing sleeve (7).

2. A smart self-locking casing head device according to claim 1, characterized in that, The clamping plate (23) is made of an elastic plate.

3. A smart self-closing casing head apparatus according to claim 2, wherein, The utility model relates to a casing head, which comprises a casing head body (1) provided with a central hole (2) in the center, a hanger (3) arranged in the central hole (2), an annular sealing groove (4) arranged on the upper surface of the casing head body (1), a metal ring pad (5) arranged in the annular sealing groove (4), a flange connecting piece (6) arranged on the top of the casing head body (1), and a sealing pressing sleeve (7) arranged on the outer wall of the flange connecting piece (6) and extending into the annular sealing groove (4) and being in contact with the upper surface of the metal ring pad (5).

4. A pressure control system for use with the intelligent self-locked casing head apparatus of any one of claims 1-3, characterized in that, ​ The controller, the fluid pressure sensor and the pressure relief valve, the fluid pressure sensor is arranged in the central hole (2) and is used for monitoring the fluid pressure in the central hole (2), the pressure relief valve is arranged outside the casing head body (1), one end of the pressure relief valve is communicated with the central hole (2), and the controller is arranged outside the casing head body (1), and the fluid pressure sensor and the pressure relief valve are electrically connected with the controller respectively.

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