The consequences of permafrost thaw resulting from increased surface temperatures during drilling and production, affect casing design in a number of ways.
Permafrost is a permanently frozen soil. Soil at temperatures below freezing point may or may not contain ice, depending upon pore fluid salinity, pore pressure, and soil type. Permafrost can be continuous from the surface or discontinuous with intermittent unfrozen zones.
The following practices are for permafrost well casing design. They directly influence casing setting depths (part of the preliminary design phase) and casing load determination. Casing capacity is assumed to . . .