String Weight Analysis

Marvin F. Glotfelty, RG, shares two string weight analysis examples from 2003. From them, Glotfelty shows that adding filter pack sand increase the string weight by tens of thousands of pounds in some cases and swabbing that filter pack to settle it further increases that string weight. Glotfelty also concludes that if there are multiple screened intervals, the uppermost filter pack intervals will have less impact than the lower one, and bentonite and cement annular seals both apply buoyancy effect that seem to relieve these stresses. It’s important to consider these conclusions when designing, constructing, and operating a well.

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