Northern Geysers Steam Field

Chemical Transients During Production of High Gas Wells at the Northern Geysers Steam Field, California, USA

Basic Information
Author: 
Klein, C.W.
Author: 
Chase, D.
Description: 
Non-condensible gas and stable isotope data from the extreme northwest end of The Geysers steam field indicate that this part of the reservoir consists of a deeper zone, below about -8,000 feet msl, where gas concentrations arc as high as 100,000 ppm-wt, and a shallower zone with steam containing 15,000 ppm-wt gases, generally conforming to stratification of the reservoir previously reported from a production area several miles to the cast. Production wells may tap the shallow zone, the deep zone, or both, depending upon the positions of their production zones with respect to the interface. In addition to high gas content, the deeper zone is characterized by anomalously high temperatures, heavy isotopes of oxygen (and pcrhaps hydrogen) in the steam, and high total carbon in the gases. Shifts of gas composition during production can be interpreted in terms of dilution of steam in the shallow zone by boiling of reservoir liquid, and mixing between deep and shallow steam. Reservoir steam saturation after 1-1/2 years of production is caleulated to be about 0.3 in the shallow zone, and about 0.9 in the deep zone. There is some problem with saturation caleulations which involve the concentration of hydrogen, which yields deep zone saturation values as high as 2.5, which is impossible. This is discussed in relation to the possible presence of "excess" hydrogen in the steam.
Publication Date: 
Sunday, January 1, 1995
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/Klein_1995-1.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
Phone: 
United States
Fax: 
510-527-8164
Geographic Extent
North bounding latitude: 
42.1169
South bounding latitude: 
33.8183
West bounding longitude: 
-124.277
East bounding longitude: 
-114.609
Previous Citation
Bibliographic Citation: 
Klein, C. W., and Chase, D, 1995.Chemical Transients During Production of High Gas Wells at the Northern Geysers Steam Field, California, USA. Geothermal Energy Partners, Ltd., Irvine, California.
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