High demand for oil and gas has led to exploration of more petroleum resources even at remote are... more High demand for oil and gas has led to exploration of more petroleum resources even at remote areas. The petroleum resources are found in deeper subsurface formations and drilling into such formations requires a well-designed drilling mud with suitable rheological properties in order to avoid or reduce associated drilling problems. This is because rheological properties of drilling muds have considerable effect on the drilling operation and cleaning of the wellbore. Mud engineers therefore use mud additives to influence the properties and functions of the drilling fluid to obtain the desired drilling mud properties especially rheological properties. This study investigated and compared the impact of barite and hematite as weighting agents for water-based drilling muds and their influence on the rheology. Water-based muds of different concentrations of weighting agents (5%, 10%, 15% and 20% of the total weight of the drilling mud) were prepared and their rheological properties determ...
Fluid flow estimation from image sequences is a challenging due to the large and complex nature o... more Fluid flow estimation from image sequences is a challenging due to the large and complex nature of fluid flow. In this work, 36 papers on optical flow models applied for fluid motion estimation from 1980 to 2015 have been reviewed. The advantages and weaknesses of the optical flow models are discussed in detail. To improve the accuracy of the optical flow models, the principle of two multi-resolution schemes is discussed. The employment of higher order models provides more accurate motion vectors than the use of the standard optical flow model; however, it suffers from computational complexity. The use of the multi-resolution framework such as wavelet decomposition will reduce this complexity, as well as improve estimation accuracy.
The use of a liquid-liquid hydrocyclone in the downhole is one the few environmentally friendly w... more The use of a liquid-liquid hydrocyclone in the downhole is one the few environmentally friendly ways by which water production can be limited, while at the same time ensure maximum recovery. The understanding of the fluid flow behaviours that bring about better separation and performance is therefore important and should not be underestimated. This work, through numerical simulation, studied the effects that the tangential inlet(s) and the height of the upper cylindrical section of a liquid-liquid hydrocyclone have on its hydrodynamics. The results showed that the single inlet hydrocyclones unlike the twin inlet types are more prone to producing asymmetrical reversal flow which meanders along the axis of the hydrocyclone. This can affect the efficiency of separation if the particles are not well segregated. The single inlet 30 mm upper cylindrical length (UCL) hydrocyclone produced the highest velocity fields that could ensure better fluid swirling and rotation, and the greatest upw...
Environmental Science and Pollution Research, 2022
This paper for the first time synthesizes novel biodiesel experimentally using low-cost feedstock... more This paper for the first time synthesizes novel biodiesel experimentally using low-cost feedstocks of coconut oil, caustic soda, and fermented palm wine contaminated by microorganisms. The alkaline catalyzed transesterification method was used for biodiesel production with minimal glycerol. The produced biodiesel was biodegradable and effective in cleaning a shoreline oil spill experiment verified by our developed oil spill radial numerical simulator. For the first time, an adaptive neuro-fuzzy inference system (ANFIS) was hybridized with invasive weed optimization (IWO), imperialist competitive algorithm (ICA), and shuffled complex evolution (SCE-UA) to predict biodiesel yield (BY) using obtained Monte Carlo simulation datasets from the biodiesel experimental seed data. The test results indicated ANFIS-IWO (MSE = 0.0628) as the best model and also when compared to the benchmarked ANFIS genetic algorithm (MSE = 0.0639). Additionally, ANFIS-IWO (RMSE = 0.54705) was tested on another coconut biodiesel data in the literature and it outperformed both response surface methodology (RMSE = 0.72739) and artificial neural network (RMSE = 0.68615) models used. The hybridized models proved to be robust for biodiesel yield modeling in addition to the produced biodiesel serving as an environmentally acceptable and cost-effective alternative for shoreline bioremediation.
This paper presents experimental measurement and analysis of a liquid-liquid hydrocyclone separat... more This paper presents experimental measurement and analysis of a liquid-liquid hydrocyclone separator to separate oil/water emulsion with 90% water cut. Measurements have been carried out at various temperatures and in-flow rates. Samples were taken before and after the separation and analyzed using InfraCal Oil/Grease Analyzer (HATR-T2). The results showed that, the hydrocyclone separator achieves separation efficiencies higher than 80%, in the flow split region between 0.6 – 0.7 for all the temperature cases considered in the experiments. Within inlet velocities range of 2.5 – 4.5 m/s, the hydrocyclone performance seems to plateau with separation efficiency remaining virtually constant for all the flow and temperature cases. The peak efficiencies for the cases at 25 o C, 30 o C, 40 o C, 50 o C and 60 o C temperatures were averagely around 80.9%, 84.1%, 85.9%, 86.5% and 87.5%, respectively. Fluid temperature slightly impacts the hydrocyclone separation performance. Separation efficie...
Cuttings transportation in non-vertical boreholes is necessary for oil and gas wells. Efficient c... more Cuttings transportation in non-vertical boreholes is necessary for oil and gas wells. Efficient cuttings removal from a wellbore during drilling is critical for cost-effective drilling as high annular cuttings buildup often leads to high risk of stuck pipe, reduced rate of penetration and other impediments to standard drilling and completion procedures. This study investigates rheological parameters influence on the removal of cuttings in non-vertical boreholes in the course of drilling. In this study, twelve mud samples with density ranging from 8.45 – 8.50 were selected to study the rheological parameters at three different annular velocities (1.91, 2.86 and 3.82 ft/sec) and three hole angles (30 o , 45 o and 70 o ) from vertical. A programme was developed using excel spreadsheet which could determine the rheological parameters and their effect on cuttings removal from non-vertical boreholes. Results showed that better sweep of drilled cuttings is favoured by increasing annular ve...
IOP Conference Series: Materials Science and Engineering, 2015
Liquid-liquid hydrocyclones have nowadays become very useful in the oil industry because of their... more Liquid-liquid hydrocyclones have nowadays become very useful in the oil industry because of their numerous applications. They can be installed downhole in the case of a well that produces higher water-oil ratios. The design of a liquid-liquid hydrocyclone for such a task is critical and every geometric part of the hydrocyclone has a part to play as far as separation is concerned. This work, through validated numerical technique, investigated the liquid-liquid hydrocyclone performance for the cases of single-inlet and dual-inlets, with different upper cylindrical lengths, specifically, 30mm and 60mm.It was observed that the hydrocyclones with the 30mm upper cylindrical section perform better than the ones with 60 mm upper cylindrical section. It was again noted that, even though higher number of tangential inlets increases the swirl intensity, they have the tendency to break up the oil droplets within the hydrocyclone because of increasing shear and jet flow interaction.
High demand for oil and gas has led to exploration of more petroleum resources even at remote are... more High demand for oil and gas has led to exploration of more petroleum resources even at remote areas. The petroleum resources are found in deeper subsurface formations and drilling into such formations requires a well-designed drilling mud with suitable rheological properties in order to avoid or reduce associated drilling problems. This is because rheological properties of drilling muds have considerable effect on the drilling operation and cleaning of the wellbore. Mud engineers therefore use mud additives to influence the properties and functions of the drilling fluid to obtain the desired drilling mud properties especially rheological properties. This study investigated and compared the impact of barite and hematite as weighting agents for water-based drilling muds and their influence on the rheology. Water-based muds of different concentrations of weighting agents (5%, 10%, 15% and 20% of the total weight of the drilling mud) were prepared and their rheological properties determ...
Fluid flow estimation from image sequences is a challenging due to the large and complex nature o... more Fluid flow estimation from image sequences is a challenging due to the large and complex nature of fluid flow. In this work, 36 papers on optical flow models applied for fluid motion estimation from 1980 to 2015 have been reviewed. The advantages and weaknesses of the optical flow models are discussed in detail. To improve the accuracy of the optical flow models, the principle of two multi-resolution schemes is discussed. The employment of higher order models provides more accurate motion vectors than the use of the standard optical flow model; however, it suffers from computational complexity. The use of the multi-resolution framework such as wavelet decomposition will reduce this complexity, as well as improve estimation accuracy.
The use of a liquid-liquid hydrocyclone in the downhole is one the few environmentally friendly w... more The use of a liquid-liquid hydrocyclone in the downhole is one the few environmentally friendly ways by which water production can be limited, while at the same time ensure maximum recovery. The understanding of the fluid flow behaviours that bring about better separation and performance is therefore important and should not be underestimated. This work, through numerical simulation, studied the effects that the tangential inlet(s) and the height of the upper cylindrical section of a liquid-liquid hydrocyclone have on its hydrodynamics. The results showed that the single inlet hydrocyclones unlike the twin inlet types are more prone to producing asymmetrical reversal flow which meanders along the axis of the hydrocyclone. This can affect the efficiency of separation if the particles are not well segregated. The single inlet 30 mm upper cylindrical length (UCL) hydrocyclone produced the highest velocity fields that could ensure better fluid swirling and rotation, and the greatest upw...
Environmental Science and Pollution Research, 2022
This paper for the first time synthesizes novel biodiesel experimentally using low-cost feedstock... more This paper for the first time synthesizes novel biodiesel experimentally using low-cost feedstocks of coconut oil, caustic soda, and fermented palm wine contaminated by microorganisms. The alkaline catalyzed transesterification method was used for biodiesel production with minimal glycerol. The produced biodiesel was biodegradable and effective in cleaning a shoreline oil spill experiment verified by our developed oil spill radial numerical simulator. For the first time, an adaptive neuro-fuzzy inference system (ANFIS) was hybridized with invasive weed optimization (IWO), imperialist competitive algorithm (ICA), and shuffled complex evolution (SCE-UA) to predict biodiesel yield (BY) using obtained Monte Carlo simulation datasets from the biodiesel experimental seed data. The test results indicated ANFIS-IWO (MSE = 0.0628) as the best model and also when compared to the benchmarked ANFIS genetic algorithm (MSE = 0.0639). Additionally, ANFIS-IWO (RMSE = 0.54705) was tested on another coconut biodiesel data in the literature and it outperformed both response surface methodology (RMSE = 0.72739) and artificial neural network (RMSE = 0.68615) models used. The hybridized models proved to be robust for biodiesel yield modeling in addition to the produced biodiesel serving as an environmentally acceptable and cost-effective alternative for shoreline bioremediation.
This paper presents experimental measurement and analysis of a liquid-liquid hydrocyclone separat... more This paper presents experimental measurement and analysis of a liquid-liquid hydrocyclone separator to separate oil/water emulsion with 90% water cut. Measurements have been carried out at various temperatures and in-flow rates. Samples were taken before and after the separation and analyzed using InfraCal Oil/Grease Analyzer (HATR-T2). The results showed that, the hydrocyclone separator achieves separation efficiencies higher than 80%, in the flow split region between 0.6 – 0.7 for all the temperature cases considered in the experiments. Within inlet velocities range of 2.5 – 4.5 m/s, the hydrocyclone performance seems to plateau with separation efficiency remaining virtually constant for all the flow and temperature cases. The peak efficiencies for the cases at 25 o C, 30 o C, 40 o C, 50 o C and 60 o C temperatures were averagely around 80.9%, 84.1%, 85.9%, 86.5% and 87.5%, respectively. Fluid temperature slightly impacts the hydrocyclone separation performance. Separation efficie...
Cuttings transportation in non-vertical boreholes is necessary for oil and gas wells. Efficient c... more Cuttings transportation in non-vertical boreholes is necessary for oil and gas wells. Efficient cuttings removal from a wellbore during drilling is critical for cost-effective drilling as high annular cuttings buildup often leads to high risk of stuck pipe, reduced rate of penetration and other impediments to standard drilling and completion procedures. This study investigates rheological parameters influence on the removal of cuttings in non-vertical boreholes in the course of drilling. In this study, twelve mud samples with density ranging from 8.45 – 8.50 were selected to study the rheological parameters at three different annular velocities (1.91, 2.86 and 3.82 ft/sec) and three hole angles (30 o , 45 o and 70 o ) from vertical. A programme was developed using excel spreadsheet which could determine the rheological parameters and their effect on cuttings removal from non-vertical boreholes. Results showed that better sweep of drilled cuttings is favoured by increasing annular ve...
IOP Conference Series: Materials Science and Engineering, 2015
Liquid-liquid hydrocyclones have nowadays become very useful in the oil industry because of their... more Liquid-liquid hydrocyclones have nowadays become very useful in the oil industry because of their numerous applications. They can be installed downhole in the case of a well that produces higher water-oil ratios. The design of a liquid-liquid hydrocyclone for such a task is critical and every geometric part of the hydrocyclone has a part to play as far as separation is concerned. This work, through validated numerical technique, investigated the liquid-liquid hydrocyclone performance for the cases of single-inlet and dual-inlets, with different upper cylindrical lengths, specifically, 30mm and 60mm.It was observed that the hydrocyclones with the 30mm upper cylindrical section perform better than the ones with 60 mm upper cylindrical section. It was again noted that, even though higher number of tangential inlets increases the swirl intensity, they have the tendency to break up the oil droplets within the hydrocyclone because of increasing shear and jet flow interaction.
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