Wellhead casing head

Abstract

The invention discloses a wellhead casing head, and relates to the technical field of mining equipment, the wellhead casing head comprises a main body, the inner wall of the main body is provided with a protective cylinder, the inner wall of the protective cylinder is provided with a sealing assembly, the inner cavity of the protective cylinder is provided with a pipeline, and the end part of the pipeline is sealed through the sealing assembly; according to the wellhead casing head, when the movable cylinder moves, a pressing block arranged on the inner wall of the movable cylinder is synchronously driven to move, the pressing block is composed of two protection blocks, the protection blocks are installed on the inner wall of the movable cylinder in a sliding mode, meanwhile, one protection block is fixedly arranged on the inner wall of the movable cylinder, and the other protection block is connected with the end of a second elastic piece. And when the movable cylinder moves, the protection block slidably mounted in the movable cylinder is synchronously driven to move and is matched with the second elastic piece to extrude the rubber ring, so that the rubber ring moves towards the middle position and is tightly pressed on the outer surface of the pipeline at the same time, and multi-section sealing protection on the outer surface of the pipeline is achieved.

Description

Technical Field

[0001] The invention relates to mining equipment technology, in particular to a wellhead casing head. Background Art

[0002] The casing head is used to fix the wellhead of the drilled well, connect the wellhead casing string, support the gravity of the technical casing and the oil layer casing, seal the annular space between the layers of pipes, provide a transition connection for the installation of the blowout preventer, tubing head, and Christmas tree, and through the two side ports on the casing head body, operations such as squeezing mud, monitoring and adding balancing fluid can be carried out.

[0003] The Chinese invention patent with publication number CN116498246B discloses a wellhead casing head, which is moved toward the inside of the rotating port by squeezing the block by the hanger. When the block continues to collapse, the square rod is transferred to the inside of the recess of the bite tooth block. Since the bite tooth block can rotate freely inside the block, when the annular piston is under the action of the elastic potential energy provided by the spring compressed above and always presses the outer end of the block downward, the block will rotate with the bite tooth block and the square rod combination as the axis. When the block is in a vertical state inside the rotating port due to rotation after being triggered, the annular piston can be quickly pushed to the bottom of the air cavity after losing the obstruction of the block, so that the air at the bottom of the air cavity is compressed and quickly discharged from the air outlet. The surface of the boss can be cleaned by the high-pressure gas discharged from the air outlet, so that the surface of the boss is cleaned before it is tightly matched with the hanger, and finally the sealing performance between the boss and the hanger is guaranteed.

[0004] When the existing equipment is in use, the casing joints have weak bearing capacity and are easily damaged or have gaps with the oil well pipe after long-term use, causing oil and gas leakage. At the same time, the casing head may experience greater mechanical stress or vibration during operation, especially under high-load operations or large fluctuations in downhole pressure, which may cause the seal to be damaged due to stress concentration or deformation. Therefore, a wellhead casing head has been developed. Summary of the invention

[0005] The purpose of the present invention is to provide a wellhead casing head to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a wellhead casing head, comprising a main body, the inner wall of the main body is provided with a protective cylinder, the inner wall of the protective cylinder is provided with a sealing assembly, and the inner cavity of the protective cylinder is provided with a pipeline, and the end of the pipeline is sealed by the sealing assembly;

[0007] Wherein, the sealing assembly comprises a circular ring connected to the inner wall of the protective tube, and a fixing plate is provided at one end of the inner wall of the protective tube away from the circular ring, a supporting ring is provided at the end of the fixing plate, an extrusion block is slidably mounted on the outer surface of the supporting ring, a first elastic member is provided at the end of the extrusion block, and an end of the first elastic member away from the extrusion block is connected to the end of the fixing plate;

[0008] The inner cavity of the protective tube is provided with a sleeve, and movable tubes are slidably mounted on both ends of the outer surface of the sleeve, and the ends of the two movable tubes that are away from each other are respectively connected to the ends of the ring and the fixed plate, and the outer surfaces of the two movable tubes are provided with guide grooves, and the inner walls of the guide grooves are slidably mounted with positioning shafts, and the ends of the positioning shafts are connected to the outer surface of the sleeve;

[0009] The inner wall of the movable cylinder is provided with a pressing block, the inner wall of the pressing block is provided with a rubber ring, and the end of the sleeve is provided with a second elastic member, the end of the second elastic member away from the sleeve is connected to the end of the pressing block, and the inner wall of the rubber ring is in contact with the outer surface of the pipe;

[0010] A protection component is assembled at the lower end of the ring, and the pipeline is further limited by the protection component.

[0011] As a further optimization solution of the present invention, the inner wall of the ring is provided with a screw groove, and the outer surface of the pipe is provided with a corresponding screw thread.

[0012] As a further optimization scheme of the present invention, the protective component includes a docking sleeve connected to the circular ring, the inner cavity of the docking sleeve is provided with a ratchet gear, the lower end of the ratchet gear is rotatably connected to the upper end of the inner wall of the docking sleeve, and one side of the longitudinal section of the docking sleeve is L-shaped.

[0013] As a further optimization solution of the present invention, a push block is rotatably mounted on the inner wall of the docking tube, and the end of the push block is engaged with the outer surface of the ratchet gear.

[0014] As a further optimization solution of the present invention, a telescopic member is provided on the outer surface of the push block, and the end of the telescopic member passes through and extends to the outside of the docking tube, and a stretching block is provided on the end of the telescopic member.

[0015] As a further optimization solution of the present invention, a driving block is disposed at the upper end of the ratchet gear, and a first rotating disk is disposed at the upper end of the driving block.

[0016] As a further optimization solution of the present invention, a plurality of first arc-shaped grooves are formed at the end of the first turntable, and the plurality of first arc-shaped grooves are evenly distributed at the end of the first turntable.

[0017] As a further optimization solution of the present invention, a second turntable is provided on the inner wall of the docking tube and located at the upper end of the first turntable, and the second turntable is provided with a second arc groove corresponding to the first arc groove.

[0018] As a further optimization solution of the present invention, the first arc-shaped grooves and the second arc-shaped grooves are arranged in a staggered manner.

[0019] As a further optimization scheme of the present invention, a movable shaft is slidably installed on the inner wall of the first arc-shaped groove, and the upper end of the outer surface of the movable shaft is slidably connected to the inner wall of the second arc-shaped groove. At the same time, a clamping block is provided at the upper end of the movable shaft, and the inner wall of the clamping block is clamped with the outer surface of the pipe.

[0020] Compared with the prior art, the wellhead casing head provided by the present invention has the following beneficial effects: when the movable cylinder moves, the pressing block arranged on the inner wall thereof is synchronously driven to move, wherein the pressing block is composed of two protective blocks, and the protective blocks are slidably mounted on the inner wall of the movable cylinder, and one of the protective blocks is fixedly mounted on the inner wall of the movable cylinder, and the other protective block is connected to the end of the second elastic member. When the movable cylinder moves, the protective block slidably mounted inside it is synchronously driven to move, and the rubber ring is squeezed in cooperation with the second elastic member, so that the rubber ring moves to the middle position, and at the same time is tightly pressed on the outer surface of the pipeline, so as to realize multi-stage sealing protection of the outer surface of the pipeline and prevent oil and gas leakage.

[0021] When the first rotating disk rotates, the first arc groove synchronously drives the movable shaft to move. Since the outer surface of the movable shaft is limited by the second arc groove, when the first arc groove rotates, the movable shaft is driven to move toward the middle or expand toward the outer surface. When the movable shaft moves, the clamping block arranged at its end is synchronously driven to move, thereby limiting the outer surface of the pipeline, so as to further limit the pipeline, reduce looseness, and avoid damage due to stress concentration or deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of the overall internal structure provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a sealing assembly provided in an embodiment of the present invention;

[0026] Figure 4 A cross-sectional view of the internal structure of a sealing assembly provided by an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the structure of a protection component provided in an embodiment of the present invention;

[0028] Figure 6 A first cross-sectional view of the internal structure of the protection assembly provided by an embodiment of the present invention;

[0029] Figure 7 A second cross-sectional view of the internal structure of the protection component provided by an embodiment of the present invention;

[0030] Figure 8 A third cross-sectional view of the internal structure of the protection component provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Main body; 2. Sealing assembly; 3. Protection assembly; 11. Pipe; 12. Protection cylinder; 21. Circular ring; 22. Fixed plate; 23. Support ring; 24. First elastic member; 25. Extrusion block; 26. Sleeve; 27. Movable cylinder; 271. Guide groove; 272. Positioning shaft; 273. Pressing block; 28. Second elastic member; 29. ​​Rubber ring; 31. Docking cylinder; 32. Ratchet gear; 33. Pushing block; 34. Telescopic member; 341. Stretching block; 35. Driving block; 36. First turntable; 361. First arc groove; 37. Movable shaft; 38. Second turntable; 381. Second arc groove; 39. Clamping block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example: See Figure 1-Figure 8 A wellhead casing head includes a main body 1, an inner wall of the main body 1 is provided with a protective tube 12, and the inner wall of the protective tube 12 is provided with a sealing component 2, and the inner cavity of the protective tube 12 is provided with a pipe 11, and the end of the pipe 11 is sealed by the sealing component 2.

[0036] In this solution, a fixed block is provided on the outer surface of the protective tube 12, which is connected to the inner wall of the main body 1 through the fixed block. At the same time, a moving gap is reserved between the protective tube 12 and the main body 1, and the outlet pipe connected to the main body 1 is used to release the internal pressure. The end of the outlet pipe is provided with a pressure relief valve or other components with pressure relief function.

[0037] Furthermore, the sealing assembly 2 includes a circular ring 21 connected to the inner wall of the protective tube 12, and a fixing plate 22 is provided at one end of the inner wall of the protective tube 12 away from the circular ring 21, a supporting ring 23 is provided at the end of the fixing plate 22, an extrusion block 25 is slidably installed on the outer surface of the supporting ring 23, a first elastic member 24 is provided at the end of the extrusion block 25, and the end of the first elastic member 24 away from the extrusion block 25 is connected to the end of the fixing plate 22.

[0038] In this embodiment, the end of the support ring 23 is connected to the inner wall of the pipe 11, and the connection at the lower end of the support ring 23 is made of rubber material, so that when it is connected to the pipe 11, it can be tightly squeezed on the inner wall of the pipe 11 to ensure the overall sealing.

[0039] The outer surfaces of the ring 21 and the fixing plate 22 are both slidably connected to the inner wall of the protective tube 12 .

[0040] At the same time, when the pipe 11 is docked, it is pressed tightly on the extrusion block 25, and the first elastic member 24 is used to support the extrusion block 25. The outer surface of the extrusion block 25 is provided with rubber and other components with sealing function, wherein the first elastic member 24 is a spring and other elastic components. The first elastic member 24 cooperates with the extrusion block 25 to seal the end of the pipe 11, thereby ensuring the stability of the seal.

[0041] Furthermore, the inner cavity of the protective tube 12 is provided with a sleeve 26, and movable tubes 27 are slidably mounted on both ends of the outer surface of the sleeve 26, and the ends of the two movable tubes 27 that are away from each other are respectively connected to the ends of the ring 21 and the fixed plate 22, and the outer surfaces of the two movable tubes 27 are provided with guide grooves 271, and the inner walls of the guide grooves 271 are slidably mounted with positioning shafts 272, and the ends of the positioning shafts 272 are connected to the outer surface of the sleeve 26. The inner wall of the ring 21 is provided with screw grooves, and the outer surface of the pipe 11 is provided with corresponding threads.

[0042] Specifically, when the pipe 11 extends to the inside of the movable cylinder 27, the pipe 11 is initially fixed inside the movable cylinder 27 through the fit between the screw groove and the screw thread, and when the pipe 11 moves, the ring 21 is synchronously driven to move, thereby pushing the movable cylinder 27 arranged at its end to move.

[0043] The movable cylinder 27 is defined by the guide groove 271 and the positioning shaft 272 , so that the movable cylinder 27 remains stable when moving.

[0044] Furthermore, a pressing block 273 is provided on the inner wall of the movable cylinder 27, and a rubber ring 29 is provided on the inner wall of the pressing block 273. At the same time, a second elastic member 28 is provided on the end of the sleeve 26. The end of the second elastic member 28 away from the sleeve 26 is connected to the end of the pressing block 273, and the inner wall of the rubber ring 29 is in contact with the outer surface of the pipe 11.

[0045] Specifically, when the movable cylinder 27 moves, the pressing block 273 arranged on its inner wall is synchronously driven to move, wherein the pressing block 273 is composed of two protective blocks, and the protective blocks are slidably installed on the inner wall of the movable cylinder 27, and one of the protective blocks is fixedly arranged on the inner wall of the movable cylinder 27, and the other protective block is connected to the end of the second elastic member 28, and the second elastic member 28 is an elastic component such as a spring.

[0046] When the movable cylinder 27 moves, it synchronously drives the protective block slidably installed inside it to move, and cooperates with the second elastic member 28 to squeeze the rubber ring 29, so that the rubber ring 29 moves to the middle position and presses tightly on the outer surface of the pipe 11 at the same time, thereby realizing multi-stage sealing protection for the outer surface of the pipe 11.

[0047] Furthermore, the protection assembly 3 is assembled at the lower end of the ring 21, and the pipeline 11 is further limited by the protection assembly 3. The protection assembly 3 includes a docking sleeve 31 connected to the ring 21, and the inner cavity of the docking sleeve 31 is provided with a ratchet gear 32, and the lower end of the ratchet gear 32 is rotatably connected to the upper end of the inner wall of the docking sleeve 31, wherein one side of the longitudinal section of the docking sleeve 31 is L-shaped.

[0048] In this embodiment, since the lower end of the ratchet gear 32 is rotatably connected to the upper end of the inner wall of the docking tube 31, the ratchet gear 32 remains stable during rotation. At the same time, a rotating cylinder is provided on the inner wall of the ratchet gear 32, and the rotating cylinder is extended to the outside of the docking tube 31, and the ratchet gear 32 is driven to rotate synchronously by driving the rotating cylinder.

[0049] Furthermore, a push block 33 is rotatably mounted on the inner wall of the docking tube 31 , and an end of the push block 33 is engaged with an outer surface of the ratchet gear 32 .

[0050] Specifically, the ratchet gear 32 stops after rotating to a suitable position, and the ratchet gear 32 is limited by the push block 33, so that the stability of the ratchet gear 32 is ensured after the ratchet gear 32 rotates.

[0051] Furthermore, a telescopic member 34 is disposed on the outer surface of the push block 33 , and an end of the telescopic member 34 penetrates and extends to the outside of the docking tube 31 , and a stretching block 341 is disposed at the end of the telescopic member 34 .

[0052] Specifically, the telescopic member 34 is composed of a cylinder and a round rod, and the outer surface of the round rod is slidably connected to the inner wall of the cylinder. At the same time, a spring or other elastic component is sleeved on the outer surface of the cylinder, and the end of the spring is connected to the inner wall of the docking tube 31, so that the push block 33 is tightly pressed against the outer surface of the ratchet gear 32 by the spring.

[0053] At the same time, the end of the cylinder is connected to the stretching block 341, so that when the stretching block 341 moves, it can drive the cylinder set on the stretching block 341 to move, thereby separating the push block 33 from the ratchet gear 32, which is convenient for subsequent operations.

[0054] Furthermore, a driving block 35 is disposed at the upper end of the ratchet gear 32 , and a first rotating disk 36 is disposed at the upper end of the driving block 35 .

[0055] Specifically, when the ratchet gear 32 rotates, the driving block 35 provided at the end thereof drives the first rotating disk 36 to rotate, and the first rotating disk 36 rotates synchronously with the ratchet gear 32 .

[0056] Further, the end of the first rotating disk 36 is provided with a plurality of first arc grooves 361, and the plurality of first arc grooves 361 are evenly distributed at the end of the first rotating disk 36. A second rotating disk 38 is provided on the inner wall of the docking tube 31 and located at the upper end of the first rotating disk 36, and the second rotating disk 38 is provided with a second arc groove 381 corresponding to the first arc groove 361. The first arc grooves 361 and the second arc grooves 381 are arranged in a staggered manner.

[0057] Specifically, the outer surface of the second rotating disk 38 is fixedly connected to the inner wall of the docking tube 31, so that when the first rotating disk 36 rotates, the second rotating disk 38 remains stable.

[0058] Furthermore, a movable shaft 37 is slidably installed on the inner wall of the first arc groove 361, and the upper end of the outer surface of the movable shaft 37 is slidably connected to the inner wall of the second arc groove 381. At the same time, a clamping block 39 is provided at the upper end of the movable shaft 37, and the inner wall of the clamping block 39 is clamped to the outer surface of the pipe 11.

[0059] Specifically, when the first turntable 36 rotates, the movable shaft 37 is synchronously driven to move in cooperation with the first arc groove 361. Since the outer surface of the movable shaft 37 is limited by the second arc groove 381, when the first arc groove 361 rotates, the movable shaft 37 is driven to move toward the middle or expand toward the outer surface.

[0060] When the movable shaft 37 moves, the clamping block 39 arranged at the end thereof is synchronously driven to move, so as to limit the outer surface of the pipe 11, so as to further limit the pipe 11 and reduce the looseness.

[0061] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A wellhead casing head, characterized in that: It comprises a main body (1), the inner wall of the main body (1) is provided with a protective tube (12), the inner wall of the protective tube (12) is provided with a sealing assembly (2), and the inner cavity of the protective tube (12) is provided with a pipeline (11), and the end of the pipeline (11) is sealed by the sealing assembly (2); The sealing assembly (2) comprises a circular ring (21) connected to the inner wall of the protective tube (12); a fixing plate (22) is provided at one end of the inner wall of the protective tube (12) away from the circular ring (21); a supporting ring (23) is provided at the end of the fixing plate (22); an extrusion block (25) is slidably mounted on the outer surface of the supporting ring (23); a first elastic member (24) is provided at the end of the extrusion block (25); and an end of the first elastic member (24) away from the extrusion block (25) is connected to the end of the fixing plate (22); The inner cavity of the protective tube (12) is provided with a sleeve (26), and movable tubes (27) are slidably mounted on both ends of the outer surface of the sleeve (26), and the ends of the two movable tubes (27) that are away from each other are respectively connected to the ends of the ring (21) and the fixed plate (22), and the outer surfaces of the two movable tubes (27) are provided with guide grooves (271), and the inner wall of the guide groove (271) is slidably mounted with a positioning shaft (272), and the end of the positioning shaft (272) is connected to the outer surface of the sleeve (26); The inner wall of the movable cylinder (27) is provided with a pressing block (273), the inner wall of the pressing block (273) is provided with a rubber ring (29), and the end of the sleeve (26) is provided with a second elastic member (28), the end of the second elastic member (28) away from the sleeve (26) is connected to the end of the pressing block (273), and the inner wall of the rubber ring (29) is in contact with the outer surface of the pipe (11); A protection component (3) is mounted on the lower end of the ring (21), and the pipeline (11) is further limited by the protection component (3).

2. A wellhead casing head according to claim 1, characterized in that: The inner wall of the circular ring (21) is provided with a screw groove, and the outer surface of the pipe (11) is provided with a corresponding screw thread.

3. A wellhead casing head according to claim 1, characterized in that: The protection component (3) comprises a docking sleeve (31) connected to the circular ring (21), the inner cavity of the docking sleeve (31) is provided with a ratchet gear (32), the lower end of the ratchet gear (32) is rotatably connected to the upper end of the inner wall of the docking sleeve (31), wherein one side of the longitudinal section of the docking sleeve (31) is L-shaped.

4. A wellhead casing head according to claim 3, characterized in that: A push block (33) is rotatably mounted on the inner wall of the docking cylinder (31), and an end of the push block (33) is engaged with the outer surface of the ratchet gear (32).

5. A wellhead casing head according to claim 4, characterized in that: A telescopic member (34) is provided on the outer surface of the push block (33), and the end of the telescopic member (34) penetrates and extends to the outside of the docking tube (31), and a stretching block (341) is provided at the end of the telescopic member (34).

6. A wellhead casing head according to claim 5, characterized in that: A driving block (35) is disposed at the upper end of the ratchet gear (32), and a first rotating disk (36) is disposed at the upper end of the driving block (35).

7. A wellhead casing head according to claim 6, characterized in that: A plurality of first arc-shaped grooves (361) are formed at the end of the first rotating disk (36), and the plurality of first arc-shaped grooves (361) are evenly distributed at the end of the first rotating disk (36).

8. A wellhead casing head according to claim 7, characterized in that: A second rotating disk (38) is provided on the inner wall of the docking tube (31) and located at the upper end of the first rotating disk (36), and the second rotating disk (38) is provided with a second arc groove (381) corresponding to the first arc groove (361).

9. A wellhead casing head according to claim 8, characterized in that: The first arc-shaped grooves (361) and the second arc-shaped grooves (381) are arranged in a staggered manner.

10. A wellhead casing head according to claim 9, characterized in that: A movable shaft (37) is slidably mounted on the inner wall of the first arc-shaped groove (361), and the upper end of the outer surface of the movable shaft (37) is slidably connected to the inner wall of the second arc-shaped groove (381). At the same time, a clamping block (39) is provided at the upper end of the movable shaft (37), and the inner wall of the clamping block (39) is clamped to the outer surface of the pipe (11).

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