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in subjects: "Hydraulic Fractures"

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Permeability damage to natural fractures caused by fracturing fluid polymers

Formation damage studies using artificially fractured, low-permeability sandstone cores indicate that viscosified fracturing fluids can severely restrict gas flow through these types of narrow fractures. These studies were performed in support of the Department of Energy's Multiwell Experiment (MWX). Extensive geological and production evaluations at the MWX site indicate that the presence of a natural fracture system is largely responsible for unstimulated gas production. The laboratory format… more

Date: April 1, 1988

Creator: Gall, B. L.; Sattler, A. R.; Maloney, D. R. & Raible, C. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Stimulation model for lenticular sands: Volume 2, Users manual

This User's Manual contains information for four fracture/proppant models. TUPROP1 contains a Geertsma and de Klerk type fracture model. The section of the program utilizing the proppant fracture geometry data from the pseudo three-dimensional highly elongated fracture model is called TUPROPC. The analogous proppant section of the program that was modified to accept fracture shape data from SA3DFRAC is called TUPROPS. TUPROPS also includes fracture closure. Finally there is the penny fracture a… more

Date: July 1, 1987

Creator: Rybicki, E.F.; Luiskutty, C.T.; Sutrick, J.S.; Palmer, I.D.; Shah, G.H. & Tomutsa, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analysis of well test data---Application of probabilistic models to infer hydraulic properties of fractures. [Contains list of standardized terminology or nomenclatue used in statistical models]

Statistical and probabilistic methods for estimating the probability that a fracture is nonconductive (or equivalently, the conductive-fracture frequency) and the distribution of the transmissivities of conductive fractures from transmissivity measurements made in single-hole injection (well) tests were developed. These methods were applied to a database consisting of over 1,000 measurements made in nearly 25 km of borehole at five sites in Sweden. The depths of the measurements ranged from nea… more

Date: September 27, 1991

Creator: Osnes, J. D. (RE/SPEC, Inc., Rapid City, SD (United States)); Winberg, A.; Andersson, J. E. & Larsson, N. A. (Sveriges Geologiska AB, Goeteborg (Sweden))

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Fourteenth workshop geothermal reservoir engineering: Proceedings

The Fourteenth Workshop on Geothermal Reservoir Engineering was held at Stanford University on January 24--26, 1989. Major areas of discussion include: (1) well testing; (2) various field results; (3) geoscience; (4) geochemistry; (5) reinjection; (6) hot dry rock; and (7) numerical modelling. For these workshop proceedings, individual papers are processed separately for the Energy Data Base.

Date: January 1, 1989

Creator: Ramey, H. J., Jr.; Kruger, P.; Horne, R. N.; Miller, F. G.; Brigham, W. E. & Cook, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

FRACTURE ENHANCED SOIL VAPOR EXTRACTION TECHNOLOGY DEMONSTRATION AT THE A-014 OUTFALL

Data collected during this study show that the performance of hydraulically fractured wells (with respect to mass removal rates) may tend to decrease with time following precipitation events. These effects are due to temporary increases in water saturation in the formation within the vicinity of the fractures, therefore, the wells should tend to rebound during subsequent dry periods. The data available for fractured well versus conventional well performance (with respect to flow rate versus vac… more

Date: March 12, 2008

Creator: Riha, B; Warren Hyde, W & Richard Hall (NOEMAIL), R

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Natural and Induced Fracture Diagnostics from 4-D VSP Low Permeability Gas Reservoirs

Tight gas sand reservoirs generally contain thick gas-charged intervals that often have low porosity and very low permeability. Natural and induced fractures provide the only means of production. The objective of this work is to locate and characterize natural and induced fractures from analysis of scattered waves recorded on 4-D (time lapse) VSP data in order to optimize well placement and well spacing in these gas reservoirs. Using model data simulating the scattering of seismic energy from h… more

Date: September 30, 2008

Creator: Willis, Mark E.; Burns, Daniel R. & Toksoz, M. Nafi

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Location of hydraulic fractures using microseismic techniques

Microearthquakes with magnitudes ranging between -6 and -2 have been observed in three successive massive injections of water at the Hot Dry Rock Geothermal Energy demonstration site at Fenton Hill, New Mexico. The injection was part of a program to increase the heat transfer area of hydraulic fractures and to decrease the flow-through impedance between wells. The microearthquakes were used in mapping the location of the extended hydraulic fractures. A downhole triaxial system positioned approx… more

Date: January 1, 1980

Creator: Albright, J.A. & Pearson, C.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Integrated real-time fracture-diagnostics instrumentation system

The use of an integrated, real-time fracture-diagnostics instrumentation system for the control of the fracturing treatment during massive hydraulic fracturing is proposed. The proposed system consists of four subsystems: an internal-fracture-pressure measurement system, a fluid-flow measurement system, a borehole seismic system, and a surface-electric-potential measurement system. This use of borehole seismic and surface-electric-potential measurements, which are essentially away-from-the-well… more

Date: January 1, 1983

Creator: Engi, D

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of an Advanced Hydraulic Fracture Mapping System

The project to develop an advanced hydraulic fracture mapping system consisted of both hardware and analysis components in an effort to build, field, and analyze combined data from tiltmeter and microseismic arrays. The hardware sections of the project included: (1) the building of new tiltmeter housings with feedthroughs for use in conjunction with a microseismic array, (2) the development of a means to use separate telemetry systems for the tilt and microseismic arrays, and (3) the selection … more

Date: January 31, 2007

Creator: Warpinski, Norm; Wolhart, Steve; Griffin, Larry & Davis, Eric

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Radioactive tracers used to characterize geothermal reservoirs

Data obtained from Br/sup 82/ tracer injections with downhole gamma ray monitoring were used to quantify flow fractions entering and leaving the GT-2B and EE-1 reservoirs at various depths. The Br/sup 82/ tracer method also provided data needed to characterize changes in the reservoir volume and flow distribution within fracture system during the recent 281 day sustained heat extraction experiment at the Hot Dry Rock Fenton Hill Site.

Date: January 1, 1981

Creator: Dennis, B.R.; Potter, R. & Kolar, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

An efficient, three dimensional, fully-coupled hydro-thermo- mechanical simulator

Hydro-thermo-mechanical effects in fractured rocks are important in many oilfield processes. Modeling these effects is made difficult by the fact that the governing equations are nonlinear and coupled, and the problems to be solved are three dimensional. In this paper the authors describe a numerical code developed for this purpose. The code is finite element based to allow for complicated geometries, and the time differencing is implicit, allowing for large time steps. The use of state-of-the-… more

Date: January 1, 1990

Creator: Kelkar, S. & Zyvoloski, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mining earth's heat: development of hot-dry-rock geothermal reservoirs

The energy-extraction concept of the Hot Dry Rock (HDR) Geothermal Program, as initially developed by the Los Alamos National Laboratory, is to mine this heat by creating a man-made reservoir in low-permeability, hot basement rock. This concept has been successfully proven at Fenton Hill in northern New Mexico by drilling two holes to a depth of approximately 3 km (10,000 ft) and a bottom temperature of 200/sup 0/C (392/sup 0/F), then connecting the boreholes with a large-diametervertical hydra… more

Date: January 1, 1983

Creator: Pettitt, R. A. & Becker, N. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Detection of a thin sheet magnetic anomaly by squid-gradiometer systems: possibility of hydrofracture azimuth determination

A study of the signal physics of magnetic anomaly detection was carried out by superconducting gradiometer and magnetometer loop systems with SQUID sensors for possible application to the LASL geothermal energy program. In particular, the crack produced by hydrofracture of a deep HDR geothermal borehole would be filled with a magnetic material such as ferrofluid. When polarized by the earth's field, this material would produce a localized crack magnetic anomaly which is characteristic of the az… more

Date: December 1, 1978

Creator: Overton, W.C. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Cumulative experience of the US Hot Dry Rock Program

In over 20 years of research on the Hot Dry Rock (HDR) geothermal energy concept at Los Alamos National Laboratory, no obstacle has yet been found that would prevent its development as a major new energy source for the nation. To put the continuing development of the HDR concept in perspective, the most appropriate comparison is with fusion energy, the only other nonrenewable energy resource of the magnitude of HDR geothermal energy. In this context, research on fusion energy is currently so fa… more

Date: January 1, 1993

Creator: Brown, D. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Application of characteristic time concepts for hydraulic fracture configuration design, control, and optimization

The analysis of pertinent energy components or affiliated characteristic times for hydraulic stimulation processes serves as an effective tool for fracture configuration designs optimization, and control. This evaluation, in conjunction with parametric sensitivity studies, provides a rational base for quantifying dominant process mechanisms and the roles of specified reservoir properties relative to controllable hydraulic fracture variables for a wide spectrum of treatment scenarios. Results ar… more

Date: October 1, 1992

Creator: Advani, S. H.; Lee, T. S. & Moon, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Cumulative experience of the US Hot Dry Rock Program

Date: April 1, 1993

Creator: Brown, D. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Subtask 2.2 - Creating A Numerical Technique for Microseismic Data Inversion

Geomechanical and geophysical monitoring are the techniques which can complement each other and provide enhancement in the solutions of many problems of geotechnical engineering. One of the most promising geophysical techniques is passive seismic monitoring. The essence of the technique is recording the acoustic signals produced in the subsurface, either naturally or in response to human activity. The acoustic signals are produced by mechanical displacements on the contacts of structural elemen… more

Date: May 1, 2009

Creator: Dobroskok, Anastasia; Holubnyak, Yevhen & Sorensen, James

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Introduction to the GRI/DOE Field Fracturing Multi-Site Project

The objective of the Field Fracturing Multi-Sites Project is to conduct field experiments and analyze data that will result in definitive determinations of hydraulic fracture dimensions using remote well and treatment well diagnostic techniques. In addition, experiments will be conducted to provide data that will resolve significant unknowns with regard to hydraulic fracture modeling, fracture fluid rheology and fracture treatment design. These experiments will be supported by a well-characteri… more

Date: December 31, 1993

Creator: Peterson, R. E.; Middlebrook, M. L.; Warpinski, N. R.; Cleary, M. P. & Branagan, P. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Enhanced Geothermal Systems (EGS) R&D Program

The purpose of this workshop was to develop technical background facts necessary for planning continued research and development of Enhanced Geothermal Systems (EGS). EGS are geothermal reservoirs that require improvement of their permeability or fluid contents in order to achieve economic energy production. The initial focus of this R&D program is devising and testing means to extract additional economic energy from marginal volumes of hydrothermal reservoirs that are already producing com… more

Date: August 18, 1999

Creator: Entingh, Daniel J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fracture Dissolution of Carbonate Rock: An Innovative Process for Gas Storage

The goal of the project is to develop and assess the feasibility and economic viability of an innovative concept that may lead to commercialization of new gas-storage capacity near major markets. The investigation involves a new approach to developing underground gas storage in carbonate rock, which is present near major markets in many areas of the United States. Because of the lack of conventional gas storage and the projected growth in demand for storage capacity, many of these areas are lik… more

Date: October 31, 2006

Creator: Castle, James W.; Falta, Ronald W.; Bruce, David; Murdoch, Larry; Brame, Scott E. & Brooks, Donald

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Economic Implementation and Optimization of Secondary Oil Recovery

The St Mary West Barker Sand Unit (SMWBSU or Unit) located in Lafayette County, Arkansas was unitized for secondary recovery operations in 2002 followed by installation of a pilot injection system in the fall of 2003. A second downdip water injection well was added to the pilot project in 2005 and 450,000 barrels of saltwater has been injected into the reservoir sand to date. Daily injection rates have been improved over initial volumes by hydraulic fracture stimulation of the reservoir sand in… more

Date: January 9, 2006

Creator: Brock, Cary D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Review of the Geothermal Reservoir Well Stimulation Program

Republic Geothermal, Inc., and its subcontractors have planned and executed four experimental fracture stimulation treatments under the Department of Energy-funded Geothermal Reservoir Well Stimulation Program (GRWSP). The 2-year program, begun in February 1979, is Ultimately to include six full-scale field hydraulic and chemical stimulation experiments in geothermal wells. This paper describes the overall program and the four treatments completed to date. The GRWSP is organized into two phases… more

Date: January 1, 1981

Creator: Campbell, D. A.; Hanold, R. J.; Sinclair, A. R. & Vetter, O. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation of Oil-Industry Stimulation Practices for Engineered Geothermal Systems

Geothermal energy extraction is typically achieved by use of long open-hole intervals in an attempt to connect the well with the greatest possible rock mass. This presents a problem for the development of Enhanced (Engineered) Geothermal Systems (EGS), owing to the challenge of obtaining uniform stimulation throughout the open-hole interval. Fluids are often injected in only a fraction of that interval, reducing heat transfer efficiency and increasing energy cost. Pinnacle Technologies, Inc. an… more

Date: October 17, 2007

Creator: Dyke, Peter Van; Weijers, Leen; Robertson-Tait, Ann; Warpinski, Norm; Mayerhofer, Mike; Minner, Bill et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Advanced Hydraulic Fracturing Technology for Unconventional Tight Gas Reservoirs

The objectives of this project are to develop and test new techniques for creating extensive, conductive hydraulic fractures in unconventional tight gas reservoirs by statistically assessing the productivity achieved in hundreds of field treatments with a variety of current fracturing practices ranging from 'water fracs' to conventional gel fracture treatments; by laboratory measurements of the conductivity created with high rate proppant fracturing using an entirely new conductivity test - the… more

Date: June 19, 2007

Creator: Holditch, Stephen; Hill, A. Daniel & Zhu, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department