|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Investigation of rock salt layer creep and its effects on casing collapse显示文摘Casing collapse is one of the costly incidents in the oil industry. In the oil fields of southwest Iran, most casing collapses have occurred in Gachsaran formation, and the halite rock salt layer in this formation may be the main cause for these incidents because of its peculiar creep behavior. In this research, triaxial creep experiments have been conducted on Gachsaran salt samples under various temperatures and differential stresses. The main purpose was to determine the creep characteristics of Gachsaran rock salt,and to examine the role of creep in several casing collapses that occurred in this formation. Results indicated that the halite rock salt of Gachsaran formation basically obeys the power law;however, its creep parameters are quite different from other halite rocks elsewhere. The time-dependent creep of Gachsaran rock salt exhibits strong sensitivity to temperature change;however, its sensitivity to variation of differential stress is rather low. The numerical simulation of the rock salt creep in a real oil well demonstrated the importance of creep and reservoir conditions on the safety factor of the tubing related to casing collapse. | S.Reza Taheri Ali Pak Saeed Shad Behzad Mehrgini Meisam Razifar | 2020 | International Journal of Mining Science and Technology2020，30，3： | 6 |
| 2 | Effect of different host plants on the fitness of diamond-back moth, PluteUa xylostella (Lepidoptem: Plutellidae)显示文摘 | SAEED R SAYYED A H SHAD S A | 2010 | Crop Protection2010，，29： | 1 |
| 3 | Some new prospects in the understanding of the molecular basis of the pathogenesis of stroke 显示文摘 | Saeed SA Shad KF Saleem T | 2007 | Experimental Brain Research2007，182，1： | 1 |
| 4 | Some new prospects in theunderstanding of the molecular basis of the pathogenesis of stroke显示文摘 | Sheikh Arshad Saeed Kaneez Fatima Shad Taimur Saleem | 2007 | Exp Brain Res2007，182，1： | 1 |
| 5 | Effect of different host plants on the fitness of diamondback moth, Plutella xylostella(Lepidoptera: Plutellidae)显示文摘 | Saeed R Sayyed A H Shad S A | 2010 | Crop Prot2010，29，： | 1 |
| 6 | Some new prospects in the understanding of the n,olecular basis of the pathogenesis of stroke 显示文摘 | Saeed S A Shad K F Saleem T | 2007 | Exp Brain Res2007，182，1： | 1 |
| 7 | Some new prospects in the understanding of the molecular basis of the pathogenesis of stroke显示文摘 | Saeed SA Shad KF Saleem T | 2007 | Exp Brain Res2007，182，： | 1 |
| 8 | 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 |
| 9 | 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 |
| 10 | 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 |
您所在的机构暂未开通此部分的功能，请联系管理员