Casing hanging type thermal recovery casing head

Abstract

The invention relates to the technical field of casing heads, in particular to a casing hanging type thermal recovery casing head which comprises an upper flange seat, a casing head body and a lower flange seat. The casing head is formed by splicing a rear shell and a front shell, and the rear shell is provided with a division bar which is connected with the embedding groove of the front shell in an inserted mode. An external thread and an annular groove are arranged on the outer wall of the connecting pipe, and the connecting pipe is screwed with an internal thread groove of the casing head; a radial limiting assembly and a self-locking assembly are arranged in the rear shell. A radial limiting block is in linkage with a ratchet bar through a movable base, a pawl is meshed with the ratchet bar, and one-way locking force is provided by an L-shaped elastic piece. The upper flange seat and the lower flange seat are both provided with longitudinal butt joint strips, and are fixed through a fastening assembly in a boss after being inserted into a casing head; the rotating pins are automatically clamped into lateral engagement grooves of the longitudinal butt joint strips under magnetic repulsive force; the supporting plate drives the auxiliary limiting block to conduct synchronous clamping through the inclined groove mechanism, and the position is locked through the hanging lug. The problems that a traditional thermal recovery casing head is difficult to disassemble and high-temperature sealing fails are solved, and the quick disassembly and assembly performance and the high-temperature reliability are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of casing heads, in particular to a casing hanging type thermal recovery casing head. Background Art

[0002] In heavy oil thermal recovery, processes like steam stimulation and SAGD require downhole tools to withstand long-term high temperatures and periodic thermal stress shocks. As a key wellhead component, the casing head fulfills the core functions of suspending the casing string, sealing the annulus, and providing an interface for subsequent completions.

[0003] Traditional thermal recovery casing heads generally use an integral threaded connection structure. Although it can achieve high-pressure sealing, the casing string needs to be cut or disassembled in its entirety during maintenance. This operation takes up to several weeks and is very likely to damage the casing body. Secondly, although the existing slip-type casing heads can be installed quickly, they are prone to sealing failure under thermal cycling loads. In addition, the slip tooth marks aggravate the damage to the casing wall under high temperature stress.

[0004] Therefore, there is an urgent need for a new casing head structure that has both high-temperature sealing reliability and rapid disassembly to break through the bottleneck that restricts thermal recovery efficiency in existing technologies. Summary of the Invention

[0005] The object of the present invention is to provide a casing hanging type thermal recovery casing head to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a casing hanging type thermal recovery casing head, comprising an upper flange seat, a casing head, and a lower flange seat, wherein the casing head is composed of a rear shell and a front shell that can be separably spliced; A connecting pipe is provided at the lower end of the upper flange seat, which passes through the casing head and the lower flange seat in sequence. The outer wall of the connecting pipe is provided with an external thread and an annular groove, and the inner wall of the casing head is provided with an internal thread groove that is screwed together with the external thread; At least two sets of radial limiting components are provided in the rear housing, and the components include a slidable movable seat, a radial limiting block fixed to the movable seat, and a ratchet bar linked to the movable seat; the radial limiting block is engaged in the annular groove after the pipe is screwed in, thereby achieving secondary locking of the pipe; A self-locking assembly is provided in the rear housing, which includes a pawl engaged with the ratchet bar and an L-shaped spring piece for preventing the ratchet bar from rebounding; The upper flange seat and the lower flange seat are both provided with longitudinal docking strips on one side close to the casing head, and the joint end of the rear shell and the front shell is provided with an insert block and a rectangular slot for accommodating the insert block; The longitudinal butt joint strip is inserted into the sleeve head and fixed by the fastening assembly in the boss, so that the insert block forms an integral structure under the limit of the longitudinal butt joint strip, thereby realizing quick disassembly and assembly.

[0007] Preferably, a partition strip is provided on one side of the rear housing close to the front housing, and a fitting groove for accommodating the partition strip is provided on the side wall of the front housing; Both the radial limiting component and the self-locking component are arranged on the rear housing, and the internal mechanism is exposed after the front housing is disassembled.

[0008] Preferably, a first inclined groove is formed in the moving seat, and the ratchet rack is inserted into the first inclined groove through a cylindrical pin; The upper end of the ratchet rack abuts against the bottom wall of the upper flange seat, and a first spring is provided at the lower end; When the upper flange seat is pressed down, it pushes the ratchet rack to move downward, converts the movement direction through the inclined surface of the first inclined groove, and drives the moving seat to drive the radial limiting block to radially engage with the annular groove.

[0009] Preferably, the middle of the pawl is rotatably mounted on the rear housing through a central shaft, one end of the pawl engages with the ratchet rack, and the other end of the pawl abuts against the L-shaped elastic sheet; The elastic sheet provides continuous pressure to unidirectionally lock the ratchet rack by the pawl, only allowing it to move downward.

[0010] Preferably, the number of the longitudinal docking strips is more than four and is evenly distributed, and the insertion block is provided with a square opening for the longitudinal docking strips to penetrate; After the longitudinal docking strips are inserted, the displacement of the insertion block is restricted, realizing the synchronous fixation of the rear housing and the front housing.

[0011] Preferably, the fastening component includes a rotating pin rotatably arranged in the boss, one end of the rotating pin is provided with a connecting block and a handle, and the other end is clamped into the lateral biting groove on the side wall of the longitudinal docking strip; A first magnet is arranged in the boss, and a second magnet with the same magnetic pole as the first magnet is arranged on the connecting block, and the magnetic repulsive force maintains the clamped state of the rotating pin.

[0012] Preferably, when the longitudinal docking strip is inserted, it jacks up the inclined surface end of the rotating pin, and when the lateral biting groove is aligned, the magnetic repulsive force drives the rotating pin to automatically clamp in; An arc-shaped groove for accommodating the handle is formed on the outer wall of the boss, and the handle can be reversed to overcome the magnetic force to separate the rotating pin.

[0013] Preferably, two groups of auxiliary positioning components are arranged in the boss, including a portal frame and an auxiliary limiting block; A second inclined groove is formed on the portal frame, and a clamping column is inserted into the second inclined groove and fixedly connected to the driven strip.

[0014] Preferably, one end of the driven strip is fixedly connected to a support plate, and a third spring is arranged at the other end; a clamping groove is formed on the side wall of the support plate; When the support plate moves horizontally, it drives two groups of portal frames to move towards each other through the inclined surface of the second inclined groove, so that the auxiliary limiting block is clamped into or disengaged from the lateral biting groove.

[0015] Preferably, the support plate is located below the connecting block and restricts its rotation; when the auxiliary limiting block is clamped in, the anti-pulling force of the longitudinal docking strip is enhanced; The No. 3 spring pushes the follower bar to reset, so that the auxiliary limit block is separated from the lateral bite groove.

[0016] Preferably, both sides of the boss are provided with a clamping assembly, the clamping assembly comprising a rotating lug, a second spring, a contact block and an L-shaped push rod; The active end of the hanging ear is connected to the No. 2 spring and contacts the L-shaped push rod, and the driven end is a hook-shaped structure that is inserted into the slot.

[0017] Preferably, the contact block pushes the L-shaped push rod under external pressure, so that the hanging ear squeezes the second spring out of the slot; At this time, the No. 3 spring pushes the support plate to return to its original position, releasing the engagement of the docking block limit and the auxiliary limit block.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Compared to traditional thermal recovery casing head disassembly, which requires integral cutting or reverse-cutting, resulting in long operation cycles and the potential for casing damage, the present invention utilizes a detachable housing structure. The rear and front housings are connected via spacers and interlocking grooves, combined with a longitudinal docking bar locking mechanism to achieve modular assembly. The internal rotating pin mechanism of the boss utilizes a magnetic self-locking principle, allowing the longitudinal restraint to be released with a simple turn of the handle. During disassembly, pressing the contact block in conjunction with the hanging ear releases the support plate, simultaneously disengaging the auxiliary stop block and the rotating pin, allowing the flange seat to be quickly separated from the housing. Subsequently, the pawl is turned to release the radial stop block, significantly shortening the maintenance cycle.

[0019] 2. To address seal failure under thermal cycling conditions, this invention employs a dual structure: initial thread lock and radial mechanical hard lock. The external thread of the pipe and the internal thread groove of the casing head are screwed together to form the primary seal. When the upper flange seat is pressed downward, the ratchet bar, through the beveled groove, drives the radial stopper into the annular groove, creating a rigid lock that resists thermal stress. The pawl in the self-locking assembly is continuously compressed by the spring, and the one-way locking ratchet bar rebounds, effectively preventing the stopper from loosening due to thermal expansion and significantly improving seal stability.

[0020] 3. The rear housing, front housing, and internal components form independent modules through the assembly design of inserts and rectangular slots. During maintenance, damaged parts can be replaced specifically to avoid overall scrapping. The radial stoppers and annular grooves utilize a non-interlocking stop structure, eliminating mechanical scratches during disassembly. This protects the integrity of the pipe surface, extends the service life of the casing, and reduces the need for spare parts inventory.

[0021] 4. The boss fastening assembly integrates plug-in self-locking and push-to-lock operation. Insertion of the longitudinal butt joint automatically triggers the magnetic engagement of the pivot pin, eliminating manual alignment errors. The support plate moves through the inclined slot, driving the portal frame to simultaneously tighten the auxiliary stop block, enhancing longitudinal pull-out resistance. During disassembly, a single-point press on the contact block releases the mounting bracket lock, resets the support plate, and simultaneously releases the pivot pin and auxiliary stop block, streamlining the operation and reducing the risk of error. Brief Description of the Drawings

[0022] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the present invention in a cut-open state.

[0024] Figure 3 It is an exploded schematic diagram of the casing head of the present invention.

[0025] Figure 4 It is an exploded schematic diagram of the upper flange seat, lower flange seat, rear housing and connecting pipe of the present invention.

[0026] Figure 5 It is a three-dimensional schematic diagram of the rear housing of the present invention.

[0027] Figure 6 It is a schematic diagram of the ratchet rack and the moving seat of the present invention.

[0028] Figure 7 It is a connection schematic diagram of the ratchet rack, ratchet pawl and elastic piece of the present invention.

[0029] Figure 8 It is a schematic diagram of the boss, inserting block and longitudinal docking strip of the present invention.

[0030] Figure 9 It is a cut-open schematic diagram of the boss of the present invention.

[0031] Figure 10 It is a schematic diagram of the separated state of the rotating pin and the longitudinal docking strip of the present invention.

[0032] Figure 11 It is a connection schematic diagram of the supporting plate and the clamping assembly of the present invention.

[0033] In the figure: 1. Upper flange seat; 2. Lower flange seat; 3. Rear housing; 301. Partition strip; 4. Front housing; 5. Internal thread groove; 6. Connecting pipe; 601. External thread; 602. Annular groove; 7. Inserting block; 8. Rectangular slot; 9. Longitudinal docking strip; 901. Lateral biting groove; 10. Boss; 11. Radial limiting block; 12. Moving seat; 13. First inclined groove; 14. Cylindrical pin; 15. Ratchet rack; 16. First spring; 17. Ratchet pawl; 18. Elastic piece; 19. Rotating pin; 20. Connecting block; 21. Handle; 22. Supporting plate; 2201. Card slot; 23. Hanging ear; 24. Second spring; 25. L-shaped push rod; 26. Contact block; 27. Driven strip; 28. Clamping post; 29. Second inclined groove; 30. Gate-shaped frame; 31. Auxiliary limiting block; 32. Third spring. Detailed Description of the Invention

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1 to 11 , the present invention provides a technical solution: a casing hanger type thermal recovery casing head, which successively includes an upper flange seat 1, a casing head, and a lower flange seat 2 from top to bottom. A connecting pipe 6 is provided at the lower end of the upper flange seat 1, and the connecting pipe 6 penetrates through the casing head and the lower flange seat 2. An internal thread groove 5 is opened on the inner wall of the upper half of the casing head. An external thread 601 and an annular groove 602 are successively provided on the outer wall of the connecting pipe 6. The external thread 601 is in threaded connection and cooperation with the internal thread groove 5 to realize the preliminary sealing and fixing of the connecting pipe 6 and the casing head; there are no less than two groups of radial limiting components arranged on the casing head. The radial limiting components include a radial limiting block 11, a moving seat 12, a ratchet rack 15, and a first spring 16. The moving seat 12 and the ratchet rack 15 are limited and slidably installed in the casing head. One end of the radial limiting block 11 is fixedly connected to the moving seat 12, and the other end of the radial limiting block 11 is clamped in the annular groove 602; a first inclined groove 13 is opened through the moving seat 12. One end of the ratchet rack 15 is fixedly connected with a cylindrical pin 14 inserted into the first inclined groove 13. The other end of the ratchet rack 15 extends out of the upper end wall of the casing head and is in contact connection with the bottom wall of the upper flange seat 1. And an assembly groove is recessed on one side of the ratchet rack 15 close to the connecting pipe 6, and a first spring 16 is fixedly arranged on the upper end wall of the assembly groove; through the cooperative action of the ratchet rack 15, the first spring 16, the cylindrical pin 14, the first inclined groove 13, and the moving seat 12, after the upper flange seat 1 and the casing head are butted, the radial limiting block 11 can be quickly inserted into the annular groove 602 therewith for further limiting and fixing the connecting pipe 6.

[0036] As Figures 5 - 7 shown, in order to avoid the problem of the ratchet rack 15 running upwards caused by the loosening of the butt joint between the upper flange seat 1 and the casing head during use, a self-locking component for limiting the ratchet rack 15 is further arranged in the casing head. The self-locking component includes a ratchet pawl 17 and a spring piece 18. The spring piece 18 is of an L-shaped structure and one end of it is fixedly arranged inside the casing head. The middle of the ratchet pawl 17 is rotatably installed inside the casing head through a central shaft. One end of the ratchet pawl 17 meshes with the ratchet rack 15, and the other end of the ratchet pawl 17 is in contact connection with the spring piece 18. Through the design of the ratchet pawl 17 and the spring piece 18, a self-locking effect is achieved, so that the ratchet rack 15 can only be pushed and moved downwards by the upper flange seat 1, and will not run upwards due to the position change of the upper flange seat 1, so that the radial limiting block 11 can be stably clamped in the annular groove 602.

[0037] AsFigures 3 - 5 As shown in the figure, in order to facilitate the overhaul and maintenance of the adapter pipe 6 and the internal components of the casing head, the casing head is provided with a detachable structure. The casing head includes a rear housing 3 and a front housing 4. The radial limit assembly and the self-locking assembly are both arranged on the rear housing 3. A partition strip 301 is protrudingly arranged on one side of the rear housing 3 close to the front housing 4. A fitting groove for accommodating the partition strip 301 is formed on the side wall of the front housing 4. Two groups of insertion blocks 7 are symmetrically arranged at both the right end of the rear housing 3 and the left end of the front housing 4. Rectangular slots 8 for accommodating the insertion blocks 7 are formed at both the left end of the rear housing 3 and the right end of the front housing 4.

[0038] As Figure 4 well as Figure 8 shown in the figure, in order to facilitate the quick assembly of the casing head with the upper and lower flange seats 2, a plurality of longitudinally docking strips 9 distributed in an annular array are protrudingly arranged on one side of both the upper flange seat 1 and the lower flange seat 2 close to the casing head. The longitudinally docking strips 9 are provided with no less than four, and the number is selected to be an even number. Such a setting can ensure that each insertion block 7 can be plugged and limited by the longitudinally docking strips 9; each longitudinally docking strip 9 is plugged on the casing head and fixed by a fastening assembly; a square opening for accommodating the longitudinally docking strip 9 is formed on each insertion block 7; in actual assembly, the rear housing 3 and the front housing 4 are first spliced, and then the upper flange seat 1 and the lower flange seat 2 are docked with the casing head. In this way, after the longitudinally docking strips 9 are inserted into the casing head, the insertion blocks 7 can be limited and fixed, thus greatly simplifying the assembly steps.

[0039] As Figures 8 - 10 shown in the figure, the fastening assembly includes a boss 10, a rotating pin 19, a connecting block 20 and a handle 21. The end of the longitudinally docking strip 9 extends into the boss 10 and a lateral biting groove 901 is formed on its side wall. The middle of the rotating pin 19 is rotatably installed in the boss 10 through a pin shaft. One end of the rotating pin 19 is fixedly connected with the connecting block 20. The other end of the rotating pin 19 is rotatably engaged in the lateral biting groove 901. A handle 21 is fixedly arranged on the front side of the connecting block 20. The end of the handle 21 away from the connecting block 20 extends out of the boss 10 to the outside. An arc-shaped groove for accommodating the handle 21 is formed on the outer wall of the boss 10; a first magnet is fixedly arranged inside the boss 10 directly above the connecting block 20. A second magnet with the same polarity as the first magnet is fixedly arranged on the side wall of the connecting block 20. Through the magnetic force between the same-sex magnets, the rotating pin 19 is stably engaged in the lateral biting groove 901 without external force. When the longitudinally docking strip 9 is inserted into the boss 10, its end will first act on the inclined surface end of the rotating pin 19 and push it up until the lateral biting groove 901 is just located at the position of the rotating pin 19. At this time, under the repulsive force between the magnets, the rotating pin 19 quickly flips downward and is engaged in the lateral biting groove 901.

[0040] As Figures 10 - 11As shown, in order to further fix the longitudinal docking strip 9, two sets of auxiliary positioning components symmetrical about the longitudinal docking strip 9 are provided in each boss 10. The auxiliary positioning components include a driven strip 27, a gantry 30 and an auxiliary limiting block 31. The gantry 30 is installed in the boss 10 in a limited sliding manner and fixedly connected to the auxiliary limiting block 31. A lateral biting groove 901 for accommodating the auxiliary limiting block 31 is provided on the outer wall of the longitudinal docking strip 9. A second inclined groove 29 is provided on the gantry 30, and a clamping post 28 is inserted into the second inclined groove 29. One end of the driven strip 27 is fixedly connected to the clamping post 28, and the other end of the driven strip 27 protrudes and is fixedly connected to a support plate 22. The support plate 22 is installed in the boss 10 in a limited sliding manner and performs bottom limiting on the docking block 20, so as to prevent the rotation pin 19 from reversing; and a third spring 32 is fixedly provided on one side of the protruding end of the driven strip 27 close to the gantry 30. Through the design of the driven strip 27, the gantry 30, the second inclined groove 29 and the clamping post 28, the horizontal movement of the support plate 22 can be converted into the linear opposite movement of the two gantries 30, so that the auxiliary limiting block 31 can adaptively press or loosen the longitudinal docking strip 9 according to the movement state of the support plate 22.

[0041] As Figure 8 and Figure 11 shown, clamping grooves 2201 are symmetrically provided on the side wall of the support plate 22. In order to achieve the quick fixing effect of the support plate 22, a set of clamping components is provided on both sides of the support plate 22 in the boss 10. The clamping components include a hanging ear 23, a second spring 24, a contact block 26 and an L-shaped push rod 25. The middle part of the hanging ear 23 is rotatably installed in the boss 10 through a rotating shaft. The hanging ear 23 is divided into a driving end and a driven end. One side of the driving end is fixedly connected to the second spring 24, and the other side of the driving end is in contact connection with the end of the L-shaped push rod 25. The driven end is provided with a hook-shaped structure and is clamped in the clamping groove 2201. The contact block 26 extends into the boss 10 from the outside and is fixedly connected to the L-shaped push rod 25. When the support plate 22 moves towards the docking block 20, the driven end of the hanging ear 23 is clamped in the clamping groove 2201 to realize the quick positioning of the support plate 22; when the contact block 26 is pressed to push the L-shaped push rod 25 to move towards the driven strip 27, the L-shaped push rod 25 acts on the driving end of the hanging ear 23, and the hanging ear 23 is forced to squeeze the second spring 24 and is pulled out of the clamping groove 2201. At this time, under the elastic force of the third spring 32, the support plate 22 and the driven strip 27 both move away from the gantry 30. At this time, the bottom limiting effect of the support plate 22 on the rotation pin 19 is released, and the auxiliary limiting block 31 is pulled out of the lateral biting groove 901 to release the longitudinal limiting effect on the longitudinal docking strip 9.

[0042] During use: first, splice the entire sleeve head with the lower flange seat 2. At this time, under the limiting action of the longitudinal docking strip 9 on the lower flange seat 2, the rear shell 3 and the front shell 4 are preliminarily positioned. Then, the connecting pipe 6 is screwed into the sleeve head through the cooperation of the external thread 601 and the internal thread groove 5. Then, the upper flange seat 1 is spliced on the upper end face of the sleeve head, and the longitudinal docking strip 9 is inserted into the boss 10 to achieve fixation, thereby greatly improving the assembly efficiency. The ratchet bar 15 drives the cylindrical pin 14 to move downward under the extrusion of the upper flange seat 1. The cylindrical pin 14 acts on the first inclined groove 13, so that the movable seat 12 is forced to drive the radial limit block 11 to quickly clamp in the annular groove 602, and the connecting pipe 6 is double-positioned. Combined with the threaded connection method, it has both high-temperature sealing reliability and quick disassembly.

[0043] When it is necessary to inspect the inside of the casing head, first press the contact block 26 to push the L-shaped push rod 25 to move in the direction of the driven bar 27. The L-shaped push rod 25 acts on the active end of the ear 23, and the ear 23 is squeezed by the force of the No. 2 spring 24 and pulled out from the slot 2201. At this time, under the elastic force of the No. 3 spring 32, the support plate 22 and the driven bar 27 are both moved in the direction away from the door frame 30. At this time, the support plate 22 releases the bottom limiting effect on the rotating pin 19, and the auxiliary limiting block 31 is pulled out from the lateral bite groove 901, thereby releasing the longitudinal limiting effect on the longitudinal docking strip 9. At this time, the handle 21 is turned counterclockwise, so that the connecting block 20 overcomes the repulsive force between the magnets and drives the rotating pin. 19 is pulled out from the lateral bite groove 901, and the longitudinal docking strips 9 can be pulled out one by one from the casing head. At this time, the upper flange seat 1 and the lower flange seat 2 are detached from the thermal recovery casing head, so as to facilitate the disassembly of the front shell 4 and the rear shell 3; and as the front shell 4 and the rear shell 3 are disassembled, the pawl 17 can be easily moved to release the locking effect of the ratchet bar 15, so that the ratchet bar 15 is quickly bounced upward under the elastic force of the No. 1 spring 16, and the cylindrical pin 14 on the ratchet bar 15 acts on the first inclined groove 13, so that the movable seat 12 is forced to pull the radial limit block 11 out of the annular groove 602, and the connecting pipe 6 can be disassembled from the rear shell 3, which is convenient for later inspection and maintenance.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A casing hanger type thermal recovery casing head, comprising an upper flange seat, a casing head, and a lower flange seat, characterized in that: The casing head is composed of a rear housing and a front housing that can be detachably spliced; A connecting pipe is provided at the lower end of the upper flange seat. The connecting pipe sequentially penetrates through the casing head and the lower flange seat. The outer wall of the connecting pipe is provided with an external thread and an annular groove, and the inner wall of the casing head is provided with an internal thread groove that is screwed and matched with the external thread; At least two groups of radial limiting components are provided inside the rear housing. The component includes a slidable moving seat, a radial limiting block fixedly connected to the moving seat, and a ratchet rack linked with the moving seat; the radial limiting block is clamped into the annular groove after the connecting pipe is screwed in to realize secondary locking of the connecting pipe; A self-locking component is provided inside the rear housing, which includes a pawl meshing with the ratchet rack and an L-shaped elastic sheet for preventing the ratchet rack from rebounding; Longitudinal docking strips are provided on one side of the upper flange seat and the lower flange seat close to the casing head. The splicing end of the rear housing and the front housing is provided with an insertion block and a rectangular slot for accommodating the insertion block; The longitudinal docking strip is inserted into the casing head and fixed by a fastening component inside the boss, so that the insertion block forms an integral structure under the limitation of the longitudinal docking strip to realize quick disassembly and assembly.

2. The casing hanger type thermal recovery casing head according to claim 1, characterized in that: A partition strip is provided on one side of the rear housing close to the front housing, and a fitting groove for accommodating the partition strip is provided on the side wall of the front housing; The radial limiting component and the self-locking component are both arranged in the rear housing, and the internal mechanism is exposed after the front housing is disassembled.

3. The casing hanger type thermal recovery casing head according to claim 1, characterized in that: The moving seat is provided with a first inclined groove, and the ratchet rack is inserted into the first inclined groove through a cylindrical pin; The upper end of the ratchet rack abuts against the bottom wall of the upper flange seat, and a first spring is provided at the lower end; When the upper flange seat is pressed down, it pushes the ratchet rack to move downward, and the movement direction is converted through the inclined surface of the first inclined groove to drive the moving seat to drive the radial limiting block to radially clamp into the annular groove.

4. The casing hanger type thermal recovery casing head according to claim 3, characterized in that: The middle part of the pawl is rotatably installed on the rear housing through a central shaft. One end of the pawl meshes with the ratchet rack, and the other end of the pawl abuts against the L-shaped elastic sheet; The elastic sheet provides continuous pressure to unidirectionally lock the ratchet rack by the pawl, only allowing it to move downward.

5. The casing hanger type thermal recovery casing head according to claim 1, wherein: The number of the longitudinal docking strips is more than four and is evenly distributed in an even number. The insertion block is provided with a square opening for the longitudinal docking strip to penetrate through; After the longitudinal docking strip is inserted, it restricts the displacement of the insertion block to realize synchronous fixation of the rear housing and the front housing.

6. The casing hanger type thermal recovery casing head according to claim 1, wherein: The fastening component includes a rotating pin rotatably arranged in the boss. One end of the rotating pin is provided with a connecting block and a handle, and the other end is clamped into the lateral biting groove on the side wall of the longitudinal docking strip; A first magnet is arranged in the boss, and a second magnet with the same magnetic pole as the first magnet is arranged on the connecting block. The magnetic repulsive force maintains the clamping state of the rotating pin.

7. The casing hanger type thermal recovery casing head according to claim 6, wherein: When the longitudinal docking strip is inserted, it jacks up the inclined surface end of the rotating pin. When the lateral biting groove is aligned, the magnetic repulsive force drives the rotating pin to automatically clamp in; An arc-shaped groove for accommodating the handle is opened on the outer wall of the boss, and the handle can be reversely turned to overcome the magnetic force to separate the rotating pin.

8. The casing hanger type thermal recovery casing head according to claim 6, wherein: Two groups of auxiliary positioning components are arranged in the boss, including a portal frame and an auxiliary limiting block; A second inclined groove is opened on the portal frame, and a clamping column is inserted into the second inclined groove and fixedly connected to the driven strip.

9. The casing hanger type thermal recovery casing head according to claim 8, characterized in that: One end of the driven strip is fixedly connected to a support plate, and a third spring is arranged at the other end; a clamping groove is opened on the side wall of the support plate; When the support plate moves horizontally, it drives two groups of portal frames to move towards each other through the inclined surface of the second inclined groove, so that the auxiliary limiting block is clamped into or disengaged from the lateral biting groove.

10. The casing hanger type thermal recovery casing head according to claim 9, characterized in that: The support plate is located below the connecting block and restricts its rotation; when the auxiliary limiting block is clamped in, the anti-pulling force of the longitudinal docking strip is enhanced; The third spring pushes the driven strip to reset, so that the auxiliary limiting block disengages from the lateral biting groove.

11. The casing hanger type thermal recovery casing head according to claim 9, characterized in that: On both sides of the convex platform, there are clamping components, and each clamping component includes a rotating lug, a second spring, a contact block and an L-shaped push rod; The active end of the lug is connected to the second spring and abuts against the L-shaped push rod, and the driven end is a hook-shaped structure that is snapped into the card slot.

12. The casing hanger type thermal recovery casing head according to claim 11, wherein: The contact block pushes the L-shaped push rod under external force pressing, so that the lug squeezes the second spring and disengages from the card slot; At this time, the third spring pushes the support plate to reset, releasing the limit of the docking block and the engagement of the auxiliary limit block.

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