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Prediction of oil recovery in naturally fractured reservoirs subjected to reinfiltration during gravity drainage using a new scaling equation

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Petroleum Exploration and Development 2020年第6期47卷 1307-1315页

作者： AGHABARARI Amirhossein GHAEDI Mojtaba riazi Masoud Department of Petroleum Engineering School of Chemical and Petroleum EngineeringP.O.Box ***Shiraz UniversityShirazIran Reservoir Modeling and Simulation Center(RMSC) P.O.Box ***Shiraz UniversityShirazIran

By comparing numerical simulation results of single-porosity and dual-porosity models,the significant effect of reinfiltration to naturally fractured reservoirs was confirmed.A new governing equation was proposed for oil drainage in a matrix block under the reinfiltration *** inspectional analysis,a dimensionless equation suitable for scaling of recovery curves for matrix blocks under reinfiltration has been *** the design of experiments,test cases with different rock and fluid properties were defined to confirm the scope of the presented *** defined cases were simulated using a realistic numerical simulation *** method can estimate the oil amount getting into the matrix block through reinfiltration,help simulate the oil drainage process in naturally fractured reservoirs accurately,and predict the recovery rate of matrix block in the early to middle periods of *** the defined scaling equation in the dual-porosity model can improve the accuracy of the predicted recovery rate.

关键词： naturally fractured reservoir gravity drainage reinfiltration scaling equation dual-porosity simulation inspectional analysis

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Activating solution gas drive as an extra oil production mechanism after carbonated water injection

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2938-2945页

作者： Mahmood Shakiba Shahab Ayatollahi Masoud riazi Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteShiraz UniversityShirazIran Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran School of Chemical and Petroleum Engineering Sharif University of TechnologyTehranIran

Enhanced oil recovery(EOR)methods are mostly based on different phenomena taking place at the interfaces between fluid–fluid and rock–fluid *** the last decade,carbonated water injection(CWI)has been considered as one of the multi-objective EOR techniques to store CO2 in the hydrocarbon bearing formations as well as improving oil recovery *** CWI process,as the reservoir pressure declines,the dissolved CO2 in the oil phase evolves and gas nucleation phenomenon would *** a result,it can lead to oil saturation restoration and subsequently,oil displacement due to the hysteresis *** this condition,CO2 would act as insitu dissolved gas into the oil phase,and play the role of an artificial solution gas drive(SGD).In this study,the effect of SGD as an extra oil recovery mechanism after secondary and tertiary CWI(SCWI-TCWI)modes has been experimentally investigated in carbonate rocks using coreflood *** depressurization tests resulted in more than 25%and 18%of original oil in place(OOIP)because of the SGD after SCWI and TCWI tests,*** the ultimate enhanced oil recovery point of view,the efficiency of SGD was observed to be more than one-third of that of CWI ***,the pressure drop data revealed that the system pressure depends more on the oil production pattern than water production.

关键词： Solution gas drive Gas nucleation Carbonated water Enhanced oil recovery CO2 capture

Dearomatization of normal paraffin by adsorption process using synthesized NaX zeolite

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Petroleum Science 2013年第3期10卷 408-414页

作者： Hossein Faghihian Leila riazi Department of Chemistry Shahreza Branch Islamic Azad University86145-311 Iran R&D Department I. C. I. I. C.Isfahan Iran

Linear alkyl benzenes （LABs） are the main materials for detergent production. The presence of aromatic compounds in this material can decrease the quality of the final product and enhance the deactivation rate of catalysts. In this research we used zeolite NaX for de-aromatization of the recycled paraffin from the alkylation unit of an LAB production complex. The effect of different parameters on the removal efficiency of adsorbent was studied and optimized. To study the re-usability of the adsorbent, the breakthrough curves were obtained by using a fixed bed column filled with the adsorbent. The results indicated that the adsorbent capacity remained unchanged after three regeneration cycles. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. It was concluded that the Langmuir model agreed well with the experimental data. The calculated thermodynamic parameters of the adsorption showed that the adsorption process was spontaneous and exothermic. The reaction rate was estimated by the pseudo-second order kinetic model.

关键词： Dearomatization LAB zeolite adsorption separation

ENTROPY FUNCTIONAL FOR CONTINUOUS SYSTEMS OF FINITE ENTROPY

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Acta Mathematica Scientia 2012年第2期32卷 775-782页

作者： M.Rahimi A.riazi Department of Mathematics Amirkabir University of TechnologyTehranIran

In this article, we introduce the concept of entropy functional for continuous systems on compact metric spaces, and prove some of its properties. We also extract the Kolmogorov entropy from the entropy functional.

关键词： Entropy entropy functional invaxiant

Viscous fingering and its effect on areal sweep efficiency during waterflooding: an experimental study

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Petroleum Science 2019年第1期16卷 105-116页

作者： Zahra Kargozarfard Masoud riazi Shahab Ayatollahi Enhanced Oil Recovery (EOR) Research Centre IOR-EOR Research Institute Shiraz University Department of Petroleum Engineering School of Chemical and Petroleum Engineering Shiraz University Enhanced Oil Recovery (EOR) Research Center School of Chemical and Petroleum Engineering Sharif University of Technology

Viscous fingering is one of the main challenges that could reduce areal sweep efficiency during waterflooding in oil reservoirs. A series of waterflooding experiments were carried out in a Hele-Shaw cell at ambient temperature during which areal sweep efficiency was estimated and techniques to ease the fingering problem were examined. The onset and propagation of viscous fingers were monitored as a function of both injection rate and injection/production positions. Image processing techniques were utilized to quantitatively investigate the propagation of fingers. The experimental results show that, under specific conditions, increasing the number of finger branches could improve the areal sweep efficiency, whereas growth of a single narrow finger has a negative impact on oil displacement efficiency. According to the obtained results,increasing the injection rate improves the areal sweep efficiency up to a critical rate at which viscous fingers start to *** impact of heterogeneity of the medium on distributing the viscous fingers was also investigated by introducing two different arrangements of fractures in the model. The results show that fractures perpendicular to the direction of flow would distribute the displacing water more uniformly, while fractures in the direction of flow would amplify the unfavorable sweep efficiency.

关键词： Viscous fingering Areal sweep efficiency Front instability Mobility ratio Fractures Hele-Shaw cell

Impact of pertinent parameters on foam behavior in the entrance region of porous media:mathematical modeling

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Petroleum Science 2020年第6期17卷 1669-1682页

作者： Fereshteh Samimi Zahra Sakhaei Masoud riazi Department of Chemical Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteShiraz UniversityShirazIran Petroleum Engineering Department School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran

Foam injection is a promising solution for control of mobility in oil and gas field exploration and development,including enhanced oil recovery,matrix-acidization treatments,contaminated-aquifer remediation and gas leakage *** study presents a numerical investigation of foam behavior in a porous *** flow method is applied to describe steady-state foam displacement in the entrance *** this model,foam flow for the cases of excluding and including capillary pressure and for two types of gas,nitrogen(N2)and carbon dioxide(CO2)are *** of pertinent parameters are also *** indicate that the foam texture strongly governs foam flow in porous *** entrance region may be quite different for foam texture to accede local equilibrium,depending on the case and physical properties that are *** to the fact that the aim of foaming of injected gas is to reduce gas mobility,results show that CO2 is a more proper injecting gas than *** are also some ideas presented here on improvement in foam displacement *** study will provide an insight into future laboratory research and development of full-field foam flow in a porous medium.

关键词： Foam displacement Entrance region Fractional flow method Foam texture Water saturation Mathematical modeling

Pulse chirping effect on controlling the transverse cavity oscillations in nonlinear bubble regime

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Chinese Physics B 2017年第2期26卷 313-319页

作者： H Vosoughian Z riazi H Afarideh G Sarri Laser and Optic Institute Nuclear Science and Technology Research Institute Tehran Iran physics and Accelerator School Nuclear Science and Technology Research Institute Tehran Iran Department of Energy Engineering and Physics Amirkabir University of Technology P. O. Box 15875-4413 Tehran Iran School of Mathematics and Physics The Queen's University of Belfast BT7 INN Belfast United Kingdom

The propagation of an intense laser pulse in an under-dense plasma induces a plasma wake that is suitable for the acceleration of electrons to relativistic energies. For an ultra-intense laser pulse which has a longitudinal size shorter than the plasma wavelength, λp, instead of a periodic plasma wave, a cavity free from cold plasma electrons, called a bubble, is formed behind the laser pulse. An intense charge separation electric field inside the moving bubble can capture the electrons at the base of the bubble and accelerate them with a narrow energy spread. In the nonlinear bubble regime, due to localized depletion at the front of the pulse during its propagation through the plasma, the phase shift between carrier waves and pulse envelope plays an important role in plasma response. The carrier–envelope phase（CEP） breaks down the symmetric transverse ponderomotive force of the laser pulse that makes the bubble structure unstable. Our studies using a series of two-dimensional（2D） particle-in-cell（PIC） simulations show that the frequency-chirped laser pulses are more effective in controlling the pulse depletion rate and consequently the effect of the CEP in the bubble regime. The results indicate that the utilization of a positively chirped laser pulse leads to an increase in rate of erosion of the leading edge of the pulse that rapidly results in the formation of a steep intensity gradient at the front of the pulse. A more unstable bubble structure, the self-injections in different positions, and high dark current are the results of using a positively chirped laser pulse. For a negatively chirped laser pulse, the pulse depletion process is compensated during the propagation of the pulse in plasma in such a way that results in a more stable bubble shape and therefore, a localized electron bunch is produced during the acceleration process. As a result, by the proper choice of chirping, one can tune the number of self-injected electrons, the size of accelerated bunch

关键词： bubble regime plasma wake field positively chirped laser pulse

Review on application of nanoparticles for EOR purposes: A critical review of the opportunities and challenges

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Chinese Journal of Chemical Engineering 2019年第2期27卷 237-246页

作者： Yousef Kazemzadeh Sanaz Shojaei Masoud riazi Mohammad Sharifi Department of Petroleum Engineering Amirkabir University of Technology Tehran Polytechnic Enhanced Oil Recovery (EOR) Research Centre IOR/EOR Research Institute Shiraz University Petroleum Engineering Department School of Chemical and Petroleum Eng. Shiraz University

Nanoparticles have already gained attentions for their countless potential applications in enhanced oil ***-sized particles would help to recover trapped oil by several mechanisms including interfacial tension reduction, impulsive emulsion formation and wettability alteration of porous media. The presence of dispersed nanoparticles in injected fluids would enhance the recovery process through their movement towards oil–water interface. This would cause the interfacial tension to be reduced. In this research, the effects of different types of nanoparticles and different nanoparticle concentrations on EOR processes were investigated. Different flooding experiments were investigated to reveal enhancing oil recovery mechanisms. The results showed that nanoparticles have the ability to reduce the IFT as well as contact angle, making the solid surface to more water wet. As nanoparticle concentration increases more trapped oil was produced mainly due to wettability alteration to water wet and IFT reduction. However, pore blockage was also observed due to adsorption of nanoparticles, a phenomenon which caused the injection pressure to increase. Nonetheless, such higher injection pressure could displace some trapped oil in the small pore channels out of the model. The investigated results gave a clear indication that the EOR potential of nanoparticle fluid is significant.

关键词： Enhance oil recovery Nanofluid injection Nanoparticle Interfacial tension Wettability alteration Pore blockage

Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines

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Petroleum Science 2019年第6期16卷 1361-1373页

作者： Ehsan Ghandi Rafat Parsaei Masoud riazi Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteSchool of Chemical and Petroleum EngineeringShiraz UniversityShirazIran Department of Petroleum Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran

Most fractured carbonate oil reservoirs have oil-wet ***,the process of imbibing water from the fractures into the matrix is usually poor or basically does not exist due to negative capillary *** achieve appropriate ultimate oil recovery in these reservoirs,a water-based enhanced oil recovery method must be capable of altering the wettability of matrix *** studies showed that carbonated water can alter wettability of carbonate oil-wet rocks toward less oil-wet or neutral wettability conditions,but the degree of modification is not high enough to allow water to imbibe spontaneously into the matrix blocks at an effective *** this study,we manipulated carbonated brine chemistry to enhance its wettability alteration features and hence to improve water imbibition rate and ultimate oil recovery upon spontaneous imbibition in dolomite ***,the contact angle and interfacial tension(IFT)of brine/crude oil systems were measured for several synthetic brine samples with different ***,two solutions with a significant difference in WAI(wettability alteration index)but approximately equal brine/oil IFT were chosen for spontaneous imbibition *** the next step,spontaneous imbibition experiments at ambient and high pressures were conducted to evaluate the ability of carbonated smart water in enhancing the spontaneous imbibition rate and ultimate oil recovery in dolomite *** results showed that an appropriate adjustment of the imbibition brine(i.e.,carbonated smart water)chemistry improves imbibition rate of carbonated water in oil-wet dolomite rocks as well as the ultimate oil recovery.

关键词： Spontaneous imbibition Carbonated smart water Wettability alteration Enhanced oil recovery Dolomite rocks