DSpace@Sebhau

The digital repository of the University of Sebha

Everything published by Sebha University through the digital portal or digital repository is for the purposes of scientific research and to support researchers in the fields of science, medicine, education, agriculture, engineering, and literature.

The digital repository also aims to give university students the opportunity to obtain university publications and facilitate the process of conducting scientific research by taking advantage of the huge stock of the digital repository. One of the primary goals of the Sebha University digital repository is the policy of open knowledge exchange (Open Access) with Arab and international universities. Another goal of the digital repository is to prevent the re-publishing of any material issued by the university, including theses, dissertations, or books, again.

 

Communities in DSpace

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Now showing 1 - 5 of 10

Recent Submissions

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Modifying the filtration properties of water-based Drilling fluids using extracted virgin olive cellule
(جامعة سبها, 2024) محمد مختار يوسف; علي عبدالرحمن محمد; مفتاح عمر مفتاح
This study explores the potential of cellulose extracted from olive kernels (OKC) and olive pomace (OPC) as a modifier for drilling fluid properties. The cellulose, when integrated into real drilling fluid, exhibited minimal impact on pH levels and density across various concentrations. Plastic viscosity peaked at 0.1% and 0.25%, indicating potential overload points. Yield strength fluctuations correlated with changes in viscosity, impacting system performance. Increasing cellulose concentration in bentonite resulted in elevated salinity level , thus the optimal filtration efficiency was achieved at 0.025% cellulose concentration from Olive kernels Overall, cellulose from olive in both samples ( kernels & pomace ) showcased promising potential in enhancing drilling fluid performance, controlling circulation loss, and modifying the mud filtration cake, thus serving as a viable alternative to CMC.
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Enhancing Oil Recovery in Sandstone Core Samples Using Zeolite, Sodium & Potassium Hydroxide, Slica, AL, Addition to Formation Water
(جامعة سبها, 2023) حمد أبوبكر محمد; طاهر محمد إبراهيم
This research project explores the effectiveness of adding zeolites to formation water for enhancing oil recovery. The demand for fossil fuels, particularly oil, remains significant for meeting global energy needs. However, primary oil production methods fall short in extracting most of the original oil-in-place (OOIP). Enhanced Oil Recovery (EOR) methods are employed to address this challenge. Among these methods, water flooding plays a vital role in increasing oil production by maintaining reservoir pressure and displacing oil from pore spaces, leading to improved ultimate oil recovery. To enhance the efficiency of water flooding, various chemicals have been tested and proven effective when added to the injected water. These include smart water injection, carbonated water injection, surfactant solutions, polymers, alkalis, mutual solvents, and foam injection. Zeolites, known for their porous structure and ion-exchange properties, have gained prominence in numerous industrial applications, including EOR. This research investigates the impact of adding zeolites to formation water on oil recovery. The research issue arises from the recognition that formation water alone may not efficiently recover oil due to oil properties and rock characteristics. The aim of this study is to determine whether the inclusion of zeolites in formation water can enhance oil recovery. Experiments are conducted on sandstone core samples obtained from a Libyan field in the Murzuq basin, using oil with a density of g/cc. The findings of this research hold significance for fields subjected to water injection in Libya, as successful implementation of zeolites could substantially increase the country's daily oil production rate. The experimental results demonstrate that the addition of zeolite, sodium hydroxide, potassium hydroxide, silica, and aluminum significantly improves oil recovery at higher temperatures for sandstone core samples. Furthermore, the inclusion of sodium hydroxide yields superior oil recovery compared to potassium hydroxide. Using 15% of sodium and potassium hydroxides yields better results than other percentages, although the underlying cause is not explored in this study. Additionally, the combination of zeolite, sodium and potassium hydroxides, silica, and aluminum enhances oil recovery, warranting further investigation into the underlying mechanisms
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Phase behaviours study using different types of surfactant
(جامعة سبها, 2024) بوزيد يوسف إبراهيم; علي فرج عبدالله
In this research, three types of surfactants were used: the first type is Sodium Dodecyl Sulfate SDS, the second type is commercial soap, and the third type is laboratory-prepared soap. Three soaps with different proportions were placed in a test tube containing an equal proportion of oil and water The samples were divided into two phases, one containing the original water salinity and the other containing the water salinity diluted to half. By exposing the samples to a different temperature, a layer of microemulsion was formed in both the soap that was prepared in the laboratory and the commercial soap. It was found that the first type of Sodium Dodecyl Sulfate SDS sulfactan mixed oil with water, and the microemulsion layer did not form.
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Experimental study of a solar water heater for effect of solar radiation and mass Flow Rates
(جامعة سبها, 2024) علي عبدالسلام الزين; انشراح أحمد بشير