Research Paper
2. Synchrosqueezing-based Transform and its Application in Seismic Data Analysis

Saman Gholtashi; Mohammad Amir Nazari Siahsar; Amin RoshandelKahoo; Hosein Marvi; Alireza Ahmadifard

Volume 4, Issue 4 , Autumn 2015, Pages 1-14

http://dx.doi.org/10.22050/ijogst.2016.12474

Abstract
  Seismic waves are non-stationary due to its propagation through the earth. Time-frequency transforms are suitable tools for analyzing non-stationary seismic signals. Spectral decomposition can reveal the non-stationary characteristics which cannot be easily observed in the time or frequency representation ...  Read More

Research Paper
3. Minimizing Water Invasion into Kazhdumi Shale Using Nanoparticles

Aghil Moslemizadeh; Seyed Reza Shadizadeh

Volume 4, Issue 4 , Autumn 2015, Pages 15-32

http://dx.doi.org/10.22050/ijogst.2016.12475

Abstract
  Fluid invasion from water-based drilling mud (WBDM) into the shale formations causes swelling, high pressure zone near the wellbore wall, and eventually wellbore instability problems during drilling operations. For the stability of the wellbore, physical plugging of nanoscale pore throats could be considered ...  Read More

Research Paper
4. An Experimental Study on Permeability Reduction Resulting from Mixed BaSO4, CaSO4, and SrSO4 Scale Deposition in Porous Media during Water Injection

Saeed Naseri; Jamshid Moghadasi; Mohammad Jamialahmadi

Volume 4, Issue 4 , Autumn 2015, Pages 33-49

http://dx.doi.org/10.22050/ijogst.2016.12478

Abstract
  Sulfate scale deposition (BaSO4, CaSO4, and SrSO4) is a common problem in oilfield operations around the world, which causes significant formation damage during production and injection activities. This paper presents the results of an experimental study on the permeability reduction of porous media ...  Read More

Research Paper
5. Wettability Alteration of Sandstone and Carbonate Rocks by Using ZnO Nanoparticles in Heavy Oil Reservoirs

Masoumeh Tajmiri; Seyed Mousa Mousavi; Mohammad Reza Ehsani; Emad Roayaei; Ali Emadi

Volume 4, Issue 4 , Autumn 2015, Pages 50-66

http://dx.doi.org/10.22050/ijogst.2016.12479

Abstract
  Efforts to enhance oil recovery through wettability alteration by nanoparticles have been attracted in recent years. However, many basic questions have been ambiguous up until now. Nanoparticles penetrate into pore volume of porous media, stick on the core surface, and by creating homogeneous water-wet ...  Read More

Research Paper
6. Studying the Effect of the Concentration of PTFE Nanoparticles on the Tribological Behavior of Ni-P-PTFE Composite Coatings

Hamid Rahmati; Farzad Mahboobi

Volume 4, Issue 4 , Autumn 2015, Pages 67-75

http://dx.doi.org/10.22050/ijogst.2016.12480

Abstract
  In the past 30 years, electroless nickel (EN) plating has grown to such proportions that these coatings and their applications are now found underground, in outer space, and in a myriad of areas in between. Moreover, in order to further improve the mechanical and tribological properties of the nickel-phosphorous ...  Read More

Research Paper
7. Application of Electro-Fenton (EF) Process to the Removal of Pentachlorophenol from Aqueous Solutions

Zahra Heidari; Mohsen Motevasel; Nemat Allah Jaafarzadeh

Volume 4, Issue 4 , Autumn 2015, Pages 76-87

http://dx.doi.org/10.22050/ijogst.2016.12481

Abstract
  Pentachlorophenol (PCP) is a very hazardous compound which enters into the environment by industries such as refineries and petrochemicals. As its biological degradation is very slow, this use may cause the pollution of soils and groundwater; with the recent emergence of pentachlorophenol contamination ...  Read More