Protective gas filling tool for composite steel pipe welding

Abstract

The invention relates to the field of oil and gas exploitation, in particular to a protective gas filling tool for composite steel pipe welding. The protective gas filling tool for composite steel pipe welding comprises a protective gas circulation piece and two blocking sealing pieces, an airflow cavity channel is formed in the protective gas circulation piece, and the two blocking sealing pieces are assembled at the two ends of the protective gas circulation piece at intervals; an air inflation hole communicated with an air flow cavity channel in the protective gas circulation piece is formed in the position, corresponding to the position between the two blocking sealing pieces, of the surface of the protective gas circulation piece, the protective gas circulation piece is provided with an air inlet connector and an air outlet which are communicated with the air flow cavity channel in the protective gas circulation piece, and the air outlet is provided with a valve. The protective gas filling device has the advantages of being simple and reasonable in structural design, and filling of a small amount of protective gas in a short distance is achieved by adopting a pipeline inner wall blocking mode. The tool is simple in on-site filling implementation, short in construction preparation time and capable of rapidly placing the device in place, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of oil and gas exploitation, and in particular to a composite steel pipe welding protective gas filling tool. Background Art

[0002] With the continuous improvement of the understanding of oil reservoirs during the development of oil fields, the development methods are becoming more and more diverse. Common production-increasing measures such as fracturing and acidizing are increasingly being used, and the types of chemical agents used are becoming more and more abundant, resulting in the complex content and types of crude oil, natural gas and other media produced. Therefore, ground gathering and transportation pipelines, especially those from a single well to a gathering and transportation station, face a variety of corrosive factors, such as: salts dissolved in water (such as halides, sulfates, carbonates, etc.), gases (oxygen, carbon dioxide, hydrogen sulfide, etc.) and bacteria (such as sulfate-reducing bacteria, iron bacteria, etc.) are the main causes of corrosion. At the same time, in the process of gathering and transportation, due to the changeable flow state of the fluid and the combined effect of corrosive media, the ground pipeline is subjected to diversified corrosion. In order to solve the above problems faced by the gathering and transportation pipelines, bimetallic composite pipes came into being, and their unique structure can not only ensure the corrosion resistance of the inner wall of the pipeline, but also ensure certain mechanical properties and standard anti-corrosion methods for the outer wall metal layer, so that it meets the needs of oil field users. This bimetallic composite pipe has been used to a certain extent in the process of oil field development due to its good cost performance. During the on-site welding of this bimetallic composite pipe, the corrosion-resistant alloy layer generally needs to be welded by gas shielding (argon gas) welding, while the ordinary steel pipe layer can be welded by arc welding. During the installation process, the welding of the corrosion-resistant alloy layer is an effective guarantee for the reliable operation of the pipeline. At present, some temporary manual methods are used during welding, and the efficiency and reliability of the gas shielding device will affect the final welding results.

[0003] Patent CN202310577260.4 is an adjustable argon-filled protection device and protection method for the inner side weld of a pipeline. This patent is a tool and method for the inner side welding protection of argon arc welding. The biggest problem is that when welding the gathering and transportation pipeline in the oil field, a support rod of sufficient length is required, and the filling time and filling amount of argon are large. When welding the composite pipeline of the gathering and transportation pipeline in the oil field, the construction preparation time will be long and the construction efficiency will be low.

[0004] Based on this, it is necessary to develop a new composite steel pipe welding protective gas filling tool. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a composite steel pipe welding protective gas filling tool, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A composite steel pipe welding protective gas filling tool comprises a protective gas circulation component and a barrier seal, the protective gas circulation component has an airflow cavity inside, two barrier seals are provided and are installed at intervals at both ends of the protective gas circulation component, the surface of the protective gas circulation component corresponding to the portion between the two barrier seals is provided with an inflation hole connected to its internal airflow cavity, the protective gas circulation component is provided with an air inlet joint and an air vent connected to its internal airflow cavity, and the air vent is provided with a valve.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the protective gas circulation member is a long straight pipe.

[0010] Furthermore, the above-mentioned inflation hole is provided in plurality.

[0011] Furthermore, the plurality of the above-mentioned air filling holes are distributed on the surface of the above-mentioned protective gas circulation member at intervals in a spiral shape.

[0012] Furthermore, the barrier seal comprises two annular sealing plates and a flexible sealing ring sandwiched between the two sealing plates, and the sealing plates are coaxially fixed outside the protective gas circulation member.

[0013] Furthermore, the sealing ring is a polyurethane ring or a rubber ring.

[0014] Furthermore, the above-mentioned valve is a constant pressure air release valve.

[0015] Furthermore, a dragging portion is provided at any one end or both ends of the protective gas circulation member.

[0016] Furthermore, the dragging portion is a U-shaped or annular component.

[0017] Furthermore, the towing part is connected with a towing rope.

[0018] The beneficial effects of the present invention are: the structural design is simple and reasonable, and a small amount of protective gas can be filled in a short distance by using the inner wall of the pipeline for blocking. The on-site filling of the tool is simple to implement, the construction preparation time is short, the device can be quickly put in place, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural cross-sectional view of a composite steel pipe welding protective gas filling tool of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a barrier seal in a composite steel pipe welding protective gas filling tool of the present invention;

[0021] Figure 3It is a structural schematic diagram of a constant-pressure air release valve in a composite steel pipe welding protective gas filling tool of the present invention.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1. Protective gas circulation parts; 2. Barrier seals; 11. Inflation holes; 12. Drag parts; 13. Inlet connectors; 14. Vents; 21. Sealing plates; 22. Sealing rings. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] Example: Figure 1 As shown, the composite steel pipe welding protective gas filling tool of this embodiment includes a protective gas circulation member 1 and a barrier seal 2. The protective gas circulation member 1 has an air flow cavity inside. Two barrier seals 2 are provided and are installed at intervals at both ends of the protective gas circulation member 1. The surface of the protective gas circulation member 1 is provided with an inflation hole 11 connected to its internal air flow cavity corresponding to the portion between the two barrier seals 2. The protective gas circulation member 1 is provided with an air inlet joint 13 and an air vent 14 connected to its internal air flow cavity. The air vent 14 is provided with a valve (represented by H in the figure).

[0026] The construction process is as follows:

[0027] The combined tool is dragged or pushed to the pipe end of the composite pipe A to be welded, and when it is matched with the port of another composite pipe B, the weld C to be welded formed between the composite pipe A and the composite pipe B is manually placed between the two barrier seals 2 (that is, the two barrier seals 2 are respectively connected to the inner walls of the composite pipe A and the composite pipe B, and are respectively in sealing contact with the inner walls of the composite pipe A and the composite pipe B). At this time, the cavity between the two barrier seals 2 forms a protective gas filling cavity. Next, the air inlet connector 13 is connected to the protective gas The protective gas is sent into the protective gas flow part 1 through a conveying pipeline, and released into the protective gas filling chamber through the inflation hole 11 on the surface of the protective gas flow part 1. At the same time, the weld to be welded formed between the composite pipe A and the composite pipe B is welded from the inside out. After the welding is sealed, the protective gas filling chamber can be depressurized to a certain extent through the valve at the vent 14 on the protective gas flow part 1. After the weld is completely welded, the entire tool can be pushed, pulled or dragged from the pipeline to leave the welding position. The structural design of the entire tool is simple and reasonable. It adopts the method of blocking the inner wall of the pipeline to achieve the filling of a small amount of protective gas within a relatively short distance. The on-site filling of the tool is simple to implement, the construction preparation time is short, the device can be quickly put in place, and the work efficiency is improved.

[0028] In this embodiment, the protective gas used is argon.

[0029] As a preferred embodiment, the protective gas circulation member 1 is a long straight pipe.

[0030] In the above-mentioned embodiment, the protective gas circulation member 1 adopts a long straight pipe with a simple structure, which is easy to assemble and use, and the cost of consumables is also reduced.

[0031] Generally, the outer diameter of the protective gas flow member 1 is φ25.4 mm, the inner diameter is φ20 mm, and the total length is 500 mm.

[0032] In this embodiment, the protective gas circulation member 1 is a long straight metal pipe, both ends of which are closed, and an air inlet connector 13 is connected to one end (one end), and a vent 14 is provided on the outer surface of the other end.

[0033] As a preferred embodiment, the above-mentioned inflation hole 11 is provided in plurality.

[0034] In the above embodiment, the design of multiple filling holes 11 enables the protective gas to be quickly released into the protective gas filling cavity through the multiple filling holes 11 after entering the protective gas circulation component 1, which invisibly shortens the efficiency of filling the protective gas in the initial stage, that is, shortens the construction time.

[0035] In this embodiment, a φ5 mm circular hole (that is, the filling hole 11) is processed at a distance of 98.75 mm from one end of the protective gas circulation component 1. The hole is distributed along the length direction of the protective gas circulation component 1, and the plurality of filling holes 11 are distributed in a spiral shape along the length direction of the protective gas circulation component 1. The spiral angle is 90°, and the designed number of the filling holes 11 is 7.

[0036] As a preferred embodiment, Figure 2 As shown, the barrier seal 2 comprises two annular sealing plates 21 and a flexible sealing ring 22 sandwiched between the two sealing plates 21 . The sealing plates 21 are coaxially fixed to the outside of the protective gas circulation component 1 .

[0037] In the above embodiment, the sealing plates 21 are fixed at both ends of the outer periphery of the protective gas circulation member 1 by welding, and the two sealing plates 21 are spaced apart along the long axis direction of the protective gas circulation member 1, and the sealing ring 22 is clamped and fixed between the two sealing plates 21, and the outer diameter of the sealing ring 22 is larger than the outer diameter of the sealing plate 21, and the sealing ring 22 is in contact with the inner wall of the protective gas circulation member 1 to achieve mutual sealing. More specifically, the outer diameter of the sealing ring 22 is slightly larger than the inner diameter of the protective gas circulation member 1, and when the protective gas circulation member 1 is in the composite pipe A and the composite pipe B, the sealing ring 22 itself is "interference fit" with the inner wall of the composite pipe A and the composite pipe B, and the sealing ring 22 is deformed to a certain extent and tightly squeezed on the inner wall of the pipe, ensuring that when the chamber between the two barrier seals 2 is filled with protective gas, no leakage will occur from the sealing ring 22, and the sealing performance is better.

[0038] In this embodiment, the sealing ring 22 is a polyurethane ring or a rubber ring.

[0039] In this embodiment, the two sealing plates 21 are both metal plates and are welded and fixed to the outer surface of the protective gas circulation member 1. After the sealing ring 22 is clamped between the two sealing plates 21, it is further fixed by bolts penetrating the three, so that the structural strength is higher. The number of bolts is set to be multiple and evenly distributed in the circumferential direction.

[0040] In this embodiment, the overall thickness of the barrier seal 2 is 2.5 mm (the sum of the thickness of the two sealing plates 21 and the sealing ring 22), the sealing plate 21 is a disc (plate) with an outer diameter of φ110 mm, and the thickness of the sealing ring 22 is 5 mm to 10 mm. The outer diameter is between 120 mm and 400 mm, which meets the requirements for welding of composite metal pipes with inner and outer diameters within this range.

[0041] As a preferred implementation, the valve is a constant pressure air release valve.

[0042] In the above implementation scheme, the valve adopts the constant pressure relief valve of the prior art, and the specific model is flexibly and reasonably selected according to the actual use requirements. During the on-site construction process, the protective gas is inflated into the protective gas filling chamber through the protective gas circulation member 1. When welding and sealing, the air pressure in the protective gas filling chamber will rise. When the air pressure reaches the safe value of the constant pressure relief valve, the constant pressure relief valve automatically opens to release the pressure, which will not cause damage to the tool and is safer.

[0043] Of course, the constant pressure release valve can also adopt the following structure:

[0044] like Figure 3As shown, the valve is a constant pressure vent valve, which includes a cylindrical valve body (indicated by e in the figure), the height of the valve body is designed to be 15.52mm, the maximum outer diameter of the valve body is φ11.5mm, the inner diameter is φ7.5mm, and a φ2mm through hole is processed at the center of the side wall of the valve body. A cylindrical valve core (indicated by f in the figure) with a diameter of φ3.5mm is coaxially distributed inside the valve body, the total length of the valve core is 20mm, one end of which passes through the through hole adapted to the top of the valve body, and a venting port 14 adapted to the valve core is provided on the surface of the protective gas circulation part 1, and a hemispherical structure adapted to the valve port is provided at the other end of the valve core, and the diameter of the plate hemispherical structure is φ2.5mm. A boss is provided at another point of the valve core, and a spring (indicated by g in the figure) is provided on the valve core sleeve, and the two ends of the spring are respectively in contact with the top wall of the valve body and the boss. In the initial state, under the action of the spring force, the hemispherical structure blocks the vent port 14. When the pressure in the protective gas filling chamber reaches the set value of the constant pressure vent valve, the airflow pushes the valve core to move, causing the hemispherical structure to push out the vent port 14, and the pressure can be released through the through hole in the side wall of the valve body.

[0045] As a preferred embodiment, a dragging portion 12 is provided at any one end or both ends of the protective gas circulation member 1 .

[0046] In the above embodiment, during the on-site construction process, the entire tool can be dragged and moved in the pipeline by connecting a rope or other adapter tools at the dragging portion 12, which makes the operation more convenient.

[0047] As a preferred embodiment, the dragging portion 12 is a U-shaped or annular component.

[0048] In the above embodiment, the shape of the towing portion 12 is designed to facilitate the connection of a rope or other matching tools.

[0049] In this embodiment, the dragging portion 12 is matched with a dragging rope, which is generally a steel wire rope of a suitable size.

[0050] As a preferred embodiment, the air inlet connector 13 is a horse tooth buckle connector.

[0051] In the above embodiment, the air inlet connector 13 is a variable diameter horse tooth buckle connector, which is easy to connect with the air injection hose. Generally, the maximum outer diameter of the air inlet connector 13 is φ18mm, and the middle through hole is φ8mm.

[0052] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A composite steel pipe welding protective gas filling tool, characterized in that: The protective gas circulation component (1) comprises a protective gas circulation component (1) and a barrier seal component (2), wherein the protective gas circulation component (1) has an internal air flow cavity, two barrier seal components (2) are provided and are installed at intervals at both ends of the protective gas circulation component (1), and an inflation hole (11) connected to the internal air flow cavity of the protective gas circulation component (1) is provided at a position corresponding to the position between the two barrier seal components (2) on the surface of the protective gas circulation component (1), and the protective gas circulation component (1) is provided with an air inlet joint (13) and an air outlet (14) connected to the internal air flow cavity of the protective gas circulation component (1), and the air outlet (14) is provided with a valve.

2. A composite steel pipe welding protective gas filling tool according to claim 1, characterized in that: The protective gas circulation member (1) is a long straight pipe.

3. A composite steel pipe welding protective gas filling tool according to claim 2, characterized in that: The inflation holes (11) are provided in plurality.

4. A composite steel pipe welding protective gas filling tool according to claim 3, characterized in that: The plurality of gas filling holes (11) are distributed in a spiral pattern at intervals on the surface of the protective gas circulation member (1).

5. A composite steel pipe welding protective gas filling tool according to claim 2, characterized in that: The barrier seal (2) comprises two annular sealing plates (21) and a flexible sealing ring (22) sandwiched between the two sealing plates (21); the sealing plates (21) are coaxially fixed outside the protective gas circulation component (1).

6. A composite steel pipe welding protective gas filling tool according to claim 5, characterized in that: The sealing ring (22) is a polyurethane ring or a rubber ring.

7. A composite steel pipe welding protective gas filling tool according to claim 1, characterized in that: The valve is a constant pressure air release valve.

8. The composite steel pipe welding protective gas filling tool according to claim 1, characterized in that: A dragging portion (12) is provided at any one end or both ends of the protective gas circulation member (1).

9. A composite steel pipe welding protective gas filling tool according to claim 8, characterized in that: The dragging portion (12) is a U-shaped or annular component.

10. A composite steel pipe welding protective gas filling tool according to claim 8, characterized in that: The dragging portion (12) is connected with a dragging rope.

Images