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| 1 | A modified failure criterion for transversely isotropic rocks显示文摘A modified failure criterion is proposed to determine the strength of transversely isotropic rocks. Mechanical properties of some metamorphic and sedimentary rocks including gneiss, slate, marble, schist,shale, sandstone and limestone, which show transversely isotropic behavior, were taken into consideration. Afterward, introduced triaxial rock strength criterion was modified for transversely isotropic rocks.Through modification process an index was obtained that can be considered as a strength reduction parameter due to rock strength anisotropy. Comparison of the parameter with previous anisotropy indexes in literature showed reasonable results for the studied rock samples. The modified criterion was compared to modified Hoek-Brown and Ramamurthy criteria for different transversely isotropic rocks. It can be concluded that the modified failure criterion proposed in this study can be used for predicting the strength of transversely isotropic rocks. | Omid Saeidi Vamegh Rasouli Rashid Geranmayeh Vaneghi Raoof Gholami Seyed Rahman Torabi | 2014 | Geoscience Frontiers2014，5，2： | 16 |
| 2 | Significant aspects of carbon capture and storage–A review显示文摘Excessive emission of greenhouse gases into the atmosphere has resulted in a progressive climate change and global warming in the past decades.There have been many approaches developed to reduce the emission of Carbon Dioxide(CO2)into the atmosphere,among which Carbon Capture and Storage(CCS)techniques has been recognized as the most promising method.This paper provides a deeper insight about the CCS technology where CO2 is captured and stored in deep geological formations for stabilization of the earth's temperature.Principles of capturing and storage for a long-term sequestration are also discussed together with the processes,mechanisms and interactions induced by supercritical CO2 upon injection into subsurface geological sites. | Arshad Raza Raoof Gholami Reza Rezaee Vamegh Rasouli Minou Rabiei | 2019 | Petroleum2019，5，4： | 7 |
| 3 | A nano-particle based approach to improve filtration control of water based muds under high pressure high temperature conditions显示文摘There have been many attempts to improve the filtration control of water based muds under High Pressure High Temperature(HPHT)condition using a cost effective approach.Nano particles are perhaps the best option considering their successful applications reported in many studies.However,they are often expensive and pose unfavourably changes on the rheology of the muds.In this paper,an attempt was made to show the application of Nano Glass Flakes(NGFs)as a cheap but effective nano particle to control the filtration of water based muds under HPHT conditions.Performing a series of rheology,filtration and conductivity tests on the mud samples with unmodified NGFs revealed that this nano particle increases the mud rheology,yield point and gel strength of the mud with a slight impact on the filtration loss.However,by modifying the surface charges of NGFs with a cationic surfactant,filtration loss was significantly reduced without any severe impacts on the mud rheology.Considering the conductivity of the mud which increases by adding the modified NGF,this nano particle might be a good choice to improve the overall performance of water based muds under HPHT conditions. | Ong Siong Guan Raoof Gholami Arshad Raza Minou Rabiei Nikoo Fakhari Vamegh Rasouli Omid Nabinezhad | 2020 | Petroleum2020，6，1： | 2 |
| 4 | Investigating the validity of conventional joint set clustering methods显示文摘 | Behzad Tokhmechi Hossein Memarian Behzad Moshiri Vamegh Rasouli Hossein Ahmadi Noubari | 2011 | Engineering Geology2011，，3： | 1 |
| 5 | An analytical model to predict the volume of sand during drilling and production显示文摘Sand production is an undesired phenomenon occurring in unconsolidated formations due to shear failure and hydrodynamic forces. There have been many approaches developed to predict sand production and prevent it by changing drilling or production strategies. However, assumptions involved in these approaches have limited their applications to very specific scenarios. In this paper, an elliptical model based on the borehole shape is presented to predict the volume of sand produced during the drilling and depletion stages of oil and gas reservoirs. A shape factor parameter is introduced to estimate the changes in the geometry of the borehole as a result of shear failure. A carbonate reservoir from the south of Iran with a solid production history is used to show the application of the developed methodology. Deriving mathematical equations for determination of the shape factor based on different failure criteria indicate that the effect of the intermediate principal stress should be taken into account to achieve an accurate result. However, it should be noticed that the methodology presented can only be used when geomechanical parameters are accurately estimated prior to the production stage when using wells and field data. | Raoof Gholami Bernt Aadnoy Vamegh Rasouli Nikoo Fakhari | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，4： | 1 |
| 6 | A Data Processing Algorithm Proposed for Identi- fication of Breakout Zones in TightforMations: A case Study in Barnett Gas Shale显示文摘 | Hamed Soroush Vamegh Rasouli Behzad Tokhmechi | 2010 | Journal of Petroleum Science and Engineering2010，，74： | 1 |
| 7 | A modified empirical criterion for strength of transversely anisotropic rocks with metamorphic origin显示文摘 | Omid Saeidi Rashid Geranmayeh Vaneghi Vamegh Rasouli Raoof Gholami | 2013 | Bulletin of Engineering Geology and the Environment2013，，2： | 1 |
| 8 | Fracture detection from water saturation log data using a Fourier–wavelet approach显示文摘 | Behzad Tokhmechi Hossein Memarian Vamegh Rasouli Hossein Ahmadi Noubari Behzad Moshiri | 2009 | Journal of Petroleum Science and Engineering2009，，1： | 1 |
| 9 | The influence of perturbed stresses near faults on drilling strategy: A case study in Blacktip field, North Australia显示文摘 | Vamegh Rasouli Zachariah John Pallikathekathil Elike Mawuli | 2010 | Journal of Petroleum Science and Engineering2010，，1： | 1 |
| 10 | Comparison of lattice and pseudo 3D numerical simulation of tip screen out operation显示文摘Hydraulic fracturing(HF)is a commonly used technique to stimulate low permeability formations such as shale plays and tight formations.However,this method of well stimulation has also been used in high permeable unconsolidated sandstone formations to bypass near-wellbore formation damage and prevent sand production at some distance apart from the wellbore wall.The treatment is called frac-pack completion,where a short length but wide width fracture is formed by injecting aggressive concentrations of proppant into the fracture plane.This operation is known as tip screen-out(TSO).Detailed design of fluid and proppant,including an optimal pump schedule,is required to achieve satisfactory TSO.In this study,we first assess the lattice-based numerical method's capabilities for simulating hydraulic fracturing propagation in elastoplastic formation.The results will be compared with the same case simulation results using a pseudo 3D(P3D)model and analytical model.Second,we explore the Nolte(1986)design for frac-pack and TSO treatment using lattice-based software and the P3D model.The results showed that both models could simulate the hydraulic fracturing propagation in soft formation and TSO operation,while some differences were observed in generated geometry,the tip screenout time and net pressure profiles.The results are presented.It was noted that fracture propagation regime(viscosity/toughness),nonlocality and nonlinearity had an influence on the different geometries.The advantages of each model will be discussed. | Ahmed Merzoug Vibhas Pandey Vamegh Rasouli Branko Damjanac Hui Pu | 2023 | Petroleum2023，9，3： | 0 |
| 11 | Study the suitability of neem seed oil for formulation of eco-friendly oil based drilling fluid显示文摘The present work intended to develop an invert emulsion drilling mud from biodegradable neem seed oil as an alternative to conventional diesel-based drilling mud.This would present comparable properties and performances with API standard requirements,ecologically friendly and at a low cost.Biodiesel produced from non-edible neem oil was used as the continuous phase in an invert emulsion-based drilling mud.Different tests to investigate the applicability of the mud for drilling applications were conducted.The rheological and lubricity tests results indicate that the neem oil biodiesel-based drilling muds are comparable with conventional diesel-based drilling muds.The produced biodiesel shows a significantly better flash point of 168℃ than the traditional diesel flash point of 70℃;indicating better fire safety than the conventional diesel.The lubricity and rheological data indicate the formulated mud with neem seed oil biodiesel fair reasonably well with conventional diesel and within the API requirements.In general,the preliminary results show that neem oil biodiesel is a potential alternative to conventional organic oil in formulating oil-based drilling mud in terms of technical and environmental analysis. | Adesina Fadairo Gbadegesin Adeyemi Temitope Ogunkunle Kegang Ling Vamegh Rasouli Elijah Effiong James Ayoo | 2021 | Petroleum Research2021，6，3： | 0 |
| 12 | An improved model for severe slugging stability criteria in offshore pipeline-riser systems显示文摘Flow assurance has been a major challenge in petroleum production systems especially in offshore operations where severe slugging is a dominant aching issue.This is characterized by pulsating flow behavior which impacts the reservoir productivity,pipeline-riser systems,and surface facilities(separator).The only means so far,of delivering reservoir fluids from offshore wells to the separator at the surface is by pipeline-riser systems where slugging is most prominent and oftentimes unavoidable.Though passive and active measures have been deployed over time to mitigate the associated problem,there is the need to develop a predictive tool for mitigating offshore slugging in the riser system.This study involves the use of a model and analysis approach to eliminate severe slugging based on the balance of forces acting on the pipeline-riser system.Modified stability criteria which consider accumulation and frictional pressure drops have been developed.The current approach is solely physicsdriven,to predict the corresponding liquid and gas velocities at which the fluctuations would be severe when producing multiphase fluids through pipeline-riser systems.By balancing the forces acting on a riser-pipeline system and accounting for frictional and accumulation effects,two hydraulic flow modeling approaches have been used in this study to improve the criteria for predicting the condition of severe slugging.The developed criteria were computed using MATLAB/Simulink and a severe slugging flow map was generated.The“new study 1”and“new study 2”showed a 16%and 13%increase respectively in predicted unstable cases than the Malekzadeh criteria.The criteria were tested at different separator pressures.The Taitel and Jansen criteria could not predict severe slugging at elevated separator pressure.Notwithstanding,the developed flow maps using the“new study 1”are more reliable than the“new study 2”.This is because the“new study 2”approach over defines the physics of severe slugging.The criteria were also tested at varying accumulation times.This was done by step increments in the order of magnitude of time.The separator pressure affects the optimal time for modeling the accumulation at the riser-base.The criteria are therefore useful for predicting optimal operating conditions for flow assurance for the pipeline-riser system in consideration. | Adesina Fadairo Chinemerem Obi Kegang Ling Vamegh Rasouli Olumuyiwa Aboaba Olumide Gbadamosi | 2022 | Petroleum Research2022，7，3： | 0 |
| 13 | A numerical study to assess the effect of heterogeneity on CO_(2) storage potential of saline aquifers显示文摘Many parameters have been indicated crucial for the selection of a saline aquifer as a carbon dioxide(CO_(2))storage site.However,less attention has been given to the impact of heterogeneity on the performance of these storage media.Thus,the heterogeneity effect was evaluated in this paper by adopting a numerical modeling approach and the existing screening criterion developed for the aquifers was updated.The updated criterion for CO_(2)storage purpose would enhance the confidence level during the selection of deep saline aquifer and thus,help to address the climate change issue.The numerical modeling was carried out via CO_(2)STORE module of Eclipse300 Simulator to evaluate the effect of different levels of heterogeneity on CO_(2)storage potential.Different degrees of heterogeneity from homogenous systems to highly heterogeneous systems in the model were incorporated through the Lorenz coefficient.In this way,simulation of nine cases was carried out for three different aquifers with different porosity values.A comparison of these results showed that heterogeneity causes the aquifer to have lower storage capacity.On the trapping potential,dissolution trapping was significant and the amount of free gas in all cases was minimum.In addition,the aquifer with the highest level of heterogeneity(HLH)had a minimum fraction of residual trapping regardless of porosity.It was also found that final pressure at the end of 30 years is the same and high for low-level heterogeneity(LLH)and medium level heterogeneity(MLH)cases and low for HLH,while the injection rate stability duration is least for HLH and maximum for LLH.Based on the results obtained,it can be concluded that low to medium level heterogeneous aquifers with a good porosity can be a suitable choice for CO_(2)storage. | Zain Rasheed Arshad Raza Raoof Gholami Minou Rabiei Atif Ismail Vamegh Rasouli | 2020 | Energy Geoscience2020，1，1： | 0 |
| 14 | An approach to improve wellbore stability in active shale formations using nanomaterials显示文摘Drilling through active shale formations has been a challenging practice in the oil and gas industry for a long period of time,given the complexity of shale structure and its interaction with Water Based Muds(WBMs).Although there have been many additives and methodologies proposed for a safe drilling through shale formations using WBMs,little success has been reported to the application of these methods once tested under different field conditions.In this paper,a new WBM formulated by nanomaterials was proposed to stabilize active shale layers during drilling.A series of rheological,density,filtration loss,bentonite dispersion and shale recovery tests were conducted on the mud samples formulated by nanosilica and Nano Glass Flakes(NGFs).The results indicated that NGF,as a cheap but effective nanomaterial,is able to significantly reduce the flirtation loss without posing any significant impacts on the density and the rheology of WBMs.It also appeared that the bentonite molecules were incapable to either hydrate or disperse in the drilling fluid system in the presence of NGFs.It seems that NGFs can stabilize clay minerals and reduce the filtration loss as remarkably efficient additive,but caution must be taken to ensure that they are properly disperse in the WBMs. | Raoof Gholami Arshad Raza Minou Rabiei Nikoo Fakhari Punissha Balasubramaniam Vamegh Rasouli Ramasamy Nagarajan | 2021 | Petroleum2021，7，1： | 0 |
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