Blar i Institutt for geovitenskap og petroleum på forfatter "Ofei, Titus Ntow"
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A new approach to dynamic barite sag analysis on typical Field oil-based drilling fluid
Ofei, Titus Ntow; Lund, Bjørnar; Saasen, Arild; Sangesland, Sigbjørn; Gyland, Knud Richard; Linga, Harald (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. ... -
Effect of Barite on the Rheological Properties of an Oil-Based Drilling Fluid
Ofei, Titus Ntow; Lund, Bjørnar; Gyland, Knud Richard; Saasen, Arild (Peer reviewed; Journal article, 2020) -
Effect of drill pipe orbital motion on non-Newtonian fluid flow in an eccentric wellbore: a study with computational fluid dynamics
Ferroudji, Hicham; Hadjadj, Ahmed; Ofei, Titus Ntow; Gajbhiye, Rahul Narayanrao; Rahman, Mohammad Azizur; Qureshi, M. Fahed (Peer reviewed; Journal article, 2021)To ensure an effective drilling operation of an explored well, the associated hydraulics program should be established carefully based on the correct prediction of a drilling fluid’s pressure drop and velocity field. For ... -
Laboratory Evaluation of Static and Dynamic Sag in Oil-Based Drilling Fluids
Ofei, Titus Ntow; Kalaga, Dinesh V.; Lund, Bjørnar; Saasen, Arild; Linga, Harald; Sangesland, Sigbjørn; Gyland, Knud Richard; Kawaji, Masahiro (Journal article; Peer reviewed, 2020)In this paper, we present the results of barite sag measurements before and after hot-rolled oil-based drilling fluids (OBDFs) using different approaches for characterization. We characterized the barite sag of a liquid ... -
Leak Detection in Gas Mixture Pipelines under Transient Conditions Using Hammerstein Model and Adaptive Thresholds
Mujtaba, Syed Muhammad; Lemma, Tamiru Alemu; Taqvi, Syed Ali Ammar; Ofei, Titus Ntow; Vandrangi, Seshu Kumar (Journal article, 2020)Conventional leak detection techniques require improvements to detect small leakage (<10%) in gas mixture pipelines under transient conditions. The current study is aimed to detect leakage in gas mixture pipelines under ... -
On the Stability of Oil-Based Drilling Fluid: Effect of Oil-Water Ratio
Ofei, Titus Ntow; Cheng, Itung; Lund, Bjørnar; Saasen, Arild; Sangesland, Sigbjørn (Chapter, 2020)Drilling fluids are complex mixtures of natural and synthetic chemical compounds used to cool and lubricate the drill bit, clean the wellbore, carry drilled cuttings to the surface, control formation pressure, and improve ...