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Keywords: tertiary clay
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Proceedings Papers

Paper presented at the SPE European Spring Meeting, May 16–18, 1972
Paper Number: SPE-3744-MS
... Abstract Problems encountered in drilling Tertiary clays and shales in the southern part of the Norwegian Continental Shelf and the mud system most frequently used in this area, are reviewed in this paper. Severe viscosity problems frequently arise while drilling the top 10,000 feet of hole...

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