Natural gas pipeline drag-reducing agent and preparation method thereof

A technology for natural gas pipelines and drag reducing agents, applied in pipeline systems, chemical instruments and methods, mechanical equipment, etc., can solve the problems of no drag reduction mechanism and theoretical guidance of molecular design of drag reducers, and achieve the application value of drag reduction and the reaction Mild conditions and simple operation

Inactive Publication Date: 2012-05-09
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of material can be used for prevention or minimizing friction between two surfaces when they come together during use on pipelines. It does this through forming a layer with tiny holes filled with oil beforehand, which makes them stick tightly onto the pipe walls while still allowing airflow around their edges. When added afterwards, these layers break down naturally over time, create small particles called “frangible balls” inside each hole, causing less resistance than if there were no such treatment. These films are made from hydrophobic alkoxylated aliphatic amine polymers containing carboxylic acid groups attached via ester bonds (COOH) instead of just one atom per unit cell.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency of delivering liquid from underground sources (pipeline) over longer distances while minimizing friction losses. Current techniques involve adding chemical agents like antispersive materials such as polyethylenegligomers called detergents, which help prevent damage to equipment when they come close together. However these conventional ways only work if the concentration level of the refrigerants remains constant throughout the journey. Additionally, some existing solutions require frequent filling of the dragreducers themselves, leading to increased cost.

Method used

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  • Natural gas pipeline drag-reducing agent and preparation method thereof
  • Natural gas pipeline drag-reducing agent and preparation method thereof
  • Natural gas pipeline drag-reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1, the preparation of natural gas pipeline drag reducer

[0031] Add 47.25 g of octadecyl alcohol into a three-necked flask, heat up to 60° C. for melting, then add 7.0 g of phosphorus pentoxide under rapid stirring (the molar ratio of octadecyl alcohol to phosphorus pentoxide is 3.5:1.0) , be warming up to 70 ℃, carry out esterification reaction at this temperature for 6 hours and obtain 54.25g esterification product; Then add 0.9g water in the esterification product obtained (the molar ratio of phosphorus pentoxide and water is 1.0: 1.0) , carry out hydrolysis reaction at 90 ℃ for 2 hours to obtain hydrolyzate 55.15g; then add 6.1g 2-hydroxyethylamine in the obtained hydrolyzate and carry out neutralization reaction (the mol ratio of phosphorus pentoxide and 2-hydroxyethylamine is 1.0:2.0), carry out neutralization reaction at 90°C for 1 hour, and then filter while hot to obtain 38.8g of white waxy solid, which is the drag reducer for natural gas pipelines....

Embodiment 2

[0032] Embodiment 2, preparation of natural gas pipeline drag reducer

[0033] Add 42.40 g of cetyl alcohol into a three-necked flask, heat up to 60° C. for melting, then add 7.0 g of phosphorus pentoxide under rapid stirring (the molar ratio of cetyl alcohol to phosphorus pentoxide is 3.5:1.0) , be warming up to 80 ℃, carry out esterification reaction at this temperature for 4 hours and obtain 49.40g esterification product; Then add 0.6g water in the esterification product obtained (the molar ratio of phosphorus pentoxide and water is 1.5: 1.0) , carried out hydrolysis reaction at 80 ℃ for 2.5 hours to obtain hydrolyzate 50.30g; Then in the hydrolyzate obtained, add 10.68g 2,2'-dihydroxydiethylamine to carry out neutralization reaction (phosphorus pentoxide and 2-hydroxyethylamine The molar ratio of the amine is 1.0:3.5), and the neutralization reaction is carried out at 90° C. for 1 hour, and then filtered while hot to obtain 60.98 g of white waxy solid, which is the natural...

Embodiment 3

[0034] Embodiment 3, preparation of natural gas pipeline drag reducer

[0035] Add 27.70 g of dodecyl alcohol into a three-necked flask, heat up to 60° C. for melting, then add 7.0 g of phosphorus pentoxide under rapid stirring (the molar ratio of dodecyl alcohol to phosphorus pentoxide is 3.0:1.0) , be warming up to 70 ℃, carry out esterification reaction at this temperature for 6 hours and obtain 39.60g esterification product; Then add 0.9g water in the esterification product obtained (the molar ratio of phosphorus pentoxide and water is 1.0: 1.0) , carry out hydrolysis reaction at 90 ℃ for 2 hours to obtain 40.50 g of hydrolyzate; then add 12.2 g of 2,2', 2"-trihydroxytriethylamine to the obtained hydrolyzate to carry out neutralization reaction (phosphorus pentoxide and 2 -The molar ratio of hydroxyethylamine is 1.0:4.0), neutralization reaction was carried out at 80° C. for 1.5 hours, and then filtered while hot to obtain 77.6 g of white waxy solid which was the natural g...

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Abstract

The invention provides a natural gas pipeline drag-reducing agent and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out esterification reaction on fatty alcohol and phosphorus pentoxide to obtain an esterification product; and (2) carrying out hydrolysis reaction on the esterification product to obtain a hydrolysis product, and then adding ethanolamine into the hydrolysis product to carry out neutral reaction, thus obtaining the natural gas pipeline drag-reducing agent. The preparation method of the natural gas pipeline drag-reducing agent has the advantages of direct material source, simple operation, moderate reaction conditions, relatively simple process and low requirements for equipment, and can easily realize the large-scale industrial production. Besides, the natural gas pipeline drag-reducing agent has potential application values in the aspect of natural gas pipeline transport.

Description

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Claims

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Application Information

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Owner CHINA NAT OFFSHORE OIL CORP
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