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      저자 : Khosrow Jarrahian (검색결과 2 건)
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        An experimental study of the performance of low-molecular weight polymer for enhanced heavy oil recovery in a heterogeneous media

        Hossein Ghahremani,Sina Mobaraki,Seyyed Shahram Khalilinezhad,Khosrow Jarrahian 한국자원공학회 2018 Geosystem engineering Vol.21 No.2

        The goal of enhanced oil recovery is to improve sweep efficiency in the reservoir by the injection of artificial materials in order to reduce the trapped oil saturation. In this study, the application of an anionic polyacrylamide polymer was investigated for heavy oil recovery based on the results of rheological measurements and oil recovery experiments. The properties of the polymer solution were interpreted by the use of well-known rheological models and oil recovery experiments were performed using a heterogeneous two-dimensional glass micromodel saturated with heavy oil of 270 cP. To provide a better understanding of the microscopic efficiency of the process, analysis of continuously provided pictures during the experiments by the use of image processing technique was performed. Rheological results combined with microscopic observations revealed that the non-Newtonian behavior of the solution enhances the sweep efficiency of the both pore throats and pore bodies. Macroscopic observations showed the ultimate oil recovery of 56% and dramatic improvement in breakthrough time during polymer flood in comparison to water flood. In addition, the microscopic pictures disclosed that the pulling effect and stripping mechanisms are responsible mechanisms for the high microscopic sweep efficiency during polymer flooding.

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        Preparation and investigation of the physical and chemical properties of clay-based polyacrylamide/Cr (III) hydrogels as a water shut-off agent in oil reservoirs

        Farhad Salimi,Mohsen Vafaie Sefti,Khosrow Jarrahian,Majid Rafipoor,Seyyed Saeed Ghorashi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6

        The effects of clay (montmorillonite and kaolinite) in the hydrogels were investigated on various propertiessuch as syneresis and strength of thermal and salinity situations in one of the southern Iranian oil reservoirs. The X-raydiffraction (XRD) patterns exhibited a significant increase in interplanar spacing between the montmorillonite claylayers, varying from the initial value of 12.43 oA to 19.45 oA, which evidences the intercalation formation. It was revealedthat even increasing of the interlayer spacing due to kaolinite modification had no effect on the clay compositions. Formationwater was used to study the strength of the hydrogel in the presence of ions. The results indicated that 15 wt%increase of kaolinite clay (modified and non-modified) leads to 20% decrease of the hydrogels’ syneresis. The diffusionof polymer chains between the clay layers increased the elastic modulus (G') of the prepared hydrogels with modifiedkaolinite and montmorillonite, where the maximum value of G' was observed in 3 wt% of montmorillonite. Finally,the thermogravimetric analysis (TGA) indicated an increase in the thermal stability of the mentioned hydrogels.

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