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in publisher: "Stanford University"

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The Effect of Temperature on the Absolute Permeability to Distilled Water of Unconsolidated Sand Cores

The work presented herein is a study of the effect of temperature on the absolute permeability to distilled water of unconsolidated sandstones at one confining pressure. The absolute permeability to distilled water of Ottawa silica sand was not dependent on the temperature level.

Date: December 16, 1980

Creator: Sageev, A.; Gobran, B.D.; Brigham, W.E. & Ramey, H.J. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The effects of CO{sub 2} on steam adsorption

Water adsorption in geothermal reservoir materials was investigated by transient flow technique using steam and COz gas. Theoretical and experimental results indicate that water adsorption exists in vapordominated type of reservoir, but experiments in the past have been limited to pure gases. The common presence of CO2, a non-condensible gas, in a geothermal reservoir necessitated a study of the effect of partial CO2 concentration on adsorption. Experimental laboratory work using a crushed Geys… more

Date: January 20, 1994

Creator: Palar, Steve & Horne, Roland N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hydrocarbon anomaly in soil gas as near-surface expressions of upflows and outflows in geothermal systems

A variety of hydrocarbons, C<sub>1</sub> - C<sub>12</sub>, have been found in volcanic gases (fumarolic) and in geothermal waters and gases. The hydrocarbons are thought to have come from products of pyrolysis of kerogen in sedimentary rocks or they could be fed into the geothermal system by the recharging waters which may contain dissolved hydrocarbons or hydrocarbons extracted by the waters from the rocks. In the hot geothermal zone, 300°+ C, many of these hydrocarbons are in their critical s… more

Date: January 24, 1996

Creator: Ong, H. L.; Higashihara, M.; Klusman, R. W.; Voorhees, K. J.; Pudjianto, R. & Ong, J

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Constant-pressure measurement of steam-water relative permeability

A series of steady-state experiments have established relative permeability curves for two-phase flow of water in a porous medium. These experiments have minimized uncertainty in pressure, heat loss, and saturation. By attempting to maintain a constant pressure gradient, the experiments have provided a baseline from which to determine the effect of temperature on relative permeability. The use of a flexible heater with an automatic control system made it possible to assume negligible phase chan… more

Date: June 1, 2001

Creator: O'Connor, Peter A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Experimental Investigation and High Resolution Simulator of In-Situ Combustion Processes

Accurate simulation of in-situ combustion processes is computationally very challenging because the spatial and temporal scales over which the combustion process takes place are very small. In this current and fourteenth report, we report on our continued numerical experimentation with the Virtual Kinetic Cell and our continuing experimental program.

Date: March 31, 2007

Creator: Gerritsen, Margot & Kovscek, Anthony

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Field-Scale Evaluation of Biostimulation for Remediation of Uranium-Contaminated Groundwater at a Proposed NABIR Field Research Center in Oak Ridge, TN

A hydrologic, geochemical and microbial characterization of the Area 3 field site has been completed. The formation is fairly impermeable, but there is a region of adequate flow approximately 50 feet bgs. The experiment will be undertaken within that depth interval. Groundwater from that depth is highly acidic (pH 3.2), and has high levels of nitrate, aluminum, uranium, and other heavy metals, as well as volatile chlorinated solvents (VOCs). Accordingly, an aboveground treatment train has been … more

Date: June 1, 2003

Creator: Criddle, Craig S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

FIELD DEVELOPMENT AND POWER GENERATION IN KIZILDERE, TURKEY

Turkey is classified among countries which have high geothermal energy potential. Geological and geophysical explorations are continuing in promising areas. However primary emphasis was given to Western Anatolia during the last decade. As a result of these efforts Kizildere field was developed and power plant was put into operation in February 14, 1984. This paper summarizes the power plant, production problems encountered in wells during the last nine months and future field development plans.

Date: January 22, 1985

Creator: Okandan, E, & Polat, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Boiling radial flow in fractures of varying wall porosity

The focus of this report is the coupling of conductive heat transfer and boiling convective heat transfer, with boiling flow in a rock fracture. A series of experiments observed differences in boiling regimes and behavior, and attempted to quantify a boiling convection coefficient. The experimental study involved boiling radial flow in a simulated fracture, bounded by a variety of materials. Nonporous and impermeable aluminum, highly porous and permeable Berea sandstone, and minimally porous an… more

Date: June 1, 2000

Creator: Barnitt, Robb Allan

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Enabling Advanced Modeling and Simulations for Fuel-Flexible Combustors

The overall goal of the present project is to enable advanced modeling and simulations for the design and optimization of fuel-flexible turbine combustors. For this purpose we use a high fidelity, extensively-tested large-eddy simulation (LES) code and state-of-the-art models for premixed/partially-premixed turbulent combustion developed in the PI's group. In the frame of the present project, these techniques are applied, assessed, and improved for hydrogen enriched premixed and partially premi… more

Date: May 31, 2010

Creator: Pitsch, Heinz

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Streamline Approach for History-Matching Production Data

This study proposes and develops a streamline approach for inferring field-scale effective permeability distributions based on dynamic production data including producer water-cut curve, well pressures, and rates. The streamline-based inverse approach simplifies the history-matching process significantly. The basic idea is to relate the water-cut curve at a producer to the water breakthrough of individual streamlines. By adjusting the effective permeability along streamlines, the breakthrough t… more

Date: June 1, 2001

Creator: Wang, Yuandong & Kovscek, Anthony R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs Quarterly Report

This report outlines progress in the second 3 months of the first year of the DOE project ''High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs.'' The development of an automatic technique for analytical solution of one-dimensional gas flow problems with volume change on mixing is described. The aim of this work is to develop a set of ultra-fast compositional simulation tools that can be used to make field-scale predictions of the performance of gas inje… more

Date: March 31, 2001

Creator: Orr, Franklin M., Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs Quarterly Report

This report outlines progress in the third 3 quarter of the first year of the DOE project ''High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs.'' A simple theoretical formulation of vertical flow with capillary/gravity equilibrium is described. Also reported are results of experimental measurements for the same systems. The results reported indicate that displacement behavior is strongly affected by the interfacial tension of phases that form on the tie… more

Date: June 30, 2001

Creator: Orr, Franklin M., Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Coupled Geochemical and Hydrological Processes Governing the Fate and Transport of Radionuclides and Toxic Metals Beneath the Hanford Tank Farms

Project Objective: (1) Provide an improved understanding of how preferential vertical and lateral flow, and the formation of immobile water influence the transport of radionuclides and toxic metals in heterogeneous, laminated sediments. (2) Quantify the rates and mechanisms of radionuclide and toxic metal interaction with the solid phase under various hydrologic conditions. (3) Provide new insights into how physical and mineralogical heterogeneities (e.g. stratification, pore regime connectivit… more

Date: June 1, 2003

Creator: Fendorf, Scott E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

STRUCTURAL HETEROGENEITIES AND PALEO FLUID FLOW IN AN ANALOG SANDSTONE RESERVOIR 2001-2004

Fractures and faults are brittle structural heterogeneities that can act both as conduits and barriers with respect to fluid flow in rock. This range in the hydraulic effects of fractures and faults greatly complicates the challenges faced by geoscientists working on important problems: from groundwater aquifer and hydrocarbon reservoir management, to subsurface contaminant fate and transport, to underground nuclear waste isolation, to the subsurface sequestration of CO2 produced during fossil-… more

Date: February 22, 2005

Creator: Pollard, David & Aydin, Atilla

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Experimental Investigation and High Resolution Simulator of In-Situ Combustion Processes Quarterly Report

Accurate simulation of in-situ combustion processes is computationally very challenging because the spatial and temporal scales over which the combustion process takes place are very small. In this third quarterly report of our DoE funded research, we continue the discussion of the design of a new simulation tool based on an efficient Cartesian Adaptive Mesh Refinement technique that allows much higher grid densities to be used near typical fronts than current simulators. Also, we show prelimin… more

Date: July 1, 2004

Creator: Gerritsen, Margot & Kovscek, Anthony R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs Quarterly Report

This report outlines progress in the second quarter of the third year of the DOE project ''High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs''. This report presents results of an investigation of the effects of variation in interfacial tension (IFT) on three-phase relative permeability. We report experimental results that demonstrate the effect of low IFT between two of three phases on the three-phase relative permeabilities. In order to create three-p… more

Date: March 31, 2003

Creator: Franklin M. Orr, Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Eleventh workshop on geothermal reservoir engineering: Proceedings

The Eleventh Workshop on Geothermal Reservoir Engineering was held at Stanford University on January 21-23, 1986. The attendance was up compared to previous years, with 144 registered participants. Ten foreign countries were represented: Canada, England, France, Iceland, Indonesia, Italy, Japan, Mexico, New Zealand and Turkey. There were 38 technical presentations at the Workshop which are published as papers in this Proceedings volume. Six technical papers not presented at the Workshop are als… more

Date: January 23, 1986

Creator: Ramey, H.J. Jr.; Kruger, P.; Miller, F.G.; Horne, R.N.; Brigham, W.E. & Counsil, J.R. (Stanford Geothermal Program)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SEISMIC AND ROCK PHYSICS DIAGNOSTICS OF MULTISCALE RESERVOIR TEXTURES

As part of our study on ''Relationships between seismic properties and rock microstructure'', we have studied (1) Effects of pore texture on porosity, permeability, and sonic velocity. We show how a relation can be found between porosity, permeability, and velocity by separating the formations of rocks with similar pore textures.

Date: June 30, 2003

Creator: Mavko, Gary

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Use of Radar Methods to Determine Moisture Content in the Vadose Zone

Moisture content is a critical parameter affecting both liquid-phase and vapor-phase contaminant transport in the vadose zone. The objective of our three-year research project is to determine the optimal way to use of radar methods--both surface and borehole--as a noninvasive means of determining in situ moisture content. In our research we focus on two specific aspects of the link between radar images and moisture content. The first question we address is: Can we use a measure of the dielectri… more

Date: June 1, 2001

Creator: Knight, Rosemary

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Use of Radar Methods to Determine Moisture Content in the Vadose Zone

Date: June 1, 2002

Creator: Knight, Rosemary

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High Resolution Prediction of Gas Injection Process Performance for Heterogeneous Reservoirs Quarterly Report

This report presents a detailed analysis of the development of miscibility during gas cycling in condensates and the formation of condensate banks at the leading edge of the displacement front. Dispersion-free, semi-analytical one-dimensional (1D) calculations are presented for enhanced condensate recovery by gas injection. The semi-analytical approach allows investigation of the possible formation of condensate banks (often at saturations that exceed the residual liquid saturation) and also al… more

Date: June 30, 2003

Creator: Orr, Franklin M., Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Twentieth workshop on geothermal reservoir engineering: Proceedings

PREFACE The Twentieth Workshop on Geothermal Reservoir Engineering, dedicated to the memory of Professor Hank Ramey, was held at Stanford University on January 24-26, 1995. There were ninety-five registered participants. Participants came from six foreign countries: Japan, Mexico, England, Italy, New Zealand and Iceland. The performance of many geothermal reservoirs outside the United States was described in several of the papers. Professor Roland N. Horne opened the meeting and welcomed visito… more

Date: January 26, 1995

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Scaling of bubble growth in a porous medium. Topical report

Processes involving liquid-to-gas phase change in porous media are routinely encountered, for example in the recovery of oil, geothermal processes, nuclear waste disposal or enhanced heat transfer. They involve diffusion (and convection) in the pore space, driven by an imposed supersaturation in pressure or temperature. Phase change proceeds by nucleation and phase growth. Depending on pore surface roughness, a number of nucleation centers exist, thus phase growth occurs from a multitude of clu… more

Date: July 1, 1995

Creator: Satik, C.; Yortsos, Y. & Li, X.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Flow and displacement of Bingham plastics in porous media. Topical report

Bingham plastics, which exhibit a finite yield stress at zero shear rate, have been used to model the flow behavior of certain heavy oils at reservoir conditions. In such fluids, the onset of flow and displacement occurs only after the applied pressure gradient exceeds a minimum value. Understanding the flow behavior of such fluids has been limited to phenomenological approaches. In this paper, we present numerical simulations and experimental visualization of flow and immiscible displacement o… more

Date: July 1, 1995

Creator: Shah, C.; Kharabaf, H. & Yortsos, Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department