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In Japan, geothermal hot water containing arsenic concentrations of 0.5 ppm or higher must be reinjected into the subsurface, as mandated by the Prime Minister’s Office Ordinance enacted on June 21, 1971. This chapter examines the mechanisms and behaviors of reinjected fluids within geothermal reservoirsGeothermal reservoir. Topics include the cold sweep processCold sweep process, effects of fracture spacingFracture spacing, breakthroughBreakthrough phenomena, spatial distribution of reinjected fluids, and temperature-related influences. Furthermore, six typical reinjection wellReinjection well placement strategies are presented with schematic illustrations.

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Reinjection Wells

  • 章节

  • 发表日期：

    2026年

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  • Ko Sato

摘要

In Japan, geothermal hot water containing arsenic concentrations of 0.5 ppm or higher must be reinjected into the subsurface, as mandated by the Prime Minister’s Office Ordinance enacted on June 21, 1971. This chapter examines the mechanisms and behaviors of reinjected fluids within geothermal reservoirsGeothermal reservoir. Topics include the cold sweep processCold sweep process, effects of fracture spacingFracture spacing, breakthroughBreakthrough phenomena, spatial distribution of reinjected fluids, and temperature-related influences. Furthermore, six typical reinjection wellReinjection well placement strategies are presented with schematic illustrations.