Wellhead device

Abstract

The application provides a wellhead device, which comprises a body, a load ring, a casing hanger, a tubing hanger and a sealing assembly, the body has a mounting channel, the load ring is arranged on the inner wall surface of the mounting channel, the casing hanger is arranged in the interior of the mounting channel and is mounted on the load ring, the tubing hanger is arranged in the interior of the mounting channel and is located above the casing hanger along the axial direction of the body, the sealing assembly comprises a first metal sealing ring and a second metal sealing ring which are arranged in abutment along the axial direction of the body, the first metal sealing ring and the second metal sealing ring are both sleeved on the tubing hanger and are in sealing cooperation with the inner peripheral surface of the mounting channel and the outer peripheral surface of the tubing hanger, and at least a part of the first metal sealing ring is located outside the second metal sealing ring and forms a first sealing cavity. The wellhead device provided by the application can solve the problem of sealing failure of the existing wellhead device and leakage caused thereby through the cooperative action of the first metal sealing ring and the second metal sealing ring.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and more specifically, to a wellhead device. Background Technology

[0002] Wellhead equipment is a crucial piece of equipment in oil and gas extraction systems. Its installation efficiency, operational safety, and reliability directly determine the production efficiency and cost control of field operations. As oil and gas exploration and development moves towards deep wells, ultra-deep wells, and complex marine environments, the working conditions faced by wellhead equipment are becoming increasingly demanding. Traditional wellhead equipment typically employs modular assembly methods, resulting in a cumbersome and time-consuming installation process with high precision requirements for on-site connection, posing significant safety hazards. To address these issues, the industry has proposed quick-installation wellhead equipment that rapidly connects the casing hanger and wellhead guide pipe, aiming to simplify the installation process, reduce labor intensity, and improve operational safety.

[0003] However, existing quick-installation wellhead devices still have significant technical defects in practical applications, mainly in the risk of seal failure. Seal failure can lead to leakage, which is a major safety risk in the high-pressure environment of deep and ultra-deep wells. Once it occurs, it is often difficult to repair effectively without interrupting production, thus affecting the operation of the wellhead device.

[0004] As can be seen from the above, the wellhead device in the existing technology has the problem of leakage due to sealing failure. Summary of the Invention

[0005] The main objective of this invention is to provide a wellhead device to solve the problem of leakage caused by sealing failure in existing wellhead devices.

[0006] To achieve the above objectives, according to one aspect of the present invention, a wellhead device is provided, comprising a body, a load-bearing ring, a casing hanger, a tubing hanger, and a sealing assembly. The body has an installation channel, the load-bearing ring is disposed on the inner wall of the installation channel, the casing hanger is disposed inside the installation channel and installed on the load-bearing ring, the tubing hanger is disposed inside the installation channel and located above the casing hanger along the axial direction of the body, and the sealing assembly includes a first metal sealing ring and a second metal sealing ring abutting against each other along the axial direction of the body. Both the first metal sealing ring and the second metal sealing ring are sleeved on the tubing hanger and sealingly engage with the inner circumferential surface of the installation channel and the outer circumferential surface of the tubing hanger. At least a portion of the first metal sealing ring is located outside the second metal sealing ring, and an annular first sealing cavity is formed between the first metal sealing ring and the second metal sealing ring, located on the outer circumference of the second metal sealing ring.

[0007] Furthermore, the first metal sealing ring includes a first part and a second part arranged along the axial direction of the body. The first part is sleeved on the tubing hanger and seals with the outer peripheral surface of the tubing hanger. The outer peripheral surface of the second part seals with the inner peripheral surface of the installation channel. The inner peripheral surface of the second part is spaced apart from the tubing hanger to form a first gap. The second metal sealing ring includes a first segment and a second segment arranged along the axial direction of the body. The first segment is sleeved on the tubing hanger and seals with the outer peripheral surface of the tubing hanger. The first segment is located in the first gap and abuts against the bottom of the first part. The outer peripheral surface of the second segment seals with the inner peripheral surface of the installation channel. The bottom of the second part abuts against the second segment. A first sealing cavity is formed between the inner peripheral surface of the second part and the outer peripheral surface of the first segment.

[0008] Furthermore, the bottom of the first part has a first annular groove, the first segment has a first protrusion located in the first annular groove, and the first protrusion abuts against the inner wall surface of the first annular groove; the second segment has a second annular groove, and the second part extends into the inner wall of the second annular groove and abuts against the inner wall surface of the second annular groove.

[0009] Furthermore, the sealing assembly also includes a retaining ring having a body portion and a first protrusion portion disposed on the body portion. The body portion is sleeved on the tubing hanger. The outer peripheral surface of the first portion and the inner peripheral surface of the mounting channel are spaced apart to form a second gap. The first protrusion portion extends into the second gap and abuts against the second portion. The first portion abuts against the body portion. A second sealing cavity is formed between the inner peripheral surface of the first protrusion portion and the outer peripheral surface of the first portion.

[0010] Furthermore, the top surface of the second part has a third annular groove, the end of the first protrusion extends into the third annular groove and abuts against the inner wall surface of the third annular groove; the bottom surface of the main body has a fourth annular groove, the top surface of the first part has a second protrusion extending into the fourth annular groove, and the second protrusion abuts against the inner wall surface of the fourth annular groove.

[0011] Furthermore, the bearing ring also has a second protrusion disposed on the body portion, the second protrusion extending toward the side away from the first metal sealing ring, and the inner circumferential surface of the second protrusion being spaced apart from the outer circumferential surface of the tubing hanger; the sealing assembly also includes an inner retaining ring, a combined sleeve, and a connecting ring, the inner retaining ring being sleeved on the tubing hanger, and a fourth gap being formed between the outer circumferential surface of the inner retaining ring and the inner wall surface of the second protrusion, the combined sleeve being sleeved on the tubing hanger, a portion of the combined sleeve being located in the fourth gap, an annular mounting groove being formed between the outer wall surface of the combined sleeve and the inner wall surface of the second protrusion, and the connecting ring being disposed in the annular mounting groove.

[0012] Furthermore, an outer retaining ring is provided on the outer circumferential surface of the combined sleeve, and an annular groove is provided on the inner wall surface of the installation channel, with at least a portion of the outer retaining ring located in the annular groove.

[0013] Furthermore, the sealing assembly also includes a support ring, which is sleeved on the tubing hanger. Along the axial direction of the body, the bottom end of the second section abuts against the top surface of the support ring; the inner circumferential surface of the second section is spaced apart from the outer circumferential surface of the tubing hanger; the support ring has an annular first protruding arm that abuts between the inner circumferential surface of the second section and the outer circumferential surface of the tubing hanger; the bottom surface of the first section has a fifth annular groove, and the end of the annular first protruding arm extends into the fifth annular groove and abuts against the inner wall surface of the fifth annular groove.

[0014] Furthermore, the wellhead device also includes a sealing sleeve and a retaining ring. The sealing sleeve is fitted onto the casing hanger, and the outer circumferential surface of the sealing sleeve is in sealing fit with the inner circumferential surface of the installation channel. The tubing hanger abuts against the top surface of the sealing sleeve, and the sealing sleeve is fixedly connected to the body by the retaining ring.

[0015] Furthermore, the wellhead assembly also includes a flange, a gasket, a clamp, and a sealing ring. The flange is positioned above the body, the gasket is placed between the flange and the body, the clamp is fitted around the outside of the body and the flange, and the body and the flange are connected by the clamp. A portion of the tubing hanger extends into the interior of the flange, and the sealing ring is positioned between the outer circumferential surface of the tubing hanger and the inner circumferential surface of the flange.

[0016] According to the technical solution of the present invention, the wellhead device includes a body, a load-bearing ring, a casing hanger, a tubing hanger, and a sealing assembly. The body has an installation channel. The load-bearing ring is disposed on the inner wall of the installation channel. The casing hanger is disposed inside the installation channel and installed on the load-bearing ring. The tubing hanger is disposed inside the installation channel and located above the casing hanger along the axial direction of the body. The sealing assembly includes a first metal sealing ring and a second metal sealing ring that abut against each other along the axial direction of the body. Both the first metal sealing ring and the second metal sealing ring are sleeved on the tubing hanger and are sealed to the inner circumferential surface of the installation channel and the outer circumferential surface of the tubing hanger. At least a portion of the first metal sealing ring is located outside the second metal sealing ring. An annular first sealing cavity located on the outer circumference of the second metal sealing ring is formed between the first metal sealing ring and the second metal sealing ring.

[0017] As can be seen from the above, the wellhead device of this application adopts the synergistic effect of the first metal sealing ring and the second metal sealing ring arranged in an axial abutment configuration to form a double sealing ring. The first metal sealing ring and the second metal sealing ring provide two sealing surfaces, realizing the redundancy backup of the sealing function. Even if one sealing surface has a micro-leakage due to impurity intrusion or slight wear, the other sealing surface can still maintain the overall sealing integrity, thereby improving the sealing performance of the overall structure and the safety of use.

[0018] This application forms a sandwich-like first sealing cavity between a first metal sealing ring and a second metal sealing ring. Complex pressure fluctuations within the well cause abnormal pressure increases between the two sealing surfaces provided by the first and second metal sealing rings. The annular first sealing cavity of this application can limit the pressure within it. This structural design prevents leakage and instability of the first and second metal sealing rings, avoids sealing failure, and further ensures the overall sealing performance.

[0019] This application strengthens the installation strength of the casing hanger by setting a load-bearing ring on the inner wall of the channel of the main body, and the casing hanger is mounted on the load-bearing ring, thereby improving the load-bearing capacity of the main body for the casing hanger and ensuring the structural stability of the wellhead device. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of the overall structure of the wellhead device of the present invention is shown;

[0022] Figure 2 A cross-sectional view of the sealing assembly of the present invention is shown;

[0023] Figure 3 Show Figure 2 Enlarged view of point A in the image.

[0024] The above figures include the following reference numerals:

[0025] 10. Body; 20. Load-bearing ring; 30. Casing hanger; 40. Tubing hanger; 50. Sealing assembly; 501. First sealing cavity; 502. Second sealing cavity; 510. Support ring; 520. First metal sealing ring; 530. Second metal sealing ring; 540. Bearing ring; 541. Body part; 542. First extension; 543. Second extension; 550. Inner retaining ring; 560. Combined sleeve; 570. Connecting ring; 580. Outer retaining ring; 60. Base; 70. Connector; 80. Sealing sleeve; 90. Manual gate valve; 100. Threaded flange; 110. Pressure switch; 120. Pressure gauge; 130. Flange; 140. Clamp; 150. Sealing gasket; 160. Sealing ring; 170. Through-type stop valve; 180. Grease injection test valve; 190. Snap ring; 200. Wellhead guide tube. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0029] To address the problem of leakage caused by sealing failure in existing wellhead devices, this application provides a wellhead device for improving the sealing performance and stability of the structure.

[0030] like Figure 1 As shown, the wellhead device includes a body 10, a load-bearing ring 20, a casing hanger 30, a tubing hanger 40, and a sealing assembly 50. The body 10 has an installation channel. The load-bearing ring 20 is disposed on the inner wall of the installation channel. The casing hanger 30 is disposed inside the installation channel and installed on the load-bearing ring 20. The tubing hanger 40 is disposed inside the installation channel and is located above the casing hanger 30 along the axial direction of the body 10.

[0031] The main body 10 is a sleeve structure. The load-bearing ring 20, casing hanger 30, tubing hanger 40 and sealing assembly 50 are all located inside the main body 10. The load-bearing ring 20 is fixedly installed on the inner wall of the installation channel provided by the main body 10. The casing hanger 30 is mounted on the load-bearing ring 20 to achieve the positioning and installation of the casing hanger 30. The casing hanger 30 is installed on the main body 10 through the load-bearing ring 20.

[0032] This application strengthens the installation strength of the casing hanger 30 by setting a load-bearing ring 20 on the inner wall of the channel of the main body 10, and the casing hanger 30 is mounted on the load-bearing ring 20, thereby improving the load-bearing capacity of the main body 10 on the casing hanger 30 and ensuring the structural stability of the wellhead device.

[0033] In this embodiment, the sealing assembly 50 includes at least a first metal sealing ring 520 and a second metal sealing ring 530. The first metal sealing ring 520 and the second metal sealing ring 530 are sleeved on the tubing hanger 40, and the tubing hanger 40 is sealed to the body 10 through the first metal sealing ring 520 and the second metal sealing ring 530.

[0034] The wellhead device of this application adopts a first metal sealing ring 520 and a second metal sealing ring 530 arranged axially to form a synergistic effect of double sealing rings. The first metal sealing ring 520 and the second metal sealing ring 530 provide two sealing surfaces, realizing redundant backup of the sealing function. Even if one sealing surface has a micro-leakage due to impurity intrusion or slight wear, the other sealing surface can still maintain the overall sealing integrity, improving the sealing performance of the overall structure and the safety of use.

[0035] Along the axial direction of the body 10, the first metal sealing ring 520 is located above the second metal sealing ring 530.

[0036] Specifically, the first metal sealing ring 520 and the second metal sealing ring 530 are abutting each other along the axial direction of the body 10. The first metal sealing ring 520 and the second metal sealing ring 530 are both sleeved on the tubing hanger 40 and are sealed to the inner circumferential surface of the installation channel and the outer circumferential surface of the tubing hanger 40. At least a portion of the first metal sealing ring 520 is located outside the second metal sealing ring 530. An annular first sealing cavity 501 located on the outer circumference of the second metal sealing ring 530 is formed between the first metal sealing ring 520 and the second metal sealing ring 530.

[0037] This application forms a first sealing cavity 501 sandwiched between the first metal sealing ring 520 and the second metal sealing ring 530. Complex pressure fluctuations within the well cause abnormal pressure increases between the two sealing surfaces provided by the first metal sealing ring 520 and the second metal sealing ring 530. The annular first sealing cavity 501 of this application can limit the pressure inside. This structural design prevents the first metal sealing ring 520 and the second metal sealing ring 530 from being damaged or unstable, avoiding the problem of sealing failure and further ensuring the sealing performance of the overall structure.

[0038] In this embodiment, the first metal sealing ring 520 and the second metal sealing ring 530 cooperate to form an annular first sealing cavity 501 on the outer periphery of the second metal sealing ring 530, so that the first metal sealing ring 520 and the second metal sealing ring 530 form a structural constraint in the radial direction, thereby improving the structural strength of the first metal sealing ring 520 and the second metal sealing ring 530.

[0039] like Figures 1 to 3 As shown, the first metal sealing ring 520 includes a first part and a second part arranged along the axial direction of the body 10. The first part is sleeved on the tubing hanger 40 and seals with the outer peripheral surface of the tubing hanger 40. The outer peripheral surface of the second part seals with the inner peripheral surface of the installation channel. The inner peripheral surface of the second part is spaced apart from the tubing hanger 40 to form a first gap.

[0040] Both the first and second parts are ring structures, and the first and second parts are integrally formed.

[0041] Specifically, along the axial direction of the body 10, the first part is located above the second part. The first part provides a first sealing surface that fits against the tubing hanger 40. The second part is spaced apart from the tubing hanger 40 to form a second sealing surface that fits against the body 10. The first metal sealing ring 520 achieves a sealing fit between the tubing hanger 40 and the body 10 through the first sealing surface and the second sealing surface.

[0042] The second metal sealing ring 530 includes a first section and a second section arranged along the axial direction of the body 10. The first section is sleeved on the tubing hanger 40 and seals with the outer peripheral surface of the tubing hanger 40. The first section is located in the first gap and abuts against the bottom of the first part. The outer peripheral surface of the second section seals with the inner peripheral surface of the installation channel. The bottom of the second part abuts against the second section.

[0043] Both the first and second segments are ring structures, and the first and second segments are integrally formed.

[0044] Specifically, along the axial direction of the body 10, the first section is located above the second section. The first section provides a third sealing surface that fits against the tubing hanger 40. The second section is spaced apart from the tubing hanger 40 to form a fourth sealing surface that fits against the body 10. The second metal sealing ring 530 achieves a sealing fit between the tubing hanger 40 and the body 10 through the third and fourth sealing surfaces.

[0045] In this embodiment, the first segment abuts against the bottom of the first part, and the second part is located outside the first segment and abuts against the second segment, thereby forming an annular first sealing cavity 501 between the inner circumferential surface of the second part and the outer circumferential surface of the first segment. The first segment and the first part, the second segment and the second part of this application are formed to abut against each other axially, so that the first metal sealing ring 520 and the second metal sealing ring 530 can not only ensure sealing, but also work together to form structural constraints, thereby improving the stability of the structure installation.

[0046] Specifically, the bottom of the first part has a first annular groove, and the first section has a first protrusion located in the first annular groove. The first protrusion abuts against the inner wall of the first annular groove. The first protrusion and the first annular groove form a plug-in and sealing structure. The groove wall of the first annular groove has the function of radially limiting the first protrusion, so that the first metal sealing ring 520 and the second metal sealing ring 530 are radially limited, further improving the structural strength of the linkage between the first metal sealing ring 520 and the second metal sealing ring 530.

[0047] Specifically, the second section has a second annular groove, and the second part extends into the inner wall of the second annular groove and abuts against the inner wall surface of the second annular groove. The second part and the second annular groove form a structure that is inserted and abuts to seal. The groove wall of the second annular groove has the function of radially limiting the second part, so that the first metal sealing ring 520 and the second metal sealing ring 530 are radially limited, further improving the structural strength of the linkage between the first metal sealing ring 520 and the second metal sealing ring 530.

[0048] The first metal sealing ring 520 of this application radially limits the second metal sealing ring 530 through the first ring groove, and the second metal sealing ring 530 radially limits the first metal sealing ring 520 through the second ring groove, thereby forming a mutually limiting structure between the first metal sealing ring 520 and the second metal sealing ring 530.

[0049] like Figures 1 to 3 As shown, the sealing assembly 50 also includes a retaining ring 540, which has a body portion 541 and a first extension portion 542 disposed on the body portion 541. The body portion 541 is sleeved on the tubing hanger 40.

[0050] The first protrusion 542 is an annular structure spaced apart from the outer peripheral surface of the tubing hanger 40.

[0051] Specifically, the outer peripheral surface of the first part and the inner peripheral surface of the mounting channel are spaced apart to form a second gap, the first protrusion 542 extends into the second gap and abuts against the second part, and a second sealing cavity 502 is formed between the inner peripheral surface of the first protrusion 542 and the outer peripheral surface of the first part.

[0052] In this embodiment, the first protrusion 542 of the bearing ring 540 abuts against the second part of the first metal sealing ring 520, and the first part abuts against the body part 541, thereby forming a second sealing cavity 502 between the first protrusion 542 and the first part. The first sealing cavity 501 is suitable for use when a pressure difference is formed between the first metal sealing ring 520 and the bearing ring 540. The second sealing cavity 502 can limit the pressure inside. This structural arrangement prevents leakage and instability of the first metal sealing ring 520 and the bearing ring 540, avoids the problem of sealing failure, and further ensures the sealing performance of the overall structure.

[0053] In this embodiment, along the axial direction of the body 10, the first sealing cavity 501 is located below the second sealing cavity 502. The combination of the two sealing cavities in this application ensures the sealing stability of the sealing surfaces provided by the first metal sealing ring 520 and the second metal sealing ring 530, avoiding the problem of sealing failure caused by pressure difference in different regions along the axial direction.

[0054] Specifically, the top surface of the second part is formed with a third annular groove. The end of the first protrusion 542 extends into the third annular groove and abuts against the inner wall surface of the third annular groove. The first protrusion 542 extends into the inner wall of the third annular groove and abuts against the inner wall surface of the third annular groove. The first protrusion 542 and the third annular groove form a plug-in fit and abutment sealing structure. The groove wall of the third annular groove has the function of radially limiting the first protrusion 542, so that the first metal sealing ring 520 and the bearing ring 540 are radially limited, further improving the structural strength of the linkage between the first metal sealing ring 520 and the bearing ring 540.

[0055] Specifically, the bottom surface of the main body 541 has a fourth annular groove, and the top surface of the first part has a second protrusion extending into the fourth annular groove. The second protrusion abuts against the inner wall surface of the fourth annular groove. The second protrusion and the fourth annular groove form a plug-in fit and abutment seal structure. The groove wall of the fourth annular groove has the function of radially limiting the second protrusion, so that the first metal sealing ring 520 and the bearing ring 540 are radially limited, further improving the structural strength of the linkage between the first metal sealing ring 520 and the bearing ring 540.

[0056] The first metal sealing ring 520 of this application radially limits the bearing ring 540 through the third ring groove, and the bearing ring 540 radially limits the first metal sealing ring 520 through the fourth ring groove, thereby forming a mutually limiting structure between the first metal sealing ring 520 and the bearing ring 540.

[0057] In this embodiment, the first metal sealing ring 520, the second metal sealing ring 530, and the support ring 540 form a mutually cooperating structural arrangement, which enables the first metal sealing ring 520, the second metal sealing ring 530, and the support ring 540 to form radial constraints, thereby improving the stability of the overall structure; at the same time, it also restricts the radial deformation of the first metal sealing ring 520 and the second metal sealing ring 530, thereby ensuring the sealing effect of the first metal sealing ring 520 and the second metal sealing ring 530.

[0058] like Figures 1 to 3 As shown, the sealing assembly 50 also includes an inner retaining ring 550, a combined sleeve 560, a connecting ring 570, and an outer retaining ring 580, with the inner retaining ring 550 sleeved on the tubing hanger 40.

[0059] Specifically, the bearing ring 540 also has a second extension 543 provided on the body portion 541. The second extension 543 extends toward the side away from the first metal sealing ring 520, and the inner circumferential surface of the second extension 543 is spaced apart from the outer circumferential surface of the oil pipe hanger 40.

[0060] A fourth gap is formed between the outer peripheral surface of the inner retaining ring 550 and the inner wall surface of the second protrusion 543. The combined sleeve 560 is sleeved on the oil pipe hanger 40, a part of the combined sleeve 560 is located in the fourth gap, and an annular mounting groove is formed between the outer wall surface of the combined sleeve 560 and the inner wall surface of the second protrusion 543. The connecting ring 570 is disposed in the annular mounting groove.

[0061] Specifically, both the combined sleeve 560 and the second extension 543 have annular grooves, and the two annular grooves cooperate to form an annular mounting groove.

[0062] In this embodiment, the second protrusion 543 cooperates with the inner retaining ring 550 to form an annular fourth gap. The fourth gap is configured to radially limit the joint sleeve 560, thereby improving the stability of the joint sleeve 560 during installation. At the same time, this application utilizes a connecting ring 570 between the joint sleeve 560 and the second protrusion 543 to form the joint sleeve 560, the connecting ring 570 and the second protrusion 543 into a structural whole, thereby improving the stability of the structure.

[0063] In this embodiment, an outer retaining ring 580 is provided on the outer peripheral surface of the combined sleeve 560, and an annular groove is provided on the inner wall surface of the installation channel. At least a portion of the outer retaining ring 580 is located in the annular groove. This application achieves a fixed connection with the body 10 through the outer retaining ring 580. The axial limiting is achieved through the setting of the annular groove and the outer retaining ring 580, thereby avoiding the problem of axial movement of the sealing assembly 50 and ensuring the stability of the installation of the sealing assembly 50.

[0064] like Figure 1 As shown, the wellhead device also includes a sealing sleeve 80 and a retaining ring 190. The sealing sleeve 80 is fitted onto the casing hanger 30. The outer circumferential surface of the sealing sleeve 80 is sealed to the inner circumferential surface of the installation channel. The tubing hanger 40 abuts against the top surface of the sealing sleeve 80. The sealing sleeve 80 is fixedly connected to the body 10 by the retaining ring 190.

[0065] The sealing sleeve 80 and the snap ring 190 are both located inside the body 10.

[0066] This application achieves a fixed connection between the sealing sleeve 80 and the body 10 through the structural setting of the snap ring 190, and uses the sealing sleeve 80 to achieve a sealing fit between the sleeve hanger 30 and the body 10, thereby improving the sealing performance between the sleeve hanger 30 and the body 10.

[0067] In this embodiment, multiple casing hangers 30 can be configured, with the multiple casing hangers 30 arranged axially along the body 10. The casing hangers 30, sealing sleeves 80, and snap rings 190 are arranged in a one-to-one correspondence, that is, each casing hanger 30 is provided with a sealing sleeve 80, and each sealing sleeve 80 is fixedly connected to the body 10 by a snap ring 190. Among them, the tubing hanger 40 is disposed above the multiple casing hangers 30 and abuts against the top surface of the uppermost sealing sleeve 80 among the multiple sealing sleeves 80.

[0068] like Figures 1 to 3 As shown, the sealing assembly 50 also includes a support ring 510, which is sleeved on the tubing hanger 40. Along the axial direction of the body 10, the bottom end of the second section abuts against the top surface of the support ring 510.

[0069] Among them, the support ring 510 has the function of axially supporting the second metal sealing ring 530.

[0070] Specifically, the support ring 510 abuts against the sealing sleeve 80.

[0071] In this embodiment, the inner circumferential surface of the second segment is spaced apart from the outer circumferential surface of the tubing hanger 40. The support ring 510 has an annular first protruding arm that abuts against the inner circumferential surface of the second segment and the outer circumferential surface of the tubing hanger 40. The bottom surface of the first segment has a fifth annular groove, and the end of the annular first protruding arm extends into the fifth annular groove and abuts against the inner wall surface of the fifth annular groove. The first protruding arm is positioned between the inner circumferential surface of the second segment and the outer circumferential surface of the tubing hanger 40 to achieve a radial abutment structure, and the fifth annular groove of the first segment of the second metal sealing ring 530 forms a radial limit with the first protruding arm. The support ring 510 of this application forms an axial support for the second metal sealing ring 530, while the support ring 510 and the second metal sealing ring 530 form a radial limit structure, improving the structural stability of the sealing assembly 50 and ensuring the overall sealing performance of the sealing assembly 50.

[0072] In this embodiment, the sealing assembly 50 includes a combined sleeve 560, an outer retaining ring 580, a bearing ring 540, a connecting ring 570, an inner retaining ring 550, a first metal sealing ring 520, a second metal sealing ring 530, and a support ring. During installation and use, it is assembled on the tubing hanger 40 in the following order: The second metal sealing ring 530 is installed on the upper part of the support ring; the first metal sealing ring 520 is installed on the upper part of the second metal sealing ring 530; the bearing ring 540 is installed on the upper part of the first metal sealing ring 520; the inner retaining ring 550 is installed on the upper part of the bearing ring 540; the combined sleeve 560 is installed on the upper part of the inner retaining ring 550; the combined sleeve 560 and the bearing ring 540 are connected by a connecting ring 570; and the outer retaining ring 580 is provided on the outside of the combined sleeve 560. During field use, the outer retaining ring 580 is snapped into place with the main body 10.

[0073] like Figure 1 As shown, the wellhead device also includes a flange 130, a sealing gasket 150, a clamp 140, and a sealing ring 160. The flange 130 is located above the body 10, the sealing gasket 150 is placed between the flange 130 and the body 10, the clamp 140 is fitted around the outside of the body 10 and the flange 130, and the body 10 and the flange 130 are connected by the clamp 140. A part of the tubing hanger 40 extends into the interior of the flange 130, and the sealing ring 160 is located between the outer circumferential surface of the tubing hanger 40 and the inner circumferential surface of the flange 130.

[0074] Both the sealing gasket 150 and the sealing ring 160 are made of rubber. The sealing gasket 150 is used for sealing the connection between the flange 130 and the body 10, and the sealing ring 160 is used for sealing the connection between the oil pipe hanger 40 and the flange 130.

[0075] In this embodiment, the clamp 140 is provided with a set screw assembly for locking the clamp 140.

[0076] Specifically, the top of the body 10 is machined into a flange 130 with a flange protrusion. The outer ring of the flange 130 has an annular flange 130 groove. The clamp 140 adopts a split clamp 140 structure (such as two semi-circular clamps 140), with a protrusion on the inner side that matches the flange 130 groove. The two ends of the clamp 140 are detachably connected to the body 10 and flange 130 of the wellhead device (including but not limited to hinge connection, threaded connection, and snap-fit ​​connection), realizing quick opening and closing. Multiple set screw assemblies are evenly distributed on the outside of the clamp 140. The end of the set screw assembly is a conical pressure head. When screwed in, the pressure head presses against the outer surface of the clamp 140, forcing the protrusion to tightly engage with the flange 130 groove. By adopting the clamp 140 type quick connector, this application can reduce the disassembly and assembly of the blowout preventer during drilling, reduce drilling time, improve operating efficiency, and improve device stability.

[0077] Furthermore, the top screw assembly is a mechanical component in the wellhead device used for precise positioning, fixing and sealing of key components. It includes structures such as the top screw body 10, thrust bearing assembly, sealing gland and adjusting nut. In this embodiment, it ensures stable fit between the clamp 140 and the flange 130 and the body 10 by applying a controllable axial force.

[0078] In this embodiment, the wellhead device also includes a base 60, which is welded to the wellhead guide tube 200. The body 10 is connected to the base 60 through a connector 70, which may be a bolt, a connecting disc assembly, or other structural component.

[0079] In this embodiment, both the base 60 and the body 10 are equipped with manual gate valves 90. The manual gate valves 90 are connected to pressure gauges 120 via threaded flanges 100. Pressure gauges 120 are equipped with pressure switches 110. The body 10 is equipped with multiple through-type shut-off valves 170 for wellhead pipeline crossing. The outer walls of the base 60 and the body 10 are equipped with grease injection pressure testing valves 180 for sealing pressure testing.

[0080] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0081] The wellhead device of this application adopts a first metal sealing ring 520 and a second metal sealing ring 530 arranged axially to form a synergistic effect of double sealing rings. The first metal sealing ring 520 and the second metal sealing ring 530 provide two sealing surfaces, realizing redundant backup of the sealing function. Even if one sealing surface has a micro-leakage due to impurity intrusion or slight wear, the other sealing surface can still maintain the overall sealing integrity, improving the sealing performance of the overall structure and the safety of use.

[0082] This application forms a first sealing cavity 501 sandwiched between the first metal sealing ring 520 and the second metal sealing ring 530. Complex pressure fluctuations within the well cause abnormal pressure increases between the two sealing surfaces provided by the first metal sealing ring 520 and the second metal sealing ring 530. The annular first sealing cavity 501 of this application can limit the pressure inside. This structural design prevents leakage or instability of the first metal sealing ring 520 and the second metal sealing ring 530, avoids sealing failure, and further ensures the sealing performance of the overall structure.

[0083] This application strengthens the installation strength of the casing hanger 30 by setting a load-bearing ring 20 on the inner wall of the channel of the main body 10, and the casing hanger 30 is mounted on the load-bearing ring 20, thereby improving the load-bearing capacity of the main body 10 on the casing hanger 30 and ensuring the structural stability of the wellhead device.

[0084] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0085] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0086] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wellhead device, characterized in that, include: Body (10), the body (10) having an installation channel; A load-bearing ring (20) is disposed on the inner wall surface of the installation channel; A sleeve hanger (30) is disposed inside the installation channel and installed on the load-bearing ring (20). The tubing hanger (40) is disposed inside the installation channel and is located above the casing hanger (30) along the axial direction of the body (10); A sealing assembly (50) includes a first metal sealing ring (520) and a second metal sealing ring (530) that are axially abutted against the body (10). The first metal sealing ring (520) and the second metal sealing ring (530) are both sleeved on the tubing hanger (40) and sealed with the inner circumferential surface of the installation channel and the outer circumferential surface of the tubing hanger (40). At least a portion of the first metal sealing ring (520) is located outside the second metal sealing ring (530). An annular first sealing cavity (501) located on the outer circumference of the second metal sealing ring (530) is formed between the first metal sealing ring (520) and the second metal sealing ring (530). The first metal sealing ring (520) includes a first part and a second part arranged along the axial direction of the body (10). The first part is sleeved on the tubing hanger (40) and seals with the outer peripheral surface of the tubing hanger (40). The outer peripheral surface of the second part seals with the inner peripheral surface of the mounting channel. The inner peripheral surface of the second part is spaced apart from the tubing hanger (40) to form a first gap. The second metal sealing ring (530) includes a first segment and a second segment arranged along the axial direction of the body (10). The first segment is sleeved on the tubing hanger (40) and seals with the outer peripheral surface of the tubing hanger (40). The first segment is located in the first gap and abuts against the bottom of the first part. The outer peripheral surface of the second segment seals with the inner peripheral surface of the mounting channel. The bottom of the second part abuts against the second segment. The first sealing cavity (501) is formed between the inner circumferential surface of the second part and the outer circumferential surface of the first section. The bottom of the first part has a first annular groove, and the first segment has a first protrusion located in the first annular groove, the first protrusion abutting against the inner wall surface of the first annular groove; The second segment has a second annular groove, and the second portion extends into the inner wall of the second annular groove and abuts against the inner wall surface of the second annular groove.

2. The wellhead device according to claim 1, characterized in that, The sealing assembly (50) further includes: The support ring (540) has a body part (541) and a first extension part (542) provided on the body part (541), and the body part (541) is sleeved on the oil pipe hanger (40). The outer peripheral surface of the first part is spaced apart from the inner peripheral surface of the mounting channel to form a second gap. The first protrusion (542) extends into the second gap and abuts against the second part. The first part abuts against the body part (541). A second sealing cavity (502) is formed between the inner peripheral surface of the first protrusion (542) and the outer peripheral surface of the first part.

3. The wellhead device according to claim 2, characterized in that, The top surface of the second part is formed with a third annular groove, and the end of the first protrusion (542) extends into the third annular groove and abuts against the inner wall surface of the third annular groove; The bottom surface of the body part (541) has a fourth annular groove, and the top surface of the first part has a second protrusion extending into the fourth annular groove, the second protrusion abutting against the inner wall surface of the fourth annular groove.

4. The wellhead device according to claim 2, characterized in that, The receiving ring (540) also has a second protrusion (543) disposed on the body portion (541), the second protrusion (543) protruding toward the side away from the first metal sealing ring (520), the inner circumferential surface of the second protrusion (543) being spaced apart from the outer circumferential surface of the oil pipe hanger (40), and the sealing assembly (50) further includes: An inner retaining ring (550) is fitted onto the tubing hanger (40), and a fourth gap is formed between the outer peripheral surface of the inner retaining ring (550) and the inner wall surface of the second protrusion (543). A combined sleeve (560) is fitted onto the tubing hanger (40), and a portion of the combined sleeve (560) is located in the fourth gap; The connecting ring (570) has an annular mounting groove formed between the outer wall surface of the combined sleeve (560) and the inner wall surface of the second protrusion (543), and the connecting ring (570) is disposed in the annular mounting groove.

5. The wellhead device according to claim 4, characterized in that, An outer retaining ring (580) is provided on the outer peripheral surface of the combined sleeve (560), and an annular groove is provided on the inner wall surface of the installation channel, with at least a portion of the outer retaining ring (580) located in the annular groove.

6. The wellhead device according to claim 1, characterized in that, The sealing assembly (50) further includes: Support ring (510), the support ring (510) is sleeved on the oil pipe hanger (40), along the axial direction of the body (10), the bottom end of the second section abuts against the top surface of the support ring (510); The inner circumferential surface of the second segment is spaced apart from the outer circumferential surface of the tubing hanger (40), and the support ring (510) has an annular first protruding arm that abuts between the inner circumferential surface of the second segment and the outer circumferential surface of the tubing hanger (40). The bottom surface of the first segment has a fifth annular groove, and the end of the annular first protruding arm extends into the fifth annular groove and abuts against the inner wall surface of the fifth annular groove.

7. The wellhead device according to claim 1, characterized in that, The wellhead device also includes: A sealing sleeve (80) is fitted onto the casing hanger (30). The outer circumferential surface of the sealing sleeve (80) is sealed to the inner circumferential surface of the installation channel. The tubing hanger (40) abuts against the top surface of the sealing sleeve (80). A retaining ring (190) is used to fix the sealing sleeve (80) to the body (10).

8. The wellhead apparatus according to any one of claims 1 to 7, characterized in that, The wellhead device also includes: A flange (130) is disposed above the body (10); A sealing gasket ring (150) is placed between the flange (130) and the body (10); A clamp (140) is fitted around the outside of the body (10) and the flange (130), and the body (10) and the flange (130) are connected by the clamp (140); A sealing ring (160) is provided between the outer circumferential surface of the tubing hanger (40) and the inner circumferential surface of the flange (130), wherein a portion of the tubing hanger (40) extends into the interior of the flange (130).

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