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۱A Detailed Modeling for Enhanced Fluid Percolation in Fractured Porous Media by Application of Low_ Frequency Elastic Waves: An Extension of Previous Models to Fractured Reservoirs
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Application of elastic vibration technologies in fluid flow through porous media is outspreading day after day, but lack of knowledge about the governing mechanisms is the Achilles heel of this technology. During past few years, models for predicting the flow behavior under radiation of elastic waves have been presented for granular porous media by geosciences Researchers. But till now, no mathematical model is presented to be applied in fractured media. This will be more noticeable when we bear in mind that several reservoirs in Middle East region are fractured. In this work the current model applied on granular medium is extended to fractured systems, and the effects of elastic waves on capillary trapping and mobility of Bingham plastic fluids in fractures have been investigated. Eventually, a model for predicting the influence range of the wave in fractured reservoirs is presented. Oil is considered as Bingham plastic and water as Newtonian fluid. The Gravitational forces are assumed to be negligible and the wave range of frequency is considered below the critical frequency in fractured reservoirs, 100 Hz. So, the time derivation in modeling of wave propagation could be neglected. The results of this study clarified that radiation of wave with low frequency and intensity extremely increases the flow rate and decreases the minimum pressure gradient required for flow of Bingham plastic fluids in fractured porous media. In addition, the fractional flow of Bingham plastic fluid is increased dramatically.<\div>

۲Ultrasonic Waves Effect on Removing Skin from Near Wellbore Region: A Modeling and Experimental Approach
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۷
Although the concept of high frequency acoustic waves, for improving production from oil wells have been applied from many years ago but yet the mechanisms related to this method are not well understood. Nowadays, ultrasonic waves are applied to remove skins formed near wellbore due to asphaltene deposition and fine particles. Despite the fact that there is no document about ultrasonic wave effect on removing gas condensate in field scale studies, but it seems that this method can be used for solving this problem as well. Different mechanisms can govern these removalprocesses through porous media in the presence of ultrasonic field. In this paper at the first part we are going to study the effects of ultrasonic wave irradiation on relative production increase by removing phase trap induced skin due to gas condensate formation near well bore by reducing interfacial tension. To this aim firstly a mathematical model of wave influence on interface of fluids is proposed then in experimental part a modified pendant drop setup is employed and a wave generator with varying output power, 55 to 100 watts, and a constant frequency of 45 kHz is applied. It is illustrated that how ultrasonic wave’s radiation could change the shape and volume of drops of oil ejecting from capillary tip which is a simplified pore in our experiment. Also it is observed that we have about 10 to 15 percent increases in cumulative production from a capillary tube at the presence of ultrasonic field. At the second part of this paper, based on the trend of viscosity versus time curves under ultrasonic wave field, resolution and scattering of asphaltene aggregates is concluded and it is confirmed by visualization under microscope based on buckley previousworks on asphaltene instability analysis.<\div>

۳Experimental Study of the Effect of Barriers on Heavy Oil Recovery during Hydrocarbon Solvent Injections
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Although most of the heavy oil reservoirs contain discontinuous shaly structures, the effect of shale geometrical characteristics including: spacing from wells, discontinuity, orientation, shale's spacing and length on oil recovery factor in presence of gravity force are not well understood. In this work a series of solvent injection experiments were conducted on various vertical one–quarter five–spot glass micromodels containing barriers that are initially saturated with heavy oil under several fixed flow rate conditions. The oil recovery was measured by analysis of the pictures provided continuously during injection processes. The experimental data were used for developing and validating compositional–numerical model. The results indicated that the ultimate oil recovery in presence of shale was lower than that in homogeneous models. The oil recovery was greatly a function of shaly structure’s orientation and by increasing the barrier exposure with the main flow direction the solvent propagation decreased. The gravity force caused the solvent to be propagated better in the media. Lower distance of these barriers from production well reduced the final oilrecovery, but it acted conversely for the case of the injection well.<\div>
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