Side door sealing device of ultrahigh pressure blowout preventer
By setting a double-pass sealing structure of a side end face sealing ring and an end sealing ring between the blowout preventer housing and the side door assembly, the problem of sealing leakage under ultra-high pressure is solved and a reliable long-term sealing effect is achieved.
Patent Information
- Application Number
- CN202423046571.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-12-10
AI Technical Summary
The sealing structure of existing ultra-high pressure blowout preventers is prone to leakage under high pressure environments, especially the piston and end face sealing forms cannot effectively seal when the preload force is insufficient or the deformation is large, resulting in extrusion and leakage of the sealing ring.
A side door sealing assembly is used, including a side face sealing ring and an end sealing ring. The sealing assembly is tightly attached to the blowout preventer housing through the pre-tightening force of the bolts, forming a double-line sealing barrier. The side face sealing ring and the end sealing ring complement each other to ensure no leakage under high pressure.
It achieves reliable sealing in ultra-high pressure environment and prevents leakage for a long time, thus improving the sealing performance of the blowout preventer.
Smart Images
Figure CN223398652U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of blowout prevention of well control equipment for oil field operations, in particular to a side door sealing device for an ultra-high pressure blowout preventer. Background Art
[0002] The seal between the BOP housing and the side door typically uses piston seals, rod seals, or end face seals. For ultra-high-pressure BOPs, piston and rod seals present significant elastic deformation due to the large sealing surface. This can cause the seal ring to squeeze through the deformation gap, leading to leaks.
[0003] Because the end-face seal structure requires a high preload on the side door bolts, manual tightening to the required preload is impossible. If the preload is too low, the end-face gap increases under pressure, easily squeezing out the seal ring and causing leaks. Although the sealing ring structure can effectively compensate for housing deformation, the seal ring is a single-layer seal and cannot withstand ultra-high pressures, resulting in leakage after long-term use. Utility Model Content
[0004] In view of the above-mentioned defects or shortcomings, the purpose of the present invention is to provide a side door sealing device for an ultra-high pressure blowout preventer.
[0005] In order to achieve the above objectives, the technical solution of the utility model is:
[0006] A side door sealing device for an ultra-high pressure blowout preventer comprises a side door sealing assembly installed between a blowout preventer housing and a side door assembly, wherein side contact surfaces of the side door sealing assembly, the blowout preventer housing and the side door assembly are all provided with side end face sealing rings and end end sealing rings.
[0007] The side door sealing assembly includes: a sealing ring, the end sealing rings are arranged on both sides of the sealing ring, the end sealing rings are in sealing contact with the blowout preventer housing and the side door assembly respectively, and the side end face sealing rings are installed on both sides of the sealing ring.
[0008] The circumferential edge of the sealing ring is provided with a mounting hole, and the sealing ring is fixedly connected to the blowout preventer housing or the side door assembly through the mounting hole and screws.
[0009] The sealing surface cross section of the sealing ring is a conical sealing surface, and the end sealing ring is arranged on the inclined surface of the conical sealing surface.
[0010] Mounting grooves are provided on both sides of the sealing ring, and the end sealing rings are fixedly mounted in the mounting grooves.
[0011] The side end face sealing ring is an annular sealing ring structure, and the cross section of the annular sealing ring structure is a rectangular structure.
[0012] A first boss is provided on the rectangular structure, and a mounting slot matching the first boss is provided on the blowout preventer housing and the side door assembly.
[0013] A second boss is provided at the tail of the rectangular surface of the rectangular structure, a hanging hole is provided on the side surface of the sealing ring, and the second boss is hung in the hanging hole.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] The utility model provides a side door sealing device for an ultra-high pressure blowout preventer. The side door sealing component is arranged between the blowout preventer housing and the side door assembly, and a side end face sealing ring and an end sealing ring are arranged on the side door sealing component. Under the action of the pre-tightening force of the side door bolts, the side door assembly can squeeze the side door sealing component and tightly adhere the side door sealing component to the blowout preventer housing. Under the action of the internal pressure of the blowout preventer, the end face sealing ring is squeezed outward, and the side end face sealing ring and the end sealing ring form two sealing barriers, which complement each other and are reliable in sealing. Both seals can ensure long-term sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic structural diagram of the side door sealing device of the ultra-high pressure blowout preventer of the utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the side door sealing assembly of the utility model;
[0018] Figure 3 It is a schematic diagram of the structure of the side end face sealing ring of the utility model.
[0019] In the figure, 1 is the side door assembly; 2 is the gate assembly; 3 is the blowout preventer housing; 4 is the side door sealing assembly; 5 is the mounting slot; 41 is the side end face sealing ring; 42 is the end sealing ring; 43 is the sealing ring; 411 is the first boss; 412 is the second boss; 431 is the hanging hole. DETAILED DESCRIPTION
[0020] The present invention will be described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.
[0021] like Figure 1-3As shown, the present invention provides an ultra-high-pressure blowout preventer side door sealing device. This structure effectively seals the pressure between the blowout preventer housing and the side door under ultra-high pressure, providing reliable and long-term sealing. Specifically, it includes a side door sealing assembly 4 installed between the blowout preventer housing 3 and the side door assembly 1. The side door sealing assembly 4 is fitted onto the end of the gate assembly 2. The side contact surfaces of the side door sealing assembly 4, the blowout preventer housing 3, and the side door assembly 1 are all provided with side end face sealing rings 41.
[0022] The upper flange of the BOP is designed for connection, while the lower flange is connected to the wellhead of the Christmas tree. The high pressure internal to the BOP is maintained during operation. A side end cap seal assembly 41 is located at the connection between the side door assembly 1 and the BOP housing 3 to prevent internal pressure leakage.
[0023] The side door sealing assembly 4 is installed at the connection between the side door assembly 1 and the blowout preventer housing 3. The side door sealing assembly 4 specifically includes: a sealing ring 43, a mounting hole is provided on the circumferential edge of the sealing ring 43, and end sealing rings 42 are respectively provided on the end faces of the sealing ring 43. The end sealing rings 42 are respectively in sealing contact with the blowout preventer housing 3 and the side door assembly 1. The side end face sealing rings 41 are installed on the two side faces of the sealing ring 43.
[0024] Furthermore, in the present invention, the sealing surface cross section of the sealing ring 43 is a conical sealing surface, and the end sealing ring 42 is arranged on the inclined surface of the conical sealing surface.
[0025] In the present utility model, Figure 3 As shown, the side end face seal ring 41 is an annular seal ring structure with a rectangular cross-section. Preferably, a first boss 411 is provided on the top of the rectangular structure, and a second boss 412 is provided at the rear end of the rectangular structure. Mounting slots 5 are provided on the BOP housing 3 and the side door assembly 1 to mate with the boss 411, and the first boss 411 is mounted within the slots 5. The sealing ring 43 has a hanging hole 431 on its side, and the second boss 412 is mounted within the hanging hole 431 to prevent it from falling. When the BOP housing 3 and the side door assembly 1 compress against each other and generate pressure, the compression is transmitted to the boss 411, which compresses against the annular seal ring structure, forming a tight seal. An end seal ring 42 is mounted on each side of the sealing ring 43. Each end seal ring 42 is an O-ring, providing a dual-pass seal. Exemplarily, mounting slots are provided on both sides of the sealing ring 43, and the end seal rings 42 are fixedly mounted within these mounting slots.
[0026] Sealing principle of this utility model:
[0027] like Figure 1 and Figure 2As shown, under the preload force of the side door bolts, the side door assembly 1 squeezes the side door seal assembly 4, tightly affixing it to the BOP housing 3. Both the side end face seal ring 41 and the end seal ring 42 on the side door seal assembly 4 are pre-compressed to a certain degree. Under the internal pressure of the BOP, the side end face seal ring 41 is squeezed outward, forming a reliable seal with the pre-compression on both sides. The end seal ring 42 on the sealing ring 43 only has a pre-compression force; the internal pressure does not act on this O-ring.
[0028] If the side end face seal ring 41 suffers from long-term compression, its sealing capability degrades, leading to a certain amount of leakage, the end seal ring 42 on the seal ring 43 will contain the leaking pressure, forming a second sealing barrier. Under the action of internal pressure, the seal ring 43, along with the BOP housing 3 and the side door assembly 1, will deform to a certain extent. Because the seal ring 43 has a thinner wall, it is more easily deformed under internal pressure. Therefore, under pressure, the conical surfaces on both sides of the side door sealing gasket will expand together with the housing and side door, forming a tight fit. There is no gap between the conical sealing surfaces, so neither the side end face seal ring 41 nor the end seal ring 42 will be squeezed out and damaged by internal pressure, and both seals can ensure a long-term seal.
[0029] For those skilled in the art, it is obvious that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, any improvements and changes that may be made by those skilled in the art to certain parts of the present invention still reflect the principles of the present invention and still achieve the purpose of the present invention, and all fall within the scope of protection of the present invention.
Claims
1. An ultra-high pressure blowout preventer side door sealing device, characterized in that: include: A side door sealing assembly (4) is installed between a blowout preventer housing (3) and a side door assembly (1), wherein side contact surfaces between the side door sealing assembly (4), the blowout preventer housing (3) and the side door assembly (1) are all provided with a side end face sealing ring (41) and an end sealing ring (42).
2. The ultra-high pressure blowout preventer side door sealing device according to claim 1, characterized in that: The side door sealing assembly (4) comprises: a sealing ring (43); the end sealing rings (42) are arranged on both sides of the sealing ring (43); the end sealing rings (42) are in sealing contact with the blowout preventer housing (3) and the side door assembly (1), respectively; and the side end face sealing rings (41) are installed on both side surfaces of the sealing ring (43).
3. The ultra-high pressure blowout preventer side door sealing device according to claim 2, characterized in that: The circumferential edge of the sealing ring (43) is provided with a mounting hole, and the sealing ring (43) is fixedly connected to the blowout preventer housing (3) or the side door assembly (1) through the mounting hole and screws.
4. The ultra-high pressure blowout preventer side door sealing device according to claim 2 or 3, characterized in that: The sealing surface cross section of the sealing ring (43) is a conical sealing surface, and the end sealing ring (42) is arranged on the inclined surface of the conical sealing surface.
5. The ultra-high pressure blowout preventer side door sealing device according to claim 4, characterized in that: Mounting grooves are provided on both sides of the sealing ring (43), and the end sealing ring (42) is fixedly mounted in the mounting grooves.
6. The ultra-high pressure blowout preventer side door sealing device according to claim 5, characterized in that: The side end face sealing ring (41) is an annular sealing ring structure, and the cross section of the annular sealing ring structure is a rectangular structure.
7. The ultra-high pressure blowout preventer side door sealing device according to claim 6, characterized in that: A first boss (411) is provided on the upper surface of the rectangular structure, and a mounting slot (5) matching the first boss (411) is provided on the blowout preventer housing (3) and the side door assembly (1).
8. The ultra-high pressure blowout preventer side door sealing device according to claim 7, characterized in that: A second boss (412) is provided at the tail of the rectangular surface of the rectangular structure, a hanging hole (431) is provided on the side of the sealing ring (43), and the second boss (412) is hung in the hanging hole (431).