Şiddet günümüzün önemli sorunlarındandır ve hastanelerin acil servis üniteleri şiddete maruz kalm... more Şiddet günümüzün önemli sorunlarındandır ve hastanelerin acil servis üniteleri şiddete maruz kalma riskinin daha fazla olduğu ortamlardandır. Muğla ilinde gerçekleştirilen bu tanımlayıcı çalışma, kamu hastaneleri acil servislerinde görevli sağlık çalışanlarının şiddete maruz kalma durumlarının incelenmesi amacıyla yapılmıştır. Gereç ve Yöntem: Çalışma; Muğla il ve ilçe kamu hastaneleri acil servislerinde çalışan toplam 280 sağlık personeli evreni, çalışmaya katılmayı kabul eden 198 sağlık personeli örneklemi oluşturmuştur. Verilerin toplanmasında, araştırmacılarca literatür doğrultusunda oluşturulmuş 40 soruluk anket formu kullanılmıştır. Veriler bilgisayar ortamında sayı yüzde hesaplamaları ile ki-kare testi kullanılarak değerlendirilmiştir. Bulgular: Araştırmaya katılanların %69,7'si kadın, %76,8'i hemşire ve %57,6'sı 0-5 yıldır acil serviste çalışmaktadır. Çalışanların %90,4'ü sözel şiddete, %23,2'si fiziksel şiddete maruz kalmıştır. Sözel şiddet olgularının çoğu hasta yakını tarafından gerçekleştirilmiştir. Şiddete maruziyet sonrası çalışanlarda en çok öfke ve işten soğuma duyguları saptanmıştır. Fiziksel şiddetin bildirim/ raporlama oranı %64 olarak belirlenmiş, şiddete maruz kalanlarda psikolojik destek alma oranları ise çok düşük bulunmuştur. 1-5 yıl süredir acil serviste çalışanlarda şiddete maruz kalma oranları daha yüksek olup şiddete maruz kalanların çoğunda çalıştığı birimi değiştirme isteği belirlenmiştir. Sonuç: Sonuç olarak; çalışanların güvenliğini sağlamaya yönelik tedbirlerin arttırılması, yasal yaptırımların caydırıcılığının sağlanması, ülkemizde daha etkin ve planlı şiddet önleme programlarının uygulanması gerektiği düşünülmektedir.
Journal of Petroleum Exploration and Production Technology, 2020
Producing an oilfield in a cost-effective way depends on how long water production could be delay... more Producing an oilfield in a cost-effective way depends on how long water production could be delayed in the reservoir. Many flow mechanisms, correlations, and methods to calculate maximum water-free oil production rate have been published, However, those methods have generally failed to not consider the skin effect which affects the flow into the wellbore. In this paper, the semi-analytical perforation skin model as presented by Karakas and Tariq is incorporated into the Meyer and Garder correlation for critical oil rate from a perforated vertical well interval to obtain the maximum water-free oil production rate and optimal perforation parameters. The resulting coupled computational model is used to determine the sensitivity of the maximum water-free oil production rate to wellbore perforation parameters. Whilst an increase in perforation length and decrease in spacing between perforation increase the critical flow rate, an increase in perforation radius did not translate to higher ...
Journal of Petroleum Exploration and Production Technology, 2017
A statistical technique for the pore-scale analyses of heterogeneity and representative elemental... more A statistical technique for the pore-scale analyses of heterogeneity and representative elemental volume (REV) in unconventional shale rocks is hereby presented. First, core samples were obtained from shale formations. The images were scanned using microcomputed tomography (micro-CT) machine at 6.7 lm resolution with voxels of 990 9 990 9 1000. These were then processed, digitised, thresholded, segmented and features captured using numerical algorithms. This allows the segmentation of each sample into four distinct morphological entities consisting of pores, organic matter, shale grains and minerals. In order to analyse the degree of heterogeneity, Eagle Ford parallel sample was further cropped into 96 subsamples. Descriptive statistical approach was then used to evaluate the existence of heterogeneity within the subsamples. Furthermore, the Eagle Ford parallel and perpendicular samples were analysed for volumetric entities representative of the petrophysical variable, porosity, using corner point cropping technique. The results of porosity REV for Eagle ford parallel and perpendicular indicated sample representation at 300 lm voxel edge. Both pore volume distribution and descriptive statistical analyses suggested that a wide variation of heterogeneity exists at this scale of investigation. Furthermore, this experiment allows for adequate extraction of necessary information and structural parameters for pore-scale modelling and simulation. Additional studies focusing on re-evaluation at higher resolution are recommended.
Rheological properties of drilling mud formulated from ten samples of Nigerian clay and treated w... more Rheological properties of drilling mud formulated from ten samples of Nigerian clay and treated with sodium carbonate (Na 2 CO 3) were determined. Four different formulations were made: A (22.5 g / 350 ml of mud + 0% Na 2 CO 3), B (22.5 g / 350 ml of mud + 10% Na 2 CO 3), C (25 g / 350 ml of mud + 10% Na 2 CO 3) and D (28 g / 350 ml of mud + 10% Na 2 CO 3). None of the samples tested in their natural state exhibited remarkable improvement in rheological properties. However, as the concentration of sodium carbonate in 22.5 g / 350 ml of mud increased to 10% in all the samples, the highest percent increase of 525% in shear stress at 1022 s-1 was observed. As clay concentration increased to 25 and 28 g / 350 ml at 10% sodium carbonate concentration, an additional increase in shear stress of 32 and 29% was observed respectively. This resulted in an increase in the apparent viscosity, plastic viscosity and yield point of the mud by 298, 32 and 29% in B, 205, 10 and 7% in C, and 9500, 90 ...
Rheological properties are to be designed before the usage so as to succeed in any drilling opera... more Rheological properties are to be designed before the usage so as to succeed in any drilling operations. Hence, local clay was processed to ensure excellent material, then factorial experiments of three levels of mass concentration, four levels of sodium carbonate and four levels of gum Arabic as treatments were designed. Fann model 286 rheometer was used to determine the shear stress at different shear rates from which plastic viscosity, apparent viscosity and yield point were calculated. The accuracy of the models gotten were substantiated by the adjusted R -squared values of 0.994, 0.865 and 0.990 gotten for apparent viscosity, plastic viscosity and yield point models respectively alongside comparison of experimental results and model prediction results. The advantages of this design are to examine the treatment variations and investigate effective way of examining interaction effects of the treatments. Thus, it makes predetermination of the treatment of mud properties to be at ea...
International Journal of Oil, Gas and Coal Technology, 2010
This study evaluates the rheological properties of beneficiated mud using factorial design. Four-... more This study evaluates the rheological properties of beneficiated mud using factorial design. Four-speed rheometer was used to determine the shear stress at different shear rates from which rheological properties were determined. The effect of increase in concentration of Gum Arabic and sodium carbonate on apparent viscosity at different mass of clay sample was investigated. Simultaneous increase in concentration of sodium carbonate and Gum Arabic at 22.5 g, 30 g and 40 g mass of clay sample lead to a tremendous increase in apparent viscosity in the range: 4.2 and 8.8 cp for 22.5 g; 5.25 and 13.7 for 30 g; as well as 5.25 and 28.8 for 40 g of sample. Result of the investigation show that there is a close agreement between the experimental and predicted data which are interpreted from the adjusted R-squared values of 0.994, 0.865 and 0.990 gotten for apparent viscosity, plastic viscosity and yield point models respectively.
A statistical technique for the pore-scale analyses of heterogeneity and representative elemental... more A statistical technique for the pore-scale analyses of heterogeneity and representative elemental volume (REV) in unconventional shale rocks is hereby presented. First, core samples were obtained from shale formations. The images were scanned using microcomputed tomography (micro-CT) machine at 6.7 lm resolution with voxels of 990 9 990 9 1000. These were then processed, digitised, thresholded, segmented and features captured using numerical algorithms. This allows the segmentation of each sample into four distinct morphological entities consisting of pores, organic matter, shale grains and minerals. In order to analyse the degree of heterogeneity, Eagle Ford parallel sample was further cropped into 96 subsamples. Descriptive statistical approach was then used to evaluate the existence of heterogeneity within the subsamples. Furthermore, the Eagle Ford parallel and perpendicular samples were analysed for volumetric entities representative of the petrophysical variable, porosity, using corner point cropping technique. The results of porosity REV for Eagle ford parallel and perpendicular indicated sample representation at 300 lm voxel edge. Both pore volume distribution and descriptive statistical analyses suggested that a wide variation of heterogeneity exists at this scale of investigation. Furthermore, this experiment allows for adequate extraction of necessary information and structural parameters for pore-scale modelling and simulation. Additional studies focusing on re-evaluation at higher resolution are recommended.
Şiddet günümüzün önemli sorunlarındandır ve hastanelerin acil servis üniteleri şiddete maruz kalm... more Şiddet günümüzün önemli sorunlarındandır ve hastanelerin acil servis üniteleri şiddete maruz kalma riskinin daha fazla olduğu ortamlardandır. Muğla ilinde gerçekleştirilen bu tanımlayıcı çalışma, kamu hastaneleri acil servislerinde görevli sağlık çalışanlarının şiddete maruz kalma durumlarının incelenmesi amacıyla yapılmıştır. Gereç ve Yöntem: Çalışma; Muğla il ve ilçe kamu hastaneleri acil servislerinde çalışan toplam 280 sağlık personeli evreni, çalışmaya katılmayı kabul eden 198 sağlık personeli örneklemi oluşturmuştur. Verilerin toplanmasında, araştırmacılarca literatür doğrultusunda oluşturulmuş 40 soruluk anket formu kullanılmıştır. Veriler bilgisayar ortamında sayı yüzde hesaplamaları ile ki-kare testi kullanılarak değerlendirilmiştir. Bulgular: Araştırmaya katılanların %69,7'si kadın, %76,8'i hemşire ve %57,6'sı 0-5 yıldır acil serviste çalışmaktadır. Çalışanların %90,4'ü sözel şiddete, %23,2'si fiziksel şiddete maruz kalmıştır. Sözel şiddet olgularının çoğu hasta yakını tarafından gerçekleştirilmiştir. Şiddete maruziyet sonrası çalışanlarda en çok öfke ve işten soğuma duyguları saptanmıştır. Fiziksel şiddetin bildirim/ raporlama oranı %64 olarak belirlenmiş, şiddete maruz kalanlarda psikolojik destek alma oranları ise çok düşük bulunmuştur. 1-5 yıl süredir acil serviste çalışanlarda şiddete maruz kalma oranları daha yüksek olup şiddete maruz kalanların çoğunda çalıştığı birimi değiştirme isteği belirlenmiştir. Sonuç: Sonuç olarak; çalışanların güvenliğini sağlamaya yönelik tedbirlerin arttırılması, yasal yaptırımların caydırıcılığının sağlanması, ülkemizde daha etkin ve planlı şiddet önleme programlarının uygulanması gerektiği düşünülmektedir.
Journal of Petroleum Exploration and Production Technology, 2020
Producing an oilfield in a cost-effective way depends on how long water production could be delay... more Producing an oilfield in a cost-effective way depends on how long water production could be delayed in the reservoir. Many flow mechanisms, correlations, and methods to calculate maximum water-free oil production rate have been published, However, those methods have generally failed to not consider the skin effect which affects the flow into the wellbore. In this paper, the semi-analytical perforation skin model as presented by Karakas and Tariq is incorporated into the Meyer and Garder correlation for critical oil rate from a perforated vertical well interval to obtain the maximum water-free oil production rate and optimal perforation parameters. The resulting coupled computational model is used to determine the sensitivity of the maximum water-free oil production rate to wellbore perforation parameters. Whilst an increase in perforation length and decrease in spacing between perforation increase the critical flow rate, an increase in perforation radius did not translate to higher ...
Journal of Petroleum Exploration and Production Technology, 2017
A statistical technique for the pore-scale analyses of heterogeneity and representative elemental... more A statistical technique for the pore-scale analyses of heterogeneity and representative elemental volume (REV) in unconventional shale rocks is hereby presented. First, core samples were obtained from shale formations. The images were scanned using microcomputed tomography (micro-CT) machine at 6.7 lm resolution with voxels of 990 9 990 9 1000. These were then processed, digitised, thresholded, segmented and features captured using numerical algorithms. This allows the segmentation of each sample into four distinct morphological entities consisting of pores, organic matter, shale grains and minerals. In order to analyse the degree of heterogeneity, Eagle Ford parallel sample was further cropped into 96 subsamples. Descriptive statistical approach was then used to evaluate the existence of heterogeneity within the subsamples. Furthermore, the Eagle Ford parallel and perpendicular samples were analysed for volumetric entities representative of the petrophysical variable, porosity, using corner point cropping technique. The results of porosity REV for Eagle ford parallel and perpendicular indicated sample representation at 300 lm voxel edge. Both pore volume distribution and descriptive statistical analyses suggested that a wide variation of heterogeneity exists at this scale of investigation. Furthermore, this experiment allows for adequate extraction of necessary information and structural parameters for pore-scale modelling and simulation. Additional studies focusing on re-evaluation at higher resolution are recommended.
Rheological properties of drilling mud formulated from ten samples of Nigerian clay and treated w... more Rheological properties of drilling mud formulated from ten samples of Nigerian clay and treated with sodium carbonate (Na 2 CO 3) were determined. Four different formulations were made: A (22.5 g / 350 ml of mud + 0% Na 2 CO 3), B (22.5 g / 350 ml of mud + 10% Na 2 CO 3), C (25 g / 350 ml of mud + 10% Na 2 CO 3) and D (28 g / 350 ml of mud + 10% Na 2 CO 3). None of the samples tested in their natural state exhibited remarkable improvement in rheological properties. However, as the concentration of sodium carbonate in 22.5 g / 350 ml of mud increased to 10% in all the samples, the highest percent increase of 525% in shear stress at 1022 s-1 was observed. As clay concentration increased to 25 and 28 g / 350 ml at 10% sodium carbonate concentration, an additional increase in shear stress of 32 and 29% was observed respectively. This resulted in an increase in the apparent viscosity, plastic viscosity and yield point of the mud by 298, 32 and 29% in B, 205, 10 and 7% in C, and 9500, 90 ...
Rheological properties are to be designed before the usage so as to succeed in any drilling opera... more Rheological properties are to be designed before the usage so as to succeed in any drilling operations. Hence, local clay was processed to ensure excellent material, then factorial experiments of three levels of mass concentration, four levels of sodium carbonate and four levels of gum Arabic as treatments were designed. Fann model 286 rheometer was used to determine the shear stress at different shear rates from which plastic viscosity, apparent viscosity and yield point were calculated. The accuracy of the models gotten were substantiated by the adjusted R -squared values of 0.994, 0.865 and 0.990 gotten for apparent viscosity, plastic viscosity and yield point models respectively alongside comparison of experimental results and model prediction results. The advantages of this design are to examine the treatment variations and investigate effective way of examining interaction effects of the treatments. Thus, it makes predetermination of the treatment of mud properties to be at ea...
International Journal of Oil, Gas and Coal Technology, 2010
This study evaluates the rheological properties of beneficiated mud using factorial design. Four-... more This study evaluates the rheological properties of beneficiated mud using factorial design. Four-speed rheometer was used to determine the shear stress at different shear rates from which rheological properties were determined. The effect of increase in concentration of Gum Arabic and sodium carbonate on apparent viscosity at different mass of clay sample was investigated. Simultaneous increase in concentration of sodium carbonate and Gum Arabic at 22.5 g, 30 g and 40 g mass of clay sample lead to a tremendous increase in apparent viscosity in the range: 4.2 and 8.8 cp for 22.5 g; 5.25 and 13.7 for 30 g; as well as 5.25 and 28.8 for 40 g of sample. Result of the investigation show that there is a close agreement between the experimental and predicted data which are interpreted from the adjusted R-squared values of 0.994, 0.865 and 0.990 gotten for apparent viscosity, plastic viscosity and yield point models respectively.
A statistical technique for the pore-scale analyses of heterogeneity and representative elemental... more A statistical technique for the pore-scale analyses of heterogeneity and representative elemental volume (REV) in unconventional shale rocks is hereby presented. First, core samples were obtained from shale formations. The images were scanned using microcomputed tomography (micro-CT) machine at 6.7 lm resolution with voxels of 990 9 990 9 1000. These were then processed, digitised, thresholded, segmented and features captured using numerical algorithms. This allows the segmentation of each sample into four distinct morphological entities consisting of pores, organic matter, shale grains and minerals. In order to analyse the degree of heterogeneity, Eagle Ford parallel sample was further cropped into 96 subsamples. Descriptive statistical approach was then used to evaluate the existence of heterogeneity within the subsamples. Furthermore, the Eagle Ford parallel and perpendicular samples were analysed for volumetric entities representative of the petrophysical variable, porosity, using corner point cropping technique. The results of porosity REV for Eagle ford parallel and perpendicular indicated sample representation at 300 lm voxel edge. Both pore volume distribution and descriptive statistical analyses suggested that a wide variation of heterogeneity exists at this scale of investigation. Furthermore, this experiment allows for adequate extraction of necessary information and structural parameters for pore-scale modelling and simulation. Additional studies focusing on re-evaluation at higher resolution are recommended.
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Papers by James Adeleye