@article { author = {}, title = {Table of Content}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {-}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {}, abstract = {}, keywords = {}, url = {https://ijogst.put.ac.ir/article_5816.html}, eprint = {https://ijogst.put.ac.ir/article_5816_9c34317b0355f059045c2cd1ddeb65d5.pdf} } @article { author = {Ansari, Hamid Reza and Motafakkerfard, Reza and Riahi, Mohammad Ali}, title = {Comparing Geostatistical Seismic Inversion Based on Spectral Simulation with Deterministic Inversion: A Case Study}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {1-14}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {10.22050/ijogst.2014.5796}, abstract = {Seismic inversion is a method that extracts acoustic impedance data from the seismic traces. Source wavelets are band-limited, and thus seismic traces do not contain low and high frequency information. Therefore, there is a serious problem when the deterministic seismic inversion is applied to real data and the result of deterministic inversion is smooth. Low frequency component is obtained from well log data; however, but when well log and seismic data are used together, it faces a problem which is a function of the support of scale of measurements. Well log data have a high vertical resolution while seismic data represent low details in vertical direction. Geostatistical seismic inversion (GSI) is a method to overcome the aforementioned limitations. GSI uses well log and seismic data together in the geostatistical frameworks. In this study, a new approach of geostatistical inversion based on spectral geostatistical simulation is used. This approach is performed in frequency domain and stochastic framework. Distinct from sequential simulation, spectral simulation method is a direct method, which does not require an acceptance/rejection step. Hence, GSI algorithm based on spectral simulation is fast. This approach is performed in a case study of an Iranian gas field in the Persian Gulf basin. The upper-Dalan and Kangan are two main formations of this field. The results of GSI are compared with deterministic inversion and it is concluded that, as opposed to deterministic inversion, GSI can recover low frequency components.}, keywords = {Geostatistical Seismic Inversion,deterministic inversion,Spectral Simulation,Geostatistics}, url = {https://ijogst.put.ac.ir/article_5796.html}, eprint = {https://ijogst.put.ac.ir/article_5796_5b19d77b7aeaae456a255fbdea475d9c.pdf} } @article { author = {Najafi, Mahdi and Bahroudi, Abbas and Yassaghi, Ali and Vergés, Jaume and Sherkati, Shahram}, title = {An Investigation of Abnormal Fluid Pressure within an Evaporitic Cap Rock in the Gavbandi Area of Iran and its Impact on the Planning of Gas Exploration Wells}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {15-21}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {10.22050/ijogst.2014.5797}, abstract = {A synthesis of well logs was carried out and drilling mud weight data were analyzed to figure out anomalous high fluid pressure within the Triassic evaporitic cap rock (the Dashtak formation) and study its impact on the geometry of anticlinal traps in the gas rich Gavbandi province located in the southeast part of the Zagros Mountains. The results indicated that the location of anticlinal traps at the depth in which the Permian Dehram Group reservoir unit exists is horizontally displaced with respect to surficial crest of many anticlines within the Gavbandi area. This crestal shift may be induced by abnormally high fluid pressure in the “A evaporate” member of the Dashtak formation, detected in many exploration wells across the area. When fluid pressure increases due to compaction during shortening, the higher shaliness could probably cap more fluids and consequently increase the fluid pressure within the Dashtak formation. Anomalous high fluid pressure decreases internal friction and shear strength of rock units and facilitates fracturing and faulting within the Dashtak formation, which consequently causes crestal shift of anticlinal traps. This should be taken into account when planning a new exploration well in Gavbandi area in order to prevent trap drilling.}, keywords = {Evaporitic Cap Rock,Fluid pressure,Anticlinal Trap,Crestal Shift,Gas Exploration Well}, url = {https://ijogst.put.ac.ir/article_5797.html}, eprint = {https://ijogst.put.ac.ir/article_5797_3595d246b027cabab39aabfc1890ccf5.pdf} } @article { author = {Keshavarzi, Behnam and Shojaei, Mohammad Javad and Ghazanfari, Mohammad Hossein and Ghotbi, Cyrus}, title = {An Estimation of Wave Attenuation Factor in Ultrasonic Assisted Gravity Drainage Process}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {22-33}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {10.22050/ijogst.2014.5798}, abstract = {It has been proved that ultrasonic energy can considerably increase the amount of oil recovery in an immiscible displacement process. Although many studies have been performed on investigating the roles of ultrasonic waves, based on the best of our knowledge, little attention has been paid to evaluate wave attenuation parameter, which is an important parameter in the determination of the energy delivered to the porous medium. In this study, free fall gravity drainage process is investigated in a glass bead porous medium. Kerosene and Dorud crude oil are used as the wetting phases and air is used as the non-wetting phase. A piston-like displacement model with considering constant capillary pressure and applying Corey type approximation for relative permeabilities of both wetting and nonwetting phases is applied. A pressure term is considered to describe the presence of ultrasonic waves and the attenuation factor of ultrasonic waves is calculated by evaluating the value of external pressure applied to enhance the flow using the history matching of the data in the presence and absence of ultrasonic waves. The results introduce the attenuation factor as an important parameter in the process of ultrasonic assisted gravity drainage. The results show that only a low percentage of the ultrasonic energy (5.8% for Dorud crude oil and 3.3% for kerosene) is delivered to the flow of the fluid; however, a high increase in oil recovery enhancement (15% for Dorud crude oil and 12% for Kerosene) is observed in the experiments. This proves that the ultrasonic waves, even when the contribution is not substantial, can be a significantly efficient method for flow enhancement.}, keywords = {Ultrasonic waves,Gravity Drainage,Attenuation Factor,Glass Bead Pack}, url = {https://ijogst.put.ac.ir/article_5798.html}, eprint = {https://ijogst.put.ac.ir/article_5798_710a1e2cc6e5e3b1c4f5f3fad4e3cffd.pdf} } @article { author = {Salehi, Seyyed Milad and Rahimi, Mahmood Reza}, title = {The Generalized Maxwell-Stefan Model Coupled with Vacancy Solution Theory of Adsorption for Diffusion in Zeolites}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {34-40}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {10.22050/ijogst.2014.5800}, abstract = {It seems using the Maxwell-Stefan (M-S) diffusion model in combination with the vacancy solution theory (VST) and the single-component adsorption data provides a superior, qualitative, and quantitative prediction of diffusion in zeolites. In the M-S formulation, thermodynamic factor (Г) is an essential parameter which must be estimated by an adsorption isotherm. Researchers usually utilize the simplest form of adsorption isotherms such as Langmuir or improved dual-site Langmuir, which eventually cannot predict the real behavior of mixture diffusion particularly at high concentrations of adsorbates because of ignoring nonideality in the adsorbed phase. An isotherm model with regard to the real behavior of the adsorbed phase, which is based on the vacancy solution theory (VST) and considers adsorbate-adsorbent interactions, is employed. The objective of this study is applying vacancy solution theory to pure component data, calculating thermodynamic factor (Г), and finally evaluating the simulation results by comparison with literature. Vacancy solution theory obviously predicts thermodynamic factor better than simple models such as dual-site Langmuir.}, keywords = {Adsorption,Maxwell-Stefan,Thermodynamic Factor,Vacancy Solution Theory}, url = {https://ijogst.put.ac.ir/article_5800.html}, eprint = {https://ijogst.put.ac.ir/article_5800_19c8b86029963b4dd04759770d84d5b3.pdf} } @article { author = {Mirzaie Goodarzi, Iman and Farzam, Mansour and Shishesaz, Mohammad Reza and Zaarei, Davood}, title = {Effect of Molar Ratio and Resin Modification on the Protection Properties of Zinc-rich Alkali Silicate Primer}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {41-53}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {10.22050/ijogst.2014.5801}, abstract = {The influence of increasing the SiO2/K2O molar ratio on the electrochemical action of a waterborne potassium silicate zinc-rich coating was investigated by means of electrochemical impedance spectroscopy (EIS) and corrosion potential (Ecorr) measurements. The EIS results showed that increasing the SiO2/K2O molar ratio in the range of 3.135 to 5 by the addition of nano-SiO2 to the resins improved the resistance of coatings; however, higher molar ratios showed an adverse effect. Moreover, the alkali silicate binder of the sample with a SiO2/K2O molar ratio of 5 was improved by adding 5, 10, and 15 wt.% of acrylic resin and acrylic/styrene copolymer to potassium silicate resin. These formulated coatings were sprayed over carbon steel plates and the adhesion and morphology of these primers were evaluated by pull-off, cross cut, and scanning electron microscopy tests. Electrochemical measurements showed that the sample with a SiO2/K2O molar ratio of 5 had better corrosion properties than the other samples. Adhesion and SEM tests also showed that B1 and C2 with respectively 5 and 10% acrylic derivatives had less holes, cracks, and better adhesive properties.}, keywords = {Zn-rich Coating,Molar Ratio,EIS,Adhesion,SEM}, url = {https://ijogst.put.ac.ir/article_5801.html}, eprint = {https://ijogst.put.ac.ir/article_5801_5a1831a4660fc4ec1d58a05a3d5b434c.pdf} } @article { author = {Kalvandi, Kobra and Sodagar, Sina}, title = {Resonance Ultrasonic Spectroscopy of a Nanofibrous Composite and Studying the Effect of Surface/Interface}, journal = {Iranian Journal of Oil and Gas Science and Technology}, volume = {3}, number = {1}, pages = {54-64}, year = {2014}, publisher = {Petroleum University of Technology}, issn = {2345-2412}, eissn = {2345-2420}, doi = {10.22050/ijogst.2014.5815}, abstract = {Resonances are intrinsic characteristics of an elastic object, which are completely independent of the source of excitation. The appropriate utilization of the information contained within the resonance spectra and the identification of the resonance frequencies of the object can be used as a potent tool for material characterization. In this paper, a new mathematical model for the wave diffraction from a cylindrical nanofiber encased in an elastic matrix is introduced. The new model is used to evaluate the scattered pressure field resulting from normal insonification on a single nanofibrous composite. It is shown that there are specific resonances, which arise from the surface/interface energy between the nanofiber and solid matrix. They can be used to determine the characteristics and properties of fibrous nanocomposites.}, keywords = {Diffraction,Resonance Ultrasonic Spectroscopy,Surface/Interface Effect}, url = {https://ijogst.put.ac.ir/article_5815.html}, eprint = {https://ijogst.put.ac.ir/article_5815_d24eb30968ba0e1259265d020d269a54.pdf} }