EVALUATION OF PORE PRESSURE AND FRACTURE GRADIENT CALCULATION IN GUMAI FORMATION, X FIELD
Accurate prediction of formation pore pressure and fracture gradient is necessary in conducting safe, economical, and efficient oil and gas drilling operations. Both values are used to design drilling mud to avoid formation fracturing and prevent well kicks. The casing design and selection process a...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/75651 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Accurate prediction of formation pore pressure and fracture gradient is necessary in conducting safe, economical, and efficient oil and gas drilling operations. Both values are used to design drilling mud to avoid formation fracturing and prevent well kicks. The casing design and selection process also heavily relies on the accuracy of pore pressure and fracture gradient values.
This study analysed and evaluated the predictions of pore pressure and fracture gradient in well-P3 of X Field. The research focused on the Gumai formation, one of the exploration and development drilling targets in the South Sumatra Basin. The data used consisted of drilling parameter data, petrophysical data, and pressure test data. The drilling parameter values were corrected for equipment mechanics and drilling issues encountered in the wellbore. The Eaton method and modified Eaton method were employed for pore pressure prediction, while fracture gradient prediction was performed using the Eaton method and modified Matthew-Kelly correlation. Pore pressure and fracture gradient predictions were validated against pressure test data.
After conducting the analysis and evaluation of the predicted pore pressure and fracture gradient in the Gumai formation of X Field, it was found that the modified Eaton method provided accurate results. Regarding fracture gradient prediction, both the Eaton method and the modified Matthew-Kelly correlation yielded good correlations with LOT (leak-off test) data. The analysis and evaluation results also generated recommendations that can serve as references for future planning and drilling operations in the Gumai formation of X Field. |
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