918 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "Reservoir Rock"

open access

On Two-Phase Relative Permeability and Capillary Pressure ofRough-Walled Rock Fractures

This paper presents a conceptual and numerical model of multiphase flow in fractures. The void space of real rough-walled rock fractures is conceptualized as a two-dimensional heterogeneous porous medium, characterized by aperture as a function of position in the fracture plane. Portions of a fracture are occupied by wetting and nonwetting phase, respectively, according to local capillary pressure and accessibility criteria. Phase occupancy and permeability are derived by assuming a parallel-pl… more

Date: September 1989

Creator: Pruess, K. & Tsang, Y. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Multidisciplinary Imaging of Rock Properties in Carbonate Reservoirs for Flow-Unit Targeting

Excellent progress continues to be made on most objectives and goals. Primary focus during the past 6 months has been (1) simulation of reservoir performance using the reservoir model constructed for the Phase 1 study area, (2) extension of core and log characterization activities to the Phase 2 study area, (3) development of an initial velocity-based inversion model from the 3-D seismic volume for porosity characterization, (4) continuation of quality-control analysis of wireline logs. Prelimi… more

Date: July 1, 2003

Creator: Ruppel, Stephen C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Exploitation and Optimization of Reservoir Performance in Hunton Formation, Oklahoma

West Carney field--one of the newest fields discovered in Oklahoma--exhibits many unique production characteristics. These characteristics include: (1) decreasing water-oil ratio; (2) decreasing gas-oil ratio followed by an increase; (3) poor prediction capability of the reserves based on the log data; and (4) low geological connectivity but high hydrodynamic connectivity. The purpose of this investigation is to understand the principal mechanisms affecting the production, and propose methods b… more

Date: January 1, 2006

Creator: Kelkar, Mohan

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Seismic Absorption and Modulus Measurements in Porous Rocks Under Fluid and Gas Flow-Physical and Chemical Effects: a Laboratory Study

This paper describes the culmination of a research project in which we investigated the complex modulus change in partially fluid saturated porous rocks. The investigation started with simple flow experiments over ''clean'' and ''contaminated'' surfaces, progressed to moduli measurements on partially filled single cracks, to measurements in ''clean'' and ''contaminated'' porous rocks and finally to a feasibility study in the field. For the experiments with the simple geometries we were able to … more

Date: November 28, 2005

Creator: Spetzler, Harmut

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Application of artifical intelligence to reservoir characterization: An interdisciplinary approach. Annual report, October 1993--October 1994

This basis of this research is to apply novel techniques from Artificial Intelligence and Expert Systems in capturing, integrating and articulating key knowledge from geology, geostatistics, and petroleum engineering to develop accurate descriptions of petroleum reservoirs. The ultimate goal is to design and implement a single powerful expert system for use by small producers and independents to efficiently exploit reservoirs.

Date: July 1, 1995

Creator: Kelkar, B. G.; Gamble, R. F.; Kerr, D. R.; Thompson, L. G. & Shenoi, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Improving CO2 Efficiency for Recovering Oil in Heterogeneous Reservoirs

A three-year contract for the project, DOE Contract No. DE-FG26-01BC15364, ''Improving CO{sub 2} Efficiency for Recovering Oil in Heterogeneous Reservoirs'', was started on September 28, 2001. This project examines three major areas in which CO{sub 2} flooding can be improved: fluid and matrix interactions, conformance control/sweep efficiency, and reservoir simulation for improved oil recovery. The project has received a one-year, no-cost extension to September 27, 2005. During this extra time… more

Date: March 27, 2004

Creator: Grigg, Reid B.; Svec, Robert K.; Zeng, Zheng-Wen; Yi, Liu & Bai, Baojun

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evaluation of methods for measuring relative permeability of anhydride from the Salado Formation: Sensitivity analysis and data reduction

This report documents, demonstrates, evaluates, and provides theoretical justification for methods used to convert experimental data into relative permeability relationships. The report facilities accurate determination of relative permeabilities of anhydride rock samples from the Salado Formation at the Waste Isolation Pilot Plant (WIPP). Relative permeability characteristic curves are necessary for WIPP Performance Assessment (PA) predictions of the potential for flow of waste-generated gas f… more

Date: May 1, 1997

Creator: Christiansen, R.L.; Kalbus, J.S. & Howarth, S.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Modeling brine inflow to Room Q: A numerical investigation of flow mechanisms

A hydrologic modeling study was performed to gain insight into the flow mechanisms around Room Q. A summary of hydrologic and structural data and of predictive fluid flow models from Room Q are provided. Six years of measured data are available from the time of excavation. No brine accumulation in Room Q was measured in the first two years following excavation. However, there is considerable uncertainty associated with this early-time data due to inadequate sealing of the room. Brine may have b… more

Date: April 1, 1997

Creator: Freeze, G. A.; Christian-Frear, T. L. & Webb, S. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Interdisciplinary study of reservoir compartments and heterogeneity. Final report, October 1, 1993--December 31, 1996

A case study approach using Terry Sandstone production from the Hambert-Aristocrat Field, Weld County, Colorado was used to document the process of integration. One specific project goal is to demonstrate how a multidisciplinary approach can be used to detect reservoir compartmentalization and improve reserve estimates. The final project goal is to derive a general strategy for integration for independent operators. Teamwork is the norm for the petroleum industry where teams of geologists, geop… more

Date: January 1998

Creator: Van Kirk, Craig

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Application of reservoir characterization and advanced technology to improve recovery and economics to a low quality shallow shelf carbonate reservoir. Quarterly report, October 1, 1996--December 31, 1996

West Welch Unit is one of four large waterflood units in the Welch Field in the northwestern portion of Dawson County, Texas. The Welch Field was discovered in the early 1940`s and produces oil under a solution gas drive mechanism from the San Andres formation at approximately 4800 ft. The field has been under waterflood for 30 years and significant portion has been infill-drilled on 20-ac density. A 1982-86 pilot CO{sub 2} injection project in the offsetting South Welch Unit yielded positive r… more

Date: October 1, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Preliminary three-dimensional discrete fracture model, Tiva Canyon tuff, Yucca Mountain area, Nye County, Nevada

A three-dimensional discrete fracture model was completed to investigate the potential effects of fractures on the flow of water at Yucca Mountain, Nye County, Nevada. A fracture network of the Exploratory Studies Facility starter tunnel area was simulated and calibrated with field data. Two modeled volumes were used to simulate three-dimensional fracture networks of the Tiva Canyon tuff. One volume had a width and length of 150 meters, and the other had a width and length of 200 meters; both v… more

Date: September 1, 1998

Creator: Anna, L. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Methodology to Integrate Magnetic Resonance and Acoustic Measurements for Reservoir Characterization

The objective of this project was to develop an advanced imaging method, including pore scale imaging, to integrate NMR techniques and acoustic measurements to improve predictability of the pay zone in hydrocarbon reservoirs. This is accomplished by extracting the fluid property parameters using NMR laboratory measurements and the elastic parameters of the rock matrix from acoustic measurements to create poroelastic models of different parts of the reservoir. Laboratory measurement techniques a… more

Date: January 29, 2002

Creator: Parra, Jorge O.; Hackert, Chris L.; Collier, Hughbert A. & Bennett, Michael

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A model for predicting damage dependent response of inelastic media with microstructure

This paper presents a model developed for predicting the mechanical response of inelastic media with heterogeneous microstructure. Particular emphasis is given to the development of microstructural damage along grains. The model is developed within the concepts of continuum mechanics, with special emphasis on the development of internal boundaries in the continuum by utilizing fracture mechanics-based cohesive zone models. In addition, the grains are assumed to be characterized by nonlinear vis… more

Date: December 1, 1997

Creator: Allen, D.H.; DeVries, K.L. & Hurtado, L.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Micromechanics of Compaction in an Analogue Reservoir Sandstone

Energy production, deformation, and fluid transport in reservoirs are linked closely. Recent field, laboratory, and theoretical studies suggest that, under certain stress conditions, compaction of porous rocks may be accommodated by narrow zones of localized compressive deformation oriented perpendicular to the maximum compressive stress. Triaxial compression experiments were performed on Castlegate, an analogue reservoir sandstone, that included acoustic emission detection and location. Initia… more

Date: February 28, 2000

Creator: Digiovanni, Anthony A.; Fredrich, Joanne T.; Holcomb, David J. & Olsson, William A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Improved oil recovery in fluvial dominated deltaic reservoirs of Kansas - near - term. Technical progress report, June 17, 1994--June 17, 1995

Common oil field problems exist in fluvial dominated deltaic reservoirs in Kansas. The problems are poor waterflood sweep and lack of reservoir management. The poor waterflood sweep efficiency is due to (1) reservoir heterogeneity, (2) channeling of injected water through high permeability zones or fractures, and (3) clogging of water injection wells with solids as a result of poor water quality. In many instances the lack of reservoir management is due to lack of (1) data collection and organi… more

Date: July 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Influence of pore pressure and production-induced changes in pore pressure on in situ stress

Knowledge of in situ stress and how stress changes with reservoir depletion and pore pressure drawdown is important in a multi-disciplinary approach to reservoir characterization, reservoir management, and improved oil recovery projects. This report summarizes a compilation of in situ stress data from six fields showing the effects of pore pressure and production-induced changes in pore pressure on the minimum horizontal stress. The in situ stress data and corresponding pore pressure data were … more

Date: February 1, 1996

Creator: Teufel, L. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effects of stratal architecture and diagenesis on reservoir development in the Grayburg formation: SSouth Cowden field, Ector County, Texas. Annual report, 1 October 1994--30 September 1995

This report presents the results of geological characterization studies in a typical Grayburg reservior in the Permian Basin. The work applies geological models developed in outcrop studies to better constrain the geological reservoir framework and heterogeneity in a typical Grayburg reservoir, The South Cowden Grayburg reservoir. This framework provides a strong basis for defining petrophysical and flow unit properties in the reservior and serves as a prototype model for other Grayburg reservo… more

Date: February 1, 1996

Creator: Ruppel, S. & Bebout, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Increased oil recovery from mature oil fields using gelled polymer treatments

Gelled polymer treatments are applied to oil reservoirs to increase oil production to reduce water production by altering the fluid movement within the reservoir. This research program is aimed at reducing barriers to the widespread use of these treatments by developing methods to predict gel behavior during placement in matrix rock and fractures, determining the persistence of permeability reduction after gel placement, and by developing methods to design production well treatments to control … more

Date: February 23, 2000

Creator: Willhite, G. Paul; Green, Down W. & McCool, Stan

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Investigation of wellbore cooling by circulation and fluid penetration into the formation using a wellbore thermal simulator computer code

The high temperatures of geothermal wells present severe problems for drilling, logging, and developing these reservoirs. Cooling the wellbore is perhaps the most common method to solve these problems. However, it is usually not clear what may be the most effective wellbore cooling mechanism for a given well. In this paper, wellbore cooling by the use of circulation or by fluid injection into the surrounding rock is investigated using a wellbore thermal simulator computer code. Short circulatio… more

Date: January 1, 1985

Creator: Duda, L.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of thermally induced permeability enhancement in geothermal injection wells

Reinjection of spent geothermal brine is a common means of disposing of geothermal effluents and maintaining reservoir pressures. Contrary to the predictions of two-fluid models (two-viscosity) of nonisothermal injection, an increase of injectivity, with continued injection, is often observed. Injectivity enhancement and thermally-affected pressure transients are particularly apparent in short-term injection tests at the Los Azufres Geothermal Field, Mexico. During an injection test, it is not … more

Date: February 1, 1987

Creator: Benson, S. M.; Daggett, J. S.; Iglesias, E.; Arellano, V. & Ortiz-Ramirez, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigation of wettability by NMR microscopy and spin-lattice relaxation

The wettability of reservoir rock has an important impact on the efficiency of oil recovery processes and the distribution of oil and water within the reservoir. One of the potentially useful tools for wettability measurements is nuclear magnetic resonance (NMR) and spin-lattice relaxation. More recently using NMR microscopy NIPER has developed the capability of imaging one- and two-phase fluid systems in reservoir rock at resolutions to 25 microns. Effects seen in the images of fluids within t… more

Date: November 1, 1993

Creator: Doughty, D. A. & Tomutsa, Liviu

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Fundamentals of Reservoir Surface Energy as Related to Surface Properties, Wettability, Capillary Action, and Oil Recovery from Fractured Reservoirs by Spontaneous Imbibition

The objective of this project is to increase oil recovery from fractured reservoirs through improved fundamental understanding of the process of spontaneous imbibition by which oil is displaced from the rock matrix into the fractures. Spontaneous imbibition is fundamentally dependent on the reservoir surface free energy but this has never been investigated for rocks. In this project, the surface free energy of rocks will be determined by using liquids that can be solidified within the rock pore… more

Date: June 30, 2008

Creator: Morrow, Norman; Fischer, Herbert; Li, Yu; Mason, Geoffrey; Ruth, Douglas; Seth, Siddhartha et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Microtomography and pore-scale modeling of two-phase Fluid Distribution

Synchrotron-based X-ray microtomography (micro CT) at the Advanced Light Source (ALS) line 8.3.2 at the Lawrence Berkeley National Laboratory produces three-dimensional micron-scale-resolution digital images of the pore space of the reservoir rock along with the spacial distribution of the fluids. Pore-scale visualization of carbon dioxide flooding experiments performed at a reservoir pressure demonstrates that the injected gas fills some pores and pore clusters, and entirely bypasses the other… more

Date: October 19, 2010

Creator: Silin, D.; Tomutsa, L.; Benson, S. & Patzek, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Model for Residual Saturations and Capillary Imbibition and Drainage Pressures

A pore saturation model expresses the capillary pressure as a function of a characteristic pore pressure and the wetting phase saturation. Singularity analyses of the total energies of the wetting and nonwetting phases give the residual saturations for the two phases. The total energy consists of a potential term and a work term associated with the effective pressure gradient for each phase. The derived residual wetting saturation is 0.236, and the derived residual nonwetting saturation is 0.88… more

Date: April 1, 2004

Creator: LAURINAT, JAMESE

Item Type: Article

Partner: UNT Libraries Government Documents Department