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The Hawaii Scientific Observation Hole (SOH) Program : summary of activities

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Title:The Hawaii Scientific Observation Hole (SOH) Program : summary of activities
Authors:Olson, Harry J.
Deymonaz, John E.
Keywords:Scientific Observation Hole
Puna
slim hole
testing
LC Subject Headings:Geothermal resources--Hawaii
Geothermal resources--Periodicals
Geothermal engineering--Periodicals
Geothermal power plants--Periodicals
Renewable energy sources--Oceania--Periodicals
show 3 morePower resources--Oceania--Periodicals
Energy conservation--Oceania--Periodicals
Transactions (Geothermal Resources Council)
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Date Issued:1992
Publisher:Geothermal Resources Council
Citation:Olson HJ, Deymonaz JE. 1992. The Hawaii Scientific Observation Hole (SOH) Program: Summary of activities. Geothermal Resources Council Transactions. 16: 47-53.
Series:School of Ocean and Earth Science and Technology contribution number 2936
Transactions (Geothermal Resources Council)
Abstract:The Hawaii Scientific Observation Hole (SOH) program was planned, funded, and initiated in 1988 by the Hawaii Natural Energy Institute, an institute within the School of Ocean and Earth Science and Technology, at the University of Hawaii at Manoa. Initial funding for the SOH program was $3.25 million supplied by the State of Hawaii to drill six, 4,000 foot scientific observation holes on Maui and the Big Island of Hawaii to confirm and stimulate geothermal resource development in Hawaii. After a lengthy permitting process, three SOHs, totaling 18,890 feet of mostly core drilling were finally drilled along the Kilauea East Rift Zone (KERZ) in the Puna district on the Big Island. The SOH program was highly successful in meeting the highly restrictive permitting conditions imposed on the program, and in developing slim hole drilling techniques, establishing subsurface geological conditions, and initiating an assessment and characterization of the geothermal resources potential of Hawaii - even though permitting specifically prohibited pumping or flowing the holes to obtain data of subsurface fluid conditions. The first hole, SOH-4, reached a depth of 2,000 meters, recorded a bottom hole temperature of 306.1°C, and established subsurface thermal continuity along the KERZ between the HGP-A and the True/Mid-Pacific Geothermal Venture wells. Although evidence of fossil reservoir conditions were encountered, no zones with obvious reservoir potential were found. The second hole SOH-1, was drilled to a depth of 1,684 meters, recorded a bottom hole temperature of 206.1°C, effectively doubled the size of the Hawaii Geothermal Project-Abbott/Puna Geothermal Venture (HGP-A/PGV) proven/probable reservoir, and defined the northern limit of the HGP-A/PGV reservoir. The final hole, SOH-2, was drilled to a depth of 2,073 meters, recorded a bottom hole temperature of 350.5°C, and has sufficient indicated permeability to be designated as a potential "discovery".
Pages/Duration:7 pages
URI/DOI:http://hdl.handle.net/10125/21085
Appears in Collections: Hawaii Natural Energy Institute Proceedings
The Geothermal Collection


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