Integrated Analysis of Asphaltene Deposition from Field Production Data and Laboratory Experiments

Mohammed, Sabry A.; Arisaka, Kazuyoshi; Kumazaki, Yoshito

doi:10.2118/49501-ms

Cited by 2 publications

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“…Both asphaltenes and resins are heavy aromatics and form the most polar parts of crude oil. The MW of asphaltene is generally higher than MW of resins (Mohammed et al, 1996). The fraction of crude oil precipitated by propane (C 3 ) may be liquid especially at high reservoir temperatures but the fraction precipitated by n-heptane (n-C 7 ) is solid (Jamaluddin et al, 2001).…”

Section: Definition Of Asphaltenesmentioning

confidence: 99%

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Asphaltene precipitation and deposition in the near wellbore region: a modeling approach

Almehaideb

2004

Journal of Petroleum Science and Engineering

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Section: Definition Of Asphaltenesmentioning

confidence: 99%

“…Together, asphaltenes and resins are sometimes called Asphalt. Asphaltene occurs naturally in crude oil in the range of 0-60% with most crude less than 10% (Mohammed et al, 1996). The ratio of asphaltenes to resins is around 1:1 -1:20 for stable crude, while for unstable crudes it is usually less than 1:1.…”

Section: Definition Of Asphaltenesmentioning

confidence: 99%

Asphaltene precipitation and deposition in the near wellbore region: a modeling approach

Almehaideb

2004

Journal of Petroleum Science and Engineering

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“…Resins are known as the fraction of crude oil that is soluble in n-heptane but insoluble in propane. Resins have lower molecular weight compared to asphaltenes [14], however both of them are considered as polar heavy aromatics. The ratio of asphaltenes to resins for stable crude is approximately more than 1:1 while for the case of lower than this ratio, the crude oil is unstable in terms of asphaltene solubility, and asphaltene tends to precipitate.…”

Section: Introductionmentioning

confidence: 99%

Multiphase flow modeling of asphaltene precipitation and deposition

Tabzar

Fathinasab²,

Salehi

et al. 2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Asphaltene precipitation in reservoirs during production and Enhanced Oil Recovery (EOR) can cause serious problems that lead to reduction of reservoir fluid production. In order to study asphaltene tendency to precipitate and change in flow rate as a function of distance from wellbore, an equation of state (Peng-Robinson) based model namely Nghiem et al.’s model has been employed in this study. The heaviest components of crude oil are separated into two parts: The first portion is considered as non-precipitating component (C31A+) and the second one is considered as precipitating component (C31B+) and the precipitated asphaltene is considered as pure solid. For determination of the acentric factor and critical properties, Lee-Kesler and Twu correlations are employed, respectively. In this study, a multiphase flow (oil, gas and asphaltene) model for an asphaltenic crude oil for which asphaltene is considered as solid particles (precipitated, flocculated and deposited particles), has been developed. Furthermore, effect of asphaltene precipitation on porosity and permeability reduction has been studied. Results of this study indicate that asphaltene tendency to precipitate increases and permeability of porous medium decreases by increasing oil flow rate in under-saturated oil reservoirs and dropping reservoir pressure under bubble point pressure. On the other hand, asphaltene tendency to precipitate decreases with pressure reduction to a level lower than bubble point pressure where asphaltene starts to dissolve back into oil phase. Moreover, it is observed that precipitation zone around the wellbore develops with time as pressure declines to bubble point pressure (production rate increases up). Also, there is an equilibrium area near wellbore region at which reservoir fluid properties such as UAOP (Upper Asphaltene Onset Pressure) and LAOP (Lower Asphaltene Onset Pressure) are constant and independent of the distance from wellbore.

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Integrated Analysis of Asphaltene Deposition from Field Production Data and Laboratory Experiments

Abstract: This paper was prepared for presentation at the 8th Abu Dhabi International Petroleum Exhibition and Conference held in Abu Dhabi, U.A.E., 11-14 October 1998.

Cited by 2 publications

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Asphaltene precipitation and deposition in the near wellbore region: a modeling approach

Asphaltene precipitation and deposition in the near wellbore region: a modeling approach

Multiphase flow modeling of asphaltene precipitation and deposition

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