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Reservoir Engineering Aspects of the Philippines Geothermal Developments in Leyte and Southern Negros

Description: The current state of development of the Tongonan and Puhagan geothermal fields in the Philippines is presented and the nature of the reservoirs is described. In the latter part of the paper, reservoir engineering techniques which have been found to be particularly valuable are discussed and some aspects which give rise to problems are identified.
Date: December 15, 1983
Creator: Kingston, R. & Watson, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reservoir Simulation on the Cerro Prieto Geothermal Field: A Continuing Study

Description: The Cerro Prieto geothermal field is a liquid-dominated geothermal reservoir of complex geological and hydrological structure. It is located at the southern end of the Salton-Mexicali trough which includes other geothermal anomalies as Heber and East Mesa. Although in 1973, the initial power plant installed capacity was 75 MW of electrical power, this amount increased to 180 MW in 1981 as field development continued. It is expected to have a generating capacity of 620 MW by the end of 1985, whe… more
Date: December 15, 1983
Creator: Castaneda, M.; Marquez, R.; Arellano, V. & Esquer, C.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Resource Evaluation and Development Plans for a 120 MW Geothermal Power Plant on Milos Island, Greece

Description: Five deep wells have been drilled on the Island of Milos, Greece, identifying a high-temperature, high-enthalpy geothermal reservoir. The thermodynamic properties of the fluid, and the estimated porosity and presumed thickness of the formation suggest a fluid and heat storage capacity that could support a 60 MWe power plant for 85 years or a 120 MWe for half that time. The existing five wells can deliver 180 t/h of steam at 10 bar abs pressure, capable of generating a maximum electric power out… more
Date: December 15, 1983
Creator: Economides, M. J.; Ehlig-Economides, C. A.; Speliotis, G. & Vrouzi, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Response of East Mesa and Raft River Reservoirs to Injection-Backflow Testing

Description: Analysis of tracer recovery curves from injection-backflow testing at two geothermal reservoirs reveals large differences in response between the two. The East Mesa reservoir is in a layered sandstone matrix, and tracer behavior can be adequately described by porous media theory. As the volume of water injected into the reservoir increases and, consequently, the depth of penetration into the formation, the ratio of dispersive flux to advective flux decreases, indicating the increasing importanc… more
Date: December 15, 1983
Creator: Russell, B. F.; Hull, L. C. & Downs, W. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Rock Failure in Compression

Description: Mechanisms of rock failure in compression--axial splitting and shear failiure-- are studied, based on a microscopic consideration. Analytical models are constructed and model experiments on plates of a brittle polymer are performed. It is shown that unstable growth of tension cracks which propagate from the tips of pre-existing cracks and curve towards the maximum compressive direction, is the fundamental mechanism that produces axial splitting of a uniaxially compressed rock specimen, whereas … more
Date: December 15, 1983
Creator: Nemat-Nasser, S. & Horii, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Selected data for low-temperature (less than 90{sup 0}C) geothermal systems in the United States: reference data for US Geological Survey Circular 892

Description: Supporting data are presented for the 1982 low-temperature geothermal resource assessment of the United States. Data are presented for 2072 geothermal sites which are representative of 1168 low-temperature geothermal systems identified in 26 States. The low-temperature geothermal systems consist of 978 isolated hydrothermal-convection systems, 148 delineated-area hydrothermal-convection systems, and 42 delineated-area conduction-dominated systems. The basic data and estimates of reservoir condi… more
Date: December 15, 1983
Creator: Reed, Marshall J.; Mariner, Robert H.; Brook, Charles A. & Sorey, Michael L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simulation of Radon Transport in Geothermal Reservoirs

Description: Numerical simulation of radon transport is a useful adjunct in the study of radon as an in situ tracer of hydrodynamic and thermodynamic numerical model has been developed to assist in the interpretation of field experiments. The model simulates transient response of radon concentration in wellhead geofluid as a function of prevailing reservoir conditions. The radon simulation model has been used to simulate radon concentration response during production drawdown and two flowrate transient test… more
Date: December 15, 1983
Creator: Semprini, Lewis & Kruger, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Slug Test Data Analysis in Reservoirs with Double Porosity Behaviour

Description: Pressure analysis for a slug test which corresponds to the flow period of a Drill Stem test is extended to wells in reservoirs with double-porosity behaviour. Solutions are obtained for either pseudo-steady state or transient interporosity flow. The distinctive specific features of both solutions are identified. Results presented are applicable to both naturally-fractured and layered reservoirs with the more permeable layer connecting to the wellbore. Type curves based on the pseudo-steady or t… more
Date: December 15, 1983
Creator: Mateen, Khalid & Ramey, Henry J. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Some Comments on the La Primavera Geothermal Field, Mexico

Description: The La Primavera geothermal field is located about 20 km west of the city of Guadalajara, Jalisco, in the western part of the Mexican Neovolcanic Axis. Initial results of five deep exploration wells (down to 2000 m depth) were very promising; measured downhole temperatures exceed 300{degrees}C. During production, however, downhole temperatures dropped, and the chemistry of the fluids changed. The analysis of geologic, mineralogic, geochemical, and well completion data indicate that colder fluid… more
Date: December 15, 1983
Creator: A., Bernardo Dominguez & Lippmann, Marcelo J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Status Report on the Exploitation Conditions of the Ahuachapan Geothermal Field

Description: The present exploitation conditions of the Ahuachapan field are discussed. The high well density in a small area has resulted in a significant reservoir pressure decrease due to the inherent reservoir over-exploitation. The average pressure in the exploitation zone has decreased from the 1975 value of 34 kg/cm{sup 2} to the May 1983 value of 23 kg/cm{sup 2}. The production decline characteristics of the Ahuachapan wells were examined, concluding that all wells but Ah-22 show exponential decline… more
Date: December 15, 1983
Creator: Rivera-R., Jesus; Vides-R., Alberto; Cuellar, Gustavo; Samaniego-V., Fernando & Neri-I, Gustavo
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Summary of Geothermal Exploration and Data from Stratigraphic Test Well No. 1 Makushin Volcano, Unalaska Island

Description: Geothermal resource investigations have been conducted for the past four years on Unalaska Island in the Aleutian Chain. The focus of the work has been Makushin Volcano, about 12 miles from the cities of Unalaska and Dutch Harbor. In the summer of 1982, three widely spaced deep temperature gradient holes were drilled which encountered high temperatures. During the summer of 1983, a three inch diameter "slim hole" well, ST-1, was drilled to 1,949 feet. A shallow, low pressure, steam zone and a r… more
Date: December 15, 1983
Creator: Campbell, Don A. & Economides, Michael J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Temperatures and interval geothermal-gradient determinations from wells in National Petroleum Reserve in Alaska

Description: Temperature and related records from 28 wells in the National Petroleum Reserve in Alaska (NPRA) although somewhat constrained from accuracy by data gathering methods, extrapolate to undisturbed formation temperatures at specific depths below permafrost, and lead to calculated geothermal graidents between these depths. Tabulation of the results show that extrapolated undisturbed temperatures range from a minimum of 98/sup 0/F (37/sup 0/C) at 4000 feet (1220 m) to a maximum of 420/sup 0/F (216/s… more
Date: December 15, 1983
Creator: Blanchard, D.C. & Tailleur, I.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal Expansion Behavior of Cerro Prieto Sandstones and Other Sedimentary Rocks Under Stress

Description: This paper describes the experimental work and presents the results of a research program carried out to investigate the thermal expansion behavior of sedimentary rocks under high stress conditions. The aspects that were investigated include the effects of temperature, temperature cycling, and confining pressure. Furthermore, the validity of the usual assumption on thermal expansion isotropy was investigated. On the other hand, the matrix thermal expansion concept is analyzed and its physical m… more
Date: December 15, 1983
Creator: Contreras, E. & Bermejo, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tracer Recovery and Mixing from Two Geothermal Injection-Backflow Studies

Description: Injection-backflow tracer testing on a single well is not a commonly used procedure for geothermal reservoir evaluation, and, consequently, there is little published information on the character or interpretation of tracer recovery curves. Two field experiments were conducted to develop chemical tracer procedures for use with injection-backflow testing, one on the fracture-permeability Raft River reservoir and the other on the matrix-permeability East Mesa reservoir. Results from tests conducte… more
Date: December 15, 1983
Creator: Capuano, R. M.; Adams, M. C. & Wright, P. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Variation of Fracturing Pressures with Depth Near the Valles Caldera

Description: Hydraulic Fracturing at the Fenton Hill Hot Dry Rock Geothermal site near the Valles Caldera has yielded fracturing pressures from 14 to 81 MPa (2030 to 11,750 psi) at depths ranging from 0.7 to 4.4 km (2250 to 14,400 ft). This data can be fit to a fracture gradient of 19 MPa/km (0.84 psi/ft), except for an anomalous region between 2.6 to 3.2 km where fracturing pressures are about 20 MPa lower than estiamted using the above gradient. This anomaly coincides with a biotite granodiorite intrusive… more
Date: December 15, 1983
Creator: Dash, Zora & Murphy, Hugh
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Well Test Analysis in Naturally Fissured, Geothermal Reservoirs with Fracture Skin

Description: Mineral deposition or alteration is commonly found at fracture-block interfaces is fissured, geothermal reservoirs. In response to pressure reduction in the fissures such mineralization, if less permeable than the matrix rock, will retard the flow of fluid from the blocks to the fissures and is termed fracture skin in this paper. The problem of fluid flow to a production well in a double-porosity reservoir with fracture skin was analyzed theoretically. One of the findings of the analysis was th… more
Date: December 15, 1983
Creator: Moench, A. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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