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Cleanings of the silica scale settled in the transportation-pipes of the geothermal hot water of the Onuma Geothermal Power Station

Journal Article:

Abstract

At the Onuma Geothermal Power Station, silica scale deposits in the hot water transportation pipes between production wells and injection wells, increased the thickness. The operations for cleaning the scale were effectively carried out by the following three methods. (1) Poli-Pig method: The shell-shaped plastic foam sponge mass named Poli-Pig was pressed in the pipes. Various shaped Poli-Pig such as armed by the steel spikes made scratches on the surface of the scale, and then stripped off. This method is effective when thickness of the scale is thinner than 20 mm. (2) Impact-Cutter method. Various shaped steel cutter blocks were attached at the end of a flexible shaft, and gave continuous impact by rotation on the scale and then smashing it away. This method is effective for various thickness, but pipes had to be cut off matched to the length of the flexible shaft. (3) Water-jet method. High pressured water jet through the special nozzle smashed away the scale. For this method the pipe had to be cut off at every joint.
Authors:
Publication Date:
Sep 01, 1978
Product Type:
Journal Article
Reference Number:
ERA-04-022552; EDB-79-035547
Resource Relation:
Journal Name: J. Jpn. Geotherm. Energy Assoc.; (Japan); Journal Volume: 15:3
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL POWER PLANTS; SCALING; ONUMA GEOTHERMAL FIELD; PIPELINES; DESCALING; ABRASION; CLEANING; CUTTING TOOLS; GEOTHERMAL WELLS; INJECTION WELLS; JETS; NOZZLES; PIPES; PLASTIC FOAMS; SILICA; CHALCOGENIDES; COLLOIDS; DISPERSIONS; FOAMS; GEOTHERMAL FIELDS; MINERALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; OXIDES; OXYGEN COMPOUNDS; POLYMERS; POWER PLANTS; SILICON COMPOUNDS; SILICON OXIDES; SURFACE FINISHING; THERMAL POWER PLANTS; TOOLS; WELLS; 150903* - Geothermal Engineering- Corrosion, Scaling & Materials Development
OSTI ID:
6435964
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: CODEN: JJGTA
Submitting Site:
TIC
Size:
Pages: 1-7
Announcement Date:

Journal Article:

Citation Formats

Ito, J. Cleanings of the silica scale settled in the transportation-pipes of the geothermal hot water of the Onuma Geothermal Power Station. Japan: N. p., 1978. Web.
Ito, J. Cleanings of the silica scale settled in the transportation-pipes of the geothermal hot water of the Onuma Geothermal Power Station. Japan.
Ito, J. 1978. "Cleanings of the silica scale settled in the transportation-pipes of the geothermal hot water of the Onuma Geothermal Power Station." Japan.
@misc{etde_6435964,
title = {Cleanings of the silica scale settled in the transportation-pipes of the geothermal hot water of the Onuma Geothermal Power Station}
author = {Ito, J}
abstractNote = {At the Onuma Geothermal Power Station, silica scale deposits in the hot water transportation pipes between production wells and injection wells, increased the thickness. The operations for cleaning the scale were effectively carried out by the following three methods. (1) Poli-Pig method: The shell-shaped plastic foam sponge mass named Poli-Pig was pressed in the pipes. Various shaped Poli-Pig such as armed by the steel spikes made scratches on the surface of the scale, and then stripped off. This method is effective when thickness of the scale is thinner than 20 mm. (2) Impact-Cutter method. Various shaped steel cutter blocks were attached at the end of a flexible shaft, and gave continuous impact by rotation on the scale and then smashing it away. This method is effective for various thickness, but pipes had to be cut off matched to the length of the flexible shaft. (3) Water-jet method. High pressured water jet through the special nozzle smashed away the scale. For this method the pipe had to be cut off at every joint.}
journal = {J. Jpn. Geotherm. Energy Assoc.; (Japan)}
volume = {15:3}
journal type = {AC}
place = {Japan}
year = {1978}
month = {Sep}
}