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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 48101 (66)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Goodarznia, Iraj
- 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 models are presented, afterward in-situ stresses and pore pressure are computed for each model in different coordinates. Common stress analysis is totally coupled with fluid flow equations to seek concurrent solutions for strain-displacement and pore pressure distribution. New data obtained from previous models are inputted as the new parameters in single well model and stability analysis is performed at different inclinations (0 – 90), azimuth and well pressures (over-balanced _ under-balanced), also Mogi-Coulomb failure criteria used as suitable and adequate failure criteria for wellbore stability analysis in this work
- Keywords:
- Borehole Stability ; Multiple Wells ; Hole Collapse ; Poroelastic ; Strength Criterion
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