32 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Boreholes"  
Results: 1 - 24 next
open access

Seismic velocities and attenuation in an underground granitic waste repository subjected to heating

Description: The behavior of a granitic rock mass subjected to thermal load has been studied by an acoustic cross-hole technique between four boreholes, over a period of some two years. Velocities between boreholes were obtained from the times-of-flight of pulses of acoustic waves between transducers clamped to the borehole wall. The attenuation was obtained by a spectral ratios technique. When the heater was turned on, the velocities increased rapidly to an asymptotic value. When the heater was turned off,… more
Date: March 1, 1984
Creator: Paulsson, B.N.P. & King, M.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of borehole electromagnetic and seismic detection of fractures

Description: Experiments were conducted to establish the feasibility of downhole high-frequency techniques for location of fractures in the vicinity of boreholes. An existing flame-cut slot in granite was filled with salt water to simulate a brine-filled fracture. The first method used an electromagnetic wave at 30 to 300 MHz, vhf frequencies. A transmitter consisting of a phased dual-dipole array arranged to provide a directional signal toward the fracture was installed in a borehole opposite the fracture.… more
Date: February 1, 1984
Creator: Chang, H. T.; Suhler, S. A. & Owen, T. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Well installation and boring report for the proposed SRC-1 facility at Newman, Kentucky

Description: Dames and Moore conducted a geohydrologic investigation at the proposed Solvent-Refined Coal (SRC-I) Demonstration Plant Site. Task 1 involved drilling 14 borings to aid in further determining the location and extent of a clay body known to lie along the floodplain at the southern edge of the site. Task 2 included installation of 13 stainless steel groundwater observation wells throughout the site in order to expand the groundwater flow information provided by 10 existing wells.
Date: January 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Calibration of a neutron log in partially saturated media IV: effects of sonde-wall gap

Description: A gap between a neutron sonde and the wall of a borehole can have a significant effect on the observed count rate. This effect was determined experimentally to be linear with gaps as large as 2.5 cm. The count rate is given by N/sub N/ = K/sub 0/ + K/sub 1/g where K/sub 0/ is the count rate that would be observed at zero gap, and g is the gap. The parameters K/sub 0/ and K/sub 1/ are dependent on both water (ie. hydrogen) content and bulk density. In many situations failure to correct the count… more
Date: March 8, 1984
Creator: Axelrod, M. C. & Hearst, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Barometric pressure transient testing applications at the Nevada Test Site: formation permeability analysis. Final report

Description: The report evaluates previous investigations of the gas permeability of the rock surrounding emplacement holes at the Nevada Test Site. The discussion sets the framework from which the present uncertainty in gas permeability can be overcome. The usefulness of the barometric pressure testing method has been established. Flow models were used to evaluate barometric pressure transients taken at NTS holes U2fe, U19ac and U20ai. 31 refs., 103 figs., 18 tabs. (ACR)
Date: December 1, 1984
Creator: Hanson, J.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Workshop on borehole measurements and interpretation in scientific drilling - identification of problems and proposals for their solution: proceedings

Description: Critical instrumentation needs for borehole-oriented, geoscience research were identified in a program consisting of formal presentations, psoter sessions and a workshop. The proceedings include results of the workshops, abstracts of the papers and poster sessions, and the attendance list. Details of any of the presentations should be obtained from the individual authors. Separate entries were prepared for individual presentations.
Date: March 1, 1984
Creator: Cooper, D. L. & Traeger, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Priorities for a national program of continental drilling for scientific purposes

Description: The two reports, Continental Drilling and Continental Scientific Drilling Program, form a basis for this report and provide comprehensive discussions of the subject of continental drilling for scientific purposes in a number of research areas. The purpose of this report is to present a specific recommendation of the Continental Scientific Drilling Committee on where the first deep hole dedicated to scientific exploration of the continental crust in the United States should be located. The most … more
Date: January 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Summary of the oil shale fragmentation program at Anvil Points Mine, Colorado

Description: During 1981 and 1982, an extensive oil shale fragmentation research program was conducted at the Anvil Points Mine near Rifle, Colorado. The primary goals were to investigate factors involved for adequate fragmentation of oil shale and to evaluate the feasibility of using the modified in situ retort (MIS) method for recovery of oil from oil shale. The test program included single-deck, single-borehole tests to obtain basic fragmentation data; multiple-borehole, multiple-deck explosive tests to … more
Date: January 1, 1984
Creator: Dick, R.D.; Young, C. & Fourney, W.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radiological survey report for the Weldon Spring Raffinate Pits site, Weldon Spring, Missouri

Description: The Weldon Spring Site (WSS) is a US Department of Energy (DOE) surplus facility comprising the Raffinate Pits facility, the Quarry, and potentially contaminated vicinity properties. Radiological characterization of the WSS will be conducted in three phases: the Raffinate Pits facility, Quarry, and the vicinity properties. Bechtel National, Inc. (BNI) and its radiological support subcontractor, Eberline Instrument Corporation (EIC), conducted a radiological characterization survey of the Raffin… more
Date: August 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Deep drilling technology for hot crystalline rock

Description: The development of Hot Dry Rock (HDR) geothermal systems at the Fenton Hill, New Mexico site has required the drilling of four deep boreholes into hot, Precambrian granitic and metamorphic rocks. Thermal gradient holes, four observation wells 200 m (600 ft) deep, and an exploration core hole 800 m (2400 ft) deep guided the siting of the four deep boreholes. Results derived from the exploration core hole, GT-1 (Granite Test No. 1), were especially important in providing core from the granitic ro… more
Date: January 1, 1984
Creator: Rowley, J.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Logging technology for high-temperature geothermal boreholes

Description: Research in materials, equipment, and instrument development was required in the Hot Dry Rock Energy Extraction Demonstration at Fenton Hill located in northern New Mexico. Results of this extensive development advanced the logging technology in geothermal boreholes to present state-of-the art. The new Phase II Energy Extraction System at the Fenton Hill Test Site will consist of two wellbores drilled to a depth of about 4570 m (15,000 ft) and then connected by a series of hydraulic-induced fra… more
Date: May 1, 1984
Creator: Dennis, B.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Computer simulation of the cooling effect due to circulation in four geothermal well models

Description: Computer calculations of wellbore transient temperatures, using the geothermal wellbore thermal simulator code GEOTEMP2, were made on four well models. The well models studied were from the Baca geothermal area, the East Mesa geothermal area, and a shallow and a deep well from the Salton Sea geothermal area. Calculations for one day of water circulation followed by one day of shut-in at flow rates of 100, 250, 500, and 1000 gpm were made to investigate the cooling effects produced by the circul… more
Date: November 1, 1984
Creator: Duda, L.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Drilling and thermal gradient measurements at US Marine Corps Air Ground Combat Center, Twentynine Palms, California. Final report, October 1, 1983-March 31, 1984

Description: Seven temperature gradient holes were drilled at the Marine Corps Air Ground Combat Center, Twentynine Palms, California, as part of a cooperative research and development program, jointly funded by the Navy and Department of Energy. The purpose of this program was to assess geothermal resources at selected Department of Defense installations. Drill site selection was based on geophysical anomalies delineated by combined gravity, ground magnetic and aeromagnetic surveys. Temperature gradients r… more
Date: January 1, 1984
Creator: Trexler, D.T.; Flynn, T. & Ghusn, G. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Studies on explosively driven cracks under confining in-situ stresses

Description: Successful explosive gas well stimulation requires a thorough understanding of explosively driven cracks under confining in-situ stresses. In a previous paper (Simha, et al 1983) the problem of explosively driven cracks was experimentally investigated to reveal the features of crack propagation. It was observed that the explosively driven crack propagation is the result of two different but overlapping phases. The first phase involving the initiation and early time crack propagation is entirely… more
Date: January 1, 1984
Creator: Simha, K. R. Y.; Fourney, W. L. & Dick, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A national drilling program to study the roots of active hydrothermal systems related to young magmatic intrusions

Description: The importance of studies of active hydrothermal-magma systems as part of a national continental scientific drilling program has been emphasized in numerous workshops and symposia. The present report, prepared by the Panel on Thermal Regimes of the Continental Scientific Drilling Committee, both reinforces and expands on earlier recommendations. The US Geodynamics Committee 1979 report of the Los Almos workshop, Continental Scientific Drilling Program, placed major emphasis on maximizing the sc… more
Date: January 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mineral resources: Research objectives for continental scientific drilling

Description: The importance of a scientific drilling program to study mineralized hydrothermal systems has been emphasized in numerous workshops and symposia. To some degree the present report, prepared by the Panel on Mineral Resources of the Continental Scientific Drilling Committee, both reinforces and expands upon earlier recommendations. The report of the Los Alamos workshop, Continental Scientific Drilling Program, placed a major emphasis on maximizing the industry and government, supplementing these … more
Date: January 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reservoir modeling of the Phase II Hot Dry Rock System

Description: The Phase II system has been created with a series of hydraulic fracturing experiments at the Fenton Hill Hot Dry Rock site. Experiment 2032, the largest of the fracturing operations, involved injecting 5.6 million gallons (21,200m/sup 3/) of water into wellbore EE-2 over the period December 6-9, 1983. The experiment has been modeled using geothermal simulator FEHM developed at Los Alamos National Laboratory. The modeling effort has produced strong evidence of a large highly fractured reservoir… more
Date: January 1, 1984
Creator: Zyvoloski, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Study of fracture pressurization as a result of explosive detonation

Description: This paper describes a number of model tests conducted in plexiglas models to investigate the phenomenon of fracture pressurization. The models were examined with high speed photography while being subjected to explosive loading. At the same time pressure transducers were used to record the pressure in the borehole as a function of time and also along the path of the propagating fracture to measure the pressure at various locations along the fracture as a function of time. Both propellants and … more
Date: June 1, 1984
Creator: Fourney, W. L.; Simha, K. R. Y. & Dick, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Coupled gas flow/solid dynamics model for predicting the formation of fracture patterns in gas well simulation experiments. [Propellant mixture used instead of explosives to fracture rock surrounding borehole]

Description: A two-dimensional finite element model for predicting fracture patterns obtained in high energy gas fracture experiments is presented. In these experiments, a mixture of propellants is used instead of explosives to fracture the rock surrounding the borehole. The propellant mixture is chosen to tailor the pressure pulse so that multiple fractures emanate from the borehole. The model allows the fracture pattern and pressure pulse to be calculated for different combinations of propellant mixture, … more
Date: July 1, 1984
Creator: Taylor, L.M.; Swenson, D.V. & Cooper, P.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Research and development activities in geothermal drilling, completion and logging

Description: The principal goal in this program is the development of an advanced driling system that can drastically reduce well costs. The program is defined in five basic elements: rock penetration mechanics, fluid technology, borehole mechanics, diagnostics, and permeability enhancement. Each of these elements are briefly summarized with examples of typical projects in each area.
Date: May 1, 1984
Creator: Finger, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geoscience experiments in boreholes: instrumentation

Description: Drilling is the only method available to obtain unambiguous information on processes occurring in the earth's crust. When core and virgin formation fluid samples are available, the geological state of the formation may be defined in the vicinity of the borehole with little ambiguity. Unfortunately, core recovery is expensive and often not complete, and drilling muds contaminate formation fluids. Thus, investigations turn to downhole instrumentation systems to evaluate in situ formation paramete… more
Date: May 1, 1984
Creator: Traeger, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Impact of fluid expansion and contraction on completion techniques for hot wells

Description: The thermal expansion and contraction of fluid with large changes in temperature can cause significant changes in (1) fluid displacement volumes, (2) pressure gradients in columns of fluid, (3) compressibility of the fluid, and (4) pressure in unported enclosures. In conjunction with the completion of Fenton Hill Hot Dry Rock (HDR) Wells EE-2 and EE-3 methods have been developed to calculate and compensate for expansion and contraction of wellbore fluids. These methods are outlined and specific… more
Date: January 1, 1984
Creator: Dreesen, D. S. & Nicholson, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of a borehole directional antenna at VHF

Description: The feasibility of constructing a directional VHF (30 MH/sub z/ to 300 MH/sub z/) antenna to physically fit into a small borehole is investigated. The study was carried out in a test chamber containing a 15 cm diameter borehole surrounded by sand which can be moistened with water or brine to adjust the dielectric constant and electrical conductivity. Electric field measurements were made for an eccentrically positioned monopole, a corner reflector and a two-element array for a number of possibl… more
Date: March 1, 1984
Creator: Chang, H. T. & Scott, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen