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Papers by Mujahid Elobeid
Ocean Engineering, Dec 31, 2023
The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North... more The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North Sea, Chinese coastal waters, and the New England coast) using bottom fixed foundations. However, much of the world's offshore wind resource lies in deeper waters where bottom-fixed foundations are not suitable, and floating platforms must be utilised. To date, the majority of floating concepts have been developed to support a single wind turbine. This leads to a high capital cost for each individual platform and consequently a high levelised cost of energy. The W2Power platform (developed by EnerOcean S.L, Spain) currently supports a pair of 6 MW wind turbines on outward-leaning towers. The design significantly reduces the cost per installed MW, increases the structure's natural period, added mass, and radiation damping. The platform, patented in 2009, was the world's first twin-turbine platform and the first to be demonstrated at sea (2019). This paper presents the hydrodynamics of a 1:40 scale model of the W2Power platform using the well-known OrcaFlex software. The analysis has been carried out under extreme and operational conditions, and the resulting hydrodynamic loads and motion response are presented. The mooring system was found to be sensitive to wave direction, particularly when propagating along the current direction. Furthermore, the results showed advantages in the hydrodynamic responses for the W2Power platform as an innovative floating system.
Arabian journal for science and engineering, Jan 25, 2018
The performances of the venturi meters for oil-water flow under real oil well operating condition... more The performances of the venturi meters for oil-water flow under real oil well operating conditions were investigated in the present experimental investigation. The pressure drop measurements were studied in Tercom flanged machined venturi meters with a beta ratio (β) = 0.4, 0.5 and 0.6 for oil-water two-phase flow experiments in a 0.0762 m (3-in.) pipe. The experimental data for different fluid mixture flow rates and water cuts were acquired using a two-phase, large-scale inclinable flow loop. Potable water and Exxsol mineral oil (D80) were used for the single-phase and two-phase oil-water experiments for the three venturi meters. The experiments were conducted for water cuts varying from 0 to 100% in steps of 20%, flow rates ranging from 2000 to 10,000 barrels per day (bpd), and for horizontal and vertical flow loop inclinations (0 • and 90 •). Real oil wells flow rates were matched by selecting test liquid flow rates. The experimental results showed that the venturi pressure drop varies as the square of the fluid flow rate for given water cut through the venturi meters studied. For given flow rate and water cut, the venturi pressure drop is inversely proportional to the venturi β; however, the venturi pressure drop varies almost linearly with the water cut for a given fluid flow rate. Within the range of test fluid flow rates, the venturi pressure drop measurements were unaffected by the inclination of the three venturi meters studied in the flow loop. This is very important from an application standpoint.
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Mar 12, 2022
The flow of oil-water in pipes commonly occurs in oil and petroleum industries and is a challengi... more The flow of oil-water in pipes commonly occurs in oil and petroleum industries and is a challenging issue. Clear understanding of the frictional pressure drop (FPD) of oil-water flows in pipes is important for determining size of pumps and pipelines in transportation of oils. An experimental investigation has been conducted for measurement of pressure drop of oil Exxsol (D130)-water two-phase flow in 6 inch diameter horizontal and vertical stainless steel annulus pipe at different flow conditions. Two-phase large scale horizontal & vertical flow loop was used to acquire data for different water cuts and fluid mixture (oil-water) flow rates. Experiments were carried out for different water cuts (WC) ranging from 0-100% and for different inclination angles (0° and 90°). The oil-water flow rates were varied from 2,000 to 12,000 barrels-per-day (BPD). Exxsol mineral oil (D130) and potable water have been used as working fluids. In order to simulate field conditions, the range of liquid flow rates used matches the range of actual flow rates in oil wells. The frictional pressure drop (FPD) has been found to decrease initially (for all flow rates) from WC=0% to WC=20%. Further increase in WC, causes FPD to increase from WC=20% to WC=40%. This is due to phase inversion. For a given WC=40%, for increase in BPD from 6,000 to 8,000, increase in FPD is about 34%. The effect of angle has found to be appreciable. For a given flow rate 8,000 BPD & WC=40%, for increase in angle from 0 to 90°, percentage increase in frictional pressure drop is about 26%. The outcomes of the study will be helpful in mitigating multi-phase flow problems in oil and petroleum industries.
Volume 8: Ocean Renewable Energy
The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North... more The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North Sea, Chinese coastal waters, and the New England coast) using bottom fixed foundations. However, much of the world’s offshore wind resource lies in deeper waters where bottom-fixed foundations are not suitable, and floating platforms must be utilised. To date, the majority of floating concepts have been developed to support a single wind turbine. This leads to a high capital cost for each individual platform and consequently a high levelised cost of energy. The W2Power platform (developed by EnerOcean S.L, Spain) currently supports a pair of 6 MW wind turbines on outward-leaning towers. The design significantly reduces the cost per installed MW, increases the structure’s natural period, added mass, and radiation damping. The platform, patented in 2009, was the world’s first twin-turbine platform and the first to be demonstrated at sea (2019). This paper presents the hydrodynamics of a 1...
Arabian Journal for Science and Engineering, 2018
The performances of the venturi meters for oil–water flow under real oil well operating condition... more The performances of the venturi meters for oil–water flow under real oil well operating conditions were investigated in the present experimental investigation. The pressure drop measurements were studied in Tercom flanged machined venturi meters with a beta ratio ($$\beta )=0.4$$β)=0.4, 0.5 and 0.6 for oil–water two-phase flow experiments in a 0.0762 m (3-in.) pipe. The experimental data for different fluid mixture flow rates and water cuts were acquired using a two-phase, large-scale inclinable flow loop. Potable water and Exxsol mineral oil (D80) were used for the single-phase and two-phase oil–water experiments for the three venturi meters. The experiments were conducted for water cuts varying from 0 to 100% in steps of 20%, flow rates ranging from 2000 to 10,000 barrels per day (bpd), and for horizontal and vertical flow loop inclinations ($$0{^{\circ }}$$0∘ and 90{^{\circ }}$$90∘). Real oil wells flow rates were matched by selecting test liquid flow rates. The experimental re...
Journal of Petroleum Science and Engineering, 2016
Abstract This study presents an experimental investigation of pressure drop measurements in a Ter... more Abstract This study presents an experimental investigation of pressure drop measurements in a Tercom flanged machined venturi meter of 0.5 beta ratio for oil-water two-phase flow in a 0.0762 m (3-in.) pipe. Two-phase large scale inclinable flow loop was used to acquire data for different water cuts and fluid mixture flow rates. Mineral oil D80 and portable water were used for the single phase and two-phase oil-water experiments. The experiments were conducted for flow rates ranging from 2000 to 12000 bpd, water cuts varying from 0% to 100% in steps of 20%, for four flow loop inclinations (0, 40, 60, and 90 degrees) from horizontal to vertical positions. The range of liquid flow rates were selected to match the actual flow rates in real oil wells to reflect field conditions. The results show that the venturi pressure drop varies parabolically with fluid flow rate for given water cut. However, the venturi pressure drop varies linearly with water cut for given fluid flow rate. The corresponding slopes increase slightly with flow rates. The flow loop inclination has no effect on the venturi pressure drop measurements at the considered flow conditions. A new modified venturi coefficient, k, which is a function of pressure losses and geometry, was defined and its value obtained from the oil-water two-phase flow experiments. The mixture venturi pressure coefficient was also defined and determined, and the average value found to be around 15.5 for all flow loop inclinations. The results indicate that the venturi pressure drop and the determined venturi coefficients are unaffected by the flow loop inclination for selected oil-water two-phase flow conditions. In this paper, attention was focused on the variables affecting the performance of the venturi meter for oil-water flow under real oil well operating conditions.
The flow of two immiscible liquids (such as oil and water) in pipes is a challenging subject that... more The flow of two immiscible liquids (such as oil and water) in pipes is a challenging subject that is rich in physics and practical applications. It is often encountered in many oil and chemical industries. The pressure gradient and flow patterns of immiscible liquids are still subject of immense research interest. This is partly because fluids with different properties exhibit different flow behaviors in different pipe’s configurations under different operating conditions. More importantly, oil-water annular flow (oil surrounded by water) is a common occurrence in oil upstream petroleum industry and is generally used for the lubricated transportation of highly viscous oil. However, despite their importance, behavior of such flows has not been explored to an appreciable extent. The present study reports pressure drop measurements of oil (D80)-water annular two-phase flow in a horizontal and inclined 6 inch diameter stainless steel pipe at different flow conditions. Experiments were c...
Ocean Engineering, Dec 31, 2023
The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North... more The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North Sea, Chinese coastal waters, and the New England coast) using bottom fixed foundations. However, much of the world's offshore wind resource lies in deeper waters where bottom-fixed foundations are not suitable, and floating platforms must be utilised. To date, the majority of floating concepts have been developed to support a single wind turbine. This leads to a high capital cost for each individual platform and consequently a high levelised cost of energy. The W2Power platform (developed by EnerOcean S.L, Spain) currently supports a pair of 6 MW wind turbines on outward-leaning towers. The design significantly reduces the cost per installed MW, increases the structure's natural period, added mass, and radiation damping. The platform, patented in 2009, was the world's first twin-turbine platform and the first to be demonstrated at sea (2019). This paper presents the hydrodynamics of a 1:40 scale model of the W2Power platform using the well-known OrcaFlex software. The analysis has been carried out under extreme and operational conditions, and the resulting hydrodynamic loads and motion response are presented. The mooring system was found to be sensitive to wave direction, particularly when propagating along the current direction. Furthermore, the results showed advantages in the hydrodynamic responses for the W2Power platform as an innovative floating system.
Arabian journal for science and engineering, Jan 25, 2018
The performances of the venturi meters for oil-water flow under real oil well operating condition... more The performances of the venturi meters for oil-water flow under real oil well operating conditions were investigated in the present experimental investigation. The pressure drop measurements were studied in Tercom flanged machined venturi meters with a beta ratio (β) = 0.4, 0.5 and 0.6 for oil-water two-phase flow experiments in a 0.0762 m (3-in.) pipe. The experimental data for different fluid mixture flow rates and water cuts were acquired using a two-phase, large-scale inclinable flow loop. Potable water and Exxsol mineral oil (D80) were used for the single-phase and two-phase oil-water experiments for the three venturi meters. The experiments were conducted for water cuts varying from 0 to 100% in steps of 20%, flow rates ranging from 2000 to 10,000 barrels per day (bpd), and for horizontal and vertical flow loop inclinations (0 • and 90 •). Real oil wells flow rates were matched by selecting test liquid flow rates. The experimental results showed that the venturi pressure drop varies as the square of the fluid flow rate for given water cut through the venturi meters studied. For given flow rate and water cut, the venturi pressure drop is inversely proportional to the venturi β; however, the venturi pressure drop varies almost linearly with the water cut for a given fluid flow rate. Within the range of test fluid flow rates, the venturi pressure drop measurements were unaffected by the inclination of the three venturi meters studied in the flow loop. This is very important from an application standpoint.
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Mar 12, 2022
The flow of oil-water in pipes commonly occurs in oil and petroleum industries and is a challengi... more The flow of oil-water in pipes commonly occurs in oil and petroleum industries and is a challenging issue. Clear understanding of the frictional pressure drop (FPD) of oil-water flows in pipes is important for determining size of pumps and pipelines in transportation of oils. An experimental investigation has been conducted for measurement of pressure drop of oil Exxsol (D130)-water two-phase flow in 6 inch diameter horizontal and vertical stainless steel annulus pipe at different flow conditions. Two-phase large scale horizontal & vertical flow loop was used to acquire data for different water cuts and fluid mixture (oil-water) flow rates. Experiments were carried out for different water cuts (WC) ranging from 0-100% and for different inclination angles (0° and 90°). The oil-water flow rates were varied from 2,000 to 12,000 barrels-per-day (BPD). Exxsol mineral oil (D130) and potable water have been used as working fluids. In order to simulate field conditions, the range of liquid flow rates used matches the range of actual flow rates in oil wells. The frictional pressure drop (FPD) has been found to decrease initially (for all flow rates) from WC=0% to WC=20%. Further increase in WC, causes FPD to increase from WC=20% to WC=40%. This is due to phase inversion. For a given WC=40%, for increase in BPD from 6,000 to 8,000, increase in FPD is about 34%. The effect of angle has found to be appreciable. For a given flow rate 8,000 BPD & WC=40%, for increase in angle from 0 to 90°, percentage increase in frictional pressure drop is about 26%. The outcomes of the study will be helpful in mitigating multi-phase flow problems in oil and petroleum industries.
Volume 8: Ocean Renewable Energy
The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North... more The deployment of offshore wind turbines has focused primarily on shallow seas (such as the North Sea, Chinese coastal waters, and the New England coast) using bottom fixed foundations. However, much of the world’s offshore wind resource lies in deeper waters where bottom-fixed foundations are not suitable, and floating platforms must be utilised. To date, the majority of floating concepts have been developed to support a single wind turbine. This leads to a high capital cost for each individual platform and consequently a high levelised cost of energy. The W2Power platform (developed by EnerOcean S.L, Spain) currently supports a pair of 6 MW wind turbines on outward-leaning towers. The design significantly reduces the cost per installed MW, increases the structure’s natural period, added mass, and radiation damping. The platform, patented in 2009, was the world’s first twin-turbine platform and the first to be demonstrated at sea (2019). This paper presents the hydrodynamics of a 1...
Arabian Journal for Science and Engineering, 2018
The performances of the venturi meters for oil–water flow under real oil well operating condition... more The performances of the venturi meters for oil–water flow under real oil well operating conditions were investigated in the present experimental investigation. The pressure drop measurements were studied in Tercom flanged machined venturi meters with a beta ratio ($$\beta )=0.4$$β)=0.4, 0.5 and 0.6 for oil–water two-phase flow experiments in a 0.0762 m (3-in.) pipe. The experimental data for different fluid mixture flow rates and water cuts were acquired using a two-phase, large-scale inclinable flow loop. Potable water and Exxsol mineral oil (D80) were used for the single-phase and two-phase oil–water experiments for the three venturi meters. The experiments were conducted for water cuts varying from 0 to 100% in steps of 20%, flow rates ranging from 2000 to 10,000 barrels per day (bpd), and for horizontal and vertical flow loop inclinations ($$0{^{\circ }}$$0∘ and 90{^{\circ }}$$90∘). Real oil wells flow rates were matched by selecting test liquid flow rates. The experimental re...
Journal of Petroleum Science and Engineering, 2016
Abstract This study presents an experimental investigation of pressure drop measurements in a Ter... more Abstract This study presents an experimental investigation of pressure drop measurements in a Tercom flanged machined venturi meter of 0.5 beta ratio for oil-water two-phase flow in a 0.0762 m (3-in.) pipe. Two-phase large scale inclinable flow loop was used to acquire data for different water cuts and fluid mixture flow rates. Mineral oil D80 and portable water were used for the single phase and two-phase oil-water experiments. The experiments were conducted for flow rates ranging from 2000 to 12000 bpd, water cuts varying from 0% to 100% in steps of 20%, for four flow loop inclinations (0, 40, 60, and 90 degrees) from horizontal to vertical positions. The range of liquid flow rates were selected to match the actual flow rates in real oil wells to reflect field conditions. The results show that the venturi pressure drop varies parabolically with fluid flow rate for given water cut. However, the venturi pressure drop varies linearly with water cut for given fluid flow rate. The corresponding slopes increase slightly with flow rates. The flow loop inclination has no effect on the venturi pressure drop measurements at the considered flow conditions. A new modified venturi coefficient, k, which is a function of pressure losses and geometry, was defined and its value obtained from the oil-water two-phase flow experiments. The mixture venturi pressure coefficient was also defined and determined, and the average value found to be around 15.5 for all flow loop inclinations. The results indicate that the venturi pressure drop and the determined venturi coefficients are unaffected by the flow loop inclination for selected oil-water two-phase flow conditions. In this paper, attention was focused on the variables affecting the performance of the venturi meter for oil-water flow under real oil well operating conditions.
The flow of two immiscible liquids (such as oil and water) in pipes is a challenging subject that... more The flow of two immiscible liquids (such as oil and water) in pipes is a challenging subject that is rich in physics and practical applications. It is often encountered in many oil and chemical industries. The pressure gradient and flow patterns of immiscible liquids are still subject of immense research interest. This is partly because fluids with different properties exhibit different flow behaviors in different pipe’s configurations under different operating conditions. More importantly, oil-water annular flow (oil surrounded by water) is a common occurrence in oil upstream petroleum industry and is generally used for the lubricated transportation of highly viscous oil. However, despite their importance, behavior of such flows has not been explored to an appreciable extent. The present study reports pressure drop measurements of oil (D80)-water annular two-phase flow in a horizontal and inclined 6 inch diameter stainless steel pipe at different flow conditions. Experiments were c...