Shahin Kord

Petroleum University of Technology | PUT · Ahvaz EOR/IOR Center

Predicting and analyzing the dynamic and reactive behavior of confined fluids at the pore scale, especially in heterogeneous porous media with multi-physics phenomena, is one of the vital challenges in the energy industry and has found great interest among researchers in various fields. In this paper, various physics of the Lattice Boltzmann method...

One of the procedures to measure the surface and interfacial tension (ST and IFT) is pendant drop tensiometry which has distinguished drawbacks to determine the ultra-low interfacial tension. The main drawbacks of previous pendant drop procedures were incapacitation for the drop formation at ultra-low IFT values, inability to provide a suitable pho...

Spontaneous imbibition is a key mechanism of oil recovery in naturally fractured reservoirs. Many enhanced oil recovery techniques, such as modified salinity brine injection, have been suggested to improve spontaneous imbibition efficiency. To predict oil recovery by spontaneous imbibition process, scaling equations have been developed in the liter...

As more and more oil recovery scenarios use seawater, the need to identify the possible mechanisms of wettability state changes in oil reservoirs has never been greater. By using molecular dynamics simulations, this study sheds light on the effect of ions common to seawater (Ca2+, K+, Mg2+, Na+, Cl-, HCO3-, SO42-) on the affinity between silica and...

Emulsions can have both undesirable and desirable possibilities based on stability and instability to decrease or improve the oil recovery and also water treatment. Hence, it is crucial to attaining an appropriate procedure to extract the oil from emulsions as one of the major barriers in petroleum industries. The ionic liquids (ILs) deployed as a...

In Archie's formula, cementation factor (m) is an important parameter that plays a key role in calculating fluid saturation and characterizing reservoir. Rock geometrical attributes, e.g. electrical tortuosity, particle's specific surface area, packing index, effective cross-sectional area, and porosity, considerably affect m. Natural heterogeneiti...

Polymer flooding is one of the most well-known research interests in the enhanced oil recovery (EOR) due to the excess oil production and limited petroleum reserve. In the presented study, a hydrophobically modified copolymer consisting of acrylamide and styrene (HSPAM) was produced via inverse emulsion polymerization as a wettability modifier and...

Rock typing with its various applications reduces the required time and cost for petrophysical analysis by categorizing similar rocks into distinct groups. Rock typing is divided into different categories, one of which, is electrical rock typing. An application of static electrical rock typing is cementation factor prediction which significantly af...

Wettability is a key factor controlling the flow of fluids, solutes, heat and electrical current in porous media, and therefore it is important in studies of various processes including CO2 storage, secondary and tertiary oil recovery, as well as the displacement of water and nonaqueous phase liquid (NAPL). Although Amott-Harvey and USBM are conven...

As a key parameter in the calculation of fluid saturation, cementation factor (m) is routinely approximated using the Archie’s equation. Numerous correlations and several techniques have been proposed to determine cementation factor, one of which is electrical rock typing. Besides hydraulic rock typing, which plays a significant role in modeling an...

A reliable method for selecting the most suitable Enhanced Oil Recovery (EOR) method is of a high necessity in reservoir engineering. Machine Learning (ML) techniques have been widely adopted as an effective and fast approach in primary stage of EOR screening. This paper presents a step-by-step procedure of applying ML in EOR screening with focusin...

In this paper, the performance of three imidazolium-based ionic liquids (ILs) including 1-hexyl-3-methylimidazolium chloride ([HMIM][Cl] or IL6), 1-octyl-3-methylimidazolium chloride ([OMIM][Cl] or IL8), and 1-dodecyl-3-methylimidazolium chloride ([DMIM][Cl] or IL12) in reducing the interfacial tension (IFT) between crude oil and IL solutions was a...

Residual or capillary trapping is an important mechanism of CO2 trapping in underground porous media. Recent experimental investigation has shown that relative permeability and capillary pressure are function of saturation changing direction or hysteresis phenomenon in addition to the saturation and hysteresis leads to irreversible change in relati...

Three decades has passed since the introduction of smart water injection in carbonate rocks; however, use of diluted seawater (dSW) and its associated mechanisms are not yet well understood. Several mechanisms have been introduced in the literature for increased productivity of low salinity water injection. In this study, coreflooding tests were co...

Low salinity/Smart water injection (LSWI) is a promising enhanced oil recovery (EOR) method, where manipulating the injected water compositions helps in recovery from oil reservoirs via alteration of the rock wettability towards a more water-wet state. The geochemical interactions involved in this process are crucial in determining the wetting stat...

The synergy between smart water and a thermoassociated copolymer consisting of acrylamide and styrene, poly(AM-co-St), called HSPAM, as a newly synthesized copolymer applicable under harsh reservoir conditions, was investigated for the first time as a promising candidate for enhanced oil recovery (EOR) purposes. In the first part of this study, a s...

Production of oil from carbonate reservoirs has always been challenging. The nature of these reservoirs is complex and heterogeneous, and the rock matrix often has low permeability and unfavorable wettability. Hence, waterflooding as the primary method for enhanced oil recovery (EOR) usually results in low recovery in non-water-wet carbonate reserv...

Thermal conductivity is defined as the ability of a material to conduct the heat. Rock thermal conductivity is influenced by several parameters such as mineral composition, geometrical factors, porosity, and saturation condition. Value of the rock thermal conductivity is necessary in all thermal processes in petroleum engineering such as thermal me...

Fluid saturation in a hydrocarbon reservoir is the most significant parameter in evaluating reservoir resources. The possibility of developing a field completely depends on hydrocarbon saturation, which is normally obtained by well-known Archie's equations. Accurate determination of the hydrocarbon saturation depends on the precise estimation of th...

Asphaltene deposition during enhanced oil recovery (EOR) processes is one of the most problematic challenges in the petroleum industry, potentially resulting in flow blockage. Our understanding of the deposition mechanism with emphasis on the rate of the asphaltene deposition is still in its infancy and must be developed through a range of experime...

Up to now, a large number of studies revealed that smart waterflooding is a cost-effective method by considering the effect of potential determining ions (PDI) on enhanced oil recovery (EOR) in the carbonated reservoir. Current research studied the symbiotic effect of different ions concentration (SO4²⁻, Mg²⁺, and Ca²⁺) template in smart water with...

One of the serious problems in the oil industry is precipitation and deposition of asphaltenes in the different oil production stages including formation, wellbore, production tubing, flow lines, and separation units. This phenomenon causes a dramatic increase in the cost of oil production, processing, and transferring. Thus, it seems to be very ne...

The perturbed-chain version of Statistical Association Fluid Theory (PC-SAFT) emerged as a powerful tool to study the phase behavior of complex fluids such as polymers and asphaltene. In spite of this, it has not gained widespread acceptance in the industry because of its sophisticated oil characterization procedure. In fact, the predictive perform...

One of the major issues in the oil industry is asphaltene precipitation. Modeling asphaltene precipitation is still considered as a complex problem due to various characteristics of different heavy components existing in the crude oil. Thermodynamic models have been found as accurate models for studying asphaltene precipitation in the past few year...

Smart water application in carbonate reservoirs has been recently gained a lot of attention by researchers as a low-cost enhanced oil recovery (EOR) method. In this study, for the first time, the behavior of different smart waters in the absence and presence of TiO2 nanoparticles (NPs) has been investigated by analyzing their effect on wettability...

Smart water application in carbonate reservoirs has been recently gained a lot of attention by researchers as a low-cost enhanced oil recovery (EOR) method. In this study, for the first time, the behavior of different smart waters in the absence and presence of TiO2 nanoparticles (NPs) has been investigated by analyzing their effect on wettability...

Improving the crude oil properties can solve serious operational problems in oil production and reduce production costs. In this study, the possibility of improving the quality of an Iranian heavy crude oil sample using two asphaltene degrading bacterial consortiums was investigated. So, two bacterial consortiums were isolated from oil contaminated...

Asphaltene precipitation and subsequent deposition on the rock surface during natural depletion and Enhanced Oil Recovery (EOR) methods are two challenging flow assurance issues, causing a sudden decline in oil production. Different precipitation mechanisms and absence of an appropriate generalized characterization parameter have questioned the pre...

Rock typing is an important tool in evaluation and performance prediction of reservoirs. Different techniques such as flow zone indicator (FZI), FZI * and Winland methods are used to categorize reservoir rocks into distinct rock types. Generally, these methods are applied to petrophysical data that are measured at a pressure other than reservoir pr...

Surfactant assisted smart water injection is one of the areas of research interests in enhanced oil recovery. Simultaneous use of smart water and surfactants has drawn great attention in last decades. Majority of studies highlight co-injection of cationic surfactant and sea water/low salinity water. Therefore, this paper opens a new approach by exa...

Asphaltene precipitation during natural depletion and enhanced oil recovery (EOR) methods is one of the problematic challenges, which can affect the production in oil reservoirs. Asphaltenes as the most surface-active agents in the crude oil can interfacially interact with water molecules. As asphaltenes absorb to oil/water interface, water potenti...

Applied Well Testing: A Comprehensive Guide to Concepts and Interpretation Techniques. In persian language

Chemical-assisted waterflooding enhances the ultimate recovery of a conventional waterflooding process through several mechanisms such as reducing interfacial tension between water and oil, formation of in-situ emulsions, treatment of adverse mobility ratio, and wettability modification. Application of chemical-assisted waterflooding for recovery o...

According to the undeniable needs for economical enhancement of oil production, special attention is paid to water based supplementary oil recovery methods. Besides, combination of modified sea water (SW) and chemicals, is taken into further investigations. In laboratory scale, most of the findings are related to the impact of smart water or chemic...

Focus on the molecular scale of low salinity brine effects seems to be necessary to clarify the possible mechanisms of carbonate rock wettability alteration. This study aimed at investigating the effects of different operational parameters such as pH, salinity and types of ions on wettability alteration (WA) during low salinity brine injection as a...

Microbial Enhanced Oil Recovery (MEOR) is a term which is attributed to the process of utilizing bacterial activity for increasing the recovery factor of oil reservoirs. This process relies on several mechanisms especially interfacial tension reduction and wettability alteration mechanisms. The main purpose of this work is to evaluate the impact of...

Emulsion application in Enhanced Oil Recovery (EOR) processes is a common and practical subject in petroleum industry. Considering a chemical use limitation, understanding of how much a chemical could be able to improve other chemical performance is very important. In the present article, the coincident impacts of nanoparticles, salts and surfactan...

The main problem during field scale implantation of low salinity water injection (LSWI) is the decline in injectivity versus time. Moreover, the actual mechanisms that result in incremental oil recovery are not completely known. In previous studies, the geomechanical effects have not been considered, and pore volume changed while bulk volume is sti...

As a physiochemical property, asphaltenes are known to be one the most surface active compounds ‎in crude oil. Due to such property, their behavior is most probably influenced by Fluid-Fluid ‎interactions at the contact surface (interface). Potentially and naturally in most of the cases, water is ‎in contact with crude oil and co-produced with it a...

Application of polymers and nanoparticles has been suggested by several researchers as a chemical enhanced oil recovery (EOR) agent in carbonate reservoirs each of which has a specific influence on the reservoir rock and fluid properties. However, the high salinity of the reservoir condition along with high temperature has a detrimental effect on t...

Oil industry suffers from flow assurance problems that occur both in upstream and downstream operations. One of the common flow assurance issues arises from precipitation and deposition of asphaltenes in various locations along the oil production path including near wellbore region in the reservoir, production tubing, flowlines and separation unit...

As the energy demand of the world is increasing, the interest toward more oil production is also increasing. Naturally, reservoirs produce hydrocarbons to a maximum 20 % of total oil in place. This means that further production will only be possible through an Enhanced Oil Recovery (EOR) strategy. Water flooding has been recognized as the most popu...

In this study, it has been tried to investigate the effects of pressure, asphaltenes/resins type and concentration, on interfacial properties of oil and water. Extensive sets of IFT tests between two crude oil samples and water were performed at various pressures. Synthetic crude oils were also prepared with desired amounts of asphaltenes and resin...

Water injection is one of the most promising enhanced oil recovery (EOR) techniques, in which the incompatibility of injection and formation waters can lead to the risk of scale formation. Recently, several researchers have investigated different chemically scale inhibitors to minimize scaling precipitation, amongst which nanotechnology has been co...

Carbon dioxide miscible flooding is known as a very efficient and challenging enhanced oil recovery (EOR) method. Besides the high oil recovery efficiency, the asphaltene precipitation and deposition is believed to be triggered by a perturbation of the thermodynamic equilibrium present in the reservoir. Asphaltene deposition results in wettability...

Spontaneous Imbibition (SI) is in particular a very important mechanism for oil and gas recovery from matrix blocks in naturally fractured reservoirs. An analytical solution to the one-dimensional co-current spontaneous imbibition (COCSI) problem was proposed by Schmid et al. (2011). On the basis of this analytical solution, a set of scaling equati...

CO2 injection is considered as one of the proven EOR methods and is being widely used nowadays in many EOR projects all over the globe. The process of in situ displacement of oil with CO2 gas is implemented in both miscible and immiscible modes of operation. In some oil reservoirs, CO2 miscibility will not be attained due to fluid composition chara...

Although alkaline-surfactant-polymer (ASP) flooding has proven efficient for heavy oil recovery, the displacement mechanisms and efficiency of this process should be discussed further in fractured porous media. In this study, several ASP flooding tests were conducted in fractured glass-etched micromodels with a typical waterflood geometrical config...

Reservoir simulation is an integrated tool for predicting reservoir performance and proposing development plans. However, in the master development plan (MDP) proposed based on the simulation results, there is always an associated risk that must be minimized. This risk arises from many different sources, one of which is the complexity in petroleum...

Asphaltene precipitation/deposition have been longstanding issues in petroleum industry which lead to decline in oil production and economical efficiency. Owing to severe undesirable issues associated with this phenomenon, it is crucial to develop a reliable, accurate, and robust approach for quantitative estimation of asphaltene precipitation. In...

Although Alkaline-Surfactant-Polymer (ASP) flooding is proved to be efficient for heavy oil recovery, the displacement mechanisms/efficiency of this process should be discussed further in fractured porous media especially in typical waterflood geometrical configurations such as five-spot injection-production pattern. In this study, several ASP floo...

It is well known that the simple methods are not accurate for estimating the water content of acid gases, which includes carbon dioxide, because CO2 exhibits a minimum in the water content which cannot be predicted accurately by existing methods. In the present study, particle swarm optimization (PSO) was coupled to artificial neural network (ANN)...

This paper presents an experimental investigation of gas-assisted gravity drainage (GAGD) performance while taking into account the effects of asphaltene deposition. The experiments were conducted at high pressures and high temperature (15-37 MPa and 102 degrees C) using carbonate cores and real reservoir fluids in the absence of water saturation....

As the application of enhanced oil recovery (EOR) mechanisms expands globally, a vast amount of information is reported annually and many statistical works are carried out aiming mostly at the feasibility study of employing EOR methods for candidate reservoirs. In the last decades, researchers have gathered huge databases and used various technique...

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, it is called electromagnetic (EM) heating. The ap...

The complicated nature of asphaltene molecules besides the unknown mechanism of phase separation of asphaltene-containing systems as well as lack of a suitable characterization parameter has questioned the generality of the available thermodynamic models.The scaling equation developed by Rassamdana et al. 0050 and 0065 and its generalized form pres...

Oil production from asphaltenic oil reservoirs has always encountered difficulties, such as plugging and unpredictable fluid properties. To physically recognize the aspects of asphaltene deposition, several dynamic and static asphaltene deposition tests were designed and performed on one of the giant south Iranian oil reservoirs using dead and live...

To achieve the best simulation model, fluid thermodynamic modeling and reservoir fluid characterization are basic steps, in which laboratory data should be validated and matched with a proper model. A proper fluid model can avoid expensive PVT experiments. In this paper, a case study is presented using PVT properties of live fluid samples obtained...

Studying PVT properties of the reservoir fluid could deliver valuable information from which the connectivity of the reservoir could be investigated. The source, from which the reservoir has been fed, is also of the information acquired by fluids study. In this paper, a case study is presented using PVT data of 17 fluid samples obtained from 13 wel...

Carbon dioxide miscible flooding has become a popular method for Enhanced Oil Recovery (EOR) because it not only efficiently enhances oil recovery but also considerably reduces green house gas emissions. However, it can significantly cause asphaltene deposition, which leads to serious production problems such as wettability alteration, plugging of...