Rock anchors, which can withstand substantial forces and are essential for securing the foundations of the built environment, can fail due to steel tensile failure, bond detachment, or rock mass fracturing through uplift. In this study, uplift failure of the rock mass surrounding rock anchors was...
With the increasing concern of greenhouse gases emitted from oil and gas wells, wellbore leakage has been a topic of interest lately. Previous research has shown that the annular cement used to complete the well and is a primary barrier of fluid migration can experience debonding to the casing...
Subsea tunnels are located deeply under sea. Therefore，they are more difficult in geological investigation，design，construction and operation than land tunnels. In the last 30 years rich experiences have been gained in Norway from constructing 40 subsea tunnels and the“Norwegian subsea tunnelling...
We conducted an extensive study on the elastic properties of Opalinus Clay and the overlying and underlying rock formations, which range in the overall clay mineral content from nearly 0 wt.% to 60 wt.%. Our laboratory experiments focused on seismic and ultrasonic frequencies to determine the extent...
Creep, the time-dependent deformation of rock, has a promising application in petroleum engineering, as it may contribute to establish a physical barrier preventing leakage from the reservoir through the casing annulus. The contact between the rock and the casing is the first step to establish such...
This paper presents the latest developments in the project Next Generation Subsea Inspection, Maintenance and Repair (IMR). Subsea IMR operations are frequently carried out in the offshore oil and gas business. Increased efficiency in such operations will reduce time of operations and costs...
A Derivative-Free Trust-Region (DFTR) algorithm is proposed to solve the robust well control optimization problem under geological uncertainty. Derivative-Free (DF) methods are often a practical alternative when gradients are not available or are unreliable due to cost function discontinuities, e.g...