... Abstract There are different thermodynamic models that have been applied for modeling of asphaltene precipitation due to various reasons, such as CO 2 injection, mixing of different oils in oil storage and pressure changes. In this work, two computer codes which are based on two different...

... situations even without the fluid flowing. However, during flow, the dynamic surface deposition is predominant. The plugging deposition may occur under certain conditions, depending on properties of the fluid, porous media, asphaltene precipitates, injection rate and pressure conditions. In addition...

... Abstract Accurate modeling of the asphaltenes precipitation from asphaltenic crude oil is essential in order to possible preventive and curative measures for the potential problem of asphaltene deposition occurring during oil production, transport and refining operations. Available...

... Abstract Many recent investigations showed that the prevalent thermodynamic models are incapable of predicting asphaltene precipitation without extensive data fitting. This is primarily due to lack of knowledge of the asphaltene properties, its complex nature and the large number of parameters...

... has been used, and the asphaltene precipitation amount due to pressure reduction and CO 2 injection processes were measured for one of the Iranian heavy crudes. The molecular weight distributions of asphaltene in liquid phase at different gas compositions as well as total asphaltene content were...

... Abstract Asphaltene precipitation and deposition is a serious problem in many Iranian fields. The deposited asphaltene results in partial or total blockage of the wellbore, reducing or completely seizing oil production. This paper presents a new approach, based on PVT data, for thermodynamic...

... viscosity and leads to production of upgraded oil. However, the precipitated asphaltenes can also plug the pores of the formation and cause severe damage to the permeability. The objective of the current work was to determine whether the beneficial effects of asphaltene precipitation will outweigh any...

... Abstract When a hydrocarbon solvent is made in contact with a heavy oil under a sufficiently high reservoir pressure, asphaltene precipitation occurs so that the heavy oil is in-situ upgraded during a solvent-based heavy oil recovery process. Some physicochemical properties of this in-situ...

... an upper horizontal well) to reduce the viscosity of the heavy oil via mass transfer. vapex process drainage vapex hybrid vapex waterloo experiment interface asphaltene precipitation heavy oil production rate proceedings sagd viscosity steam-solvent combination gravity drainage...

... start to form and directly related to the oil chemical physical stability. Modeling of asphaltene precipitation in the reservoir porous media and in the oil well tubing of an Iranian south oilfield is the purpose of this study. For the reservoir, the modeling technique based on the representation...

... Abstract Asphaltenes precipitation is one of the major operational problems affecting oil production in the Bangestan reservoir in south of Iranian fields. Precipitation of asphaltenes in reservoirs, wells and production facilities can have severe detrimental impact on the economics of oil...

... modified equation of state and willapplied in Flory-Huggins (FH) model to predict of asphaltene precipitation during solvent titration in heavy oil. At the second stage the Flory-Huggins (FH) model is modified by three adjustable parameters (a, b, c) topredict asphaltene precipitation more accurately...

.... Specifically, a numerical model can predict the performance of the process, especially the occurrence and effect of asphaltenes precipitation during the ‘upgrading’ process. This research proposes an alternative approach to simulate numerically the asphaltene precipitation effect of the VAPEX process...

... process is also based on a paraffinic solvent. To optimize these processes, data is required on asphaltene precipitation from heavy oils or bitumens diluted with n-alkanes. In this work, the onset and amount of asphaltene precipitation from Athabasca bitumen were investigated in a PVT cell using three...

... Abstract This paper describes the incorporation of asphaltene deposition and geochemistry in the simulation of CO 2 floods. The asphaltene deposition model includes reversible and irreversible asphaltene precipitation followed by surface deposition and pore-throat plugging. Simulation runs...

... effective. In order to better mitigate asphaltene deposition, a better understanding of asphaltene precipitation and flocculation is required. This project focuses on the formation and flocculation of asphaltene particles in solutions of n-heptane and toluene at 23 °C and atmospheric pressure. Heptane...

... Abstract The onset and reversibility of asphaltene precipitation from Athabasca and Cold Lake bitumens were investigated over a range of temperatures and pressures in a mercury-free PVT cell. Asphaltenes were precipitated from bitumen with the addition of n-heptane and they were re-dissolved...

... sedimentation particle diameter oilfield chemistry crude oil asphaltene formation depressurization asphaltene particle wax remediation asphaltene precipitation hydrate remediation wax inhibition scale inhibition asphaltene remediation hydrate inhibition remediation of hydrates paraffin...

... and gas production is well known. In a gas condensate reservoir, liquid drops out of the reservoir fluid below the dew point and is left unrecovered 1 . In an undersaturated black oil reservoir, the appearance of a gas phase results in low recovery 1,2 . Wax and asphaltene precipitation, two examples...

... Abstract This paper describes important features of an equation of state compositional simulator that are required for the simulation of the Vapex process: asphaltene precipitation and fluid mixing by molecular diffusion and convective dispersion. The asphaltene precipitate...