الفهرس 
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Abstract
The aim of this thesis was to conduct a study on improving hydraulic fracturing effectiveness in depleted and low-pressure reservoirs in the Egyptian Western Desert using foamed and nitrogen-energized fluids. Foamed and energized fluids fracturing have been used in both conventional and unconventional reservoirs, as they reduce the amount of water used and hence minimize deleterious impact on water-sensitive formations, they also aid in the flow-back operations after treatment in reservoirs where drawdown is limited and are not capable to flow fracturing fluids after stimulation treatment. Studying the effect of using 20 to 45% N2 energized fluids (NEF) on the fracture geometry and production data through surface well testing and live production data, showed excellent and sustainable production rates. An economical study is presented through comparing the total capital cost of both NEF and conventional fluids fracturing, in addition to the hydrocarbon recovery of wells after both types.