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DOE/FETC Gasis Project

Description: Technical progress on the GAS IS project during the quarter for contract no. DE-AC21 -93 MC281 39 is described. During this period, work was performed on Task 4 Technology Transfer, Task 7: Software Enhancement, Task 8: Reservoir Data System Updates, and Task 9: Supplemental Reservoir Studies.
Date: November 12, 1998
Creator: Hugman, R. H.
Partner: UNT Libraries Government Documents Department

Water injection as a means for reducing non-condensible andcorrosive gases in steam produced from vapor-dominated reservoirs

Description: Large-scale water injection at The Geysers, California, hasgenerated substantial benefits in terms of sustaining reservoir pressuresand production rates, as well as improving steam composition by reducingthe content of non-condensible gases (NCGs). Two effects have beenrecognized and discussed in the literature as contributing to improvedsteam composition, (1) boiling of injectate provides a source of "clean"steam to production wells, and (2) pressurization effects induced byboiling of injected water reduce upflow of native steam with large NCGconcentrations from depth. In this paper we focus on a possibleadditional effect that could reduce NCGs in produced steam by dissolutionin a condensed aqueous phase.Boiling of injectate causes pressurizationeffects that will fairly rapidly migrate outward, away from the injectionpoint. Pressure increases will cause an increase in the saturation ofcondensed phase due to vapor adsorption on mineral surfaces, andcapillary condensation in small pores. NCGs will dissolve in theadditional condensed phase which, depending upon their solubility, mayreduce NCG concentrations in residual steam.We have analyzed thepartitioning of HCl between vapor and aqueous phases, and have performednumerical simulations of injection into superheated vapor zones. Oursimulations provide evidence that dissolution in the condensed phase canindeed reduce NCG concentrations in produced steam.
Date: January 8, 2007
Creator: Pruess, Karsten; Spycher, Nicolas & Kneafsey, Timothy J.
Partner: UNT Libraries Government Documents Department

High Temperature ESP Monitoring

Description: The objective of the High Temperature ESP Monitoring project was to develop a downhole monitoring system to be used in wells with bottom hole well temperatures up to 300°C for measuring motor temperature, formation pressure, and formation temperature. These measurements are used to monitor the health of the ESP motor, to track the downhole operating conditions, and to optimize the pump operation. A 220 ºC based High Temperature ESP Monitoring system was commercially released for sale with Schlumberger ESP motors April of 2011 and a 250 ºC system with will be commercially released at the end of Q2 2011. The measurement system is now fully qualified, except for the sensor, at 300 °C.
Date: June 20, 2011
Creator: Booker, Jack & Dhruva, Brindesh
Partner: UNT Libraries Government Documents Department

Fault Geomechanics and Carbon Dioxide Leakage Applied to Geological Storage: FY07 Quarterly and Summary Reports

Description: Safe and permanent storage of carbon dioxide in geologic reservoirs is critical to geologic sequestration. The objective of this study is to quantify the conditions under which a general (simulated) fault network and a specific (field case) fault network will fail and leak carbon dioxide out of a reservoir. Faults present a potential fast-path for CO{sub 2} leakage from reservoirs to the surface. They also represent potential induced seismicity hazards. It is important to have improved quantitative understandings of the processes that trigger activity on faults and the risks they present. Fortunately, the conditions under which leakage along faults is induced can be predicted and quantified given the fault geometry, reservoir pressure, an in-situ stress tensor. We proposed to expand the current capabilities of fault threshold characterization and apply that capability to a site where is CO{sub 2} injection is active or planned. Specifically, we proposed to use a combination of discrete/explicit and continuum/implicit codes to provide constrain the conditions of fault failure. After minor enhancements of LLNL's existing codes (e.g., LDEC), we would create a 3D synthetic model of a common configuration (e.g., a faulted dome). During these steps, we will identify a field site where the necessary information is available and where the operators are willing to share the necessary information. We would then execute an analysis specific to the field case. The primary products by quarter are: 1Q--Identification of likely field case; 2Q--Functioning prototype fault model; 3Q--Execution of fault-slip/migration calculation for synthetic case; and 4Q--Begin simulation of fault-slip/migration calculation for field system. It is worth noting that due to the continuing resolution, we did not receive any funds until 3Q, and did not receive >65% of the support until 4Q. That said, we were still able to meet all of our milestones for FY07 on time and ...
Date: November 2, 2007
Creator: Friedmann, S. J. & Morris, J.
Partner: UNT Libraries Government Documents Department

Shear-slip analysis in multiphase fluid-flow reservoir engineeringap plications using TOUGH-FLAC

Description: This paper describes and demonstrates the use of the coupledTOUGH-FLAC simulator for geomechanical shear-slip (failure) analysis inmultiphase fluid-flow reservoir-engineering applications. Two approachesfor analyzing shear-slip are described, one using continuum stress-strainanalysis and another using discrete fault analysis. The use of shear-slipanalysis in TOUGH-FLAC is demonstrated on application examples related toCO2 sequestration and geothermal energy extraction. In the case of CO2sequestration, the shear-slip analysis is used to evaluate maximumsustainable CO2-injection pressure under increasing reservoir pressure,whereas in the case of geothermal energy extraction, the shear-slipanalysis is used to study induced seismicity during steam productionunder decreasing reservoir pressure and temperature.
Date: January 15, 2006
Creator: Rutqvist, Jonny; Birkholzer, Jens; Cappa, Frederic; Oldenburg,Curt & Tsang, Chin-Fu
Partner: UNT Libraries Government Documents Department

Analytical solution for Joule-Thomson cooling during CO2 geo-sequestration in depleted oil and gas reservoirs

Description: Mathematical tools are needed to screen out sites where Joule-Thomson cooling is a prohibitive factor for CO{sub 2} geo-sequestration and to design approaches to mitigate the effect. In this paper, a simple analytical solution is developed by invoking steady-state flow and constant thermophysical properties. The analytical solution allows fast evaluation of spatiotemporal temperature fields, resulting from constant-rate CO{sub 2} injection. The applicability of the analytical solution is demonstrated by comparison with non-isothermal simulation results from the reservoir simulator TOUGH2. Analysis confirms that for an injection rate of 3 kg s{sup -1} (0.1 MT yr{sup -1}) into moderately warm (>40 C) and permeable formations (>10{sup -14} m{sup 2} (10 mD)), JTC is unlikely to be a problem for initial reservoir pressures as low as 2 MPa (290 psi).
Date: May 21, 2010
Creator: Mathias, S.A.; Gluyas, J.G.; Oldenburg, C.M. & Tsang, C.-F.
Partner: UNT Libraries Government Documents Department

RIVERTON DOME GAS EXPLORATION AND STIMULATION TECHNOLOGY DEMONSTRATION, WIND RIVER BASIN, WYOMING

Description: A primary objective of the Institute for Energy Research (IER)-Santa Fe Snyder Corporation DOE Riverton Dome project is to test the validity of a new conceptual model and resultant exploration paradigm for so-called ''basin center'' gas accumulations. This paradigm and derivative exploration strategy suggest that the two most important elements crucial to the development of prospects in the deep, gas-saturated portions of Rocky Mountain Laramide Basins (RMLB) are (1) the determination and, if possible, three-dimensional evaluation of the pressure boundary between normal and anomalous pressure regimes (i.e., this boundary is typically expressed as a significant inversion in both sonic and seismic velocity-depth profiles) , and (2) the detection and delineation of porosity/permeability ''sweet spots'' (i.e., areas of enhanced storage capacity and deliverability) in potential reservoir targets below this boundary. There are other critical aspects in searching for basin center gas accumulations, but completion of these two tasks is essential to the successful exploration for the unconventional gas resources present in anomalously pressured rock/fluid systems in the Rocky Mountain Laramide Basins. The southern Wind River Basin, in particular the Riverton Dome and Emigrant areas, is a neat location for testing this exploration paradigm. Preliminary work within the Wind River Basin has demonstrated that there is a regionally prominent pressure surface boundary that can be detected by inversions in sonic velocity depth gradients in individual well log profiles and that can be seen as a velocity inversion on seismic lines. Also, the Wind River Basin in general--and the Riverton Dome area specially--is characterized by a significant number of anomalously pressured gas accumulations. Most importantly, Santa Fe Snyder Corporation has provided the study with sonic logs, two 3-D seismic studies (40 mi{sup 2} and 30 mi {sup 2}) and a variety of other necessary geological and geophysical information.
Date: August 1, 1999
Creator: Surdam, Dr. Ronald C.
Partner: UNT Libraries Government Documents Department

Experimental Support for a Predictive Osmotic Model of Clay Membranes

Description: Osmosis has been cited as a mechanism for explaining anomalously high fluid pressures in the subsurface. Clays and shales act as membranes, and osmotic flux across these units may result in pressures sufficiently high to explain these anomalies. The theoretical osmotic pressures as calculated solely from solution properties can be quite large; however, it is not yet resolved whether these geologic membranes are sufficiently ideal to generate such pressures.
Date: August 29, 2001
Creator: Fritz, S.J.
Partner: UNT Libraries Government Documents Department

Increasing Heavy Oil Reserves in the Wilmington Oil Field through Advanced Reservoir Characterization and Thermal Production Technologies

Description: The objective of this project is to increase the recoverable heavy oil reserves within sections of the Wilmington Oil Field, near Long Beach, California. This is realized through the testing and application of advanced reservoir characterization and thermal production technologies. It is hoped that the successful application of these technologies will result in their implementation throughout the Wilmington Field and through technology transfer, will be extended to increase the recoverable oil reserves in other slope and basin clastic (SBC) reservoirs. The existing steamflood in the Tar zone of Fault Block (FB) II-A has been relatively insufficient because of several producability problems which are common in SBC reservoir; inadequate characterization of the heterogeneous turbidite sands, high permeability thief zones, low gravity oil and non-uniform distribution of the remaining oil. This has resulted in poor sweep efficiency, high steam-oil ratios, and early breakthrough. Operational problems related to steam breakthrough, high reservoir pressure, and unconsolidated sands have caused premature well and downhole equipment failures. In aggregate, these reservoir and operational constraints have resulted in increased operating costs and decreased recoverable reserves.
Date: June 25, 1999
Creator: Beach, City of Long; Associates, David K.Davies and; Company, Tidelands Oil Production & California, University of Southern
Partner: UNT Libraries Government Documents Department

Hyperfiltration-induced fractionation of lithium isotopes in geologic systems. Progress report, April 1, 1992--June 30, 1993

Description: The purpose of this research was to show whether hyperfiltration is an efficient mechanism to fractionate lithium isotopes. This paper reports results of experiments in which freeze-dried, LiCl-saturated bentonite is sedimented onto a chemically inert filter paper fitted to a porous plug. The filter is connected to a syringe pump capable of delivering solution at a precisely controlled flow rate. Deionized water is forced through the membrane to determine its hydraulic conductivity. The deionized water is then changed to 9.411 mN LiCl solution. The {sup 7}Li/{sup 6}Li ratio is measured for the input solution as well as the effluent. The concentration profile for {sup 6}Li and {sup 7}Li can then be computed. These experiments have shown lithium isotope fractionation by hyperfiltration through geologic materials.
Date: June 1, 1993
Creator: Fritz, S. J.
Partner: UNT Libraries Government Documents Department

CO2 gas/oil ratio prediction in a multi-component reservoir bycombined seismic and electromagnetic imaging

Description: Crosswell seismic and electromagnetic data sets taken before and during CO2 flooding of an oil reservoir are inverted to produce crosswell images of the change in compressional velocity, shear velocity and electrical conductivity during a CO2 injection pilot study. A rock properties model is developed using measured log porosity, fluid saturations, pressure, temperature, bulk density, sonic velocity and electrical conductivity. The parameters of the rock properties model are found by an L1-norm simplex minimization of predicted and observed compressional velocity and density. A separate minimization using Archie's law provides parameters for modeling the relations between water saturation, porosity and the electrical conductivity. The rock properties model is used to generate relationships between changes in geophysical parameters and changes in reservoir parameters. The electrical conductivity changes are directly mapped to changes in water saturation. The estimated changes in water saturation are used with the observed changes in shear wave velocity to predict changes in reservoir pressure. The estimation of the spatial extent and amount of CO2 relies on first removing the effects of the water saturation and pressure changes from the observed compressional velocity changes, producing a residual compressional velocity change. The residual compressional velocity change is then interpreted in terms of increases in the CO2 /oil ratio. Resulting images of CO2/oil ratio show CO2 rich zones that are well correlated with the location of injection perforations with the size of these zones also correlating to the amount of injected CO2. The images produced by this process are better correlated to the location and amount of injected CO2 than are any of the individual images of change in geophysical parameters.
Date: August 28, 2002
Creator: Hoversten, G.M.; Gritto, Roland; Washbourne, John & Daley, Tom
Partner: UNT Libraries Government Documents Department

Use of Cutting-Edge Horizontal and Underbalanced Drilling Technologies and Subsurface Seismic Techniques to Explore, Drill and Produce Reservoired Oil and Gas from the Fractured Monterey Below 10,000 ft in the Santa Maria Basin of California

Description: This project was undertaken to demonstrate that oil and gas can be drilled and produced safely and economically from a fractured Monterey reservoir in the Santa Maria Basin of California by employing horizontal wellbores and underbalanced drilling technologies. Two vertical wells were previously drilled in this area with heavy mud and conventional completions; neither was commercially productive. A new well was drilled by the project team in 2004 with the objective of accessing an extended length of oil-bearing, high-resistivity Monterey shale via a horizontal wellbore, while implementing managed-pressure drilling (MPD) techniques to avoid formation damage. Initial project meetings were conducted in October 2003. The team confirmed that the demonstration well would be completed open-hole to minimize productivity impairment. Following an overview of the geologic setting and local field experience, critical aspects of the application were identified. At the pre-spud meeting in January 2004, the final well design was confirmed and the well programming/service company requirements assigned. Various design elements were reduced in scope due to significant budgetary constraints. Major alterations to the original plan included: (1) a VSP seismic survey was delayed to a later phase; (2) a new (larger) surface hole would be drilled rather than re-enter an existing well; (3) a 7-in. liner would be placed into the top of the Monterey target as quickly as possible to avoid problems with hole stability; (4) evaluation activities were reduced in scope; (5) geosteering observations for fracture access would be deduced from penetration rate, cuttings description and hydrocarbon in-flow; and (6) rather than use nitrogen, a novel air-injection MPD system was to be implemented. Drilling operations, delayed from the original schedule by capital constraints and lack of rig availability, were conducted from September 12 to November 11, 2004. The vertical and upper curved sections were drilled and lined through the ...
Date: June 30, 2006
Creator: Witter, George; Knoll, Robert; Rehm, William & Williams, Thomas
Partner: UNT Libraries Government Documents Department

Vapour generation in hot permeable rock through injection of water

Description: We present a non-linear model to describe vapor generation in a hot, permeable rock through injection of water. We develop similarity solutions describing the steady injection of fluid from a line source. A systematic parameter study has shown that, with other parameters fixed, as (1) the reservoir pressure increases, the mass fraction vaporized decreases; (2) the reservoir temperature increases, the mass fraction vaporized increases; (3) as the mass injection rate increases, the mass fraction vaporized decreases; and (4) as the porosity increases, the mass fraction vaporized decreases. We then present similarity solutions which describe injection from (1) a point source, with the mass flux injected proportional to t{sup 1/2}; and (2) a planar source, with the mass flux injected proportional to t{sup -1/2}, where t is the time of injection. These results suggest that for steady injection, the vapor production gradually increases for injection from a point source, and gradually decreases for planar injection. We confirm this prediction with numerical calculations describing the vapor production resulting from steady injection from line, point and planar sources.
Date: January 1, 1992
Creator: Fitzgerald, Shaun D. & Woods, Andrew W.
Partner: UNT Libraries Government Documents Department

THE THERMAL 15 RELIEF WELL AND PRODUCTION PERFORMANCE OF THE THERMAL SHALLOW RESERVOIR

Description: Thermal 15 was drilled in November, 1983, to a TD of 700 feet. A steam entry encountered at 490 feet was found to communicate with the high-permeability upflow zone of the Thermal Shallow Reservoir. A low-flow-rate, higher-pressure steam entry at 600 feet was not detected while drilling but was indicated during a subsequent spinner survey. The pressure, flowrate, and enthalpy of the five wells completed in the upflow zone, including the Thermal 4 blowout, were monitored and recorded over a four month period before, during and after Thermal 15 was drilled. It was found that the Thermal 4 blowout communicates with the upflow zone of the Thermal Shallow Reservoir, the Thermal 4 flowrate is controlled by the shallow reservoir pressure, and the high permeability of the upflow zone allows such strong interference effects that three of the four commercial production wells will maximize production from this reservoir. A simple model was developed which describes the pressure-production characteristics of the reservoir over the normal range of operating conditions.
Date: January 22, 1985
Creator: Mogen, P. & Maney, J.
Partner: UNT Libraries Government Documents Department

Development and Application of Insulated Drill Pipe for High Temperature, High Pressure Drilling

Description: This project aimed to extend the insulated drill pipe (IDP) technology already demonstrated for geothermal drilling to HTHP drilling in deep gas reservoirs where temperatures are high enough to pose a threat to downhole equipment such as motors and electronics. The major components of the project were: a preliminary design; a market survey to assess industry needs and performance criteria; mechanical testing to verify strength and durability of IDP; and development of an inspection plan that would quantify the ability of various inspection techniques to detect flaws in assembled IDP. This report is a detailed description of those activities.
Date: December 31, 2008
Creator: Champness, Tom; Worthen, Tony & Finger, John
Partner: UNT Libraries Government Documents Department

Report on flow tests Tuscarora, Nevada, 66-5, April 22, 1980, lithologic well and temperature depth data

Description: Enthalpy Inc., of Santa Rose, California, was engaged by Amax Exploration Inc., of Denver, Colorado in April of 1980 to conduct flow tests on a geothermal prospect in Northern Nevada. The well site, Tuscarora 66-5, is located approximately 11 miles northeast of the town of Tuscarora within Independence Valley, Elko County, Nevada. The testing program was set up by Enthalpy Inc. and run by D. Ensrud of Enthalpy Inc. The initial tests included measuring temperature, pressure, total dissolved solids (T.D.S.) and pH of the fluid produced. These parameters were used to examine the well's mass flow and deliverability. The tests were terminated at 7:00 p.m. April 22, 1980 because of low temperatures. Subsurface surveys (pressure temperature) were run on April 21st and again on April 23rd.
Date: July 1, 1980
Partner: UNT Libraries Government Documents Department

Gulf Petro Initiative

Description: In this report, technologies for petroleum production and exploration enhancement in deepwater and mature fields are developed through basic and applied research by: (1) Designing new fluids to efficiently drill deepwater wells that can not be cost-effectively drilled with current technologies. The new fluids will be heavy liquid foams that have low-density at shallow dept to avoid formation breakdown and high density at drilling depth to control formation pressure. The goal of this project is to provide industry with formulations of new fluids for reducing casing programs and thus well construction cost in deepwater development. (2) Studying the effects of flue gas/CO{sub 2} huff n puff on incremental oil recovery in Louisiana oilfields bearing light oil. An artificial neural network (ANN) model will be developed and used to map recovery efficiencies for candidate reservoirs in Louisiana. (3) Arriving at a quantitative understanding for the three-dimensional controlled-source electromagnetic (CSEM) geophysical response of typical Gulf of Mexico hydrocarbon reservoirs. We will seek to make available tools for the qualitative, rapid interpretation of marine CSEM signatures, and tools for efficient, three-dimensional subsurface conductivity modeling.
Date: February 5, 2011
Creator: Boukadi, Fathi
Partner: UNT Libraries Government Documents Department

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

Description: 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 others. Using 3D digital images of the pore space as input data, the method of maximal inscribed spheres (MIS) predicts two-phase fluid distribution in capillary equilibrium. Verification against the tomography images shows a good agreement between the computed fluid distribution in the pores and the experimental data. The model-predicted capillary pressure curves and tomography-based porosimetry distributions compared favorably with the mercury injection data. Thus, micro CT in combination with modeling based on the MIS is a viable approach to study the pore-scale mechanisms of CO{sub 2} injection into an aquifer, as well as more general multi-phase flows.
Date: October 19, 2010
Creator: Silin, D.; Tomutsa, L.; Benson, S. & Patzek, T.
Partner: UNT Libraries Government Documents Department

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

Description: 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-plate approximation for suitably small subregions in the fracture plane. For log-normal aperture distributions, a simple approximation to fracture capillary pressure is obtained in closed form; it is found to resemble the typical shape of Leverett's j-function. Wetting and non-wetting phase relative permeabilities are calculated by numerically simulating single phase flows separately in the wetted and non-wetted pore spaces. Illustrative examples indicate that relative permeabilities depend sensitively on the nature and range of spatial correlation between apertures. It is also observed that interference between fluid phases flowing in a fracture tends to be strong, with the sum of wetting and nonwetting phase relative permeabilities being considerably less than 1 at intermediate saturations.
Date: September 1989
Creator: Pruess, K. & Tsang, Y. W.
Partner: UNT Libraries Government Documents Department

Experimental Investigation of Relative Permeability Upscaling from the Micro-Scale to the Macro-Scale

Description: During this reporting period, achieved the milestone of using Optical Coherence Imaging (OCI) to image to the back of the first layer of grains in a sandstone sample. This was the first time that OCI was used to image through sandstone. Information on grain geometry was obtained as deep as 400 microns into the sample. This report also describes the work performed to achieve the milestone on the measurement of interfacial area per volume, capillary pressure and saturation in two dimensional micromodels structures that are statistically similar to real porous media. This report contains the first quantitative experimental measurements of interfacial area per volume in any system.
Date: March 1, 2001
Creator: Yu, Ping; Giodao, Nicholas; Cheng, JiangTao; Mustata, Mirela; Headley, William; Chen, Diaquan et al.
Partner: UNT Libraries Government Documents Department

Models for naturally fractured, carbonate reservoir simulations

Description: This report outlines the need for new tools for the simulation of fractured carbonate reservoirs. Several problems are identified that call for the development of new reservoir simulation physical models and numerical techniques. These include: karst and vuggy media wherein Darcy`s and traditional multi-phase flow laws do not apply; the need for predicting the preproduction state of fracturing and stress so that the later response of effective stress-dependent reservoirs can be predicted; and methods for predicting the fracturing and collapse of vuggy and karst reservoirs in response to draw-down pressure created during production. Specific research directions for addressing each problem are outlined and preliminary results are noted.
Date: December 31, 1998
Creator: Tuncay, K.; Park, A.; Ozkan, G.; Zhan, X.; Ortoleva, P.; Hoak, T. et al.
Partner: UNT Libraries Government Documents Department

West Hackberry tertiary project. Summary annual report, September 3, 1996--September 2, 1997

Description: The goal of the West Hackberry Tertiary Project is to demonstrate the technical and economic feasibility of combining air injection with the Double Displacement Process for tertiary oil recovery. The Double Displacement Process is the gas displacement of a water invaded oil column for the purpose of recovering oil through gravity drainage. The novel aspect of this project is the use of air as the injection fluid. The target reservoirs for the project are in the Oligocene Age sands located on the west and north flanks of West hackberry Field in Cameron Parish, Louisiana. If successful, this project will demonstrate that the use of air injection in the Double Displacement Process can economically recover oil in reservoirs where tertiary oil recovery is presently uneconomic. By the end of the fourth year of Budget period 1, air injection has been under way at West Hackberry since November of 1994 on the west flank and since July of 1996 on the north flank. During the past year, the most noteworthy events were: (1) increased oil production in low pressure reservoirs on the north flank, (2) demonstrated economic viability of air injection in low pressure reservoirs, (3) increased west flank reservoir pressure as a result of air injection and (4) intensified program of technology transfer activities. This report includes a discussion of the areas of progress.
Date: September 21, 1997
Creator: Gillham, T.H.
Partner: UNT Libraries Government Documents Department

[Mass and energy transport in the earth`s crust: Hydrodynamics of sedimentary basins]. Annual report, 1994

Description: The objective of this study is to investigate the cause(s) of abnormally high pore fluid pressures in the Uinta Basin, Utah. The Altamont-Bluebell oil-field, in the deepest part of the Uinta Basin, has pore pressure that in some places exceeds 0.8 of lithostatic. There are two prevailing explanations for the high pore pressure: (1) sedimentary loading and (2) the volume expansion and collapse of porosity associated with the conversion of solid kerogen to liquid oil. The purpose of this research is to test these hypotheses of pressure generation using three-dimensional, multiphase numerical simulation. These simulations will allow the authors to further investigate the migration of oil within the Uinta Basin.
Date: December 31, 1994
Partner: UNT Libraries Government Documents Department

Application of advanced reservoir characterization, simulation, and production optimization strategies to maximize recovery in slope and basin clastic reservoirs, West Texas (Delaware Basin), Class III

Description: The objective of this Class 3 project was to demonstrate that detailed reservoir characterization of slope and basin clastic reservoirs in sandstones of the Delaware Mountain Group in the Delaware Basin of West Texas and New Mexico is a cost effective way to recover a higher percentage of the original oil in place through strategic placement of infill wells and geologically based field development. Phase 1 of the project, reservoir characterization, was completed this year, and Phase 2 began. The project is focused on East Ford field, a representative Delaware Mountain Group field that produces from the upper Bell Canyon Formation (Ramsey sandstone). The field, discovered in 1960, is operated by Oral Petco, Inc., as the East Ford unit. A CO{sub 2} flood is being conducted in the unit, and this flood is the Phase 2 demonstration for the project.
Date: May 24, 2000
Creator: Dutton, Shirley P.; Flanders, William A. & Zirczy, Helena H.
Partner: UNT Libraries Government Documents Department