| Autor: |
Abdulridha, Hayder L., Abdulaziz, Abdulaziz M., Dahab, Abdel Sattar A., Redywi, Sadiq O., Askar, Ahmed S. Abd |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 7/11/2022, Vol. 2443 Issue 1, p1-12, 12p |
| Abstrakt: |
The non-productive time due to instability issues in the under-study field has reached over 90% of wellbore problems along the production section (8½"). This paper aims to construct a calibrated three- dimensional mechanical earth model (3DMEM) that can be used to conduct a comprehensive geomechanical analysis of the trouble zones issues. The results confirmed that the shale intervals have the major difficulties encountered in the drilling operations. These intervals compared to other rock intervals have a higher Poisson's ratio (0.20- 0.24), lower Young's modulus (1.17- 4.67 Mpsi), lower friction angles (26°- 35°), and lower rock strength (5000- 17000 psi). The strike-slip fault regime covered the limestone sections except for the Maudud formation which was under the reverse regime. The normal fault regime was the controlling domain along shale beds. 3DMEM showed relative heterogeneity in rock properties, pore pressure and field stresses between the southern and northern of the field. The wellbore stability analysis showed that the most stable directional wells orientate towards the minimum horizontal stress (about 140° azimuth angle from the North clockwise) where the model revealed fewer breakout failures. Vertical and slightly inclined wells (less than 40°) presented fewer breakouts and breakdowns than the highly deviated wells. Increasing the current mud weight (in vertical wells) by 0.5 to 1.5 ppg will be significant to prevent breakout failure. The suggested mud weight for the deviated wells extends between (12-12.6 ppg). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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