Asphaltene Precipitation From Bitumen Diluted With n-Alkanes

Akbarzadeh, Kamran; Sabbagh, O.; Beck, James S.; Svrcek, William Y.; Yarranton, Harvey W.

doi:10.2118/2004-026-ea

Cited by 22 publications

(12 citation statements)

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“…Deasphalting during solvent injection may occur through phase partitioning (precipitation) and subsequent deposition. It has been reported that asphaltene precipitation can be sensitive to temperature, pressure, solvent type, and solvent-oil ratio for given crude oil. , In our experiments, asphaltene precipitation is not expected to be very sensitive to pressure within the operating range . The deposition of the asphaltenic phase could occur in different places, including reservoir, wellbore flow lines or processing facilities.…”

Section: Discussionmentioning

confidence: 56%

“…The n -butane-to-oil ratio determines the dynamics of asphaltene behavior during liquid extraction under isothermal condition. Previous research has shown that the amount of precipitated asphaltenes and the size of asphaltene particles increase with the alkane-to-oil ratio. ,− As the alkane-to-oil ratio increases, asphaltene aggregation proceeds more rapidly and the amount of asphaltenes deposited on the surface increases. − …”

Section: Discussionmentioning

confidence: 99%

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Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

et al. 2018

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Steam-based EOR methods for viscous oil recovery from fractured reservoirs have significant challenges in both cost and energy efficiency. In response, solvent-based methods have been of interest because of their low energy intensity, low greenhouse gas emissions, and no fresh water consumption. Injection strategies for viscous oil recovery by solvent include liquid extraction and vapor oil gravity drainage. Understanding the mechanisms in each phase is of great value for the successful application and optimization of solvent EOR processes. The work presented here studies the effect of solvent injection rate on viscous oil recovery by liquid extraction with n-butane in vertically placed sandstone cores with an artificial fracture. The oil production rate, ultimate recovery, and in situ deasphalting in different sections of the core are analyzed. The oil production rate increased with solvent injection rate until it leveled off as the injection rate exceeded a critical value. The ultimate recovery factor is nearly the same for all solvent injection rates below the critical value. However, it is significantly reduced at higher injection rates. A conceptual model based on convective mass transfer is proposed and the effect of mechanical dispersion is discussed. In situ deasphalting was observed in all cases. The cause of the unexpected changes in production rate was attributed to severe asphaltene deposition and remobilization in the fractured permeable rock. In such a medium, solvent injection rate seems to show an optimal value for maximizing oil production rate, ultimate recovery factor, and solvent efficiency.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

et al. 2018

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“…Wen and Kantsaz [9] measured the viscosity of Cold Lake bitumen diluted with n-heptane at atmospheric pressure and ambient temperature (25°C) and correlated the data with Shu and Cragoe models. The onset of asphaltene precipitation and asphaltene yield have been evaluated experimentally by Akbarzadeh et al [10] and Wiehe et al [11]. Recently, Saryazdi et al [12] measured the density of n-heptane/bitumen mixtures at two different concentrations (15 and 30 weight percent) over temperature and pressure ranges, 20-175°C and 0.1-10 MPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

Modeling and measurement of thermo-physical properties for Athabasca bitumen and n -heptane mixtures

Nourozieh

Kariznovi

Abedi

2015

Fuel

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“…Akbarzadeh et al [30] concluded that Athabasca bitumen asphaltenes precipitation decreased as the temperature was increased. An experimental study of asphaltenes precipitation versus temperature performed by Escrochi et al [13] theoretically calculated that increase in temperature increases asphaltenes precipitation until the bubble point.…”

Section: Oil Composition Certain Components Of Crude Oilmentioning

confidence: 99%

How Do Thermal Recovery Methods Affect Wettability Alteration?

Punase

Zou

Elputranto

2014

Journal of Petroleum Engineering

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We will investigate the effect of temperature on wettability. First, we will list and summarize the different schools of thoughts from previous literature describing wettability changes for sandstone and carbonate reservoirs at elevated temperature. Next, we will describe the properties that affect wettability: how they alter wettability and how they are affected by temperature. After that, we will present indications of wettability changes and current wettability measurement techniques. Following this, case studies describing how wettability change influences reservoir characteristics and field performance during thermal recovery processes will be discussed. The thermal recovery methods included in the case studies were steam flooding, cyclic steam injection, hot water flooding, and in situ combustion. The main and very important take away from this study is that temperature induced wettability change is determined by many possible mechanisms combined together and not by just one or two phenomena occurring simultaneously. Finally, we will propose a reasonable scheme for wettability alteration during dry forward combustion, which needs further investigation.

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Asphaltene Precipitation From Bitumen Diluted With n-Alkanes

Cited by 22 publications

References 0 publications

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

Modeling and measurement of thermo-physical properties for Athabasca bitumen and n -heptane mixtures

How Do Thermal Recovery Methods Affect Wettability Alteration?

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