Casing head device based on a pressure control system

Abstract

The present invention discloses a casing head device based on a pressure control system, which relates to the technical field of oil well facilities and includes a housing. A technical casing is installed on the lower side of the housing; a suspension and fixation mechanism is used to install a production casing inside the housing, and the lower end of the production casing penetrates through the technical casing; a sealing mechanism is located below the suspension and fixation mechanism and is arranged between the production casing and the inner wall of the housing. Among them, the suspension and fixation mechanism includes two metal flexible belts and two tensioning and fixing components, and both of the two metal flexible belts include an arc-shaped portion covering the outer circumferential surface of the technical casing and a straightening portion connected to both ends of the arc-shaped portion. The present invention can tighten the two metal flexible belts through the two tensioning and fixing components, and fix the production casing through the arc-shaped portions of the two metal flexible belts. This installation method is more convenient to operate, has high efficiency, shortens the construction period, and reduces the labor intensity of installers.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well facilities, and particularly to a casing head device based on a pressure control system. Background Art

[0002] A casing head is a key component in oil drilling and completion operations. It is mainly used to fix the wellhead of a drilled well, connect the wellhead casing string, support the gravity of the technical casing and the production casing, and seal the annular space between each layer of pipes. It provides a transition connection for installing a blowout preventer, a tubing head, and a Christmas tree, and through two side ports on the casing head body, construction operations such as squeezing mud, monitoring, and injecting balancing fluid can be carried out.

[0003] Existing technical casings are generally fixed in the casing head through a casing hanger, and the hanger can be a slip type or a mandrel type. The slip type casing hanger suspends the casing through the clamping force of the slips, while the mandrel type casing hanger realizes suspension through the cooperation of the mandrel and the casing. When installing the above two methods of fixing the technical casing, both are relatively cumbersome, and installation personnel need to consume a large amount of effort to install and fix the technical casing to the casing head, including the sealing between the technical casing and the casing head. Summary of the Invention

[0004] The purpose of the present invention is to provide a casing head device based on a pressure control system, which solves the problem that the existing methods of installing technical casings are relatively cumbersome and installation personnel need to consume a large amount of effort to install and fix the technical casing to the casing head.

[0005] The present invention solves the above technical problems through the following technical solutions. The present invention includes:

[0006] A housing, and the technical casing is installed on the lower side of the housing;

[0007] A suspension and fixation mechanism, which is used to install the production casing inside the housing, and the lower end of the production casing penetrates through the technical casing; and

[0008] A sealing mechanism, which is located below the suspension and fixation mechanism and is arranged between the production casing and the inner wall of the housing;

[0009] Wherein, the suspension and fixation mechanism includes two metal flexible belts and two tensioning and fixing components. Both of the two metal flexible belts include an arc portion covering the outer circumferential surface of the technical casing and a straightening portion connected to both ends of the arc portion. The two tensioning and fixing components are symmetrically installed inside the housing. One straightening portion of each of the two metal flexible belts is connected to one of the tensioning and fixing components, and the other straightening portion of each of the two metal flexible belts is connected to the other tensioning and fixing component. The two tensioning and fixing components respectively pull and tighten both ends of the metal flexible belt to realize the fixation of the production casing.

[0010] Preferably, the tensioning and fixing assembly includes outer vertical plates commonly fixed to the ends of the straightening portions of two metal flexible belts. The outer vertical plates are horizontally slidably mounted inside the housing. A plurality of hydraulic telescopic rods are mounted inside the outer vertical plates. The plurality of hydraulic telescopic rods are connected to a first electronic valve through a pipeline, and a first pressure sensor for monitoring the hydraulic pressure inside the hydraulic telescopic rods is mounted on the hydraulic telescopic rods. The first electronic valve is connected to an external hydraulic station. The telescopic ends of the hydraulic telescopic rods are fixed with inner frame blocks. Two symmetrically arranged abutting assemblies are mounted inside the inner frame blocks. A first spring is mounted on the outer side of the outer vertical plates.

[0011] Preferably, the abutting assembly includes mounting blocks mounted on the inner frame blocks. Two vertically arranged sliders are horizontally slidably mounted on the mounting blocks. A long-shaped wheel is rotatably mounted between the two sliders. The mounting blocks and the sliders are commonly fixed with connecting blocks. A tightening block is rotatably mounted between the two mounting blocks through a rotating shaft. A half gear is fixed to the rotating shaft. A rack meshingly connected to the half gear is fixed to the slider.

[0012] Preferably, the mounting block is detachably connected to the inner frame block through a coupling assembly. The coupling assembly includes a convex groove formed in the vertical portion of the inner frame block and a convex strip fixed to the mounting block, and the convex strip is inserted and fixed in the convex groove.

[0013] Preferably, a mounting groove is communicated and opened on the inner wall of the housing. A spring groove is opened on the outer side of the mounting groove. One end of the first spring is mounted in the spring groove. A convex block for restricting the outer vertical plate is fixed to the inner end side wall of the mounting groove; a guide rod is fixed to the side wall of the mounting groove, and the outer vertical plate is slidably mounted on the guide rod.

[0014] Preferably, the casing head device further includes two groups of support mechanisms. The two groups of support mechanisms are symmetrically arranged on the housing respectively. The support mechanism includes multiple groups of sliding rods slidably mounted on the housing. The inner ends of each group of sliding rods are all fixed with an arc-shaped support housing. An outer support block corresponding to the arc-shaped support housing is fixed to the outer side of the arc-shaped portion of the metal flexible belt. A connecting plate is commonly fixed to the outer ends of the multiple groups of sliding rods. A second spring is mounted between the connecting plate and the outer wall of the housing. A steel wire rope is fixed to the outer end portion of the tightening block. The steel wire rope penetrates through the housing and extends to be fixed to the connecting plate, and a guide wheel is arranged at the corner where the steel wire rope passes.

[0015] Preferably, a plurality of groups of vertically distributed inner support blocks are fixed to the inner wall of the metal flexible belt. A plurality of vertically distributed arc-shaped grooves are arranged on the outer wall of the technical casing. When the metal flexible belt is tightened, the inner support blocks are clamped in the corresponding arc-shaped grooves.

[0016] Preferably, the sealing mechanism includes an annular expansion bag adhesively fixed to the inner wall of the housing. The outer side of the annular expansion bag is connected to a second electronic valve through a pipeline. The second electronic valve is connected to an external hydraulic station. The annular expansion bag is equipped with a second pressure sensor for monitoring the hydraulic pressure inside the annular expansion bag. An outer annular sealing block is fixed to the inner side of the annular expansion bag. The inner wall of the outer annular sealing block has an annular groove. An inner annular sealing block is adhesively fixed to the outer wall of the oil layer casing, and the inner annular sealing block is adapted to the annular groove.

[0017] Preferably, an annular rubber bag is arranged on the outer side of the inner annular sealing block. Sealing glue is stored in the annular rubber bag. A plurality of annularly distributed piercing members are fixed to the inner side wall of the annular groove. A plurality of grooves are formed on the outer side of the inner annular sealing block, and the plurality of grooves correspond to the plurality of piercing members respectively.

[0018] Preferably, the piercing member includes a cross bar portion and a plurality of spike portions fixed to the end of the cross bar portion. The plurality of spike portions are annularly distributed and inclined outwardly.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention can tighten two metal soft belts through two tensioning and fixing components, and fix the oil layer casing through the arc portions of the two metal soft belts. This installation method is more convenient and efficient, shortens the construction period, and reduces the labor intensity of installers.

[0021] 2. The present invention can also clamp and fix the oil layer casing through the abutting component to achieve double fixation of the oil layer casing and ensure the stability of its installation.

[0022] 3. The support mechanism in the present invention can lift the oil layer casing in a linkage manner and bear the weight of the oil layer casing to ensure the stability of the installation of the oil layer casing.

[0023] 4. The present invention proposes a new sealing method. This sealing method is convenient to operate, reduces the installation intensity of installers, improves work efficiency, and has excellent sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the main sectional view structural schematic diagram of the present invention;

[0025] Figure 2 is Figure 1 the first three-dimensional structural schematic diagram of the suspension and fixing mechanism in

[0026] Figure 3 is Figure 1 the second three-dimensional structural schematic diagram of the suspension and fixing mechanism in

[0027] Figure 4 is Figure 3 the enlarged structural schematic diagram of part A in

[0028] Figure 5 is Figure 1 the top - view structural schematic diagram of the hanging and fixing mechanism in

[0029] Figure 6 is Figure 5 the enlarged structural schematic diagram of part B in

[0030] Figure 7 the side - view sectional structural schematic diagram of the support mechanism;

[0031] Figure 8 is Figure 1 the structural schematic diagram of the sealing mechanism in

[0032] The numbers in the figure represent:

[0033] 1 - housing; 2 - pipeline component; 31 - technical casing; 32 - production casing; 33 - arc - shaped groove; 4 - hanging and fixing mechanism; 41 - metal flexible belt; 42 - inner support block; 43 - tensioning and fixing assembly; 431 - outer vertical plate; 432 - guide rod; 433 - first spring; 434 - hydraulic telescopic rod; 435 - inner frame block; 4361 - mounting block; 4362 - slider; 4363 - connecting block; 4364 - long - shaped wheel; 4365 - half - gear; 4366 - rack; 4367 - pressing block; 437 - convex block; 5 - sealing mechanism; 51 - annular expansion bag; 52 - outer annular seal block; 53 - puncturing piece; 54 - inner annular seal block; 55 - annular rubber bag; 56 - groove; 57 - annular groove; 6 - support mechanism; 61 - outer support block; 62 - arc - shaped support housing; 63 - slide rod; 64 - connecting plate; 65 - second spring; 66 - steel wire rope; 67 - guide wheel. Specific embodiments

[0034] The following further elaborates on the above - mentioned and additional technical features and advantages of the present invention in conjunction with the accompanying drawings.

[0035] This embodiment provides a technical solution: a casing head device based on a pressure control system, as Figure 1 shown in Figure 5 , including a housing 1, a hanging and fixing mechanism 4, two groups of support mechanisms 6, and a sealing mechanism 5. A pipeline component 2 is arranged on the side of the housing 1, and the technical casing 31 is installed on the lower side of the housing 1. The technical casing 31 can be installed by welding, threaded connection, or other existing connection methods. The hanging and fixing mechanism 4 is used to install the production casing 32 inside the housing 1, and the lower end of the production casing 32 penetrates through the technical casing 31.

[0036] As Figures 1 to 6As shown in the figure, the hanging and fixing mechanism 4 includes two metal flexible belts 41 and two tensioning and fixing components 43. The metal flexible belt 41 is integrally made of metal braiding and has a certain flexibility, allowing it to be bent. When the metal flexible belt 41 is tensioned and wrapped around the outer circumferential surface of the technical casing 31 through the two tensioning and fixing components 43, the metal flexible belt 41 forms an arc portion and straightening portions connected to both ends of the arc portion. At this time, the metal flexible belt 41 will be tensioned and adhered to the outer surface of the tubing casing 32. The two tensioning and fixing components 43 are symmetrically installed in the housing 1. The straightening portions at one end of the two metal flexible belts 41 are respectively connected to one of the tensioning and fixing components 43, and the straightening portions at the other end of the two metal flexible belts 41 are respectively connected to the other tensioning and fixing component 43. The two tensioning and fixing components 43 respectively pull and tighten the two ends of the metal flexible belt 41, and the arc portions of the two metal flexible belts 41 squeeze and fix the oil layer casing 32 to achieve the fixation of the oil layer casing 32.

[0037] As shown in Figure 7, in order to strengthen the reliability between the metal flexible belt 41 and the technical casing 31, multiple groups of vertically distributed inner support blocks 42 are fixed on the inner wall of the metal flexible belt 41, and the upper side of the inner support blocks 42 is arranged as a plane. Multiple vertically distributed arc-shaped grooves 33 are provided on the outer wall of the technical casing 31. When the metal flexible belt 41 is tightened, the inner support blocks 42 are clamped in the corresponding arc-shaped grooves 33, thereby stably supporting the technical casing 31.

[0038] As Figures 3 to 6As shown, the tension fixing assembly 43 includes an outer vertical plate 431 fixedly connected to the ends of the straightened portions of two metal flexible belts 41. The outer vertical plate 431 is slidably mounted transversely within the housing 1. Specifically, an installation groove is communicated and opened on the inner wall of the housing 1, and a convex block 437 for restricting the outer vertical plate 431 is fixed on the inner end side wall of the installation groove; a guide rod 432 is fixed on the side wall of the installation groove, and the outer vertical plate 431 is slidably mounted on the guide rod 432, and the outer vertical plate 431 can only be displaced within the installation groove. A plurality of hydraulic telescopic rods 434 are installed inside the outer vertical plate 431. The plurality of hydraulic telescopic rods 434 are connected to a first electronic valve through a pipeline, and a first pressure sensor for monitoring the hydraulic pressure inside the hydraulic telescopic rod 434 is installed on the hydraulic telescopic rod 434. The first electronic valve is connected to an external hydraulic station. The hydraulic station can drive the plurality of hydraulic telescopic rods 434 to operate, causing them to contract or extend. By means of the first electronic valve, the hydraulic flow in the pipeline can be closed, so that the hydraulic telescopic rods 434 are in an extended state for a long time. Based on the pressure monitored by the first pressure sensor, the working pressure of the hydraulic telescopic rods 434 can be controlled. The telescopic end of the hydraulic telescopic rod 434 is fixed with an inner frame block 435. Two symmetrically arranged abutting assemblies are installed inside the inner frame block 435. The abutting assemblies are used to tightly fix the oil layer casing 32 and guide the metal flexible belt 41. A first spring 433 is installed outside the outer vertical plate 431. A spring groove is opened outside the installation groove. One end of the first spring 433 is installed in the spring groove. When the first spring 433 is squeezed, it can be completely compressed into the spring groove, and the outer vertical plate 431 will abut against the side wall of the installation groove.

[0039] As Figure 4 and Figure 6As shown in the figure, the abutting assembly includes a mounting block 4361 installed on the inner frame block 435. Two vertically arranged sliders 4362 are horizontally slidably installed on the mounting block 4361. Specifically, the mounting block 4361 is provided with a chute, and the slider 4362 is slidably arranged in the chute. A long-shaped wheel 4364 is rotatably installed between the two sliders 4362. The long-shaped wheel 4364 contacts the straightened part of the metal soft belt 41. The long-shaped wheels 4364 of the two abutting assemblies can tightly fix the two metal soft belts 41. The mounting block 4361 and the slider 4362 are jointly fixed with an adapter block 4363. The adapter block 4363 can only withstand a certain horizontal force. When the force exceeds the set threshold, the adapter block 4363 will break and split from the mounting block 4361, causing the slider 4362 to move into the chute. A tightening block 4367 is rotatably installed between the two mounting blocks 4361 through a rotating shaft. A semi-gear 4365 is fixed to the rotating shaft, and a rack 4366 meshing with the semi-gear 4365 is fixed to the slider 4362. When the slider 4362 slides, under the cooperation of the rack 4366 and the semi-gear 4365, it will drive the tightening block 4367 to flip towards the oil layer casing 32 until the long-shaped wheel 4364 and the tightening block 4367 simultaneously abut against the oil layer casing 32, and the rack 4366 and the semi-gear 4365 are locked, then the oil layer casing 32 can be fixed through multiple points, increasing the reliability, and the setting of this structure can further fix the oil layer casing 32.

[0040] During use, the oil layer casing 32 is hoisted into the housing 1 by a hoisting device and passes through the gap between the arc-shaped parts of the two metal soft belts 41 (at this time, the gap is larger than the outer diameter of the oil layer casing 32). Subsequently, the telescopic end of the hydraulic telescopic rod 434 is extended, which can cause the inner frame block 435 to displace towards one side of the oil layer casing 32, and the two long-shaped wheels 4364 can straighten the straightened parts of the two metal soft belts 41 until the two long-shaped wheels 4364 abut against the oil layer casing 32 and cannot move. At this time, if the extension of the hydraulic telescopic rod 434 continues, it will push the outer vertical plate 431 outwards. During this process, the metal soft belt 41 will be pulled outwards, and the gap between the arc-shaped parts of the two metal soft belts 41 will be reduced, then the oil layer casing 32 can be fixed by the metal soft belt 41. Finally, the outer vertical plate 431 abuts against the wall of the installation groove. Continuing to extend the telescopic end of the hydraulic telescopic rod 434, the force received by the long-shaped wheel 4364 increases, and finally the rack 4366 separates from the mounting block 4361, and the slider 4362 will contract into the chute. At this time, under the action of the semi-gear 4365 and the rack 4366, it will drive the tightening block 4367 to flip inwards. Finally, the long-shaped wheel 4364 and the tightening block 4367 both tightly fix the metal soft belt 41 on the outer side of the oil layer casing 32 to realize double fixation of the oil layer casing 32 and ensure its stability.

[0041] As Figure 4 And Figure 6As shown, further, in order to enable the abutting component to be disassembled, the mounting block 4361 is detachably connected to the inner frame block 435 through a coupling component. The coupling component includes a convex groove formed in the vertical portion of the inner frame block 435 and a convex strip fixed to the mounting block 4361, and the convex strip is inserted and fixed in the convex groove. When the convex strip is taken out of the convex groove, the abutting component can be disassembled.

[0042] As Figure 5 shown Figure 6 As shown, two sets of support mechanisms 6 are symmetrically arranged on the housing 1 respectively. The support mechanism 6 includes a plurality of sets of slide rods 63 slidably mounted on the housing 1. In order to ensure the stability of the slide rods 63 during sliding, linear bearing barrels can be installed at the corresponding positions of the housing 1. The slide rods 63 pass through the inner cavities of the linear bearing barrels. The inner ends of each set of slide rods 63 are fixedly provided with arc-shaped support housings 62. The interior of the arc-shaped support housing 62 has a support chamber. An outer support block 61 corresponding to the arc-shaped support housing 62 is fixedly provided on the outer side of the arc-shaped portion of the metal soft belt 41. The bottoms of the support chamber and the arc-shaped support housing 62 are both flat. The outer ends of the plurality of sets of slide rods 63 are commonly fixedly provided with a connecting plate 64. A second spring 65 is installed between the connecting plate 64 and the outer wall of the housing 1. The second spring 65 will apply a force to the connecting plate 64 and the arc-shaped support housing 62 to move outward. A steel wire rope 66 is fixedly provided at the outer end of the abutting block 4367 (a steel wire rope 66 is fixedly provided at the outer end of each abutting block 4367, which is simplified in the figure). The steel wire rope 66 passes through the housing 1 and extends to be fixed to the connecting plate 64. Guide wheels 67 are provided at the corners where the steel wire rope 66 passes, for guiding the steel wire rope 66 and reducing the friction force, so that the steel wire rope 66 can be pulled more smoothly.

[0043] When the abutting block 4367 is turned to the side of the oil layer casing 32, the steel wire rope 66 will be pulled, causing the connecting plate 64 and the arc-shaped support housing 62 to move inward and compressing the second spring 65. The outer support block 61 will enter the arc-shaped support housing 62, thereby increasing the support strength for the technical casing 31 and preventing the technical casing 31 from sinking; during disassembly, when the inner frame block 435 moves outward, the abutting block 4367 will automatically turn outward, the steel wire rope 66 will become slack, and the arc-shaped support housing 62 will move outward due to the action of the second spring 65.

[0044] As Figure 1 shown Figure 8As shown in the figure, the sealing mechanism 5 is located on the lower side of the suspension fixing mechanism 4 and is arranged between the inner wall of the oil layer casing 32 and the housing 1 for sealing the gap between the inner wall of the oil layer casing 32 and the housing 1. The sealing mechanism 5 includes an annular expansion bag 51 adhesively fixed to the inner wall of the housing 1. The outer side of the annular expansion bag 51 is connected to a second electronic valve through a pipeline, and the second electronic valve is connected to an external hydraulic station. The annular expansion bag 51 is equipped with a second pressure sensor for monitoring the hydraulic pressure inside the annular expansion bag 51. Hydraulic can be transported into or withdrawn from the annular expansion bag 51 through the hydraulic station, so that the annular expansion bag 51 expands inward. The degree of expansion of the annular expansion bag 51 can be controlled according to the pressure detected by the second pressure sensor. An outer annular sealing block 52 is fixed to the inner side of the annular expansion bag 51, which has a certain shrinkage and deformation performance. The inner wall of the outer annular sealing block 52 has an annular groove 57. An inner annular sealing block 54 is adhesively fixed to the outer wall of the oil layer casing 32, and the inner annular sealing block 54 is adapted to the annular groove 57. When the outer annular sealing block 52 is squeezed inward due to the expansion of the annular expansion bag 51, the inner annular sealing block 54 will enter the annular groove 57 to achieve sealing.

[0045] As Figure 8 shown, further, an annular glue bag 55 is arranged on the outer side of the inner annular sealing block 54. Sealing glue is stored in the annular glue bag 55. The annular glue bag 55 is made of a pierceable material. A plurality of annularly distributed piercing members 53 are fixed to the inner side wall of the annular groove 57. The number and spacing of the piercing members 53 are set according to needs. A plurality of grooves 56 are formed on the outer side of the inner annular sealing block 54, and the grooves 56 are located inside the annular glue bag 55. The plurality of grooves 56 respectively correspond to the plurality of piercing members 53.

[0046] When the annular expansion bag 51 squeezes the outer annular sealing block 52 inward and contracts, the piercing members 53 pierce the annular glue bag 55, so that the sealing glue in the annular glue bag 55 overflows. As the annular expansion bag 51 continues to squeeze, all the sealing glue in the annular glue bag 55 overflows into the gap between the inner annular sealing block 54 and the outer annular sealing block 52, thereby sealing the inner annular sealing block 54 and the outer annular sealing block 52 to ensure the sealing performance. And finally, the piercing members 53 will be located in the grooves 56.

[0047] As Figure 8 shown, further, the piercing member 53 includes a cross bar portion and a plurality of spike portions fixed to the end of the cross bar portion. The plurality of spike portions are annularly distributed and are inclined outward. This setting can make the hole pierced in the annular glue bag 55 larger and will not be blocked by the piercing member 53 itself, so as to ensure the smooth and rapid overflow of the sealing glue in the annular glue bag 55.

[0048] The above are only the preferred embodiments of the present invention, which are illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, or even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all of them will fall within the protection scope of the present invention.

Claims

1. A casing head device based on a pressure control system, characterized in that: include: Shell, the technical sleeve is installed on the lower side of the shell; A hanging and fixing mechanism, wherein the hanging and fixing mechanism is used to install the oil layer casing inside the shell, and the lower end of the oil layer casing passes through the technical casing; and A sealing mechanism, which is located at the lower side of the suspension fixing mechanism and is arranged between the oil layer casing and the inner wall of the shell; Wherein, the hanging and fixing mechanism includes two metal soft belts and two tensioning and fixing components, and the two metal soft belts each include an arc-shaped portion wrapped around the outer circumferential surface of the technical casing and a straightening portion connected to both ends of the arc-shaped portion, and the two tensioning and fixing components are symmetrically installed in the shell, and the straightening portions at one end of the two metal soft belts are connected to one of the tensioning and fixing components, and the straightening portions at the other end of the two metal soft belts are connected to the other tensioning and fixing component, and the two tensioning and fixing components respectively tighten and straighten the two ends of the metal soft belts to achieve the fixation of the oil layer casing; The tightening and fixing assembly comprises an outer vertical plate fixed to the ends of the straightened parts of the two metal soft belts, the outer vertical plate is installed in the housing in a transverse sliding manner, a plurality of hydraulic telescopic rods are installed on the inner side of the outer vertical plate, the plurality of hydraulic telescopic rods are connected to a first electronic valve through a pipeline, and the hydraulic telescopic rod is installed with a first pressure sensor for monitoring the hydraulic pressure in the hydraulic telescopic rod, the first electronic valve is connected to an external hydraulic station, an inner frame block is fixed to the telescopic end of the hydraulic telescopic rod, two symmetrically arranged abutment assemblies are installed on the inner side of the inner frame block, and a first spring is installed on the outer side of the outer vertical plate; The abutment assembly includes a mounting block installed on the inner frame block, two upper and lower sliders are installed on the mounting block for horizontal sliding movement, a long wheel is rotatably installed between the two sliders, a connecting block is fixed together with the mounting block and the slider, a tightening block is rotatably installed between the two mounting blocks via a rotating shaft, a half gear is fixed on the rotating shaft, and a rack meshing with the half gear is fixed on the slider.

2. The casing head device based on the pressure control system according to claim 1, characterized in that: The mounting block is detachably connected to the inner frame block via a coupling assembly, wherein the coupling assembly comprises a convex groove provided in the vertical portion of the inner frame block and a convex bar fixed to the mounting block, and the convex bar is inserted and fixed in the convex groove.

3. The casing head device based on the pressure control system according to claim 1, characterized in that: The inner wall of the shell is connected to form a mounting groove, the outer side of the mounting groove is provided with a spring groove, one end of the first spring is installed in the spring groove, the inner end side wall of the mounting groove is fixed with a protrusion that limits the outer vertical plate; the side wall of the mounting groove is fixed with a guide rod, and the outer vertical plate is slidably installed on the guide rod.

4. The casing head device based on the pressure control system according to claim 1, characterized in that: The casing head device also includes two groups of support mechanisms, which are symmetrically arranged on the shell. The support mechanisms include multiple groups of sliding rods slidably installed on the shell, and the inner ends of each group of sliding rods are fixed with an arc-shaped support shell. The outer side of the arc-shaped portion of the metal soft belt is fixed with an external support block corresponding to the arc-shaped support shell. The outer ends of the multiple groups of sliding rods are commonly fixed with a connecting plate, and a second spring is installed between the connecting plate and the outer wall of the shell. A steel wire rope is fixed to the outer end of the tightening block. The steel wire rope passes through the shell and extends to be fixed to the connecting plate. A guide wheel is provided at the corner where the steel wire rope passes.

5. The casing head device based on the pressure control system according to claim 1, characterized in that: The inner wall of the metal soft belt is fixed with multiple groups of vertically distributed inner support blocks, and the outer wall of the technical sleeve is provided with multiple vertically distributed arc grooves. When the metal soft belt is tightened, the inner support blocks are clamped in the corresponding arc grooves.

6. The casing head device based on the pressure control system according to claim 1, characterized in that: The sealing mechanism includes an annular expansion bag bonded and fixed to the inner wall of the shell, the outer side of the annular expansion bag is connected to a second electronic valve through a pipeline, the second electronic valve is connected to an external hydraulic station, the annular expansion bag is equipped with a second pressure sensor for monitoring the hydraulic pressure in the annular expansion bag, an outer annular sealing block is fixed to the inner side of the annular expansion bag, the inner wall of the outer annular sealing block has an annular groove, the outer wall of the oil layer casing is bonded and fixed with an inner annular sealing block, the inner annular sealing block is adapted to the annular groove.

7. The casing head device based on the pressure control system according to claim 6, characterized in that: An annular plastic bag is arranged on the outer side of the inner annular sealing block, and sealant is stored in the annular plastic bag. A plurality of annularly distributed piercing members are fixed to the inner side wall of the annular groove. A plurality of grooves are opened on the outer side of the inner annular sealing block, and the plurality of grooves respectively correspond to the plurality of piercing members.

8. The casing head device based on the pressure control system according to claim 7, characterized in that: The piercing member comprises a crossbar portion and a plurality of spike portions fixed to the end of the crossbar portion, wherein the plurality of spike portions are distributed in a ring shape and are arranged obliquely on the outside.

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