A quick disconnect seal assembly for a rotary blowout preventer
Patent Information
- Application Number
- CN202522585555.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-05
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-12-05
AI Technical Summary
[0004]然而，在现场作业过程中，进行起钻、下钻等操作时，都需要对胶芯总成5进行拆装，而传统的胶芯总成5的内径在使用过程中会出现不可避免的磨损，在长期使用后，仅依靠钻具将胶芯总成5取出时，胶芯总成5可能发生中途掉落的情况，不仅具有较高的作业风险，而且一次性拆除取出的成功率较低，并且还会严重影响整体钻采油井的作业时效
[0014] By setting up a sealing core and a take-up shaft, the structure is simple and easy to install between the take-up shaft and the sealing core. The take-up shaft is connected to the drill string of the rotating blowout preventer. When the drill string rotates, it can dynamically seal the annular space at the wellhead to prevent fluid from spraying out of the well. It is easy to use and promote. When dismantling, the sealing core can be removed simply by lifting the drill string. In production well groups, the sealing core can be removed in one go, and the operation can be completed quickly, safely and efficiently.
Smart Images
Figure CN224859510U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil and gas drilling and production, specifically to a sealing device for quick assembly and disassembly of a rotary blowout preventer. Background Technology
[0002] Rotary blowout preventers (BOPs) are important well control equipment in oil well drilling and production processes. They typically include a rotating assembly (4), a rubber core assembly (5), and a housing, as shown in the attached diagram. Figure 2 As shown, it is mainly used to dynamically seal the annular space at the wellhead during the rotation of the rotary assembly 4, preventing fluid from being ejected from the well.
[0003] In this system, the inner diameter of the traditional rubber core assembly 5 is usually smaller than the outer diameter of the rotating assembly 4. The rotating assembly 4 includes the drill string. When the rotating assembly 4 passes through the rubber core assembly 5, the rubber core assembly 5 can generate a pre-tightening force under its own elasticity, thus tightening the rotating assembly 4. At the same time, the oil and gas pressure in the well can act on the rubber core assembly 5 to generate a sealing force, enhancing its sealing effect. This achieves the sealing between the drilling wellbore and the casing, and between the drilling wellbore and the rotating assembly 4, and enables the rotating assembly 4 to maintain the sealing of the wellhead during rotation, thus enabling operations such as drilling under pressure.
[0004] However, during field operations, the rubber core assembly 5 needs to be disassembled and reassembled when performing operations such as tripping and running the drill string. The inner diameter of the traditional rubber core assembly 5 will inevitably wear during use. After long-term use, when the rubber core assembly 5 is removed by the drill string alone, the rubber core assembly 5 may fall off midway. This not only poses a high operational risk, but also has a low success rate of removal in one go, and will seriously affect the overall drilling and production efficiency of the oil well. Utility Model Content
[0005] In view of the deficiencies of the prior art described above, the technical problem to be solved by this utility model is to provide a sealing device for quick assembly and disassembly of a rotary blowout preventer, which can achieve dynamic sealing of the wellhead when the drill string is rotating, and can be quickly assembled and disassembled.
[0006] To achieve the above objectives, this utility model provides a sealing device for quick assembly and disassembly of a rotary blowout preventer (BOP), which can be connected to the drill bit of the rotary BOP. It includes a sealing core and a feed shaft. The sealing core has a through hole at its top end, and an elastic connecting plate is fixedly mounted on the top end of the sealing core. The elastic connecting plate has a connecting hole, the diameter of which is smaller than the diameter of the through hole. The feed shaft includes a fixed section, a middle section, a support section, and an expansion section arranged sequentially from top to bottom. The fixed section, middle section, support section, and expansion section are integrally formed. The top end of the fixed section is fixedly connected to the drill bit. The diameter of the middle section is smaller than the diameter of the connecting hole. The diameter of the support section is larger than the diameter of the connecting hole but smaller than the diameter of the through hole. The expansion section is shaped as a frustum with a gradually decreasing diameter from top to bottom. The diameter of the top end of the expansion section is the same as the diameter of the support section, and the diameter of the bottom end of the expansion section is smaller than the diameter of the connecting hole.
[0007] Furthermore, the elastic connecting plate is circular in shape, and the diameter of the elastic connecting plate is the same as the diameter of the top of the sealing core. Specifically, the circular elastic connecting plate has good central symmetry, and the mass is symmetrically distributed around the axis of rotation. When rotating, the centrifugal force in each direction is equal in magnitude and opposite in direction, which can minimize vibration and rotational resistance.
[0008] Furthermore, the center of the connecting hole coincides with the center of the elastic connecting plate, which specifically eliminates eccentric loads, avoids local stress concentration, and ensures a uniform stress state for the elastic connecting plate.
[0009] Furthermore, the material of the elastic connecting plate includes wear-resistant spring steel and copper-based wear-resistant elastic alloy. Specifically, wear-resistant spring steel has high surface hardness, strong resistance to abrasive wear, and high elastic limit, while copper-based wear-resistant elastic alloy has high surface hardness and strong wear resistance and corrosion resistance.
[0010] Furthermore, the fixed section, intermediate section, and support section of the pick-and-place shaft are all made of alloy steel. Specifically, alloy steel has good matrix hardness and wear resistance, while also having a certain degree of toughness, which can prevent brittle fracture under impact loads.
[0011] Furthermore, the expansion section of the pick-and-place shaft is made of rubber, specifically rubber, which has good elasticity and wear resistance.
[0012] Furthermore, transition sections are provided between the fixed section and the intermediate section of the pick-and-feed shaft, as well as between the support section and the expansion section. Specifically, by providing transition sections, stress concentration can be eliminated, local load concentration can be reduced, and the fatigue life of the pick-and-feed shaft can be improved.
[0013] As described above, the sealing device for quick assembly and disassembly of a rotary blowout preventer according to this utility model has the following beneficial effects:
[0014] By setting up a sealing core and a take-up shaft, the structure is simple and easy to install between the take-up shaft and the sealing core. The take-up shaft is connected to the drill string of the rotating blowout preventer. When the drill string rotates, it can dynamically seal the annular space at the wellhead to prevent fluid from spraying out of the well. It is easy to use and promote. When dismantling, the sealing core can be removed simply by lifting the drill string. In production well groups, the sealing core can be removed in one go, and the operation can be completed quickly, safely and efficiently. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the sealing device in this utility model.
[0016] Figure 2 This is a schematic diagram of the traditional rotating assembly and rubber core assembly.
[0017] Explanation of icon numbers
[0018] 1. Sealing core; 101. Through hole; 2. Feeding shaft; 201. Fixed section; 202. Intermediate section; 203. Support section; 204. Expansion section; 3. Elastic connecting plate; 301. Connecting hole; 4. Rotating assembly; 5. Core assembly. Detailed Implementation
[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.
[0020] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0022] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0023] See Figure 1 This utility model provides a quick-release sealing device for a rotary blowout preventer (BOP), which can be connected to the drill bit of the rotary BOP. It includes a sealing core 1 and a feed shaft 2. The sealing core 1 has a through hole 101 at its top end, and an elastic connecting plate 3 is fixedly mounted on the top end of the sealing core 1. Preferably, the elastic connecting plate 3 is integrally formed with the sealing core 1, and a connecting hole 301 is provided on the elastic connecting plate 3. The diameter of the connecting hole 301 is smaller than the diameter of the through hole 101. The feed shaft 2 includes a fixed section 201, a middle section 202, a support section 203, and an expansion section 204 arranged sequentially from top to bottom. The fixed section 201, middle section 202, support section 203, and expansion section 204 are integrally formed. Specifically, the top end of the middle section 202 is connected to the bottom end of the fixed section 201, and the bottom end of the middle section 202 is connected to the top end of the support section 203. The expansion section 204 is connected to the bottom of the support section 203, and the top of the fixed section 201 is fixedly connected to the drill bit. The diameter of the middle section 202 is smaller than the diameter of the connecting hole 301, and the diameter of the support section 203 is larger than the diameter of the connecting hole 301 and smaller than the diameter of the through hole 101. Preferably, the diameter of the support section 203 is the same as the diameter of the through hole 101. In use, the support section 203 and the expansion section 204 of the feed shaft 2 are both located in the inner cavity of the through hole 101 of the sealing core 1. Furthermore, the outer peripheral surface of the support section 203 abuts against the inner wall surface of the through hole 101 of the sealing core 1 for easy use. The shape of the expansion section 204 is set as a frustum with a diameter that gradually decreases from top to bottom. The diameter of the top of the expansion section 204 is the same as the diameter of the support section 203, and the diameter of the bottom of the expansion section 204 is smaller than the diameter of the connecting hole 301.
[0024] The basic working principle of the sealing device for quick assembly and disassembly of a rotary blowout preventer involved in this utility model is as follows: During use, when the expansion section 204 of the delivery shaft 2 passes through the connecting hole 301 of the elastic connecting plate 3, the wall of the connecting hole 301 abuts against the outer circumferential surface of the expansion section 204. When an axial force is applied to the delivery shaft 2 along its axial direction, the wall of the connecting hole 301 generates a normal constraint force on the outer circumferential surface of the expansion section 204. Simultaneously, the outer circumferential surface of the expansion section 204 also generates a reaction force, i.e., a radial expansion force, on the wall of the connecting hole 301. This causes the connecting hole 301 of the elastic connecting plate 3 to gradually expand until the support section 203 of the delivery shaft 2 completely passes through the elastic connecting plate. With the connecting hole 301 of plate 3 in place, the support section 203 and expansion section 204 of the take-up shaft 2 are both located in the inner cavity of the through hole 101 of the sealing core 1. The connecting hole 301 of the elastic connecting plate 3 returns to its original shape under its own elastic force, completing the installation of the sealing core. Furthermore, the fixed section 201 of the take-up shaft 2 is connected to the drill string of the rotating blowout preventer, so that the wellhead can still be sealed during the rotation of the drill string. When removing the core, since the elastic connecting plate 3 presses against the right-angle shoulder of the support section 203 of the take-up shaft 2, the sealing core 1 can be directly removed by lifting the drill string, thus completing the removal of the sealing core and greatly improving the installation and removal speed of the sealing core 1.
[0025] See Figure 1 The present invention will be further described below with reference to a specific embodiment:
[0026] In this embodiment, see Figure 1 As a preferred design, the elastic connecting plate 3 is circular in shape, and the diameter of the elastic connecting plate 3 is the same as the diameter of the top of the sealing core 1. Specifically, the circular elastic connecting plate 3 has good central symmetry, and its mass is symmetrically distributed around the axis of rotation. When rotating, the centrifugal force in each direction is equal in magnitude and opposite in direction, which can minimize vibration and rotational resistance.
[0027] In this embodiment, see Figure 1 As a preferred design, the center of the connecting hole 301 coincides with the center of the elastic connecting plate 3. Specifically, this can eliminate eccentric loads, avoid local stress concentration, and ensure a uniform stress state for the elastic connecting plate 3.
[0028] In this embodiment, see Figure 1 As a preferred design, the material of the elastic connecting plate 3 includes wear-resistant spring steel and copper-based wear-resistant elastic alloy. Specifically, wear-resistant spring steel has high surface hardness, strong resistance to abrasive wear, and high elastic limit. Copper-based wear-resistant elastic alloy has high surface hardness and strong wear resistance and corrosion resistance.
[0029] In this embodiment, see Figure 1As a preferred design, the fixed section 201, intermediate section 202, and support section 203 of the pick-up and delivery shaft 2 are all made of alloy steel. Specifically, alloy steel has good matrix hardness and wear resistance, while also having a certain degree of toughness, which can prevent brittle fracture under impact load.
[0030] In this embodiment, see Figure 1 As a preferred design, the expansion section 204 of the feed shaft 2 is made of rubber, which has good elasticity and wear resistance.
[0031] In this embodiment, see Figure 1 As a preferred design, transition sections are provided between the fixed section 201 and the intermediate section 202 of the pick-up and delivery shaft 2, as well as between the support section 203 and the expansion section 204. Specifically, by providing transition sections, stress concentration can be eliminated, local load concentration can be reduced, and the fatigue life of the pick-up and delivery shaft 2 can be improved.
[0032] As can be seen from the above, the sealing device for quick assembly and disassembly of a rotary blowout preventer of this utility model has the following beneficial effects:
[0033] By setting up a sealing shaft core and a take-up shaft 2, the structure is simple and easy to install between the take-up shaft 2 and the sealing shaft core. The take-up shaft 2 is connected to the drill string of the rotating blowout preventer. When the drill string rotates, it can dynamically seal the annular space at the wellhead to prevent fluid from spraying out of the well. It is easy to use and promote. When dismantling, the sealing core 1 can be removed simply by lifting the drill string. In production well groups, the sealing shaft core can be removed in one go, and the operation can be completed quickly, safely and efficiently.
[0034] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.
[0035] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A quick-release sealing device for a rotating blowout preventer, capable of being connected to the drill string of the rotating blowout preventer, characterized in that: The assembly includes a sealing core (1) and a feeding shaft (2); the sealing core (1) has a through hole (101) at its top end, and an elastic connecting plate (3) is fixedly installed at the top end of the sealing core (1), and a connecting hole (301) is provided on the elastic connecting plate (3), the diameter of the connecting hole (301) being smaller than the diameter of the through hole (101); the feeding shaft (2) includes a fixed section (201), a middle section (202), a support section (203), and an expansion section (204) arranged sequentially from top to bottom. 03) The expansion section (204) is integrally formed. The top end of the fixed section (201) is fixedly connected to the drill bit. The diameter of the middle section (202) is smaller than the diameter of the connecting hole (301). The diameter of the support section (203) is larger than the diameter of the connecting hole (301) and smaller than the diameter of the through hole (101). The shape of the expansion section (204) is set as a frustum shape with the diameter gradually decreasing from top to bottom. The diameter of the top end of the expansion section (204) is the same as the diameter of the support section (203). The diameter of the bottom end of the expansion section (204) is smaller than the diameter of the connecting hole (301).
2. The sealing device for quick assembly and disassembly of a rotating blowout preventer according to claim 1, characterized in that: The elastic connecting plate (3) is circular in shape, and the diameter of the elastic connecting plate (3) is the same as the diameter of the top of the sealing core (1).
3. The sealing device for quick assembly and disassembly of a rotating blowout preventer according to claim 2, characterized in that: The center of the connecting hole (301) coincides with the center of the elastic connecting plate (3).
4. The sealing device for quick assembly and disassembly of a rotating blowout preventer according to claim 1, characterized in that: The elastic connecting plate (3) is made of wear-resistant spring steel or copper-based wear-resistant elastic alloy.
5. The sealing device for quick assembly and disassembly of a rotating blowout preventer according to claim 1, characterized in that: The fixed section (201), intermediate section (202), and support section (203) of the pick-and-place shaft (2) are all made of alloy steel.
6. The sealing device for quick assembly and disassembly of a rotating blowout preventer according to claim 1, characterized in that: The material of the expansion section (204) of the pick-and-place shaft (2) includes rubber.
7. The sealing device for quick assembly and disassembly of a rotating blowout preventer according to claim 1, characterized in that: A transition section is provided between the fixed section (201) and the intermediate section (202) of the pick-up and delivery shaft (2), as well as between the support section (203) and the expansion section (204).