Hawaiʻi Geothermal Project Phase III - Well Testing and Analysis PDF Download

Author: Hawaii Geothermal Project
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Category : Geothermal engineering
Languages : en
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Languages : en
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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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Languages : en
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Activity in all areas of geosciences, well testing, numerical modelling, and analysis are reported. Brief reports are presented for the following geoscience tasks: seismic studies, geochemistry, hydrology, and physical properties of rocks. Also included is a report on numerical modelling, which outlines the current status of the study on free convection in a multi-layer geothermal reservoir with application to the Kapoho Geothermal Field. Six cases are under review to determine the effects of different Rayleigh numbers and length to height ratios on reservoir characteristics. The well testing program and to the preliminary analysis and interpretation of data are emphasized. A 1000-hour (42-day) flow test was completed. Initially it had been the intent to conduct a 90-day flow test, but the nuisance effect of both the noise and the hydrogen sulfide emissions - in conjunction with the fact that the pressure-time curves seemed well-stabilized after five time cycles on a semi-log plot - led to the decision to terminate the test after six weeks. The well testing data for HGP-A, continues to look quite favorable, whether considered from the quality of the fluid or the probable reliability and longevity of the well. Each flashing cycle results in slight improvement in flow rate, indicating either that the skin damage effect is diminishing or that additional microfracturing may be taking place. In reservoir engineering, a first cut is taken on establishing resasonable models both for HGP-A and for the Kapoho Geothermal Reservoir. These include three pre-drilling speculative models of the drill site, as well as broader modelling of the reservoir associated with HGP-A. Estimates are also presented on the possible magnitude and lifetime of reservoirs in the Puna Rift zone.

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Languages : en
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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.

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Languages : en
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An overview of the first five years of the Hawaiian Geothermal Project and a brief report of the management and coordination activity are presented. The first three phases are: exploratory surveys, experimental drilling, and well testing and analysis. A list of publications and a chronology of events are included. (MHR).

Author:
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Category : Geothermal engineering
Languages : en
Pages : 668

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Languages : en
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The Hawaii Geothermal Project, a coordinated research effort of the University of Hawaii, funded by the County and State of Hawaii, and ERDA, was initiated in 1973 in an effort to identify, generate, and use geothermal energy on the Big Island of Hawaii. A number of stages are involved in developing geothermal power resources: exploration, test drilling, production testing, field development, power plant and powerline construction, and full-scale production. Phase I of the Project, which began in the summer of 1973, involved conducting exploratory surveys, developing analytical models for interpretation of geophysical results, conducting studies on energy recovery from hot brine, and examining the legal and economic implications of developing geothermal resources in the state. Phase II of the Project, initiated in the summer of 1975, centers on drilling an exploratory research well on the Island of Hawaii, but also continues operational support for the geophysical, engineering, and socioeconomic activities delineated above. The project to date is between the test drilling and production testing phase. The purpose of this assessment is to describe the activities and potential impacts associated with extensive well flow testing to be completed during Phase II.

Author: Hawaii Geothermal Project
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Languages : en
Pages : 158

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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.