Seabed oil and gas conveying pipeline

Abstract

A submarine oil and gas conveying pipeline is composed of a pipe body and a balancing weight. The pipe body comprises a working steel pipe and an anti-corrosion layer, the working steel pipe is a seamless steel pipe or a spiral steel pipe, the anti-corrosion layer is arranged outside the working steel pipe, and the anti-corrosion layer is of a 3PE structure, namely, the bottom layer is epoxy powder coating, the middle layer is adhesive, and the outer layer is a polyethylene winding layer. The pipe body is sleeved with the balancing weight, and the balancing weight is of a reinforced concrete pouring structure. The anticorrosive coating and the balancing weight are arranged outside the working steel pipe, so that the capability of adapting to severe environments of the submarine oil and gas pipeline is improved, the influence of seawater buoyancy is overcome, and the purposes of improving the laying working efficiency of the submarine oil and gas conveying pipeline and prolonging the service life of the submarine oil and gas conveying pipeline are achieved.

Description

Technical Field

[0001] The utility model relates to an oil and gas transmission pipeline, in particular to an oil and gas transmission pipeline suitable for laying on the seabed. Background Art

[0002] Submarine oil and gas pipelines can achieve continuous transportation, and will not force oil fields to reduce or stop production due to the capacity limit of offshore oil and gas storage facilities or the untimely pick-up of shuttle tankers. They have the advantages of high transportation efficiency and strong transportation capacity. In addition, the laying period of submarine pipelines is short, the production is fast, the management is convenient, and the operating cost is low. Therefore, submarine oil and gas pipelines are an important way to connect internal facilities in marine oil and gas fields and to transport oil and gas resources. However, since submarine oil and gas pipelines are in harsh environments such as waves, currents, and erosion, higher requirements are placed on the corrosion resistance of materials. At the same time, the buoyancy of seawater also causes troubles in the laying and positioning of submarine oil and gas pipelines. Utility Model Content

[0003] The utility model provides a submarine oil and gas pipeline, which aims to improve the ability of the submarine oil and gas pipeline to adapt to harsh environments and overcome the influence of seawater buoyancy by arranging an anti-corrosion layer and a counterweight block outside a working steel pipe, so as to improve the efficiency of laying the submarine oil and gas pipeline and extend the service life of the submarine oil and gas pipeline.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A submarine oil and gas transmission pipeline consists of a pipe body and a counterweight; the pipe body includes a working steel pipe and an anti-corrosion layer, the working steel pipe is a seamless steel pipe or a spiral steel pipe, an anti-corrosion layer is arranged on the outside of the working steel pipe, the anti-corrosion layer is a 3PE structure, that is, the bottom layer is epoxy powder coating, the middle layer is adhesive, and the outer layer is a polyethylene winding layer; the counterweight is mounted on the outside of the pipe body, and the counterweight is a reinforced concrete casting structure.

[0006] The above-mentioned submarine oil and gas transmission pipeline has anti-skid particles arranged on the polyethylene winding layer, and the anti-skid particles are evenly distributed on the outer surface of the polyethylene winding layer.

[0007] In the above-mentioned submarine oil and gas transmission pipeline, the counterweight block is an integrally cast structure of the pipe body and reinforced concrete, and the counterweight block and the pipe body are embedded as a whole.

[0008] The above-mentioned submarine oil and gas transmission pipeline, the counterweight block is a split structure, including a base and a pressure block, both of which are provided with positioning grooves matching the cross-section of the pipe body, the base and the pressure block are connected as a whole by a bolt assembly, and the pipe body is embedded in the positioning grooves of the base and the pressure block.

[0009] In the above-mentioned submarine oil and gas transmission pipeline, the counterweight block has a square sleeve-shaped cross-section structure.

[0010] In the above-mentioned submarine oil and gas transmission pipeline, the counterweight block has a circular sleeve-shaped cross-section structure.

[0011] The utility model provides a submarine oil and gas pipeline, which is provided with a 3PE anti-corrosion layer on the outside of the working steel pipe, thereby improving the ability of the submarine oil and gas pipeline to adapt to harsh environments; the utility model is provided with a counterweight block of a reinforced concrete casting structure on the outside of the pipe body, which can balance the buoyancy of seawater through the counterweight block, thereby ensuring that the submarine oil and gas pipeline is reliably positioned and fixed during the laying and operation process; the utility model is also provided with anti-skid particles on the outer surface of the anti-corrosion layer of the pipe body, thereby avoiding relative sliding between the counterweight block and the pipe body, and making the counterweight block and the pipe body tightly integrated. In short, the utility model achieves the purpose of improving the laying efficiency of the submarine oil and gas pipeline and extending the service life of the submarine oil and gas pipeline through the above technical means. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-sectional structure of the submarine oil and gas transmission pipeline described in the utility model;

[0013] Figure 2 yes Figure 1 AA cross-sectional structural diagram (for the first embodiment, i.e., the embodiment of the integrally cast square sleeve-shaped cross-sectional structural assembly block);

[0014] Figure 3 yes Figure 2 The enlarged view of the structure at position Ⅰ in the middle;

[0015] Figure 4 yes Figure 1 AA cross-sectional structural diagram (for the second embodiment, i.e., the embodiment of the integrally cast circular sleeve-shaped cross-sectional structural assembly block);

[0016] Figure 5 1. It is a schematic diagram of the assembly structure of the split structure counterweight block and the tube body (for the third embodiment, i.e., the embodiment of the assembly block with a square sleeve-shaped cross-section structure);

[0017] Figure 6 It is a schematic diagram of the assembly structure of the split structure counterweight block and the tube body (for the fourth embodiment, i.e. the embodiment of the assembly block with a circular sleeve-shaped cross-section structure).

[0018] Explanation of the symbols in the figure:

[0019] 1 is a working steel pipe; 2 is an anti-corrosion layer, 2-1 is anti-skid particles; 3 is a counterweight block, 3-1 is a pressure block, 3-2 is a base; 4 is a bolt assembly. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] See Figure 1. Figure 2 , Figure 4 The utility model provides a submarine oil and gas transmission pipeline, which consists of a pipe body and a counterweight 3; the pipe body includes a working steel pipe 1 and an anti-corrosion layer 2, the working steel pipe 1 adopts a seamless steel pipe or a spiral steel pipe, and an anti-corrosion layer 2 is arranged on the outside of the working steel pipe 1, and the anti-corrosion layer 2 is a 3PE structure, that is, the bottom layer is epoxy powder coating, the middle layer is adhesive, and the outer layer is a polyethylene winding layer; the counterweight 3 is mounted on the outside of the pipe body, and the counterweight 3 is a reinforced concrete casting structure.

[0022] See also Figure 1 , Figure 2 , Figure 3 The submarine oil and gas transmission pipeline described in the utility model has anti-skid particles 2-1 arranged on the polyethylene winding layer of the pipe body anti-corrosion layer 2, and the anti-skid particles 2-1 are evenly distributed on the outer surface of the polyethylene winding layer.

[0023] See also Figure 1 , Figure 2 The first preferred embodiment of the submarine oil and gas transmission pipeline described in the utility model is as follows: the counterweight block 3 has a square sleeve-shaped cross section, and its pipe body is integrally cast with reinforced concrete, and the counterweight block 3 is embedded in the pipe body as a whole.

[0024] See also Figure 1 , Figure 4 The second preferred embodiment of the submarine oil and gas transmission pipeline described in the utility model is as follows: the counterweight block 3 has a circular sleeve-shaped cross section, and its pipe body is integrally cast with reinforced concrete, and the counterweight block 3 is embedded in the pipe body as a whole.

[0025] See also Figure 1 , Figure 5 The third preferred embodiment of the submarine oil and gas transmission pipeline described in the utility model is as follows: the counterweight block 3 has a square sleeve-shaped cross-section and adopts a split structure, including a base 3-2 and a pressure block 3-1. Positioning grooves matching the cross-section of the pipe body are provided on the base 3-2 and the pressure block 3-1. The base 3-2 and the pressure block 3-1 are connected as a whole by a bolt assembly 4, and the pipe body is embedded in the positioning grooves of the base 3-2 and the pressure block 3-1.

[0026] See also Figure 1 , Figure 6 The fourth preferred embodiment of the submarine oil and gas transmission pipeline described in the utility model is as follows: the counterweight block 3 has a circular sleeve-shaped cross-section and adopts a split structure, including a base 3-2 and a pressure block 3-1. Positioning grooves matching the cross-section of the pipe body are provided on the base 3-2 and the pressure block 3-1. The base 3-2 and the pressure block 3-1 are connected as a whole by a bolt assembly 4, and the pipe body is embedded in the positioning grooves of the base 3-2 and the pressure block 3-1.

[0027] See also Figures 1 to 6 The utility model provides a submarine oil and gas pipeline, which is provided with a 3PE anti-corrosion layer 2 on the outside of a working steel pipe 1, improving the ability of the submarine oil and gas pipeline to adapt to harsh environments; the utility model is provided with a counterweight block 3 of a reinforced concrete casting structure on the outside of the pipe body, which can balance the buoyancy of seawater through the counterweight block 3 to ensure that the submarine oil and gas pipeline is reliably positioned and fixed during the laying and operation process; the utility model also provides anti-skid particles 2-1 on the outer surface of the pipe body anti-corrosion layer 2 to avoid relative sliding between the counterweight block and the pipe body, so that the counterweight block and the pipe body are tightly combined into one. The submarine oil and gas pipeline described in the utility model can complete the prefabrication process in the factory, and then complete the welding operation of two adjacent groups of pipelines on the laying construction ship, and cover the welding interface area with a 3PE anti-corrosion layer, and then place it at a set position on the seabed by a towing device.

Claims

1. A submarine oil and gas pipeline, characterized in that: It consists of a pipe body and a counterweight (3); the pipe body comprises a working steel pipe (1) and an anti-corrosion layer (2); the working steel pipe (1) is a seamless steel pipe or a spiral steel pipe; the anti-corrosion layer (2) is arranged outside the working steel pipe (1); the anti-corrosion layer (2) is a 3PE structure, that is, the bottom layer is an epoxy powder coating, the middle layer is an adhesive, and the outer layer is a polyethylene winding layer; the counterweight (3) is sleeved outside the pipe body; the counterweight (3) is a reinforced concrete casting structure.

2. The submarine oil and gas pipeline according to claim 1, characterized in that: Anti-skid particles (2-1) are arranged on the polyethylene wrapping layer, and the anti-skid particles (2-1) are evenly distributed on the outer surface of the polyethylene wrapping layer.

3. The submarine oil and gas pipeline according to claim 2 is characterized in that: The counterweight block (3) is an integrally cast structure of a pipe body and reinforced concrete, and the counterweight block (3) and the pipe body are embedded as a whole.

4. The submarine oil and gas pipeline according to claim 2, characterized in that: The counterweight block (3) is a split structure, comprising a base (3-2) and a pressing block (3-1), both of which are provided with positioning grooves matching the cross-section of the tube body, the base (3-2) and the pressing block (3-1) are connected as a whole by a bolt assembly (4), and the tube body is embedded in the positioning grooves of the base (3-2) and the pressing block (3-1).

5. The submarine oil and gas pipeline according to claim 3 or 4, characterized in that: The counterweight block (3) has a square sleeve-shaped cross-sectional structure.

6. The submarine oil and gas pipeline according to claim 3 or 4, characterized in that: The counterweight block (3) has a circular sleeve-shaped cross-sectional structure.

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