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Synthesis, Performance Evaluation and Field Application of Polymer-Type Natural Gas Drag Reduction Agent

[+] Author Affiliations
Haihong Xu, Yanqing Gao, Guoping Li, Zhiheng Zhang, Weichun Chang

PetroChina Pipeline Company, Langfang, Hebei, China

Paper No. IPC2012-90182, pp. 515-521; 7 pages
doi:10.1115/IPC2012-90182
From:
  • 2012 9th International Pipeline Conference
  • Volume 1: Upstream Pipelines; Project Management; Design and Construction; Environment; Facilities Integrity Management; Operations and Maintenance; Pipeline Automation and Measurement
  • Calgary, Alberta, Canada, September 24–28, 2012
  • Conference Sponsors: International Petroleum Technology Institute, Pipeline Division
  • ISBN: 978-0-7918-4512-7
  • Copyright © 2012 by ASME

abstract

Natural gas is gaining popularity in the world as a high quality, clean burning alternative to oil and coal. The Mechanism of Drag Reduction in the natural gas pipelines is to control the radial pulsation of gas adjacent to pipeline wall effectively. The way to lower the pulsation intension of the gas in the thin layer along the wall is to use gas drag reduction agents, whose polar end absorbs fixedly to the surface and whose non-polar long chain suspends in natural gas so as to have a function of restraining the gas’ radial pulsation. The drag reduction agent molecule absorbed to the protruding is mainly to weaken the gas pulsation producing by virtue of roughness degree. The drag reduction agent molecule absorbed to and collected in the dents also has the function of lowering the equivalent roughness degree of the wall surface. A polymer-type natural gas drag reduction agent with polarity as well as nonpolarity long chain was studied. We synthesized polymers that contain long chain fatty acid (F) or long chain ester (E) as soft chain, and alkoxy residues or acylations as polar group, then studied the effects of this polymer-type gas drag reduction agent on the pipe wall, natural gas quality, station processes and equipments as well as post-processing. A test loop with control software was developed for evaluating natural gas drag reduction agents. An on-line injected system for natural gas reduction agent was established. The product was applied on natural gas pipelines in China. In No.1 oil production plant of Changqing oilfield, the drag reducing efficiency is 19.5%, and the flow increase rate is 12.4%. In pipeline from Lanzhou to Yinchuan, the drag reducing efficiency is all above 10%, and the flow increase rate is all above 5%.

Copyright © 2012 by ASME

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