توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Experimental calculation of permeability reduction of porous medium by asphaltene precipitation in crude oil systems
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
In this work, we prepared the data of the permeability reduction by asphaltene precipitation in porous medium and precipitation and re–dissolution of asphaltenes were studied for an Iranian relatively heavy crude oil system. A series of experiments were designed and carried out to quantitatively obtain the permeability reduction in slim tube porous media and examine the amount and reversibility of asphaltenes precipitation upon the change in the solvent concentration along with the temperature. Experiments were conducted in both porous and non–porous media. As a porous medium, a slim tube apparatus was used which is a one– dimensional model reservoir. Generally, with these experiments obtained the amount of permeability reduction in porous medium and also showed that the precipitation is completely reversible for oil under study upon both composition and temperature changes. n–Heptane was used as the precipitant, and a temperature range of 30 to 70°C was applied to perform the temperature effect tests.<\div>

۲Experimental Calculation of Asphaltene Critical Properties in Crude Oil Reservoir Systems
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
High molecular weight (HMW) hydrocarbons (>C40) and asphaltenes are important constituents of petroleum and can cause problems related to crystallization and deposition of asphaltene. In this paper introduces an extension of cubic equation of state (Peng–
Robinson EOS) to describe asphaltene–toluene mixture vapor–liquid equilibria (VLE) and characterize the pure asphaltene and the critical properties of asphaltene are adjusted (table (4)). Our experimental data (table (1)) in this study were used to examine the proposed procedure measured from the Iranian crude oil reservoir. We determined the critical properties of asphaltene for this EOS with using the two phase vapor–liquid equilibrium calculation. The test results showed that the proposed procedure is adequate for predicting the asphaltene precipitation data measured.<\div>

۳Continuous Thermodynamics Modeling of Asphaltene Precipitation as Associating System in Crude Oil Mixture
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
In this work, a new and efficient algorithm for asphaltene deposition modeling through application of association thermodynamic model is introduced. We assume that have a binary system, non–precipitating as crude oil solvent system and precipitating as asphaltene component which pure asphaltene component only participate in deposition phase. For characterization of asphaltenes, used asphaltene segment distribution function and The association term is applied at equilibrium condition and a necessary and sufficient condition is defined to minimize the Gibbs free energy relation and also equality of the fugacity of each liquid and solid phases. Also we used two phase flash calculations with Peng–Robinson and Lee–Kesler EOS for the live and tank crude oil systems to describe asphaltene (association) – crude oil solvent (non–association) mixture which the association parameters of asphaltene component are adjusted with our experimental data at different conditions. Our experimental data from the Iranian crude oil reservoir, in this study were used to examine the proposed asphaltene model. It has been shown that the calculated results are in good agreement with experimental
data.<\div>

۴Investigation of Formation damage Based to Additions of Oil Based Mud; Laboratory Study
اطلاعات انتشار: چهاردهمین همایش بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۱۲
atrotary drilling generally we use two kind of drilling fluid ; water based mud (WBM), OIL based mud (OBM) . Continuous phase at OBM is a kind of liquid hydrocarbon that in iran uses gas Oil no.2(diesel no.2) as continuous phase. In OBM there is more advantage than WBM , but high initial cost & pollution of this mud, cause that we don't use OBM sometime. formation damage is a big challenge in reservoir & production that exists by various methods , one of them is drilling fluids . we must investigate the chemical & mineral mud additions until decrease skin effect. at this paper we used investigation with laboratory studies and laboratories design of OBM , then investigated the effect of each addition. the result showed OBM changed the wettability which existed the sizeable effect on the reservoir. at the end we used the composition of the additions which have minimized skin effect.<\div>

۵Experimental Investigation for Simulating High Power Laser Perforation under Pressure
اطلاعات انتشار: سومین کنگره ملی مهندسی نفت، سال
تعداد صفحات: ۷
Procedure: Initial tests were performed on cores of Berea sandstone and limestone under various conditions of axial, pore and confining pressures. For all cases, the laser settings remained the same.Full output power of 3.5 kW was applied continuously to each sample through the sapphire window of the pressure cell with a focused beamdiameter of 0.889 cm (0.35 in)over 8.0 s. The amount of laser exposure time was calculated from previous laser rock interactions to allow penetration into the core without risk of penetrating the core’s full length and avoiding possible damage to the pressure cell.<\div>
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