(/0ø Ԥ6Ԥ5/Ԥ5 352&((',1*6 ɇȺɍɑɇɕȿ ɌɊɍȾɕ To obtain better simulation model for fractured basement r... more (/0ø Ԥ6Ԥ5/Ԥ5 352&((',1*6 ɇȺɍɑɇɕȿ ɌɊɍȾɕ To obtain better simulation model for fractured basement reservoirs, one of the important research trend is to improve of workflow and method for calibrating model parameters to dynamic data (history matching). Analyzing challenges and solutions in fractured reservoir simulation in general and basement fractured ones in particular, a workflow for calibrating model parameters to dynamic data has been proposed. At each step of the workflow, calibration routine is accomplished using Computer-Assisted History Matching techniques. To perform calibration workflow with five steps by using computer-assisted history matching techniques, three computer programs have been developed. This paper presents our study in developing methodology and accompanied computer tools
The paper presents a numerical method to simulate two-phase turbulent cavitating flows in ducts o... more The paper presents a numerical method to simulate two-phase turbulent cavitating flows in ducts of varying cross-section usually faced in engineering. The method is based on solution of two-phase Reynolds-averaged Navier-Stokes equations of two-phase mixture. The numerical method uses artificial compressibility algorithm extended to unsteady flows with dual-time technique. The discreted method employs an implicit, characteristic-based upwind differencing scheme in the curvilinear grid systems. Numerical simulation of an unsteady three-dimensional two-phase cavitating flow in a duct of varying cross-section with available experiment was performed. The unsteady important characteristics of the unsteady flow can be observed in results of numerical simulation. Comparison of predicted results with experimental data for time-averaged velocity and phase fraction are provided.
On the base of the method suggested by G. I. Marchuc for the problem of optimal location of an ai... more On the base of the method suggested by G. I. Marchuc for the problem of optimal location of an air-pollution object1 such as newly built plant1 in a region in which one or several habitations arrange, in this paper a numerical algorithm is proposed. The Hybrid scheme applied for the three-dimensional transport equation permits to integrate it with large enough time step that is very important factor when the program is running on PC. As an example, a calculation for an arbitrary wind field is conducted.
In the paper the rheological properties of crude oil of White Tiger oil-field (Vietnam) and its e... more In the paper the rheological properties of crude oil of White Tiger oil-field (Vietnam) and its emulsion with sea-water, including measurement results and analytical approximation formulae for wide range of pressure, temperature and water concentration, are presented. As it is known, the crude oil of White Tiger oil-field is a high-paraffin and high-viscous oil. At the low temperature (T ≤ 40°C) it behaves as non-Newtonian fluid of Bingham-Shvedov group. Therefore, beside the effective viscosity, the effective dynamic shear stress is also measured and approximated. The rheological properties of crude oil and emulsion of crude oil and water are also measured and approximated for the case when the mixture contains 0.1% chemical reagent ES-3363.
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2010
Efficiency of oil production process using water injection to maintain reservoir pressure is stro... more Efficiency of oil production process using water injection to maintain reservoir pressure is strongly depend on allocation of injection and production rates among the wells. The first part of paper presents principle and mathematical basis for application of optimization algorithms and Artificial Neural Network (ANN) in combination with reservoir simulator for problem of well rate reallocation to minimize water cut. The remaining part of the paper presents our study for evaluating effectiveness of several conventional optimization algorithms and the feed-forward back-propagation ANN. These different solution methods have been used for the same optimization problem with a synthetic reservoir model. The improvements of objective function have been obtained with all the methods. The comparison of obtained results also shows advantages and drawbacks of the methods. The study has already shown the capability of optimization algorithms and ANN in solving the problem of optimizing allocation of injection and production rates in multi-well water-flooding projects.
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2012
To obtain better simulation model for fractured basement reservoirs, one of the important researc... more To obtain better simulation model for fractured basement reservoirs, one of the important research trend is to improve of workflow and method for calibrating model parameters to dynamic data (history matching). Analyzing challenges and solutions in fractured reservoir simulation in general and basement fractured ones in particular, a workflow for calibrating model parameters to dynamic data has been proposed. At each step of the workflow, calibration routine is accomplished using Computer-Assisted History Matching techniques. To perform calibration workflow with five steps by using computer-assisted history matching techniques, three computer programs have been developed. This paper presents our study in developing methodology and accompanied computer tools
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2010
geomechanical stability plays an important role in the development of long and deep wells. Boreho... more geomechanical stability plays an important role in the development of long and deep wells. Borehole collapse, circulation losses and sand production are costly problems for the petroleum production. in the study presented here, a model based on mohr-Coulomb failure criterion is used to analyze wellbore stability for three synthetic cases with different stress regimes. For each case, the analyses are performed to select wellbore inclination and azimuth for instability minimization. after the most stable well direction is selected, the analyses are carried out to determine free-sanding bottomhole flowing pressure (BHp) associated with different values of reservoir pressure in order to predict potential of sanding in the future production process. the study shows that geomechanical stability analysis can provide valuable supports for selecting wellbore trajectory and controlling sand production.
Urban air pollution is one of the unsettled issues in urban development and planning process. Urb... more Urban air pollution is one of the unsettled issues in urban development and planning process. Urban street canyons are one of the main focused areas of investigation due to the heavy emission of the pollutants from vehicles. In the present study, the effects of elevated metro rail track (EMRT) on pollutant dispersion phenomena have been studied using computational fluid dynamics (CFD) technique. As a practical application of a CFD model, k-ε turbulence model was applied for airflow modelling. Species transport model was applied for pollutant dispersion modelling. Geometrical configuration of urban street canyon of aspect ratio 'one', with elevated metro rail track, has been considered. Numerical simulations were carried out for perpendicular wind flow. Pollutant concentrations, at various locations of the street canyon, were largely affected by the introduction of elevated metro rail track. These results were compared with the street canyon without elevated metro rail track. It has been observed that the pollutant concentration increased at lower region and decreased at the upper region of the street canyon. Variations were not uniformly distributed in street canyon volume. Contours and pollutant concentrations have been compared and discussed for different sampled locations in the street canyon.
A finite-volume code is developed to compute the turbulent airflow over small- scale complex terr... more A finite-volume code is developed to compute the turbulent airflow over small- scale complex terrain. A pressure-correction algorithm is used to solve the three-dimensional non-hydrostatic flow equations. The turbulent transport is simulated by the k- € model using some modifications suitable for atmospheric boundary-layer application. As an example, the model is used to simulate the flow-field around a cubical building. The same flow as a towing-tank experiment of USEPA was simulated using our code. These simulations show that, the model was capable of simulating recirculation zones behind the building. The results of calculation are also compared with available measurement data.
The objective of the paper is to study numerically, using k -€ model, the cirlculation zone behin... more The objective of the paper is to study numerically, using k -€ model, the cirlculation zone behind a building under neutral and stable conditions. The influences of wind speed, vert ical gradient of the temperature, surface roughness and building height on the length and structure of the recirculation zone are investigated. The research result showed that the recirculation area extends from immediately behind the building to a distance bf about 2.5 times, in maximum, of the dimension of the building. The recirculation zone's 1 length increases with the increase of wind speed, decreases with the increase of vertical gradient of the temperature, decreases with the increase of roughness and increases with the increa~e of building height . Some exceptions of two last tendencies may occur for the cases of high surface roughness or high building, when the flow shift from a simple one-vortex to a complex multiple-vortex structure.
(/0ø Ԥ6Ԥ5/Ԥ5 352&((',1*6 ɇȺɍɑɇɕȿ ɌɊɍȾɕ To obtain better simulation model for fractured basement r... more (/0ø Ԥ6Ԥ5/Ԥ5 352&((',1*6 ɇȺɍɑɇɕȿ ɌɊɍȾɕ To obtain better simulation model for fractured basement reservoirs, one of the important research trend is to improve of workflow and method for calibrating model parameters to dynamic data (history matching). Analyzing challenges and solutions in fractured reservoir simulation in general and basement fractured ones in particular, a workflow for calibrating model parameters to dynamic data has been proposed. At each step of the workflow, calibration routine is accomplished using Computer-Assisted History Matching techniques. To perform calibration workflow with five steps by using computer-assisted history matching techniques, three computer programs have been developed. This paper presents our study in developing methodology and accompanied computer tools
The paper presents a numerical method to simulate two-phase turbulent cavitating flows in ducts o... more The paper presents a numerical method to simulate two-phase turbulent cavitating flows in ducts of varying cross-section usually faced in engineering. The method is based on solution of two-phase Reynolds-averaged Navier-Stokes equations of two-phase mixture. The numerical method uses artificial compressibility algorithm extended to unsteady flows with dual-time technique. The discreted method employs an implicit, characteristic-based upwind differencing scheme in the curvilinear grid systems. Numerical simulation of an unsteady three-dimensional two-phase cavitating flow in a duct of varying cross-section with available experiment was performed. The unsteady important characteristics of the unsteady flow can be observed in results of numerical simulation. Comparison of predicted results with experimental data for time-averaged velocity and phase fraction are provided.
On the base of the method suggested by G. I. Marchuc for the problem of optimal location of an ai... more On the base of the method suggested by G. I. Marchuc for the problem of optimal location of an air-pollution object1 such as newly built plant1 in a region in which one or several habitations arrange, in this paper a numerical algorithm is proposed. The Hybrid scheme applied for the three-dimensional transport equation permits to integrate it with large enough time step that is very important factor when the program is running on PC. As an example, a calculation for an arbitrary wind field is conducted.
In the paper the rheological properties of crude oil of White Tiger oil-field (Vietnam) and its e... more In the paper the rheological properties of crude oil of White Tiger oil-field (Vietnam) and its emulsion with sea-water, including measurement results and analytical approximation formulae for wide range of pressure, temperature and water concentration, are presented. As it is known, the crude oil of White Tiger oil-field is a high-paraffin and high-viscous oil. At the low temperature (T ≤ 40°C) it behaves as non-Newtonian fluid of Bingham-Shvedov group. Therefore, beside the effective viscosity, the effective dynamic shear stress is also measured and approximated. The rheological properties of crude oil and emulsion of crude oil and water are also measured and approximated for the case when the mixture contains 0.1% chemical reagent ES-3363.
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2010
Efficiency of oil production process using water injection to maintain reservoir pressure is stro... more Efficiency of oil production process using water injection to maintain reservoir pressure is strongly depend on allocation of injection and production rates among the wells. The first part of paper presents principle and mathematical basis for application of optimization algorithms and Artificial Neural Network (ANN) in combination with reservoir simulator for problem of well rate reallocation to minimize water cut. The remaining part of the paper presents our study for evaluating effectiveness of several conventional optimization algorithms and the feed-forward back-propagation ANN. These different solution methods have been used for the same optimization problem with a synthetic reservoir model. The improvements of objective function have been obtained with all the methods. The comparison of obtained results also shows advantages and drawbacks of the methods. The study has already shown the capability of optimization algorithms and ANN in solving the problem of optimizing allocation of injection and production rates in multi-well water-flooding projects.
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2012
To obtain better simulation model for fractured basement reservoirs, one of the important researc... more To obtain better simulation model for fractured basement reservoirs, one of the important research trend is to improve of workflow and method for calibrating model parameters to dynamic data (history matching). Analyzing challenges and solutions in fractured reservoir simulation in general and basement fractured ones in particular, a workflow for calibrating model parameters to dynamic data has been proposed. At each step of the workflow, calibration routine is accomplished using Computer-Assisted History Matching techniques. To perform calibration workflow with five steps by using computer-assisted history matching techniques, three computer programs have been developed. This paper presents our study in developing methodology and accompanied computer tools
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2010
geomechanical stability plays an important role in the development of long and deep wells. Boreho... more geomechanical stability plays an important role in the development of long and deep wells. Borehole collapse, circulation losses and sand production are costly problems for the petroleum production. in the study presented here, a model based on mohr-Coulomb failure criterion is used to analyze wellbore stability for three synthetic cases with different stress regimes. For each case, the analyses are performed to select wellbore inclination and azimuth for instability minimization. after the most stable well direction is selected, the analyses are carried out to determine free-sanding bottomhole flowing pressure (BHp) associated with different values of reservoir pressure in order to predict potential of sanding in the future production process. the study shows that geomechanical stability analysis can provide valuable supports for selecting wellbore trajectory and controlling sand production.
Urban air pollution is one of the unsettled issues in urban development and planning process. Urb... more Urban air pollution is one of the unsettled issues in urban development and planning process. Urban street canyons are one of the main focused areas of investigation due to the heavy emission of the pollutants from vehicles. In the present study, the effects of elevated metro rail track (EMRT) on pollutant dispersion phenomena have been studied using computational fluid dynamics (CFD) technique. As a practical application of a CFD model, k-ε turbulence model was applied for airflow modelling. Species transport model was applied for pollutant dispersion modelling. Geometrical configuration of urban street canyon of aspect ratio 'one', with elevated metro rail track, has been considered. Numerical simulations were carried out for perpendicular wind flow. Pollutant concentrations, at various locations of the street canyon, were largely affected by the introduction of elevated metro rail track. These results were compared with the street canyon without elevated metro rail track. It has been observed that the pollutant concentration increased at lower region and decreased at the upper region of the street canyon. Variations were not uniformly distributed in street canyon volume. Contours and pollutant concentrations have been compared and discussed for different sampled locations in the street canyon.
A finite-volume code is developed to compute the turbulent airflow over small- scale complex terr... more A finite-volume code is developed to compute the turbulent airflow over small- scale complex terrain. A pressure-correction algorithm is used to solve the three-dimensional non-hydrostatic flow equations. The turbulent transport is simulated by the k- € model using some modifications suitable for atmospheric boundary-layer application. As an example, the model is used to simulate the flow-field around a cubical building. The same flow as a towing-tank experiment of USEPA was simulated using our code. These simulations show that, the model was capable of simulating recirculation zones behind the building. The results of calculation are also compared with available measurement data.
The objective of the paper is to study numerically, using k -€ model, the cirlculation zone behin... more The objective of the paper is to study numerically, using k -€ model, the cirlculation zone behind a building under neutral and stable conditions. The influences of wind speed, vert ical gradient of the temperature, surface roughness and building height on the length and structure of the recirculation zone are investigated. The research result showed that the recirculation area extends from immediately behind the building to a distance bf about 2.5 times, in maximum, of the dimension of the building. The recirculation zone's 1 length increases with the increase of wind speed, decreases with the increase of vertical gradient of the temperature, decreases with the increase of roughness and increases with the increa~e of building height . Some exceptions of two last tendencies may occur for the cases of high surface roughness or high building, when the flow shift from a simple one-vortex to a complex multiple-vortex structure.
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