Impact-resistant casing head sealing assembly

Abstract

The invention relates to the technical field of casing heads, in particular to an impact-resistant casing head sealing assembly which comprises a casing body, and a lower pressing ring is fixedly arranged at the lower end of the inner wall of the casing body; the hanger is arranged in the middle of an inner cavity of the casing pipe body and is concentric with the casing pipe body, an annular boss is fixedly arranged on the outer side wall of the hanger, and a flexible sealing gasket is arranged on the outer side of the annular boss. An upper pressing ring is fixedly arranged on the lower surface of the pressing flange, and a second fillet is arranged at the joint of the upper pressing ring and the pressing flange. The sealing device has the beneficial effects that the flexible sealing gasket is arranged on the outer side of the annular boss, the upper side and the lower side of the flexible sealing gasket are bent towards the hanger and are fixedly bonded to the outer side wall of the hanger, and after the pressing flange is fixedly connected with the sleeve body, the upper side and the lower side of the flexible sealing gasket are pressed by the second fillet and the first fillet correspondingly, so that the sealing effect is achieved; and meanwhile, by means of incompressibility of hydraulic oil, impact borne by the device can be buffered, and sealing is prevented from being affected.

Description

Technical Field

[0001] The invention relates to the technical field of casing heads, in particular to an impact-resistant casing head sealing component. Background Art

[0002] The casing head is used to fix the wellhead of the drilled 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, and provide a transition connection for the installation of the blowout preventer, tubing head, and Christmas tree.

[0003] A Chinese invention with publication number CN117489291B discloses a casing head with a compression seal structure, which is provided with a compression seal structure based on a sealing rubber sleeve and a disc spring, will not be damaged during the assembly process, and has a stronger pressure bearing capacity.

[0004] However, currently, the impact air pressure generated in the casing and the vibration of the casing itself will impact the sealing ring on the inner wall of the casing head, causing the sealing ring to be squeezed and damaged, affecting the sealing effect. Therefore, the present invention proposes an impact-resistant casing head sealing assembly to solve the above problem. Summary of the invention

[0005] The object of the present invention is to provide an impact-resistant casing head sealing assembly to solve the problem of poor impact resistance of the conventional casing head mentioned in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an impact-resistant casing head sealing assembly, comprising:

[0007] A sleeve body, wherein a lower pressure ring is fixedly arranged at the lower end of the inner wall of the sleeve body, and a fillet 1 is arranged at the connection between the lower pressure ring and the sleeve body;

[0008] A hanger, the hanger is arranged in the middle of the inner cavity of the casing body and is concentric with the casing body, an annular boss is fixedly arranged on the outer wall of the hanger, a flexible sealing gasket is arranged on the outer side of the annular boss, the middle of the inner wall of the flexible sealing gasket is in contact with the annular boss, the upper and lower sides of the flexible sealing gasket are bent toward the hanger and fixed to the outer wall of the hanger, the inner cavity of the flexible sealing gasket is filled with hydraulic oil, and a through hole is formed through the surface of the annular boss and is connected to the upper and lower inner cavities of the flexible sealing gasket;

[0009] A clamping flange is fixedly installed on the upper end of the sleeve body by bolts, an upper pressure ring is fixedly arranged on the lower surface of the clamping flange, and a second fillet is arranged at the connection between the upper pressure ring and the clamping flange, and the second fillet and the first fillet are respectively pressed on the upper and lower bending parts of the flexible sealing gasket.

[0010] Preferably, hard pressure rings are bonded and fixed to inner walls of upper and lower bending parts of the flexible sealing pad, and the hard pressure rings are made of metal material.

[0011] Preferably, the cross-section of the hard pressure ring is in the shape of an arc, the central angle and radius of the arcs of the hard pressure ring, the first fillet and the second fillet are all consistent, and a plurality of through holes are provided and distributed in a ring array.

[0012] Preferably, an annular groove is formed on the outer side wall of the annular boss, and a side pressure ring adapted thereto is provided in the inner cavity of the annular groove, and the middle portion of the flexible sealing gasket is located between the annular boss and the side pressure ring and is pressed by both.

[0013] Preferably, an annular groove is provided in the middle of the inner wall of the sleeve body, and a buffer is provided in the inner cavity of the annular groove, a limiting groove corresponding to the buffer is provided on the surface of the side pressure ring, and chamfers are provided on the upper and lower edges of the side pressure ring.

[0014] Preferably, the buffer is arranged in an annular structure and has a cross section of multiple "W" shapes. The buffer is made of a hard material that can undergo elastic deformation. A buffer pad is bonded and fixed to the inner wall of the bend of the buffer.

[0015] Preferably, a deformation groove is provided in the middle of the surface of the buffer pad, and the deformation groove is annular and has an arc-shaped cross section.

[0016] Preferably, bonding grooves are provided at both upper and lower ends of the outer side wall of the hanger, and the upper and lower side edges of the flexible sealing pad are respectively inserted into the inner cavities of the two bonding grooves and bonded and fixed thereto.

[0017] Preferably, a casing groove 1 is opened at the bottom of the inner wall of the casing body and an outer casing is fixedly installed thereon, a casing groove 2 is opened at the lower end of the inner side wall of the hanger and an inner casing is fixedly installed thereon, the inner casing and the outer casing are concentric with a gap therebetween.

[0018] Preferably, a connecting flange is fixedly provided at the upper end of the sleeve body, a second annular groove is opened on the surface of the connecting flange, and an annular gasket is bonded and fixed to the inner cavity of the second annular groove, and the annular gasket is placed between the clamping flange and the connecting flange and is pressed downward by the clamping flange.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a flexible sealing gasket on the outer side of the annular boss, and the upper and lower sides of the flexible sealing gasket are bent toward the hanger and bonded and fixed to the outer wall of the hanger. The inner wall of the casing body and the inner wall of the clamping flange are respectively provided with fillet one and fillet two. A through hole is opened through the surface of the annular boss for connecting the hydraulic oil in the upper and lower inner cavities of the flexible sealing gasket. After the clamping flange is fixedly connected to the casing body, the fillet two and fillet one respectively press the upper and lower sides of the flexible sealing gasket to achieve a sealing effect. At the same time, with the help of the incompressibility of the hydraulic oil, the impact on the device can be buffered to avoid affecting the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a half-section schematic diagram of the overall structure of the present invention;

[0023] Figure 3 A half-section schematic diagram of the hanger structure of the present invention;

[0024] Figure 4 It is an exploded schematic diagram of the clamping flange and the main structure of the sleeve of the present invention;

[0025] Figure 5 A half-section schematic diagram of the flexible sealing pad structure of the present invention;

[0026] Figure 6 It is a half-section schematic diagram of the buffer structure of the present invention.

[0027] In the figure: 1. casing body; 11. connecting flange; 12. lower pressure ring; 13. fillet one; 14. annular groove one; 15. annular groove two; 16. annular pad; 17. casing groove one; 2. hanger; 21. annular boss; 22. annular groove; 23. through hole; 24. bonding groove; 25. casing groove two; 3. clamping flange; 31. upper pressure ring; 32. fillet two; 4. flexible sealing gasket; 41. hard pressure ring; 5. side pressure ring; 51. limit groove; 52. chamfer; 6. buffer; 61. buffer pad; 62. deformation groove; 7. outer casing; 8. inner casing. DETAILED DESCRIPTION

[0028] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit 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.

[0029] See also Figures 1 to 6 , the present invention provides a technical solution:

[0030] Embodiment 1, an impact-resistant casing head sealing assembly, comprises: a casing body 1, a hanger 2 and a clamping flange 3.

[0031] Specifically, a casing groove 17 is opened at the bottom of the inner wall of the casing body 1 and an outer casing 7 is fixedly installed. A casing groove 25 is opened at the lower end of the inner wall of the hanger 2 and an inner casing 8 is fixedly installed. The inner casing 8 is concentric with the outer casing 7 and a gap is left between the two. Figure 1 and Figure 2 As shown, after the casing body 1 and the hanger 2 are installed and positioned, the outer casing 7 and the inner casing 8 can be positioned. The outer casing 7 and the casing body 1, as well as the inner casing 8 and the hanger 2 are fixed by threaded plugging, and the compressed rubber pad ensures the sealing of the two. A sealing structure is provided between the casing body 1 and the hanger 2 to seal the gap between the outer casing 7 and the inner casing 8. The sealing structure is as follows:

[0032] First, a lower pressure ring 12 is fixedly arranged at the lower end of the inner wall of the sleeve body 1, and a fillet 13 is arranged at the connection between the lower pressure ring 12 and the sleeve body 1;

[0033] Secondly, the hanger 2 is arranged in the middle of the inner cavity of the casing body 1 and is concentric with the casing body 1. An annular boss 21 is fixedly arranged in the middle of the outer wall of the hanger 2. A flexible sealing pad 4 is arranged on the outer side of the annular boss 21. The middle of the inner wall of the flexible sealing pad 4 is in contact with the annular boss 21. The upper and lower sides of the flexible sealing pad 4 are bent toward the hanger 2 and fixed to the outer wall of the hanger 2. The inner cavity of the flexible sealing pad 4 is filled with hydraulic oil, such as Figure 2 As shown, a cavity is formed between the flexible sealing pad 4 and the outer side wall of the hanger 2, and the annular boss 21 divides the cavity into two parts, the annular boss 21 has a through hole 23 extending through the surface thereof and connecting the upper and lower inner cavities of the flexible sealing pad 4, and a plurality of through holes 23 are provided and distributed in an annular array. When the volume of the upper and lower inner cavities of the flexible sealing pad 4 changes, the hydraulic oil can pass through the through hole 23 and exchange in the upper and lower inner cavities. Therefore, the device can improve the sealing performance by increasing the degree of compression of the flexible sealing pad 4.

[0034] Furthermore, the clamping flange 3 is fixedly installed on the upper end of the casing body 1 by bolts, and an upper compression ring 31 is fixedly provided on the lower surface of the clamping flange 3, and a fillet 2 32 is provided at the connection between the upper compression ring 31 and the clamping flange 3, and the fillet 2 32 and the fillet 1 13 are respectively pressed on the upper and lower bending parts of the flexible sealing gasket 4. When the clamping flange 3 approaches the casing body 1 from top to bottom, the upper compression ring 31 gradually enters the gap between the casing body 1 and the hanger 2, and at this time, the fillet 2 32 corresponds to the upper side of the flexible sealing gasket 4. As the clamping flange 3 approaches the casing body 1, the fillet 2 32 can compress the upper side of the flexible sealing gasket 4, and at the same time, the lower side of the flexible sealing gasket 4 is pressed on the inner wall of the fillet 1 13, as shown in FIG. Figure 2 As shown, the hanger 2 and the casing body 1 are sealed by the fit between the lower side of the flexible sealing pad 4 and the fillet 13, and the hanger 2 and the clamping flange 3 are sealed by the fit between the upper side of the flexible sealing pad 4 and the fillet 2 32, and at this time, the hydraulic oil inside the flexible sealing pad 4 is under pressure, thereby avoiding the contraction of the flexible sealing pad 4 and causing the overall sealing of the device to be reduced. In addition, when the device is impacted or vibrated, the hanger 2 can be displaced a small distance in the vertical direction for buffering, and with the displacement of the hanger 2, the hydraulic oil will pass through the inner cavity of the through hole 23 for up and down exchange. Based on the viscosity of the hydraulic oil itself and the small aperture of the through hole 23, the hydraulic oil can produce a damping effect on the movement of the hanger 2, thereby absorbing the impact and vibration of the device, thereby achieving buffering and shock absorption effects.

[0035] In order to improve the compression and fitting effect of the fillet 13 and the fillet 2 32 on the flexible sealing gasket 4, the present application also has hard pressure rings 41 bonded and fixed to the inner walls of the upper and lower bending parts of the flexible sealing gasket 4. The hard pressure ring 41 is made of metal material, and the cross-section of the hard pressure ring 41 is arc-shaped. The center angle and radius of the arcs of the hard pressure ring 41, the fillet 13 and the fillet 2 32 are consistent. Figure 5 As shown, the provision of the hard pressure ring 41 can improve the strength of the bending part of the flexible sealing gasket 4, and ensure that the flexible sealing gasket 4 fits more closely with the fillet 13, and the flexible sealing gasket 4 fits more closely with the fillet 2 32, without reducing the sealing performance due to local shrinkage deformation of the flexible sealing gasket 4.

[0036] In order to laterally compress the flexible sealing gasket 4, the present application also has an annular groove 22 on the outer wall of the annular boss 21, and the inner cavity of the annular groove 22 is provided with a side pressure ring 5 adapted thereto, and the middle part of the flexible sealing gasket 4 is located between the annular boss 21 and the side pressure ring 5 and is compressed by both. The cooperation of the side pressure ring 5 and the annular groove 22 can compress the flexible sealing gasket 4, ensuring that the annular boss 21 can separate the space between the flexible sealing gasket 4 and the hanger 2 into two parts, and the space of these two parts is only kept connected by the through hole 23.

[0037] In order to prevent the hanger 2 from shaking, the present application also has an annular groove 14 in the middle of the inner wall of the casing body 1, and a buffer 6 is provided in the inner cavity of the annular groove 14, and a limiting groove 51 corresponding to the buffer 6 is provided on the surface of the side pressure ring 5. When the hanger 2 is installed in the inner cavity of the casing body 1, the side pressure ring 5 can just correspond to the buffer 6, and the buffer 6 will support the side pressure ring 5 to prevent the hanger 2 from shaking in the horizontal direction. Chamfers 52 are provided on the upper and lower edges of the side pressure ring 5 to prevent the buffer 6 from obstructing the side pressure ring 5 and affecting the overall installation of the hanger 2.

[0038] In order to further improve the impact resistance of the device, the present application also has a buffer member 6 that is arranged in an annular structure and has a multi-segment "W"-shaped cross section. The buffer member 6 is made of a hard material that can undergo elastic deformation. A buffer pad 61 is bonded and fixed to the inner wall of the bending part of the buffer member 6. A deformation groove 62 is opened in the middle of the surface of the buffer pad 61. The deformation groove 62 is annular and has an arc-shaped cross section. Figure 6 As shown, the buffer 6 itself can undergo a certain degree of elastic deformation, and the provision of the buffer pad 61 and the deformation groove 62 can enhance the strength and elastic deformation capacity of the buffer 6, thereby improving the positioning effect of the buffer 6 on the side pressure ring 5, and after the buffer 6 is against the side pressure ring 5, it can absorb and reduce the impact and vibration transmitted from the hanger 2, thereby further improving the impact resistance of the device.

[0039] In order to fix the edge of the flexible sealing pad 4 to the hanger 2, the present application also has bonding grooves 24 on the upper and lower ends of the outer wall of the hanger 2. The upper and lower edges of the flexible sealing pad 4 are respectively inserted into the inner cavities of the two bonding grooves 24 and bonded and fixed thereto. The edge of the flexible sealing pad 4 is embedded in the inner cavity of the bonding groove 24, which can maintain a more stable connection with the hanger 2.

[0040] In order to buffer the vibration between the clamping flange 3 and the casing body 1, the present application also has a connecting flange 11 fixedly arranged at the upper end of the casing body 1, a ring groove 15 is opened on the surface of the connecting flange 11, and a ring gasket 16 is bonded and fixed to the inner cavity of the ring groove 15, and the ring gasket 16 is cushioned between the clamping flange 3 and the connecting flange 11 and is pressed downward by the clamping flange 3, such as Figure 4 As shown, the annular gasket 16 can buffer the vibration between the casing body 1 and the clamping flange 3 , and the annular gasket 16 can also improve the sealing between the casing body 1 and the clamping flange 3 .

[0041] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An impact-resistant casing head sealing assembly, characterized in that: include: A sleeve body (1), wherein a lower pressure ring (12) is fixedly provided at the lower end of the inner wall of the sleeve body (1), and a fillet (13) is provided at the connection between the lower pressure ring (12) and the sleeve body (1); A hanger (2), the hanger (2) being arranged in the middle of the inner cavity of the casing body (1) and being concentric with the casing body (1), the outer wall of the hanger (2) being fixedly provided with an annular boss (21), the outer side of the annular boss (21) being provided with a flexible sealing pad (4), the middle of the inner wall of the flexible sealing pad (4) being in contact with the annular boss (21), the upper and lower sides of the flexible sealing pad (4) being bent toward the hanger (2) and being fixed to the outer wall of the hanger (2), the inner cavity of the flexible sealing pad (4) being filled with hydraulic oil, the surface of the annular boss (21) being provided with a through hole (23) which is connected to the upper and lower inner cavities of the flexible sealing pad (4); A clamping flange (3), the clamping flange (3) is fixedly installed on the upper end of the sleeve body (1) by bolts, an upper pressure ring (31) is fixedly arranged on the lower surface of the clamping flange (3), and a second rounded corner (32) is arranged at the connection between the upper pressure ring (31) and the clamping flange (3), and the second rounded corner (32) and the first rounded corner (13) are respectively pressed on the upper and lower bending parts of the flexible sealing gasket (4).

2. The impact-resistant casing head sealing assembly according to claim 1, characterized in that: Hard pressure rings (41) are bonded and fixed to the inner walls of the upper and lower bending parts of the flexible sealing pad (4), and the hard pressure rings (41) are made of metal material.

3. The impact-resistant casing head sealing assembly according to claim 2, characterized in that: The cross section of the hard pressure ring (41) is in the shape of an arc, the center angle and radius of the arc lines of the hard pressure ring (41), the first fillet (13) and the second fillet (32) are all consistent, and a plurality of through holes (23) are provided and distributed in a ring array.

4. The impact-resistant casing head sealing assembly according to claim 3, characterized in that: The outer wall of the annular boss (21) is provided with an annular groove (22), the inner cavity of the annular groove (22) is provided with a side pressure ring (5) adapted thereto, and the middle portion of the flexible sealing pad (4) is located between the annular boss (21) and the side pressure ring (5) and is pressed by both.

5. The impact-resistant casing head sealing assembly according to claim 4, characterized in that: An annular groove (14) is provided in the middle of the inner wall of the sleeve body (1), and a buffer component (6) is provided in the inner cavity of the annular groove (14); a limiting groove (51) corresponding to the buffer component (6) is provided on the surface of the side pressure ring (5); and chamfers (52) are provided on the upper and lower edges of the side pressure ring (5).

6. The impact-resistant casing head sealing assembly according to claim 5, characterized in that: The buffer (6) is arranged in an annular structure and has a cross section of a multi-segment "W" shape. The buffer (6) is made of a hard material that can undergo elastic deformation. A buffer pad (61) is bonded and fixed to the inner wall of the bend of the buffer (6).

7. The impact-resistant casing head sealing assembly according to claim 6, characterized in that: A deformation groove (62) is provided in the middle of the surface of the buffer pad (61); the deformation groove (62) is annular and has an arc-shaped cross section.

8. The impact-resistant casing head sealing assembly according to claim 7, characterized in that: The upper and lower ends of the outer wall of the hanger (2) are provided with bonding grooves (24), and the upper and lower side edges of the flexible sealing pad (4) are respectively inserted into the inner cavities of the two bonding grooves (24) and bonded and fixed thereto.

9. The impact-resistant casing head sealing assembly according to claim 8, characterized in that: The bottom of the inner wall of the casing body (1) is provided with a casing groove 1 (17) and an outer casing (7) is fixedly installed thereon; the lower end of the inner wall of the hanger (2) is provided with a casing groove 2 (25) and an inner casing (8) is fixedly installed thereon; the inner casing (8) and the outer casing (7) are concentric with a gap between them.

10. The impact-resistant casing head sealing assembly according to claim 9, characterized in that: A connecting flange (11) is fixedly provided at the upper end of the sleeve body (1), a second annular groove (15) is provided on the surface of the connecting flange (11), and an annular gasket (16) is bonded and fixed to the inner cavity of the second annular groove (15), and the annular gasket (16) is cushioned between the clamping flange (3) and the connecting flange (11) and is clamped downward by the clamping flange (3).

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