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This paper is an investigation on North Gialo Field to enhance the oil recovery by stimulating the main reservoir, the Upper Nubian Sandstone, which is affected by pervasive diagenetic modifications of porosity and permeability. The significant increase in the production rate after hydraulic fracturing treatment shows the importance of implementing this method for this formation in Libya for optimising production. And moreover, to gain better recovery of the stored hydrocarbon in this reservoir. The sensitivity of this case that is required a critical treatment with a precaution investigation during the operation such as High Strength Proppant, type of proppant, sieve size, conductivity indication, production estimation, Net Present Value, and the comparison between treated and untreated cases. Furthermore, deeper Nubian Sandstone formation and the treatment temperature up to 149 °C. Therefore, choosing the delayed borate crosslinked fluid by using Hydroxy Propyl Guar (HPG), gelling agent and special additives designed to enhance the viscosity at a higher temperature, to break the viscosity at the end of the end of the pump time and good proppant transport. Another benefit of the additives is stable fluid rheology, low fluid loss properties, and good cleanup properties. Post-stimulation data were collected, and the evaluation was performed in order to calibrate and improve the current models and future stimulation treatment within the North Nubian Sandstones. [ABSTRACT FROM AUTHOR]

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Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based on empirical data from the selected oil fields. Results are presented in two ways: according to the surfaces of irregular geometric bodies, and their gravity with the scattering of results, i.e., on smaller and greater possibilities of interpreting results when there are small differences in outputs. Finally, a sensitivity analysis of the model is presented. [ABSTRACT FROM AUTHOR]