Effect of Asphaltene Deposition on Dynamic Displacements of Oil by Water

Kamath, V.A.; Yang, Jiede; Sharma, G. D.

doi:10.2118/26046-ms

Cited by 64 publications

(28 citation statements)

References 15 publications

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“…The continuous nature of the permeability reduction in flow experiments has been widely observed in the previous studies (Kamath et al, 1993;de Pedroza, 1995, Piro et al, 1995. However, two different views exist regarding the nature of this mechanism of permeability reduction.…”

Section: Introduction and Reviewmentioning

confidence: 70%

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

Shedid¹,

Abbas

2005

SPE Middle East Oil and Gas Show and Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractOccurrence of asphaltene deposition in producing formation constitutes one of the most serious problems currently encountered in the petroleum industry in many areas of the world. Reversibility of asphaltene deposition represents crucial argument and controversy in laboratory research of the petroleum industry. Deep understanding of this phenomenon is the key for treatment the problem of asphaltene deposition.

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Section: Introduction and Reviewmentioning

confidence: 70%

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

Shedid¹,

Abbas

2005

SPE Middle East Oil and Gas Show and Conference

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“…Figure 2 depicts the outputs of the thermodynamic model and its results compared to the experimental precipitation data. Then, the volume fraction of dissolved asphaltene may be converted to mass fraction by: (19) where W DA is the mass ratio of dissolved asphaltene in the liquid phase and l denotes the density of the liquid phase. …”

Section: Modeling Of Asphaltene Precipitation Processmentioning

confidence: 99%

“…A variety of phenomena happen as a result of asphaltene tendency for interaction with rock surface that ultimately results in alternation of hydraulic conductivity, interfacial tension, wettability and recovery efficiency (Kim, 1990;Kamath, 1993). Precipitation, flocculation, adsorption, mechanical entrapment, re-entrainment, flow of suspended particles by the oil stream and their surface deposition are all asphaltene related processes that may modify the properties of porous media.…”

Section: Introductionmentioning

confidence: 99%

Development of a Numerical Scheme for Simulation of Asphaltene Dependent Phenomena in Porous Media

Hematfar

Chen

Maini

2015

SPE International Symposium on Oilfield Chemistry

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Asphaltene is the highest molecular weight fraction of crude oil that under some conditions can undergo deposition and adsorption and affect the properties of porous media. This work presents a mathematical model for fractionation of asphaltene content of crude oil into different parts that evolve as a result of mechanisms like precipitation, flocculation, adsorption and entrapment during pressure depletion and solvent injection tests in core samples.A fully coupled numerical scheme that bundles all nonlinear partial differential equations (PDEs) and pertinent relations is developed to compute the distribution of these fractions and other properties with respect to time and space. Flow of suspended asphaltene particles in the oil phase is modeled and phase behavior properties are predicted by the Peng-Robinson equation of state. A thermodynamic equation is derived to calculate the solubility parameter as an indication of asphaltene stability in the flowing system. The pressure distribution along the core is determined by combining the mass balance equations for oil, gas and asphaltene components into one PDE. In addition, a convection-dispersion PDE is developed to calculate the distribution of asphaltene concentration and include the effect of dispersion of asphaltene particles in the model. A reduction in transmissibility and large additional pressure drop due to asphaltene precipitation are used to infer the extent of damage to porous medium. Furthermore, an artificial neural network is trained using asphaltene deposition data and is then applied to calculate permeability evolution based on porosity. Finally, the modeling results are validated by experimental data.Interpretation of the obtained results and tracking of distribution for various fractions of asphaltene are useful to detect and evaluate the asphaltene dependent phenomena, their real cause and relative importance, and the locations where they may occur.Asphaltene is shown to affect the oil production rate and recovery efficiency. An enhanced knowledge of all relevant mechanisms and considering them in simulation and decision making will lead to the development of improved production schemes.

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“…Experimental observations on permeability reduction induced by asphaltene deposition have been widely reported in the literature [5][6][7][8] . Kamath et al 8 and Clementz 9 described observations on wettability changes due to asphaltene deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Kamath et al 8 and Clementz 9 described observations on wettability changes due to asphaltene deposition. Kamath et al 8 also discussed the effect of asphaltene deposition on waterflood performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Asphaltene-Induced Formation Damage

Nabzar

Aguilera

Rajoub

2005

SPE International Symposium on Oilfield Chemistry

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractApplication of many EOR technologies provokes productivity decline due to asphaltene deposition leading to wellbore plugging and flow restriction in tubing, flow lines and production facilities. The present study aims at investigating the kinetics of asphaltene deposition using both model system and actual crude oil. Experiments were performed by injecting asphaltenic fluids into capillaries and outcrop sandstones. The effect of flow rate, presence of resins and asphaltene aggregation were investigated.It was experimentally evidenced that asphaltene deposition is a continuous process that results in multilayer deposition. It was demonstrated that asphaltene deposition takes place according to the well-known scaling law of Diffusion Limited Deposition (DLD) regime. The results demonstrated that multilayer deposition might be hindered by shear rate. It was shown that, above a first critical shear rate (lower critical shear rate) that depends on asphaltene aggregation state, the multilayer deposition kinetic is slowed down upon increasing injection flow rate. The flow rate dependence switches from -2/3 to -5/3 power law. This latter exponent is thought to encompass the classical -2/3 dependence of the DLD regime and the effect of asphaltene detachment that, therefore, varies as the flow rate to the power -1. The results put into evidence the existence of an upper critical shear rate value beyond which multilayer deposition is totally hindered. The value of this critical shear rate depends on resin content and varies exponentially with solvent quality.In conclusion, the experimental results showed that the "colloidal approach" is a valuable route for asphaltene deposition modeling that can be used to develop a more realistic asphaltene near-wellbore damage model that takes into account the actual physics of the process.L. Nabzar, M.E. Aguilera, and Y. Rajoub, Inst. Français du Pétrole

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Effect of Asphaltene Deposition on Dynamic Displacements of Oil by Water

Cited by 64 publications

References 15 publications

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

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

Development of a Numerical Scheme for Simulation of Asphaltene Dependent Phenomena in Porous Media

Experimental Study on Asphaltene-Induced Formation Damage

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