| Autor: |
John Emesi, Samson Omoregie, Willhelm Tien, Ayodele Akinfolarin, J. C. Mordi, Mike Usim, Obinna Amah, Chiwar Djauro, Isijokelu Ijeh |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Day 1 Tue, August 11, 2020. |
| DOI: |
10.2118/203603-ms |
| Popis: |
Drilling long open hole sections has been known to result in many challenges including wellbore instability problems which may lead to stuck pipe problems. However, well design or operational challenges may necessitate making such risky decisions. In such situations, precautionary measures will need to be taken to ensure that the hole is successfully drilledwith minimum to no wellbore instability problems which have negative impact on time and cost. The case study, well FX-3 is a well drilled by one of the major oil and gas companies in the Niger Delta. The tophole was planned to be drilled in two sections: a pilot hole to the planned section total depth and then with a hole opener to open the pilot hole to the required hole size. Due to the abrasive formation type and difficulties encountered while drilling to the planned depth, decision was made to set the casing shallower than planned. This necessitated drilling the 12-1/4" hole section longer than planned. With this decision, several challenges were encountered and eventually overcome. The well was successfully completed. The objective of this paper is to present the lessons learned in drilling a long open hole interval and the recovery operations from a stuck pipe incident within that interval in the well. It discusses both the well design and actual field practices, with significant emphasis in the recovery operations from the stuck pipe incident. One of the key events is the spotting of special pipe freeing pills, which in combination of other activities led to the freeing of the stuck bottom hole assembly which had a radioactive source. Some of the key learnings are the need to optimise the well design, proper hole cleaning and mud conditioning prior to drilling to section total depth. The knowledge of the pipe sticking mechanism and the application of the right pipe freeing formulations are important considerations in freeing any stuck pipe |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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