Search Results

Advanced search parameters have been applied.
open access

Hot-dry-rock feasibility study

Description: The hot-dry-rock project tasks are covered as follows: hot-dry-rock reservoir; generation facilities; water resources; transmission requirements; environmental issues; government and community institutional factors; leasing, ownership and management of facilities; regulations, permits, and laws; and financial considerations. (MHR)
Date: August 1, 1981
Partner: UNT Libraries Government Documents Department
open access

Thermal depletion of a geothermal reservoir with both fracture and pore permeability

Description: A method for estimating the useful lifetime of a reservoir in porous rock where the injection and production wells intersect a fracture system is presented. Equations were derived for the pore-fluid and fracture-fluid temperatures averaged over large regions of the geothermal field. Problems such as incomplete areal sweep and interfingering of cool and hot fluids are ignored. Approximate equations relating average temperatures to the heat flowing from rock to fluid were developed, and their use… more
Date: August 10, 1976
Creator: Kasameyer, P.W. & Schroeder, R.C.
Partner: UNT Libraries Government Documents Department
open access

Hot Dry Rock Geothermal Energy Development Program. Annual report, fiscal year 1979

Description: The Fenton Hill Project is still the principal center for developing methods, equipment, and instrumentation for creating and utilizing HDR geothermal reservoirs. The search for a second site for a similar experimental system in a different geological environment has been intensified, as have the identification and characterization of other HDR areas that may prove suitable for either experimental or commercial development. The Phase I fracture system was enlarged during FY79. Drilling of the i… more
Date: August 1, 1980
Creator: Cremer, G. M.; Duffield, R. B.; Smith, M. C. & Wilson, M. G.
Partner: UNT Libraries Government Documents Department
open access

Pressure transient method for front tracking

Description: A pressure transient technique for tracking the advance of cold water fronts during water flooding and goethermal injection operations has been developed. The technique is based on the concept that the steady state pressure buildup in the reservoir region inside the front can be calculated by a fluid skin factor. By analyzing successive pressure falloff tests, the advance of the front in the reservoir can be monitored. The validity of the methods is demonstrated by application to three numerica… more
Date: August 1, 1983
Creator: Benson, S.M. & Bodvarsson, G.S.
Partner: UNT Libraries Government Documents Department
open access

TOUGH User's Guide

Description: This document contains a technical description of the TOUGH computer program, which was developed at Lawrence Berkeley Laboratory for simulating the coupled transport of water, vapor, air and heat in porous and fractured media. The physical processes taken into account in TOUGH are discussed, and the governing equations actually solved by the simulator are stated in full detail. A brief overview is given of the mathematical and numerical methods, and the code architecture. The report provides d… more
Date: August 1, 1987
Creator: Pruess, K.
Partner: UNT Libraries Government Documents Department
open access

Characterization of fluid flow in naturally fractured reservoirs. Final report

Description: This report summarizes the results of a four month study of the characteristics of multiphase flow in naturally fractured porous media. An assessment and evaluation of the literature was carried out and a comprehensive list of references compiled on the subject. Mathematical models presented in the various references cited were evaluated along with the stated assumptions or those inherent in the equations. Particular attention was focused upon identifying unique approaches which would lead to t… more
Date: August 1, 1981
Creator: Evans, R.D.
Partner: UNT Libraries Government Documents Department
open access

Subsurface fracture mapping from geothermal wellbores. Final report

Description: To advance the state-of-the-art in Hot Dry Rock technology, and evaluation is made of (1) the use of both electromagnetic and acoustic radar to map far-field fractures, (2) the use of more than twenty different conventional well logging tools to map borehole-fracture intercepts, (3) the use of magnetic dipole ranging to determine the relative positions of the injection well and the production well within the fractured zone, (4) the use of passive microseismic methods to determine the orientatio… more
Date: August 1, 1983
Creator: Hartenbaum, B.A. & Rawson, G.
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.
Partner: UNT Libraries Government Documents Department
open access

Parallel, Multigrid Finite Element Simulator for Fractured/Faulted and Other Complex Reservoirs based on Common Component Architecture (CCA)

Description: Black-oil, compositional and thermal simulators have been developed to address different physical processes in reservoir simulation. A number of different types of discretization methods have also been proposed to address issues related to representing the complex reservoir geometry. These methods are more significant for fractured reservoirs where the geometry can be particularly challenging. In this project, a general modular framework for reservoir simulation was developed, wherein the physi… more
Date: August 31, 2008
Creator: Deo, Milind; Huang, Chung-Kan & Wang, Huabing
Partner: UNT Libraries Government Documents Department
open access

An integrated methodology for characterizing flow and transport processes in fractured rock

Description: To investigate the coupled processes involved in fluid andheat flow and chemical transport in the highly heterogeneous,unsaturated-zone (UZ) fractured rock of Yucca Mountain, we present anintegrated modeling methodology. This approach integrates a wide varietyof moisture, pneumatic, thermal, and geochemical isotopic field data intoa comprehensive three-dimensional numerical model for modeling analyses.The results of field applications of the methodology show that moisturedata, such as water pot… more
Date: August 31, 2007
Creator: Wu, Yu-Shu
Partner: UNT Libraries Government Documents Department
open access

An Integrated Approach to Characterizing Bypassed Oil in Heterogeneous and Fractured Reservoirs Using Partitioning Tracers

Description: This report presents an efficient trajectory-based approach to integrate transient pressure data into high-resolution reservoir and aquifer models. The method involves alternating travel time and peak amplitude matching of pressure response using inverse modeling and is particularly well-suited for high resolution subsurface characterization using hydraulic tomography or pressure interference tests. Compared to travel time inversion only, our proposed approach results in a significantly improve… more
Date: August 1, 2006
Creator: Datta-Gupta, Akhil
Partner: UNT Libraries Government Documents Department
open access

CHARACTERIZATION OF IN-SITU STRESS AND PERMEABILITY IN FRACTURED RESERVOIRS

Description: During the past six months we have adapted our 3-D elastic, anisotropic finite difference code by implementing the rotated staggered grid (RSG) method to more accurately represent large contrasts of elastic moduli between the fractures and surrounding formation, and applying the perfectly matched layer (PML) absorbing boundary condition to minimize boundary reflections. Two approaches for estimating fracture spacing from scattered seismic energy were developed. The first relates notches in the … more
Date: August 1, 2005
Creator: Burns, Daniel R. & Toksoz, M. Nafi
Partner: UNT Libraries Government Documents Department
open access

AN INTEGRATED APPROACH TO CHARACTERIZING BYPASSED OIL IN HETEROGENEOUS AND FRACTURED RESERVOIRS USING PARTITIONING TRACERS

Description: We explore the use of efficient streamline-based simulation approaches for modeling partitioning interwell tracer tests in hydrocarbon reservoirs. Specifically, we utilize the unique features of streamline models to develop an efficient approach for interpretation and history matching of field tracer response. A critical aspect here is the underdetermined and highly ill-posed nature of the associated inverse problems. We have adopted an integrated approach whereby we combine data from multiple … more
Date: August 1, 2003
Creator: Datta-Gupta, Akhil
Partner: UNT Libraries Government Documents Department
open access

AN INTEGRATED APPROACH TO CHARACTERIZING BYPASSED OIL IN HETEROGENEOUS AND FRACTURED RESERVOIRS USING PARTITIONING TRACERS

Description: We explore the use of efficient streamline-based simulation approaches for modeling and analysis partitioning interwell tracer tests in heterogeneous and fractured hydrocarbon reservoirs. The streamline approach is generalized to model water injection in naturally fractured reservoirs through the use of a dual media approach. The fractures and matrix are treated as separate continua that are connected through a transfer function, as in conventional finite difference simulators for modeling frac… more
Date: August 1, 2004
Creator: Datta-Gupta, Akhil
Partner: UNT Libraries Government Documents Department
open access

Massively parallel computing simulation of fluid flow in the unsaturated zone of Yucca Mountain, Nevada

Description: This paper presents the application of parallel computing techniques to large-scale modeling of fluid flow in the unsaturated zone (UZ) at Yucca Mountain, Nevada. In this study, parallel computing techniques, as implemented into the TOUGH2 code, are applied in large-scale numerical simulations on a distributed-memory parallel computer. The modeling study has been conducted using an over-one-million-cell three-dimensional numerical model, which incorporates a wide variety of field data for the h… more
Date: August 31, 2001
Creator: Zhang, Keni; Wu, Yu-Shu & Bodvarsson, G. S.
Partner: UNT Libraries Government Documents Department
open access

CT Measurements of Two-Phase Flow in Fractured Porous Media

Description: This report describes the design, construction, and preliminary results of an experiment that studies imbibition displacement in two fracture blocks. Multiphase (oil/water) displacements will be conducted at the same rate on three core configurations. The configurations are a compact core, a two-block system with a 1 mm spacer between the blocks, and a two-block system with no spacer. The blocks are sealed in epoxy so that saturation measurements can be made throughout the displacement experime… more
Date: August 9, 1999
Creator: Brigham, William E.; M., Castanier Louis & Hughes, Richard G.
Partner: UNT Libraries Government Documents Department
open access

Experimental and Theoretical Investigation of Multiphase Flow in Fractured Porous media, SUPRI TR-116, Topical Report

Description: The fluid transfer parameters between rock matrix and fracture are not well known. Consequently, simulation of fractured reservoirs uses, in general, very crude and unproven hypotheses such as zero capillary pressure in the fracture and/or relative permeability linear with saturation. In order to improve the understanding of flow in fractured media, an experimental study was conducted and numerical simulations of the experiments were made. A laboratory flow apparatus was built to obtain data on… more
Date: August 9, 1999
Creator: Akin, Serhat; Castanier, Louis M. & German, Edgar Rene Rangel
Partner: UNT Libraries Government Documents Department
open access

Rationale for finding and exploiting fractured reservoirs, based on the MWX/SHCT-Piceance basin experience

Description: The deliverability of a reservoir depends primarily on its permeability, which, in many reservoirs, is controlled by a combination of natural fractures and the in situ stresses. Therefore it is important to be able to predict which parts of a basin are most likely to contain naturally fractured strata, what the characteristics of those fractures might be, and what the most likely in situ stresses are at a given location. This paper presents a set of geologic criteria that can be superimposed on… more
Date: August 1, 1993
Creator: Lorenz, J. C.; Warpinski, N. R. & Teufel, L. W.
Partner: UNT Libraries Government Documents Department
open access

On-line Optimization-Based Simulators for Fractured and Non-fractured Reservoirs

Description: Oil field development is a multi-million dollar business. Reservoir simulation is often used to guide the field management and development process. Reservoir characterization and geologic modeling tools have become increasingly sophisticated. As a result the geologic models produced are complex. Most reservoirs are fractured to a certain extent. The new geologic characterization methods are making it possible to map features such as faults and fractures, field-wide. Significant progress has bee… more
Date: August 31, 2005
Creator: Deo, Milind D.
Partner: UNT Libraries Government Documents Department
open access

An Integrated Approach to Characterizing Bypassed Oil in Heterogeneous and Fractured Reservoirs Using Partitioning Tracers

Description: We explore the use of efficient streamline-based simulation approaches for modeling and analysis partitioning interwell tracer tests in heterogeneous and fractured hydrocarbon reservoirs. We compare the streamline-based history matching techniques developed during the first two years of the project with the industry standard assisted history matching. We enhance the widely used assisted history matching in two important aspects that can significantly improve its efficiency and effectiveness. Fi… more
Date: August 1, 2005
Creator: Datta-Gupta, Akhil
Partner: UNT Libraries Government Documents Department
open access

Scoping calculations for groundwater transport of tritium from the Gnome Site, New Mexico

Description: Analytic solutions are employed to investigate potential groundwater transport of tritium from a radioactive tracer site near the Project Gnome site in southeastern New Mexico. The tracer test was conducted in 1963 and introduced significant quantities of radionuclides to the transmissive and laterally continuous Culebra dolomite. Groundwater in the Culebra near Gnome travels toward a regional discharge point at the Pecos River, a distance of about 10 to 15 km, depending on flow path. Groundwat… more
Date: August 1, 1994
Creator: Pohlmann, K. & Andricevic, R.
Partner: UNT Libraries Government Documents Department
open access

An Advanced Fracture Characterization and Well Path Navigation System for Effective Re-Development and Enhancement of Ultimate Recovery From the Complex Monterey Reservoir of South Ellwood Field, Offshore California

Description: Venoco Inc, intends to re-develop the Monterey Formation, a Class III basin reservoir, at South Ellwood Field, Offshore Santa Barbara, California. Well productivity in this field varies significantly. Cumulative Monterey production for individual wells has ranged from 260 STB to 8,700,000 STB. Productivity is primarily affected by how well the well path connects with the local fracture system and the degree of aquifer support. Cumulative oil recovery to date is a small percentage of the origina… more
Date: August 1, 2005
Creator: Horner, Steve
Partner: UNT Libraries Government Documents Department
open access

Modeling, design, and life performance prediction for energy production from geothermal reservoirs. August 1997 progress report

Description: The objective of this project is to both transfer existing Hot Dry Rock two-dimensional fractured reservoir analysis capability to the geothermal industry and to extend the analysis concepts to three dimensions. In this quarter, the primary focus has been on interaction with industry, development of the Geocrack3D model, and maintenance of Geocrack2D. It is important to emphasize that the modeling is complementary to current industry modeling, in that they focus on flow in fractured rock and on… more
Date: 1997-08~
Creator: Swenson, Daniel
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the radionuclide tracer test conducted at the project Gnome Underground Nuclear Test Site, New Mexico

Description: A radionuclide tracer test was conducted in 1963 by the U.S. Geological Survey at the Project Gnome underground nuclear test site, approximately 40 km southeast of Carlsbad, New Mexico. The tracer study was carried out under the auspices of the U.S. Atomic Energy Commission (AEC) to study the transport behavior of radionuclides in fractured rock aquifers. The Culebra Dolomite was chosen for the test because it was considered to be a reasonable analogue of the fractured carbonate aquifer at the … more
Date: August 1, 1996
Creator: Pohll, G. & Pohlmann, K.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen