Blar i Institutt for geovitenskap og petroleum på dokumenttype "Chapter"
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A dynamic stress state analysis at the pressure tunnel of Upper Tamakoshi HPP, Nepal
(Chapter, 2018)In theory, in-situ stress state of an area of concern is mainly governed by gravity-induced stress, tectonic ac-tivity and topographic condition of that area. The tectonic and geological environment such as faulting and ... -
A new approach to dynamic barite sag analysis on typical Field oil-based drilling fluid
(Chapter, 2019)Laboratory and field experiences record that sagging of weighting agents such as barite in drilling fluids is often worse in dynamic conditions, e.g. pumping, tripping or drill pipe rotation, than in static conditions. ... -
An Approach to Limit Fully ConcreteLined Length of Pressure Tunnel for the Hydropower Projects to be built in the Himalaya
(Chapter, 2014)The use of underground space such as waterway tunnels, shafts, underground caverns are inevitable in the development of hydropower projects in the Himalaya. Finding innovative solutions in underground construction is ... -
Analysis on the pre-injection grout consumption at Strindheim Road Tunnel Project, Trondheim, Norway
(Chapter, 2014)The improvement of road quality by introducing a road tunnel is one of the principles used in both urban areas and other major highway system in Norway. In general, due to good quality rocks, the tun-nels constructed here ... -
Application of a Bingham viscoplastic model to borehole closure: comparison between two numerical approaches
(Chapter, 2019)ABSTRACT: 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 ... -
Application of glucolipid bola-amphiboles biosurfactant in mineral processing
(Chapter, 2021)Yeast-derived amphiboles have attracted considerable attention for their applications in various industrial sectors. However, only a few studies on this class of surfactant have been reported to be relevant to mineral ... -
Are All the Frames Equally Important?
(Chapter, 2020)In this work, we address the problem of measuring and predicting temporal video saliency - a metric which defines the importance of a video frame for human attention. Unlike the conventional spatial saliency which defines ... -
Artificial Intelligence for Well Integrity Monitoring Based on EM Data
(Chapter, 2021)Monitoring of integrity of plugged and abandoned (P&A'ed) wells is of interest for the oil and gas industry and for CO2 storage. The purpose of this study is to develop artificial intelligence (AI)-based approaches to ... -
Assessment on stress induced instability in a tunnel project of the Himalaya
(Chapter, 2011)In the Himalaya, the majority of long tunnels face severe tunnel instability problems. One of the major instability is related to rock stresses. The headrace tunnel of Parbati II hydroelectric project is one of the long ... -
Assessment on the in-situ rock stress condition along an unlined pressure tunnel/shaft of a Norwegian Hydropower Project using numerical modeling
(Chapter, 2023)Confinement is a pre-requisite in the “Norwegian state-of-art design principles” for unlined pressure tunnels/shafts where the minimum principal stress must exceed internal water pressure. Reliable estimation of in-situ ... -
AUTOMATED PATTERN RECOGNITION IN REAL-TIME DRILLING DATA FOR EARLY KARST DETECTION
(Chapter, 2021)Drilling in carbonate formations often poses a real challenge to operators, contractors and service companies. Severe fluid losses, gas kicks and other unwanted situations increase drilling risks. These risks are closely ... -
Can heating-induced creep result in shale barriers for P&A applications?
(Chapter, 2017)It has been shown that some shale formations form barriers around a casing of a well due to shale creep that results in closure and sealing of the annulus around the casing. The existence of such shale barriers facilitates ... -
Carbon Dioxide Saturation Estimates at Sleipner Using Seismic Imaging and Rock Physics Inversion
(Chapter; Peer reviewed, 2017)We present an integrated approach combining Full-Waveform Inversion and rock physics inversion to estimate CO2 saturation at Sleipner. Acoustic FWI provides high-resolution P-wave velocity images where the uncertainty is ... -
Case study of crosshole GPR tomography for grouting distribution in rock fractures
(Chapter, 2018)The Nordic method for tunnelling consists of drill and blast, pre-grouting and rock support adapted to the geologic conditions. Extensive use of pre-grouting is normally applied to limit water leakage. The injection is ... -
Challenges associated with the construction of vertical and inclined shafts in the Himalayan Region
(Chapter, 2023)In the Nepal Himalayas, hydropower projects having an installed capacity of over 10MW usually consist of underground waterways. Most of these underground waterways consist of vertical or inclined pressure shafts, which are ... -
Comparison of practice for aggregate use in road construction — results from an international survey
(Chapter, 2017)Conventional flexible pavement structures are constructed using aggregates, in a combination of unbound and bitumen bound materials. Crushed rock aggregates are fundamental for road construction in many countries. This ... -
Conceptual models for rock burst and energy transformations in strain burst
(Chapter, 2020)The occurrence of a rock burst event depends on two requisites: the secondary stresses after rock excavation must be beyond the rock strength and there are excessive energy releases from the rock mass in addition to the ... -
Contribution of Rock Physics Laboratory Tests and Modelling to Improving Uplift Estimates
(Chapter, 2018)Most currently applied procedures for uplift estimation rely on assumptions that porosity and seismic / log measured velocity are unaltered by the uplift process. Laboratory experiments have been performed with synthetic ... -
Cyclic oedometer swelling tests on rocks from North-Central Luzon, Philippines
(Chapter, 2020)Tunnels passing through swelling rocks are subjected to stability problems as moisture changes affect the material properties of the rocks. The drying out process during construction may cause local contraction stresses ...