numerical simulation

Review of the State-Of-The-Art of Numerical Simulation of Enhanced Geothermal Systems

Basic Information
Author: 
Sanyal, S.K.
Author: 
Butler, S.J.
Author: 
Swenson, D.
Author: 
Hardeman, B.
Description: 
Under the premise that the behavior of enhanced geothermal systems (EGS) will be dominated by fracture flow, this paper reviews the special features that would be required of any practical numerical simulator for EGS. These features, required in addition to the basic features of conventional geothermal simulators, namely, the ability to handle two-phase fluid flow, heat transfer and tracer transp0l1 in porous and fractured media, are: explicit representation of fractures, change in fracture aperture due to effective stress and shear, thermo-elastic effects, relation between fracture aperture and conductivity, and channeling of fluid flow within fractures. Chemical reaction between water and rock and coupling of the reservoir model with a well bore model would also be desirable features.
Publication Date: 
Monday, January 1, 2001
Resource Language: 
English
Intelectual Originator Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Resource Information
Access Statement: 
Abstract available online at http://www.geothermex.com/files/Sanyal_2000-7.pdf For a copy of this paper please e-mail us at mw@geothermex.com
Resource Distribution Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Geographic Extent
North bounding latitude: 
38.7737
South bounding latitude: 
35.4096
West bounding longitude: 
-122.52
East bounding longitude: 
-117.422
Previous Citation
Bibliographic Citation: 
Sanyal, S.K., Butler, S.J., Swenson, D., and Hardeman, B., 2001. Review of the State-Of-The-Art of Numerical Simulation of Enhanced Geothermal Systems. GeothermEx, Inc.,Richmond, California. Thunderhead Engineering Consultants, Inc., Manhattan, Kansas

An Analysis of Power Generation Prospects from Enhanced Geothermal Systems

Basic Information
Author: 
Sanyal, S.K.
Author: 
Butler, S.J.
Description: 
This paper presents an analysis of power generation prospects from Enhanced Geothermal Systems (EGS), specifically, reservoirs with subcommercial permeability enhanced by hydraulic stimulation. EGS is also known as “hot dry rock” or “hot fractured rock” systems. The performance under consideration here is the net electrical power delivered as a function of time over the 20-to-30 year life of a power plant. Although the parameters in this exercise generally reflect conditions encountered at the Desert Peak EGS project in the State of Nevada, United States, the conclusions are applicable, at least qualitatively, to any EGS project.
Publication Date: 
Saturday, January 1, 2005
Resource Language: 
English
Intelectual Originator Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Resource Information
Access Statement: 
Abstract available online at http://www.geothermex.com/files/Sanyal_2005-2.pdf For a copy of this paper please e-mail us at mw@geothermex.com
Resource Distribution Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Geographic Extent
North bounding latitude: 
41.7245
South bounding latitude: 
34.1099
West bounding longitude: 
-124.805
East bounding longitude: 
-115.84
Previous Citation
Bibliographic Citation: 
Subir K. Sanyal and Steven J. Butle, 2005. An Analysis of Power Generation Prospects from Enhanced Geothermal Systems. GeothermEx, Inc., Richmond, California.

A Numerical Simulation Study of the Performance of Enhanced Geothermal Systems

Basic Information
Author: 
Butler, S. J.
Author: 
Sanyal, S.K.
Author: 
Robertson-Tait, Ann
Description: 
This paper presents the results of a numerical simulation study of the performance of Enhanced Geothermal Systems (EGS), specifically, reservoirs with subcommercial permeability enhanced by hydraulic stimulation. The performance under consideration here is the net electrical power delivered as a function of time and the parameters in this exercise reflect conditions encountered at the Desert Peak EGS project in Nevada.
Publication Date: 
Thursday, January 1, 2004
Resource Language: 
English
Intelectual Originator Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Resource Information
Access Statement: 
Available online as a PDF document from GeothermEx at website http://www.geothermex.com/publications.php. For a copy of this paper please e-mail mw@geothermex.com
Resource Distribution Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Geographic Extent
North bounding latitude: 
42.2716
South bounding latitude: 
36.8207
West bounding longitude: 
-122.937
East bounding longitude: 
-116.785
Previous Citation
Bibliographic Citation: 
Butler, Steven, Sanyal, Subir K. and Robertson-Tait, Ann, 2002. A NUMERICAL SIMULATION STUDY OF THE PERFORMANCE OF ENHANCED GEOTHERMAL SYSTEMS . GeothermEx, Inc.,Richmond, California.

A Feasibility Study of the Potential Benefits of low-Rate Water Injection In Superheated Steam Production Wells

Basic Information
Author: 
Butler, S.J.
Author: 
Sanyal, S.K.
Author: 
Henneberger, R.C.
Author: 
Goyal, K.P.
Author: 
Box Jr., W.T.
Description: 
This paper investigates the technical feasibility of improving the productivity of superheated steam production wells by low-rate water injection downhole. A combined numerical simulation model of the reservoir and well bore was developed to analyze the physical and thermodynamic processes associated with such downhole injection. The model consisted of a geometrically- increasing radial grid with 12 horizontal layers, the vertical stack of the central grid blocks representing the well bore. The model was calibrated against the temperature and pressure profiles from two flowing wells at The Geysers steam field in California. The modeling of low-rate downhole injection (through a tubing) so far indicates that up to a third of a megawatt (MW) of additional power can be easily gained by injection at 7,500 feet (ft) in a superheated steam well. Of this additional steam, about half results from de-superheating of steam and the rest from extraction of heat from the formation surrounding the well bore. In addition to increasing the power capacity, downhole injection allows neutralization of acidic steam through the addition of caustic soda to the injection water, scrubbing of chloride, and dilution of the non-condensable gases in the produced steam.
Publication Date: 
Sunday, September 22, 2002
Resource Language: 
English
Intelectual Originator Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Resource Information
Resource Distribution Contact
Organization Name: 
GeothermEx, Inc.
Street Address: 
3260 Blume Drive,Suite 220
City: 
Richmond
State/Province: 
CA
Postal Code: 
94806
Country: 
United States
Phone: 
510-527-9876
Fax: 
510-527-8164
Geographic Extent
North bounding latitude: 
42.2472
South bounding latitude: 
31.8989
West bounding longitude: 
-124.98
East bounding longitude: 
-113.379
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