Blar i NTNU Open på forfatter "Hovda, Sigve"
-
Estimation of cuttings concentration during drilling using experimental data - a hybrid computational intelligence modeling approach
Chowdhury, Dipankar (Doctoral theses at NTNU;2024:58, Doctoral thesis, 2024)Poor hole cleaning can be quite costly as it can lead to different operational problems such as mechanical stuck pipe, premature bit wear, slow drilling progress, formation fracturing, excessive drillstring torque and drag ... -
Experimental Verification of Optimal Tripping Curve
Zandtafreshi, Faraz (Master thesis, 2021)To dynamiske semianalytiske modeller ble foresl˚att av Hovda 2019 for ˚a minimere aksiale vibrasjoner involvert i en boreoperasjon. En for n˚ar borkronen er p˚a bunnen og en for n˚ar borkronen er over bunnen. Sistnevnte ... -
Gibbs-like phenomenon inherent in a lumped element model of a rod
Hovda, Sigve (Journal article; Peer reviewed, 2017)The underlying assumption of a lumped element model is that a spatially distributed physical system can be approximated by a topology of discrete entities. The impact of this assumption is illustrated by a model of a ... -
Hole cleaning efficiency of sweeping pills in horizontal wells
Faugstad, Anne Marte (Master thesis, 2019)Dårlig hullrensing er årsaken bak mange alvorlige boreproblemer som utfordrer planlagt operasjonstid og budsjettramme for både vertikale og horisontale brønner. Vanlig praksis er å bruke såkalte sweeping pills som rensemiddel ... -
Inducing Latereal Drillstring Movements to Improve Hole Cleaning
Sandahl, Bård Torarin (Master thesis, 2020)Borestrengsrotasjon er en velkjent måte å forbedre hullrensing i høyavviksbrønner. I denne oppgaven undersøkes hullrensingseffekten av heisesysteminduserte laterale borestrengbevegelser både for seg selv, og i kombinasjon ... -
Instrumentational Challenges in Surge and Swab Experiments
Aastveit, Sandra Bones (Master thesis, 2022)Denne oppgaven består av to deler. Hoveddelen er relatert til undersøkelser og verifisering av posisjons sensorene og datainnsamlingsprosessen for å finne årsaken til den store tidsforskjellen mellom motoren og bunn sensoren. ... -
Kick detection using downhole weight measurements
Cheru, Alberto Joseph (Master thesis, 2017)Early kick detection while drilling is a great concern in the oil and gas industry. Many kick detection methods have been developed some of which could reveal the occurrence of kicks as earlier as possible to avoid danger ... -
Model for evaluating drilling efficiency based on the concept of Mechanical Specific Energy
Tveit, Øyvind Sæther; Berg, Paal Vegar (Master thesis, 2016)Systems to increase efficiency during drilling is desirable in order to have more costeffective well operations. This master s thesis studies the possibility to present new information real-time regarding the actual drilling ... -
Multi-dimensional semi-analytical model for axial stick?slip of a rod sliding on a surface with Coulomb friction
Hovda, Sigve (Journal article; Peer reviewed, 2019)A multi-dimensional lumped element model of a long non-rotating rod that moves on a slick surface with both dynamic and static Coulomb friction is outlined. The rod is accelerated to a constant velocity, and the free end ... -
New Doppler-Based Imaging Methods in Echocardiography with Applications in Blood/Tissue Segmentation
Hovda, Sigve (Doktoravhandlinger ved NTNU, 1503-8181; 2007:93, Doctoral thesis, 2007)Part 1: The bandwidth of the ultrasound Doppler signal is proposed as a classification function of blood and tissue signal in transthoracial echocardiography of the left ventricle. The new echocardiographic mode, Bandwidth ... -
Prediction of Surge and Swab from Field Data Compared with Existing Theory - Analysis of Two Wells in the North Sea
Tveit, Alfhild (Master thesis, 2016)Existing theory of surge and swab are compared with field data. The purpose of this master thesis is to examine whether or not existing methods can be used for calculations of surge and swab pressure. Field data from two ... -
Real-Time Data-Driven Drilling Optimization
Nystad, Magnus (Doctoral theses at NTNU;2021;348, Doctoral thesis, 2021)Drilling a well for exploration or production of petroleum resources is a costly and complicated procedure. There is a great potential for cost reduction by drilling safer, faster and with less Non-Productive Time (NPT). ... -
Relief Well Killing In Shallow Reservoirs
Thoresen, Daniel (Master thesis, 2015)After the "Wisting"-discovery was made in the Barents sea, operators are likely to be more aware of the potential in shallower formations when planning exploration wells. With the possible development of more shallow ... -
Review of a Semi-Analytical Drillstring Model Through Experimental Testing of Axial Motion - Amplification and Time Delay in Air and Water
Tobro, Halvor Lunde (Master thesis, 2018)Prediction of downhole movement is key to foresee surge and swab fluctuations, and the ability to maintain pressure within the boundaries of the operational window. Especially during connections, the movement of the structure ... -
Rheological characterization of Polyanionic Cellulose solutions with application to drilling fluids and cuttings transport modeling
Busch, Alexander; Myrseth, Velaug; Khatibi, Milad; Skjetne, Paal; Hovda, Sigve; Johansen, Stein Tore (Journal article; Peer reviewed, 2018)In petroleum drilling, aqueous Polyanionic Cellulose solutions (PAC) are often used as a drilling fluid model system in experimental laboratory studies to investigate cuttings transport. Cuttings transport refers to the ... -
Scalable Infrastructure for Surge and Swab Experiments
Sørgård, Christoffer Schjem (Master thesis, 2020)Nøyaktig prediksjon av nedihulls trykk variasjon er av høy interesse da mer komplekse brønner blir boret innenfor depleterte reservoarer og med smalere operasjonelle trykk vindu. Variasjonen betegnet surge og swab er en ... -
The effect of cuttings on annular pressure loss - An analysis of field data in the North Sea
Wold, Andreas Anderssønn; Kummen, Håvard Tarjei (Master thesis, 2015)This master's thesis studies the correlation between rapid alterations in cuttings concentration and the corresponding change in pressure loss, using the standpipe pressure as pressure indicator. Drilling data from two ...