Sharif Digital Repository

Most of Iranian oil reservoirs, usually fractured carbonate, are in the end of primary or secondary recovery. Enhanced oil recovery methods are required for obtaining more performance from these resources. It seems to obtain more oil from reservoirs by flooding polymer after water flooding due to persistence of polymer effect, so the cost remain low. In this project, at the first the theory of water flooding and polymer flooding is described and after that we have done the following steps: •Injection of water into the plugs and calculate secondary recovery •Injection of polymer samples with 700 ppm concentration into the plugs •Injection of polymer samples with 1500 ppm concentration into... 

After primary and secondary recovery processes more than 50 percent of oil remains in reservoirs. Therefore for more recovery from these reservoirs, methods of enhanced oil recovery should be applied.In this paper the effect of nanoparticles of SiO2 in size of 14 nm, on wettability is investigated. Using this nanoparticle, the wettability of carbonate rock in reservoirs could be changed and alter from oil-wet or mix-wet to water-wet. To assess this, hydrophilic changes of sandstone core and carbonate core are studied using the contact angle test. The same test is done on the carbonate core saturated with brine and oil that had received injection with brine and nanoparticles of SiO2 with two... 

Because of a lot of water, gas and polymer injection processes in industry, two phase flow simulation is very useful. So performing experimental work to find out fluid flow behavior in a small scale of reservoir has special importance. The results in various scales will differ because of heterogeneity and different dominant flow regimes. To see this effects, comparison of two small scales, namely core and micromodel scales, has been studied using the scale up methods. In literature review, the scale up procedure, relative permeability methods and dimensionless numbers in two phase flows has been described. Here the relative permeability and oil... 

One of the three fundamental methods in reservoir evaluation is coring, other two methods are logging and well test. Coring is an operation during which, samples from formation rock are taken, and used for laboratory tests and examinations. Although coring presents exact information from reservoir rock, its small scale is the reason of some laboratory errors. This operation is fulfilled with special bits. Coring importance shines where it could give us an idea of reservoir conditions; however cannot be develop it, to all of the reservoir. Coring is used to identify rock properties like porosity, permeability, wettability and fluid properties like fluid density or fluid saturation. Rock... 

Carbonate reservoir acidizing is one of the most important well stimulation operations that has been widely used in recent years. Modeling the operation prior to any laboratory tests has always been one of the motivations of scientists in recent years due to the complexity of modeling to consider both mass transfer and reaction phenomena. There are several models have been proposed to simulate the acid injection process in carbonate rocks in recent years, the most important one is the Two-Scale Continuum Model (TSCM). This model utilizes the combination of Darcy-scale transfer and reaction equations and a series of pore scale relations to investigate acid injection into two-dimensional...