توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Ultrasonic 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>

۲Parametric Investigation of WAG Injection Process in Naturally Fractured Reservoirs
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۸
The WAG injection projects are categorized as a successful group of EOR processes as indicated by field statistics all over the world. However, according to the economical aspects, fluid properties and also the complexity of the reservoir rock, the operating parameters of WAG in fractured reservoirs should be controlled to obtain economic rates and recoveries. This study addresses a parametric study of the WAG process and its performance on a fractured model. The purpose of this study is to investigate the efficiency of the WAG process compared with water and gas injection using a commercial reservoir simulator. The simulation studies are run on a synthetic fractured model with real PVT data of the reservoir fluid in order to perform a qualitative study of the parameters which are crucial for a WAG process design. These parameters are then sum up to find the best scenario of production from the real reservoir. The fluid injection scenarios are defined as water, gas and WAG injection and their performance in terms of oil recovery factor, production GOR and reservoir pressure are compared with each other. Both gas and WAG injection processes are run in immiscible conditions. Based on the results of this study it is shown that the WAG injection process can be optimized inorder to have more efficiency than either water or gas injection alone. In addition to lower costs, the production conditions are more desirable.<\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>
نمایش نتایج ۱ تا ۳ از میان ۳ نتیجه