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Petroleum 2016年第2期2卷 156-165页

作者： Arash Azamifard Mahnaz Hekmatzadeh Bahram Dabir Amirkabir University of Technology Tehran Polytechnic424 Hafez AveTehranIran ior Research Inistitute National Iranian Oil CompanyTehranIran

Gas condensate is one of the most different fluids in reservoir simulation due to retrograde condensation in case of pressure *** this kind of fluids,two phenomena named negative inertia and positive coupling,become significant in the high velocity zone around the *** this study,a modified black oil simulator is developed that take into account the velocity dependent relative *** the industrial simulator that assumes linear variation of transmissibilities by pressure,modified black oil nonlinear equations are solved directly without *** developed code is validated by ECLIPSE *** behavior of two real gas condensate fluids,a lean and a rich one,are compared with each *** each fluid,simulations of PVT experiments are carried out to calculate black oil property applying Coats approach for gas condensate *** both fluids,the proposed models for gas condensate velocity dependent relative permeability show different influence of velocity on relative permeability in the same ***,it is observed that higher flow rate of gas production leads to more condensate production during constant rate well testing.

关键词： Gas condensate Velocity dependent relative permeability Modified black oil simulation Numerical well testing

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

Influence of temperature cycling and pore fluid on tensile strength of chalk

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第2期11卷 277-288页

作者： T.Voake A.Nermoen C.Ravn?s R.I.Korsnes I.L.Fabricius University of Stavanger The National ior Center of Norway University of Stavanger NORCE Norwegian Research Centre AS Technical University of Denmark

Calcite has a highly anisotropic thermal expansion coefficient, and repeated heating and cooling cycles can potentially destabilize chalks by breaking cement bonds between neighboring particles. Based on tensile strength measurements, we investigated how temperature cycles induce weakening of *** strength tests were performed on chalk specimens sampled from Kansas(USA) and Mons(Belgium), each with differing amounts of contact cement. Samples of the two chalk types were tested in dry and water-saturated states, and then exposed to 0, 15, and 30 temperature cycles in order to find out under what circumstances thermally induced tensile strength reduction occurs. The testing results show that the dry samples were not influenced by temperature cycling in either of the chalk types. However, in the water-saturated state, tensile strength is increasingly reduced with progressive numbers of temperature cycles for both chalk samples, especially for the more cemented Kansas chalk. The Kansas chalk demonstrated higher initial tensile strength compared to the less cemented Mons chalk, but the strength of both chalks was reduced by the same relative proportion when undergoing thermal cycles in the water-saturated state.

关键词： Tensile strength Weakening by heating and cooling cycles Anisotropic thermal expansion

Phase and Microstructure Analysis of Cu-Cr-Zr Alloys

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Journal of Materials Science & Technology 2007年第6期23卷 795-800页

作者： Huaqing LI Shuisheng XIE Xujun MI Pengyue WU Suzhou Institute ior Nonierrous Metal Research Suzhou 215026 China State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Beijing 100088 China

Phases of Cu-（0.4%-2.0%） Cr-（0.05%-0.16%） Zr alloys were analyzed in both as cast and deformed state. Solute-rich clusters of Cr, which was supposed to form during aging treatment, were observed in as cast state; along with the morphology character, corresponding preferential orientation of Cr phase in as cast state was also investigated. Precipitates were observed to distribute in the matrix with a bimodal distribution, viz. coarse precipitates with dimension larger than several hundred nanometers and fine precipitates with size of 2- 10 nm. Three types of intermetallics, the common compound of Cu51Zr14, correspondingly infrequent Cu5Zr and rare Cu5Zr3, were characterized in different samples.

关键词： Cu-Cr-Zr alloy Solute-rich cluster Intermetallic compound Microstructure

Impacts of interactions with low-mineralized water on permeability and pore behavior of carbonate reservoirs

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Energy Geoscience

Energy Geoscience 2024年第4期5卷 278-290页

作者： Dmitriy A.Martyushev Inna N.Ponomareva Vasiliy I.Chernykh Shadfar Davoodi Yousef Kazemzadeh Tianshou Ma Department of Oil and Gas Technologies Perm National Research Polytechnic UniversityPermRussia School of Earth Sciences&Engineering Tomsk Polytechnic UniversityLenin AvenueTomskRussia Enhanced Oil Recovery(EOR)Research Center IOR/EOR Research InstituteShiraz UniversityShirazIran State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuanPR China

Laboratory filtration experiments are employed to investigate effective well killing while minimizing its impacts on surrounding *** novelty of this experimental study lies in the prolonged exposure of rock samples to the killing fluid for seven days,corresponding to the average duration of well workovers in the oilfields in Perm Krai,*** findings indicate that critical factors influencing the interactions between rocks and the killing fluid include the chemical composition of the killing fluid,the mineralogical composition of the carbonate rocks,reservoir pressure and temperature,and the contact *** analyses using multi-scale X-ray computed tomography,field emission scanning electron microscopy,and X-ray diffraction were conducted on samples both before and after the well killing *** experiments were performed using real samples of cores,crude oil,and the killing *** results from this study indicate that low-mineralized water(practically fresh water)is a carbonate rock *** water causes the dissolution of rock components,the formation of new calcite crystals and amoeba-like secretions,and the migration of small particles(clay,quartz,and carbonates).The formation of deep channels was also *** assessment reveals that the change in the pH of the killing fluid indicates that the observed mineral reactions were caused by carbonate *** combined phenomena led to a decrease in the total number of voids in the core samples,which was 25%on average,predominantly among voids measuring between 45 and 70μm in *** change in the pore distribution in the bulk of the samples resulted in decreases in porosity of 1.8%and permeability of 67.0%in the studied core *** results from this study indicate the unsuitability of low-mineralized water as a well killing fluid in carbonate *** composition of the killing fluid should be optimized,for example,in terms of the ionic composition of water,

关键词： Fine particle Clay mineral Low-mineralized water Geochemical dissolution Carbonate reservoir

Review on chemical enhanced oil recovery using polymer flooding: Fundamentals, experimental and numerical simulation

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Petroleum 2020年第2期6卷 115-122页

作者： Ali Mohsenatabar Firozjaii Hamid Reza Saghafi Department of Petroleum Engineering Petroleum University of TechnologyAbadanIran ior/EOR Research Institute National Iranian Oil CompanyTehranIran

The EOR techniques are employed to recover more oil from mature reservoirs after the primary and secondary oil production *** flooding as a chemical EOR method involves adding polymer molecules in order to increase water *** water viscosity will improve the mobility ratio of injected fluid to reservoir fluid toward a more favorable ***,vertical and areal sweep efficiencies are increased compared to typical water *** flooding will be most effective if applied in the early stages of a water flood while the mobile oil saturation is still *** is also a critical component when considering other chemical EOR technologies such as alkaline-polymer or *** present study covers two main *** the first part,fundamental of polymer flooding as it related to experimental work and simulation are *** challenge of polymer flooding applications in high temperature and high salinity(HTHS)environment is also discussed in this *** the second part,the synergy of polymer with surfactant and alkaline as chemical enhancing oil recovery(CEOR)methods is discussed.

关键词： Polymer flooding Enhancing oil recovery Mobility control HPAM TVP

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

Temperature cycling and its effect on mechanical behaviours of highporosity chalks

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 749-759页

作者： T.Voake A.Nermoen R.I.Korsnes I.L.Fabricius University of Stavanger StavangerNorway The National ior Centre of Norway University of StavangerStavangerNorway International Research Institute of Stavanger (IRIS) StavangerNorway Technical University of Denmark (DTU) CopenhagenDenmark

Temperature history can have a significant effect on the strength of water-saturated *** this study,hydrostatic stress cycles are applied to understand the mechanical response of chalk samples exposed to temperature cycling between each stress cycle,compared to the samples tested at a constant *** total accumulated strain during a stress cycle and the irreversible strain are *** samples from Kansas (USA) and Mons (Belgium),with different degrees of induration (*** of contact cementation),were *** samples were saturated with equilibrated water (polar) and nonpolar Isopar H oil to quantify water *** samples tested during 10 stress cycles with varying temperature (*** cycled in between each stress cycle) accumulated more strain than those tested at constant *** the stress cycles were performed at 30 ℃.The two chalk types behaved similarly when saturated with Isopar H oil,but differently when saturated with *** saturated with water,the stronger Kansas chalk accumulated more total strain and more irreversible strain within each stress cycle than the weaker Mons chalk.

关键词： Elastoplastic partitioning Anisotropic thermal expansion Strain accumulation due to temperature and stress cycles

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

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