Browsing NTNU Open by Author "Lavrov, Alexandre"

Can Heating Induce Borehole Closure?

Xie, Xiyang; Bauer, Andreas; Stenebråten, Jørn; Bakheim, Sigurd; Lavrov, Alexandre; Fjær, Erling; Kristiansen, Tron Golder (Peer reviewed; Journal article, 2020)

The current study shows that heating a cased borehole in low-permeability shale rock can induce plastic deformation, leading to the closure of the casing annulus and decreasing annulus connectivity. The thermally induced ...

Development of an automation method to conduct sensitivity analysis on weakness zones using Finite Element Modelling - with focus on total deformations

Kaasbøll Andresen, Eirik (Master thesis, 2022)

I områder med harde bergarter, tilsvarende det Norske geologiske landskapet, er svakhetssoner en av de viktigste årsakene til stabilitetsrelaterte problemstillinger møtt i tunnelindustrien. Det er derfor nødvendig å få ...

Effect of electric field on push-out strength of cemented steel pipes

Lavrov, Alexandre; Werner, Benjamin; Stroisz, Anna Magdalena; Øia, Thomas Monge; Gawel, Kamila; Torsæter, Malin; Jafariesfad, Narjes (Peer reviewed; Journal article, 2021)

Cement-steel interfacial strength is an important measure for estimating the robustness and hydraulic sealing ability of wells. In this paper, laboratory experiments were performed in which small steel pipes (10 mm in ...

Flow of non-Newtonian fluids in single fractures and fracture networks: Current status, challenges, and knowledge gaps

Lavrov, Alexandre (Peer reviewed; Journal article, 2023)

Flow of non-Newtonian fluids in rock fractures is ubiquitous in engineering practice and involves e.g. cement flow in tunnel grouting, drilling fluid flow when a fracture is met during drilling, and flow of fracturing ...

Fluid Displacement in a 2D DFN Fracture: Time Integration of the Interface Position

Lavrov, Alexandre (Journal article; Peer reviewed, 2021)

Geomechanical modelling of subsidence and induced seismicity in a gas reservoir

Kartveit, Kyrre Heldal (Master thesis, 2015)

Reservoir compaction and associated surface subsidence, fault reactivation and induced earthquakes are observed in many petroleum fields worldwide. A better understanding of the geomechanical behaviour of reservoir rocks ...

Hydraulic Fracturing for Enhanced Geothermal Systems

Rongved, Mats (Master thesis, 2015)

Finding new energy sources to provide base load electricity supply on a global scale is of increasing importance. Enhanced Geothermal Systems (EGS) has been identified as capable of playing an important role in the future ...

Impact of Faults and Fractures in Geomechanics of Reservoir Pressurization: A Numerical Approach

Gheibi, Sohrab (Doctoral theses;2018:51, Doctoral thesis, 2018)

The importance of geomechanical modeling has risen due to the increase in the concerns about the possible seismic activities and leakage problems due to the reactivation of faults/fracture in the reservoir-caprock system ...

Million node fracture: size matters?

Lavrov, Alexandre (Peer reviewed; Journal article, 2021)

Transmissivity of self-affine fractures was computed numerically as a function of the grid size. One-million-node fractures (1024 × 1024 nodes) with fractal dimensions of 2.2–2.6 were cut into successively smaller fractures ...

Numerical investigation of wellbore damage due to drill string lateral vibration

Haghgouei, Hadi; Nermoen, Anders; Lavrov, Alexandre (Journal article; Peer reviewed, 2024)

During drilling operations, cyclic loading is exerted on the wellbore wall by the vibrations of the drill string. This loading could lead to rock fatigue, which in turn might result in wellbore failure. In this study, a ...

Numerical modeling of direct shear tests of rock joints

Aas, Henrik (Master thesis, 2023)

Numerisk modellering spiller en stadig større rolle i felt innenfor ingeniørgeologi. For modelleringens bruk i forskning knyttet til konkrete aspekter for bergmekanikk, er sprekkdeformasjon når utsatt for normal- og ...

Numerical modelling of Bingham fluid flow and particle transport in a rough-walled fracture

Hanssen, Alexander Rikstad (Master thesis, 2013)

Drilling operations may encounter mud loss which becomes especially aggravated in naturally fractured formations. The dynamics of fluid loss is a complex process, affected by both the rheology and the composition of the ...

Numerical modelling of crack initiation and propagation in rocks using the XFEM

Dolvik, Kristoffer Aurstad (Master thesis, 2022)

Denne masteroppgaven fokuserer på numerisk modellering av sprekkevekst i et bergartslignende materiale under enaksielt trykk ved å bruke den utvidete endelige element metoden (XFEM). Todimensjonale prøvestykker som inneholder ...

Numerical Modelling of the Stress Field and Failure Behaviour of Grouted Rocks

Nilsen, Eldbjørg Stenrud (Master thesis, 2021)

Denne masteroppgaven undersøkte den forsterkende effekten fra injeksjon av bergprøvestykker som inneholder åpne sprekker av varierende lengde og fallvinkel, gjennom numerisk modellering. Til dette formålet ble to- og ...

Numerical Simulation of Fracture Geomechanics: Geothermal, CCS and Petroleum applications

Rongved, Mats (Doctoral theses at NTNU;2019:370, Doctoral thesis, 2019)

Physics of Strain Burst in Hard Rock – Fracture characteristics and influences of the stiffness of the host rock mass

Wan, Wenkai (Doctoral theses at NTNU;2022:242, Doctoral thesis, 2022)

Rock burst is a phenomenon in which rock disintegrates, accompanied by the ejection of debris. Strain burst is a type of rock burst. It is directly associated with stress concentration after rock excavation. Overstressed ...

Precision calculation of the entrance length for laminar flow of Bingham fluid between parallel plates with yield number from 0 to 1000

Lavrov, Alexandre (Journal article; Peer reviewed, 2024)

An estimate of the entrance length for a Bingham fluid flowing between parallel plates is needed in engineering applications. The dimensionless entrance length is a function of yield number. The primary objective of this ...