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Determination of equilibrium composition for various multi-phase systems is important in the context of thermodynamics. Three methods are generally employed to calculate the gas/liquid equilibrium compositions; namely, empirical graphs, correlations, and equations of state (EOSs). Empirical graphs and correlations are simple and fast in terms of calculation procedure. Furthermore, using an EOS requires...
Minimum miscibility pressure (MMP) is one of the key parameters that affects the microscopic and macroscopic effectiveness (displacement performance) of gas injection for enhanced oil recovery. Numerous research efforts have been made to measure and predict the MMP, including experimental, analytical, numerical, and empirical methodologies. Despite these efforts, a comprehensive, user-friendly, and...
A phosphonium ionic liquid with glyceryl moiety was synthesized and used as an efficient extractant in the removal of sulfur compounds from a model liquid fuel. The effects of different parameters such as volume ratio, time, initial concentration, temperature and type of sulfur compound on the desulfurization efficiency were investigated. The reusability and the recyclability of the described ionic...
Finding optimum well locations is still among the most challenging reservoir engineering problems. Reservoir simulators are routinely used to evaluate different configuration of well locations in the reservoirs. However, simulation of giant field models is computationally demanding and time consuming. In the current study, a novel proxy with the objective function that is based on volumetric pressure...
The Parvadeh Coalfield located in the south of Southern Khorasan Province, with an area of 1200km2 is one of the most important coal producing areas in East-Central Iran and contain low to medium volatile bituminous coal (%Ro: 0.9–1.5%). The mineralogical and geochemical data of coals with respect to element partitioning during coal dressing indicated that the main minerals of feed coals are quartz,...
In order to increase the oil recovery factor from depleted sandstone reservoirs with low degree of pressure, implementation of chemical flooding is the technically known as a feasible solution. The polymer-surfactant flooding, as one of the main subsets of chemical flooding methods, is a vigorous Enhanced Oil Recovery (EOR) method which can be applied with a high level of performance in sandstone...
Understanding the time of water/gas breakthrough has a prominent role in cost effective oil production, improve oil recovery and extension the reservoir production time. The importance lies in the fact that once water or gas has broken through, the fluid distribution and the fluid relative permeabilities in the system will change. Accordingly, applying robust predictive models in this area to arrive...
Improving the recovery factor of conventional oil reservoirs is not a far-fetched target when injecting miscible gases is discussed in technical Enhanced Oil Recovery (EOR) plan. Considering the leading role that Minimum Miscible Pressure (MMP) factor plays in the scenario of a miscible gas injection, and the significant impact that it does have on the sweep efficiency of the injected gas is inevitable...
Production of acetone–butanol–ethanol (ABE) from potato waste starch using free and immobilized cells of Clostridium acetobutylicum was investigated. The starch was directly fermented to ABE by C. acetobutylicum without hydrolysis, and the results were compared with those obtained from glucose as a reference. Maximum butanol yields from waste starch and glucose were 0.21 and 0.26g/g of initial carbon...
Relative permeability of the petroleum reservoirs is a key parameter for various aspects of the petroleum engineering area like as reservoir simulation, history matching and etc. Due to this fact, various approaches such as experimental, theoretical and numerical approaches have been studied however; such experimental methods are time consuming, complicated and expensive. Based on the addressed disadvantages,...
Scale deposits impair production reservoirs and foul down hole, surface, and injection equipment. The effects can be rapid and dramatic. One of the most frequent scale-forming compounds in water is calcium carbonate. In a reservoir the production of brine can result in the lowering of the pressure and/or temperature. A pressure drop will decrease the solubility of CaCO3 and thus increase the saturation...
Raw natural gases are frequently saturated with water during production operations. It is crucial to remove water from natural gas using dehydration process in order to eliminate safety concerns as well as for economic reasons. Triethylene glycol (TEG) dehydration units are the most common type of natural gas dehydration. Making an assessment of a TEG system takes in first ascertaining the minimum...
Added values to project economy from condensate sales and gas deliverability loss due to condensate blockage are the distinctive differences between gas condensate and dry gas reservoirs. To estimate the added value, one needs to obtain condensate to gas ratio (CGR); however, this needs special pressure–volume–temperature (PVT) experimental study and field tests. In the absence of experimental studies...
To handle successfully the augmentation of energy consumption in the four corners of the world, there is an urgent need to produce more oil. Stagnant oil production and recovery unknowingly have made more risky by conventional methods. Therefore, Enhanced Oil Recovery (EOR) methods for producing more oil from the addressed oil reservoirs are being paid attention. Keep in mind that, after primary and...
Owing to water coning, water flows into the production wellbore from below the perforated channels and normally causes several technical issues in wellbore and surface production facilities such as separators. Knowledge about the time that water coning happens could help us greatly to plan the production scheme and overcome the addressed hurdles. Due to this fact, this research goes to great lengths...
To design gas condensate production planes with low uncertainty along with robust reservoir simulation, precise estimation or monitoring of dew point pressure play a crucial role. To handle successfully the addressed issue of condensate gas reservoirs, massive attentions have been performed previously but unfortunately fail to develop accurate approach for estimation dew point pressure. Dedicated...
The adsorption of surfactants on reservoir rock has been known from early studies on surfactant flooding for this purpose, Adsorption mechanism of new nonionic surfactant on carbonate rock surface is not yet reported in the literature. This paper describes adsorption of a new nonionic surfactant which extracts from Zizyphus spina christi onto porous real carbonate reservoir rock has been studied by...
Asphaltene precipitation affects enhanced oil recovery processes through the mechanism of wettability alteration and blockage. Asphaltene precipitation is very sensitive to the reservoir conditions and fluid properties, such as pressure, temperature and injected fluid molecular weight. In this work, the model based on a feed-forward artificial neural network (ANN) optimized by particle swarm optimization...
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