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Ibrahim I.Y.,Cairo University | Elmetwally M.M.,Cairo University | Abdelfattah H.,Suez University
2016 18th International Middle-East Power Systems Conference, MEPCON 2016 - Proceedings | Year: 2016

the objective of this paper is to propose a new approach to robust stabilization of power system oscillations with unstable or lightly damped rotor modes. A stabilizing robust controller using H∞ optimal control is designed for Single machine infinite bus system along with heffron phillip's K model. Also Conventional power system stabilizer and Fuzzy logic controller are designed. The simulation results show the best performance adjusts by robust H8 control. © 2016 IEEE.

Ragab A.M.S.,Future University Egypt | Ragab A.M.S.,Suez University | Snosy M.F.,General Petroleum Company
Society of Petroleum Engineers - SPE Kuwait Oil and Gas Show and Conference | Year: 2015

Ultrasonic waves have been used for improved oil recovery especially from the marginal well in so many area all over the world. The main mechanisms of the seismic pulses from ultrasonic waves is to supply oil molecules by energy to overcome capillary forces there by restructuring the relative permeability curves increasing the oil mobility. Monitoring these changes is very important for increasing the mobility of oil even after residual oil saturation achieved by water flooding. The present work discusses and investigates the laboratory effects of ultrasonic waves on the relative permeability curves by measuring it before and after applying the pulse waves. Six core samples was used from Egyptian homogeneous reservoirs, these cores are sandstone and carbonate, their permeabilities range from 67 to 460 md. In this technique. Acoustic ultrasonic waves of 500 KHZ was applied in cores is this research. At this frequency, the fluid vibrates out of phase with the solid and is forced out through the pore structure in the agglomerate. This relative fluid motion to exert high viscous stresses at the particle-particle contact points which leads to fracture of the agglomerate and the dispersion of the individual particles. The interaction of the generated waves with the fluids in the pores causes changes in relative permeability of the rock to oil and water, which may lead to improve the rate of oil production. Therefore, the results showed that applying ultrasonic waves has a higher effect in low permeability reservoirs (75 md to 460 md) and can mobilize additional quantity of crude oil. The fractional flow curve changes are also addressed and analyzed after ultrasonic wave applications. The ultimate aim of this research is to investigate the effect of the ultrasonic wave as new proposed method to improve oil recovery by changing the relative permeability curves of the reservoirs. Moreover, it can be used to determine and investigate the recovery mechanisms for improving oil recovery. © Copyright 2015, Society of Petroleum Engineers.

Ragab A.M.S.,Future University Egypt | Ragab A.M.S.,Suez University | Hannora A.E.,Future University Egypt
Society of Petroleum Engineers - SPE Kuwait Oil and Gas Show and Conference | Year: 2015

To maintain the production and improve the recovery of hydrocarbons, nano materials are introduced recently. Improved oil recovery (IOR) is the application of various techniques for increasing the quantity of the crude oil that can be recovered from a hydrocarbon oil field. Among these techniques are chemical injection, which has been an expensive method, and field applications have been decreased during the past two decades. Currently with the advent of nanotechnology, nanofluids have been launched as a cheap, efficient and environmentally friendly alternative to other chemicals. Nanomaterials has been created and proposed to be used for IOR. Several nano materials with various sizes and concentrations have been proposed. Among the various these nanomaterials, nano-silica, nano alumina, nano zinc, and nano iron with different sizes has been recommended. In the present work, two different nano materials used to improve the recovery of oil experimentally. These nano materials are; nano silica, and nano alumina. The size of each nano material is varies from 80 to 87 nm. The size and shape of each particles were examined using x-ray diffraction (XRD) and field emission-scanning electron microscope (FE-SEM) while their microanalysis was performed by Energy Dispersive System (EDS). Some these materials are prepared mechanically using ball mill such as nano silica and the others are created chemically such as nano alumina. Numerous flooding scenarios have been performed to compare between the potentials of each nanofluids used to improve the hydrocarbon recovery. A control experimental run with water flooding (WF) was performed first. The ultimate recovery factor by WF was found about 67%. Then a flooding process using each nano fluid has been conducted for three different concentrations (0.1, 0.5, and 1 wt%). The ultimate recovery factors have been measured for all of these nano fluids and they are ranging from 62% to 81 %. The reasons for this improving have been addressed and explained by measuring the viscosity of these nano fluids and interfacial tension. This research examines and analyzes the new outcomes from implementing these nanomaterials for improving oil recovery over the traditional methods. Ultimately, the knowledge gained from this work can be used to interpret and define the nanofluids improvement mechanisms, and projected a roadmap for ongoing and future work. © Copyright 2015, Society of Petroleum Engineers.

Bhran A.A.,Suez University | El-Gharbawy M.M.,Egyptian Propylene and Polypropylene Company
Journal of Natural Gas Science and Engineering | Year: 2016

The expected conversion and selectivity of the investigated propane dehydrogenated plant were not achieved due to many causes. One of causes is the inefficient performance of the gas separation and fractionation unit especially the deethanization process. Thus, the primary goal of the present work is to increase the propane and propylene recoveries as well as to overcome some operational problems of this process. In order to accomplish this goal, a change in the process configuration and in some operating conditions was suggested. The simulation tool used in this study to examine the proposed modifications is HYSYS version 8.0 with Peng-Robinson Equation of State (EoS). The validity of simulation is proved by the good correspondence between laboratory and simulation results of the modified plant. The benefits of this study were realized when our proposed modification was applied to the original plant. The results show that the modified plant in operation is capable of recovering 2235 tons/year of propane and propylene more than the original plant. It is also noted that more ethane and ethylene are separated in the modified plant. Furthermore, the modified process provides a solution to some operational problems like increased carryover in the deethanizer rectifying column. The last part of this work considered the investigation of the maximum feed stream CO2 concentration at which the plant can operate properly without freezing. © 2016 Elsevier B.V..

Attia M.,Suez University | Mahmoud M.A.,Suez University
SPE Middle East Oil and Gas Show and Conference, MEOS, Proceedings | Year: 2015

Many researchers investigated the effect of the ionic strength and the chemistry of the injected water on the oil recovery from sandstone reservoirs. They concluded that as the salinity of the injected water decreased the oil recovery increased. They studied the effect of changing the salinity of the injected water on the zeta potential. The Zeta potential decreased in case of aquifer water compared to the sea water. The new application that we used has the ability to do better than the low salinity water flooding in increasing the oil recovery from sandstone reservoirs without diluting the sea water. Sea water dilution is a costly process, the cost of the new fluid system is low and in terms of recovery it will do better than the low salinity waterflooding. The new EOR fluid system will remove the damage caused by the low salinity water and sea water flooding and also it will prevent the formation damage. In this paper we will study the effect of adding high pH fluid (chelating agent) to sea water on the sandstone rock charge. Zeta potential was measured for Berea sandstone rock with different fluids and different concentrations of the chelating agent which was added to sea water. Also the effect of the chelating agent on the surface tension and oil recovery was evaluated. The results of zeta potential showed that adding high pH chelating agent to sea water decreased the value to -33 mV less than the low salinity water (5,767 ppm) which changed the zeta value to -12mV. In addition, the zeta potential of sandstone rock will be affected by the iron concentration in the fluid. Low salinity water with 1000 ppm iron changed the value to 7 mV. But, in case of adding the chelating agent to the same fluid the effect of iron did not appear and the charge decreased to -24mV. The decrease in zeta potential value indicates more water wet rock surface and in turn, high oil recovery will be achieved. The chelating agent diluted in sea water yielded lower surface tension compared to sea water and low salinity water. The oil recovery increased by 30% after sea waterflooding when we used 5 wt% of Na4EDTA chelating agent diluted from initial concentration of 40 wt% using sea water. The recovery increase can be attributed to the change in the rock surface charge, rock dissolution, IFT reduction mechanisms. Copyright 2015, Society of Petroleum Engineers.

Ismael I.S.,Suez University | Kharbish S.,Suez University
Carpathian Journal of Earth and Environmental Sciences | Year: 2013

Adsorption of arsenic on clay surfaces is important for the natural and simulated removal of arsenic species from aqueous environments. In this investigation, two samples of clay minerals (glauconite and halloysite) in both untreated and acid activated treated forms were used for the sorption of arsenate from aqueous solution. Glauconite is mainly composed of illite/ smectite mixed layer, kaolinite and quartz. Halloysite is composed of halloysite, kaolinite, quartz, marcasite and trace amount of pyrite. Iron is existed as separated minerals (marcasite and pyrite) in the case of halloysite or present in the structure of glauconite, which play an important role in the adsorption of arsenic. Acid activation followed by calcination enhanced the adsorption capacity compared to the untreated clay minerals due to the increased surface area and pore volume. However, the increasing of acid activation leads to dissolution of iron from sorbent clay materials which in turn lead to decrease the adsorption capacity of As (V). The effects of initial As (V) concentration, contact time and pH on the adsorption of arsenic (V) by the untreated and treated glauconite and halloysite were investigated. Maximum adsorption capacity (about 93%) was recorded for treated halloysite at equilibrium conditions pH5, 240 minute contact time, arsenate concentration 0.90 mg/L, and at temperature 25°C. The adsorption kinetics of glauconite follow the Langmuir pseudo first-order model, while the adsorption kinetic of halloysite was neither fit with pseudo first-order kinetics model nor with pseudo second-order kinetics model, suggesting adsorption kinetics of halloysite should be further analysis.

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