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• W299466144 abstract "THE NORTHWEST GEYSERS EGS DEMONSTRATION PROJECT PHASE 1: PRE- STIMULATION COUPLED GEOMECHANICAL MODELING TO GUIDE STIMULATION AND MONITORING PLANS Jonny Rutqvist, Patrick F. Dobson, Curtis M. Oldenburg, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 Julio Garcia, Mark Walters Calpine Corporation, Middletown, California Key words – EGS, Geysers, Injection, geomechanical modeling 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 ~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). INTRODUCTION The overall objective of the Northwest Geysers EGS Demonstration project is to develop and demonstrate the technology required to extract energy from the low permeability zones that typically underlie high-temperature geothermal systems. The proposed EGS concept will be developed and demonstrated in an area of the Northwestern Geysers geothermal field, California, which was originally explored for natural steam production in the 1980s. A high temperature zone (HTZ) with temperature up to 350°C was discovered here at a relatively shallow depth (Walters et al., 1988).A number of steam production wells were drilled, but later abandoned because of uneconomically low natural steam production as well as problems with corrosive non-condensable gases (NCG). The plan is to re-open and re-complete two of the abandoned exploratory wells and possibly deepen them for injection and stimulation in the HTZ. An ample" @default.
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• W299466144 date "2012-09-17" @default.
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• W299466144 title "The Northwest Geysers EGS Demonstration Project Phase 1: Pre-stimulation coupled geomechanical modeling to guide stimulation and monitoring plans" @default.
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