Digital Repository for faculty of Engineering

Abstract

The Nubian Sandstone of Lawer Cretaceous Formation is located in Sarir Oil Field, in the Southeastern Sirte Basin in Libya. After conductiog 300 point counts on 24 thin sections from C4 -65&C3 -65. The deposition environment and diagenesis that affected the variability of porosity and permeability within a given lithologic unit. I found the Nubian Sandstone bodies of Sarir-C-North can also be divided on the basis of grian size and sedimentary structure into type: - 1) medium to coarse- grained sandstone 2) very fine grains sandstone. Association in the former lithologic, the siltstone and silty sandstone are grey and usually laminated; while in the latter they form white-grey or reddish siltstone and shaly siltstone beds, commonly intensively burrowed, and locally contain fragments of coal. A different depositional environment deposited each lithology. The Nubian Sandstone is interpreted to include several lithofacies deposited in fluvial environment. It informal these facies controlled both the primary porosity and diagenetic events. Peterophysical properties of formation under study were determined using different well logs. Porosities are calculated using sonic, neutron, and density logs. It is clear that the primary porosity in (well C3 -65) of formation represents dominant one and the secondary is (well C4- 65) of rare.
ليلي المبروك (2008)

Abstract

The number of mobile service users has been tremendously increased during the last few years, and the types of mobile services are developed from pure voice to data and multimedia services, such as audio/video streaming, e-mail, file transfer, and web browsing. These services have quite different requirements for their quality. 3G WCDMA cellular mobile networks answer this growing demand for these wireless data services. Then it needs to provide a huge capacity and wide area of coverage with acceptable quality of service. Capacity and coverage in WCDMA networks planning are the important issues because they are dependent of each other and related to the services data rate. In this thesis the capacity and coverage of mixed rate services are derived and analyzed. The uplink Capacity Coverage Product (CCP) of mixed rate services is developed by two methods, and three scenarios are assumed. The first method is the exact solution and the second method is the approximate solution. Math lap computer programs are used to get results and curves. Then some parameters affecting the mixed rate CCP are studied and a comparison between the two methods is also performed.The application of CCP in dimensioning and planning of a single service and mixed rate services WCDMA network is presented. A comparison with the conventional planning method is performed.
علي صالح منصور (2008)

Abstract

The sandstone of Upper Ordovician Mamuminyat Formation represents part of stratigraphic column in Murzuq Basin, south west Libya. It is the primary reservoir target in the basin, soursed and caped by Lower Silurian Tanezzuft Shale (Sola, 2000). The Mammuniyat reservoir in Murzuq Basin is characterized by lateral and vertical variation of petrophysical properties duo to lateral change of depositional environment and the digenetic effect on the formation load various facies deposition quality. The Concession NC174 is discovered in 1997 by Lasmo Grand Maghreb Limited then On the 26th October 2003 the development drilling campaign started by MOG till thepresent time. The El feel field is the major discovery in NC174. Porosity range is 16-18% and permeability some hundreds millidarcys. The Net thickness/Gross thickness ratio varies from 20% to 95% with an average value of 70%. The sedimentary fill in the Murzuq basin is mainly Paleozoic to Mesozoic in age and reaches a thickness of about 4000 meters in the depocenter. The sedimentary sequence is punctuated by several regional unconformities corresponding to successive tectonic activity phases. In the area of NC174, the tectonic phases developed anticlines and fault bounded anticlines generally super-imposed and re-actived through time. The resulting structural style is characterized mainly by poli-history sub-vertical reverse faults with different directions (N-S, NNW-SSE and NNE-SSW), these faults bound most of the prospects apparently superimposed on subtle anticlines oriented SSWNNE along which the culminations are aligne.
خالد مسعود الزوام (2014)

Abstract

The static behavior of large deflection of plates is considered. The w-F governing equations for large deflection of plates are derived and Solved using Finite Element with Galerkin approach to calculate the static deflection and for parameter values which span the design space. An Incremental Iterative technique were used. The Galerkin Method was used to derive the element stiffness matrix and load victor. A three node- 18DOF Triangle Element was selected to calculate the nodal field variables. Two boundary conditions were considered, the simply supported and clamped plates. A well prepared program used for plates with small deflection,, Linear Problem,, was modified to handle the changes in the governing equations and apply the solution techniques. A good fit with previous published studies was found.
القاسم محمد كامور (2009)

Abstract

The success of projects are depends on the people involve and how they tackle the design of the projects for specific needs, planning of activities, budget cost and execution to achieve the ultimate goal. Each phase of the project contributes an important task and this will reflect on how good the project management handled by the team.Project management means managing all the relevant activities of the project within the given constraints of time and cost, however , to complete specified project as per schedule and within the allocated budget, an accurate planning and optimization of all available resources will be required to complete all the tasks.During the projects, changes can occur even though the original scope may have been carefully planned. These changes might occur at any times and in ways that are unexpected.Changes during project execution can significantly affect not only time schedule but may affect also the economical aspect of the project. This phenomenon can be considered as normal and experienced world wide especially in the third world countries wherein lack of technical knowledge and resources are major problems.This study concerns the majority of the managerial changes occurred during the project execution step and the role of the organization in handling such changes as competitive and finding solutions in order to manage the project effectively.Many oil companies in Libya were facing numerous problems in the delay of project implementation, poor quality management, planning and poor performance which deviate from the required project objectives. Changes that occur later in the implementation cause serious problems in delaying the project schedule and increasing costs, effectively are reducing the benefits of the project.By Appling the questionnaire that consists of 30 specific questions which have been distributed to 13 Companies under umbrella of National Oil Corporation (N.O.C). Eight out of thirteen companies were responded.The analysis of the data collected from submitted questionnaire has been analyzed using Microsoft Excel 2000. That allows simple setting and manipulation of the data collected.Statistical data and interviews on the respondent companies indicate the following items: Full dependency on the external contractors to fully execute the project implementation that leads to high cost of contracts (EPC contracts).Poor supervision leading to significant delay of the implementation of the project. (Specifically of E P contracts).The Project Implementation profile (PIP technique) has been used on this study to evaluate one of the project which had delay and some other related problems selected random as case study. The analysis covered all the factors for project implementation. Technical factor.Managerial factors.Controlling factors. In order to improve the project management for oil & gas companies listed in this research and to overcome such problems. This study recommends a good communication and coordination system connecting all local petroleum companies and providing data exchange which enables to minimize time, cost personnel and learn from mistakes.
زينب مختار المصري (2007)

Abstract

This research was an attempt to use the currently available activity coefficient methods with universal sets of parameters to simultaneously predict ternary liquid-liquid equilibrium data. The focus of this research was to calculate phase equilibrium data within fair error using set of Parameters obtained from the above-mentioned models. The significance of this work is to study the liquid-liquid phase equilibrium of the ternary system at several temperatures and to test the capability of the various equilibrium models to correlate these data. A series of liquid-liquid equilibrium measurements were performed by changing the composition of the mixture.The prepared mixtures were placed in the extraction vessel and stirred for 2 h and then left to settle for 4 h. Samples were taken by a syringe from both the upper phase and lower layers. Both phases were analyzed using gas chromatography equipped. Liquid-liquid equilibrium for the ternary system acetonitrile + benzene + n-heptane was measured at 298,313,333 K. The results were used to estimate the interaction parameters between each of the three compounds for the NRTL and UNIQUAC models as a function of temperature. The estimated interaction parameters were successfully used to predict the equilibrium compositions by the two models. The UNIQUAC equation was the most accurate model in correlating the overall equilibrium compositions of the studied system. NRTL models satisfactorily predicted the equilibrium compositions. In each of the mentioned the ternary system, the calculated and experimental data were compared. The root mean square deviation (RMSD) between the observed and calculated mole percent for NRTL, UNIQUAC was 1.44%, 1.35% for acetonitrile + benzene + n-heptane
عماد الدين محمد الزغداني (2014)

Abstract

this study aims to investigate the hydrological cycle at wadi Zaghadnah basin in Tarhuna in terms of (rainfall-surface run-off-evaporation-infiltration) and estimation of the quantity of surface water , and to predict the maximum flood can happen in order to reduce hazardous to houses and farms that are found on my profile of the valley was the use of a series of years of readings rainfall and results have indicated to the fact that annual average rainfall was (238) mm, via using (Isohyetal method).The quantity of water which is supposed to be reserved in the dam was (1.94) million cubic meters. As for rain test, it was found that it is random and non-coherent. Having studied rain-wave relation through application of modelprediction statistical, it was deduced that it is not reliable to depend-upon in forecasting the expected rain. Results have indicated that total evaporation average to (2324.5)mm via using (CROPWAT) and average annual infiltration is (2065.17)mm, and post application of some statistic equations like probability log-Pearson Type ׀׀׀distribution and Gumbels distribution-plotting (25-50-100-1000), maximum possible amount (via using the aforesaid three methods) was found, but due to silt and likely erosion of soils as a result of flooding, silt amounts in Dom lake was estimated by using calculative equations was (5622)m³/year.
عيادة محمد ميلاد اليونسى (2012)

Abstract

This study covers the Fields producting from the Gialo Formation a reservoir which is composed of Limestone and Dolomitic-Limestone and consists mainly of highly altered Nummulitic Packstone. This study was achieved through three parts of study including a petrographic study, petrophysical study of reservoir properties from core analysis and borehole logs. The general geological framework was obtained from petrographical study of thirty six thin sections, 129 representative core plug data and logs from 5 different wells are utilized to better understanding the petrophysical framework of the formation. The plots correlating petrophsical parameters and the frequency histograms suggested the presence of distinctive reservoir trends. These discriminations were also represented in Winland porosity- permeability cross plots resulted in clusters for different port-size that are responsible for different flow characteristics. Linear and multiple regression were used for the study of each unit. The permeability models were constructed and their reliabilies were compared by the regression coefficients for predictions in un-cored well. The combination of all data revealed the worst ranked reservoir quality corresponded to moldic and intergranular pore types, which occurred mainly in the Bioclastic Wackstone facies. The highest ranked reservoir quality corresponded to intragranular and intergranular which occurred mainly in the Nummulitic Packstone Facies.
وردة الشوشان (2010)