توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱The Role of Wettability in Gas–Assisted Gravity Drainage Process
نویسنده(ها): ، ،
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
This paper pertains to experimental study of wettability effect in oil recovery under Gas Assisted Gravity Drainage process. The experiments are performed on long unconsolidated porous media and sensitivity analyses are done for wettability and gas injection rate. Two set of experiments also are extended by subsequent water flooding after gas breakthrough time to decrease the oil recovery duration. The experiments are simulated and relative permeability curves are evaluated by history matching. Two flow regimes are observed during oil recovery. In the early stage oil produces under bulk flow which is affect by viscous force and injection rate while wettability has a weak influence. For the next stage film flow takes place through porous media leading to very slow rate. In this stage higher oil recovery is observed in water wet media due to flow of oil by spreading film, however it vanishes abruptly compared to oil wet media. In oil wet media, oil remains continuous through wetting film but it is subjected to strong capillary retention. Moreover only
in water wet media subsequent water flooding by generation of oil bank and displacing of residual oil leads to considerable recovery.<\div>

۲The Effect of Gas Mobility and Injection Rate on the Oil Recovery under Forced Gravity Drainage Mechanism
نویسنده(ها): ، ، ،
اطلاعات انتشار: دومین کنگره مهندسی نفت ایران، سال
تعداد صفحات: ۱۰
The Gas Assisted Gravity Drainage (GAGD) process was developed as an alternative to the currently popular water–alternating–gas process. Multiphase mechanisms and fluid dynamics operational have been found to be important, to facilitate forecasting of the reservoir behavior and oil recovery characteristics. Therefore, it is important to have good knowledge of dominant forces (viscous, capillary and gravity) during the production life.By considering of three chief forces in oil recovery process, the mathematical formulation takes the form of a nonlinear convection–diffusion equation. Thus, a numerical model based on the finite–difference formulation was implemented to obtain the solution of this equation and it can be used to simulate more complex two–phase flow problems. In the GAGD process, the flow regimes will be varied by changing the gas injection rate. In this circumstance, the gravity drainage assumptions should be verified when the process moves from the gravity–capillary dominant regime to the capillary–viscous dominant regime. Since, ignoring gas mobility is the most popular assumption in gravity drainage process; in such a forced gravity drainage GAGD process, this assumption may not be valid.In this paper, sensitivity analysis on gas mobility and gas injection rate in gas gravity drainage was done around the critical rate that mechanistically represents the maximum injection rate at which the gravity forces are dominant. The results show when the gas velocity is less than the gravity–stabilized rate, gas mobility may still be assumed infinite. In addition, when the gravity force is overcome by the increased magnitude of viscous forces (gas injection rate) the alteration of gas mobility could highly influence on oil recovery<\div>
نمایش نتایج ۱ تا ۲ از میان ۲ نتیجه