Design of Thermoresponsive Polymers to Selective Permeability Reduction in Porous Media

2020 ◽  
Author(s):  
Giuseppe Maddinelli ◽  
Martin Bartosek ◽  
Stefano Carminati ◽  
Leili Moghadasi ◽  
Nicolò Manfredini ◽  
...  
Keyword(s):  
Porous Media ◽  
Permeability Reduction ◽  
Thermoresponsive Polymers ◽  
Selective Permeability

Investigation of Effective Mechanisms in Permeability Reduction Due to Asphaltene Deposition through Porous Media

2013 ◽  
Author(s):  
M. Khederzadeh ◽  
S. Ostadrezaei ◽  
Iran R. Kharrat ◽  
H. Bagherzadeh ◽  
S. Mahdavi ◽  
...  
Keyword(s):  
Porous Media ◽  
Permeability Reduction ◽  
Asphaltene Deposition

An Integrated Simulation Approach to Predict Permeability Impairment under Simultaneous Aggregation and Deposition of Asphaltene Particles

SPE Journal ◽  
2021 ◽  
pp. 1-14
Author(s):  
Xin Su ◽  
Rouzbeh G. Moghanloo ◽  
Minhui Qi ◽  
Xiang-an Yue
Keyword(s):  
Porous Media ◽  
Particle Aggregation ◽  
Formation Damage ◽  
Permeability Reduction ◽  
Simulation Approach ◽  
Pore Connectivity ◽  
Integrated Simulation ◽  
Asphaltene Deposition ◽  
Simulation Results ◽  
Permeability Impairment

Summary Formation damage mechanisms in general lower the quality of the near wellbore, often manifested in the form of permeability reduction, and thus reducing the productivity of production wells and injectivity of injection wells. Asphaltene deposition, as one of the important causes, can trigger serious formation damage issues and significantly restrict the production capacity of oil wells. Several mechanisms acting simultaneously contribute to the complexity associated with prediction of permeability impairment owing to asphaltene deposition; thus, integration of modeling efforts for asphaltene aggregation and deposition mechanisms seems inevitable for improved predictability. In this work, an integrated simulation approach is proposed to predict permeability impairment in porous medium. The proposed approach is novel because it integrates various mathematical models to study permeability impairment considering porosity reduction, particle aggregation, and pore connectivity loss caused by asphaltene deposition. To improve the accuracy of simulation results, porous media is considered as a bundle (different size) of capillary tubes with dynamic interconnectivity. The total volume change of interconnected tubes will directly represent permeability reduction realized in porous media. The prediction of asphaltene deposition in porous media is improved in this paper via integration of the particle aggregation model into calculation. The simulation results were verified by comparing with existing experimental data sets. After that, a sensitivity analysis was performed to study parameters that affect permeability impairment. The simulation results show that our permeability impairment model—considering asphaltene deposition, aggregation, and pore connectivity loss—can accurately reproduce the experimental results with fewer fitting or empirical parameters needed. The sensitivity analysis shows that longer aggregation time, higher flow velocity, and bigger precipitation concentration will lead to a faster permeability reduction. The findings of this study can help provide better understanding of the permeability impairment caused by asphaltene deposition and pore blockage, which provides useful insights for prediction of production performance of oil wells.

A network model for capture of emulsion droplets in porous media

2008 ◽  
Vol 48 (1) ◽  
pp. 21
Author(s):  
Changhong Gao
Keyword(s):  
Porous Media ◽  
Enhanced Oil Recovery ◽  
Network Model ◽  
Oil Recovery ◽  
Produced Water ◽  
Permeability Reduction ◽  
Oil Droplets ◽  
New Approach ◽  
Reservoir Rocks ◽  
Emulsion Droplets

Capture of emulsion droplets in porous media can be costly or beneficial. When produced water is injected into reservoir for pressure maintenance, the oil droplets in produced water can plug reservoir rocks and cause the well to lose injectivity. Enhanced oil recovery (EOR) technology takes advantage of this feature and plugs high-injectivity zones with emulsions. Previous studies reveal that interception and straining are the mechanisms of permeability decline. Established models rely on filtration data to determine key parameters. In this work, a network model is proposed to simulate capture of oil droplets in reservoir rocks and resultant permeability reduction. The model is validated with test data and reasonably good results are obtained. The simulation also reveals that the wettability of the tested porous media was altered by injection of emulsions. The new approach considers the characteristics of the porous media and incorporates the damage mechanisms, thus providing more scientific insights into the flow and capture of droplets in porous media.

Permeability reduction by asphaltenes and resins deposition in porous media

Fuel ◽  
2008 ◽  
Vol 87 (10-11) ◽  
pp. 2178-2185 ◽  
Author(s):  
R. Hamadou ◽  
M. Khodja ◽  
M. Kartout ◽  
A. Jada
Keyword(s):  
Porous Media ◽  
Permeability Reduction

scholarly journals Identification of Nanocellulose Retention Characteristics in Porous Media

2018 ◽  
Author(s):  
Reidun C. Aadland ◽  
Carter J. Dziuba ◽  
Ellinor B. Heggset ◽  
Kristin Syverud ◽  
Ole Torsæter ◽  
...  
Keyword(s):  
Grain Size ◽  
Porous Media ◽  
Oil Recovery ◽  
Petroleum Industry ◽  
Retention Mechanism ◽  
Bulk Solution ◽  
Permeability Reduction ◽  
Berea Sandstone ◽  
Retention Characteristics ◽  
Series Of Experiments

The application of nanotechnology to the petroleum industry has sparked recent interest to increase oil recovery while reducing environmental impact. Nanocellulose is an emerging nanoparticle that is derived from trees and may provide an environmentally friendly alternative to current enhanced oil recovery (EOR) technologies. However, before nanocellulose can be applied as an EOR technique, further understanding of its transport behavior and retention in porous media is required. The research documented in this paper examines retention mechanisms that occur during nanocellulose transport. In a series of experiments, nanocellulose particles dispersed in brine were injected into sandpacks and Berea sandstone cores. The resulting retention and permeability reduction were measured. The experimental parameters that were varied include sand grain size, nanocellulose type, salinity, and flow rate. Under low salinity conditions, the dominant retention mechanism was adsorption and when salinity was increased, the dominant retention mechanism shifted towards log-jamming. Retention and permeability reduction increased as grain size decreased, which results from increased straining of nanocellulose aggregates. In addition, each type of nanocellulose was found to have significantly different transport properties. The experiments with Berea sandstone cores indicate that some pore volume was inaccessible to the nanocellulose. As a general trend, the larger the size of aggregates in bulk solution, the greater the observed retention and permeability reduction. Salinity was found to be the most important parameter affecting transport. Increased salinity caused additional aggregation, which led to increased straining and filter cake formation. Higher flow rates were found to reduce retention and permeability reduction. Increased velocity was accompanied by an increase in shear which is believed to promote breakdown of nanocellulose aggregates.

Surfactant Flooding 2 *: The Effect of Alkaline Additives on Permeability and Sweep Efficiency

1982 ◽  
Vol 22 (06) ◽  
pp. 983-992 ◽  
Author(s):  
Paul H. Krumrine ◽  
James S. Falcone ◽  
Thomas C. Campbell
Keyword(s):  
Metal Ions ◽  
Sodium Silicate ◽  
Oil Recovery ◽  
Permeability Reduction ◽  
Residual Oil ◽  
Sweep Efficiency ◽  
Selective Permeability ◽  
Hardness Removal ◽  
Multivalent Metal ◽  
Sodium Orthosilicate

Abstract This paper is the second of a series of papers reporting our examinations of the effects alkaline additives have on dilute surfactant systems for low-tension waterflooding (LTWF). The first paper outlined the effects on interfacial tension (IFT), hardness removal, and surfactant retention by the core material. and how these parameters then affect overall recovery of oil from watered-out cores containing, high-hardness brines. This study examines the effects of those chemicals on permeability, sweep efficiency. and sweep symmetry through multipermeable noncommunicating zones. Correlations and possible mechanisms are offered that relate these findings to the earlier work on surfactant retention and hardness removal. The results of these studies indicate that each alkali behaves differently, but all are capable of enhancing the action of the dilute surfactant treatment. Sweep efficiency in three-dimensional (3D) patterns and sweep symmetry through multipermeable noncommunicating zones is increased by the alkaline chemicals. Selective permeability reduction, caused by the reaction with the residual hardness ions. is suspected as a mechanism. Overall, sodium silicate addition to the surfactant flood as a builder was found to produce the best performance because of its ability to inhibit surfactant retention, thereby increasing the recovery of crude before selective permeability reduction occurs. Overall permeability loss is only about 20 to 25% in a core initially containing 4.800 ppm of hardness as CaCO under our experimental conditions. Introduction The effect of surfactants in enhanced oil-recovery (EOR) systems is of great interest to those concerned with designing cost-effective processes to recover residual oil after waterflooding. Earlier work in this area shows surfactants playing, a role in three types of processes: alkaline flooding, where an alkali is added to a reservoir to form in-situ petroleum surfactants; LTWF, where a dilute surfactant solution containing a sacrificial inorganic agent is injected to form a tertiary-oil bank, and finally micellar/polymer flooding, where a surfactant/crude-oil slug, miscible with reservoir crude, is injected into a formation. In each case, a primary consideration is optimization of the effectiveness of the surfactant. Surfactant performance is impaired by any or all of these phenomena: complexation with multivalent metal ions in the reservoir or injection water, association with other surfactant- molecules and/or "sorption" into the reservoir substrate. This latter effect can be enhanced by the sorption of reservoir metal ions onto the substrate surface. providing added active sites for anionic surfactant interaction. It is obvious that surfactant and metal ions play an antagonistic role in contributing to the effectiveness of the oil-recovery process, and, therefore, considerable efforts are expended in development of reservoir conditioning stages (preflushes) before injection of a more expensive surfactant-containing or -generating slug. Detergency technology teaches that certain inorganic chemicals, most predominantly sodium silicate, sodium phosphate, and sodium carbonate (usually called builders) can improve surfactant's performance by minimizing the harmful effects of multivalent metal ions. Holm and Robertson have shown that sodium orthosilicate, when used as a preflush in their micellar/polymer system, improves residual oil recovery significantly over that by NaCl. Feuerbacher and Smith developed the use of these builders, preferably NaOH or sodium metasilicate, as preflush agents before LTWF. The use of the more alkaline builders-e.g., sodium orthosilicate in alkaline flooding -has been known since Nutting's) work in 1925. SPEJ P. 983^

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