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- W2066181570 abstract "Abstract Steam deliverability of the original 20 wells, supplying steam to PG and E Unit 13 power plant, has undergone annual exponential plant, has undergone annual exponential decline rates of 11.5%, 5%, 9%, 28.6% and 22% during 1980–81, 1983–84, 1985–86, 1987–88 and 1988–89 respectively. High decline rates after 1984 were influenced by the regional effects associated with the installation of new capacity in the adjoining areas totalling 383 MW (net) in 1983–84 and 347 MW (net) in 1985–86. Unit 13 production declined harmonically for the first 6.6 years, nearly exponentially for the next year and hyperbolically to harmonically thereafter. The near exponential decline trend resulted from the combined effect of local and regional pressure drawdowns and an accelerated makeup pressure drawdowns and an accelerated makeup well drilling program. Analysis of the decline rate versus generating capacity suggests that a sustainable 15% annual exponential decline rate (2 NW per month) is achievable if the capacity is held at about 170 NW (net) in the Unit 13–16 wellfield and 830 NW (net) in The East Geysers. This estimate excludes the positive effects of injection seen in late 1989 and 1990. Introduction Flow rate decline, observed at The Geysers, is caused by the pressure drop in the reservoir in response to continuous mass withdrawal from the steam field. These decline rates depend on several factors such as steam withdrawal rate, well spacing, water saturation, reservoir thickness, matrix and fracture permeability, fracture spacing, wellbor scaling and well location with respect to field boundaries and producing areas. Decline curve analyses are widely used at The Geysers to forecast deliverability behavior, makeup well requirements, workover candidate wells, injection effects and recoverable reserves. The theoretical basis of this analysis is presented in Zais and Bodvarsson. Steam production decline at The Geysers has been studied by several authors. Budd developed decline curves for various well spacings by simulating flow conditions within the steam reservoir. These curves indicated that an increase in well density increases the decline rate due to enhanced interference between the wells. P. 375" @default.
- W2066181570 created "2016-06-24" @default.
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- W2066181570 date "1991-03-20" @default.
- W2066181570 modified "2023-10-09" @default.
- W2066181570 title "Reservoir Response to Production: Castle Rock Springs Area, East Geysers, California" @default.
- W2066181570 doi "https://doi.org/10.2118/21790-ms" @default.
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