Search for: wettability-alteration
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    Experimental study of the chemical stimulation of Iranian fractured carbonate reservoir rocks as an EOR potential, the impact on spontaneous imbibition and capillary pressure

    , Article Scientia Iranica ; Volume 17, Issue 1 C , 2010 , Pages 37-45 ; 10263098 (ISSN) Zangeneh Var, A. R ; Bastani, D ; Badakhshan, A ; Sharif University of Technology
    Beside their worldwide abundance, oil recovery from fractured carbonate reservoirs is commonly low. Such reservoirs are usually oil-wet, thus, waterflooding leads into early breakthrough and low recovery due to the high conductivity of the fracture network, negative capillary pressure of the matrix and, consequently, the poor spontaneous imbibitions of water from fractures into the matrix during the course of waterflooding. In such problematic reservoirs, changing the wettability of the matrix toward water-wetness can improve spontaneous imbibition by changing the sign and, thus, the direction of capillary forces, resulting in an improvement of waterflood efficiency and, consequently, oil... 

    Model development for MEOR process in conventional non-fractured reservoirs and investigation of physico-chemical parameter effects

    , Article Chemical Engineering and Technology ; Volume 31, Issue 7 , 2008 , Pages 953-963 ; 09307516 (ISSN) Behesht, M ; Roostaazad, R ; Farhadpour, F ; Pishvaei, M. R ; Sharif University of Technology
    A three-dimensional multi-component transport model in a two-phase oil-water system was developed. The model includes separated terms to account for the dispersion, convection, injection, growth and death of microbes, and accumulation. For the first time, effects of both wettability alteration of reservoir rock from oil wet to water wet and reduction in interfacial tension (IFT) simultaneously on relative permeability and capillary pressure curves were included in a MEOR simulation model. Transport equations were considered for the bacteria, nutrients, and metabolite (bio-surfactant) in the matrix, reduced interfacial tension on phase trapping, surfactant and polymer adsorption, and effect... 

    Micromodel Investigation of the Non-Monotonic Effect of Injection Water Salinity on Wettability and Oil Recovery

    , M.Sc. Thesis Sharif University of Technology Karimpour Khamaneh, Mehran (Author) ; Mahani, Hassan (Supervisor)
    Based on numerous laboratory and field evidence, low-salinity waterflooding or engineered salinity waterflooding can lead to enhanced oil production. According to the literature, the mechanisms involved in this process can be divided into two general categories: fluid-fluid interactions and solid-liquid interactions. These mechanisms are caused by intermolecular and electrostatic forces at the rock and fluid interfaces. The most important controlling factor of the electrostatic forces is the concentration of ions at/near fluids-rock interface. Therefore, improving the concentration of ions causes a shift in wettability toward a more water-wetting state, eventually leading to increased oil... 

    Wettability Alteration of Reservoir Rocks to Super Gas-Wet Condition Using Nanocomposite by Applying Contact Angle Measurement for Gas-Crude Oil System

    , M.Sc. Thesis Sharif University of Technology Zandi, Ahmad (Author) ; Ghazanfari, Mohammad Hossien (Supervisor) ; Fatemi, Mobeen (Supervisor) ; Esmaeilzadeh, Pouriya (Co-Supervisor)
    Today, increasing the productivity of reservoirs is more important than in the past, while the use of nanoparticles to change the wettability of rock and increase the recovery factor from the reservoir has been considered by many researchers. Despite previous studies on the use of nanoparticles to change the wettability of rock to gas-wet, the use of nanocomposites with super gas-wet at high temperature and pressure in the crude oil-gas system has rarely been considered. In this research, several nanocomposites with different structures have been synthesized in the laboratory and nanofluids with different formulations have been used to coat the rock thin sections and measure droplet contact... 

    Core-scale Mechanistic Simulation of Engineered Salinity Waterflooding Using Bond-Product-Sum Method

    , M.Sc. Thesis Sharif University of Technology Almasian, Pourya (Author) ; Mahani, Hassan (Supervisor)
    Considering the world's diminishing oil reserves, as well as the growing demand for oil and energy consumption, Enhanced Oil Recovery (EOR) techniques are becoming increasingly important in the attempt to improve oil production. Engineering salinity waterflooding has gained widespread attention and popularity in the last two decades due to its environmental friendliness, lack of expensive additives, low operating costs, and ease of use as an oil extraction process. The goal of this study is to use an innovative method to develop a mechanistic approach model that simulates and forecasts the mechanism and performance of the engineered water flooding process. Wettability alteration, the most... 

    Mechanistic Investigation of Enhanced Oil Recovery by Engineered Water Using Computational Fluid Dynamics at Pore Scale

    , Ph.D. Dissertation Sharif University of Technology Namaee Ghasemi, Arman (Author) ; Ayatollahi, Shahaboddin (Supervisor) ; Mahani, Hassan (Supervisor)
    Despite the proven advantage of the engineered water flooding technique, a coherent and mechanistic understanding of the fundamental phenomena occurring at pore scale is lacking. Most of the available simulation models have a phenomenological approach and have limited predictive capability. One of the key questions is how to justify and relate large (Darcy) scale observations to effects and phenomena that essentially occur at much smaller scales (i.e. pore and molecular level). Furthermore, two-phase flow dynamics and the effect of complex interplay between wettability, capillary number, and ions dispersion in a heterogeneous porous medium on the trapping and mobilization of oil at pore... 

    Pore-scale Simulation of Trapping Phenomena and Hysteresis Effect in Porous Media

    , M.Sc. Thesis Sharif University of Technology Tabibnejad Azizi, Mehdi (Author) ; Fatemi, Mobeen (Supervisor)
    So far, many studies have been carried out on the core-scale regarding the effects of hysteresis on the macro-scale properties of systems including fluids and porous rock, however, many issues related to the physics of the problem (especially regarding the way fluids are distributed and the trapping of the non-wetting phase) at the pore-scale need further investigation. In the process of multiphase fluid flow in porous media, hysteresis refers to the dependence of the results of the fluids’ displacements on the history of fluid saturation and the direction of saturation changes (increasing or decreasing). The first step to investigate the hysteresis effect is to determine the amount of fluid... 

    Investigation of Low Salinity Waterflooding Predictive Capability and the Development of a Tool for Screening Candidates

    , M.Sc. Thesis Sharif University of Technology Golmohammadi, Meysam (Author) ; Mahani, Hassan (Supervisor) ; Ayatollahi, Shahab (Supervisor)
    Among different enhanced oil recovery (EOR) methods, low salinity waterflooding (LSWF) has been attractive to researchers because of its relative simplicity and lower environmental problems compared to other conventional EOR methods. Numerous researchers have attempted to find the main cause of the low salinity effect (LSE). According to previous studies, several experimental techniques have been proposed for predicting LSE and screening potential field candidates. However, there is a lack of a systematic investigation of all (or even some of) the methods to compare and determine their LSE predictive capability. Predictive capability development is essential because it saves costs and time... 

    Low Salinity Water Assisted by Surfactants for Enhanced Oil Recovery: Mechanistic Study and Spontaneous Imbibition Tests

    , M.Sc. Thesis Sharif University of Technology Heidari, Mehdi (Author) ; Ayatollahi, Shahabodin (Supervisor) ; Mahani, Hassan (Supervisor)
    Enhanced Oil Recovery (EOR) techniques have become of the main priorities of the oil industry during the high oil price era. It is interesting to note that the common method to increase production from reservoirs is the water injection method, which recovers a very low amount of oil from the oil-wet matrices due to the lack of water imbibition. Previous studies have shown that changing the wettability of rock would critically increase the oil recovery efficiency. This could be achieved by the low-salinity water injection method. In recent years, extensive studies have been conducted on this technique to evaluate its effectiveness for various types of oil reservoirs. Simultaneous injection... 

    Dynamic Simulation of Wettability Alteration Induced by Low-Salinity-Effect: Study of Phenomena within Thin Water Film

    , M.Sc. Thesis Sharif University of Technology Pourakaberian, Arash (Author) ; Mahani, Hassan (Supervisor) ; Joekar Niasar, Vahid (Co-Supervisor)
    Recent experimental studies have demonstrated that the lowering of brine could alter the wettability of the oil-brine-rock systems from an oil-wetting state toward a more water-wetting state. This so-called “Low-salinity effect” (LSE) is one of the main effects of the enhanced oil recovery technology based on low-salinity waterflooding. “Double layer expansion” (DLE) in the thin brine film is proposed as the principal mechanism of this phenomenon. Nonetheless, the role of the electrical behavior of the oil/brine and rock/brine interfaces on the kinetics and dynamics of this process is not well understood. Moreover, since most of the previous works have either dealt with a thin film at... 

    Pore-scale Modeling and Simulation of Low Salinity Waterflooding (LSWF) with OpenPNM

    , M.Sc. Thesis Sharif University of Technology Abdollahi, Saeed (Author) ; Mahani, Hassan (Supervisor) ; Ayatollahi, Shahabodin (Supervisor) ; Sadegh Nejad, Saeid (Co-Supervisor)
    The Low salinity water flooding is one of the important methods of secondary and tertiary oil production in which many expert petroleum-production engineering working on it in recent two decades. There are some basis mechanisms for low salinity method presented in the literatures including fine migrations, alkaline flooding, multicomponent ionic exchange, electrical double-layer expansion and pH-driven wettability alteration. The main approach is generating low salinity mechanism especially wettability alteration in OpenPNM framework. OpenPNM is a python base framework developed by Jeff Gostick for porous media modeling. OpenPNM has paved the way for extracting pore network models (PNM) from... 

    Experimental Investigation and Modeling of Flow ّunction Variation in Enhanced oil Recovery Using Low Salinity/Smart Water Injection in a Carbonate Reservoir

    , Ph.D. Dissertation Sharif University of Technology Farhadi, Hamed (Author) ; Ayatollahi, Shahaboddin (Supervisor) ; Fatemi, Mobin (Supervisor)
    Low salinity water flooding (LSWF) as an efficient enhanced oil recovery (EOR) technique is proved to affect both, fluid-fluid and rock-fluid interactions to potentially release the trapped oil from the porous rock. Despite more than one decade of extensive research works on the low salinity water effect (LSWE), there are still many parameters to be studied for very complex cases. Therefore, in the first part of the experimental study of the dissertation, a systematic investigation on the effect of the initial wetting state (water-wet or oil-wet) of pure calcite is conducted to study the importance of fluid/fluid and fluid/rock interactions for LSWE investigation. In the case of initially... 

    Coupling Flow and Geochemistry for Numerical Simulation of Low Salinity/Smart Waterflooding in Carbonates

    , M.Sc. Thesis Sharif University of Technology Alipour, Sina (Author) ; Ayatollahi, Shahab (Supervisor) ; Mahani, Hassan (Supervisor)
    Due to the decrease in oil reserves in the world, increasing population and the growing demands for oil consumption in the world, increasing the oil recovery from oil reservoirs has become more important. Increasing the amount of oil production efficiency by using low salinity water/modified salinity water has been highly appreciated during the last two decades. Low-salt water is a new method, due to its advantages such as low cost, simplicity of operation and low environmental hazards. It is believed that low salinity water can alter the rock wettability from a more oil-wetting state to a more water-wetting state. In order to be able to predict the performance of low salinity water... 

    Experimental Investigation of Surface Properties and Wettability Using Super Gas Wetting Surface Modified Multi-Nano-Composites

    , M.Sc. Thesis Sharif University of Technology Shayesteh, Mohammad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Fakhroueian, Zahra (Supervisor)
    Recently, the researchers try to identify the application of nanofluids for wettability alteration. Changing the wettability of reservoirs, which gas injects to them, to gas wet can lead to enhanced oil recovery. Although several studies have been conducted to introduce proper nanofluids for altering the wettability of reservoirs to gas wet, there is not enough study to investigate the application of nanocomposites for wettability alteration of carbonate reservoirs. In this study, 20 nanoparticles with different compositional structures were synthesized, and then various nanofluids were prepared for the experimental survey. Also, the potential of these nanofluids for wettability alteration... 

    Investigating the Role of Nanoparticles and Chemicals on Wettability Alteration of Carbonate Rocks to Gas-Weting Condition and Analysis of Hystertic Behavior

    , M.Sc. Thesis Sharif University of Technology Azadi Tabar, Mohammad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    The purpose of this study was to investigate the experimental and modeling of the drop formation process on calcite rock and calcite aged in nano fluid surfaces in order to analyze size dependent contact angle and wettability modification. To do this, the calcite surfaces were prepared by cutting to an approximately size of 3*3*0.4 cm and grinded and polished to achieve different roughnesses. The purity and roughness of the samples were determined by X-ray diffraction and atomic force microscopy, respectively. In order to conduct the dynamic and static contact angle measurements on the calcite surface in vapor saturated condition, a small laboratory device was designed. The advanced contact... 

    Wettability Altration Determination by Using Streaming Potential

    , M.Sc. Thesis Sharif University of Technology Esmaeili, Sajjad (Author) ; Massihi, Mohsen (Supervisor) ; Ayatollahi, Shahabodin (Supervisor)
    The assessment of fluid transport in porous media is the main subject in oil reservoirs to understand the oil recovery efficiency. The efficiency of Enhanced oil recovery (EOR) processes depends on the surface properties and wetting behavior of oil reservoir rocks which are also affected by the electrokinetic behavior of solid part of the porous rock. Streaming potential measurement is one of the techniques to determine the electrokinetic properties. The streaming potential measurements using electrodes have recently been introduced in oil field applications and there are still significant uncertainties during the measurements and interpretation of streaming potential results. The Primarily... 

    Experimental and Modeling Investigation of Wettability Alteration to Gas Wetting Condition in Gas Condensate Reservoirs

    , M.Sc. Thesis Sharif University of Technology Erfani Gahrooei, Hamid Reza (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    During production from gas condensate reservoirs, reservoir pressure decreses to lower than dew point pressure of the reservoir fluid. Consequently, condensates will form in near wellbore regions, which significantly decrease well productivity. One of the remediations that is recently proposed for solving this problem is wettability alteration of near wellbore region to gas wetting condition. In comparison to other methods, it provides a better permanency, which is its key advantage. The main purpose of this thesis is, quantitative, qualitative and modeling study of wettability alteration of rock to gas wetting condition and verification of modeling rsults for a reservoir rock sample. Also,... 

    Experimental Investigation of Mechanism of Wettability Alteration Induced By Hot Water and Steam Injection

    , M.Sc. Thesis Sharif University of Technology Salehi, Afshin (Author) ; Masihi, Mohsen (Supervisor)
    One of the most important production mechanisms of fractured reservoirs is wettability alteration. Since most fractured reservoirs are carbonate, and thus are often oil-wet; production of these reservoirs is facing their special challenges. Since most of our country reservoirs are fractured carbonate type, determination of the exact mechanisms of their production is necessary. Thermal EOR methods traditionally have been welcomed by big oil companies. Also, these methods of enhanced oil recovery techniques, have a much greater share in the production history of all EOR methods, rather than other EOR methods. Exponentially decreasing of oil viscosity on heating, is the main reason for using... 

    Janus Silica Nanoparticles and Their Application for Enhanced Oil Recovery

    , M.Sc. Thesis Sharif University of Technology Behzadi, Abed (Author) ; Mohammadi, Ali Asghar (Supervisor)
    Nanoparticles can be applied as chemical agent in enhnaced oil recovery like surfactants and polymers. One of nanoparticles usefull capabilities is modification of their surface. This research investigates this capabilty of nanoparticles in enhanced oil recovery. Surface modification of nanoparticles with both agents can bring new abilities to these materials. Here surface of silica nanoparticles is modified by hydrophilic agent comprising PEG groups, hydrophobic agent comprising propyl group and both agents. FT-IR tests showed that grafting of modifiyng agents on surface of nanoparticles is well done. To investigate effect of nanoparticles surface modification on nanoparticles capability in... 

    Investigating Wettability Alteration During MEOR Process

    , M.Sc. Thesis Sharif University of Technology Soleymani, Fatemeh (Author) ; Ayatollahi, Shahab (Supervisor) ; Kariminia, Hamid Reza (Supervisor)
    Microbial enhanced oil recovery (MEOR) is a collection of techniques that utilize microorganisms and their metabolic products to improve the recovery of crude oil from reservoir rock. From the advantages of this method, independency to the oil price and environmental benign can be mentioned. Many mechanisms have been proposed to contribute on MEOR, but still there is no enough knowledge about the mechanisms that causes inabilities in manipulating the process to get more oil production.
    In the present study, the effect of a native type of bacteria, Enterobacter cloacae, on the glass surfaces wettability which were aged in expose of model oil with different asphaltene concentration was...