Hawaii Natural Energy Institute Proceedings

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Recent Submissions

Now showing 1 - 5 of 18
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    The utilization of volcano energy : the proceedings of a United States-Japan cooperative science seminar held at Hilo, Hawaii, February 4-8, 1974
    (Sandia National Laboratories, 1975) United States-Japan Cooperative Science Seminar on Utilization of Volcano Energy
    Summary papers presented at geothermal workshop in Hilo, 1974.
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    The Hawaiian Scientific Observation Hole Program Preliminary Results and Status Report: 1991 Presentation
    (Auckland University, 1991) Olson, Harry J. ; Deymonaz, John E.
    Summary of results from SOH drilling program.
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    Environmental concerns and permitting conditions of the Hawaiian Scientific Observation Hole (SOH) Program
    (Auckland University, 1992) Olson, Harry J. ; Deymonaz, John E.
    Summary paper of environmental issues associated with the Scientific Observation Hole drilling program in Puna.
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    Deep, slim hole, Diamond core drilling program proves effective for geothermal assessment in Hawaii
    (Hawaii Natural Energy Institute, University of Hawaii at Manoa, 1993) Olson, Harry J. ; Deymonaz, John E.
    The Hawaii State legislature, in 1988, funded a deep, slim-hole, diamond core drilling program, known as the Scientific Observation Hole (SOH) program, "to stimulate geothermal development and confirm the geothermal resources of Hawaii." This program was designed by the Hawaii Natural Energy Institute (HNEI) at the University of Hawaii at Manoa to assess the geothermal resources of the Kilauea East Rift Zone (KERZ) on the Big Island of Hawaii. The program is funded by the Hawaii Department of Business, Economic Development, and Tourism and managed by HNEI. To assess the geothermal potential of the KERZ, a fence of four holes, three of which were drilled, were sited along the long axis of the KERZ within existing Geothermal Resource Subzones. These holes were located to provide stepout drill coverage between existing and planned geothermal production wells, and to pair the SOHs with production wells to test for permeability across the rift zone. Successful drilling techniques and casing procedures were devised as the rock section became known and its characteristics noted. Above 1300 C (270o p) a complex stearate was added to the drilling fluids to maintain lubricity. Above 1650 C (330o F) a mixture of soda ash, high temperature polymer, complex stearate, and sepiolite virtually eliminated high torque and vibration problems frequently associated with high temperature drilling. The core and other data from the SOHs have proven to be extremely valuable for both active developers in siting production wells, and in the understanding of the subsurface geologic conditions. The first hole drilled, SOH-4, provided thermal and permeability conditions along the eastern portion of the True/Mid-Pacific Geothermal Venture's lease, and was instrumental in the proposed location of True's #2 site. SOH-4 was drilled to a total depth of 2,000.1 meters (66562 feet) and recorded bottom hole temperatures of 306.1oC (583 F) at a depth of 1,950.7 meters (6,400 feet). The second hole, SOH-1, effectively defined the northern extent of the Puna Geothermal Venture's (PGV) HGP-A/PGV reservoir, doubled the proven reservoir size, and provided sufficient data to the lending institution for continued project funding. SOH-1 was drilled to a total depth of 1,684.3 meters ~5,526 feet) and recorded a bottom hole temperature of 206.1 C (403 0 F). The third hole, SOH-2, was drilled on a PGV lease to a total depth of 2,073.2 meters (6,802 feet), recorded a bottom hole temperature of 350.6oC (663 0 F), and may have intersected a potential reservoir at a depth of approximately 1,490 meters (4,900 feet).
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    The Hawaii Scientific Observation Hole (SOH) Program : summary of activities
    (Geothermal Resources Council, 1992) Olson, Harry J. ; Deymonaz, John E.
    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".