Experimental Study of Asphaltenes Flocculation Onset in Crude Oils Using the Densitometry Measurement Technique

Ekulu, Gédéon; Sadiki, A.; Rogalski, Marek

doi:10.1080/01932690903293867

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…This trend continues up to a maximum point after which both graphs began a downward trend until they reached the conductivity of a 100% precipitant phase. Using this method, one can also estimate the amount Reduced density of fluid FC {crude oil C (5 g) + cyclohexane (7.5 g) + n-heptane (X g )} as a function of the ratio of n-heptane and available crude oil (Ekulu et al 2010) of precipitated asphaltenes by extrapolating the data before precipitation to the point of pure precipitant. The detailed algorithm for this estimation is provided in the paper by Fotland et al (1993).…”

Section: Density Measurement Methodsmentioning

confidence: 99%

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A review on methods of determining onset of asphaltene precipitation

Soleymanzadeh

Yousefi

Kord

et al. 2018

J Petrol Explor Prod Technol

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Oil industry suffers from flow assurance problems that occur both in upstream and downstream operations. One of the common flow assurance issues arises from precipitation and deposition of asphaltenes in various locations along the oil production path including near wellbore region in the reservoir, production tubing, flowlines and separation unit at the surface. Asphaltene particles precipitate out of oil continuum due to changes in temperature, pressure or composition. Such changes in operating conditions occur during different recovery processes (natural depletion, gas injection, chemical injection, etc.) as well as production and blending of different oils during transportation. There are different experimental methodologies documented in the literature that describe how to determine onset of asphaltene precipitation. In this paper, a comprehensive review is performed on all the available procedures to measure onset of asphaltene precipitation. The advantages and limitations associated with all these methods are also documented.

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Section: Density Measurement Methodsmentioning

confidence: 99%

“…Reduced density of fluid FF {crude oil F (5 g) + cyclohexane (7.5 g) + n-heptane (X g )} as a function of the ratio of n-heptane and available crude oil(Ekulu et al 2010) …”

mentioning

confidence: 99%

A review on methods of determining onset of asphaltene precipitation

Soleymanzadeh

Yousefi

Kord

et al. 2018

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…This indicates that the initially existing asphaltene precipitates become more compact with no new asphaltene precipitates forming by the contact of methane. Methane acts as a solvent used in Ekulu’s research . Detailed structure changing needs to be studied in future work.…”

Section: Resultsmentioning

confidence: 99%

“…Methane acts as a solvent used in Ekulu’s research. 45 Detailed structure changing 46 needs to be studied in future work.…”

Section: Resultsmentioning

confidence: 99%

Quantification of Methane-Induced Asphaltene Precipitation in a Multiple Contact Process

et al. 2022

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A unique experiment design is proposed to study the asphaltene precipitation caused by multiple contact processes during gas injection. The newly proposed experiment quantified the asphaltene precipitation at different methane contact steps. Twenty times methane contacts and corresponding asphaltene precipitation states are measured using a light scattering setup under reservoir condition. The amount of the asphaltene precipitation, the composition changes, and the physical properties changes are measured for the 20 times methane contacts. After verifying the asphaltene precipitation in the static experiments, the formation damage caused by the asphaltene precipitation is studied by core flooding tests for three different permeability cases. We found that the primary asphaltene precipitation mechanism in the multiple contact process during methane injection is not the composition change caused by methane extraction. The methane-induced asphaltene stability loss during the multiple contact process is vital. The size and the structure of asphaltene precipitation particles in the crude oil change with the methane contacts. We found that the mechanism of permeability reduction caused by asphaltene precipitation is different depending on the porous media pore throat size and the asphaltene precipitation particle size. Under our experimental condition, the asphaltene precipitation acts as a conformance control method, leading to well-distance optimization considerations in field applications.

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Performance evaluation and improvement of PC-SAFT equation of state for the asphaltene precipitation modeling during mixing with various fluid types

Moghaddam

Jamshidi

2022

Fluid Phase Equilibria

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Experimental Study of Asphaltenes Flocculation Onset in Crude Oils Using the Densitometry Measurement Technique

Cited by 8 publications

References 6 publications

A review on methods of determining onset of asphaltene precipitation

A review on methods of determining onset of asphaltene precipitation

Quantification of Methane-Induced Asphaltene Precipitation in a Multiple Contact Process

Performance evaluation and improvement of PC-SAFT equation of state for the asphaltene precipitation modeling during mixing with various fluid types

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