Title:

Estimating Water Saturation at The Geysers Based on Historical Pressure/Temperature Production Data

Authors:

Jericho L. P. Reyes and Roland N. Horne

Key Words:

water saturation, The Geysers

Geo Location:

The Geysers, California

Conference:

Stanford Geothermal Workshop

Year:

2003

Session:

Reservoir Studies

Language:

English

Paper Number:

28001

File Size:

215KB

View File:

Abstract:

Available historical data from 503 wells at the Geysers geothermal field were analyzed to estimate in-situ water saturation in the reservoir. The pressure and temperature performance data of most of the wells demonstrate "dry-out" due to the formation of superheated steam. The in-situ water saturation of the reservoir can be inferred by using zero-dimensional models derived from mass and energy conservation equations. Techniques to identify the initial reservoir temperature and the dry-out temperature were developed and used in the saturation calculations. Effects of reinjection of the Geysers were analyzed and compared to models of depleted reservoirs. Regional trends of the saturation values plotted in the Cartesian plane were also investigated.


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Abstract:

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