RIASSUNTO
Unsolicited. This document was submitted to SPE (or its predecessor organization) for consideration for publication in one of its technical journals. While not published, this paper has been included in the eLibrary with the permission of and transfer of copyright from the author.
I. SUMMARY
During a 41 day workover operation, 1800ft (550m) of cement, resulting from a flash setting, were drilled out of 3 DP, part of the DP recovered and the well completed.
The drilling started with turbo driven 2-21/32"" diamond bits. With this combination 230ft (70m) were drilled in 6 days. The drilling ended with, apparently, more efficient, locally made, rotary driven tools.
This paper discusses the cement job which ended in the flash setting and attempts to explain the cause of the flash. It introduces the first attempts to salvage the node and highlights the tools used both to drill and fish out lost drilling assemblies. It concludes among other things that a certified laboratory test on on-site cement, water and additives is safest and that local design and construction should be encouraged.