A clamp for a wellhead casing head

Abstract

The utility model provides a kind of for wellhead casing head fixture, comprising: driving mechanism and the chuck being set in the flange hole of casing head flange and lower surface and wedge slip engagement, the inner wall of chuck is evenly provided with multiple grooves along the circumference, and driving mechanism is set in the inside of groove;Driving mechanism includes: the card tooth being set in groove along the outer periphery of casing, the piston rod being connected with the side of card tooth away from casing at first end, and the piston cylinder being connected with the second end of piston rod, and piston cylinder is connected to the grease injection mechanism for injecting grease into it.The utility model can remotely realize the connection of casing head and casing, make rescue workers away from out-of-control wellhead, improve the efficiency of oil and gas well serious well control rescue emergency disposal, reduce the safety risk of operating personnel.

Description

Technical Field

[0001] This utility model belongs to the field of wellhead emergency repair technology, specifically, it relates to a clamp for wellhead casing head. Background Technology

[0002] Casing heads are typically used to fix the wellhead, connect the wellhead casing, support the technical casing and the oil layer casing, seal the annular space between different casing layers, and provide a transition connection for installing blowout preventers, tubing heads, and Christmas trees. Through the two side openings on the casing head body, drilling operations such as mud filling, monitoring, and adding balancing fluid can be performed.

[0003] When the casing head is damaged due to a blowout, the workers install the casing head at the wellhead on site. This is usually done by installing fixed wedge slips inside the casing head to make the wedge slips and the casing form a stable working state. During the entire rescue process, the workers are close to the out-of-control wellhead, which poses a great safety risk. Summary of the Invention

[0004] One objective of this invention is to provide a clamp for wellhead casing heads that enables remote connection between the casing head and the casing, allowing emergency response personnel to stay away from out-of-control wellheads, improving the efficiency of emergency response to severe well control issues in oil and gas wells, and reducing the safety risks for personnel.

[0005] According to this utility model, a clamp for a wellhead casing head is provided, comprising: a casing head body and a casing head flange fixedly disposed on the top of the casing head body. The clamp comprises: a driving mechanism and a chuck disposed within a flange hole of the casing head flange and whose lower surface engages with wedge-shaped slips. The inner wall of the chuck is uniformly provided with multiple grooves along its circumference. The driving mechanism is disposed within the grooves. The driving mechanism comprises: a locking tooth disposed within the groove along the outer circumference of the casing; a piston rod with its first end connected to the side of the locking tooth away from the casing; and a piston cylinder connected to the second end of the piston rod. The piston cylinder is connected to a grease injection mechanism for injecting grease into it.

[0006] In a preferred embodiment, the chuck and the sleeve head flange are connected by a chuck anti-drop mechanism, which includes: a fixed pressure plate disposed on the upper surface of the chuck, a pressure rod that vertically passes through the fixed pressure plate and enters the accommodating space of the chuck, and an elastic element sleeved on the outer periphery of the pressure rod. The fixed pressure plate is fixedly connected to the sleeve head flange.

[0007] In a preferred embodiment, the elastic element is disposed within the accommodating space, with its bottom end connected to the bottom end of the pressure rod and its top end connected to the chuck to form the top inner wall of the accommodating space.

[0008] In a preferred embodiment, the accommodating space extends from the lower surface of the chuck into the interior of the chuck, and the chuck anti-drop mechanism further includes an elastic pressure plate fixedly disposed on the lower surface of the chuck and closing the bottom of the accommodating space.

[0009] In a preferred embodiment, the pressure bar is configured as a T-shape, with its bottom end disposed within the accommodating space and in contact with the elastic pressure plate, and its top end fixedly connected to the fixed pressure plate, wherein the area of ​​the bottom end of the pressure bar is larger than the area of ​​the top end.

[0010] In a preferred embodiment, the grease injection mechanism includes: a hydraulic cylinder assembly and a grease injection chamber connected to the output end of the hydraulic cylinder assembly, the grease injection chamber being connected to the inlet end of a one-way valve via a first hose, and the outlet end of the one-way valve being connected to the piston cylinder via a piping assembly.

[0011] In a preferred embodiment, a connecting groove is provided inside the casing head flange, and the pipeline assembly includes: a grease injection hose disposed on the outer periphery of the wellhead casing head, a rigid tube disposed in the connecting groove and having its first end connected to the grease injection hose, and a second hose having its first end connected to the second end of the rigid tube, the second end of the second hose being connected to the piston cylinder.

[0012] In a preferred embodiment, the grease injection hose is constructed in a circular shape, with a connecting four-way valve and multiple connecting three-way valves evenly arranged on it. One port of each connecting four-way valve and connecting three-way valve is connected to the rigid tube inside the disc, and one port of the connecting four-way valve is connected to the grease injection mechanism through the one-way valve.

[0013] In a preferred embodiment, the chuck is configured as a ring.

[0014] In a preferred embodiment, the lower surface of the chuck is provided with a T-slot, and a wedge-shaped slip is engaged in the T-slot.

[0015] This utility model has at least the following technical effects: According to this utility model, a driving mechanism and a chuck are provided, which are disposed in the flange hole of the casing head flange and whose lower surface engages with wedge-shaped slips. The inner wall of the chuck has multiple grooves evenly distributed circumferentially. The driving mechanism is disposed inside the grooves and includes: a locking tooth disposed in the groove along the outer circumference of the casing; a piston rod with its first end connected to the side of the locking tooth away from the casing; and a piston cylinder connected to the second end of the piston rod. The piston cylinder is connected to an external grease injection mechanism for injecting grease into it. Grease is remotely injected into the piston cylinder through the grease injection mechanism to drive the locking tooth to engage with the outer circumference of the casing and restrict the upward movement of the wedge-shaped slips. When the casing head moves upward a certain distance at the wellhead, the wedge-shaped slips can move towards the side of the casing under lateral force and engage the casing, thereby enabling remote connection between the casing head and the casing. This allows rescue personnel to stay away from the out-of-control wellhead, improving the efficiency of emergency response to severe well control issues in oil and gas wells and reducing the safety risks to personnel. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of a clamp for a wellhead casing head according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of the chuck structure of a clamp for a wellhead casing head according to an embodiment of the present invention is shown. Figure 3 The schematic diagram shows the structure of the clamp for the wellhead casing head after assembly with the wellhead casing head; Figure 4 A schematic diagram of a chuck anti-fall mechanism for a wellhead casing head according to an embodiment of the present invention is shown.

[0017] In this application, all the accompanying drawings are schematic drawings, used only to illustrate the principle of the present invention, and are not drawn to scale. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of the utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the utility model.

[0020] In this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between 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.

[0021] like Figures 1 to 3 As shown, this utility model provides a clamp 100 for a wellhead casing head, wherein the wellhead casing head includes: a casing head body and a casing head flange c fixedly disposed on the top of the casing head body. The flange hole of the casing head flange c is disposed on the outer periphery of the casing inside the well. The casing head flange is connected to the connecting flange located at the bottom of the drilling cross. The clamp 100 for the wellhead casing head includes: a driving mechanism and a chuck a disposed in the flange hole of the casing head flange c. The lower surface of the chuck a engages with a wedge-shaped slip g. The inner wall of the chuck a has a plurality of grooves b evenly distributed circumferentially. The driving mechanism is disposed inside the grooves b. The driving mechanism includes: a jaw d disposed in the groove b along the outer periphery of the casing, a piston rod e connected at the first end to the side of the jaw d away from the casing, and a piston cylinder f connected to the second end of the piston rod e. The piston cylinder f is connected to an external grease injection mechanism for injecting grease into it. Optionally, the chuck a is constructed as an annular shape. Optionally, a T-slot is provided on the lower surface of the chuck a, and the wedge-shaped slip g is engaged in the T-slot.

[0022] The following is a brief description of the usage process of the clamp 100 for the wellhead casing head described in this utility model. When the wellhead casing head equipped with the clamp 100 is centered and lowered to the designated position on the casing using a rotary drilling rig, the grease injection mechanism injects sealing grease into the piston cylinder f, thereby pressurizing and driving the piston rod e to move. When the pressure of the sealing grease reaches a preset pressure value, the piston rod e drives the jaws d to move towards the casing and engage with the outer surface of the casing, thus fixing the jaws to the outer surface of the casing. When the wellhead casing head is lifted by the rotary drilling rig, the chuck a engages with the casing through its jaws d and the wedge-shaped slips g engage with the lower surface of the clamp 3, thus restricting the upward movement of the wedge-shaped slips g.

[0023] Furthermore, because the wedge-shaped slips g are in contact with the inner wall of the casing head (the inner diameter gradually increases towards the chuck a), when the casing head moves upward a certain distance, the wedge-shaped slips g move towards the side of the casing under lateral force and lock the casing. The greater the lifting force applied by the rotary drilling rig, the greater the locking force applied by the wedge-shaped slips g to the casing, and the more it restricts the casing head from moving upward.

[0024] According to this utility model, a driving mechanism and a chuck a are provided, which are disposed in the flange hole of the casing head flange c and whose lower surface engages with the wedge-shaped slip g. The inner wall of the chuck a has multiple grooves b evenly distributed circumferentially. The driving mechanism is disposed inside the grooves b. The driving mechanism includes: a locking tooth d disposed in the groove b along the outer periphery of the casing; a piston rod e with its first end connected to the side of the locking tooth d away from the casing; and a piston cylinder f connected to the second end of the piston rod e. The piston cylinder f is connected to an external grease injection mechanism for injecting grease into it. Grease is remotely injected into the piston cylinder f through the grease injection mechanism to drive the locking tooth d to engage with the outer periphery of the casing and restrict the upward movement of the wedge-shaped slip g. When the casing head moves upward a certain distance at the wellhead, the wedge-shaped slip g can move towards the side of the casing under lateral force and engage the casing, thereby enabling remote connection between the casing head and the casing. This allows rescue personnel to stay away from the out-of-control wellhead, improves the efficiency of emergency response to severe well control issues in oil and gas wells, and reduces the safety risks to personnel.

[0025] like Figure 4 As shown, in one or more embodiments, the chuck a and the sleeve head flange c are connected by a chuck anti-drop mechanism. The chuck anti-drop mechanism includes: a fixed pressure plate 24 disposed on the upper surface of the chuck a, a pressure rod 25 vertically passing through the fixed pressure plate 24 and entering the receiving space of the chuck a, and an elastic element 22 sleeved on the outer periphery of the pressure rod 25. The fixed pressure plate 24 is fixedly connected to the sleeve head flange c. Optionally, the fixed pressure plate 24 is fixedly connected to the sleeve head flange through a pressure plate screw hole 26.

[0026] According to this utility model, a fixed pressure plate 24 is provided on the upper surface of the chuck a, a pressure rod 25 is provided that passes vertically through the fixed pressure plate 24 and enters the accommodating space of the chuck a, and an elastic element 22 is provided that is sleeved on the outer periphery of the pressure rod 25. Since the fixed pressure plate 24 is fixedly connected to the casing head flange c, when the casing head flange c moves upward with the casing head (a very small distance, for example, 0.5-1mm) under the action of the pressure inside the well, the chuck anti-fall mechanism can keep the chuck a stationary through the elastic element 22 and the pressure rod 25, so as not to affect the working state of the clamp 100.

[0027] In one or more embodiments, the elastic member 22 is disposed within the accommodating space, and the bottom end of the elastic member 22 is connected to the bottom end of the pressure rod 25, and the top end of the elastic member 22 is connected to the top inner wall of the accommodating space formed by the chuck a.

[0028] In one or more embodiments, the accommodating space extends vertically from the lower surface of chuck a into the interior of chuck a, and the chuck stopping mechanism further includes an elastic pressure plate 23 fixedly disposed on the lower surface of chuck a and closing the bottom of the accommodating space.

[0029] In one or more embodiments, the pressure rod 25 is configured as a T-shape, with the area of ​​its bottom end being larger than the area of ​​its top end. The bottom end of the pressure rod 25 is disposed within the accommodating space and contacts the elastic pressure plate 23. The top end of the pressure rod 25 is fixedly connected to the fixed pressure plate 24. Optionally, the top end of the pressure rod 25 is fixedly connected to the fixed pressure plate 24 by a fixing nut. Optionally, the elastic element 22 is a spring.

[0030] In one or more embodiments, the grease injection mechanism includes: a hydraulic cylinder assembly 10 and a grease injection chamber 9 connected to the output end of the hydraulic cylinder assembly 10, the grease injection chamber 9 being connected to the inlet end of a one-way valve 8 via a first hose 12, and the outlet end of the one-way valve 8 being connected to a piston cylinder f via a piping assembly.

[0031] In one or more embodiments, a connecting groove is provided inside the casing head flange, and the pipeline assembly includes: a grease injection hose 6 disposed on the outer periphery of the wellhead casing head, a hard pipe 4 disposed in the connecting groove and connected at its first end to the grease injection hose 6, and a second hose 3 whose first end is connected to the second end of the hard pipe 4, the second end of the second hose 3 being connected to the piston cylinder f.

[0032] In one or more embodiments, the grease injection hose 6 is constructed to be circular, with a connecting four-way valve 7 and a plurality of connecting three-way valves 5 evenly arranged thereon. One port of the connecting four-way valve 7 and the connecting three-way valves 5 are connected to the rigid tube 4 inside the disc, and one port of the connecting four-way valve 7 is connected to the grease injection mechanism through a one-way valve 8.

[0033] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A clamp for a wellhead casing head, the wellhead casing head comprising: The sleeve head body and the sleeve head flange fixedly disposed on the top of the sleeve head body are characterized in that the clamping device includes: a driving mechanism and a chuck disposed in the flange hole of the sleeve head flange and whose lower surface engages with the wedge-shaped slips, wherein the inner wall of the chuck is uniformly provided with a plurality of grooves along the circumference, and the driving mechanism is disposed inside the grooves. The drive mechanism includes: a locking tooth disposed in the groove along the outer periphery of the sleeve, a piston rod with its first end connected to the side of the locking tooth away from the sleeve, and a piston cylinder connected to the second end of the piston rod, the piston cylinder being connected to a grease injection mechanism for injecting grease into it.

2. A clamp for a wellhead spool as defined in claim 1, characterized in that The chuck and the sleeve head flange are connected by a chuck anti-drop mechanism. The chuck anti-drop mechanism includes: a fixed pressure plate disposed on the upper surface of the chuck, a pressure rod that vertically passes through the fixed pressure plate and enters the accommodating space of the chuck, and an elastic element sleeved on the outer periphery of the pressure rod. The fixed pressure plate is fixedly connected to the sleeve head flange.

3. A clamp for a wellhead spool as defined in claim 2, wherein, The elastic element is disposed within the accommodating space, with its bottom end connected to the bottom end of the pressure rod and its top end connected to the chuck to form the top inner wall of the accommodating space.

4. A clamp for a wellhead spool as defined in claim 3, wherein, The accommodating space extends from the lower surface of the chuck into the interior of the chuck, and the chuck anti-drop mechanism further includes: an elastic pressure plate fixedly disposed on the lower surface of the chuck and closing the bottom of the accommodating space.

5. A clamp for a wellhead spool as defined in claim 4, wherein, The pressure bar is constructed in a T-shape, with its bottom end set in the accommodating space and in contact with the elastic pressure plate, and its top end fixedly connected to the fixed pressure plate. The area of ​​the bottom end of the pressure bar is larger than the area of ​​the top end.

6. A fixture for a wellhead casing head according to claim 1 or 2, characterized in that The grease injection mechanism includes a hydraulic cylinder assembly and a grease injection chamber connected to the output end of the hydraulic cylinder assembly. The grease injection chamber is connected to the inlet end of a one-way valve via a first hose, and the outlet end of the one-way valve is connected to the piston cylinder via a pipeline assembly.

7. A clamp for a wellhead spool as defined in claim 6, wherein, The casing head flange has a connecting groove inside. The pipeline assembly includes: a grease injection hose disposed on the outer periphery of the wellhead casing head, a hard tube inside a disc disposed in the connecting groove and connected at its first end to the grease injection hose, and a second hose whose first end is connected to the second end of the hard tube inside the disc. The second end of the second hose is connected to the piston cylinder.

8. A clamp for a wellhead spool as defined in claim 7, wherein, The grease injection hose is constructed in a circular shape, with one connecting four-way valve and multiple connecting three-way valves evenly arranged on it. One port of each connecting four-way valve and connecting three-way valve is connected to the rigid tube inside the disc, and one port of the connecting four-way valve is connected to the grease injection mechanism through the one-way valve.

9. A fixture for a wellhead casing head according to claim 1 or 2, characterized in that The chuck is constructed in a ring shape.

10. The clamp for wellhead casing head according to claim 9, characterized in that, The lower surface of the chuck is provided with a T-shaped groove, and a wedge-shaped slip is engaged in the T-shaped groove.

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