Summary of Results of HGP-A Well Testing

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Description

The experimental well, HGP-A, drilled under the auspices of the Hawaii Geothermal Project, is located on the island of Hawaii near the eastern rift of Kilauea volcano. Drilling was completed to a depth of 6450 feet in April 1976. The well is cased to 2230 feet below the surface, which is 600 feet above sea level, with a slotted liner running from the end of the casing to bottomhole. Cuttings and core samples obtained during drilling indicate that the region is composed of volcanic basalt with a profile that contains a zone of open fractures (3300-4500 feet) and a zone ... continued below

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138-144

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Kihara, D.; Chen, B.; Yuen, P. & Takahashi, P. December 14, 1977.

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Description

The experimental well, HGP-A, drilled under the auspices of the Hawaii Geothermal Project, is located on the island of Hawaii near the eastern rift of Kilauea volcano. Drilling was completed to a depth of 6450 feet in April 1976. The well is cased to 2230 feet below the surface, which is 600 feet above sea level, with a slotted liner running from the end of the casing to bottomhole. Cuttings and core samples obtained during drilling indicate that the region is composed of volcanic basalt with a profile that contains a zone of open fractures (3300-4500 feet) and a zone of partially sealed fractures (4500-6450 feet) as shown in Figure 1. Conclusions from preliminary test results and analyses: the Kapho Geothermal Reservoir is liquid-dominated, with permeability thickness of ~ 1000 md-ft, very high temperatures ~ 350°C, high formation pressure ~ 2000 psi, slightly brackish water, and high silica content, and is potentially large; the HGP-A Geothermal Well borehole contains steam and water at saturation during flash; flashing occurs in formation; the well has high wellhead pressures ~ 160 psi at 50 Klb/hr steam, probably has severe skin damage, and potential power output ~ 3.5 MWe; the well’s producing regions are probably at bottomhole and 4300 feet; well flows have increased with each test. 5 figs., 5 tabs.

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138-144

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  • Proceedings, Third Workshop Geothermal Reservoir Engineering, Stanford University, Stanford, CA, Dec. 14-15, 1977

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  • Report No.: SGP-TR-25-21
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888841
  • Archival Resource Key: ark:/67531/metadc885089

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  • December 14, 1977

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 10:45 p.m.

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Kihara, D.; Chen, B.; Yuen, P. & Takahashi, P. Summary of Results of HGP-A Well Testing, article, December 14, 1977; United States. (digital.library.unt.edu/ark:/67531/metadc885089/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.