| Autor: |
Teimouri, Behrouz, Arian, Mehran, Abdideh, Mohammad, Solgi, Ali, Maleki, Zahra |
| Předmět: |
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| Zdroj: |
Geotechnical & Geological Engineering; Sep2024, Vol. 42 Issue 7, p5769-5788, 20p |
| Abstrakt: |
Over time, and with the production from the reservoir, the pore pressure of the production layer is decreased in case of lack of a pressure source. Pressure decreases changes stress magnitude and direction directly. The change in the magnitude of stresses can lead to geomechanical changes in the reservoir and the production layers. In case the reservoir's layers are faulted, the decrease in the reservoir's pressure can activate these faults and also change the tensile strength of the wellbore wall for new drilling in the discharged layer. The present study was conducted in one of the reservoirs in the southwest of Iran. In this reservoir, three production layers with various thicknesses were examined, and the probability of reactivation of the faults and tensile strength in the initial state, and after an 1800-pound psi pressure decrease was evaluated. In layer No.1, the value of the stress path was 0.67, which due to being tangent with the critical stress value, would activate the faults in this layer with production and the decrease in the reservoir's pressure. Also Initially, the maximum allowable drilling mud weight for non-failure is 17.81–25.13 PPG. After a pressure reduction of 1800 psi, it changes to 15.07–23.42 PPG. In addition, the most resistant state of the wellbore wall is drilling with an angle of 60 degrees and in the direction of minimum horizontal stress. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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