توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱The Effect of Surface Modification on Stability of Bentonite Nanoclay particles in polyelectrolyte suspension
نویسنده(ها): ، ، ،
اطلاعات انتشار: چهاردهمین همایش بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۹
To investigat the stability of nanoclay particles in colloidal suspensions in high salt concentration based oil formation water TDS~130\000–260\000mg\lit is the main goal of this paper these colloids are sued in oil industries such as drilling fluids , water treatment and oil production. in aqueous suspension most clay particles aggregate and specially settled by increasing salt concentrations. the surface modification of Ca–bentonite nanoclays with water soluble copolymers are used to stabilize these polyelectrolyte suspensions. grafting of functional copolymers to the surface of the nanoclays can improve the interaction and balabce of attractive and repulsive forces between colloidal particles. in this study three types of copolymer are used for grafting and coating onto the nanoclay surfaces. the stability of modified nanoclays in polyelectrolyte suspension containing high salt concentration was determined by UV –photo spectroscopy. amount of grafting percentage was measured by tehrmal gravimetric analyzer and FTIR. maximum grafting ratio and better stability of colloids are obtained by grafting of viny polystyrene copolymer onto nanoclay surface.<\div>

۲Thermodynamic Investigation of the Stability of Copolymer Grafted Bentonite Nanoclays in an High Salinity Electrolyte
نویسنده(ها): ، ، ،
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۵
Stability of clays is one of the most important characteristics of these colloidal systems and its degree can be determined by the balance of attractive and repulsive forces acting between the colloidal particles. In this work, the stability of grafted bentonite nanoclays by different copolymers including poly (1–vinyl pyrrolidone–co–styrene) (PVP), poly(methyl methacrylate –co–methacrylic acid) (PMMA) and poly (acrylamide–co–diallyl dimethyl ammonium chloride) (PDADMAC) in a high salinity polyelectrolyte solution containing partially hydrolyzed polyacrylamide (PHPA) was investigated. Adsorption of PHPA chains onto the modified bentonite–nanoclay surfaces, according to the Langmuir isotherm mechanism, led to the stabilization of the nanoclay particles in the polyelectrolyte medium. The thermodynamic parameters including enthalpy (ΔH), entropy (ΔS), free energy (ΔG) and adsorption constant (Kn) of the interactions of organic–organic–inorganic hybrids in the nano–clay suspensions were determined by Langmuir equation using a spectrophotometer analyzer. The stability and thermodynamic studies indicated that modified PVP–nanoclay had the longest stability among the un–modified and modified nanoclays in the prepared suspensions.<\div>

۳DEVELOPING A COMPUTER SOFTWARE TO ANALYZE RESERVOIR FLUIDS PROPERTIES THROUGH SURFACE SEPARATOR DATA
نویسنده(ها): ، ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۸
There is a sense of an obvious need for the calculations needed to design and simulate the flow pipelines and reservoir–related calculations: Evaluating the reservoir fluids properties as accurate as possible. These properties should be obtained using laboratory based analysis. In the lack of ability to direct laboratory measurements, some empirical correlations are used. During the recent years, several correlations are obtained through laboratory measurements so that they could estimate the properties of oil and gas. These correlations are not such simple and could not be calculated by hand easily. So the best way to apply the correlations and obtain the reservoir fluids properties is to design a computer program, which can be run on a computer itself or programmable scientific calculators. The purpose of this paper is to develop an easy–to–use Matlab–based computer program to analyze the properties of the reservoir fluids through surface separator data. Reviewing the act of the reservoirs it should be noted that surface sampling is performed in the case of single phase reservoir fluid which specifically referred to dry gas, wet gas, retrograde gas which has not reached its dew point and oil which has not reached its bubble point yet. Gas reservoirs are analyzed through black oil and compositional analysis, but crude oil is usually analyzed though black oil analysis. This specification is considered in the program. The first unit for hydrocarbon to enter, production unit, has the ability to provide what is needed for separator recombination which finally outputs the reservoir fluid composition or specific gravity, the two main parameters to be inputted in the previously–said correlations to calculate oil and gas properties. The program to be written will input the reservoir characteristics such as GOR, API and compositions, performs the separator recombination and after calculating reservoir composition or gravity as needed, will produce the reservoir fluid properties using the so–called correlations.<\div>
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