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If you are not joining the defence on location, you can join us at:

Zoom
https://aaudk.zoom.us/j/ 68997636571
Meeting ID: 689 9763 6571
Passcode: 534675

Thesis title

Risk-Informed Asset Integrity Management of Subsurface Management Oil and Gas Wells.

Summary of the thesis

The oil industry is challenged with reducing the high costs of operations and maintenance of sub-surface oil wells without compromising safety. The high cost is driven by the current operations and maintenance strategy faulted by inadequate accountability of the time- and space-dependent uncertainties associated with the damage, caused by scaling and corrosion degradations, of the wells’ tubings and uncertainties in inspection outputs. This PhD research presents a risk-based framework, formulated within Bayesian pre-posterior decision analysis and the structural reliability analysis method, for identifying cost-optimal strategy for operations and maintenance of the tubings accounting for these uncertainties. The framework formulation comprises of the probabilistic models for damage evolution; operations and maintenance cost models; and inspections models. It was established using a framework such that a rational and consistent operations and maintenance strategy can be achieved, such that expected total costs are minimized. This implies that significant cost savings in operations and maintenance of sub-surface wells is possible using the formulated framework.

Copy of thesis

For a copy of the thesis, please email inst.build.phd@build.aau.dk.