GEOTHERMAL TECHNOLOGIES LEGACY COLLECTION - Bibliographic Citation


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Title: The Northwest Geysers EGS Demonstration Project Phase 1: Pre-stimulation coupled geomechanical modeling to guide stimulation and monitoring plans
Creator/Author: Rutqvist, J. ; Dobson, P.F. ; Oldenburg, C.M. ; Garcia, J. ; Walters, M.
Publication Date:2010 Oct 20
OSTI Identifier:OSTI 1050699
Report Number(s):LBNL-4876E
DOE Contract Number:DE-AC02-05CH11231
Document Type:Conference
Specific Type:
Coverage:
Resource Relation:Conference: Geothermal Research Council Annual Meeting, Sacramento, California,, October 24?27, 2010; Related Information: Journal Publication Date: 2010
Other Number(s):
Research Org:Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:Earth Sciences Division
Subject:15 GEOTHERMAL ENERGY; 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; CALIFORNIA; GEOTHERMAL FIELDS; GEOTHERMAL SYSTEMS; GEYSERS; INJECTION WELLS; MONITORING; PERMEABILITY; PRODUCTION; SIMULATION; STEAM; STIMULATION; WATER
Keywords:
Description/Abstract:This paper presents activities and results associated with Phase 1 (pre-stimulation phase) of an Enhanced Geothermal System (EGS) demonstration project at the northwest part of The Geysers geothermal field, California. The paper presents development of a 3-D geological model, coupled thermal-hydraulic-mechanical (THM) modeling of proposed stimulation injection as well as current plans for stimulation and monitoring of the site. The project aims at creating an EGS by directly and systematically injecting cool water at relatively low pressure into a known High Temperature (about 280 to 350 C) Zone (HTZ) located under the conventional (240 C) steam reservoir at depths of {approx}3 km. Accurate micro-earthquake monitoring initiated before the start of the injection will be used as a tool for tracking the development of the EGS and monitoring changes in microseismicity. We first analyzed historic injection and micro-earthquake data from an injection well (Aidlin 11) located about 3 miles to the west of the new EGS demonstration area. Thereafter, we used the same modeling approach to predict the likely extent of the zone of enhanced permeability for a proposed initial injection in two wells (Prati State 31 and Prati 32) at the new EGS demonstration area. Our modeling indicates that the proposed injection scheme will provide additional steam production in the area by creating a zone of permeability enhancement extending about 0.5 km from each injection well which will connect to the overlying conventional steam reservoir, in agreement with the conclusions of Nielson and Moore (2000).
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Country of Publication:US
Language:English
Size/Format:Medium: ED; Size: 22
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System Entry Date:2012 Dec 05
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