Casing head sealing performance testing device

Abstract

The invention relates to the technical field of casing head detection equipment, and discloses a casing head sealing performance testing device, which comprises a lower placing frame, a lower placing frame, a lower placing frame, an upper placing frame and a lower placing frame, and is characterized in that the casing head is erected on the lower placing frame; the two symmetrically arranged upper fixing frames are erected at the top end of the casing head; the upper sealing assembly is installed on the two upper fixing frames, and the upper sealing assembly is used for blocking the top end of the casing head; and the lower sealing assembly is used for blocking the top end of the casing head, the lower sealing assembly is installed on the two upper fixing frames through the screw type lifting assembly, and the lower sealing assembly and the upper sealing assembly apply force in two directions. According to the casing head sealing performance testing device disclosed by the invention, the upper sealing assembly and the lower sealing assembly apply force to the top end and the bottom end of the casing head in two directions, so that the side inclination of the casing head is reduced, and the stability of the top end of the casing head is improved.

Description

Technical Field

[0001] The invention relates to the technical field of casing head detection equipment, in particular to a casing head sealing test device. Background Art

[0002] The casing head is used to fix the wellhead of the well, connect the wellhead casing string, support the gravity of the technical casing and the oil layer casing, seal the annular space between the layers of pipes, provide a transition connection for the installation of the blowout preventer, tubing head, and Christmas tree, and through the two side ports on the casing head body, it can be used for construction operations such as mud squeezing, monitoring, and filling balance fluid. According to the requirements of GB / T22513-2013 and API Spec 6A standards, the casing head must be tested for sealing before leaving the factory. For conventional casing heads, the pressure test is usually performed by sealing the bottom with a steel plug and adding a blind flange, adding a blind flange on the top, and sealing with a steel gasket between the two flanges. Although the pressure test process can be completed, it will cause damage to the sealing gasket groove of the casing head body, and the indentation of the gasket groove will affect the sealing.

[0003] Chinese patent CN210689950U discloses a casing head sealing test device, including a casing head, a second sealing mechanism and a first sealing mechanism respectively arranged at the upper and lower ends of the casing head, and the casing head sealing test device also includes a hydraulic cylinder arranged above the casing head, and the piston rod of the hydraulic cylinder is connected to a pressure plate, and the pressure plate is concentric with the casing head. The casing head sealing test device can improve work efficiency, reduce labor intensity, and effectively avoid wear and scratches on the inner wall of the casing head during sealing. However, the casing head is placed in a wide-upper-narrow-lower-side style, resulting in a high center of gravity. When the pressure plate drives the second sealing mechanism to press down the upper end of the casing head, the force direction is unique. Once it is not centered or eccentric, the casing head as a whole is easy to tilt, which poses certain safety hazards. Summary of the invention

[0004] In order to achieve the above object, the present invention discloses a casing head sealing test device, comprising:

[0005] A lower placing frame, on which the casing head is placed;

[0006] Upper fixing frames, two symmetrically arranged upper fixing frames are mounted on the top of the casing head;

[0007] An upper sealing assembly is installed on two upper fixing frames and is used to seal the top of the casing head;

[0008] The lower sealing assembly is used to seal the top of the casing head. The lower sealing assembly is installed on two upper fixing frames through a screw-type lifting assembly. The lower sealing assembly and the upper sealing assembly apply force in both directions.

[0009] Preferably, the upper sealing assembly comprises:

[0010] An upper sealing cover is slidably mounted on two upper fixing frames and is arranged close to the bottom end of the upper fixing frames. The cover end of the upper sealing cover is buckled on the top end of the casing head. The screw-type lifting assembly passes through the center position of the top end of the upper sealing cover.

[0011] The inner sealing cover is located inside the upper sealing cover. The inner sealing cover is in the shape of an inverted disc. The bottom end of the inner sealing cover is against the inner ring of the top end of the casing head. The top end of the inner sealing cover is open for the screw-type lifting assembly to pass through. The top end of the inner sealing cover is integrally installed on the upper sealing cover through the outer ring plate.

[0012] Preferably, a sealing ring is installed at the center position of the top end of the upper sealing cover, and the sealing ring is sleeved on the spiral lifting assembly.

[0013] Preferably, the screw lifting assembly comprises:

[0014] A fixed cross frame, which is installed on the top of the two upper fixed frames;

[0015] A rotating screw rod is mounted on a fixed horizontal frame;

[0016] The lifting screw sleeve is sleeved on the rotating screw rod, the top of the lifting screw sleeve is symmetrically installed with a supporting cross arm, the supporting cross arm is installed with a limited sliding sleeve away from the end of the lifting screw sleeve, the limited sliding sleeve is sleeved on the upper fixed frame, the lifting screw sleeve is sequentially penetrated with an upper sealing cover and an inner sealing cover, and is inserted into the casing head;

[0017] The lower mounting stud is connected to the bottom end of the lifting screw sleeve, and the lower sealing component is detachably mounted on the lower mounting stud.

[0018] Preferably, the lower sealing assembly comprises:

[0019] A lower sealing cover, the cover end of which is buckled on the bottom end of the casing head, and a central hole is provided at the bottom end of the lower sealing cover for the lower mounting stud to pass through;

[0020] A sealing gasket layer, wherein the sealing gasket layer is installed in the lower sealing cover;

[0021] The fixing screw block is screwed onto the lower mounting stud to lock the lower sealing cover.

[0022] Preferably, a centering component adapted to the inner ring of the inner sealing cover is installed on the lifting screw sleeve, and the centering component includes:

[0023] A fixed ring seat is installed on the lifting screw sleeve. Four flip plates are distributed circumferentially on the fixed ring seat. The flip plates are bent at an obtuse angle. The bent section of the flip plate is rotatably installed on the fixed ring seat through a fixed rotating shaft. The top end of the flip plate is against the inner ring of the inner sealing cover, and the bottom end of the flip plate is against the inner wall of the casing head and is set away from the top screw.

[0024] Preferably, the inner ring of the inner sealing cover is equipped with an annular sealing block, the thickness of which gradually becomes thicker near the bottom end of the inner sealing cover, and an extrusion block for extruding the annular sealing block is installed on the flip plate. Under the extrusion of the extrusion plate, the thickness of the annular sealing block becomes thinner and flows toward the bottom end of the inner sealing cover.

[0025] Preferably, a soft rubber pad is installed at the bottom end of the upper fixing frame.

[0026] Preferably, the extrusion plate is configured as an arc-shaped plate structure.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention provides a casing head sealing test device, in which the upper sealing component and the lower sealing component both apply force to the top and bottom of the casing head in both directions, thereby reducing the casing head tilt and improving the stability of the top of the casing head. The casing head to be tested is hoisted on the lower placement rack, so that the bottom end of the casing head is in a suspended state, and then the upper fixing frame is erected on the top of the casing head. At this time, the upper sealing component installed on the upper fixing frame is blocked at the top of the casing head. During the process of the upper fixing frame being erected on the top of the casing head, the screw-type lifting component passes through the casing head, and the lower sealing component is installed on the spiral lifting component. The bolt-type lifting component works, driving the lower sealing component installed thereon to lift up. The lower sealing component is blocked at the top of the casing head and drives the casing head to lift up. Because the upper fixing frame is against the top of the top of the casing head to prevent the casing head from lifting up, the lower sealing component reversely pulls the upper fixing frame and the upper sealing component installed on the upper fixing frame through the spiral lifting component. Both the upper sealing assembly and the lower sealing assembly apply force bidirectionally to the top and bottom ends of the casing head.

[0029] (2) The present invention provides a casing head sealing test device. When the rotating screw is manually rotated, the lifting screw sleeve sleeved on the rotating screw sleeve drives the lower sealing cover to perform a lifting action, and the fixed ring seat installed on the lifting screw sleeve performs a lifting action synchronously, thereby driving the four flip plates circumferentially distributed on the fixed ring seat to perform a lifting action. As shown in the figure, when the top end of the flip plate abuts against the inner ring of the inner sealing cover, as the lifting screw sleeve continues to be lifted, because the inner sealing cover is in an inverted disc shape, the top end diameter of the inner sealing cover is smaller than the bottom end diameter of the inner sealing cover, thereby causing the top end of the flip plate to flip toward the lifting screw sleeve. On the contrary, the bottom end of the flip plate flips toward the direction away from the lifting screw sleeve and gradually abuts against the inner wall of the casing head. The four flip plates and the four top The threads are distributed in an avoidance manner, that is, each flip plate is located between two adjacent top threads, so that when the bottom end of the flip plate is against the inner wall of the casing head, there will be no movement interference with the top threads, and when the top ends of the four flip plates are against the casing head, the lower sealing cover has not yet blocked the bottom end of the casing head, and can continue to be lifted together with the flip plate as the rotating screw rotates, and when the top ends of the four flip plates are against the casing head, the lifting screw sleeve can be well found in the casing head. When the lifting sleeve is located at the center line position of the casing head, the upper sealing cover and the inner sealing cover are timely adjusted to the center, thus ensuring that the upper sealing assembly and the lower sealing assembly can both completely center the top and bottom ends of the casing head in a two-way force manner, eliminating the possibility of the casing head tilting. The sealing element of the sealing ring is then pressed against the sealing surface of the casing head, and the sealing surface of the casing head is pressed against the sealing surface of the casing head, thereby improving the sealing performance of the connection between the inner sealing cover and the top of the casing head. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is the appearance diagram of the present invention;

[0032] Figure 2 The cross-sectional view of the present invention Figure 1 (When the screw lift assembly is not working);

[0033] Figure 3 The cross-sectional view of the present invention Figure 2 (When the screw lifting assembly is in the first working state);

[0034] Figure 4 The cross-sectional view of the present invention Figure 3 (When the screw lifting assembly is in the second working state);

[0035] Figure 5 This is an outline view of the screw type lifting assembly of the present invention.

[0036] In the figure: 10. Lower placing rack; 11. Casing head; 12. Upper fixing rack; 13. Upper sealing assembly; 14. Lower sealing assembly; 15. Screw-type lifting assembly; 16. Upper sealing cover; 17. Inner sealing cover; 18. Outer ring plate; 19. Sealing ring; 20. Fixed cross frame; 21. Rotating screw; 22. Lifting screw sleeve; 23. Support cross arm; 24. Limiting sleeve; 25. Lower mounting stud; 26. Lower sealing cover; 27. Sealing pad; 28. Fixed screw block; 29. ​​Fixed ring seat; 30. Flip plate; 31. Top screw; 32. Annular sealing block; 33. Extrusion block; 34. Soft rubber pad. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] like Figures 1 to 5 As shown, this embodiment provides a casing head sealing test device, comprising:

[0041] A lower rack 10, on which a casing head 11 is mounted;

[0042] An upper fixing frame 12, wherein two symmetrically arranged upper fixing frames 12 are mounted on the top of the casing head 11;

[0043] An upper sealing assembly 13, which is mounted on two upper fixing frames 12 and is used to seal the top of the casing head 11;

[0044] The lower sealing assembly 14 is used to seal the top of the casing head 11. The lower sealing assembly 14 is installed on the two upper fixing frames 12 through a screw-type lifting assembly 15. The lower sealing assembly 14 and the upper sealing assembly 13 apply force in both directions.

[0045] The working principle and beneficial effects of the above technical solution are:

[0046] The present invention provides a casing head sealing test device, wherein the casing head 11 to be tested is hoisted on the lower placement frame 10, so that the bottom end of the casing head 11 is in a suspended state, and then the upper fixing frame 12 is erected on the top of the casing head 11. At this time, the upper sealing component 13 installed on the upper fixing frame 12 is blocked on the top of the casing head 11. During the process of the upper fixing frame 12 being erected on the top of the casing head 11, the screw-type lifting component 15 passes through the casing head 11, and the lower sealing component 14 is installed on the screw lifting component 15. The bolt-type lifting component 15 works to drive The lower sealing assembly 14 installed thereon performs an upward lifting action, and the lower sealing assembly 14 blocks the top of the casing head 11, and drives the casing head 11 to perform an upward lifting action. Because the upper fixing frame 12 is against the top of the casing head 11 to prevent the casing head 11 from lifting up, the lower sealing assembly 14 reversely pulls the upper fixing frame 12 and the upper sealing assembly 13 installed on the upper fixing frame 12 through the spiral lifting assembly 15, and the upper sealing assembly 13 and the lower sealing assembly 14 both apply force to the top and bottom of the casing head 11 in both directions, thereby improving the stability of the top of the casing head 11. The present invention discloses a casing head sealing test device, in which the upper sealing assembly 13 and the lower sealing assembly 14 both apply force to the top and bottom of the casing head 11 in both directions, thereby reducing the casing head tilt and improving the sealing of the casing head 11.

[0047] In one embodiment, the upper sealing assembly 13 comprises:

[0048] The upper sealing cover 16 is slidably mounted on the two upper fixing frames 12 and is arranged close to the bottom end of the upper fixing frames 12. The cover end of the upper sealing cover 16 is buckled on the top end of the casing head 11. The screw-type lifting assembly 15 passes through the top center position of the upper sealing cover 16.

[0049] The inner sealing cover 17 is located inside the upper sealing cover 16. The inner sealing cover 17 is in an inverted disc shape. The bottom end of the inner sealing cover 17 is against the top inner ring of the casing head 11. The top end of the inner sealing cover 17 is open for the screw-type lifting assembly 15 to pass through. The top end of the inner sealing cover 17 is integrally mounted on the upper sealing cover 16 through the outer ring plate 18.

[0050] The working principle and beneficial effects of the above technical solution are:

[0051] The upper sealing assembly 13 includes an upper sealing cover 16 and an inner sealing cover 17. The bottom end of the inner sealing cover 17 is against the top inner ring of the casing head 11, and the cover end of the upper sealing cover 16 is buckled on the top of the casing head 11. The two realize a double-layer seal at the top of the casing head 11 to improve the sealing performance of the upper sealing assembly.

[0052] In one embodiment, a sealing ring 19 is installed at the center of the top end of the upper sealing cover 16 , and the sealing ring 19 is sleeved on the spiral lifting assembly 15 .

[0053] The beneficial effects of the above technical solution are:

[0054] The provision of the sealing ring 19 improves the sealing performance between the spiral lifting assembly 15 and the upper sealing cover 16 .

[0055] In one embodiment, the screw lift assembly 15 comprises:

[0056] A fixed cross frame 20, which is mounted on the top of the two upper fixed frames 12;

[0057] Rotate the screw 21, which is mounted on the fixed horizontal frame 20;

[0058] The lifting screw sleeve 22 is sleeved on the rotating screw rod 21. The top of the lifting screw sleeve 22 is symmetrically installed with a support cross arm 23. The support cross arm 23 is installed with a limited sliding sleeve 24 away from the end of the lifting screw sleeve 22. The limited sliding sleeve 24 is sleeved on the upper fixed frame 12. The lifting screw sleeve 22 is sequentially penetrated by the upper sealing cover 16 and the inner sealing cover 17, and is inserted into the casing head 11;

[0059] The lower mounting stud 25 is connected to the bottom end of the lifting screw sleeve 22 , and the lower sealing assembly 14 is detachably mounted on the lower mounting stud 25 .

[0060] The working principle and beneficial effects of the above technical solution are:

[0061] When the upper fixing frame 12 is mounted on the top of the casing head 11, the upper sealing assembly 13 is blocked at the top of the casing head 11, the rotating screw 21 is connected to the upper fixing frame 12 through the fixed cross frame 20, and the lifting screw sleeve 22 sleeved on the rotating screw 21 passes through the casing head 11, and the lower sealing assembly 14 is manually fixed to the lower mounting stud 25. Then, the rotating screw 21 is rotated, and the rotating screw 21 drives the lifting screw sleeve 22 sleeved thereon, the supporting cross arm 23 connected to the lifting screw sleeve 22, and the limiting sliding sleeve 24 installed on the supporting cross arm 23 to slide upward along the upper fixing frame 12, thereby driving the lower sealing assembly 14 installed on the lower mounting stud 25 to do an upward lifting action, and the lower sealing assembly 14 is blocked at the top of the casing head 11. Because the upper fixing frame 12 is against the top of the casing head 11 to prevent the lower sealing assembly 14 from driving the casing head 11 to lift up, the lower sealing assembly 14 reversely pulls the upper fixing frame 12 and the upper sealing cover 16 and the inner sealing cover 17 installed on the upper fixing frame 12 through the spiral lifting assembly 15. The upper sealing cover 16, the inner sealing cover 17 and the lower sealing assembly 14 apply force to the top and bottom ends of the casing head 11 in both directions, thereby improving the sealing performance of the casing head 11.

[0062] In one embodiment, the lower seal assembly 14 includes:

[0063] A lower sealing cover 26, the cover end of the lower sealing cover 26 is buckled on the bottom end of the casing head 11, and a central hole is opened at the bottom end of the lower sealing cover 26 for the lower mounting stud 25 to pass through;

[0064] A sealing gasket layer 27, the sealing gasket layer 27 is installed in the lower sealing cover 26;

[0065] The fixing screw block 28 is screwed onto the lower mounting stud 25 to lock the lower sealing cover 26 .

[0066] The working principle and beneficial effects of the above technical solution are:

[0067] The lifting screw sleeve 22 sleeved on the rotating screw 21 passes through the casing head 11, and the lower sealing cover 26 is manually inserted into the lower mounting stud 25 from the center hole, and then the fixing screw block 28 is fastened on the lower mounting stud 25. The fixing screw block 28 locks the lower sealing cover 26 to the end of the lifting screw sleeve 22 close to the lower mounting stud 25. In this way, when the rotating screw 21 is manually rotated, the lower sealing cover 26 is lifted, and the cover end of the lower sealing cover 26 is buckled on the bottom end of the casing head 11, and the sealing pad layer 27 is sandwiched between the bottom end of the casing head 11 and the cover end of the lower sealing cover 26, so as to improve the sealing performance. The sealing pad layer 27 is a rubber layer.

[0068] In one embodiment, a centering assembly adapted to the inner ring of the inner sealing cover 17 is installed on the lifting screw sleeve 22, and the centering assembly includes:

[0069] The fixed ring seat 29 is installed on the lifting screw sleeve 22. Four flip plates 30 are distributed circumferentially on the fixed ring seat 29. The flip plates 30 are bent at an obtuse angle. The bent section of the flip plate 30 is rotatably installed on the fixed ring seat 29 through a fixed rotating shaft. The top end of the flip plate 30 is against the inner ring of the inner sealing cover 17, and the bottom end of the flip plate 30 is against the inner wall of the casing head 11, and is set away from the top screw 31.

[0070] The working principle and beneficial effects of the above technical solution are:

[0071] When the rotating screw 21 is manually rotated, the lifting screw sleeve 22 sleeved on the rotating screw 21 drives the lower sealing cover 26 to lift up, and the fixed ring seat 29 installed on the lifting screw sleeve 22 is lifted up synchronously, thereby driving the four flip plates 30 circumferentially distributed on the fixed ring seat 29 to lift up. Figure 3As shown, when the top end of the flip plate 30 is against the inner circle of the inner sealing cover 17, as the lifting screw sleeve 22 continues to rise, because the inner sealing cover 17 is in an inverted disc shape, the top diameter of the inner sealing cover 17 is smaller than the bottom diameter of the inner sealing cover 17, so that the top end of the flip plate 30 is flipped in the direction close to the lifting screw sleeve 22, on the contrary, the bottom end of the flip plate 30 is flipped in the direction away from the lifting screw sleeve 22, and gradually against the inner wall of the casing head 11, the four flip plates 30 and the four top screws 31 are distributed in an avoidance manner, that is, each flip plate 30 is located between two adjacent top screws 31, so that when the bottom end of the flip plate 30 is against the inner wall of the casing head 11, it will not come into contact with the top screws 31 When the top ends of the four flip plates 30 are against the casing head 11, the lower sealing cover 26 has not yet blocked the bottom end of the casing head 11, and can continue to be lifted together with the flip plate 30 as the rotating screw 21 rotates. When the top ends of the four flip plates 30 are against the casing head 11, the lifting screw sleeve 22 can be well centered in the casing head 11. When the lifting sleeve 22 is located at the center line position of the casing head 11, the upper sealing cover 16 and the inner sealing cover 17 are timely adjusted to the center, thereby ensuring that the upper sealing assembly 13 and the lower sealing assembly 14 can both be completely centered at the top and bottom ends of the casing head 11 in both directions, eliminating the possibility of the casing head tilting.

[0072] In one embodiment, an annular sealing block 32 is installed on the inner ring of the inner sealing cover 17, and the thickness of the annular sealing block 32 is gradually thickened near the bottom end of the inner sealing cover 17. An extrusion block 33 for extruding the annular sealing block 32 is installed on the flip plate 30. Under the extrusion of the extrusion plate 33, the thickness of the annular sealing block 32 becomes thinner and flows toward the bottom end of the inner sealing cover 17.

[0073] The working principle and beneficial effects of the above technical solution are:

[0074] As the rotating screw 21 continues to rotate, the flip plate 30 and the lower sealing cover 26 continue to rise. When the lower sealing cover 26 completely blocks the bottom end of the casing head 11, the bottom end of the flip plate 30 detaches from the inner wall of the casing head 11 and drives the extrusion block 33 to squeeze the annular sealing block 32 located on the inner ring of the inner sealing cover 17. During the process of the thicker part of the annular sealing block 32 being squeezed and thinned, it flows toward the bottom end of the inner sealing cover 17 to seal the bottom end of the inner sealing cover 17 and the top inner ring of the casing head 11, thereby improving the sealing of the connection between the inner sealing cover 17 and the top of the casing head 11.

[0075] In one embodiment, a soft rubber pad 34 is installed at the bottom end of the upper fixing frame 12 .

[0076] In one embodiment, the extrusion plate 33 is configured as an arc-shaped plate structure.

[0077] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A casing head sealing test device, characterized in that: include: A lower rack (10), on which the casing head (11) is mounted; An upper fixing frame (12), wherein two symmetrically arranged upper fixing frames (12) are mounted on the top of the casing head (11); An upper sealing assembly (13), the upper sealing assembly (13) is mounted on the two upper fixing frames (12), and the upper sealing assembly (13) is used to seal the top end of the casing head (11); The lower sealing assembly (14) is used to seal the top end of the casing head (11). The lower sealing assembly (14) is installed on two upper fixing frames (12) through a screw-type lifting assembly (15). The lower sealing assembly (14) and the upper sealing assembly (13) apply force in both directions.

2. A casing head sealing test device according to claim 1, characterized in that: The upper sealing assembly (13) comprises: an upper sealing cover (16) slidably mounted on the two upper fixing frames (12) and arranged close to the bottom end of the upper fixing frames (12); a cover end of the upper sealing cover (16) is buckled on the top end of the casing head (11); a screw-type lifting assembly (15) is passed through the top center position of the upper sealing cover (16); an inner sealing cover (17) is located inside the upper sealing cover (16); the inner sealing cover (17) is arranged in an inverted disc shape; the bottom end of the inner sealing cover (17) is abutted against the top inner ring of the casing head (11); the top end of the inner sealing cover (17) is arranged in an open type so as to allow the screw-type lifting assembly (15) to pass through; the top end of the inner sealing cover (17) is integrally mounted on the upper sealing cover (16) through an outer ring plate (18).

3. A casing head sealing test device according to claim 2, characterized in that: A sealing ring (19) is installed at the center of the top end of the upper sealing cover (16), and the sealing ring (19) is sleeved on the spiral lifting component (15).

4. A casing head sealing test device according to claim 2, characterized in that: The screw-type lifting assembly (15) comprises: a fixed cross frame (20) mounted on the top of two upper fixed frames (12); a rotating screw (21) mounted on the fixed cross frame (20); a lifting screw sleeve (22) sleeved on the rotating screw (21); a supporting cross arm (23) symmetrically mounted on the top of the lifting screw sleeve (22); a limiting sliding sleeve (24) mounted on the end of the supporting cross arm (23) away from the lifting screw sleeve (22); the limiting sliding sleeve (24) sleeved on the upper fixed frame (12); the lifting screw sleeve (22) sequentially penetrates an upper sealing cover (16) and an inner sealing cover (17) and penetrates into a casing head (11); a lower mounting stud (25) is connected to the bottom end of the lifting screw sleeve (22); and a lower sealing assembly (14) is detachably mounted on the lower mounting stud (25).

5. A casing head sealing test device according to claim 4, characterized in that: The lower sealing assembly (14) comprises: a lower sealing cover (26), a sealing pad layer (27) and a fixing screw block (28); the cover end of the lower sealing cover (26) is buckled on the bottom end of the casing head (11); the bottom end of the lower sealing cover (26) is provided with a central hole for facilitating the penetration of a lower mounting stud (25); the sealing pad layer (27) is installed in the lower sealing cover (26); and the fixing screw block (28) is screwed onto the lower mounting stud (25) to lock the lower sealing cover (26).

6. A casing head sealing test device according to claim 4, characterized in that: A centering component adapted to the inner ring of the inner sealing cover (17) is installed on the lifting screw sleeve (22), and the centering component comprises: a fixed ring seat (29) installed on the lifting screw sleeve (22), four flip plates (30) are distributed circumferentially on the fixed ring seat (29), the flip plates (30) are bent at an obtuse angle, and the bent section of the flip plate (30) is rotatably installed on the fixed ring seat (29) through a fixed rotating shaft, the top end of the flip plate (30) is against the inner ring of the inner sealing cover (17), and the bottom end of the flip plate (30) is against the inner wall of the casing head (11) and is arranged to avoid the top screw (31).

7. A casing head sealing test device according to claim 6, characterized in that: An annular sealing block (32) is installed on the inner ring of the inner sealing cover (17). The thickness of the annular sealing block (32) gradually becomes thicker near the bottom end of the inner sealing cover (17). An extrusion block (33) for extruding the annular sealing block (32) is installed on the flip plate (30). Under the extrusion of the extrusion plate (33), the thickness of the annular sealing block (32) becomes thinner and flows toward the bottom end of the inner sealing cover (17).

8. A casing head sealing test device according to claim 1, characterized in that: A soft rubber pad (34) is installed at the bottom end of the upper fixing frame (12).

9. A casing head sealing test device according to claim 7, characterized in that: The extrusion plate (33) is configured as an arc-shaped plate structure.

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