... of the condensed solvent. The dissolution of solvent causes a composition change of bitumen, which can lead to asphaltene precipitation. The effects of the asphaltene precipitation have been studied as part of a solvent-based recovery process such as Vapor Extraction (VAPEX). One of the advantages...

... also conducted at high temperature and reservoir pressure to investigate the effect of solvent type and concentration on asphaltene precipitation. A Peng-Robinson Equation of State (PR-EOS) model was calibrated to measured data for CO 2 -, C 3 -, and C 4 -bitumen systems. Viscosity of the bitumen...

... camera along with a microscope was utilized to capture images. SEM analysis was also performed on precipitated asphaltene to visualize the difference in the structure of the asphaltenes precipitated with different solvents. Observation through this study revealed that besides the amount of asphaltene...

... Abstract The growing market for solvent-assisted recovery methods, such as ES-SAGD, SAP, and LASER, increases the risk of asphaltene precipitation in the reservoir and upstream facilities that would result in production loss and huge operational costs. A comprehensive study on the asphaltene...

.... oil sand SAGD enhanced recovery complex reservoir thermal method steam-solvent combination bitumen oil quality experiment recovery performance reservoir clay Upstream Oil & Gas viscosity oil saturation asphaltene Asphaltene Precipitation residual oil saturation Hascakir steam...

... economic and environmental advantages. chemical flooding methods Asphaltene Precipitation mechanism stability solvent injection matrix heavy oil enhanced recovery PEF sweep efficiency injection foam Oil Recovery Upstream Oil & Gas co 2 surfactant fracture carbonate reservoir...

... sand at 120°F and 1000 psi. The results showed oil recovery of 85 wt.% with increases of API up to 14°API for the produced crude oil. Using lab characterization data, a new asphaltene precipitation model was developed that involves four pseudo components to numerically simulate the lab experiments...

... that asphaltenes precipitate in the presence of n-hexane but are soluble in the presence of toluene ( Mullins 2008 ). Pore Displacement Efficiency Table 2 provides the pore displacement efficiency of the five experiments, for inside and outside steam chamber, calculated on the basis ofthe residual oil...

... solvent, the heavy oil production was enhanced through enhanced mass and heat transfer, as well as in-situ deasphalting through asphaltene precipitation. The heavy oil production rate was estimated to be more than 15 times higher in the N-Solv process than that in the conventional VAPEX process. The N...

... Abstract In situ bitumen recovery directly depends on the reduction of bitumen viscosity. Solvent injection is an alternative to thermal bitumen recovery by steam injection. Injection of solvents containing n-alkanes like butane, propane and naphtha may lead to asphaltene precipitation...

... & Gas viscosity Butler Canada SAGD Asphaltene Precipitation experiment Canadian Petroleum Technology Oil Recovery complex reservoir steam-assisted gravity drainage oil production bitumen injection bitumen steam-solvent combination es-sagd experiment Alberta toluene SAGD process oil...

... Abstract Solvent injection into heavy-oil reservoirs is quite complex on account of the asphaltene destabilization that occurs due to the changes in temperature, pressure, and solvent type dissolved in oil. As a result of this destabilization, the asphaltene precipitates, flocculates...

... Abstract Asphaltene precipitation and deposition can occur in some heavy oil reservoirs during the primary depletion or gas-lift process, when a pressure drop from the subsurface reservoir formations to the surface treating system is rather large. These precipitated asphaltenes may be deposited...