A Risk Based Approach for Calculating Barrier Lengths

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At shallower depths, the pressure and temperature conditions will be less severe, while the cement

will typically be of lower quality. To compare these conditions to the reference case, cement samples

from the shallower depths are tested to get realistic permeability data, and the corresponding

leakage rates compared to the UAC. In the studied case, it was seen through leakage modeling that

one could reduce the length requirements compared to the 2 x 30 meters defined by NORSOK D-010

(verified annular cement). The presented risk based methodology has a more scientific foundation

and combines testing of leakage through cement with theoretical models for leakage. This approach

can be used for dispensation request, or to discover and mitigate

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