The Experts below are selected from a list of 7881 Experts worldwide ranked by ideXlab platform
Moslem Fattahi - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation and rheological behaviors of water based Drilling Mud contained starch zno nanofluids through response surface methodology
Journal of Molecular Liquids, 2019Co-Authors: Limo Salehnezhad, Amir Heydari, Moslem FattahiAbstract:Abstract The study of rheological properties is one of the essential aspects in designing Drilling Mud and its performance in operational conditions. The adding nanoparticles and natural polymers such as starch in Drilling Mud is the one way for modifying rheological properties. In this research, rheological behavior of a water-based Drilling Mud containing starch and ZnO nanoparticles were investigated and optimized. The rheological parameters were modeled by means of power law and Bingham-plastic models, then they were analyzed using ANOVA. Initially ZnO nanoparticles were synthesized and characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Energy-dispersive X-ray spectroscopy (EDS). Experiments were arranged based upon the central composite design (CCD) and results were analyzed using response surface methodology (RSM). Experimental variables (starch percentage, percentage of nanoparticles and ultrasonic time) were studied at five levels and 17 experiments were obtained with three times repetitions in the center point. The obtained regression equations for the responses were the quadratic mathematical models. The main and interacting effects between variables were studied using the analysis of variance and 3D plots. The results revealed that, the rheological parameters were more influenced by the nanoparticles amount. The optimized values of starch, nanoparticle and ultrasonic time variables were obtained equal to 0.82% (wt.), 0.2% (wt.) and 65.0 (min), respectively.
Limo Salehnezhad - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation and rheological behaviors of water based Drilling Mud contained starch zno nanofluids through response surface methodology
Journal of Molecular Liquids, 2019Co-Authors: Limo Salehnezhad, Amir Heydari, Moslem FattahiAbstract:Abstract The study of rheological properties is one of the essential aspects in designing Drilling Mud and its performance in operational conditions. The adding nanoparticles and natural polymers such as starch in Drilling Mud is the one way for modifying rheological properties. In this research, rheological behavior of a water-based Drilling Mud containing starch and ZnO nanoparticles were investigated and optimized. The rheological parameters were modeled by means of power law and Bingham-plastic models, then they were analyzed using ANOVA. Initially ZnO nanoparticles were synthesized and characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Energy-dispersive X-ray spectroscopy (EDS). Experiments were arranged based upon the central composite design (CCD) and results were analyzed using response surface methodology (RSM). Experimental variables (starch percentage, percentage of nanoparticles and ultrasonic time) were studied at five levels and 17 experiments were obtained with three times repetitions in the center point. The obtained regression equations for the responses were the quadratic mathematical models. The main and interacting effects between variables were studied using the analysis of variance and 3D plots. The results revealed that, the rheological parameters were more influenced by the nanoparticles amount. The optimized values of starch, nanoparticle and ultrasonic time variables were obtained equal to 0.82% (wt.), 0.2% (wt.) and 65.0 (min), respectively.
Bjorn Henrik Hansen - One of the best experts on this subject based on the ideXlab platform.
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acute and physical effects of water based Drilling Mud in the marine copepod calanus finmarchicus
Journal of Toxicology and Environmental Health, 2017Co-Authors: Julia Farkas, Camilla Yvonne Badsvik, Dag Altin, Trond Nordtug, A Olsen, Bjorn Henrik HansenAbstract:ABSTRACTThe aim of this study was to investigate impacts of fine particulate fraction of a commonly used barite-containing Drilling Mud on the pelagic filter feeding copepod Calanus finmarchicus. The results show that the tested Drilling Mud had a low acute toxicity on C. finmarchicus (LC50 > 320 mg/L) and that the observed toxicity was likely caused by dissolved constituents in the Mud and not the particle phase containing the weighting agent barite. Further, animals were exposed to Drilling Mud at a concentration of 10 mg/L for 168 hr followed by a 100 hr recovery phase. A rapid uptake of Drilling Mud particles was observed, while the excretion was slow and incomplete even after 100 hr recovery in clean seawater. The uptake of Drilling Mud particles caused a significant increase in sinking velocity of copepods, indicating that uptake of Drilling Mud particles affected their buoyancy. Long-term exposure to low concentrations of Drilling Mud could therefore cause physical effects such as impacts on the an...
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Acute and physical effects of water-based Drilling Mud in the marine copepod Calanus finmarchicus
Journal of toxicology and environmental health. Part A, 2017Co-Authors: Julia Farkas, Camilla Yvonne Badsvik, Dag Altin, Trond Nordtug, Anders J. Olsen, Bjorn Henrik HansenAbstract:The aim of this study was to investigate impacts of fine particulate fraction of a commonly used barite-containing Drilling Mud on the pelagic filter feeding copepod Calanus finmarchicus. The results show that the tested Drilling Mud had a low acute toxicity on C. finmarchicus (LC50 > 320 mg/L) and that the observed toxicity was likely caused by dissolved constituents in the Mud and not the particle phase containing the weighting agent barite. Further, animals were exposed to Drilling Mud at a concentration of 10 mg/L for 168 hr followed by a 100 hr recovery phase. A rapid uptake of Drilling Mud particles was observed, while the excretion was slow and incomplete even after 100 hr recovery in clean seawater. The uptake of Drilling Mud particles caused a significant increase in sinking velocity of copepods, indicating that uptake of Drilling Mud particles affected their buoyancy. Long-term exposure to low concentrations of Drilling Mud could therefore cause physical effects such as impacts on the animal's buoyancy which may affect the energy budget of the copepods.
Zoubir Kessaissia - One of the best experts on this subject based on the ideXlab platform.
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Life-Cycle Impact Assessment of oil Drilling Mud system in Algerian arid area
Resources Conservation and Recycling, 2011Co-Authors: Malika Ghazi, Gaetana Quaranta, Joelle Duplay, Raja Hadjamor, Mohamed Khodja, Hamid Ait Amar, Zoubir KessaissiaAbstract:The objective of this work is to assess the environmental impacts of the Drilling Mud system in Algeria’s arid region. Water-based Mud (WBM) and oil-based Mud (OBM) are used during well Drilling in Hassi Messaoud petroleum field, and have a considerable pollution potential particularly on the aquifer system which constitutes the single resource of drinking water in the Sahara. The Life-Cycle Assessment (LCA) approach is applied to evaluate the impacts of several Drilling Mud systems across all stages of their life cycle, e.g. use, treatment and disposal. Environmental impacts of five treatments scenarios corresponding to the Drilling waste management applied in Hassi Messaoud are compared: reserve pit without treatment (burial option), secondary high centrifugation (vertical cuttings dryer), stabilisation/solidification online, stabilisation/solidification off line and thermal desorption. The impact assessment is carried on using the LCIA models of Impact 2002+ method in SIMAPRO7 software. This assessment identifies human toxicity and terrestrial eco-toxicity as the major impact categories in this specific arid context and quantifies the emissions contributions. The local environmental impact is the most important of the Drilling Mud life cycle and is mainly linked to emissions from reserve pits, treated cuttings, and Drilling phase 16 through the Turonian and Albian aquifer. The main contributing substances are aromatic hydrocarbons fraction and metals in particular barium, zinc, antimony, arsenic, and aluminium. Concerning the comparison of the treatment scenarios, it appears that stabilisation/solidification online is the best one; it has the lowest impact score in the two dominating categories because of the waste minimisation: Mud storage avoided in the reserve pit. The second best scenario is the thermal desorption which obtains the lowest impact score in carcinogen effects due to hydrocarbons reduction (
Sina Shahbazi - One of the best experts on this subject based on the ideXlab platform.
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A Criterion for Estimating the Minimum Drilling Mud Pressure to Prevent Shear Failure in Oil Wells
Geotechnical and Geological Engineering, 2020Co-Authors: Naser Behnam, Mehdi Hosseini, Sina ShahbaziAbstract:Well Drilling is considered the main activity to access oil reservoirs for oil production. Shear failure during Drilling operation occurs when Drilling Mud pressure is reduced from a certain value known as critical or rupture pressure. Therefore, a proper Drilling Mud pressure is required to avoid the occurrence of any shear failure even to the smallest extent. This study aimed at achieving a criterion for estimating the minimum Drilling Mud pressure to prevent shear failure in oil wells. To this end, data on oil wells were first collected. Then oil wells were modeled at different Drilling Mud pressures with the help of finite difference numerical program, FLAC^2D. The normalized yielded zone area (NYZA) in the elasto-plastic method was used for stability analysis and estimation of the minimum Drilling Mud pressure to prevent shear failure. After plotting the NYZA chart for each well, the minimum Drilling Mud pressure was calculated at NYZA = 1 and a correlation was then extracted by multivariate linear regression with the help of SPSS. This linear correlation is able to estimate the minimum Drilling Mud pressure to prevent shear failure taking into account the minimum and maximum horizontal stresses, pore pressure, internal friction angle and cohesion.
