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in creator/contributor: "Benson, S.M."

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Interpretation of interference data from the Klamath Falls, Oregon geothermal resource

Data from a seven week pressure interference test in the Klamath Falls, Oregon geothermal resource have been analyzed. The data indicate that productive wells are fed by a highly permeable fracture network and that the less permeable matrix blocks contribute significantly to the reservoir storage capacity. Detailed analysis of data from two wells is presented. Data from both of the wells yield a reservoir permeability-thickness (kh) of approximately 1.3x10/sup 6/ md-ft and a storativity (phi c/… more

Date: November 1, 1983

Creator: Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Computerized data acquisition system for production, injection and interference tests

A computer-based system for collecting, processing, and analyzing pressure transient data has been developed. Primary components include downhole pressure sensors, linedrivers, a micro-computer, data storage disk, scanner, frequency counter, digital voltmeter, power supply, graphics plotter, and printer. In-field data processing and analysis greatly aid in handling the large volume of data that are collected during pressure transients tests, particularly the multiwell interference tests that ar… more

Date: June 1, 1986

Creator: Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development and use of a high temperature downhole flowmeter for geothermal well logging

The development and use of a high temperature (300/sup 0/C) downhole flowmeter for geothermal well logging are discussed. The availability of the instrument gives the reservoir engineer a powerful tool for formation evaluation and studying wellbore dynamics. The instrument components, their function, and temperature limitations are discussed in detail. Several field examples of spinner log interpretation are also presented.

Date: December 1, 1983

Creator: Solbau, R.D.; Goranson, C.B. & Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Summary of well-testing activities at Lawrence Berkeley Laboratory, 1975-1983

Well test data collected from various geothermal fields by the geothermal group at Lawrence Berkeley Laboratory are presented. The type of well tests conducted, the instrumentation used and the data collected are described. Experience gained through interpretation of the data has helped identify problems in test procedures and interpretative methods.

Date: August 1, 1983

Creator: Bodvarsson, M.G. & Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation of city well 1, Klamath Falls, Oregon

A city-wide geothermal space heating project is currently under development at Klamath Falls, Oregon. The first phase of the project will require two production wells. Geothermally heated water will be used to heat 14 city, county, state, and federal buildings. At peak load the heating system will require approximately 750 gpm of 200{sup 0}F (or greater) geothermal brine. The first production well was spudded on August 29, 1979. During drilling a major lost circulation zone was encountered betw… more

Date: April 1, 1980

Creator: Benson, S.M.; Goranson, C.B. & Schroeder, R.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of injection tests in liquid-dominated geothermal reservoirs

The objective was to develop procedures for analyzing nonisothermal injection test data during the early phases of injection. In particular, methods for determining the permeability-thickness of the formation, skin factor of the well and tracking the movement of the thermal front have been developed. The techniques developed for interpreting injection pressure transients are closely akin to conventional groundwater and petroleum techniques for evaluating these parameters. The approach taken was… more

Date: December 1, 1984

Creator: Benson, S.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

New method for evaluating composite reservoir systems

A simple new technique has been developed for evaluating interference test data in radially symmetric composite reservoirs. The technique is based on the realization that systematic variations in the apparent storage coefficient (calculated from semi-log analysis of the late-time data are indicative of a two-mobility (k/..mu..) reservoir. By analyzing variations in the apparent storage coefficient, both the mobility and size of the inner region can be calculated. The technique is particularly u… more

Date: March 1, 1985

Creator: Benson, S.M. & Lai, C.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A modeling of buoyant gas plume migration

This work is motivated by the growing interest in injecting carbon dioxide into deep geological formations as a means of avoiding its atmospheric emissions and consequent global warming. Ideally, the injected greenhouse gas stays in the injection zone for a geologic time, eventually dissolves in the formation brine and remains trapped by mineralization. However, one of the potential problems associated with the geologic method of sequestration is that naturally present or inadvertently created … more

Date: December 1, 2008

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

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pressure transient method for front tracking

A pressure transient technique for tracking the advance of cold water fronts during water flooding and goethermal injection operations has been developed. The technique is based on the concept that the steady state pressure buildup in the reservoir region inside the front can be calculated by a fluid skin factor. By analyzing successive pressure falloff tests, the advance of the front in the reservoir can be monitored. The validity of the methods is demonstrated by application to three numerica… more

Date: August 1, 1983

Creator: Benson, S.M. & Bodvarsson, G.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent geothermal reservoir engineering activities at Lawrence Berkeley Laboratory

This paper briefly describes the most recent activities in reservoir engineering for the geothermal group of Lawrence Berkeley Laboratory (LBL). The primary emphasis of the geothermal program of LBL is dedicated to reservoir engineering including theoretical investigations, the development and application of mathematical models, and field studies. The objectives of these activities are to develop and validate methods and instruments which will be utilized in the determination of the parameters … more

Date: September 1, 1987

Creator: Lippmann, M.J.; Bodvarsson, G.S.; Benson, S.M. & Pruess, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Technology transfer report: feasibility study for the use of geothermal brine in the Ashdod area, Israel

The hydrothermal potential of the Ashdod area, Israel, was evaluated to determine its suitability as the low grade energy source required to operate the Ashdod desalination plant. An estimated 1250 cubic meters per hour of 120/sup 0/C brine would be adequate to supply the hot water necessary for operating the desalination plant. Considerable interest in oil exploration in the Ashdod area resulted in the drilling of six wells into the Jurassic formations by Oil Exploration (Investments) Ltd. (OE… more

Date: August 1, 1984

Creator: Benson, S.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Well-test data from geothermal reservoirs

Extensive well testing in geothermal resources has been carried out throughout the western United States and in northern Mexico since 1975. Each resource tested and each well test conducted by LBL during the eight-year period are covered in brief. The information, collected from published reports and memoranda, includes test particulars, special instrumentation, data interpretation when available, and plots of actual data. Brief geologic and hydrologic descriptions of the geothermal resources a… more

Date: September 1, 1982

Creator: Bodvarsson, M.G. & Benson, S.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Permeability enhancement due to cold water injection: A Case Study at the Los Azufres Geothermal Field, Mexico

Pressure transient buildup and falloff data from 3 wells at the Los Azufres geothermal field have been evaluated to determine the extent to which cold water infection increases the permeability of the near-bore reservoir formation. Simultaneous analysis of the buildup and falloff data provides estimates of the permeability-thickness of the reservoir, the skin factor of the well, and the degree of permeability enhancement in the region behind the thermal front. Estimates of permeability enhancem… more

Date: April 1, 1989

Creator: Benson, S.M.; Daggett, J.; Ortiz, J.; Iglesias, E. (Lawrence Berkeley Lab., CA (USA); Comision Federal de Electricidad, Morelia (Mexico) & Instituto de Investigaciones Electricas, Cuernavaca (Mexico))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of nonisothermal injection and falloff tests in layered reservoirs

The effects of reservoir layering and gravity segregation on nonisothermal injection and falloff tests are investigated. Results show that layering does not affect injection or falloff data if all the layers are permeable and accept fluids from the wellbore. In such cases, the average permeability, skin factor, and distance to the thermal front can be calculated using the techniques developed for homogeneous reservoirs. Special considerations have to be taken for cases where several layers are … more

Date: March 1, 1985

Creator: Halfman, S.E. & Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recently developed well test insrumentation for low-to-moderate temperature hydrothermal reservoirs

The engineering drawings, assembly instructions, and recommended usage for several of the instruments developed for low and moderate temperature (< 150/sup 0/C) hydrothermal well testing are presented. Included are the drawings for: a downhole pressure and temperature instrument, a multi-conductor cablehead, a line driver to be used with the downhole pressure and temperature instrument, and a fluid-level detector.

Date: August 1, 1981

Creator: Solbau, R.; Goranson, C.B. & Benson, S.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Anticipated soil selenium concentrations at Kesterson Reservoir

Temporal trends from soil monitoring data collected at Kesterson Reservoir have been reviewed to shed light on anticipated concentrations of total and water-extractable selenium in surface and subsurface soils. Based on these data, a mass balance model for selenium has been developed and employed to evaluate the rate of leaching, remobilization and volatilization that has occurred since the Reservoir was dried out in 1987. Results from a series of calibration runs were then extrapolated 25 year… more

Date: October 1, 1992

Creator: Benson, S.M.; Tokunaga, T.K. & Zawislanski, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nonisothermal effects during injection and falloff tests

The results show that to correctly analyze pressure transients governed by a moving thermal front, the values used for the fluid properties must correspond to the temperature of the injected fluid. On the other hand, for pressure falloff tests and for injection tests conducted in a well cooled by previous injection or drilling, the physical properties of the in situ reservoir fluids must be used. It is also shown that the application of conventional isothermal methods for calculating skin value… more

Date: September 1, 1982

Creator: Benson, S.M. & Bodvarsson, G.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Application of an expert system for analysis of geothermal well tests

WES is an expert system designed at Lawrence Berkeley Laboratory for interpreting well test data. The results of WES's analyses of two geothermal well tests are compared to those calculated using traditional methods. WES is well suited for analyzing well tests in geothermal systems because it is robust enough to carry out analyses of data sets that are noisy or incomplete. It also has a broad knowledge base that recognizes most of the hydrogeologic characteristics observed in geothermal systems… more

Date: March 1, 1990

Creator: Mensch, A. & Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Interpretation of Interference Data from the Klamath Falls, Oregon Geothermal Resource

Date: December 15, 1983

Creator: Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Development and Use of a High Temperature Downhole Flowmeter for Geothermal Well Logging

This paper discusses the development and use of a high temperature (300{degrees}C) downhole flowmeter for geothermal well logging. The availability of the instrument gives the reservoir engineer a powerful tool for formation evaluation and studying wellbore dynamics. The instrument components, their function, and temperature limitations are discussed in detail. Several field examples of spinner log interpretation are also presented.

Date: December 15, 1983

Creator: Solbau, R.D.; Goranson, C.B. & Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hydrologic Properties of Aquifers in the Central Savannah River Area

The hydrologic properties of selected aquifer systems underlying the Milhaven and Girard sites in Georgia were determined through a series of aquifer performance tests performed from October, 1994 to January, 1995. At the Milhaven site, the systems under investigation consisted of the upper, middle and lower components of the Upper Floridan, the lower Dublin, and the lower Midville aquifers. At the Dublin site, only the lower Dublin and lower Midville aquifers were tested. In addition, the hydr… more

Date: January 2, 1996

Creator: Snipes, D.S.; Benson, S.M.; Price Jr., Van & Temples, T.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Land disposal of San Luis drain sediments: Progress Report October 1998 through November 2000

Lawrence Berkeley National Laboratory (LBNL), in collaboration with the US Bureau of Reclamation and the Panoche Water District, is conducting a pilot-scale test of the viability of land application of selenium (Se)-enriched San Luis Drain (SLD) sediments. Local land disposal is an attractive option due to its low cost and the proximity of large areas of available land. Two modes of disposal are being tested: (1) the application to a nearby SLD embankment, and (2) the application to and incorpo… more

Date: June 1, 2001

Creator: Zawislanski, P.T.; Benson, S.M.; TerBerg, R. & Borglin, S.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Carbon sequestration with enhanced gas recovery: Identifying candidate sites for pilot study

Depleted natural gas reservoirs are promising targets for carbon dioxide sequestration. Although depleted, these reservoirs are not devoid of methane, and carbon dioxide injection may allow enhanced production of methane by reservoir repressurization or pressure maintenance. Based on the favorable results of numerous simulation studies, we propose a field test of the Carbon Sequestration with Enhanced Gas Recovery (CSEGR) process. The objective of the field test is to evaluate the feasibility o… more

Date: March 1, 2001

Creator: Oldenburg, C.M. & Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Selenium fractionation and cycling in the intertidal zone of the Carquinez Strait. Quarterly progress report, January 1996--March 1996

This quarterly report describes research on selenium (Se) cycling in the marshes and mudflats of the Carquinez Strait between January 1, 1996 and March 31, 1996. Chapter 2 contains descriptions of results of extractions and analyses of sediment cores from the intertidal zone of the Martinez and Benicia field sites, including some x-ray spectroscopy data related to the characterization of the sediment Eh-pH regime. Chapter 3 contains a summary of work in progress on the extraction of various Se … more

Date: April 1, 1996

Creator: Zawislanski, P.T.; Benson, S.M. & Brownfield, A.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department