Blar i Vitenskapelige publikasjoner (TN-IEP) på forfatter "Agonafir, Mesfin Belayneh"
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Bridging performances of lost circulation materials (LC-LUBE and mica) and their blending in 80/20 and 60/40 oil-based drilling fluids
Agonafir, Mesfin Belayneh; Aadnøy, Bernt Sigve (Peer reviewed; Journal article, 2022)In drilling wells, lost circulation, barite sagging, shale swelling, and formation damage are critical problems for the industry. These problems can be controlled by designing appropriate drilling fluids and lost circulation ... -
Effect of Iron Oxide Nanoparticles on the Properties of Water-Based Drilling Fluids
Alvi, Muhammad Awais Ashfaq; Agonafir, Mesfin Belayneh; Bandyopadhyay, Sulalit; Minde, Mona Wetrhus (Peer reviewed; Journal article, 2020-12)In recent years, several studies have indicated the impact of nanoparticles (NPs) on various properties (such as viscosity and fluid loss) of conventional drilling fluids. Our previous study with commercial iron oxide NPs ... -
MoS2 Nanoparticle Effects on 80°C Thermally Stable Water-Based Drilling Fluid
Agonafir, Mesfin Belayneh; Aadnøy, Bernt Sigve; Strømø, Simen Moe (Peer reviewed; Journal article, 2021-11)Bentonite-based drilling fluids are used for drilling, where inhibitive fluids are not required. The rheological and the density properties of the drilling fluids are highly affected by high temperature and pressure. Due ... -
New Simple Analytical Surge/Swab Pressure Model for Power-Law and Modified Yield-Power-Law Fluid in Concentric/Eccentric Geometry
Mohammad, Amir; Agonafir, Mesfin Belayneh (Peer reviewed; Journal article, 2023)The axial movement of pipe in and out of the well generates positive (surge) and negative (swab) pressures that will impact the well pressure. When the swab and surge effects cause well pressures outside the allowable ... -
Physics-Based Swab and Surge Simulations and the Machine Learning Modeling of Field Telemetry Swab Datasets
Mohammad, Amir; Agonafir, Mesfin Belayneh; Davidrajuh, Reggie (Peer reviewed; Journal article, 2023)Drilling operations are the major cost factor for the oil industry. Appropriately designed operations are essential for successful drilling. Optimized drilling operations also enhance drilling performance and reduce drilling ... -
Pressure Build-Up in Closed Wells During Kick Migration and Fluid Compressibility Effects
Agonafir, Mesfin Belayneh; Petersen, Johnny; Fjelde, Kjell Kåre (Chapter, 2022)If a kick is migrating in a closed well, this will lead to pressures building up in the well. It has earlier been shown that for Non-Newtonian fluids, suspension effects will make it impossible to deduce a unique gas ...