Petroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701An Experimental Study on the Operating Parameters of Ultrasound-assisted Oxidative Desulfurization1179424310.22050/ijogst.2019.171123.1492ENSeyede LeilaEbrahimiPh.D. Candidate, Gas Engineering Department, Petroleum University of Technology (PUT), Ahwaz, IranMohammadrezaKhosravi-NikouAssociate Professor, Gas Engineering Department, Petroleum University of Technology (PUT), Ahwaz, IranSeyed HassanHashemabadiProfessor, School of Chemical Engineering, Iran University of Science and Technology, Tehran, IranJournal Article20190206In this research, the effects of important parameters, including the molar ratio of acetic acid to sulfur(S) , sonication time, temperature, and hydrogen the molar ratio of peroxide to sulfur on the performance of ultrasound-assisted oxidative desulfurization were studied using the response surface method (RSM). To this end, a model fuel containing n-decane and dibenzothiophene at a concentration of 1000 ppm was used. It was found out that the temperature and acetic acid/S molar ratio were the most influencing parameters affecting the conversion of sulfur compound. The synergistic effects of the parameters were also investigated, and it was discovered that the maximum conversion of dibenzothiophene reached 98.59% when H<sub>2</sub>O<sub>2</sub>/S, acetic acid/S, temperature, and sonication time were set to 167, 330, 80 °C, and 30 min respectively. Finally, the apparent kinetics of dibenzothiophene oxidation and the activation energy of reaction were presented.https://ijogst.put.ac.ir/article_94243_35654af367f125d3798f1b60e1e7ac91.pdfPetroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701An Evaluation of Rock Integrity and Fault Reactivation in the Cap Rock and Reservoir Rock Due to Pressure Variations18399424510.22050/ijogst.2019.136347.1462ENMohammadAbdidehAssistant Professor, Department of Petroleum Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, IranYaghobHamidM.S. Student, Department of Petroleum Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, IranJournal Article20190113Cap rocks are dams which can prevent the upward movement of hydrocarbons. They have disparities and weaknesses including discontinuities, crushed areas, and faults. Gas injection is an effective mechanism for oil recovery and pore pressure. With increasing pore pressure, normal stress is reduced, and the integrity of impermeable boundaries (cap rock, fault, etc.) becomes instable. A successful strategy for reservoir development is the inevitable necessity of conducting geomechanical studies and modeling the reservoir. The construction of a comprehensive geomechanical model, including the stress state is a function of depth (direction and amount), physical properties of the reservoir rock and its formations (rock resistance and elastic moduli), pore pressure estimation, and description and distribution of fractures and faults. In this work, analytical and numerical methods have been used in geomechanical modeling, and the data used for modeling and petrophysical information are downhole tests. The geomechanical modeling of gas injection into the reservoir and, simultaneously, the operation of Asmari reservoir and Marun oilfield cap rock in the southwest of Iran were carried out. The threshold of reactivating faults and the critical pressure of induced fracture were calculated, and the results were presented as analytical and numerical models. Moreover, in addition to analyzing the stress field at depths, the resistance parameters of the formations were determined. The results showed that the most changes and instabilities were around the wellheads, fractures, and the edges of the field.https://ijogst.put.ac.ir/article_94245_a2ff3036739fef1b97036ccef5188c48.pdfPetroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701An Analytical Solution for One-dimensional Horizontal Imbibition in a Cocurrent Flow40579424710.22050/ijogst.2018.118644.1434ENImanJafariAssistant Professor, Department of Chemical Engineering, Jask Branch, Islamic Azad University, Jask, IranMohsenMasihiProfessor, Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran0000-0002-2937-0668MasoudNasiri ZarandiAssociate Professor, Faculty of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan, IranJournal Article20180427Cocurrent spontaneous imbibition (COCSI) of an aqueous phase into matrix blocks arising from capillary forces is an important mechanism for petroleum recovery from fractured petroleum reservoirs. In this work, the modeling of countercurrent imbibition is used to develop the appropriate scaling equations. Considering the imbibition process and the water and oil movement respectively as the wet phase and the non-wet phase in a block saturated by oil and surrounded by two vertical fractures full of water, a differential equation having partial and nonlinear derivatives is introduced using Darcy and mass balance equations. On the other hand, as there is no analytical solution for this equation, a new equation is introduced by considering the different intervals of the wet and non-wet phase viscosity and by selecting the best suitable functions for relative permeability and capillary pressure. Considering the boundary conditions governing the countercurrent imbibition, an analytical solution (equation) is developed. Finally, the developed equation is validated. The results of this research can be very important for a better understanding of the imbibition process and the water and oil movement in the fractured environments.https://ijogst.put.ac.ir/article_94247_b0f2acb5dc3cde2fee0462827ee3b7f9.pdfPetroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701Improving Water-oil Relative Permeability Parameters Using New Synthesized Calcium Oxide and Commercial Silica Nanofluids58729424810.22050/ijogst.2019.146641.1473ENYaserAhmadiAssistant Professor, Petroleum and Chemical Engineering Department, Ilam University, Ilam, IranBabakAminshahidyAssociate Professor, Oil and Gas Research Institute, Ferdowsi University of Mashhad, Mashhad, Iran
Associate Professor, Petroleum and Chemical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran0000-0001-5354-1298Journal Article20190519This paper addressed the application of new hydrophobic synthesized calcium oxide (CaO) and silicon dioxide (SiO<sub>2</sub>) nanofluids to low permeability carbonate porous media. Crude oil and plugs were selected from one of oil reservoirs in the west of Iran. The main goal of this paper is comparing the results of improving water-oil relative permeability parameters in low permeability plugs of carbonate cores in the presence of new synthesized CaO and SiO<sub>2</sub> nanofluids. All the experiments were performed at a temperature of 40 °C and at a nanoparticle concentration of 45 ppm. The experimental approaches were designed into two main steps: 1) the effects of both nanoparticles on the changes in interfacial tension (between oil and brine) and oil viscosity 2) the effects of both nanoparticles on wettability (qualitatively) and relative permeability parameters. SiO<sub>2</sub> and CaO decreased interfacial tension from 46.414 mN/m to 41.772 mN/m and 32.860 mN/m respectively. Moreover, SiO<sub>2</sub> and CaO decreased oil viscosity from 9.90 cP to 8.61 cP and 8.01 cP respectively. Based on the obtained results in the core flood experiments, although CaO and SiO<sub>2</sub> nanofluids decreased effective water permeability, effective oil permeability and ultimate oil recovery increased. Moreover, it was seen that the CaO nanofluid improved oil flow in carbonate cores more than the commercial SiO<sub>2</sub> flooding. Finally, it was seen that both nanoparticles change the wettability from oil-wet to water-wet (qualitatively).https://ijogst.put.ac.ir/article_94248_beb4c3ccb40b5e3c93df798471ebedf9.pdfPetroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701The Selection of Amine Solvent in Gas Treating Process Considering Physical and Process Criteria Using Multiple Criteria Decision-making Techniques: A Case Study of Ilam Gas Treating Company73889424910.22050/ijogst.2017.93209.1396ENMasoudSeidiAssistant Professor, School of Engineering, Ilam University, Ilam, P.O. Box 69315/516, IranMohsenKhezeliPh.D. Candidate, Department of Industrial Engineering, Islamic Azad University, Science and Research Branch, Tehran, IranBehrouzBayatiAssistant Professor, Department of Chemical Engineering, Ilam University, Ilam, P.O. Box 69315/516, IranEsmaeilNajafiAssistant Professor, Department of Industrial Engineering, Islamic Azad University, Science and Research Branch, Tehran, IranJournal Article20170722In the current work, a framework is presented for amine solvent selection in gas treating process. Since the appropriate decision making in this field affects the capital and operational costs, multi attribute decision making (MADM) techniques were used to rank alternatives. The determination of criteria and alternatives is the most important aspect in the MADM. Criteria were divided into two categories, namely physical and process, and twelve physical indexes and nine process indexes were detected. Mono-ethanol amine (MEA), di-glycol amine (DGA), di-ethanol amine (DEA), di-isopropanol amine (DIPA), and methyl di-ethanol amine (MDEA) are intended as alternatives. The importance of the criteria was expressed by weights, and the weights were determined by the analytic hierarchy process (AHP) method. The traditional Technique for Order Preferences by Similarity to an Ideal Solution (TOPSIS) method was applied to the physical criteria with crisp data. The modified interval TOPSIS technique was used to study the process criteria with interval data. The data of the criteria and alternatives were collected from Ilam Gas Treating Company, and the solution for sour gas sweetening was ranked by the proposed approach. Based on our computations, MDEA was defined as the best amine solvent with an average ranking of 1.5.https://ijogst.put.ac.ir/article_94249_19be44d5d5c13ad14ba9f161e66b5536.pdfPetroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701Investigating the Solubility of CO2 in the Solution of Aqueous K2CO3 Using Wilson-NRF Model891009425010.22050/ijogst.2018.122093.1443ENRezaMoradiM.S. Student, Department of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, IranSeyed HosseinMazloumiAssistant Professor, Department of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, IranJournal ArticleHot potassium carbonate (PC) solution in comparison with amine solution had a decreased energy of regeneration and a high chemical solubility of . To present vapor and liquid equation (VLE) of this system and predict solubility, the ion specific non-electrolyte Wilson-NRF local composition model (isNWN) was used in this study; the framework of this model was molecular. Therefore, it was suitable for both electrolyte and non-electrolyte solutions. The present research employed the NWN model and the Pitzer-Debye-Hückel theory in order to assess the contribution of the excess Gibbs energy of electrolyte solutions in a short and long range. The data of solubility in water and the system of aqueous were correlated in the model considering a temperature range of and a pressure range of and . The average absolute error of ( ) and ( ) systems were and respectively. The results and comparisons with other models proved that the experimental data were exactly correlated in the model.https://ijogst.put.ac.ir/article_94250_1fcf6bd122b401261b06f04ae49cf3a7.pdfPetroleum University of TechnologyIranian Journal of Oil and Gas Science and Technology2345-24128320190701Thermodynamic and Kinetic Investigations of Corrosion Inhibition Behavior of 2-MBT on Steel at a pH of 81011125573210.22050/ijogst.2018.55732ENHojatallahKoraeeM.S. Student, Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, IranHadiEskandariAssistant Professor, Department of Technical Inspection, Petroleum University of Technology, Abadan, IranImanDanaeeAssociate Professor, Department of Technical Inspection, Petroleum University of Technology, Abadan, IranJournal Article20150416Corrosion results in hazardous and expensive damage to pipelines, vehicles, water and wastewater systems, and even home appliances. One of the most extensively practical methods for protecting metals and alloys against corrosion is to use organic inhibitors. The inhibition capability of 2-Mercaptobenzothiazole (2-MBT) against the corrosion of carbon steel in a 2 M NaCl solution was examined by Tafel polarization. By using 2-Mercaptobenzothiazole both the cathodic and anodic reactions are delayed through chemical and physical adsorption and blocking the active corrosion sites. Based on the polarization curves, it was indicated that by increasing the inhibitor concentration, the inhibition efficiency increases up to 70% at room temperature, and it improves at higher temperatures. The adsorption of 2-Mercaptobenzothiazole was based on the Langmuir adsorption isotherm. The enthalpies of activation were determined to be around +50 kJ.mol<sup>-1</sup>. The endothermic nature of the steel dissolution procedure is reflected by the positive symbols of the enthalpies (ΔH) of activation process. The determined values range from -32.69 to -35.81 kJ.mol<sup>-1</sup>, which shows both electrostatic adsorption and the chemisorption of the adsorption mechanism. The calculated entropy of adsorption was 78 J.mol<sup>-1</sup><sub>.</sub>K<sup>-1</sup> indicating the increment in the solvent entropy and a more positive water desorption entropy.https://ijogst.put.ac.ir/article_55732_03af645c1af4422ba35dc9003a00dbdd.pdf