Evaluation of the Effect of the Asphaltene Accumulation in Porous Media at Dynamic Conditions for a Colombian Crude Oil

Moreno, Luis Felipe Carrillo; León, Emiliano Ariza; Garcia, Robert Padron; Nino, Juan Carlos Lizcano

doi:10.2118/171135-ms

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Several authors agree that the predominant variables that determine the precipitation of asphaltenes are pressure and composition, but temperature can also have an influence on the trend of the asphaltene precipitation of an oil [52][53][54].…”

Section: Asphaltene Precipitationmentioning

confidence: 99%

“…A clear example of the effect of composition on asphaltene precipitation can be observed in processes that require the injection of some type of fluid into the reservoir, such as advanced recovery or well stimulation, where considerable amounts of substances are injected that can destabilize asphaltenes in petroleum. This occurs because such substances generate a change in the oil solubility parameter, and therefore, the precipitation of asphaltenes can occur when the oil is mixed with incompatible substances, with the operations of injection of CO 2 , gases, or solvents being critical [54][55][56][57][58].…”

Section: Asphaltene Precipitationmentioning

confidence: 99%

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Asphaltene Precipitation/Deposition Estimation and Inhibition through Nanotechnology: A Comprehensive Review

et al. 2023

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Asphaltene precipitation/deposition is considered a problem of formation damage, which can reduce the oil recovery factor. In addition, asphaltenes can be deposited in pipelines and surface installations, causing serious complications in guaranteeing runoff, decreasing the production of oil wells. The precipitation of asphaltenes can be minimized by reducing the oil production flowrate or by using chemical inhibitors. Analyzing the stability and precipitation trend of asphaltenes in petroleum is vital for the guarantee of flow. For this purpose, several experimental and numerical methods have been proposed. Once the risk of precipitation is established, strategies can be formulated for the prevention and diagnosis of deposition problems in production or production training. The tests can be performed with dead oil, available in the wellhead, and help in understanding the behavior of the asphaltenes. This review aims to present (i) the problem related to the precipitation of asphaltenes; (ii) thermodynamic models of asphaltene precipitation; and (iii) asphaltene inhibition, control, and removal techniques using nanoparticles.

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Section: Asphaltene Precipitationmentioning

confidence: 99%

Section: Asphaltene Precipitationmentioning

confidence: 99%

Asphaltene Precipitation/Deposition Estimation and Inhibition through Nanotechnology: A Comprehensive Review

et al. 2023

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Less-Concentrated HPAM Solutions as a Polymer Retention Reduction Method in CEOR

Lizcano¹,

Ferreira²,

Moreno³

2020

Rev. fuentes reventón enrg.

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Polymer Flooding has become one of the most implemented EOR techniques, due to three factors: First, Polymer flooding has expanded the range of the screening criteria parameters. Second, this EOR method is more effective than water injection, while handling water management issues in high water-cut reservoirs. Nevertheless, polymer retention can turn a viable technical project into an uneconomical one. Polymer loss due to retention is an inevitable phenomenon, which happens during injection processes. The development of experimental analysis aiming to minimize or reduce polymer loss from the displacing fluid bank is beneficial to broaden the application of this CEOR method. This experimental work evaluated the injection schemes aiming to reduce polymer retention in porous media. The approach consisted of injecting less-concentrated polymer banks followed for the main polymer bank designed for mobility control. An experimental methodology to quantify polymer retention due to each injected polymer bank, cumulative polymer retention, resistance factor, residual resistance factor and inaccessible pore volume (IPV) was developed. The measurement process was based on the injection of 20 PV polymer banks at a constant flow rate of 1ml/min at 25°C, separated by 30 PV brine banks. Two HPAM with molecular weights of 6-8 million and 20 million Daltons using 350mD and 5000 mD sandstone cores were tested, respectively. The HPAM solutions considering a Colombian field (0.7% NaCl) and seawater (3.5% TDS) salinities were prepared. All rock samples were previously submitted to the injection of 50 PV for preventing fines migration. Two injection schemes with variable polymer concentrations were performed: The first one in which the polymer concentration increased in each successive bank, and the second one in which the concentration decreased. HPAM concentration solutions from 50 ppm to 2000 ppm were sequentially used in both injection schemes. By comparing the results of these two schemes, the effect of the injection of the less-concentrated polymer solutions was evaluated. For the increasing concentration experiments, cumulative retention values of 175.7 μg/g and 58.9 μg/g were calculated for the low-molecular weight polymer and the high-molecular weight polymer, respectively. While comparing with decreasing concentration experiments, for the high-molecular weight HPAM a 19% of retention reduction was evidenced, but no retention reduction was observed for the low-molecular weight one. The results indicate that different retention mechanisms are strongly dependents on the absolute permeability of the samples. Additionally, IPV values of 0.5 PV and 0.25 PV were calculated using low and high permeability samples, respectively. There was no linear relation between the absolute permeability reduction and the polymer concentration of the first bank injected into the sample. The novelty of this work is to use sacrificial banks of less-concentrated HPAM solutions as a reducing retention agent for the polymer bank designed for mobility control.

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Evaluation of the Effect of the Asphaltene Accumulation in Porous Media at Dynamic Conditions for a Colombian Crude Oil

Cited by 2 publications

References 4 publications

Asphaltene Precipitation/Deposition Estimation and Inhibition through Nanotechnology: A Comprehensive Review

Asphaltene Precipitation/Deposition Estimation and Inhibition through Nanotechnology: A Comprehensive Review

Less-Concentrated HPAM Solutions as a Polymer Retention Reduction Method in CEOR

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