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S-shaped laying method of double-layer submarine pipelines

A technology for a submarine pipeline and a laying method, which is applied in the directions of pipeline laying and maintenance, pipeline protection, and protection of pipelines through thermal insulation, etc., can solve the problems such as the limitation of welding speed of double-layer submarine pipelines and the reduction of the laying efficiency of double-layer and double-layer submarine pipelines. Achieve the effect of improving offshore laying rate, saving offshore construction costs and reducing risks

Active Publication Date: 2016-05-25
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Since the inner and outer tubes of the double-layer submarine pipeline need to be welded, and it is completed in the same operation line, the welding speed of the inner and outer tubes of the double-layer submarine pipeline is greatly restricted. The welding workload of the inner pipe can only be completed in one site, so compared with the laying of single-layer sea pipes, the laying efficiency of double-layer seabed pipes is greatly reduced

Method used

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  • S-shaped laying method of double-layer submarine pipelines
  • S-shaped laying method of double-layer submarine pipelines
  • S-shaped laying method of double-layer submarine pipelines

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Embodiment Construction

[0071] Such as figure 1 — Figure 9A Shown, the present invention adopts following sea pipe laying steps:

[0072] Step 1: Initial laying of the double-layer submarine pipeline;

[0073] 1. Transport a double-layer submarine pipeline 7 with a flange, an ordinary double-layer submarine pipeline 5 and a submarine pipeline inner tube 6 with an insulation layer to the roller 1 in the operation line, wherein the The double-deck submarine pipeline 7 with flange has one end of flange to point to the stern (as image 3 , Figure 3A shown);

[0074] 2. Place the inner pipe 6 with the insulation layer between the flanged double-layer submarine pipeline 7 and the ordinary double-layer submarine pipeline 5. At the same time, the welding point between the two pipes is located at the operation station 8, and the Station 8 for welding operations;

[0075] 3. After the welding operation of the operation station 8 is completed, the outer pipe 18 of the ordinary double-layer submarine pip...

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Abstract

The invention provides an S-shaped laying method of double-layer submarine pipelines. The S-shaped laying method includes the following submarine pipeline laying steps that 1, start laying work is conducted on the double layers of submarine pipelines; 2, normal laying work of the double-layer submarine pipelines is conducted; 3, laying work of the double-layer submarine pipelines is ended. According to the S-shaped laying method of the double-layer submarine pipelines, when offshore construction work is conducted on the double-layer submarine pipelines, an inner pipe provided with a heat preservation layer is introduced into a work line, the sequence of fed pipes in the work line is adjusted, the workload of welding the inner pipe is reasonably allocated and completed by two work stations, and the offshore laying rate of the double-layer submarine pipelines is greatly raised; besides, offshore construction cost is also saved, and the risk of offshore construction is lowered.

Description

technical field [0001] The invention relates to a laying method of a submarine pipeline, in particular to an S-shaped laying method of a double-layer submarine pipeline used for offshore construction. It belongs to the field of offshore oil engineering. Background technique [0002] At present, restricted by factors such as equipment and water area, the S-shaped laying method of double-layer submarine pipelines is mostly used for laying at sea for the laying of double-layer submarine pipelines. Since the inner and outer tubes of the double-layer submarine pipeline need to be welded, and it is completed in the same operation line, the welding speed of the inner and outer tubes of the double-layer submarine pipeline is greatly restricted. The welding workload of the inner pipe can only be completed in one site. Therefore, compared with the laying of single-layer sea pipes, the laying efficiency of double-layer seabed pipes is greatly reduced. [0003] The welding of the abov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/18
CPCF16L1/18F16L59/143
Inventor 梁超陈永訢杜永军李建楠
Owner CHINA NAT OFFSHORE OIL CORP
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