Research Paper
Petroleum Engineering – Exploration
Alireza Kordzangeneh; Bahram Habibnia; Majid Akbari
Abstract
Permeability is one of the most significant petrophysical parameters of reservoir rock and its accurate, inexpensive, and rapid estimation is important. One of the methods for the estimation of permeability is the Stoneley flow zone index method. In this study, this method was used to estimate the permeability. ...
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Permeability is one of the most significant petrophysical parameters of reservoir rock and its accurate, inexpensive, and rapid estimation is important. One of the methods for the estimation of permeability is the Stoneley flow zone index method. In this study, this method was used to estimate the permeability. For this purpose, after processing the Stoneley waves in the studied well by Geolog software, the permeability index was calculated based on Stoneley wave slowness. Then, by optimizing this index with default values of the Index Matching Factor (IMF), the flow zone index was calculated and the permeability value was estimated based on that index. Some parameters required for these calculations such as porosity, type, and volume of minerals were determined based on the fullset logs analysis and with the help of cross-plots. Finally, in order to validate the obtained permeability data, these results were compared with the core data, and the IMF values were customized for the studied field. The results indicated that the main lithology of the Asmari Formation in the studied well is carbonate rock with a small amount of shale. The customized IMF value for calcite, dolomite, anhydrite, and shale was 11.93, 10.53, 0, and 0 respectively. The correlation coefficient between Stoneley-Flow Zone Index permeability and core permeability was 0.79. Therefore, according to this good correlation, this method can be used to estimate permeability, especially in wells without core data.
Research Paper
Chemical Engineering
behrouz Bayati; pardis morshedi; Akbar Falahi; Towan Kikhavandi
Abstract
HThe formation of heat stable salts, such as acetate, formate, oxalate, and thiosulfate, in gas sweetening units creates various issues including corrosion, high foaming, and a reduction in unit efficiency. This research aimed to investigate the elimination of heat stable salts using an anion resin. ...
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HThe formation of heat stable salts, such as acetate, formate, oxalate, and thiosulfate, in gas sweetening units creates various issues including corrosion, high foaming, and a reduction in unit efficiency. This research aimed to investigate the elimination of heat stable salts using an anion resin. The findings indicate that it is feasible to remove approximately 85% of acetate anion salt from an amine solution at solution-to-resin ratio of 30. Two adsorption models, Langmuir and Freundlich, were employed to analyze the equilibrium adsorption of acetate anion salt. The results indicate that the Langmuir adsorption isotherm aligns more closely with the data obtained from the acetate anion ion exchange process with the resin. Furthermore, it was determined that the maximum adsorption capacity for acetate onto the resin is 15 mg/g at a temperature of 25°C. The impact of contact time during the adsorption process was examined using quasi-first-order and quasi-second-order kinetic models, as well as an intra-particle model. The results indicated that the quasi-first-order kinetic model provided the best fit to the data, and equilibrium adsorption was achieved after approximately 70 minutes. Thermodynamic parameters were also investigated, revealing a ΔH value of -12.7370 kJ/mol, indicating an exothermic adsorption process. Based on the conducted studies, the utilization of the selected resin appears to be a suitable option for the removal of heat stable salts.
