An Experimental Approach of the Reversibility of Asphaltene Deposition under Dynamic Flow Conditions

Shedid, Shedid Ali; Abbas, El Abbas A.

doi:10.2118/92159-ms

Cited by 13 publications

(8 citation statements)

References 25 publications

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“…The nature and behaviour of asphaltenes in crude oils are known complicated [30]. Asphaltenes are arbitrarily defined as a solubility class of petroleum that is insoluble in light alkanes such as n-heptanes or n-pentane but soluble in toluene or dichloromethane [31,32]. Asphaltenes are arbitrarily defined as a solubility class of petroleum that is insoluble in light alkanes such as n-heptanes or n-pentane but soluble in toluene or dichloromethane [31,32].…”

Section: Definition Of Asphaltenementioning

confidence: 99%

“…This model assumes that asphaltenes dissolve in crude oil completely and form a uniform solution, in other word asphaltene dissolve in crude oil like other smaller hydrocarbons. Anderson (1992) and Clarke and Pruden ( 1996) indicated that the process of asphaltene flocculation and/or precipitation is not completely reversible [31]. The regular solution model assumes that asphaltene dissolves in crude oil similar to the small hydrocarbon molecules.…”

Section: State Of Asphaltene In Petroleummentioning

confidence: 99%

“…The heavier oil also contains plenty of intermediate components that are good asphaltene solvents whereas the light oil may consist largely of paraffinic materials in which, by definition, asphaltenes have very limited solubility. A low ratio of asphaltene to resin ratio implies good colloidal stabilization [31,32]. Asphaltenes in heavier oils can also cause problems if they are destabilized by mixing with other fluid during transportation or by other steps in oil processing or gas injection processes.…”

Section: Evaluating Asphaltene Stabilitymentioning

confidence: 99%

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Study of Asphaltene Precipitation and Deposition Phenomenon during WAG Application

et al. 2011

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Precipitation and deposition of heavy organic materials such as asphaltene inside reservoirs, processing and transportation facilities is a major concern in the oil industry. Asphaltene precipitation is one the most common problem in many reservoirs and unfortunately may lead to many safety operational issues that in end affect's oil recovery which assumes to be a major economical loss. The precipitation and deposition of asphaltene in porous media and their interactions with rock and fluids is a complex phenomenon which begs to be investigated under reservoir conditions. As yet, there have been many studies conducted on asphaltene precipitation but majority of them focused on determining precipitation onset point. It is believed, the first step in attempting to find an engineering solution to this deposition problem is to identify the conditions at which asphaltene precipitation takes place initially and conditions after that influences deposition. This paper presents an assessment of aspects that influences asphaltene precipitation and deposition. This research, attempts to understand the mechanism of asphaltene precipitation and deposition, parameters affecting the precipitation and deposition process, the effect of asphaltene precipitation and deposition on oil reservoir characteristics and performance. In addition, the research involves examining the existing thermodynamic models of asphaltene precipitation and deposition in porous media, reversibility of asphaltene precipitation and deposition, asphaltene deposition removal methods, and modelling and simulation of asphaltene by conventional simulators. Since this study is a comprehensive summary of the mentioned topics and contains all the essential information of asphaltene and its precipitation process, it therefore can be used as a reference for further exploration of this specialized field.The probability of asphaltene precipitation and deposition occurring during any EOR techniques and its effects on reservoir performance should be anticipated at earlier stages of any development project. Also it is believed that through a more comprehensive understanding of the mechanisms that lead to deposition in the first place; asphaltenes deposition if cannot be prevented fully may at least be controlled and managed.

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Section: Definition Of Asphaltenementioning

confidence: 99%

Section: State Of Asphaltene In Petroleummentioning

confidence: 99%

Section: Evaluating Asphaltene Stabilitymentioning

confidence: 99%

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Study of Asphaltene Precipitation and Deposition Phenomenon during WAG Application

et al. 2011

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“…However in practice, it may be assumed that steady-state is reached at 3τ, corresponding to some 95% of the final value. Shedid and Abbas (2005) monitored the concentration of deposited asphaltene with time in static experiments conducted on carbonate rocks. Their data, which exhibited a clear asymptote, can reasonably be approximated with a first-order model such as that presented in Eq.…”

Section: Dynamics Of a Closed Systemmentioning

confidence: 99%

“…Similarly, experimental procedures that involved following a forward-flooding operation with reverse-flooding are also taken to approximate a closed system (Kocabas, 2003). Additionally, the so-called static experiments, such as those reported by Shedid and Abbas (2005), whereby cores are first soaked in asphaltene solution then withdrawn to age, may also be classified as closed. Further example of static experiment was recently performed by Al-Huraibi and Belhaj (2010), in which an electrolytic cell was setup using graphite electrodes and asphalted crude oil.…”

Section: Introductionmentioning

confidence: 99%

Modelling Asphaltene-Induced Formation Damage in Closed Systems

Lawal

Vesovic

2010

Abu Dhabi International Petroleum Exhibition and Conference

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This paper implements a simple one-parameter semi-analytic model for asphaltene-induced reduction of porosity, pore-radius and permeability in closed systems. By treating sedimentation as the dominant deposition mechanism, dynamics of asphaltene deposition under "stagnant" conditions is provided, elucidating the dependence of damage rate on the size of asphaltene aggregates as well as rock and fluid properties. Parametric studies indicate that while the rate of formation degradation depends on rock and fluid properties, ultimate severity of impairment is primarily controlled by in-situ asphaltene content. The proposed model has been used to explain the general observation that light oil systems are more vulnerable to asphaltene damage, than the heavy oil systems. Validity of proposed model is demonstrated by comparing with available experimental datasets that include both sandstone and carbonates. In all cases, experimental results have been matched within 7% accuracy using the proposed model with a single adjustable parameter. Furthermore, thermal simulation studies conducted on a hypothetical but representative heavy oil reservoir highlight the detrimental effects of impairment on field-scale oil recovery and thermal efficiency. Both the models and results presented should be useful for studying impairments induced by asphaltene and other deposits.

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Reservoir impairment by asphaltenes: A critical review

et al. 2016

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Precipitation and deposition of asphaltenes and other organic substances in formation rock causes formation damage and reduces effective hydrocarbon mobility, which can result in significant production losses. The development of reliable experimental, analytical, and modelling methods improves the understanding of asphaltene‐induced formation damage and provides tools for preventing and/or controlling formation damage due to asphaltenes in oil‐bearing formations. To make further advancements in understanding asphaltene impairment, it is important to analyze the current state of technology and research in this area. In addition to analyses of known experimental data and models of reservoir impairment by asphaltenes, prospective directions of future research in this area are also suggested.

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An Experimental Approach of the Reversibility of Asphaltene Deposition under Dynamic Flow Conditions

Cited by 13 publications

References 25 publications

Study of Asphaltene Precipitation and Deposition Phenomenon during WAG Application

Study of Asphaltene Precipitation and Deposition Phenomenon during WAG Application

Modelling Asphaltene-Induced Formation Damage in Closed Systems

Reservoir impairment by asphaltenes: A critical review

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