Browsing SINTEF Open by Author "Vrålstad, Torbjørn"
Now showing items 1-5 of 5
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Digital Cement Integrity: A Methodology for 3D Visualization of Cracks and Microannuli in Well Cement
Vrålstad, Torbjørn; Skorpa, Ragnhild (Peer reviewed; Journal article, 2020)Leakages of greenhouse gases, such as methane and carbon dioxide from wells, may have considerable environmental consequences. Although much emphasis is currently put on understanding well barrier failures, and thus, ... -
Leakages Through Radial Cracks in Cement Sheaths: Effect of Geometry, Viscosity, and Aperture
Skorpa, Ragnhild; Vrålstad, Torbjørn (Peer reviewed; Journal article, 2022)Annular cement sheath is considered to be one of the most important barrier elements in the well, both during production and after well abandonment. It is however well-known that mechanical damage to the cement sheath might ... -
Numerical Modeling of Radial Fracturing of Cement Sheath Caused by Pressure Tests
Gheibi, Sohrab; Sangesland, Sigbjørn; Vrålstad, Torbjørn (Chapter; Peer reviewed, 2019)To achieve an acceptable level of zonal isolation, well integrity should be guaranteed in hydrocarbon production and geological CO2 sequestration. Well pressure test can cause different types of failures in the well system ... -
An optimization model for the planning of offshore plug and abandonment campaigns
Bakker, Steffen J.; Vrålstad, Torbjørn; Tomasgard, Asgeir (Peer reviewed; Journal article, 2019)Plug and abandonment (P&A) operations can be time-consuming and thus very costly, especially for subsea fields. P&A of subsea wells require dedicated vessels such as high cost semi-submersible drilling rigs or lower cost ... -
Simulation of fluid flow through real microannuli geometries
Corina, Anisa Noor; Skorpa, Ragnhild; Sangesland, Sigbjørn; Vrålstad, Torbjørn (Peer reviewed; Journal article, 2020)Debonding of well cement towards casing or rock, i.e. microannuli formation, is a typical failure mode of cement barriers. Consequently, such microannuli may act as leak paths during leakages of downhole fluids such as ...