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| 1 | PPARα ligand clofibrate ameliorates blood pressure and vascular reactivity in spontaneously hypertensive rats显示文摘 | Zivar YOUSEFIPOUR Mohammad NEWAZ | 2014 | Acta Pharmacologica Sinica2014，35，4： | 2 |
| 2 | Insulin-like growth factor-1 and insulin-like gwwth factor binding proteins in cerebrospinal fluid during the development of mouse embryos显示文摘 | Zivar Salehi Farhad Mashayekhi Mohammad Naji | 2009 | Journal of Clinical Neuroscience2009，16，： | 1 |
| 3 | Prevalence of Linguatula serrata in lymph nodes of small ruminants: case from Iran显示文摘 | Zivar Sadeghi Dehkordi Mohammad Reza Pajohi-Alamoti Sakinee Azami A. R. Bahonar | 2014 | Comparative Clinical Pathology2014，，3： | 1 |
| 4 | Acrolein activates mitogen-activated protein kinase signal transduction pathways in rat vascular smooth muscle cells显示文摘 | Kasturi Ranganna Zivar Yousefipour Rami Nasif Frank M. Yatsu Shirlette G. Milton Barbara E. Hayes | 2002 | Molecular and Cellular Biochemistry (-)2002，，1： | 1 |
| 5 | Insights into wettability alteration during low-salinity water flooding by capacitance-resistance model显示文摘The capacitance-resistance model(CRM)has been widely implemented to model and optimise water-flooding and enhanced oil recovery(EOR)techniques.However,there is a gap in the application of CRM to analyse physical phenomena in porous media as well as the performance of EOR methods,such as low-salinity water(LSW)flooding.The main purposes of this study were to investigate how changes in time constant,as a CRM parameter,can represent physical phenomena in porous media such as wettability alteration.Moreover,to show CRM is a reliable tool to use for interpretation of LSW process as an EOR method.The results of different experimental/modelling studies in this research showed that in CRM model time constant increases when the wettability alters to a water wetness state,whereby the smallest time constant value is observed for the oil wet medium and the highest is observed for the water wet medium.The cases with a gradual alteration in wettability show an increasing trend with the dilution of the injection water.The core flooding data confirms the observed results of the simulation approach.The increment in time constant values indicates the resistance against displacing fluid,which is due to the wettability alteration of the porous medium,resulting in additional oil production.The observations made during this research illustrate that the time constant parameter can be a powerful tool for comparing different EOR techniques,since it is a good indication of the speed of impact of a particular injection fluid on production. | Davood Zivar Akzhol Ishanov Peyman Pourafshary | 2022 | Petroleum Research2022，7，4： | 0 |
| 6 | Evaluation of sample scale effect on geomechanical tests显示文摘The size of the rock specimen affects the stress concentrates in the vicinity of the top/bottom of the rock specimen during the evaluation of the geomechanical parameters in the laboratory,which causes un-reliable results.However,the appropriate size for geomechanical evaluation is not well understood yet because of limitations in the sampling and analysis.In this study,a series of numerical simulations using a finite element package was conducted to investigate the effect of sample aspect ratio,fluid saturation,and porosity,on the mechanical behavior of the rock under elastic and poroelastic conditions.In addition,two concepts,stress/strain homogeneity index(SHI)and representative elementary volume(REV),were developed to find out the appropriate sample size.The results show that the presence of stiff platens,which are dissimilar to the specimen material,causes significant stress concentration in the two ends of the specimen.The concentration of stress in the specimen reduces when the aspect ratio increases.An optimum aspect ratio(length-to-diameter equal to 3)was observed by SHI analysis which after that the changes in stress concentration are insignificant.The REV size analysis confirms the obtained optimum aspect ratio by SHI analysis.The saturated specimens show a lower magnitude of stress than applied stress because of the presence of pore pressure,which can carry a portion of the stress.The higher void ratio results in lower strength of the specimen.This study could be beneficial for the better design of geomechanical tests to have reliable results. | Maryam Kashfi Saeed Shad Davood Zivar | 2022 | Petroleum Research2022，7，4： | 0 |
| 7 | Mechanical behavior of salt rocks: A geomechanical model显示文摘The geomechanical behavior of salt rocks is a significant concern during drilling and development operations in some hydrocarbon reservoirs and underground gas storage sites.In this study,the static and dynamic salt rock geomechanical properties from a field in southwest Iran were evaluated using experiments such as waves'velocities,and thermo-mechanical coupled uniaxial and triaxial compression tests.As a result and by considering both the petrophysical well logs and laboratory data of the waves’velocities,it is observed that the elastic properties of the core samples are concentrated within a narrow range unless an abnormality causes scatter.The results of uniaxial compression tests showed that rock strength decreases with increasing temperature linearly.In addition,the reduction of rock strength was observed with increasing porosity of the core samples as expected.In the case of triaxial compression tests,applying confining pressure on the core sample caused an increment in rock strength,while temperature decreased rock strength.The temperature also increased cohesion and decreases friction angle.The ratio of changes in stress to strain was used to investigate the dynamic changes in the geomechanical state.The maximum 0.25 damage factor was observed for the core samples for different definitions of the damage factor.Finally,we propose a novel analytical model to predict the stress-strain behavior of salt rocks at different conditions.The model was validated using experimental results and indicated a satisfactory accuracy. | Saeed Shad Negar Razaghi Davood Zivar Soheil Mellat | 2023 | Petroleum2023，9，4： | 0 |
| 8 | Investigation of replacing tracer flooding analysis by capacitance resistance model to estimate interwell connectivity显示文摘Interwell connectivity is an essential parameter for managing waterflooding operations in a field.Analysis of the tracer injection operation is a well-known approach to studying injected fluids distribution in a reservoir and toward producer wells.Developed in the early 2000s,capacitance-resistance model(CRM)is an analytical approach for waterflooding modeling and optimization.Production/injection data are used as input to model the mass balance and estimate parameters such as the interwell connectivity.In this work,we investigated the accuracy of applying the capacitance-resistance model to mimic a tracer test.Such an approach helps assess the connection between the wells and decide on further field development steps cheaper and quicker.Connectivity values estimated by tracer tests and CRM were analyzed and compared for synthetic and real fields.CRM was capable of modeling waterflooding and estimating production in both fields with acceptable accuracy.Parameters such as well spacing and fluid loss during the injection were considered to improve the accuracy of the CRM approach to calculate the interwell connectivity between injector/producer pairs.Our study showed that CRM could serve as a tool for a quick approximate estimation of interwell connectivity under certain assumptions and is recommended as a replacement for tracer flooding analysis,where the tracer test is not possible or is expensive. | Adilet Aliyev Davood Zivar Peyman Pourafshary | 2023 | Petroleum2023，9，1： | 0 |
| 9 | Geomechanical analysis of an oil field:Numerical study of wellbore stability and reservoir subsidence显示文摘Geomechanics as the knowledge of rock deformation and stability is an indispensable part of all field development plans.Conducting geomechanical analyses leads to a safer and more efficient operation otherwise different kinds of instability and distortion might occur.In this study,the geomechanical behavior of Ilam and Sarvak formations of an oil field in southwest of Iran was investigated.The research objectives can be summarized as wellbore stability evaluation and predicting the value of reservoir subsidence due to pressure drop as a result of reservoir fluid production.To fulfill these,a set of petrophysical logs run in the exploration well of this green field were collected.Next,using empirical correlations and statistical methods,required data for evaluating wellbore stability during drilling,specifying safe mud window to discover reservoir breakdown pressure,predicting the possibility of wellbore collapse in field lifetime,and assessing reservoir subsidence were determined.The results revealed that the average subsidence value as the consequence of production within 21 years is 0.275 ft Which is not significant.In terms of wellbore stability,it was concluded that all horizontal and vertical wells remain stable during this time period.Briefly to conclude,field development is not associated with alarming incidents from geomechanical aspect. | Saeed Shad Parvin Kolahkaj Davood Zivar | 2023 | Petroleum Research2023，8，3： | 0 |
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