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Submerged pipeline comprising a jacket comprising a polypropylene block copolymer

A polypropylene block, underwater pipeline technology, used in pipeline systems, pipeline protection, pipeline damage/wear prevention, etc., can solve problems such as loss of sealing function, and achieve good impact resistance.

Active Publication Date: 2020-08-18
TECH FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This blistering phenomenon can be disastrous for the sealing jacket and thus for the submerged pipeline containing it, as it can lead to a loss of its sealing function

Method used

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  • Submerged pipeline comprising a jacket comprising a polypropylene block copolymer
  • Submerged pipeline comprising a jacket comprising a polypropylene block copolymer
  • Submerged pipeline comprising a jacket comprising a polypropylene block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] Example 1: Swelling ratio of polypropylene in the presence of petroleum fluid at elevated temperature

[0165] Samples of different classes of polypropylene were weighed, then contacted with petroleum fluid Biofree EN 590 Diesel, and then weighed after a certain period of time in this fluid. The difference in mass before and after contact enables determination of the degree of swelling.

[0166] Table 1 compares and provides the swelling ratios (mass percent) of different classes of polypropylene in the presence of the petroleum fluid Biofree EN 590 Diesel.

[0167]

[0168] Table 1: Swell ratio of various polypropylenes in the presence of Biofree EN 590 diesel

[0169] These results show that the polypropylene block copolymers used in the sheathing of pipes according to the invention have a low swelling ratio in the presence of hydrocarbons at elevated temperatures.

Embodiment 2

[0170] Example 2: Resistance of polypropylene when severe pressure release

[0171] Several polypropylenes were saturated with gas at high temperature and pressure and then decompressed to atmospheric pressure (1 bar) at a depressurization rate of 70 bar / min similar to flexible pipe operation. The appearance of blisters on the polypropylene surface after this treatment was monitored (Table 2).

[0172]

[0173] Table 2: Occurrence of blistering on various polypropylene surfaces after severe pressure relief

[0174] These results show that the polypropylene block copolymer used in the jacket of the pipe according to the invention is capable of withstanding severe depressurization simulating a production shutdown.

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Abstract

The present invention relates to a submerged pipeline comprising a metallic reinforcement around an inner polymeric sealing sheath which can come into contact with hydrocarbons, a method for its preparation and its use for transporting hydrocarbons, characterized in that the inner polymeric The object containment sheath comprises a polypropylene block copolymer or a blend of polypropylene block copolymers, wherein the polypropylene block copolymer or the blend has a mass greater than 0.900 g / cm 3 Density and a melt index of less than 10 g / 10 min measured at 230 °C at a mass of 2.16 kg. This jacket can be used in contact with hydrocarbons at high temperatures.

Description

technical field [0001] The present invention relates to subsea pipelines for transporting hydrocarbons in deep water. [0002] These pipes may be used for long periods of time, eg several years, typically 20 years, at high pressures above 100 bar or even up to 1000 bar and at high temperatures above 130°C or even 170°C. Background technique [0003] Subsea pipelines for transporting hydrocarbons in deep water contain a metal reinforcement layer around an inner polymeric containment sheath in which hydrocarbons flow. [0004] The constituent materials of the inner polymeric containment sheath must be chemically stable and mechanically resistant to the transported fluid and its properties (composition, temperature and pressure). These materials must combine the properties of ductility, weatherability (typically at least 20 years of pipe life), and mechanical resistance to heat and pressure. These materials must be chemically inert, in particular with respect to the compounds...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/085B32B1/08B32B27/32F16L57/00
CPCB32B15/02B32B15/085B32B27/20B32B27/22B32B27/32B32B1/08F16L57/00B32B2270/00B32B2307/30B32B2307/704B32B2307/714B32B2307/72B32B2307/7265B32B2307/734B32B2597/00F16L11/083B29C48/022B29C48/09B29K2023/12B29K2995/004B29K2995/0063B29L2023/22B32B2250/05B32B2307/308F16L9/12F17D1/00
Inventor F·德曼兹
Owner TECH FRANCE SA
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