د.محمد يحيي سليمان2024-12-092024-12-09https://dspace.academy.edu.ly/handle/123456789/671This dissertation comprehensively explores various aspects of hydraulic fracturing diagnostic testing with a primary focus on accurately assessing in-situ stresses and determining formation permeability. Traditional fracture injection/shut-in tests (DFIT’s) play a critical role in this assessment; however, their applicability is limited in ultra-tight formations due to prolonged test durations. To overcome this challenge, pump-in/flowback tests have been employed to expedite the testing process. However, the use of pump-in/flowback tests has declined due to uncertain and inconclusive results obtained from existing techniques found in the literature.This dissertation comprehensively explores various aspects of hydraulic fracturing diagnostic testing with a primary focus on accurately assessing in-situ stresses and determining formation permeability. Traditional fracture injection/shut-in tests (DFIT’s) play a critical role in this assessment; however, their applicability is limited in ultra-tight formations due to prolonged test durations. To overcome this challenge, pump-in/flowback tests have been employed to expedite the testing process. However, the use of pump-in/flowback tests has declined due to uncertain and inconclusive results obtained from existing techniques found in the literature.New Models and Analysis Techniques for Diagnostic Fracture Injection Tests