Determination of a safe mud window and analysis of wellbore stability to minimize drilling challenges and non-productive time
| Autor: | Abbas Khaksar Manshad, Hossein Jalalifar, Masoud Aslannezhad |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Petroleum engineering
Borehole Drilling 02 engineering and technology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Instability Pore water pressure General Energy 020401 chemical engineering Drilling fluid Offshore geotechnical engineering Trajectory Geotechnical engineering 0204 chemical engineering Stability Model Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Petroleum Exploration and Production Technology. 6(3):493-503 |
| ISSN: | 2190-0558 |
| DOI: | 10.1007/s13202-015-0198-2 |
| Popis: | The instability of a wellbore is still one of the common problems during drilling. The cause of such a borehole failure can often be mitigated by suitably determining the critical mud pressure as well as the best well trajectory. Therefore, we could save the time and the cost of drilling and production significantly by precluding some drilling problems. The main objective of this paper is to apply a geomechanical model based on well data including the in situ stresses, pore pressure, and rock mechanical properties coupled with suitable rock failure criteria in order to obtain a safe mud window and a safe drilling direction. The Mogi–Coulomb failure criterion was used for deriving the failure equations for tensile and compressive failure modes. For comparison, the analysis was also carried out using the traditional Mohr–Coulomb failure criterion. Variations of wellbore inclination and azimuth were also used to recommend upper and lower mud pressure bounds and the most stable borehole orientations. The best trajectory selection for the inclined borehole was also investigated. Furthermore, the effect of drilling mud pressure and wellbore orientation (θ = 0o) and (θ = 90o) on wellbore stability and stress distribution around the wellbore was assessed. The stability model has been applied to a well located in an oilfield in Iran and showed that the new model is consistent with field experience. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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