A wellhead

Abstract

The utility model provides a kind of wellhead, comprising: connecting pipe body, the center pipe being arranged in the inside of connecting pipe body and the accommodating cavity being arranged at the bottom end of center pipe and being communicated with it, accommodating cavity is communicated with infusion pipeline for conveying liquid, the annulus formed between the inner wall of connecting pipe body and the outer wall of center pipe, the annulus is communicated with gas transmission pipeline for conveying gas, the top of connecting pipe body is connected with casing pipe.The utility model can simplify wellhead structure, while reducing the height of wellhead, is favorable to carry out any wellhead replacement practical training including rooting operation practical training.

Description

Technical Field

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

[0002] Wellhead blowouts are usually accompanied by damage to the original wellhead control equipment, necessitating wellhead relocation. This involves removing the damaged wellhead and reinstalling a new wellhead control equipment. Depending on whether the bottom flange of the original wellhead is damaged, wellhead relocation is divided into emergency installation of a new wellhead and wellhead anchoring. Anchoring refers to re-establishing a bottom flange face on the outgoing casing when the bottom flange is damaged or no longer exists, and then installing the new wellhead. The entire process requires the use of a rotary drilling rig to lift the wellhead relocation equipment. Wellhead relocation training is a specialized daily training program for well control emergency personnel to prepare for wellhead blowouts.

[0003] Wellhead relocation training requires simulating oil and gas combustion and pressurized operations at a blowout site. It typically uses a conventional wellhead for practical simulation. A conventional wellhead includes a casing head and a tubing head located on top of the casing head. The casing head and tubing head are connected by a flange. Both the casing head and tubing head have two wings on their sides (the wings of the casing head are used to transport water and oil, and the wings of the tubing head are used to transport gas). This results in a complex overall wellhead structure and a relatively high overall height, which limits the lifting stroke of rotary drilling rigs and is not conducive to conducting wellhead relocation training. Utility Model Content

[0004] One objective of this invention is to propose a wellhead design that simplifies the wellhead structure and reduces the height of the wellhead, thereby facilitating any wellhead relocation training, including rooting operation training.

[0005] According to this utility model, a wellhead is provided, comprising: a connecting pipe body, a central pipe disposed inside the connecting pipe body, and a receiving cavity disposed at the bottom end of the central pipe and communicating therewith, the receiving cavity being connected to a liquid delivery pipeline for conveying liquid, an annulus being formed between the inner wall of the connecting pipe body and the outer wall of the central pipe, the annulus being connected to a gas delivery pipeline for conveying gas, and a casing being connected to the top of the connecting pipe body.

[0006] In a preferred embodiment, the bottom end of the connecting tube is provided with a step extending inward, and the bottom end of the central tube is fixedly disposed on the step.

[0007] In a preferred embodiment, the steps are configured as a ring.

[0008] In a preferred embodiment, the receiving cavity is configured as a cylinder with an open top, and its inner diameter is the same as that of the central tube.

[0009] In a preferred embodiment, the wellhead further includes: a main body, wherein the step and the receiving cavity are integrated inside the main body, and the connecting pipe includes: a first pipe segment integrated inside the main body and a second pipe segment connected to the first pipe segment, wherein the second pipe segment extends out of the upper surface of the main body.

[0010] In a preferred embodiment, the step is integrally formed with the second pipe segment.

[0011] In a preferred embodiment, the infusion line includes a first channel and a second channel communicating with the interior of the receiving cavity, the first channel and the second channel being disposed opposite to each other.

[0012] In a preferred embodiment, the gas pipeline includes a third channel and a fourth channel communicating with the interior of the first pipe section, the third channel and the fourth channel being disposed opposite to each other, and the first channel, the second channel, the third channel and the fourth channel surrounding the outer periphery of the main body.

[0013] In a preferred embodiment, an atomizing nozzle is provided at the top of the central tube.

[0014] In a preferred embodiment, the second pipe section is provided with internal threads and external threads on its inner and outer walls, respectively.

[0015] This utility model has at least the following technical effects: According to this utility model, a connecting pipe body, a central pipe disposed inside the connecting pipe body, and a receiving cavity disposed at the bottom end of the central pipe and communicating with it are provided. The receiving cavity is connected to a liquid delivery pipeline for conveying liquid. An annulus is formed between the inner wall of the connecting pipe body and the outer wall of the central pipe, and this annulus is connected to a gas delivery pipeline for conveying gas. The top of the connecting pipe body is connected to a casing. The entire wellhead does not require a casing head and a tubing head, and without affecting the wellhead function, the pipelines for conveying gas and the pipelines for conveying liquid are concentrated, thereby simplifying the wellhead structure and reducing the height of the wellhead, which is beneficial for carrying out any wellhead resetting training, including rooting operation training. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of a wellhead according to an embodiment of the present invention is shown. Figure 2 A schematic cross-sectional view of a wellhead 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 2 As shown, this utility model provides a wellhead 100 comprising: a connecting pipe body 2, a central pipe 6 disposed inside the connecting pipe body 2, and a receiving cavity 7 disposed at the bottom end of the central pipe 6 and communicating therewith. Both the central pipe 6 and the connecting pipe body 2 are vertically arranged. The receiving cavity 7 is connected to a liquid delivery pipeline for transporting liquid. An annular space is formed between the inner wall of the connecting pipe body 2 and the outer wall of the central pipe 6, and this annular space is connected to a gas delivery pipeline for transporting gas. A casing (not shown in the figure) is connected to the top of the connecting pipe body 2.

[0022] The following is a brief description of the usage process of the wellhead 100 described in this utility model. First, connect and tighten the connecting pipe body 2 to the casing. Then, open the valve 3 on the gas pipeline and perform remote ignition. After the fire stabilizes, open the liquid pipeline so that the fuel is fully dispersed in the natural gas after passing through the atomizing nozzle and carried by the high-speed natural gas to the casing outlet for combustion, simulating a blowout ignition state. Then, perform wellhead resetting and anchoring operations. After the wellhead resetting device is locked and in normal working condition, pressure testing can be carried out. During the pressure testing operation, close all valves 3.

[0023] According to this utility model, a connecting pipe body 2, a central pipe 6 disposed inside the connecting pipe body 2, and a receiving cavity 7 disposed at the bottom end of the central pipe 6 and communicating with it are provided. The receiving cavity 7 is connected to a liquid delivery pipeline for transporting liquid. An annulus is formed between the inner wall of the connecting pipe body 2 and the outer wall of the central pipe 6, and this annulus is connected to a gas delivery pipeline for transporting gas. The top of the connecting pipe body 2 is connected to a casing. The entire wellhead does not require a casing head and a tubing head, and without affecting the wellhead function, the pipelines for transporting gas and the pipelines for transporting liquid are concentrated, thereby simplifying the wellhead structure and reducing the height of the wellhead, which is beneficial for carrying out any wellhead resetting training, including rooting operation training.

[0024] In one or more embodiments, the bottom end of the connecting tube 2 is provided with a step 21 extending inward, and the bottom end of the central tube is fixedly disposed on the step 21, which is configured as an annular shape. Optionally, the bottom end of the central tube 6 is fixedly disposed on the step 21 by threads. The receiving cavity 7 is configured as a cylinder with an open top, and the inner diameter of the receiving cavity 7 is the same as the inner diameter of the central tube.

[0025] In one or more embodiments, the wellhead 100 of this utility model further includes: a main body 4, a step 21, and a receiving cavity 7, all integrated inside the main body; the connecting pipe 2 includes: a first pipe segment 41 integrated inside the main body 4 and a second pipe segment 42 connected to the first pipe segment 41, the second pipe segment 42 being disposed above the first pipe segment 41 and extending beyond the upper surface of the main body 41. Optionally, the second pipe segment 42 is connected to the first pipe segment 41 via a flange, thereby facilitating the replacement of the second pipe segment 42; the first pipe segment 41 and the step 21 are integrally formed.

[0026] In one or more embodiments, the fluid delivery pipeline includes: a first channel a and a second channel b communicating with the interior of the receiving cavity 7, the first channel a and the second channel b being arranged opposite each other, and the first channel a and the second channel b being used to deliver oil or water. The gas delivery pipeline includes: a third channel c and a fourth channel d communicating with the interior of the first pipe section 41, the third channel c and the fourth channel d being arranged opposite each other, and both the third channel c and the fourth channel being used to deliver natural gas. The first channel a, the second channel b, the third channel c, and the fourth channel d surround the outer periphery of the main body 4, thereby making the wellhead more compact. Valves 3 are provided on the first channel a, the second channel b, the third channel c, and the fourth channel d; optionally, the valves 3 are high-pressure gate valves.

[0027] In one or more embodiments, an atomizing nozzle 1 is provided at the top of the central tube 6. By providing the atomizing nozzle 1, the diffusion area of ​​the liquid can be increased.

[0028] In one or more embodiments, the second pipe section 42 of the connecting pipe body 2 is provided with internal threads and external threads on its inner and outer walls, respectively, and both internal and external threads can be used to connect sleeves. This allows for the application of different types of sleeves.

[0029] In one or more embodiments, the wellhead of the present invention further includes a base 5 connected to the bottom end of the main body 4.

[0030] 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 wellhead, characterized in that, include: The system includes a connecting tube body, a central tube disposed inside the connecting tube body, and a receiving cavity disposed at the bottom end of the central tube and communicating with it. The receiving cavity is connected to a liquid delivery pipeline for conveying liquid. An annular space is formed between the inner wall of the connecting tube body and the outer wall of the central tube. The annular space is connected to a gas delivery pipeline for conveying gas. A connecting sleeve is attached to the top of the connecting tube body.

2. The wellhead according to claim 1, characterized in that, The bottom end of the connecting pipe is provided with a step extending inward, and the bottom end of the central pipe is fixedly disposed on the step.

3. The wellhead according to claim 2, characterized in that, The steps are constructed in a ring shape.

4. The wellhead according to claim 3, characterized in that, The receiving cavity is constructed as a cylinder with an open top, and its inner diameter is the same as that of the central tube.

5. The wellhead according to any one of claims 2 to 4, characterized in that, Also includes: The main body, the steps and the receiving cavity are all integrated inside the main body, and the connecting pipe includes: a first pipe segment integrated inside the main body and a second pipe segment connected to the first pipe segment, the second pipe segment extending out of the upper surface of the main body.

6. The wellhead according to claim 5, characterized in that, The step is integrally formed with the second pipe section.

7. The wellhead according to claim 5, characterized in that, The infusion line includes a first channel and a second channel communicating with the interior of the receiving cavity, wherein the first channel and the second channel are disposed opposite to each other.

8. The wellhead according to claim 7, characterized in that, The gas pipeline includes a third channel and a fourth channel that communicate with the interior of the first pipeline section. The third channel and the fourth channel are arranged opposite to each other, and the first channel, the second channel, the third channel and the fourth channel surround the outer periphery of the main body.

9. The wellhead according to claim 1 or 2, characterized in that, An atomizing nozzle is installed at the top of the central tube.

10. The wellhead according to claim 5, characterized in that, The second pipe section has internal and external threads on its inner and outer walls, respectively.

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