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Several field observations by cement bond logs (a technique used to detect substance behind casing) indicate progressive borehole closure in soft rock such as shale. This study considers the problem of progressive borehole closure in an elasto-viscoplastic rock mass. The behavior of the rock mass is...

A large part of the Earth’s remaining offshore oil and gas reserves are found in environmentally sensitive areas where (extraction) operations and discharges to the environment can have negative consequences for the ecosystem. The offshore oil and gas industry needs to adapt to this reality, and...

During and after the last ice age, several hundred meters of glaciomarine and marine sediments accumulated in Norwegian fjords. These deposits have subsequently emerged due to glacioisostatic rebound, and leaching of salts from the marine clay by groundwater has resulted in the development of...

Drilling of long oil wells introduces the challenge of long delay time before the pump pressure has been built up to its expected level. After pump-start in long wells the generated hydraulic friction pressure requires a transient period of several minutes, due to pressure wave attenuation, before...