Blar i Department of Energy and Petroleum Engineering (TN-IEP) på tidsskrift "Journal of Petroleum Science and Engineering"
Viser treff 1-20 av 25
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A decision support system for multi-target geosteering
(Journal article; Peer reviewed, 2019-12)Geosteering is a sequential decision process under uncertainty. The goal of geosteering is to maximize the expected value of the well, which should be defined by an objective value-function for each operation. In this paper ... -
Alternative setting materials for primary cementing and zonal isolation – Laboratory evaluation of rheological and mechanical properties
(Peer reviewed; Journal article, 2021)Portland cement is the prime zonal isolation material used in hydrocarbon wells and its utilization has been extended to geothermal, carbon sequestration and gas storage wells. Despite the vast quantity of research activities ... -
Analytical solutions for forced and spontaneous imbibition accounting for viscous coupling
(Journal article; Peer reviewed, 2019-11-22)Fluid-fluid momentum transfer can cause higher flow resistance when fluids flow in opposite directions as compared to the same direction. Conventional modelling of flow in porous media using simple, saturation dependent relative ... -
Application of non-parametric statistical methods to predict pumpability of geopolymers for well cementing
(Peer reviewed; Journal article, 2022)As a potential alternative to Portland cement, geopolymers are getting wider acceptance in the scientific world. On a laboratory scale, the latter is being experimented repeatedly to extract valuable and valid results. To ... -
Cement properties characterization from a section retrieved from an oil production well after 33 years of downhole exposure
(Peer reviewed; Journal article, 2021)A unique data set has been constructed based on the study of class G cement recovered from an oil well on the Norwegian continental shelf. The cement was placed between two casing sections and submitted to downhole conditions ... -
Closed-loop well construction optimization (CLWCO) using stochastic approach under time uncertainty
(Peer reviewed; Journal article, 2021)There is a digital step change taking place in well construction today. More and better data will become available for a vast number of analyses. The well construction process is complicated and includes several hundred ... -
Data-driven sensitivity analysis of complex machine learning models: A case study of directional drilling
(Peer reviewed; Journal article, 2020-12)Classical sensitivity analysis of machine learning regression models is a topic sparse in literature. Most of data-driven models are complex black boxes with limited potential of extracting mathematical understanding of ... -
Effects of confinement pressure on the mechanical behavior of an oil well cement paste
(Peer reviewed; Journal article, 2021-11)Oil well cement paste is a key structural component in wells that should provide mechanical support to the casing and prevent uncontrolled flow of formation fluids along the wellbore and to the environment. Since the annular ... -
The fate of hydrocarbon leaks from plugged and abandoned wells by means of natural seepages
(Peer reviewed; Journal article, 2020-10)When a well reaches the end of its productive life, it is permanently plugged and abandoned. Even though new technology and verification methods are being evaluated, it is evident that operational, barrier material and ... -
Hole cleaning and wet-granular rheology of rock cutting beds: Impact of drilling fluid composition
(Peer reviewed; Journal article, 2022)Cuttings-beds formation is an issue that must be considered during all wellbore drilling operations. This problem increases at highly deviated or horizontal wells, where cuttings removal efficiency becomes one of the most ... -
Impact of data pre-processing techniques on recurrent neural network performance in context of real-time drilling logs in an automated prediction framework
(Peer reviewed; Journal article, 2021-11)Recurrent neural networks (RNN), which are able to capture temporal natures of a signal, are becoming more common in machine learning applied to petroleum engineering, particularly drilling. With this technology come ... -
Influence of low-frequency oscillatory motion on particle settling in Newtonian and shear-thinning non-Newtonian fluids
(Peer reviewed; Journal article, 2021-01)An experimental study is performed to observe the effect of vertical fluid oscillations on the mean settling velocity of single spherical glass particles released into mixtures of water and polymeric fluids which exhibit ... -
Invasion of CaCO3 particles and polymers into porous formations in presence of fibres
(Peer reviewed; Journal article, 2022)Formation damage can occur through migration of drilling fluid particles and polymers into porous formations. A methodology for assessing formation damage was applied to measure invasion of CaCO3 and polymers into porous ... -
Measuring filter-cake cohesive strength and flowability
(Peer reviewed; Journal article, 2022)The filter-cake has a critical role in temporarily reducing the permeability of the wellbore to prevent issues such as lost circulation, formation damage, wellbore collapse and differential sticking. The filter-cake's ... -
A method for assessing drilling fluid induced formation damage in permeable formations using ceramic discs
(Peer reviewed; Journal article, 2022)When drilling an oil and gas or geothermal well, the formation's ability to produce or flow may be reduced because of exposure to the drilling fluid during the drilling operation. To evaluate such formation damage, core ... -
Numerical Investigation of Non-Darcy Flow Regime Transitions in Shale Gas Production
(Peer reviewed; Journal article, 2020-07)Shale gas reservoirs are organic rich formations with often ultra-low permeability. Gas is stored in free and adsorbed form. Conventional Darcy flow cannot fully describe the gas transport in such porous media. It is thus ... -
Plug & abandonment of offshore wells: Ensuring long-term well integrity and cost-efficiency
(Peer reviewed; Journal article, 2019-10)There is an upcoming "P&A wave" of wells that need to be permanently plugged and abandoned, especially in mature, offshore areas such as the North Sea and Gulf of Mexico. It is important to ensure that plugged wells do not ... -
Reference Dataset for Rate of Penetration Benchmarking
(Peer reviewed; Journal article, 2020-10)In recent years, there were multiple papers published related to rate of penetration prediction using machine learning vastly outperforming analytical methods. There are models proposed reportedly achieving R2 values as ... -
Reproducing wettability in sandstone reservoir core material in laboratory core restorations
(Peer reviewed; Journal article, 2021-09)Replicating initial reservoir wettability conditions in core restoration by core cleaning and fluid restoration in the laboratory is of great importance. There are several core cleaning and restoration protocols used in ... -
Restoration of annular zonal isolation using localized casing expansion (LCE) technology: Treatment of near-horizontal test sections containing a free-water channel
(Peer reviewed; Journal article, 2021-11)Fluid migration behind casings is a well integrity problem that can result in sustained casing pressure, undetected leaks to the environment, and potentially very difficult remediation attempts. Traditional methods for ...