| Title | Well Stimulation Using Cold-Water Injection Experiments in the Sumikawa Geothermal Field, Akita Prefecture, Japan |
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| Authors | Kitao, Koji; Ariki, Kazuharu; Hatakeyama, Kazuyoshi; Wakita, Kenji |
| Year | 1990 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Production; Reservoir Engineering; Injection; Well Stimulation; Formation Damage; Fractures; Reservoir Stimulation; Temperature; Viscosity; Water; Injection Tests; Propant; Injectivity Index |
| Abstract | Cold water injection experiments with cold river water at a high injection flow rate were applied to a well stimulation to improve the productivity and injectivity of geothermal wells at Sumikawa. Injection and warming up were repeatedly conducted for each well. This paper describes the results of cold water injection experiments for three production wells (SA-1, SA-2, and SA-4). The injectivity of each well was improved, and the productivity of SA-1 and SA-4 was increased increasingly after cold water injection experiments. |