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Water sweeping and drying pipe cleaner train of natural gas pipeline

A technology for natural gas pipelines and pigs, which is applied in the directions of cleaning hollow objects, cleaning methods and utensils, chemical instruments and methods, etc., can solve the problems of wear and leakage of the pigs, increased risk of ball jamming, waste of equipment fuel, and long construction time. and other problems, to achieve the effect of improving the sealing performance and walking distance, increasing the pigging sealing effect, and enhancing the drying effect.

Inactive Publication Date: 2015-11-25
HENAN ZHONGTUO PIPELINE ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For long-distance, large-diameter, deep-water subsea natural gas pipelines, water cleaning and drying are carried out separately. The pipeline needs to pass the ball multiple times, which takes a long time for construction and wastes a lot of resources such as equipment and fuel. In addition, with the increase in the number of ball passes, the pig The risk of wear, leakage and ball jamming is also greatly increased
Once the ball is stuck in the submarine pipeline, the cost will be very high if the ball has to be taken care of continuously

Method used

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  • Water sweeping and drying pipe cleaner train of natural gas pipeline

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Embodiment Construction

[0016] A natural gas pipeline cleaning and drying pig train, suitable for cleaning natural gas pipelines, including five bidirectional straight plate pigs, and also includes fresh water slugs, water-based gel slugs, triethylene glycol slugs, drying Composed of nitrogen slugs, the fresh water slugs, water-based gel slugs, triethylene glycol slugs, and dry nitrogen slugs are arranged alternately with the pigs in sequence, and the number of the same medium slugs can be adjusted according to actual needs . The composition and structure of the natural gas pipeline cleaning and drying pig train is as follows: figure 1 As shown, set in sequence as pig one, fresh water slug, pig two, water-based gel slug, pig three, triethylene glycol slug, pig four, dry nitrogen slug, pig Device five.

[0017] The components of the natural gas pipeline cleaning and drying pig train are loaded into the pipeline according to the design sequence and quantity; the compressed drying gas is used to drive...

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Abstract

The invention relates to natural gas conveying pipeline construction equipment, in particular to a water sweeping and drying pipe cleaner train of a natural gas pipeline, and is suitable for various natural gas conveying pipelines. The water sweeping and drying pipe cleaner train of the natural gas pipeline is suitable for sweeping the natural gas pipeline, comprises multiple pipe cleaners, and further comprises a fresh water section plug, a water base gel section plug, a chemical drying agent section plug and a drying gas section plug, wherein the fresh water section plug, the water base gel section plug, the chemical drying agent section plug and the drying gas section plug are alternately arranged with the pipe cleaners in sequence. The pipe cleaner train, provided by the invention, is suitable for the water sweeping and the drying of long-distance and large-caliber natural gas conveying pipelines at the deepwater seabed.

Description

technical field [0001] The invention relates to a natural gas pipeline construction equipment, in particular to a natural gas pipeline cleaning and drying pig train, which is suitable for various natural gas pipelines. Background technique [0002] After the hydrostatic test of the natural gas pipeline, it is necessary to carry out various processes such as water sweeping, drying, nitrogen filling and inerting. The main component of natural gas is methane (CH4). Under high pressure and low temperature, methane easily combines with water to form natural gas hydrate (CH4·H2O), commonly known as combustible ice, which blocks pipelines, flow meters, valves, etc., and affects the normal transportation of pipelines; Residual moisture is easy to combine with sulfur dioxide in natural gas to form acidic hydrogen sulfide solution to corrode the pipe wall; in addition, the residual free water in the pipeline accumulates in low-lying places, which can reduce the cross-sectional area of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/055B08B13/00
CPCB08B9/055B08B9/0553B08B13/00B08B2209/04B08B2209/055
Inventor 葛延超张严甫徐伟辛然
Owner HENAN ZHONGTUO PIPELINE ENG
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