Shell and side door quick connecting structure of ram blowout preventer

Abstract

The utility model discloses a shell and side door quick connecting structure of a ram blowout preventer, which comprises a shell, a side door assembly and a locking key, and is characterized in that the locking key is locked together with the shell and a side door in the side door assembly in a slope wedging or embedding manner; when the shell and the side door in the side door assembly need to be separated, the shell and the side door assembly can be quickly separated by pulling out the locking key. According to the utility model, the H-shaped bolt type locking key is adopted to replace a side door bolt in the traditional flashboard blowout preventer, so that the shell and the side door assembly are quickly connected and fixed, the time required for dismounting the bolt when a flashboard is replaced is saved, the labor intensity is reduced, and the working efficiency on site is effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of gate blowout preventers in well control blowout prevention devices, and particularly to a quick connection structure between the shell and the side door of a gate blowout preventer. Background Technology

[0002] Blowout preventers (BOPs) are an important component of well control systems in oil drilling. They effectively seal the annular space between the casing and the tubing string. Their main purpose is to control wellhead pressure during drilling, well workover, and well testing, effectively preventing blowout accidents and ensuring safe operation.

[0003] As a key sealing component of the blowout preventer, the gate's orifice diameter corresponds one-to-one with the drill string's outer diameter and is prone to wear. The gate must be replaced at different operational stages when drill string dimensions need to be changed or when the gate's rubber core is damaged.

[0004] Traditional blowout preventers use bolts to connect the housing and side gates. To ensure sealing pressure, these bolts are large and numerous. Therefore, disassembling and reinstalling these bolts is not only labor-intensive but also time-consuming when replacing the gate.

[0005] To improve the efficiency of gate replacement operations, many applicants have filed patent applications for technologies related to quick-connect structures between the housing and the side door:

[0006] For example, Chinese invention patent application publication number CN104712285A discloses a quick-connect side-door gate blowout preventer. When the side door assembly needs to be separated, the locating pin is removed, and the clamps are removed from the top and bottom. The side door assembly is then separated from the housing via hydraulic or manual control, achieving rapid separation of the housing from the side door. However, this patent still requires removing the locating pin first when removing the clamps. Therefore, replacing the gate still involves significant labor intensity and is time-consuming. Furthermore, in this patent, the clamps are not connected to the side door assembly and housing using a beveled wedge connection, making it easy for contact gaps to occur between the side door assembly and the housing.

[0007] The Chinese utility model patent authorization announcement number CN201486506U discloses a quick-connect side-door gate blowout preventer, applied to oil wellhead control devices. Its quick-opening side door operation method involves: loosening the locking screw, reducing the contact force between the vertical push rod and the pad, pulling out the pad from both sides of the side door base, injecting hydraulic oil into the opening oil circuit of the bidirectional telescopic cylinder, causing the piston rod to retract, and after the locking block is fully retracted into the groove of the side door base, the opening piston rod moves the side door assembly outward until the gate assembly is fully exposed for gate replacement. Therefore, this patent requires loosening the locking screw before gate replacement, resulting in high labor intensity and a relatively long time consumption. Furthermore, the side door assembly and the housing are not connected by a beveled wedge joint, making it easy for contact gaps to occur between the side door assembly and the housing.

[0008] The quick-connect side door of the gate blowout preventer disclosed in Chinese Utility Model Patent Publication No. CN201250637Y has the following unlocking process: Loosen the pressure plate screw by rotating it, allowing the pressure plate to rotate freely and exposing the outer port of the circular hole. Use a puller to remove the locking rod or a push rod to push out the locking rod. At this point, the side door disengages from the blowout preventer housing, and the side door can be opened. Therefore, when replacing the gate, this patent requires loosening the pressure plate screw first, which is still labor-intensive and time-consuming. Furthermore, the locking rod in this patent is not connected to the side door assembly and housing using a beveled wedge method, making it easy for contact gaps to occur between the side door assembly and the housing.

[0009] Chinese invention patent application publication number CN101111660A (US7195224B2) discloses a gate device for a blowout preventer. This gate device includes a piston for moving a gate plate and a locking shaft extending from the piston into a housing. The locking shaft includes a tapered portion. The gate device further includes a locking member. In use, when the piston is extended, the tapered portion (41) of the locking shaft moves to the locking member, and the locking member moves against the tapered portion to prevent the piston from retracting. This patent has a complex structure and high cost. Furthermore, in this patent, the locking member is not connected to the side door assembly and the housing using a wedge-shaped connection, which makes it easy for contact gaps to occur between the side door assembly and the housing. Utility Model Content

[0010] The technical problem this utility model aims to solve is to address the issues of high labor intensity, long time consumption, and complex structure in existing quick-connect structures for the shell and side door of gate blowout preventers. This invention provides a quick-connect structure for the shell and side door of a gate blowout preventer that is labor-intensive, time-saving, has no gap between the side door assembly and the shell after locking, and has a simple structure.

[0011] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0012] A quick-connect structure for the housing and side door of a blowout preventer includes a housing, a side door assembly, and a locking key. The locking key is locked together with the housing and the side door in the side door assembly by a wedge-shaped or interlocking method. When it is necessary to separate the housing from the side door in the side door assembly, the locking key can be pulled out to quickly separate the housing from the side door assembly.

[0013] In a preferred embodiment of this utility model, at least one transversely penetrating first locking groove is provided on the upper and lower sides of the cavity of the housing, and at least one first locking slope is provided in the first locking groove; at least one transversely penetrating second locking groove is provided on the upper and lower sides of the side door relative to the gate shaft in the side door assembly, and at least one second locking slope is provided in the second locking groove; a first locking edge and a second locking edge are provided on the locking key, and at least one third locking slope and a fourth locking slope are provided on the first locking edge and the second locking edge, respectively; when the housing and the side door assembly are locked, the first locking edge is inserted into the first locking groove and the first locking slope and the third locking slope are locked by a slope wedge engagement, and the second locking edge is inserted into the second locking groove and the second locking slope and the fourth locking slope are locked by a slope wedge engagement.

[0014] In a preferred embodiment of the present invention, both the first locking groove and the second locking groove are T-shaped grooves; the first locking edge and the second locking edge are connected to each other by a horizontal edge, and the first locking edge, the second locking edge, and the horizontal edge are arranged in an H-shaped cross-section.

[0015] In a preferred embodiment of this utility model, the first locking inclined surface forms a vertical surface or inclined surface with an angle greater than 85° and less than 90° with the end face of one end of the first locking groove; the second locking inclined surface forms a vertical surface or inclined surface with an angle greater than 85° and less than 90° with the end face of one end of the second locking groove; the third locking inclined surface and the fourth locking inclined surface form a vertical surface or inclined surface with an angle greater than 85° and less than 90° with the end face of one end of the locking key.

[0016] In a preferred embodiment of this utility model, a locking block guard plate is fixed to the end face of at least one side of the side door in the housing and the side door assembly using guard plate screws. The locking block guard plate is located outside at least one end of the locking key to prevent the locking key from slipping out along the axial direction. After removing the locking block guard plate, the locking key can be removed.

[0017] Due to the adoption of the above technical solution, the locking key of this utility model is locked together with the housing and the side door assembly by a beveled wedge engagement method; when it is necessary to separate the housing from the side door in the side door assembly, the locking key can be pulled out to quickly separate the housing from the side door assembly, realizing the quick connection between the housing and the side door, reducing the time, manpower and tools required to replace the gate, and improving the safety of operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the connection between the housing and the side door of the gate blowout preventer of this utility model.

[0019] Figure 2 This is a schematic diagram showing the separation of the housing and side door of the gate blowout preventer of this utility model.

[0020] Figure 3 This is a schematic diagram of the locking key structure of Embodiment 1 of the gate blowout preventer of this utility model.

[0021] Figure 4 This is a schematic diagram of a locking key structure in Embodiment 2 of the gate blowout preventer of this utility model.

[0022] Figure 5 This is a schematic diagram of the locking key structure of Embodiment 2 of the gate blowout preventer of this utility model. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] See Figure 1 and Figure 2 The main features of this utility model are:

[0025] A quick-connect structure for the housing and side door of a gate blowout preventer includes a housing 4, a side door assembly 1, and a locking key 5. The locking key 5 is locked together with the housing 4 and the side door 1a in the side door assembly 1 by means of inclined wedge engagement or fitting. When it is necessary to separate the housing 4 from the side door 1a in the side door assembly 1, the locking key 5 is pulled out, and the housing 4 and the side door assembly 1 can be quickly separated to replace the gate.

[0026] The quick-connect structure between the housing 4 and the side door 1a of the gate blowout preventer is described in detail below:

[0027] A first locking groove 4a is provided on the upper and lower sides of the cavity of the housing 4, respectively. The first locking groove 4a is perpendicular to the diameter direction of the housing 4 and is a T-shaped groove. Two first locking ramps 4-1 are provided in the first locking groove 4a, and the two first locking ramps 4-1 are arranged vertically.

[0028] In the side door assembly 1, the side door 1a has at least one transversely penetrating second locking groove 1b on the upper and lower sides relative to the gate shaft. The second locking groove 1b is also perpendicular to the through-diameter direction of the housing 4 and is a T-shaped groove. Two second locking ramps 4-1 are provided in the second locking groove 4a, and the two second locking ramps 4-1 are arranged vertically.

[0029] A first locking edge 5a and a second locking edge 5b are provided on the locking key 5 and are connected to each other. The first locking edge 5a and the second locking edge 5b are connected to each other through a horizontal edge 5c. The first locking edge 5a, the second locking edge 5b and the horizontal edge 5c are arranged in an H-shape in cross section.

[0030] Two third locking ramps 5-2 and two fourth locking ramps 5-1 are respectively arranged vertically on the first locking edge 5a and the second locking edge 5b. The two third locking ramps 5-2 are arranged vertically on the inner surface of the first locking edge 5a, and the two fourth locking ramps 5-1 are arranged vertically on the inner surface of the second locking edge 5b. Each third locking ramp 5-2 is arranged opposite to each fourth locking ramp 5-1.

[0031] When the housing 4 is locked to the side door 1a of the side door assembly 1, the first locking groove 4a and the second locking groove 1b form an H-shaped groove whose cross-section matches the cross-section of the locking key 5. The locking key 5 is inserted into the H-shaped groove. The first locking edge 5a is inserted into the first locking groove 4a and the first locking slope 4-1 and the third locking slope 5-2 are locked by a slope wedge engagement. The second locking edge 5b is inserted into the second locking groove 1b and the second locking slope 1-1 and the fourth locking slope 5-1 are locked by a slope wedge engagement.

[0032] To prevent the locking key 5 from slipping off due to movement along the axial direction, a locking block guard plate 2 is fixed to the end face 4-2 of one or both sides of the side door 1a in the housing 4 and the side door assembly 1 using guard plate screws 3. The locking block guard plate 2 is located outside one or both ends of the locking key 5 to prevent the locking key from slipping off due to movement along the axial direction. After removing the locking block guard plate 2, the locking key 5 can be removed.

[0033] Example 1

[0034] Combination Figure 1 , Figure 2 and Figure 3 The first locking bevel 4-1 is perpendicular to the end face 4-2 of one end of the first locking groove 4a; the second locking bevel 1-1 is perpendicular to the end face 1-2 of one end of the second locking groove 1b; the third locking bevel 5-2 and the fourth locking bevel 5-1 are perpendicular to the end face 5-3 of one end of the locking key 5.

[0035] Example 2

[0036] Combination Figure 1 , Figure 2 , Figure 4 and Figure 5 The first locking inclined surface 4-1 and the end face 4-2 of one end of the first locking groove 4a form an angle greater than 85° and less than 90°; the third locking inclined surface 5-2 and the fourth locking inclined surface 5-1 form an angle greater than 85° and less than 90° with the end face 5-3 of one end of the locking key 5.

[0037] The working principle of the quick-connect structure between the shell and the side door of the gate blowout preventer of this utility model is as follows:

[0038] When the side door assembly 1 is attached to the housing 5, the locking key 5 is inserted into the H-shaped groove formed by the first locking groove 4a and the second locking groove 1b from the side. The locking key guard plate 2 is rotated to enclose the locking key 5 in the side door 1a of the housing 5 and the side door assembly 1. The guard plate screw 3 is tightened to fix the locking key guard plate 2, which can effectively prevent the locking key 5 from moving left and right and slipping off, and effectively fix the side door 1a to the housing 5 and the side door 1a of the side door assembly 1.

[0039] Quick opening of the side door 1a of the housing 5 and side door assembly 1: Loosen the guard plate screw 3, rotate the locking key guard plate 2 until the locking key 5 is fully exposed, tighten the guard plate screw 3, and fix the locking key guard plate 2. Use a pin puller or a push rod to remove the locking key 5 from the H-shaped groove formed by the first locking groove 4a and the second locking groove 1b. At this time, the connection between the housing 5 and the side door 1a of the side door assembly 1 is removed, and the side door assembly 1 can be opened hydraulically to replace the gate or seal.

Claims

1. A quick-connect structure between the housing and side door of a gate blowout preventer, comprising a housing, a side door assembly, and a locking key, characterized in that, The locking key is locked together with the side door of the housing and side door assembly by means of a bevel wedge or a fitting method; when it is necessary to separate the housing from the side door of the side door assembly, the locking key can be pulled out to quickly separate the housing from the side door assembly.

2. The quick-connect structure between the housing and side door of the gate blowout preventer according to claim 1, characterized in that, At least one transversely penetrating first locking groove is provided on the upper and lower sides of the cavity of the housing, and at least one first locking ramp is provided in the first locking groove; at least one transversely penetrating second locking groove is provided on the upper and lower sides of the side door relative to the gate shaft in the side door assembly, and at least one second locking ramp is provided in the second locking groove; a first locking edge and a second locking edge are provided on the locking key, and at least one third locking ramp and a fourth locking ramp are provided on the first locking edge and the second locking edge, respectively; when the housing and the side door assembly are locked, the first locking edge is inserted into the first locking groove and the first locking ramp and the third locking ramp are locked by a ramp wedge engagement, and the second locking edge is inserted into the second locking groove and the second locking ramp and the fourth locking ramp are locked by a ramp wedge engagement.

3. The quick-connect structure between the housing and side door of the gate blowout preventer according to claim 2, characterized in that, Both the first locking groove and the second locking groove are T-shaped grooves; the first locking edge and the second locking edge are connected to each other by a horizontal edge, and the first locking edge, the second locking edge, and the horizontal edge are arranged in an H-shaped cross section.

4. A quick-connect structure between the housing and side door of a gate blowout preventer according to any one of claims 2 to 3, characterized in that, The first locking inclined surface forms a vertical or inclined plane with an angle greater than 85° and less than 90° with the end face of one end of the first locking groove; the second locking inclined surface forms a vertical or inclined plane with an angle greater than 85° and less than 90° with the end face of one end of the second locking groove; the third and fourth locking inclined surfaces form a vertical or inclined plane with an angle greater than 85° and less than 90° with the end face of one end of the locking key.

5. The quick-connect structure between the housing and side door of the gate blowout preventer according to claim 4, characterized in that, A locking block guard plate is fixed to the end face of at least one side of the side door in the housing and the side door assembly using guard plate screws. The locking block guard plate is located outside at least one end of the locking key to prevent the locking key from slipping out along the axial direction. The locking key can be removed by removing the locking block guard plate.

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