Collection of 80 Temperature depth logs from a geothermal well field in Long Valley, California. Spreadsheets include temperature at depth and graphs of data. Data courtesy of the US Geological...
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This Geothermal Permitting Guide was created as a reference tool for geothermal stakeholders interested in developing low temperature direct use and/or power production projects. It addresses the...
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PROGRAM HIGHLIGHTS: GEOTHERMAL DRILLING ACTIVITY
In 2008, 32 new high-temperature geothermal wells were drilled in California compared to 12 wells drilled in 2007. Twenty- two of these wells were...
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This paper presents an analysis of the well productivity enhancement possible by drilling multi-legged (or “forked” or “multilateral”) wells in geothermal fields at temperatures in the 100 to 250°C...
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To prioritize information for archiving and to determine the
applicability of the Fenton Hill experience to the future
development of Enhanced Geothermal Systems (EGS), an
integrated review was...
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In planning the development of a geothermal field, there is a
trade-off between plant capacity and the cost of make-up
drilling. A larger plant benefits from economies of scale in
the construction...
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For the purposes of this paper, sustainability is defined as
the ability to economically maintain the installed capacity,
over the amortized life of a power plant, by taking practical
steps (such...
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As part of the Desert Peak EGS project, tracer testing was
conducted involving two existing injection wells at the Desert
Peak geothermal field. The tracer data showed very strong returns
from...
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The publicly available database on oil and gas fields in California
provides a significant and consistent source of information which
can be used to evaluate geopressure. A total of 410 pools have...
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Some proponents of geothermal energy have described
this energy source as renewable, but many geothermal fields
show declines in output as exploitation proceeds. On the
other hand, those who would...
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Formal booking of geothermal energy reserves, for accounting
purposes or annual reporting to shareholders or
portfolio management, is not yet a common practice among
geothermal companies. In the...
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Geothermal assessments and cost estimates were performed
as part of California’s Renewable Energy Transmission Initiative
(RETI) to help guide transmission planning. The RETI assessments...
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This paper presents the initial results of a survey of the
occurrence and characteristics of geopressured fluid
resources in California using the publicly-available database
involving more than...
Resource Identifiers: SGP-TR-145
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The purposes of this paper are to review the
stratigraphic and structural models which have
been developed for The Geysers from surface
mapping, propose a model which is the most
compatible with...
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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...
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The Geysers geothermal field is the largest developed geothermal
system in the world. The total installed capacity is presently
2,056 MW although actual production in early 1994 was
estimated to...
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The potentially exploitable geothermal energy reserves associated with an active or dormant volcano can be estimated using a methodology that combines principles of conductive heat transfer and...
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Existing geologic models of geothermal systems work reasonably
well for the exploration of systems clearly associated with
active, or recently active, volcanic centers. The poor results of...
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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...
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This paper presents the initial results of a survey of the
occurrence and characteristics of geopressured fluid
resources in California using the publicly-available database
involving more than...
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