Field tests to determine scaling tendency of some moderate-temperature geothermal brines

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Several field tests were completed to determine the scaling tendency of moderate-temperature geothermal brines. Data were taken on the Heber as well as the East Mesa Known-Geothermal-Resources-Areas (KGRA's). The test results most directly benefit the Heber Geothermal Binary Demonstration Plant, but some have been generalized to be useful for other moderate-temperature (302 to 460/sup 0/F (150 to 239/sup 0/C)) geothermal reservoirs also. Field experiments determined conditions under which calcite, silica, and metal sulfides are likely to form. The calcite tests determined pressures which must be maintained to prevent gas-breakout and ensuing calcite deposition. Required pressures varied from one reservoir to ... continued below

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Pages: 90

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Robertus, R.J.; Sullivan, R.G. & Shannon, D.W. September 1, 1986.

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Description

Several field tests were completed to determine the scaling tendency of moderate-temperature geothermal brines. Data were taken on the Heber as well as the East Mesa Known-Geothermal-Resources-Areas (KGRA's). The test results most directly benefit the Heber Geothermal Binary Demonstration Plant, but some have been generalized to be useful for other moderate-temperature (302 to 460/sup 0/F (150 to 239/sup 0/C)) geothermal reservoirs also. Field experiments determined conditions under which calcite, silica, and metal sulfides are likely to form. The calcite tests determined pressures which must be maintained to prevent gas-breakout and ensuing calcite deposition. Required pressures varied from one reservoir to the next and were strong functions of non-condensable gas content. The brine cooling tests tried to quantify the amount of silica which would drop out of the Heber brine by incrementally cooling it below a design set point of 150/sup 0/F (66/sup 0/C). The conclusion was that no detectable increase in silica occurred in times relevant to plant operations when the brine was cooled to 120/sup 0/F (49/sup 0/C). Although the cooling tests showed no detectable increase in silica formation, other materials did form in small amounts. The list includes magnetite (Fe/sub 3/O/sub 4/), calcite (CaCO/sub 3/), and mixtures of lead, zinc, and arsenic sulfides. Even for the lowest outlet temperature (120/sup 0/F) the particulate loading increased only about 50% over inlet conditions. Thus, for the Heber brines, the majority of material entering an injection well comes in the form of sand from the production wells. This same conclusion was supported by earlier work on the East Mesa KGRA.

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Pages: 90

Notes

NTIS, PC A05/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted

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  • Other: DE86016089
  • Report No.: PNL-5991
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/5293335 | External Link
  • Office of Scientific & Technical Information Report Number: 5293335
  • Archival Resource Key: ark:/67531/metadc1068732

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Creation Date

  • September 1, 1986

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 20, 2018, 1:40 p.m.

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Robertus, R.J.; Sullivan, R.G. & Shannon, D.W. Field tests to determine scaling tendency of some moderate-temperature geothermal brines, report, September 1, 1986; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1068732/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.