Instrumentation and Test Results for Hawaii Geothermal Project's HGP-A Well PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
With the completion of the drilling of HGP-A and indications of extremely high bottom hole temperatures, the next major phase in the Hawaii Geothermal Project is a test and analysis program designed to determine the properties of the well, the fluid, and the reservoir. The program described in this paper was formulated as a first step to obtain this information; current results of the program are also described. 4 figs.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
With the completion of the drilling of HGP-A and indications of extremely high bottom hole temperatures, the next major phase in the Hawaii Geothermal Project is a test and analysis program designed to determine the properties of the well, the fluid, and the reservoir. The program described in this paper was formulated as a first step to obtain this information; current results of the program are also described. 4 figs.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book 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.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Results of Phase I of the Hawaii Geothermal Project (HGP), which consisted of a two-year study on the potential of geothermal energy for the Big Island of Hawaii, are reviewed. One conclusion from Phase I was that preliminary results looked sufficiently encouraging to warrant the drilling of the first experimental geothermal well in the Puna area of the Big Island. During the first two months of drilling, parallel activity has continued in all research and support areas. Additional gravity, seismic, and electrical surveys were conducted; water and rock samples were collected; and analysis and interpretation of data has proceeded. Earlier work on mathematical and physical modeling of geothermal reservoirs was expanded; analysis of liquid-dominated geothermal systems continued; and studies on testing of geothermal wells were initiated. An environmental assessment statement of HGP No. 1 was prepared and baselines established for crucial environmental parameters. Economic, legal, and regulatory studies were completed and alternatives identified for the development of geothermal power in Hawaii. Early stages of the drilling program proceeded slowly. The initial 9 7/8-inch drill hole to 400 feet, as well as each of the three passes required to open the hole to 26 inches, were quite time consuming. Cementing of the 20-inch surface casing to a depth of 400 feet was successfully accomplished, and drilling beyond that depth has proceeded at a reasonable rate. Penetration below the surface casing to a depth of 1050 feet was accomplished at a drilling rate in excess of 150 feet per day, with partial circulation over the entire range.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The Hawaii Geothermal Project well HGP-A has undergone a two-year testing program which included cold water pumpdown tests, flashing flows with measurements of temperature and pressure profiles, and noise surveys. These tests and the data obtained are discussed in detail.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Drilling was completed on HGP-A to a depth of 6445 feet on April 27, 1976. A final core was taken; a series of logging runs performed, both with Gearhart-Owen equipment and with the Kuster temperature gauge; and the drill stem was withdrawn and laid down on the side adjacent to the rig - as a safety measure against possible volcanic tremors. A maximum temperature to date of 288/sup 0/C (550/sup 0/F) was recorded on May 13 at 4500 feet. The weighted temperature probe would penetrate no deeper into the drilling mud, which apparently is stiffening. The temperature depth relationship developed in HGP-A is illustrated.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Management and geosciences program activities are reviewed briefly. The primary emphasis in geosciences is on continued data analysis and synthesis. The engineering program continued with numerical modelling activities. The HGP-A wellhead assembly has been modified to reduce the noise level, and a new wellhead platform has been built which meets OSHA standards. HGP-A has been flash discharged from January 26 to February 11, 1977 and data obtained for throttled flow conditions by inserting orifices of varied sizes in the discharge line. A second pressure buildup test was run after the well was shut-in. Pressure and temperature profiles have been obtained during discharge and quiescent periods. Reservoir analyses have been made using pressure buildup and drawdown data.
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Author: Albert J. Rudman
Author: Kingston Reynolds Thom and Allardice Limited
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