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pseudo-steady-state-condition
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Estimating the properties of naturally fractured reservoirs using rate transient decline curve analysis
, Article Journal of Earth Science ; Volume 28, Issue 5 , 2017 , Pages 848-856 ; 1674487X (ISSN) ; Joukar, M ; Fathinasab, M ; Da Prat, G ; Kharrat, R ; Sharif University of Technology
Abstract
Transient rate decline curve analysis for constant pressure production is presented in this paper for a naturally fractured reservoir. This approach is based on exponential and constant bottom-hole pressure solution. Based on this method, when ln (flow rate) is plotted versus time, two straight lines are obtained which can be used for estimating different parameters of a naturally fractured reservoir. Parameters such as storage capacity ratio (ω), reservoir drainage area (A), reservoir shape factor (CA), fracture permeability (kf), interporosity flow parameter (λ) and the other parameters can be determined by this approach. The equations are based on a model originally presented by Warren...
Ethylbenzene dehydrogenation to styrene over fresh and used commercial catalysts
, Article AIChE Annual Meeting, Conference Proceedings ; 2011 ; 9780816910670 (ISBN) ; Ebrahimpour, O ; Sharif University of Technology
2011
Abstract
Dehydrogenation of ethylbenzene (EB) to produce styrene (ST) monomer is commercially performed over potassium-promoted iron oxide catalysts. Catalyst deactivation due to coke deposition and loss of potassium is a major operation and economic drawback in this process. To better evaluate the performance change of these catalysts over their life-cycle, dehydrogenation of EB to ST over the fresh and used commercial catalysts was experimentally investigated at temperatures from 590 to 639°C under atmospheric pressure. The fresh and the used catalysts were obtained from a styrene plant. The used catalyst had been continuously operated for two years under severe plant conditions. The catalyst...