A method and device for preventing pipe thawing in permafrost regions by using foam materials

A foamed material, technology in frozen soil area, applied in pipeline laying and maintenance, pipe/pipe joint/pipe fittings, mechanical equipment, etc., can solve problems such as excessive electrical energy, loss of bearing capacity, reduction of mechanical bearing capacity, etc.

Active Publication Date: 2015-12-02
PIPECHINA SOUTH CHINA CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, after the permafrost thaws, the mechanical bearing capacity decreases sharply, or even loses the bearing capacity, making it impossible to effectively support the pipeline
Its shortcoming is that it not only consumes a lot of electric energy, does not take advantage of environmental protection and energy saving, but also has high operation and maintenance costs, which is economically unreasonable.
Also, the measure cannot be used in areas without a steady source of electricity

Method used

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  • A method and device for preventing pipe thawing in permafrost regions by using foam materials
  • A method and device for preventing pipe thawing in permafrost regions by using foam materials
  • A method and device for preventing pipe thawing in permafrost regions by using foam materials

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Embodiment Construction

[0080] EXAMPLE This example is used to illustrate the specific implementation of the present invention and further illustrate the present invention. In this example, polyurethane foam material is used to increase the local contact area between the pipeline and the permafrost, thereby improving the buoyancy of the pipeline in the permafrost swamp area to prevent the thawing problem of a buried crude oil pipeline in the permafrost swamp area. According to the geological survey results, it is found that this section is a permafrost swamp area, and the pipeline is directly laid on the silty clay layer with strong thawing property. The thickness of the clay layer is greater than 10m, and the thawing coefficient is greater than 10. 40%, the buoyant density after thawing permafrost is 910kg / m 3 , belongs to the strong melting subsidence area. The pipeline in this section is made of X65 steel, with a pipe diameter of 813mm, a pipe wall thickness of 16mm, a buried depth of 1.8m at the...

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Abstract

The invention relates to a method and a device for controlling thaw settlement of pipes in permafrost regions by foam material and relates to the technical field of pipeline systems. Support points are provided for a buried pipeline (1) every other a fixed value; each part, with one support point, of the buried pipeline (1) is covered with polyurethane foam material (2) which is covered with a light-weight high-strength aluminum alloy protective shell (3); the pipelines is supported by floating force of the support points so that beyond-expectation settlement of the pipelines is avoided. The device is provided with no moving parts, is free of maintenance, has good reliability, is free of power consumption and is applicable to buried pipelines in the permafrost regions.

Description

technical field [0001] The invention relates to a method and a device for preventing and controlling the thawing of a pipe body in a permafrost region by using a foaming material. It relates to the technical field of piping systems. Background technique [0002] With the rapid development of my country's economy, the demand for oil and gas resources is also increasing. As an economical, safe, and uninterrupted long-distance oil and gas transportation tool, oil and gas pipelines have achieved tremendous development in recent decades. However, since many oil and gas resources are stored in permafrost regions, in order to meet the demand for oil and gas resources for economic development, more and more oil and gas pipelines will inevitably be built in permafrost regions. At present, the crude oil pipelines built in permafrost regions at home and abroad are representative of the Alaska pipeline in the United States, the Norman Wells pipeline in Canada and the Moda pipeline in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L1/026
CPCF16L1/026
Inventor 张鑫冯少广李荣光赵国星陈朋超赵迎波吴官生马涛蔡永军刘国豪李睿段瑞哲高山卜张巍
Owner PIPECHINA SOUTH CHINA CO
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