Multi-layer sealed casing head suitable for complex well conditions

Abstract

The utility model discloses a multilayer sealed casing head suitable for complex well conditions, which comprises a plurality of sets of casing head outer shells, a sealing flange sleeve head and a plurality of sets of casing hangers, the bottommost ends of the plurality of sets of casing head outer shells are provided with a mounting support base, the inner sides of the plurality of sets of casing hangers are provided with inner material conveying pipes in a penetrating manner, and the inner material conveying pipes are communicated with the sealing flange sleeve head. Assembling sleeve openings are symmetrically and annularly formed in the inner side faces of the middles of the upper ends and the lower ends of the multiple sets of casing head outer shells, sealing connection lock sleeves are embedded between the corresponding positions of the assembling sleeve openings, and a plurality of clamping sleeve heads are annularly embedded in the positions, close to the inner sides of the bottoms of the casing head outer shells, of the two side faces of the sealing connection lock sleeves. The beneficial effects of the utility model are that through the integral clamping assembly and embedding of the clamping magnetic attraction fixing structure, the disassembly and assembly convenience is improved, the quick response, replacement and adjustment are facilitated, and meanwhile, the integral assembly sealing structure also saves the sealing cost, is convenient to disassemble, assemble and clean, and improves the sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of casing heads, in particular to a multi-layer sealed casing head suitable for complex well conditions. Background Art

[0002] The casing head is a special short joint that is connected to the top of the casing string with threads or flanges and is located on the outer casing when drilling on land or at sea. It is used to support and fix the casing string lowered into the well and install the blowout preventer group and other wellhead equipment. It has a complex structure and is widely used in oil and natural gas extraction to ensure safe and stable operation of the wellhead.

[0003] Most of the existing multi-layer sealed casing heads still have some problems when used, especially in complex well conditions. The installation and disassembly of the multi-layer casing head requires disassembly of multiple sets of bolt fixing components from the inside to the outside, which is very complicated and not convenient for rapid response replacement and adjustment, and the use effect is poor. Secondly, the assembly of the multi-layer casing head requires the use of a large number of sealing components to seal the interconnections of the casing head extension flanges, which not only increases the cost, but also easily accumulates pollutants and impurities in complex well conditions, which also increases the inconvenience of subsequent cleaning and reduces the sealing effect.

[0004] To this end, we propose a multi-layer sealed casing head suitable for complex well conditions to solve the above problems. Utility Model Content

[0005] The utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] To this end, the technical solution adopted in this utility model is:

[0007] The cam is provided with a plurality of sealing members, each of which is connected to a base, and the cam is provided with a plurality of sealing members, each of which is connected to a base and a bottom end of the cam.

[0008] In a preferred embodiment, the present invention can be further configured as follows:

[0009] By adopting the above technical solution, one end of the protective spring washer extends and is sleeved on the outside of the threaded lock column, and the magnetic block is adsorbed and fitted with the convex lock block.

[0010] In a preferred embodiment, the present invention can be further configured as follows:

[0011] By adopting the above technical solution, the convex locking block and the clamping sleeve are rotatably locked to each other, and one end of each of the plurality of threaded locking columns is located at the bottom outer side surface of the sleeve head outer shell and is connected to a locking head.

[0012] In a preferred embodiment, the present invention can be further configured as follows:

[0013] By adopting the above technical solution, the top ends of the plurality of casing hangers are respectively mounted on the inner side of the assembly opening opened at the top end of the casing head outer shell and the inner top end of the mounting support base.

[0014] In a preferred embodiment, the present invention can be further configured as follows:

[0015] By adopting the above technical solution, annular sealing gaskets are symmetrically embedded between the upper and lower ends of the sealing connection lock sleeve and the upper end of the assembly sleeve and the top ends of the multiple sets of casing hangers.

[0016] In a preferred embodiment, the present invention can be further configured as follows:

[0017] By adopting the above technical solution, the outer end surface of the sealing flange sleeve is embedded with an adsorption support pad.

[0018] In a preferred embodiment, the present invention can be further configured as follows:

[0019] By adopting the above technical solution, the left ends of the multiple groups of casing head outer shells are all penetrated by the pressure relief valve tube, and the right ends are all penetrated by the injection valve tube.

[0020] By adopting the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0021] 1. The utility model provides a sealed connection lock sleeve, a threaded lock column, a snap-fit ​​sleeve, a convex locking block and a magnetic block. When in use, a sealed connection lock sleeve is embedded between the assembly sleeve openings opened on the inner side of the outer shell of multiple groups of stacked sleeve heads. The convex locking block connected to the threaded lock column is moved through the lock head to engage with the inner side of the snap-fit ​​sleeve, and is fixed by adsorption through the magnetic block, so that the outer shells of multiple groups of sleeve heads are squeezed against each other and fixed. The overall disassembly and assembly is more convenient, which is convenient for quick response to replacement and adjustment, thereby improving the use effect.

[0022] 2. The utility model provides a sealing connection lock sleeve, an annular sealing gasket and an adsorption support pad. When in use, after the multiple sets of casing head outer shells are connected and fixed to each other through the above-mentioned beneficial effect components, the adsorption support pads embedded in the upper and lower ends of the multiple sets of sealing flange sleeves form an extrusion adsorption sealing effect, and cooperate with the sealing connection lock sleeve and the annular sealing gaskets at the upper and lower ends to form a sealing effect inside, which is simple, fast and cost-effective. This integrated separated sealing structure is also convenient for disassembly and cleaning, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view structural diagram of an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of a front cross-sectional structure of an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the local structure of point A of an embodiment of the present utility model.

[0026] Reference numerals:

[0027] 1. Casing head outer shell; 2. Sealing flange sleeve; 3. Injection valve tube; 4. Pressure relief valve tube; 5. Mounting support base; 6. Locking head; 7. Inner feed pipe; 8. Sealing connection locking sleeve; 9. Annular sealing gasket; 10. Adsorption support pad; 11. Threaded locking column; 12. Assembly sleeve; 13. Snap-on sleeve; 14. Magnetic block; 15. Protective spring washer; 16. Convex locking block; 17. Casing hanger. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other unless there is any conflict.

[0029] It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0030] The following describes a multi-layer sealed casing head suitable for complex well conditions, provided by some embodiments of the present invention, with reference to the accompanying drawings.

[0031] Example 1:

[0032] Combine Figure 1-Figure 3 As shown, the utility model provides a multi-layer sealed casing head suitable for complex well conditions.

[0033] Specifically, it includes multiple sets of casing head outer shells 1, sealing flange sleeves 2 and multiple sets of casing hangers 17. The multiple sets of casing hangers 17 are mainly used to hang and install various casing components such as internal material delivery pipes 7. The bottom end of the multiple sets of casing head outer shells 1 is equipped with a mounting support base 5. The inner side of the multiple sets of casing hangers 17 is penetrated by an internal material delivery pipe 7. The internal material delivery pipe 7 is mainly used to facilitate the transportation of materials. The inner side surfaces of the upper and lower middle ends of the multiple sets of casing head outer shells 1 are symmetrically annularly opened with assembly sleeves 12. The corresponding positions of the assembly sleeves 12 are embedded with sealed connection lock sleeves 8. The sealed connection The two sides of the locking sleeve 8 are annularly embedded with multiple snap-fit ​​sleeves 13 near the bottom inner side of the casing head outer shell 1. The snap-fit ​​sleeve 13 and the convex locking block 16 are both made of high-chromium cast iron, which has high wear resistance and toughness, and has high temperature resistance and corrosion resistance. The tightness can be maintained stable when operating in complex well conditions. The bottom of the casing head outer shell 1 is close to the inclined surface of the sealing flange sleeve 2 and is penetrated by multiple threaded locking columns 11. One end of the multiple threaded locking columns 11 is located on the inner side of the multiple snap-fit ​​sleeves 13 and is connected to the convex locking block 16. The inner side of the snap-fit ​​sleeve 13 is embedded with The protective spring washer 15 is mainly used to protect and seal the card sleeve 13, the threaded locking column 11 and the convex locking block 16. The inner side of the protective spring washer 15 and the extended outer side of the convex locking block 16 are connected with a magnetic block 14. One end of the protective spring washer 15 extends and is sleeved on the outer side of the threaded locking column 11. The magnetic block 14 and the convex locking block 16 are adsorbed and fit. The convex locking block 16 and the card sleeve 13 are rotated and clamped with each other. One end of the multiple threaded locking columns 11 is located at the bottom outer side of the casing head outer shell 1 and is connected to the lock head 6. The top of the multiple groups of casing hangers 17 are divided into The sealing connection locking sleeve 8 is embedded between the assembly sleeve 12 opened on the inner side of the top of the casing head outer shell 1 and the inner top of the installation support base 5. The above-mentioned components are separately mounted on the inner side of the assembly sleeve 12 opened on the inner side of the casing head outer shell 1 of multiple groups of stacked casing head outer shells. The convex locking block 16 connected to the threaded lock column 11 is moved through the locking head 6 to be snapped into the inner side of the snap-fit ​​sleeve 13 on the side of the connecting locking sleeve 8. The magnetic block 14 is adsorbed and fixed, so that the multiple groups of casing head outer shells 1 are squeezed against each other and fixed, making the overall disassembly and assembly more convenient and convenient for quick response to replacement and adjustment.

[0034] Example 2:

[0035] Combine Figure 2 As shown, based on the first embodiment,

[0036] Specifically, annular sealing gaskets 9 are symmetrically embedded between the upper and lower ends of the sealing connection locking sleeve 8 and the upper end of the assembly sleeve 12 and the top of the multiple sets of casing hangers 17, and the outer end faces of the sealing flange sleeves 2 are embedded with adsorption support pads 10. With the use of the above-mentioned components and the components in Example 1, after the multiple sets of casing head outer shells 1 are connected and fixed to each other, the adsorption support pads 10 embedded at the upper and lower ends of the multiple sets of sealing flange sleeves 2 form an extrusion adsorption sealing effect, and cooperate with the sealing connection locking sleeve 8 and the annular sealing gaskets 9 at the upper and lower ends to form a sealing effect inside, which is simple, fast and reduces costs. At the same time, the overall separation sealing structure is also convenient for disassembly and cleaning, thereby improving the sealing effect.

[0037] Combine Figure 1 and Figure 2 As shown, in the above embodiment,

[0038] Specifically, the left ends of the multiple groups of casing head outer shells 1 are all installed with pressure relief valve pipes 4, which are mainly used to discharge part of the accumulated pressure to the outside to improve safety in use, and the right ends are all installed with injection valve pipes 3, which are mainly used to facilitate the injection of various liquids, such as well-killing fluid or fire extinguishing agent, for emergency use.

[0039] The working principle and usage process of the present invention are as follows: First, when in use, the sealing connection locking sleeves 8 are embedded between the assembly sleeves 12 opened on the inner side of the outer shell of the multiple stacked sleeve heads 1, and the convex locking blocks 16 connected to the threaded lock cylinders 11 are toggled and buckled with the inner side of the snap-fit ​​sleeve 13 through the locking head 6, and are fixed by adsorption through the magnetic block 14, so that the multiple sleeve head outer shells 1 are squeezed against each other and fixed. When disassembling, the operation is reversed, and the overall disassembly and assembly is more convenient, which is convenient for quick response to replacement and adjustment, and improves the use effect. Secondly, when in use, after the multiple sleeve head outer shells 1 are connected and fixed to each other through the use of the above-mentioned components, the adsorption support pads 10 embedded at the upper and lower ends of the multiple sealing flange sleeves 2 form an extrusion and adsorption sealing effect, and cooperate with the sealing connection locking sleeves 8 and the annular sealing gaskets 9 at the upper and lower ends to form a sealing effect inside, which is simple, fast, and cost-effective. This integrated separated sealing structure is also convenient for disassembly and cleaning, and improves the sealing effect.

[0040] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-layer sealed casing head suitable for complex well conditions, comprising multiple sets of casing head outer shells (1), sealing flange sleeves (2) and multiple sets of casing hangers (17), wherein the bottom ends of the multiple sets of casing head outer shells (1) are equipped with mounting support bases (5), and the inner sides of the multiple sets of casing hangers (17) are provided with inner feed pipes (7) running through them, characterized in that: The inner side surfaces of the middle parts of the upper and lower ends of the multiple groups of the sleeve head outer shells (1) are symmetrically annularly provided with assembly sleeves (12), and the corresponding parts of the assembly sleeves (12) are embedded with sealing connection lock sleeves (8), and the two side surfaces of the sealing connection lock sleeves (8) are annularly embedded with multiple clamping sleeves (13) near the inner side of the bottom of the sleeve head outer shell (1), and the bottom of the multiple sleeve head outer shells (1) are close to the inclined surface of the sealing flange sleeve (2) and are penetrated by multiple threaded locking columns (11). One end of the multiple threaded locking columns (11) is located on the inner side of the multiple clamping sleeves (13) and is connected to a convex locking block (16). The inner side of the clamping sleeve (13) is embedded with a protective spring washer (15), and the inner side of the protective spring washer (15) is connected to the extended outer side of the convex locking block (16) at abutment with a magnetic suction block (14).

2. The multi-layer sealed casing head suitable for complex well conditions according to claim 1, characterized in that: One end of the protective spring pad (15) extends and is sleeved on the outside of the threaded locking column (11), and the magnetic block (14) is adsorbed and fitted with the convex locking block (16).

3. The multi-layer sealed casing head suitable for complex well conditions according to claim 1, characterized in that: The convex locking block (16) and the clamping sleeve (13) are rotatably locked to each other, and one end of each of the plurality of threaded locking columns (11) is located on the bottom outer side surface of the sleeve head outer shell (1) and is connected to a locking head (6).

4. The multi-layer sealed casing head suitable for complex well conditions according to claim 1, characterized in that: The top ends of the plurality of sets of casing hangers (17) are respectively mounted on the inner side of the assembly sleeve opening (12) opened at the top end of the casing head outer shell (1) and the inner top end of the mounting support base (5).

5. The multi-layer sealed casing head suitable for complex well conditions according to claim 1, characterized in that: Annular sealing gaskets (9) are symmetrically embedded between the upper and lower ends of the sealing connection lock sleeve (8) and the upper end of the assembly sleeve (12) and the top ends of the multiple sets of casing hangers (17).

6. The multi-layer sealed casing head suitable for complex well conditions according to claim 1, characterized in that: The outer end surfaces of the sealing flange sleeves (2) are all embedded with adsorption support pads (10) that are clamped thereon.

7. The multi-layer sealed casing head suitable for complex well conditions according to claim 1, characterized in that: The left ends of the multiple groups of casing head outer shells (1) are all penetrated by a pressure relief valve tube (4), and the right ends are all penetrated by a material injection valve tube (3).

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