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Random choice method for calculating fluid displacement in a porous medium

Description: Multiphase fluid displacement in a porous medium gives rise naturally to the occurrence of steep fronts, for example between different fluids or between regions of differing chemical concentrations. Such fronts pose substantial difficulty for most numerical methods. However, the recently developed random choice numerical method has been found capable of following effectively even perfectly sharp fronts. An application to the calculation of immiscible displacement in a petroleum reservoir is dis… more
Date: June 1, 1980
Creator: Albright, N.; Anderson, C. & Concus, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Investigation and evaluation of geopressured-geothermal wells. Fairfax Foster Sutter No. 2 well, St. Mary Parish, Louisiana. Volume I. Completion and testing. Final report

Description: The Fairfax Foster Sutter No. 2 well, located in the East Franklin area of St. Mary Parish, Louisiana, is the first successful test of a geopressured-geothermal aquifer under the Well-of-Opportunity program. The section tested was the MA-6 sand of lower Miocene age which has produced large quantities of gas from the adjacent but structurally separated Garden City field. In the subject well the observed temperature was 270{sup 0}F (132{sup 0}C) and the measured gradient was 0.77 psi/ft. The gros… more
Date: December 1, 1979
Creator: Willits, M. H.; McCoy, R. L.; Dobson, R. J. & Hartsock, J. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A systematic procedure for reservoir characterization: Annual report for the period October 1, 1985-September 30, 1986

Description: This report deals with a variety of topics all centered around the main goal of making numerical reservoir simulation results conform more closely with geologic descriptions. The first part of the report discusses results on conditional simulations of miscible displacements in randomly heterogeneous permeable media. The focus here is on local or macroscopic dispersion, the dispersion experienced at a fixed point in the medium. Macroscopic dispersivity has many of the same dependencies on reserv… more
Date: December 1, 1987
Creator: Lake, L.W.; Kocurek, G.A. & Miller, M.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent progress in HDR reservoir engineering

Description: In the past two years, three very significant advances have been made in our understanding of the behavior and properties of Hot Dry Rock (HDR) geothermal reservoirs. First, we have determined that the rate of water loss from such deep, engineered reservoirs -- previously thought to be a major problem -- is minimal in the absence of reservoir growth, even under considerably elevated operating pressures. Second, a new method has been developed for determining the volume of hot fractured rock acc… more
Date: January 1, 1991
Creator: Brown, D. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Borehole radar for geothermal applications

Description: An initial evaluation of a continuous wave borehole radar system with steerable antennas has been completed. Candidate antennas have been identified which meet the size requirements for borehole applications. The patterns of these antennas are not dependent on the properties of the surrounding media when the antenna dimensions are less than one-tenth wavelength. The beam patterns can be steered adequately to allow the volume of earth within several meters of a borehole to be investigated. 7 ref… more
Date: January 1, 1991
Creator: Scott, M.W. & Caffey, T.W.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of non-condensible gases on fluid recovery in fractured geothermal reservoirs

Description: Numerical simulations are performed in order to investigate the effects of noncondensible gases (CO/sub 2/) on fluid recovery and matrix depletion in fractured geothermal reservoirs. The model used is that of a well producing at a constant bottomhole pressure from a two-phase fractured reservoir. The results obtained have received a complex fracture-matrix interaction due to the thermodynamics of H/sub 2/O-CO/sub 2/ mixtures. Although the matrix initially contributes fluids (liquid and gas) to … more
Date: February 1, 1986
Creator: Bodvarsson, G.S. & Gaulke, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Simulation of pore scale porous media flow using lattice gas methods

Description: Carbon dioxide-foam injection is an important technique for improving the recovery of oil from porous rocks. Huh, et. al. (1989) recently presented results of two-dimensional laboratory micromodel studies conducted to better understand this process for improved oil recovery. These experimental results indicate that the introduction of CO{sub 2} foam may be expected to have a substantial effect on the relative permeability curves that would be used to model improved oil recovery in a reservoir. … more
Date: January 1, 1991
Creator: Eggert, K.; Chen, Shiyi; Travis, B.; Grunau, D. (Los Alamos National Lab., NM (USA)); Loh, E. (Thinking Machines Corp., Cambridge, MA (USA)) & Kovarik, F. (Houston Univ., TX (USA). Inst. for Improved Oil Recovery Research)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improvement of sweep efficiency and mobility control in gas flooding

Description: The application of carbon dioxide or other gases to extract crude oil from depleted reservoirs has been shown to be a technically successful process. However, optimized recoveries are often compromised by poor sweep efficiencies because of low gas viscosities and densities. A new process was investigated that potentially could improve sweep efficiencies by enhancing extractability properties of the injected gas with entrainers. Use of a capillary viscometer to evaluate enhanced viscosities appe… more
Date: April 1, 1991
Creator: Strycker, A. & Llave, F.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal numerical simulator for laboratory evaluation of steamflood oil recovery

Description: A thermal numerical simulator running on an IBM AT compatible personal computer is described. The simulator was designed to assist laboratory design and evaluation of steamflood oil recovery. An overview of the historical evolution of numerical thermal simulation, NIPER's approach to solving these problems with a desk top computer, the derivation of equations and a description of approaches used to solve these equations, and verification of the simulator using published data sets and sensitivit… more
Date: April 1, 1991
Creator: Sarathi, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of reservior heterogeneities on waterflood and EOR chemical flood performance

Description: Simulations were performed to study the capability of a modified version of the black oil simulator BOAST to handle reservoir heterogeneities of the type encountered in the barrier bar depositional system studied in the geoscience research program being performed for the Department of Energy as project BE1. The cases studied consisted of two-dimensional and three-dimensional simulations of layered reservoirs with different permeability contracts between the layers, different vertical permeabili… more
Date: October 1, 1988
Creator: Tomutsa, L. & Knight, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The use of Ahuachapan fluid chemistry to indicate natural state conditions and reservoir processes during exploitation

Description: Chemical analyses of production fluids from Ahuachapan, El Salvador, have been used to indicate natural state reservoir fluid temperatures and chloride concentrations and reservoir processes resulting from exploitation. Geothermometer temperatures (Na--K--Ca and SiO{sub 2}) and calculated aquifer Cl for early flows show a gradient from about 265{degree}C and 9000 ppM Cl in the western part of the well field to 235{degree}C and 6000 ppM Cl in the eastern part. The geochemical temperatures are 10… more
Date: January 1, 1989
Creator: Treusdell, A. H.; Aunzo, Z.; Bodvarsson, G.; Alonso, J. & Campos, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beneficial effects of groundwater entry into liquid-dominated geothermal systems

Description: In all active liquid-dominated geothermal systems there is continuous circulation of mass and transfer of heat, otherwise they would slowly cool and fade away. In the natural state these systems are in dynamic equilibrium with the surrounding colder groundwater aquifers. The ascending geothermal fluids cool conductively, boil, or mix with groundwaters, and ultimately may discharge at the surface as fumaroles or hot springs. With the start of fluid production and the lowering of reservoir pressu… more
Date: April 1, 1990
Creator: Lippmann, M.J. (Lawrence Berkeley Lab., CA (USA)) & Truesdell, A.H. (Geological Survey, Menlo Park, CA (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An evaluation of the geothermal potential of the Tecuamburro Volcano area of Guatemala

Description: Radiometric ages indicate that the Tecuamburro Volcano and three adjacent lava domes grew during the last 38,300 years, and that a 360-m-wide phreatic crater, Laguna Ixpaco, was formed near the base of these domes about 2900 years ago. Laguna Ixpaco is located within the Chupadero crater, from which pyroxene pumice deposits were erupted 38,300 years ago. Thus, the likelihood is great for a partly molten or solid-but-still-hot near-surface intrusion beneath the area. Fumaroles and hot springs is… more
Date: September 1, 1990
Creator: Heiken, G. & Duffield, W. (eds.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Validation status of the VARGOW oil reservoir model

Description: VARGOW, a variable gas-oil-water reservoir model, provides recovery estimates suitable for assessing various reservoir production policies and regulations. Data were collected for a number of reservoirs. From this data base, three reservoirs approximating the model assumptions were selected for model testing purposes. For all three reservoirs, it has been possible to simulate the observed pressures in both interpolative and extrapolative modes. Simulating the gas/oil ratio (GOR) has not been as… more
Date: October 1, 1980
Creator: Mayer, D. W.; Arnold, E. M.; Bowen, W. M. & Gutknecht, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of Oil and Gas Reservoir Heterogeneity. [Quarterly Report], January 1, 1993--March 31, 1993

Description: The ultimate objective of this cooperative research project is to characterize Alaskan petroleum reservoirs in terms of their reserves, physical and chemical properties, geologic configuration in relation to lithofacies and structure, and development potential. The project has two tasks: Task I is a geological description of the reservoirs including petrophysical properties, i.e., porosity, permeability, permeability variation, formation depth, temperature, and net pay, facies changes and reser… more
Date: April 1, 1993
Creator: Sharma, G. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of Hydrocarbon Miscible Solvent Slug Injection Process for Improved Recovery of Heavy Oil From Schrader Bluff Pool, Milne Point Unit, Alaska. [Quarterly] Report, January 1, 1993--March 31, 1993

Description: The ultimate objective of this three-year research project is to evaluate the performance of the hydrocarbon miscible solvent slug process and to assess the feasibility of this process for improving recovery of heavy oil from Schrader Bluff reservoir. This will be accomplished through measurement of PVT and fluid properties of Schrader Bluff oil, determination of phase behavior of Schrader Bluff oil solvent mixtures, asphaltene precipitation tests, slim tube displacement tests, core flood exper… more
Date: June 1, 1993
Creator: Sharma, G. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The crosswell electromagnetic response of layered media

Description: Crosswell electromagnetic measurements are a promising new geophysical technique for mapping subsurface electrical conductivity which can provide information about the subsurface distribution of water, oil or steam. In this work the fields from a low frequency vertical magnetic dipole have been examined from the specific point of view of their application to the determination of the conductivity of a layered medium. The source and the receiver were placed inside two separate boreholes. The rang… more
Date: April 1, 1994
Creator: Deszcz-Pan, M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Characterization of Oil and Gas Reservoir Heterogeneity. [Quarterly Technical Progress Report], April 1, 1993--June 30, 1993

Description: The ultimate objective of this cooperative research project is to characterize Alaskan petroleum reservoirs in terms of their reserves, physical and chemical properties, geologic configuration in relation to lithofacies and structure, and development potential. The project has two tasks: Task I is a geological description of the reservoirs including petrophysical properties, i.e., porosity, permeability, permeability variation, formation depth, temperature, and net pay, facies changes and reser… more
Date: August 1, 1993
Creator: Sharma, G. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Parametric study of reservoir properties and their effect on energy recovery

Description: Geothermal energy constitutes an important energy resource worldwide. Effective management of such a resource requires an understanding of a complex set of physical phenomena, including interphase mass transfer, convective transport of mass, and conduction and convection of energy. The coupled nature of these processes frequently requires that numerical simulation be used to investigate reservoir response to different management strategies. The first stage of designing a simulation a particular… more
Date: August 1, 1992
Creator: Shook, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geophysical investigation: New Production Reactor Complex, Idaho National Engineering Laboratory

Description: Seismic crosshole and downhole velocity measurements were performed for two borehole arrays approximately 300 feet deep in conjunction with verticality measurements and geophysical logging of borehole WO-2 (to a depth of 4,960 feet) at the NPR site of the INEL. Past studies show that the site area is covered by a thin layer of soil which overlies numerous basalt flows interrupted by sandy and clayey interbeds. Compressional and shear wave velocities computed for these arrays revealed low veloci… more
Date: December 1, 1991
Creator: Filipkowski, F.; Blackey, M.; Davies, D.; Levine, E. N. & Murphy, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Model study of historical injection in the southeast Geysers

Description: A three component model study of the historical injection of two wells in the Unit 13 area demonstrates that the recovery of injection derived steam is influenced by the geologic structure of the bottom of the reservoir and the relative location of injection wells. The migration of injectate from the first injection well, located up structure from the second, quenched the area around the second injector before it started operation. While both wells had similar cumulative mass injected, nearly f… more
Date: August 1, 1992
Creator: Faulder, D. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Characterization of reservoir rocks and fluids by surface electromagnetic transient methods

Description: The objectives of this research are to improve the interpretations of transient electromagnetic (TEM) measurements over two-dimensional subsurface structures. TEM is a surface electromagnetic method employed in fossil energy reservoir exploration and characterization. Electrical measurements find application in (i) assisting in fossil energy exploration mainly in areas where seismic methods yield inadequate data quality, such as volcanic covered terrain, permafrost areas, and the Rocky Mountain… more
Date: January 1, 1992
Creator: Hoekstra, P.; Blohm, M. W. (Blackhawk Geosciences, Inc., Golden, CO (United States)); Stoyer, C. H. (Interpex Ltd. (United States)) & James, B. A. (James Consulting Services (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of Oil and Gas Reservoir Heterogeneity

Description: The ultimate objective of this cooperative research project is to characterize Alaskan petroleum reservoirs in terms of their reserves, physical and chemical properties, geologic configuration in relation to lithofacies and structure, and development potential. The project has two tasks: Task 1 is a geological description of the reservoirs including petrophysical properties, i.e., porosity, permeability, permeability variation, formation depth, temperature, and net pay, facies changes and reser… more
Date: January 1, 1992
Creator: Sharma, G. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Generalization of vapor pressure lowering effects in an existing geothermal simulator

Description: Thermodynamic properties of pore water are shown to be different from those of bulk water because of interfacial forces between the aqueous and solid phases. This {open_quotes}vapor-pressure lowering{close_quotes} (VPL) effect is described through Kelvin`s equation, which relates VPL to properties of the liquid phase. An algorithm that accounts for VPL had previously been implented in the geothermal simulator TETRAD. This algorithm applies to a narrow range of reservoir properties, and in some … more
Date: June 1, 1993
Creator: Shook, G. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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