Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength
This study investigates the intricate relationship between bit rock interactions and drilling parameters for multiple-diameter hole drilling scenarios. Two sets of experiments were conducted in the Drilling Technology Laboratory at Memorial University of Newfoundland (DTL-MUN) using a fully instrume...
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MDPI AG
2024-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/15/1/32 |
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| author | Abourawi Alwaar Ibrahim Futhiez Abdelsalam Abugharara Yahui Zhang Stephen Butt |
| author_facet | Abourawi Alwaar Ibrahim Futhiez Abdelsalam Abugharara Yahui Zhang Stephen Butt |
| author_sort | Abourawi Alwaar |
| collection | DOAJ |
| description | This study investigates the intricate relationship between bit rock interactions and drilling parameters for multiple-diameter hole drilling scenarios. Two sets of experiments were conducted in the Drilling Technology Laboratory at Memorial University of Newfoundland (DTL-MUN) using a fully instrumented Large-scale laboratory Drilling Simulator (LDS). The study contained two critical stages. Pre-coring operations using various diameter coring bits were completed to ensure thorough analysis. Next, drilling using a 5-cutter Polycrystalline Diamond Compact (PDC) bit with a larger diameter than all pre-cored holes, at constant Weight on Bit (WOB) and Revolution per Minute (RPM), was performed. The type of rock used in the experiments is a high-strength gabbro formation. Results indicate that pre-cored holes exhibited higher Rates of Penetration (ROP) than un-pre-cored holes, reflecting improved drilling performance and higher torque due to reduced bit–rock interaction area. A distinct relationship was observed between bit–rock interactions, torque, ROP, Mechanical Specific Energy (MSE), and applied WOB in multi-diameter drilling. ROP decreased as the pilot hole diameter decreased due to increased bit–rock interaction. The recorded data of WOB and the torque responses showed a decrease in amplitude as the bit–rock interface area increased, suggesting a positive interaction between drilling efficiency and downhole conditions. The modified Maurer model found a correlation between increased pilot hole diameter and decreased effective rock strength. These results highlight the significance of conducting a thorough drilling parameter analysis and the need for additional study to clarify the underlying mechanisms influencing drilling performance in multi-diameter hole drilling scenarios. |
| format | Article |
| id | doaj-art-0c8ff3813e544feea11f8b2650c1932d |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-0c8ff3813e544feea11f8b2650c1932d2025-01-10T13:14:14ZengMDPI AGApplied Sciences2076-34172024-12-011513210.3390/app15010032Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock StrengthAbourawi Alwaar0Ibrahim Futhiez1Abdelsalam Abugharara2Yahui Zhang3Stephen Butt4Faculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, CanadaFaculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, CanadaFaculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, CanadaFaculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, CanadaFaculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, CanadaThis study investigates the intricate relationship between bit rock interactions and drilling parameters for multiple-diameter hole drilling scenarios. Two sets of experiments were conducted in the Drilling Technology Laboratory at Memorial University of Newfoundland (DTL-MUN) using a fully instrumented Large-scale laboratory Drilling Simulator (LDS). The study contained two critical stages. Pre-coring operations using various diameter coring bits were completed to ensure thorough analysis. Next, drilling using a 5-cutter Polycrystalline Diamond Compact (PDC) bit with a larger diameter than all pre-cored holes, at constant Weight on Bit (WOB) and Revolution per Minute (RPM), was performed. The type of rock used in the experiments is a high-strength gabbro formation. Results indicate that pre-cored holes exhibited higher Rates of Penetration (ROP) than un-pre-cored holes, reflecting improved drilling performance and higher torque due to reduced bit–rock interaction area. A distinct relationship was observed between bit–rock interactions, torque, ROP, Mechanical Specific Energy (MSE), and applied WOB in multi-diameter drilling. ROP decreased as the pilot hole diameter decreased due to increased bit–rock interaction. The recorded data of WOB and the torque responses showed a decrease in amplitude as the bit–rock interface area increased, suggesting a positive interaction between drilling efficiency and downhole conditions. The modified Maurer model found a correlation between increased pilot hole diameter and decreased effective rock strength. These results highlight the significance of conducting a thorough drilling parameter analysis and the need for additional study to clarify the underlying mechanisms influencing drilling performance in multi-diameter hole drilling scenarios.https://www.mdpi.com/2076-3417/15/1/32drillingmechanical specific energyweight on bitpenetration ratetorque |
| spellingShingle | Abourawi Alwaar Ibrahim Futhiez Abdelsalam Abugharara Yahui Zhang Stephen Butt Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength Applied Sciences drilling mechanical specific energy weight on bit penetration rate torque |
| title | Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength |
| title_full | Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength |
| title_fullStr | Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength |
| title_full_unstemmed | Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength |
| title_short | Influence of Drilling Along Pilot Holes on Drilling Performance and Effective Rock Strength |
| title_sort | influence of drilling along pilot holes on drilling performance and effective rock strength |
| topic | drilling mechanical specific energy weight on bit penetration rate torque |
| url | https://www.mdpi.com/2076-3417/15/1/32 |
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