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- W2034308943 abstract "Abstract This paper describes Shell U.K. Exploration and Production's (Shell Expro) approach to managing safety critical activities when bringing onshore underbalanced drilling techniques into an offshore North Sea environment. Prior to 1996 underbalanced drilling (UBD), including low or reduced head had never been carried out, offshore, in the North Sea. However, sound economic justification provided the impetus to introduce this technique and associated technology. There were many significant safety challenges that had to be addressed to demonstrate that the risks were within the limits of tolerability and as low as is reasonably practical (ALARP). The primary HS&E concerns related to: loss of containment (continuous pressure at surface), competence of personnel (UBD differs from conventional drilling operations) and safely designing, installing and operating the new technology required for offshore UBD activities. While UBD had been successfully carried out in many onshore environments it was recognised that this experience did not readily translate to an offshore North Sea environment. Consequently, much of the technique and technology had to be revisited to provide the project team with the necessary level of assurance required to confidently proceed with underbalanced operations. Since 1996, the Shell Expro UBD Project Team has successfully implemented underbalanced drilling; this paper illustrates some of the main HSE issues that need to be managed for UBD operations." @default.
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- W2034308943 date "2001-02-27" @default.
- W2034308943 modified "2023-09-23" @default.
- W2034308943 title "Safety Critical Learnings in Underbalanced Well Operations" @default.
- W2034308943 doi "https://doi.org/10.2118/67688-ms" @default.
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