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Moghadam, A. (author), Castelein, C.J.K. (author), ter Heege, J.H. (author), Orlic, B. (author)Presence of microannuli at the cement interfaces in wellbores could provide a path for fluid leakage. In this study, we combined experimental analysis and numerical modelling to assess microannuli development at casing–cement interfaces. Lab experiments were conducted using two-metre long samples consisting of a 7’’ casing cemented inside a rock...article 2022
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Orlic, B. (author), Moghadam, A. (author), Brunner, L. (author), van Unen, M. (author), Wójcicki, A. (author), Bobek, K. (author), van der Valk, K. (author), Wollenweber, J. (author)Well leakage risk is a key concern for the safety and economics of geological CO2 storage. Maintaining the integrity of annulus cement in the wellbore during the lifetime of well is of paramount importance. Cement properties and the stress state in cement at the downhole conditions are however uncertain and difficult, if at all possible, to...conference paper 2021
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Rol, M.A. (author), Battistel, F. (author), Malinowski, F.K. (author), Bultink, C.C. (author), Tarasinski, B.M. (author), Vollmer, R. (author), Haider, S.N. (author), Muthusubramanian, N. (author), Bruno, A. (author), Terhal, B.M. (author), Dicarlo, L. (author)Conditional-phase (cz) gates in transmons can be realized by flux pulsing computational states towards resonance with noncomputational ones. We present a 40 ns cz gate based on a bipolar flux pulse suppressing leakage (0.1%) by interference and approaching the speed limit set by exchange coupling. This pulse harnesses a built-in echo to enhance...article 2019
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Cremonese, L. (author), Weger, L.B. (author), Denier van der Gon, H.A.C. (author), Bartels, M. (author), Butler, T. (author)The shale gas debate has taken center stage over the past decade in many European countries due to its purported climate advantages over coal and the implications for domestic energy security. Nevertheless, shale gas production generates greenhouse gas and air pollutant emissions including carbon dioxide, methane, carbon monoxide, nitrogen...article 2019
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Wiese, B.U. (author), Fleury, M. (author), Basic, I. (author), Abdollahi, J. (author), Patrnogic, A. (author), Hofstee, C. (author), Carlsen, I.M. (author), Wollenweber, J. (author), Schmidt-Hattenberger, C. (author), Drysdale, R. (author), Karas, D. (author)A silica gel was applied in a porous gas reservoir, with the purpose of testing mitigation and remediation of CO 2 leakage from geological storage reservoirs. The gel has a high strength and a very low water-like viscosity, that extends its applicability to small pore diameters and low permeability media. The gel was prepared and applied on-site...article 2019
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Schout, G. (author), Griffioen, J. (author), Majid Hassanizadeh, S (author), Cardon de Lichtbuer, G. (author), Hartog, N. (author)Methane leakage caused by well integrity failure was assessed at 28 abandoned gas wells and 1 oil well in the Netherlands, which have been plugged, cut and buried to below the ground surface (≥3 mbgl). At each location, methane concentrations were thoroughly scanned at the surface. A static chamber setup was used to measure methane flow rates...article 2019
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van de Weijer, P. (author), Akkerman, H.B. (author), Bouten, P.C.P. (author), Panditha, P. (author), Klaassen, P.J.M. (author), Salem, A. (author)Side leakage experiments have been performed on the organic interlayer, so-called organic coating for planarization (OCP), in a hybrid thin-film encapsulation (TFE) stack based on two silicon nitride (SiN) barrier layers that was developed for organic light-emitting diodes (OLED). To measure the side leakage into OCP, a metallic Ca thin-film...article 2018
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Barros, E.G.D. (author), Leeuwenburgh, O. (author), Carpentier, S.F.A. (author), Wilschut, F. (author), Neele, F.P. (author)In this paper we address the challenge of efficient and reliable monitoring of subsurface CO2 storage operations for conformance verification purposes. In order to acquire a storage license, the operator has to demonstrate convincingly to the regulator that the operation of the site will conform to safety regulations, and that CO2 will remain...conference paper 2018
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Peters, T.A. (author), Carvalho, P.A. (author), van Wees, J.F. (author), Overbeek, J.P. (author), Sagvolden, E. (author), van Berkel, F.P.F. (author), Løvvik, O.M. (author), Bredesen, R. (author)The long-term operation of a ceramic-supported 5 μm-thick Pd membrane at 450 °C and 27 bar with a feed representing steam-methane-reforming conditions has been monitored over a period of 100 days. Subsequently, a thorough characterisation of the exposed membrane has been performed to investigate leakage behavior and microstructural changes to...article 2018
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Bortolameotti, R. (author), van Ede, T. (author), Caselli, M. (author), Everts, M.H. (author), Hartel, P. (author), Hofstede, R. (author), Jonker, W. (author), Peter, A. (author)We present DECANTeR, a system to detect anomalous outbound HTTP communication, which passively extracts fingerprints for each application running on a monitored host. The goal of our system is to detect unknown malware and backdoor communication indicated by unknown fingerprints extracted from a host's network traffic. We evaluate a prototype...conference paper 2017
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Mione, M.A. (author), Katsouras, I. (author), Creyghton, Y. (author), van Boekel, W. (author), Maas, J. (author), Gelinck, G. (author), Roozeboom, F. (author), Illiberi, A. (author)High permittivity (high-k) materials have received considerable attention as alternatives to SiO2 for CMOS and low-power flexible electronics applications. In this study, we have grown high-quality ZrO2 by using atmospheric-pressure plasma-enhanced spatial ALD (PE-sALD), which, compared to temporal ALD, offers higher effective deposition rates...article 2017
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Antropov, A. (author), Lavrov, A. (author), Orlic, B. (author)Cap-rock integrity is of paramount importance during injection and subsequent long-term storage of CO2 in the subsurface. Preexisting (natural) and man-induced fractures in the cap rock represent potential flow paths out of the storage formation. In this study, a first-order semi-analytical model of flow through a vertical fracture penetrating...conference paper 2017
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Wasch, L.J. (author), Wollenweber, J. (author), Neele, F. (author), Fleury, M. (author)In the unlikely case of CO2 leakage from a storage reservoir, it is desirable to close the leak efficiently and permanently. This could be done by injecting a reactive solution into the leak path, thereby immobilizing migrating CO2 by consuming the gas and forming solid reactants. With regard to permanent closure, it is important to consider...conference paper 2017
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Karas, D. (author), Demić, I. (author), Kultysheva, K. (author), Antropov, A. (author), Blagojević, M. (author), Neele, F. (author), Pluymaekers, M. (author), Orlić, B. (author)The Bečej field, discovered in 1951 by the Petroleum Industry of Serbia (NIS), is one of the largest natural CO2 fields in Europe. Uncontrolled migration of CO2 out of the main reservoir, leading to subsurface seepage and surface leakage, was caused by the Bč-5 well blowout in 1968. Remediation measures were deployed in 2007 to reduce and...conference paper 2016
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Bortolameotti, R. (author), Peter, A. (author), Everts, M.H. (author), Jonker, W. (author), Hartel, P. (author)We address the problem of determining what data has been leaked from a system after its recovery from a successful attack. This is a forensic process which is relevant to give a better understanding of the impact of a data breach, but more importantly it is becoming mandatory according to the recent developments of data breach notification laws....conference paper 2016
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Jolt Oostra, A. (author), Blom, P.W.M. (author), Michels, J.J. (author)Pinholes in the emitting layer of an organic light emitting diode (OLED), e.g. induced by particle contamination or processing flaws, lead to direct contact between the hole-injection layer (HIL) and the cathode. The resulting short circuits give rise to catastrophic device failure. We demonstrate that these short circuits can be effectively...article 2014
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van der Horst, M.P. (author), Kaminski, M.L. (author), Lepelaars, E.S.A.M. (author)Growing applications of high strength steels, which are more sensitive to fatigue, harsher operative environments, and increasing economic value of ship- And offshore structures, such as FPSOs and FLNGs, increase the need for asset integrity management systems. Presently, there are many nondestructive testing methods available. Magnetic methods...conference paper 2014
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Pyayt, A.L. (author), Kozionov, A.P. (author), Mokhov, I.I. (author), Lang, B. (author), Meijer, R.J. (author), Krzhizhanovskaya, V.V. (author), Sloot, P.M.A. (author)Detection of early warning signals for the imminent failure of large and complex engineered structures is a daunting challenge with many open research questions. In this paper we report on novel ways to perform Structural Health Monitoring (SHM) of flood protection systems (levees, earthen dikes and concrete dams) using sensor data. We present a...article 2014
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Erkin, Z. (author), Veugen, T. (author), Toft, T. (author), Lagendijk, R.L. (author)Clustering is a very important tool in data mining and is widely used in on-line services for medical, financial and social environments. The main goal in clustering is to create sets of similar objects in a data set. The data set to be used for clustering can be owned by a single entity, or in some cases, information from different databases is...article 2013
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van Bergen, F. (author), Krzystolik, P. (author), van Wageningen, N. (author), Pagnier, H. (author), Jura, B. (author), Skiba, J. (author), Winthaegen, P. (author), Kobiela, Z. (author), TNO Bouw en Ondergrond (author)A pilot site for CO2 storage in coal seams was set-up in the Upper Silesian Coal Basin in Poland in the scope of the RECOPOL project, funded by the European Commission. About 760 tons CO2 were injected into the reservoir from August 2004 to June 2005. Breakthrough of the injected CO2 was established, which resulted in the production of about 10%...article 2009
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