Title:
pH ESTIMATION DEVICE AND pH ESTIMATION METHOD FOR SILICA-OVERSATURATED FLUID
Document Type and Number:
WIPO Patent Application WO/2024/057966
Kind Code:
A1
Abstract:
In the present invention, the pH of a fluid is estimated without using a pH gauge. Provided is a pH estimation system 10 for a silica-oversaturated fluid, said system comprising: a first flow path L1 which is branched from a pipe 20, through which a silica-containing fluid flows, and extracts a portion of the fluid; a first measurement part 1 which is connected to the first flow path via an open/close valve B2; a retention section L2 which is connected to the first flow path; a second flow path L3 which is connected to the retention section and returns the fluid to the pipe; a second measurement part 2 which is connected to the second flow path via an open/close valve B3; and a calculation device 3 which is electrically connected to the first measurement part and the second measurement part. The first measurement part and the second measurement part comprise a fluid temperature measurement device and a silica concentration measurement device; and the calculation device stores a silica concentration reduction rate, a silica saturation concentration, and a temperature-pH relational expression and calculates the pH of the fluid on the basis of measurement results obtained at the first measurement part and the second measurement part and the relational expression.
Inventors:
KATO TAICHIRO (JP)
UI SHINYA (JP)
WADA AZUSA (JP)
JIANG TIANLONG (JP)
UI FUMI (JP)
UI SHINYA (JP)
WADA AZUSA (JP)
JIANG TIANLONG (JP)
UI FUMI (JP)
Application Number:
PCT/JP2023/031952
Publication Date:
March 21, 2024
Filing Date:
August 31, 2023
Export Citation:
Assignee:
FUJI ELECTRIC CO LTD (JP)
International Classes:
G01N33/18
Domestic Patent References:
| WO2012144277A1 | 2012-10-26 |
Foreign References:
| JP2012083293A | 2012-04-26 | |||
| JP2021067430A | 2021-04-30 | |||
| JP2011196197A | 2011-10-06 | |||
| JP2011251210A | 2011-12-15 | |||
| JP2011058981A | 2011-03-24 | |||
| JP2001304980A | 2001-10-31 | |||
| US4306879A | 1981-12-22 |
Other References:
JIANG, T. 第一原理計算を用いたpH依存性のシリカ飽和濃度予測式の確立, 日本地熱学会学術講演会講演要旨集, 08 November 2022, vol. 2022, p. 99
TAJIMA SHOTA, SHIGESHI FUCHIDA, TATSUYA KATO, CHIHARU TOKORO: "pH and Temperature Effects for Kinetics of Silica Polymerization toward Silica Scale Suppression", RESOURCES PROCESSING, vol. 67, no. 1, 1 January 2020 (2020-01-01), pages 22 - 30, XP093146272
石井駿, シリカスケール生成抑制を目的としたMg, Al, Fe共存系におけるシリカ重合へのpHおよび温度影響の速度論的評価, 化学工学論文集, 20 November 2021, vol. 47, no. 6, pp. 237-244
NORIFUMI TODAKA, YOSHIHIKO MEZAKI: "A Study on Silica Scale Prevention —pH Modification Technique and Geochemical Evolutions of pH Modified Brine in Reservoir—", GEOTHERMAL, vol. 36, no. 3, 15 September 1999 (1999-09-15), pages 203 - 218, XP009553600, ISSN: 0385-7034
USDA AKIRA, KATO HISASHI, MIYAUCHI TAKASHI, KATO KOUICHI: "Investigation of pH Control Method to Avoid Silica Scaling in the Sumikawa Geothermal Field", JOURNAL OF THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN, THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN, vol. 25, no. 3, 25 July 2003 (2003-07-25), pages 163 - 177, XP093146277, ISSN: 0388-6735, DOI: 10.11367/grsj1979.25.163
TAJIMA SHOTA, SHIGESHI FUCHIDA, TATSUYA KATO, CHIHARU TOKORO: "pH and Temperature Effects for Kinetics of Silica Polymerization toward Silica Scale Suppression", RESOURCES PROCESSING, vol. 67, no. 1, 1 January 2020 (2020-01-01), pages 22 - 30, XP093146272
石井駿, シリカスケール生成抑制を目的としたMg, Al, Fe共存系におけるシリカ重合へのpHおよび温度影響の速度論的評価, 化学工学論文集, 20 November 2021, vol. 47, no. 6, pp. 237-244
NORIFUMI TODAKA, YOSHIHIKO MEZAKI: "A Study on Silica Scale Prevention —pH Modification Technique and Geochemical Evolutions of pH Modified Brine in Reservoir—", GEOTHERMAL, vol. 36, no. 3, 15 September 1999 (1999-09-15), pages 203 - 218, XP009553600, ISSN: 0385-7034
USDA AKIRA, KATO HISASHI, MIYAUCHI TAKASHI, KATO KOUICHI: "Investigation of pH Control Method to Avoid Silica Scaling in the Sumikawa Geothermal Field", JOURNAL OF THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN, THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN, vol. 25, no. 3, 25 July 2003 (2003-07-25), pages 163 - 177, XP093146277, ISSN: 0388-6735, DOI: 10.11367/grsj1979.25.163
Attorney, Agent or Firm:
OKUYAMA, Shoichi et al. (JP)
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