Pressure Drops Due to Silica Scaling

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Experience with reinjection returns in many geothermal fields has prompted a move towards injecting waste fluids at some distance from the production field. This means that often, reinjection pipelines cover very long distances. If the waste water in the pipelines is supersaturated with respect to amorphous silica, then the deposition of silica in these pipelines is almost certain. Although the deposit may be of negligible thickness, the inner surface characteristics of the pipe will be different to those of clean mild steel. During a silica scaling experiment. geothermal brine was passed through a series of pipes of different sizes and ... continued below

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Brown, K. L.; Freeston, D. H.; Dimas, Z. O. & Slatter, A. January 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 14 times . More information about this report can be viewed below.

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Description

Experience with reinjection returns in many geothermal fields has prompted a move towards injecting waste fluids at some distance from the production field. This means that often, reinjection pipelines cover very long distances. If the waste water in the pipelines is supersaturated with respect to amorphous silica, then the deposition of silica in these pipelines is almost certain. Although the deposit may be of negligible thickness, the inner surface characteristics of the pipe will be different to those of clean mild steel. During a silica scaling experiment. geothermal brine was passed through a series of pipes of different sizes and over a period of three weeks, silica scale formed on the inner surface. The pressure drop along a distance of approximately 5m was measured by a water manometer in all test pipe sections. Significant pressure drop was observed during this time and can be correlated with the increase in the friction factor of the pipe walls due to silica scaling.

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  • Report No.: GEO-PROC-95-02
  • Grant Number: None
  • DOI: 10.2172/895947 | External Link
  • Office of Scientific & Technical Information Report Number: 895947
  • Archival Resource Key: ark:/67531/metadc881504

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1995

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • April 16, 2018, 3:03 p.m.

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Brown, K. L.; Freeston, D. H.; Dimas, Z. O. & Slatter, A. Pressure Drops Due to Silica Scaling, report, January 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc881504/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.