76. A Novel Method for Ultrasonic Evaluation of Horizontal Defects Using Time-of-Flight Diffraction

Parastoo Bagheri; Sina Sodagar; Gholamreza Rashed; Amin Yaghootian

Volume 3, Issue 4 , Autumn 2014, , Pages 16-25

http://dx.doi.org/10.22050/ijogst.2014.7484

Abstract
  Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. Although ToFD can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. In ...  Read More

77. Organic Geochemistry and Paleoenvironments of Deposition of the Middle Jurassic Sediments from the Tabas Basin, Central Iran

Bahram Alizadeh; Majid Alipour; Bahram Habibnia; Ahmad Reza Gandomi-Sani; Behzad Khani; Saber Shirvani; AmirAbbas Jahangard

Volume 4, Issue 1 , Winter 2015, , Pages 17-34

http://dx.doi.org/10.22050/ijogst.2015.8613

Abstract
  In an attempt to reconstruct the paleoenvironments of deposition for the Middle Jurassic Baghamshah formation, samples collected from six outcrop sections along the Shotori swell were subjected to detailed geochemical analyses. Bulk geochemical and biological marker data indicate a logical trend of the ...  Read More

Chemical Engineering
78. An Experimental Investigation and Prediction of Asphaltene Deposition during Laminar Flow in the Pipes Using a Heat Transfer Approach

Farhad Salimi; Shahab Ayatollahi; Mohsen Vafaie Seftie

Volume 6, Issue 2 , Spring 2017, , Pages 17-32

http://dx.doi.org/10.22050/ijogst.2017.47414

Abstract
  In this study, asphaltene deposition from crude oil has experimentally and theoretically been studied using a test loop and an accurate temperature monitoring during a laminar flow. The effects of oil velocity and surface temperature on the thickness of asphaltene deposition were investigated. The results ...  Read More

79. An Experimental Investigation of Wettability Alteration in Carbonate Reservoir Using γ-Al2O3 Nanoparticles

Mohsen Seid Mohammadi; Jamshid Moghadasi; Saeed Naseri

Volume 3, Issue 2 , Spring 2014, , Pages 18-26

http://dx.doi.org/10.22050/ijogst.2014.6034

Abstract
  Wettability alteration is one of the most important methods for oil recovery from sandstone and carbonate reservoirs. The effects of salinity, pH, temperature, and chemicals such as surfactants and fatty acids on the alteration of the wettability were described in previous studies. In recent years, attention ...  Read More

80. Toward a Thorough Approach to Predicting Klinkenberg Permeability in a Tight Gas Reservoir: A Comparative Study

Sadegh Baziar; Mohammad Mobin Gafoori; Seyed Mehdi Mohaimenian Pour; Majid Nabi Bidhendi; Reza Hajiani

Volume 4, Issue 3 , Summer 2015, , Pages 18-36

http://dx.doi.org/10.22050/ijogst.2015.10365

Abstract
  Klinkenberg permeability is an important parameter in tight gas reservoirs. There are conventional methods for determining it, but these methods depend on core permeability. Cores are few in number, but well logs are usually accessible for all wells and provide continuous information. In this regard, ...  Read More

81. The Effect of Temperature and Injection Rate during Water Flooding Using Carbonate Core Samples: An Experimental Approach

Yaser Ahmadi; Mehdi Hassanbeygi; Riyaz Kharrat

Volume 5, Issue 4 , Autumn 2016, , Pages 18-24

http://dx.doi.org/10.22050/ijogst.2016.41569

Abstract
  In many reservoirs, after water flooding, a large volume of oil is still left behind. Hot water injection is the most basic type of thermal recovery which increase recovery by improved sweep efficiency and thermal expansion of crude.In the present work, the effects of injection rate and the temperature ...  Read More

Petroleum Engineering
82. Effects of pH and Temperature on Oilfield Scale Formation

Jaber Azizi; Seyed Reza Shadizadeh; Abbas Khaksar Manshad; Naghi Jadidi

Volume 7, Issue 3 , Summer 2018, , Pages 18-31

http://dx.doi.org/10.22050/ijogst.2017.58038.1350

Abstract
  Water flooding is one of the most influential methods for pressure maintenance and enhanced oil recovery. However, water flooding is likely to develop the formation of oilfield scale. Scale formation in reservoirs, due to the mixing of injection water and formation water, could cause formation damage ...  Read More

83. Evaluation of a Naturally-derived Deflocculant (Terminalia Chebula) in Bentonite Dispersions

Jalal Neshat; Seyed Reza Shadizadeh

Volume 5, Issue 2 , Spring 2016, , Pages 21-44

http://dx.doi.org/10.22050/ijogst.2016.15788

Abstract
  The unwanted addition of salt to drilling causes flocculation which has an adverse effect on mud rheological properties. To treat the flocculated mud chemical, deflocculants are commonly used; however, their disadvantages such as negative environmental effects, lower tolerance to contamination, and toxicity ...  Read More

84. A Physical-based Model of Permeability/Porosity Relationship for the Rock Data of Iran Southern Carbonate Reservoirs

Sajjad Gholinezhad; Mohsen Masihi

Volume 1, Issue 1 , Autumn 2012, , Pages 25-36

http://dx.doi.org/10.22050/ijogst.2012.2772

Abstract
  The prediction of porosity is achieved by using available core and log data; however, the estimation of permeability is limited to the scare core data. Hence, porosity and saturation data through the framework of flow units can be used to make an estimation of reservoir permeability. The purpose of this ...  Read More

Petroleum Engineering
85. Modeling Critical Flow through Choke for a Gas-condensate Reservoir Based on Drill Stem Test Data

Ahmad Lak; Reza Azin; Shahriar Osfouri; Rouhollah Fatehi

Volume 6, Issue 3 , Summer 2017, , Pages 29-40

http://dx.doi.org/10.22050/ijogst.2017.69063.1371

Abstract
  Gas-condensate reservoirs contain hydrocarbon fluids with characteristics between oil and gas reservoirs and a high gas-liquid ratio. Due to the large gas-liquid ratio, wellhead choke calculations using the empirical equations such as Gilbert may contain considerable error. In this study, using drill ...  Read More

Electrical Engineering – Control
86. Managed Pressure Drilling Using Integrated Process Control

Mahdi Imanian; Mahdi Karbasian; Aazam Ghassemi

Volume 9, Issue 2 , Spring 2020, , Pages 31-60

http://dx.doi.org/10.22050/ijogst.2020.177554.1499

Abstract
  Control of wellbore pressure during drilling operations has always been important in the oil industry as this can prevent the possibility of well blowout. The present research employs a combination of automatic process control and statistical process control for the first time for the identification, ...  Read More

Petroleum Engineering – Production
87. An Experimental Study of Acid Diversion by Using Gelled Acid Systems Based on Viscoelastic Surfactants: A Case Study on One of Iran Southwest Oilfields

Abdorrahman Mehri Ghahfarrokhi; Ezzatollah Kazemzadeh; Hassan Shokrollahzadeh Behbahani; Gholam Abbas Safian

Volume 8, Issue 1 , Winter 2019, , Pages 32-46

http://dx.doi.org/10.22050/ijogst.2018.139168.1464

Abstract
  In matrix acidizing operations, the main goal is increasing permeability. For production engineers, it is desirable that acid could be injected into whole [M.N.1] [amehri.gh2] pay zone. Sometimes, this pay zone has a long height and various sub-layers which have different permeability values. ...  Read More

Petroleum Engineering
88. A Comparative Study of the Neural Network, Fuzzy Logic, and Nero-fuzzy Systems in Seismic Reservoir Characterization: An Example from Arab (Surmeh) Reservoir as an Iranian Gas Field, Persian Gulf Basin

Reza Mohebian; Mohammad Ali Riahi; Ali Kadkhodaie-Ilkhchi

Volume 6, Issue 4 , Autumn 2017, , Pages 33-55

http://dx.doi.org/10.22050/ijogst.2017.53907

Abstract
  Intelligent reservoir characterization using seismic attributes and hydraulic flow units has a vital role in the description of oil and gas traps. The predicted model allows an accurate understanding of the reservoir quality, especially at the un-cored well location. This study was conducted in two major ...  Read More

Petroleum Engineering
89. A Novel Approach to Obtaining the Optimum Pressure and Stages of Separators

Ali Moazami Goodarzi; Arman Darvish Sarvestani; Ali Hadipour

Volume 9, Issue 1 , Winter 2020, , Pages 33-46

http://dx.doi.org/10.22050/ijogst.2019.153012.1480

Abstract
  Nowadays, the increasing demand for energy in the world is one of the main concerns for energy supply. In fact, the required energy can be obtained by increasing the production rate of fossil fuels such as oil and natural gas. However, improving the efficiency of the equipment and facilities might have ...  Read More

Petroleum Engineering – Reservoir
90. Occurrence and Distribution of Chrysene and its Derivatives in Crude Oils and Source Rock Extracts from Niger Delta, Nigeria

Abiodun Ogbesejana; Oluwadayo Sonibare; Zhong Ningning; Oluwasesan Bello

Volume 8, Issue 2 , Spring 2019, , Pages 34-52

http://dx.doi.org/10.22050/ijogst.2018.128598.1454

Abstract
  Crude oils and source rocks from the northern and offshore Niger Delta basin, Nigeria, have been characterized by gas chromatography-mass spectrometry in terms of their origin and thermal maturity based on the distribution of chrysene and its derivatives. The crude oils and source rocks were characterized ...  Read More

Petroleum Engineering
91. Choosing a Suitable Method of Acquiring Logging Technology of Oil and Gas Wells in Iran: (A Case Study of National Iranian Drilling Company)

Ali Daghaieghi; Nima Mokhtarzadeh

Volume 7, Issue 2 , Spring 2018, , Pages 35-51

http://dx.doi.org/10.22050/ijogst.2018.55733

Abstract
  Drilling industry and its technical services are among the complex and advanced technology-based industries in the cycle of oil exploration and production. In this regard, the logging services role as one of the pillars of technical services is very important due to technological complexity and the importance ...  Read More

Petroleum Engineering
92. Chemical Modification of Lignite and Investigation of its Properties in Controlling Fluid Loss of Oil Well Cement Slurries

Ali Nemati Kharat; Ali akbar Ghaffari

Volume 8, Issue 4 , Autumn 2019, , Pages 35-49

http://dx.doi.org/10.22050/ijogst.2019.128036.1457

Abstract
  The aim of this research was to produce a convenient additive for enhancing the properties, especially the fluid loss, of oil well cement slurries. In this regard, a variety of drilling/cementing chemical additives known as fluid loss controllers were prepared through derivatization and chemical modification ...  Read More

Petroleum Engineering – Exploration
93. Evaluation of Reservoir Properties Using Wireline Logs of Well Sarai-Sidhu-1, Punjab Platform, Central Indus Basin, Pakistan

Syed Waqas Haider; Mustafa Yar; Raja Ahtisham Ghafoor; Tallat Majeed Khan

Volume 7, Issue 4 , Autumn 2018, , Pages 36-44

http://dx.doi.org/10.22050/ijogst.2018.95773.1400

Abstract
  The well Sarai Sidhu-01 is located on Punjab Platform, Central Indus Basin, Pakistan. Punjab Platform is the eastern part of Central Indus Basin, and tectonically it is the stable portion of Indus Basin, which was least affected during Tertiary Himalayan orogeny. This study attempts to decipher reservoir ...  Read More

Petroleum Engineering – Reservoir
94. Integrated Characterization and a Tuning Strategy for the PVT Analysis of Representative Fluids in a Gas Condensate Reservoir

Shahriar Osfouri; Reza Azin; Hamid reza Amiri; Zahra Rezaei; Mahmoud Moshfeghian

Volume 7, Issue 1 , Winter 2018, , Pages 40-59

http://dx.doi.org/10.22050/ijogst.2017.78181.1383

Abstract
  Gas condensate reservoirs are characterized by a distinctive retrograde behavior and potential for condensate drop out during production and sampling. Efficient modeling of gas condensate reservoir requires careful phase behavior studies of samples collected prior to and during the production life of ...  Read More

Petroleum Engineering
95. An Analytical Solution for One-dimensional Horizontal Imbibition in a Cocurrent Flow

Iman Jafari; Mohsen Masihi; Masoud Nasiri Zarandi

Volume 8, Issue 3 , Summer 2019, , Pages 40-57

http://dx.doi.org/10.22050/ijogst.2018.118644.1434

Abstract
  Cocurrent 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. ...  Read More

Chemical Engineering
96. Techno-Economic Analysis of Heavy Fuel Oil Hydrodesulfurization Process for Application in Power Plants

Mostafa Jafari; Amirhossein Khalili-Garakani

Volume 10, Issue 1 , Winter 2021, , Pages 40-65

http://dx.doi.org/10.22050/ijogst.2020.254534.1569

Abstract
  In Iran, power plants use liquid fuels such as heavy fuel oil (HFO) or mazut to prevent disruption in power generation. The high percentage of sulfur compounds in HFO and the lack of efforts to remove it, causing significant damage to the environment. The purpose of this research is performing a techno-economic ...  Read More

97. Application of Homotopy Perturbation Method to One-dimensional Transient Single-phase EM Heating Model

Hossein Fazeli; Shahin Kord

Volume 2, Issue 2 , Spring 2013, , Pages 20-33

http://dx.doi.org/10.22050/ijogst.2013.3535

Abstract
  Thermal recovery involves well-known processes such as steam injection (cyclic steam stimulation, steam drive, and steam-assisted gravity drainage), in situ combustion, and a more recent technique that consists of heating the reservoir with electrical energy. When high frequency is used for heating, ...  Read More

98. A Least Squares Approach to Estimating the Average Reservoir Pressure

Kambiz Razminia; Abdolnabi Hashemi; Abdolhassan Razminia

Volume 2, Issue 1 , Winter 2013, , Pages 22-32

http://dx.doi.org/10.22050/ijogst.2013.3035

Abstract
  Least squares method (LSM) is an accurate and rapid method for solving some analytical and numerical problems. This method can be used to estimate the average reservoir pressure in well test analysis. In fact, it may be employed to estimate parameters such as permeability (k) and pore volume (Vp). Regarding ...  Read More

99. An Estimation of Wave Attenuation Factor in Ultrasonic Assisted Gravity Drainage Process

Behnam Keshavarzi; Mohammad Javad Shojaei; Mohammad Hossein Ghazanfari; Cyrus Ghotbi

Volume 3, Issue 1 , Winter 2014, , Pages 22-33

http://dx.doi.org/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 ...  Read More

100. The Porosity Prediction of One of Iran South Oil Field Carbonate Reservoirs Using Support Vector Regression

Mohsen Karimian; Nader Fathianpour; Jamshid Moghaddasi

Volume 2, Issue 3 , Summer 2013, , Pages 25-36

http://dx.doi.org/10.22050/ijogst.2013.3642

Abstract
  Porosity is considered as an important petrophysical parameter in characterizing reservoirs, calculating in-situ oil reserves, and production evaluation. Nowadays, using intelligent techniques has become a popular method for porosity estimation. Support vector machine (SVM) a new intelligent method with ...  Read More