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Improvement of CO sub 2 flood performance
This is the final report of a six-year research project devoted to the study of processes of oil displacement using dense carbon dioxide. The topics studied have included phase behavior and physical properties of mixtures of crude oil with CO{sub 2}, the phenomena involved in the displacement of oil through reservoir rock under oilfield conditions, the influence of stabilized lamella or CO{sub 2}-foam on this displacement and the development of computer programs to simulate the displacement. In addition, the occurrence of nonuniformities in the displacement pattern has also been considered. The effect on displacement of permeability heterogeneities in the reservoir have been studied geostatistically and by direct numerical modelling. Displacement nonuniformities that are induced by viscosity and density differences between displaced and displacing fluids have also been considered, and efforts are described for the development of two different types of additive for purposes of mobility control of CO{sub 2} floods. One of these is the so-called CO{sub 2}-foam, formed by simultaneous flow through the formation of dense CO{sub 2} with a water solution of a special surfactant. The second type under development in the project is known as direct thickener, and consists of a polymer that is soluble in dense …
Date:
June 1, 1991
Creator:
Martin, D.F. & Heller, J.P.
Object Type:
Report
System:
The UNT Digital Library
The geothermal partnership: Industry, utilities, and government meeting the challenges of the 90's
Each year the Geothermal Division of the US Department of Energy conducts an in-depth review of its entire geothermal R D program. The conference serves several purposes: a status report on current R D activities, an assessment of progress and problems, a review of management issues, and a technology transfer opportunity between DOE and the US geothermal community. This year's conference, Program Review IX, was held in San Francisco on March 19--21, 1991. The theme of this review was The Geothermal Partnership -- Industry, Utilities, and Government Meeting the Challenges of the 90's.'' The importance of this partnership has increased markedly as demands for improved technology must be balanced with available research resources. By working cooperatively, the geothermal community, including industry, utilities, DOE, and other state and federal agencies, can more effectively address common research needs. The challenge currently facing the geothermal partnership is to strengthen the bonds that ultimately will enhance opportunities for future development of geothermal resources. Program Review IX consisted of eight sessions including an opening session. The seven technical sessions included presentations by the relevant field researchers covering DOE-sponsored R D in hydrothermal, hot dry rock, and geopressured energy and the progress associated with the Long …
Date:
January 1, 1991
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
A novel geotechnical/geostatistical approach for exploration and production of natural gas from multiple geologic strata, Phase 1
This research program has been designed to develop and verify a unique geostatistical approach for finding natural gas resources. The research has been conducted by Beckley College, Inc. (Beckley) and BDM Engineering Services Company (BDMESC) under contract to the US Department of Energy (DOE), Morgantown Energy Technology Center. Phase 1 of the project consisted of compiling and analyzing relevant geological and gas production information in selected areas of Raleigh County, West Virginia, ultimately narrowed to the Eccles, West Virginia, 7 {1/2} minute Quadrangle. The Phase 1 analysis identified key parameters contributing to the accumulation and production of natural gas in Raleigh County, developed analog models relating geological factors to gas production, and identified specific sites to test and verify the analysis methodologies by drilling. Based on the Phase 1 analysis, five sites have been identified with high potential for economic gas production. Phase 2 will consist of drilling, completing, and producing one or more wells at the sites identified in the Phase 1 analyses. The initial well is schedules to the drilled in April 1991. This report summarizes the results of the Phase 1 investigations. For clarity, the report has been prepared in two volumes. Volume 1 presents the Phase …
Date:
May 1, 1991
Creator:
Overbey, W. K. Jr.; Reeves, T. K.; Salamy, S. P.; Locke, C. D.; Johnson, H. R.; Brunk, R. et al.
Object Type:
Report
System:
The UNT Digital Library
Prediction and prevention of silica scaling at low levels of oversaturation: Case studies, and calculations for Uenotai Geothermal Field, Akita Prefecture, Japan
Production system design studies often include site-specific silica scaling field experiments, conducted because the onset and rate of scaling are believed difficult to predict, particularly at relatively low levels of oversaturation such as may exist in separators, flowlines, and injection wells. However, observed scaling occurrences (Cerro Prieto, Dixie Valley, Svartsengi, Otake, Hatchobaru, Milos, experimental work) actually conform fairly well to existing theory and rate equations. It should be possible to predict low level scaling with sufficient confidence for production and injection system design and, in cases where oversaturation is allowed, to design systems with foresight to suppress or manage the scale which develops. A promising suppression technology is fluid pH reduction by mixing with non-condensible gases and/or condensate. Calculations for injection lines at Uenotai geothermal field indicate molecular deposition at rates of 0.1 to 1 mm/yr, and some potential for particle deposition at points of turbulence, which can be suppressed by an order of magnitude with about 500 ppm CO{sub 2}. Further improvements of predictive technique will benefit from more uniformity in designing experiments, reporting results, and reporting measurements of scaling in actual production systems.
Date:
January 1, 1991
Creator:
Klein, Christopher W.; Iwata, Shun; Takeuchi, Rituo & Naka, Tohsaku
Object Type:
Article
System:
The UNT Digital Library
University of Minnesota Aquifer Thermal Energy Storage (ATES) project report on the first long-term cycle
The technical feasibility of high-temperature (>100{degrees}C) aquifer thermal energy storage (IOTAS) in a deep, confined aquifer was tested in a series of experimental cycles at the University of Minnesota`s St. Paul field test facility (FTF). This report describes the additions to the FTF for the long-term cycles and the details of the first long-term cycle (LT1) that was conducted from November 1984 through May 1985. Heat recovery; operational experience; and thermal, chemical, hydrologic, and geologic aspects of LT1 are reported. The permits for long-term cycles required the addition of a monitoring well 30.5 m from the storage well for monitoring near the edge of the thermally affected area and allowed the addition of a cation-exchange water softener to enable continuous operation during the injection phase. Approximately 62% of the 9.47 GWh of energy added to the 9.21 {times} 10{sup 4} m{sup 3} of ground water stored in the aquifer LT1 was recovered. Ion-exchange water softening of the heated and stored ground water prevented scaling in the system heat exchangers and the storage well and changed the major-ion chemistry of the stored water. Temperatures at the storage horizons in site monitoring wells reached as high as 108{degrees}C during the injection phase …
Date:
October 1, 1991
Creator:
Walton, M.
Object Type:
Report
System:
The UNT Digital Library
Surfactant-enhanced alkaline flooding field project. Annual report, Revision
The Tucker sand of Helper (KS) field is a candidate for surfactant-enhanced alkaline flooding. The geology of the Helper site is typical of many DOE Class I reservoirs. The Tucker sand of Helper field was deposited in a fluvial dominated deltaic environment. Helper oil can be mobilized with either chemical system 2 or chemical system 3, as described in this report. Oil fields in the Gulf Coast region are also good candidates for surfactant-enhanced alkaline flooding. The results from laboratory tests conducted in Berea sandstone cores with oil brine from Helper (KS) field are encouraging. The crude oil is viscous and non-acidic and, yet, was mobilized by the chemical formulations described in this report. Significant amounts of the oil were mobilized under simulated reservoir conditions. The results in Berea sandstone cores were encouraging and should be verified by tests with field core. Consumption of alkali, measured with field core, was very low. Surfactant loss appeared to be acceptable. Despite the good potential for mobilization of Helper oil, certain reservoir characteristics such as low permeability, compartmentalization, and shallow depth place constraints on applications of any chemical system in the Tucker sand. These constraints are typical of many DOE Class I reservoirs. …
Date:
October 1, 1991
Creator:
French, T. R.
Object Type:
Report
System:
The UNT Digital Library
Transient radial flow to a well in an unconfined aquifer. Part 1, An evaluation of some conceptual methods
The analytic solutions of Boulton (1954) and Neuman (1972) for transient flow to a well in an unconfined aquifer are based on the assumption that the role of the unsaturated zone can be adequately accounted for by restricting attention to the release of water from the zone through which the water table moves. Both researchers mathematically treat this released water as a time-dependent source term. The differences between the models of Boulton and Neuman are that the former neglects vertical components of flow in the aquifer, but allows for an exponential process for the release of water as a function of time, whereas the latter assumes instantaneous release from storage, but accounts for vertical components of flow. Given this set of assumptions, we examine the applicability of these two methods using a general purpose numerical model through a process of verification extension and comparison. The issues addressed include: the role of well-bore storage in masking intermediate-time behavior, combined effects of exponential release as well as vertical flow, logic for vertical averaging of drawdowns, and the sensitivity of system response to the magnitude of specific yield. The issue of how good the assumptions of Boulton and Neuman are in the context …
Date:
August 1, 1991
Creator:
Narasimhan, T. N. & Zhu, Ming
Object Type:
Report
System:
The UNT Digital Library
Installation of a Devonian Shale Reservoir Testing Facility and acquisition of reservoir property measurements
In October, a contract was awarded for the Installation of a Devonian Shale Reservoir Testing Facility and Acquisition of Reservoir Property measurements from wells in the Michigan, Illinois, and Appalachian Basins. Geologic and engineering data collected through this project will provide a better understanding of the mechanisms and conditions controlling shale gas production. This report summarizes the results obtained from the various testing procedures used at each wellsite and the activities conducted at the Reservoir Testing Facility.
Date:
September 1, 1991
Creator:
Locke, C. D. & Salamy, S. P.
Object Type:
Report
System:
The UNT Digital Library
The feasibility of recovering medium to heavy oil using geopressured- geothermal fluids
The feasibility, economics and environmental concerns of producing more domestic oil using thermal enhanced oil recovery (TEOR) are reviewed and the unique nature of geopressured-geothermal (GPGT) fluids for thermal recovery are outlined. Current methods of TEOR are briefly discussed and it is noted that these methods are presently under scrutiny by both federal and state air quality agencies; and moreover, they often involve costly operational and mechanical problems associated with heating water on the surface for injection into the target reservoir. The characteristics of the GPGT resources as seen through previous Department of Energy (DOE) studies from sites in Louisiana and Texas are discussed. These studies indicate sufficient quantities of GPGT fluids can be produced to sustain a TEOR project. The Alworth Field in the south Texas Mirando Trend is proposed as a TEOR pilot site. The target reservoirs for injection of the GPGT fluids are the Jackson and Yegua sandstones of the upper Eocene Epoch. The reservoirs contain an estimated 4 MMbbls of heavy oil in place (OIP) (18.6{degree}API) of which it is estimated that at least 1 MMbbls could be recovered by TEOR. The problems associated with using the GPGT fluids for TEOR include those normally associated with …
Date:
September 1, 1991
Creator:
Negus-de Wys, J.; Kimmell, C.E.; Hart, G.F. & Plum, M.M.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Oil and Gas Reservoir Heterogeneity
The objective of the cooperative research program is to characterize Alaskan reservoirs in terms of their reserves, physical and chemical properties, geologic configuration and structure, and the development potential. The tasks completed during this period include: (1) geologic reservoir description of Endicott Field; (2) petrographic characterization of core samples taken from selected stratigraphic horizons of the West Sak and Ugnu (Brookian) wells; (3) development of a polydispersed thermodynamic model for predicting asphaltene equilibria and asphaltene precipitation from crude oil-solvent mixtures, and (4) preliminary geologic description of the Milne Point Unit.
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Recent progress in HDR reservoir engineering
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 accessible to circulating water: i.e., the size of the HDR reservoir. This technique, after appropriate verification, will allow operators to actually quantify the size of the available thermal resource before power plant design and installation. Finally, the partitioning of reservoir fluid storage between the matrix microcracks and the network of joints has been measured at two pressure levels, one above and one below the joint opening pressure for the most favorably oriented set of joints. The observed difference in the storage partitioning above and below this threshold pressure is quite pronounced, particularly for the microcrack fraction. For any given HDR site, the measurement of this pressure-dependent storage partitioning may provide guidance as to the optimal method of reservoir production. 6 …
Date:
January 1, 1991
Creator:
Brown, D. W.
Object Type:
Article
System:
The UNT Digital Library
Subsurface stratigraphy and structure of A/M area at the Savannah River Site, Aiken County, South Carolina
This report is a study of the stratigraphy and structure of the A/M Area Hazardous Waste Management Facility Post-Closure Care Permit process on the Savannah River Site. The data from the lithologic and geophysical logs of 93 wells is the basis of this analysis.
Date:
August 1, 1991
Creator:
Fallaw, W.C.; Sims, W.R. & Haselow, J.S.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of saponite and saponite/sepiolite fluids for geothermal drilling
The rheology and other properties of drilling fluids containing saponite and a saponite-sepiolite mixture as the main vicosifier have been systematically evaluated in the temperature range of 300-600{degree}F under appropriate confining pressures up to 16,000 psi. Saponite represents the magnesium analog of the clay mineral montmorillonite, which is the main constituent in conventional bentonite-based fluids. The fluid with 6% saponite exhibits a prominent viscosity enhancement at temperatures above 250{degree}F. This viscosity enhancement is easily controlled by salts and hydroxides of Na and K. The addition of Na-polyacrylates (low- and high-molecular weight polymers) eliminates the viscosity anomaly of pure saponite fluids. These polymers also increase the filtration control of saponite. The anomalous viscosity enhancement of saponite is significantly reduced by the addition of sepiolite (a clay mineral with a fibrous morphology). 12 refs., 31 figs., 26 tabs.
Date:
February 1, 1991
Creator:
Guven, N.; Panfil, D. J. & Carney, L. L. (Texas Tech Univ., Lubbock, TX (USA). Dept. of Geosciences)
Object Type:
Report
System:
The UNT Digital Library
Geohydrology of rocks penetrated by test well USW H-6, Yucca Mountain, Nye County, Nevada
Test well USW H-6 is one of several wells drilled in the Yucca Mountain area near the southwestern part of the Nevada Test Site for investigations related to isolation of high-level nuclear waste. This well was drilled to a depth of 1,220 meters. Rocks penetrated are predominantly ash-flow tuffs of Tertiary age, with the principal exception of dacitic(?) lave penetrated at a depth from 877 to 1,126 meters. The composite static water level was about 526 meters below the land surface; the hydraulic head increased slightly with depth. Most permeability in the saturated zone is in two fractured intervals in Crater Flat Tuff. Based on well-test data using the transitional part of a dual-porosity solution, an interval of about 15 meters in the middle part of the Bullfrog Member of the Crater Flat Tuff has a calculated transmissivity of about 140 meters squared per day, and an interval of about 11 meters in the middle part of the Tram Member of the Crater Flat Tuff has a calculated transmissivity of about 75 meters squared per day. The upper part of the Bullfrog Member has a transmissivity of about 20 meters squared per day. The maximum likely transmissivity of any rocks …
Date:
December 1, 1991
Creator:
Craig, R.W. & Reed, R.L.
Object Type:
Report
System:
The UNT Digital Library
Hydrostratigraphy of the General Separations Area, Savannah River Site (SRS), South Carolina
Detailed analysis and synthesis of geophysical, core, and hydrologic data from 230 wells were used to delineate the hydrostratigraphy and aquifer characteristics of the General Separations Area at SRS. The study area is hydrologically bounded on the north and northwest by Upper Three Runs Creek (UTRC) and on the south by Fourmile Branch (FB). The Cretaceous-Tertiary sedimentary sequence underlying the study area is divided into two Aquifer Systems; in ascending order, Aquifer Systems I and 11. The study concentrated on Aquifer System U, which includes all the Tertiary sediments above the Black Mingo Group (Paleocene) to the water table. This report includes a series of lithostratigraphic cross-sections, piezometric gradient profiles, head ratio contour maps, aquifer isopach maps, and potentiometric surface maps which illustrate the aquifer characteristics of the study area.
Date:
January 1, 1991
Creator:
Aadland, R. K.; Harris, M. K.; Lewis, C. M.; Gaughan, T. F. & Westbrook, T. M.
Object Type:
Report
System:
The UNT Digital Library
Hydrochemical features of a geothermal test well iin a volcanic caldera, MT. Pinatubo, Philippines
Mt. Pinatubo is one of several recent-age volcanoes along the west Luzon volcanic arc. A fumarole near the suminit emits gases with magmatic characteristics. Several thermal springs on the east and west flanks yield various fluid typos, including neutral chloride and bicarbonate. Three wellbores probed the Mt. Pinatubo caldera from elevations of +1230 through -1600 mRSL. Trajectories may be described as: central, crossing a boundary wall from the inside, and skirting a wall [probably] on the inside. Brine discharges indicate severe evapo-concentration effects accompanied by other phenomena. Severity of evapo-concentration indicates low fluid mobility near the wellbores. Large variations for ratios of component concentrations were observed, indicating negligible natural circulation (mixing). Implications about fluid movements and heat transfer processes are explored. Three components of steam can be quantified and all are significant: separate entry, adiabatic boiling, and boiling by rock heat.
Date:
January 1, 1991
Creator:
Michels, D. E.; Clemente, V. C. & Ramos, M. N.
Object Type:
Article
System:
The UNT Digital Library
Uncle Sam's Warriors: American Indians in World War II
Article highlights the contributions of American Indians during World War II, which included the efforts of individual soldiers and people groups as well as the use of land and resources on reservations for the war effort. Duane K. Hale emphasizes the underrepresentation of these activities in historical record and discusses them here.
Date:
Winter 1991
Creator:
Hale, Duane K.
Object Type:
Article
System:
The Gateway to Oklahoma History
Current techniques in acid-chloride corrosion control and monitoring at The Geysers
Acid chloride corrosion of geothermal well casings, production piping and power plant equipment has resulted in costly corrosion damage, frequent curtailments of power plants and the permanent shut-in of wells in certain areas of The Geysers. Techniques have been developed to mitigate these corrosion problems, allowing continued production of steam from high chloride wells with minimal impact on production and power generation facilities.The optimization of water and caustic steam scrubbing, steam/liquid separation and process fluid chemistry has led to effective and reliable corrosion mitigation systems currently in routine use at The Geysers. When properly operated, these systems can yield steam purities equal to or greater than those encountered in areas of The Geysers where chloride corrosion is not a problem. Developments in corrosion monitoring techniques, steam sampling and analytical methodologies for trace impurities, and computer modeling of the fluid chemistry has been instrumental in the success of this technology.
Date:
January 1, 1991
Creator:
Hirtz, Paul; Buck, Cliff & Kunzman, Russell
Object Type:
Article
System:
The UNT Digital Library
Modeling of surfactant transport and adsorption in porous media
When surfactant solution is flowing in a reservoir formation, surfactants will be diluted by flow dispersion, retained in dead-end pores, adsorbed on rock surfaces, or precipitated due to ion exchange. The loss of surfactant will be detrimental to the performance of gas foam. Information of surfactant concentration profiles in reservoir formations is essential for gas foaming technique development. The major objective of this research is to investigate with mathematical models the transport and dynamic adsorption of surfactants in porous media. The mathematical models have taken into account the convection, dispersion, capacitance, and adsorption effects on concentrations of surfactants. Numerical methods and computer programs have been developed which can be used to match experimental results and to determine the characterization parameters in the models. The models can be included in foam simulation programs to calculate surfactant concentration profiles in porous media. A flow experimental method was developed to measure the effluent surfactant concentration, which will be used to determine the model parameters. Commercial foaming agent Alipal CD-128 was used in this study. Equilibrium adsorption and surfactant precipitation have been tested. Tracer solutions with a nonadsorbing solute such as dextrose and sucrose were used to determine the dispersion parameters for the experimental …
Date:
April 1, 1991
Creator:
Chung, F. T. H.
Object Type:
Report
System:
The UNT Digital Library
Progress in The Lost Circulation Technology Development Program
Lost circulation is the loss of drilling fluid from the wellbore to fractures or pores in the rock formation. In geothermal drilling, lost circulation is often a serious problem that contributes greatly to the cost of the average geothermal well. The Lost Circulation Technology Development Program is sponsored at Sandia National Laboratories by the US Department of Energy. The goal of the program is to reduce lost circulation costs by 30--50{percent} through the development of mitigation and characterization technology. This paper describes the technical progress made in this program during the period April, 1990--March, 1991. 4 refs., 15 figs., 1 tab.
Date:
January 1, 1991
Creator:
Glowka, D. A.; Schafer, D. M.; Loeppke, G. E. & Wright, E. K.
Object Type:
Article
System:
The UNT Digital Library
Geothermal demonstration: Zunil food dehydration facility
A food dehydration facility was constructed near the town of Zunil, Guatemala, to demonstrate the use of geothermal energy for industrial applications. The facility, with some modifications to the design, was found to work quite satisfactorily. Tests using five different products were completed during the time geothermal energy was used in the plant. During the time the plant was not able to use geothermal energy, a temporary diesel-fueled boiler provided the energy to test dehydration on seven other crops available in this area. The system demonstrates that geothermal heat can be used successfully for dehydrating food products. Many other industrial applications of geothermal energy could be considered for Zunil since a considerable amount of moderate-temperature heat will become available when the planned geothermal electrical facility is constructed there. 6 refs., 15 figs., 7 tabs.
Date:
August 1, 1991
Creator:
Maldonado, O. (Consultecnia, Guatemala City (Guatemala)); Altseimer, J.; Thayer, G.R. (Los Alamos National Lab., NM (United States)); Cooper, L. (Energy Associates International, Albuquerque, NM (United States)) & Caicedo, A. (Unidad de Desarrollo Geotermico, Guatemala City (Guatemala). Inst. Nacional de Electrificacion)
Object Type:
Report
System:
The UNT Digital Library
Oil and Gas Field Code Master List 1990
This is the ninth annual edition of the Energy Information Administration's (EIA) Oil and Gas Field Code Master List. It reflects data collected through October 1990 and provides standardized field name spellings and codes for all identified oil and/or gas fields in the United States. There are 54,963 field records in this year's Oil and Gas Field Code Master List (FCML). This amounts to 467 more than in last year's report. As it is maintained by EIA, the Master List includes: Field records for each state and county in which a field resides; field records for each offshore area block in the Gulf of Mexico in which a field resides;field records for each alias field name; fields crossing state boundaries that may be assigned different names by the respective state naming authorities.
Date:
January 4, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
One-dimensional human intrusion analysis of the paleozoic aquifer, as part of the site suitability effort at Yucca Mountain, Nevada
A programmatic need was identified by the US Department of Energy, through the Office of Civilian Radioactive Waste Management, for a preliminary ``site suitability`` performance assessment for the Yucca Mountain site. The effort is designed to integrate field, laboratory, and modeling information to identify key technical issues that need to be addressed and determine which field parameters are important during site characterization. This report examines one-dimensional transport of radionucldies in the Paleozoic aquifer. The problem is based on a human intrusion scenario which introduces a point source of radionuclides directly into the aquifer. This effort is only one part of the larger site suitability effort. 10 refs., 2 figs., 10 tabs.
Date:
July 1, 1991
Creator:
McGraw, M. A.; Burdick, K. W. & Eslinger, P. W.
Object Type:
Report
System:
The UNT Digital Library
A novel geotechnical/geostatistical approach for exploration and production of natural gas from multiple geologic strata, Phase 1. Volume 2, Geology and engineering
This research program has been designed to develop and verify a unique geostatistical approach for finding natural gas resources. The project has been conducted by Beckley College, Inc., and BDM Engineering Services Company (BDMESC) under contract to the US Department of Energy (DOE), Morgantown Energy Technology Center (METC). This section, Volume II, contains a detailed discussion of the methodology used and the geological and production information collected and analyzed for this study. A companion document, Volume 1, provides an overview of the program, technique and results of the study. In combination, Volumes I and II cover the completion of the research undertaken under Phase I of this DOE project, which included the identification of five high-potential sites for natural gas production on the Eccles Quadrangle, Raleigh County, West Virginia. Each of these sites was selected for its excellent potential for gas production from both relatively shallow coalbeds and the deeper, conventional reservoir formations.
Date:
May 1, 1991
Creator:
Overbey, W. K. Jr.; Reeves, T. K.; Salamy, S. P.; Locke, C. D.; Johnson, H. R.; Brunk, R. et al.
Object Type:
Report
System:
The UNT Digital Library