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poroelastic
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Wellbore Stability Analysis in Multiple Wells
, M.Sc. Thesis Sharif University of Technology ; Goodarznia, Iraj (Supervisor)
Abstract
In an oil field, there always have been several wells which are produced or injected for several years, parameters such as pore pressure, temperature and stresses have been altered due to these production and injection wells. Having knowledge about the changes in mentioned parameters, new wellbores will confronts instability during drilling in high depth and sensitive layers. This thesis deals with the wellbore instability of sandstone formation with special focus on the effects of stresses and pore pressure changes caused by production and/or injection wells in the vicinity of the area that the new well would be drilled, to begin with the general assumptions and input parameters used in the...
Prediction of Hydraulic Fracturing Technology in Naturally Fractured Rocks, by Considering Immiscible Two-phase Flow
, Ph.D. Dissertation Sharif University of Technology ; Taghikhani, Vahid (Supervisor) ; Ayatollahi, Shahab (Supervisor) ; Shad, Saeed (Supervisor) ; Ranjbaran, Abdolrasul ($item.subfieldsMap.e)
Abstract
To have a deeper understanding of Hydraulic fracturing operation, in this study four important parts in this field was developed and simulated. In the first part, continuity and momentum equations for a single phase flow in a propagating penny-shaped fracture inside an impermeable matrix was revisited based on a fixed coordinate system. Its correctness was validated against experimental data and its features were compared with the well-known lubrication theory in analytical form. The new derived continuity equation caused the fracture tip to have a positive and finite pressure while, the conventional model predicted negative infinity for that. In the second part, Finite Volume method was...